US20040187444A1

US20040187444A1 - Process for the manufacture and filling of flexible pouches

Info

Publication number: US20040187444A1
Application number: US10/747,812
Authority: US
Inventors: Gerald Hutchinson; Robert Lee
Original assignee: Advanced Plastics Technologies Ltd
Current assignee: Advanced Plastics Technologies Luxembourg SA
Priority date: 2002-12-27
Filing date: 2003-12-29
Publication date: 2004-09-30
Also published as: WO2004060748A1; MXPA05006893A; AU2003300415A1; JP2006512258A; ATE399711T1; BR0317776A; CA2511795A1; ES2310689T3; EP1594742A1; EP1594742B1; DE60321968D1

Abstract

Disclosed are flexible pouches including a process for manufacturing said pouches from preforms. Also disclosed is a process for manufacturing and filling said pouches wherein the preform/pouch is handled via the neck portion throughout the production line. In one embodiment, the filled pouch is further dressed, decorated, or inserted into a rigid outer container, for example a box. In a preferred embodiment, the production line is a modified version of the type commonly used for handling rigid containers, such as those used to manufacture and fill soft drinks.

Description

RELATED APPLICATION DATA

This application claims priority under 35 U.S.C. 119(e) from provisional applications Serial Nos. 60/437,026 and 60/437,160 both filed Dec. 27, 2002, the entireties of which are hereby incorporated by reference.[0001]

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a process for the manufacture and filling of flexible pouches, wherein said pouches have one or more layers. More particularly, in multilayer pouches the layers are directly adhered to each other and are highly flexible yet strong such that they are suitable for various packaging applications. These pouches may be used as stand alone products or they may be used for lining containers.

2. Description of the Related Art

Currently, flexible pouches are used as disposable packaging for liquids, liquid beverages, and liquid foods. These pouches preferably meet a number of performance criteria, including collapsibility, optical clarity, transparency, and sufficient mechanical strength to withstand the rigors of the use environment. Flexible pouches preferably provide a sufficient barrier to the passage of moisture vapor and other gasses to prevent contamination of the items contained therein.

A multilayer film which is commonly used in flexible pouch applications is aluminum coated polyethylene or polypropylene. Other multilayer films are used such as those containing barrier polymers such as EVOH or MXD6 to prevent oxygen or carbon dioxide migration. Such film structures must be fabricated into pouches typically utilizing heat sealing/seam technology that is slow and difficult to fill. Delivery of the beverage contents can also be difficult with the required use of straws.

In certain applications, shipping boxes or other containers are often lined with a thin plastic liner to increase the shelf-life of foods or other perishable commodities, or to prevent leakage or spillage of product from a sealed shipping container. Such plastic liners are often in bag form. A number of methods and processes have been utilized to place the bag/liners into the box and then fill the bag. However, one major disadvantage of many of these processes are the slow filling speeds that can be accomplished.

SUMMARY OF THE INVENTION

What is therefore needed is a quick and reliable method and apparatus for manufacturing and filling flexible pouches. In one embodiment, there is provided a process for manufacturing and filling flexible pouches in a continuous production line. This process allows for an increase in the manufacturing and filling speeds, thereby greatly reducing the production costs, preferably such that the process is commercially viable. In a preferred embodiment, a continuous production line begins with a preform having a neck portion and a body such as may be used to make bottles. The preform is blow molded into a flexible pouch. The pouch is filled with the desired product, and then closed or capped for final use. In one embodiment, the filled pouch is further dressed, decorated and/or inserted into a rigid outer container, for example a box. In one embodiment, the production line is a modified version of the type commonly used for handling rigid containers, such as those used to manufacture and fill soft drinks, wherein the system is modified to handle the flexible pouches using the neck portion.

The pouch may be a monolayer or multilayer collapsible pouch having a neck finish. In a preferred embodiment the inner layer of the pouch comprises polyethylene terephthalate (“PET”) or polypropylene. In one embodiment, the polypropylene is preferably clarified polypropylene. In other embodiments, suitable inner layer materials include, but are not limited to, various polymers such as polyesters, polyolefins, including polypropylene and polyethylene, polycarbonate, polyamides, including nylons, or acrylics. These materials may be used alone or in conjunction with each other.

The PET of certain embodiments includes, but is not limited to, modified PET as well as PET blended with other materials. One example of a modified PET is “high IPA PET” or IPA-modified PET wherein the PET contains high IPA (isophthalic acid) levels to provide processing advantages such as reduced crystallinity. Other examples include, but are not limited to, high stretch PET, recycled high stretch PET, and recycled PET.

In other embodiments, suitable pouches will have one or more exterior layers comprising a materials including, but not limited to, polyethylene, polypropylene, modified polyolefins, modified elastomers, polystyrene, thermoplastic polyurethane, Copolyester Barrier Materials, Phenoxy-type Thermoplastics, polyamides, polyethylene naphthalate, polyethylene naphthalate copolymers, polyethylene naphthalate/polyethylene terephthalate blends, polyethylene terephthalate, compatibilized polymer blends, and combinations thereof. In another embodiment, exterior layers are provided as foamed layers utilizing either physical or chemical blowing agents.

In one embodiment, a multilayer pouch having a neck finish comprises (a) a first interior layer comprising polyethylene terephthalate; (b) a second exterior layer comprising one or more materials including, but not limited to, polyethylene, polypropylene, modified polyolefins, modified elastomers, polystyrene, thermoplastic polyurethane; wherein said pouch is fabricated by suitable blow molding operations of preforms. In another embodiment, exterior layers are provided as foamed layers utilizing either physical or chemical blowing agents. The pouch of preferred embodiments further comprises a bottle neck finish that can be filled in suitable filling lines at high outputs. The bottle neck finish of one embodiment is preferably threaded or crowned. In embodiments utilizing a crowned bottle neck finish, the crown type neck finish preferably is of the type capable of receiving a snap-on open/close fitment. In one embodiment, a preferred pouch may further comprise a “push-pull” or a non-spill fitment, or other suitable bottle closure.

In one embodiment, preforms having a neck finish suitable for blow molding into flexible pouches having a neck finish may be prepared by conventional methods known to those of skill in the art, including, but not limited to, overmolding, co-injection, and inject-over-inject methods. For example, the methods disclosed in U.S. Pat. No. 6,352,426, filed Apr. 21, 1999, U.S. Pat. No. 6,391,408, filed Oct. 19, 1998, U.S. Pat. No. 6,312,641, filed Oct. 17, 1997, U.S. patent application Ser. No. 10/090,471 filed Mar. 4, 2002, PCT publication WO03/080731 corresponding to U.S. patent application Ser. No. 10/395,899 filed Mar. 21, 2003, and U.S. patent application Ser. No. 10/614,731 filed Jul. 3, 2003, herein incorporated by reference in their entirety, may be used.

In one embodiment, a manufacturing and filling line comprises various modules or systems connected together using a conveyor/handler/transporter that holds the flexible pouches by the neck portion. Suitable systems include, but are not limited to, handling, manufacturing, and filling systems. In one embodiment an apparatus for making and filling flexible pouches comprises: (a) a handling system that conveys the flexible pouches through a manufacturing and filling system; (b) a manufacturing system comprising a preform with a neck finish; and a blow molding machine wherein said preform is blow molded into a flexible pouch having a neck finish; and (c) a filling system comprising a filling machine wherein said flexible pouch is filled with a desired product, and a closing or capping machine wherein said filled flexible pouch is closed; wherein the handling system conveys the preforms and flexible pouches throughout the entire system using the neck portion.

In another embodiment, a preferred manufacturing and filling line further comprises decorating, dressing, and/or inserting the pouch into a rigid container. The pouch may be dressed, decorated, and/or inserted into a rigid container before or after the pouch is filled.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 illustrates a non-limiting embodiment of a preferred production line. [0016]
FIG. 2 illustrates a non-limiting embodiment of a preferred preform.[0017]

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

As can be appreciated, a continual need exists in the art for flexible pouches having increased strength and flexibility, ease in filling, and a reliable delivery mechanism to prevent spillage. At the same time, such pouches must be able to provide other properties that may be necessary for the particular application, e.g., good optical properties, chemical neutrality, strength, rigidity, and resistance to leakage. There is also a need for a process which allows for high speed filling of flexible pouches that can be performed in an economical manner. [0018]
In one embodiment, there is disclosed a process for manufacturing and filling flexible pouches in a continuous production line. This process allows for an increase in the manufacturing and filling speeds, thereby greatly reducing the production costs rendering the process economically feasible. In a preferred embodiment, one continuous production line begins with a preform of the type commonly used to make bottles, the preform is then blow molded into a flexible pouch, the pouch is filled with the desired product, and then closed for final use. In one embodiment, the filled pouch is then further dressed, decorated and/or inserted into a rigid outer container, for example a box. In other embodiments, the pouch is placed into a rigid outer container prior to filling and/or dressed, decorated. In a preferred embodiment, the production line is a modified version of the type used for handling rigid containers, such as those used to manufacture and fill soft drinks. A preferred filling process is of the type known in the art for filling PET bottles. Such systems include, but are not limited to, aseptic, hot fill, or chilled filling lines. [0019]

A. Materials

1. Physical Characteristics of Preferred Pouches

One or more of the following advantages may be accorded by preferred embodiments. Lightweight pouches made from preforms that are blown on a stretch blow molding machine can be captured and held by the neck portion and directly transferred through each step of the manufacturing process. The pouches can be filled on current PET or glass filling lines with economic filling speed and little additional capital investment. Such filling lines can be designed to efficiently fill either conventional bottles or flexible pouches. This ability to capture the neck portion and transfer the flexible pouch throughout the filling and packaging process allows high speed handling of flexible pouches and significant reduction in manufacturing cost. Moreover, the neck finish of preferred embodiments avoids the need for expensive gable top materials known in the art for dispensing beverages. [0020]
Collapsibility is desirable to provide a more proper and complete drainage of the pouch. Unlike rigid liquid containers, which rely on air displacement for drainage, flexible pouches rely on collapsibility for drainage. As the pouch drains, atmospheric pressure collapses the pouch at a rate that is proportional to the rate of drainage. In this manner, the pouch can be fully drained. In order for the pouch to be collapsible, the pouch should have a flexible wall. If the wall is too stiff, the pouch will not drain fully. Thus, one consideration in the design of flexible pouches is that the wall structure preferably has sufficient flexibility and is collapsible enough to be fully drainable. [0021]
In certain embodiments, it is desirable to sterilize the flexible pouch, the pouch contents, or both the pouch and its contents prior to sending the filled pouch to the end user, e.g., a store or vending distributor. This helps to ensure that the pouch and its contents will be substantially free from contamination. Thus, another consideration of flexible pouches of certain embodiments is that the pouch preferably proceeds through the sterilization process without substantial deterioration. [0022]
Flexible pouches of preferred embodiments preferably have sufficient mechanical strength to withstand the abuse that is typically encountered in the use environment. Such environments include the filling lines, packaging and distribution systems, and end-user storage/transportation. The pouch preferably should be able to be used in these environments and under these conditions without substantial leakage, breakage, or spillage. [0023]
In embodiments wherein the flexible pouch is inserted into a rigid outer container, the pouch/rigid outer container system can be functionally optimized to provide various properties such as barrier against oxygen or CO[0024] ₂and hot fill properties.

2. Preform Details

In one embodiment, preforms suitable for blow molding into flexible pouches include, but are not limited to, monolayer or multilayer preforms including those that utilize barrier resins, oxygen scavengers, and antimicrobials. (see U.S. Pat. No. 6,352,426, filed Apr. 21, 1999, U.S. Pat. No. 6,391,408, filed Oct. 19, 1998, U.S. Pat. No. 6,312,641, filed Oct. 17, 1997, U.S. patent application Ser. No. 10/090,471 filed Mar. 4, 2002, PCT publication WO03/080731 corresponding to U.S. patent application Ser. No. 10/395,899 filed Mar. 21, 2003, and U.S. patent application Ser. No. 10/614,731 filed Jul. 3, 2003, the disclosures of which are incorporated herein in their entireties by this reference). [0025]
The pouch may be a monolayer or multilayer pouch. In a preferred embodiment the inner layer of the pouch comprises polyethylene terephthalate (“PET”) or polypropylene. In one embodiment, the polypropylene is preferably clarified polypropylene. In addition to other aspects, single or multi layer pouches manufactured from polypropylene may also be utilized with products requiring elevated fill temperature or “hot fill.” [0026]
The PET of certain embodiments includes, but is not limited to, modified PET, recycled PET as well as PET blended with other materials. One example of a modified PET is “high IPA PET” or IPA-modified PET wherein the PET contains high IPA (isophthalic acid) levels to provide processing advantages such as reduced crystallinity. Another example is high stretch PET, wherein the PET has been modified so as to enhance its stretching capabilities. [0027]
Although preferred embodiments are described in terms of polyethylene terephthalate (“PET”) or polypropylene, other suitable inner layer materials include, but are not limited to, various polymers such as polyesters, polyolefins, including polypropylene and polyethylene, polycarbonate, polyamides, including nylons, or acrylics. These materials may be used alone or in conjunction with each other. [0028]
In other embodiments, suitable pouches will have one or more exterior layers comprising one or more materials including, but not limited to, polyethylene, polypropylene, modified polyolefins, modified elastomers, polystyrene, thermoplastic polyurethane, Copolyester Barrier Materials, Phenoxy-type Thermoplastics, polyamides, polyethylene naphthalate, polyethylene naphthalate copolymers, polyethylene naphthalate/polyethylene terephthalate blends, polyethylene terephthalate, compatibilized polymer blends, and combinations thereof. In another embodiment, exterior layers are provided as foamed layers utilizing either physical or chemical blowing agents. Exterior layers may also comprise recycled materials. [0029]
“Phenoxy” resins, also referred to as “Phenoxy-type Thermoplastics,” as those terms are used herein, include a wide variety of materials including those discussed in WO 99/20462. A further subset of phenoxy resins, and thermoplastic epoxy resins, are preferred hydroxy-phenoxyether polymers, of which polyhydroxyaminoether copolymers (PHAE) is a further preferred material. For example, suitable PHAE resins include BLOX resins available from The Dow Chemical Company, Midland, Mich., USA. See for example, U.S. Pat. Nos. 6,455,116; 6,180,715; 6,011,111; 5,834,078; 5,814,373; 5,464,924; and 5,275,853; see also PCT Application Nos. WO 99/48962; WO 99/12995; WO 98/29491; and WO 98/14498. Other suitable subsets of phenoxy resins, and thermoplastic epoxy resins, include, but are not limited to, hydroxy-functional poly(amide-ethers) such as those described in U.S. Pat. Nos. 5,089,588 and 5,143,998, poly(hydroxy amide ethers) such as those described in U.S. Pat. No. 5,134,218, polyethers such as those described in U.S. Pat. Nos. 5,115,075 and 5,218,075, hydroxy-functional polyethers such as those as described in U.S. Pat. No. 5,164,472, hydroxy-functional poly(ether sulfonamides) such as those described in U.S. Pat. No. 5,149,768, poly(hydroxy ester ethers) such as those described in U.S. Pat. No. 5,171,820, [0030]
“Copolyester Barrier Materials” include copolyesters of terephthalic acid, isophthalic acid, and at least one diol having good barrier properties as compared to PET, such as those disclosed in U.S. Pat. No. 4,578,295 to Jabarin, and which are commercially available as B-010, B-030 and others of this family. (Mitsui Petrochemical Ind. Ltd., Japan); [0031]
Examples of preferred polyamide materials include MXD-6 from Mitsubishi Gas Chemical (Japan). Other preferred polyamide materials are blends of polyamide and polyester, including those comprising about 1-10% polyester by weight, where the polyester is preferably PET or a modified PET. The blends may be ordinary blends or they may be compatibilized with an antioxidant or other material. Examples of such materials include those described in U.S. patent application Ser. No. 10/395,899, filed Mar. 21, 2003, which is hereby incorporated by reference in its entirety. Polyamide materials may also be used as substrate materials. [0032]
Other preferred materials include, but are not limited to, polyamides, polyethylene naphthalate (PEN), PEN copolymers, PEN copolyester, PET/PEN blends, and combinations thereof. Preferred materials also include, but are not limited to, acrylic resins including polyacrylonitrile polymers, acrylonitrile styrene copolymers. PEN materials can be purchased from Shell Chemical Company. [0033]
In another embodiment, a compatibilized polymer blend, comprising polyamide, PET or a PET-containing copolymer, and at least one compatibilizer may be used as one or more layers of the preform/pouch. In a preferred embodiment, a compatibilized polymer blend comprises polyamide, preferably MXD-6, PET or a PET-containing copolymer, and at least one compatibilizer selected from IPA-modified PET and PET ionomer. (See U.S. application Ser. No. 10/395,899, filed Mar. 21, 2003) [0034]
In one embodiment, a multilayer pouch comprises (a) a first interior layer comprising polyethylene terephthalate, (b) a second exterior layer comprising one or more materials including, but not limited to, polyethylene, polypropylene, modified polyolefins, modified elastomers, polystyrene, and thermoplastic polyurethane, wherein said pouch is fabricated by suitable blow molding operations of preforms. In another embodiment, exterior layers are provided as foamed layers utilizing either physical or chemical blowing agents. The pouch of preferred embodiments further comprises a bottle neck finish that can be filled in suitable filling lines at high outputs. The bottle neck finish of one embodiment is preferably threaded or crowned. In embodiments utilizing a crowned bottle neck finish, the crown type neck finish preferably is of the type capable of receiving a snap-on open/close fitment. In one embodiment, a preferred pouch may further comprise a “push-pull” or a non-spill fitment, or other suitable bottle closure. [0035]
In one embodiment, preforms suitable for blow molding into flexible pouches may be prepared by conventional methods known to those of skill in the art, including, but not limited to, overmolding, co-injection, and inject-over-inject methods. For example, the methods disclosed in U.S. Pat. No. 6,352,426, filed Apr. 21, 1999, U.S. Pat. No. 6,391,408, filed Oct. 19, 1998, U.S. Pat. No. 6,312,641, filed Oct. 17, 1997, U.S. patent application Ser. No. 10/090,471 filed Mar. 4, 2002, PCT publication WO03/080731 corresponding to U.S. patent application Ser. No. 10/395,899 filed Mar. 21, 2003, and U.S. patent application Ser. No. 10/614,731 filed Jul. 3, 2003, herein incorporated by reference in their entirety, may be used. In one embodiment, overmolded preforms are preferably made using techniques described in detail in U.S. Pat. No. 6,312,641 and PCT Publication Nos. WO 99/20462, WO 00/62998, and WO 01/40618. In embodiments wherein the preform is made by overmolding processes, the overmolding processes allow a high degree of process flexibility to allow for structural strength, accurate control of multilayer films, and a “no spill” container. [0036]
In one embodiment, a flexible multilayer pouch with sufficient rigidity for self-standing storage of beverages comprises (a) a first, interior layer comprising a material from PET or polypropylene, (b) a second, exterior layer comprising a polyolefin, polystyrene, or polyurethane film, coating or foamed structure, and (c) a suitable bottle closure, or a push-pull closure, or a “non-spill” fitment closure, with said pouch manufactured by suitable blow molding processes utilizing preforms complete with a neck finish, and filled on suitable bottle filling lines. [0037]

3. Decoration

In one embodiment, the flexible pouches are further dressed, decorated, and/or inserted into a rigid outer container, for example a box. In preferred embodiments, the rigid outer container comprises a linerboard or molded fiber. In one embodiment, a pouch manufactured to be placed in an outer container may be manufactured with reduced weight as support will be provided by the outer container. For example, a 16 oz. PET juice bottle with a 38 mm neck finish might have a total weight of 30 grams to provide the necessary support/structure for product handling, shipping, and storage as a bottle. However, a similar capacity pouch/liner can be blown with a reduced weight preform (for example, about 20 grams), as self-supporting container properties are provided to the pouch/liner by the outer container. In one embodiment, the pouch/liner may also be shaped such that air is easily vented when the filled pouch/liner is dropped into the box/container. [0038]
In one embodiment, the outer carton may comprise pre-treated or untreated materials. Preferably the outer carton exhibits one or more of the following characteristics: high wet strength, structural strength, and/or water repellency. In one embodiment, these properties can be accomplished with polymer impregnation or coating of the outer carton. In one embodiment, impregnation or coating with polyhydroxyaminoethers or PET can provide one or more of the desired properties as well as provide a recyclable container. (See WO 01/46523, the entire disclosure of which is incorporated by this reference) In another embodiment, molded fiber articles with hinges may be utilized, again as either treated or untreated to enhance physical properties or appearances (graphics). The pouch of certain embodiments may be encapsulated by a pre-made molded fiber structure with the base of the molded fiber connected to the top by a hinge, and the two pieces glued together under the neck finish. In another embodiment, a heat shrink label can be applied on the molded fiber structure to impart one or more of the following properties: graphics, strength, and/or water protection properties. [0039]
Preferred external cartons/boxes can be constructed of various pulp or paper products without concern for direct food contact. In other embodiments, molded fiber constructions, old corrugated cardboard, unbleached or bleached pulp linerboards can be used as desired to provide exotic designs and shapes not possible with bottles. Coatings or multilayer laminate constructions of preferred embodiments can be designed for physical strength or exterior appearance without concern for direct food contact issues. Incorporating products like Kymene, phenoxy products, or sprayed PET emulsions can give the molded fiber structure structural strength and water repellency. This flexibility provides for optimum economics in providing a functional package at the lowest cost with the optimum appearance. [0040]
In one embodiment, the appearance and strength of the outside container can be further enhanced by film transfer coating as taught in U.S. Pat. Nos. 5,603,996, 5,981,011, 6,132,822, 6,187,389 and 6,193,831 to Overcash et al. Properly formulated and applied transfer coatings can provide an image-receptive, high gloss, barrier coated surface to the container that is fully recyclable. These types of coatings can provide a metallized appearance while maintaining complete recyclability of the paperboard outer container. Further, holograms and other security features can be included in the film transfer coating to help safeguard against counterfeiting or to provide evidence of tampering. [0041]
The package can be designed to be fully recyclable unlike current plastic or paper gable top cartons. The package can be fully recycled by simply pulling the pouch/liner from the carton and separating the plastic liner from the carton/box for use in their respective recycle streams. [0042]

B. Modified Production Line

As described above, in preferred embodiments, a continuous production line begins with a preform which is blow molded into a flexible pouch, the pouch is then filled with the desired product, and closed for final use. In one embodiment, the filled pouch is then further dressed, decorated, and/or inserted into a rigid outer container, for example a box. In other embodiments, the pouch is placed into a rigid outer container prior to filling. In a preferred embodiment, the production line is a modified version of the type commonly used for handling rigid containers, such as those used to manufacture and fill soft drinks. The production line of preferred embodiments is modified to handle the neck portion of the flexible pouch throughout the production line. A preferred filling process is of the type known in the art for filling PET bottles. Such systems include, but are not limited to, aseptic, hot fill, or chilled filling lines. [0043]
As previously described, the production line of preferred embodiments is a modified version of types commonly used for handling rigid containers. In conventional filling lines, once the preform is blow molded into a rigid container or bottle the container/bottle is placed onto a table top conveyor or forced air conveyor wherein the containers/bottles are in direct contact with each other. This type of conveyor is suitable for rigid containers/bottles as they are self supporting. However, given the nature of the flexible pouches of preferred embodiments, this type of handling is not feasible, especially if increased production speed is to be maintained. Accordingly, in order to handle the flexible pouches of preferred embodiments, the conventional production line is modified in order to handle the preform/pouches via the neck portion throughout the production process. This modification allows for high speed manufacturing and filling of flexible pouches on a system similar to those used for rigid containers. Advantageously, preferred embodiments modified handling systems may be used with conventional blow molders and filling systems. In preferred embodiments, suitable filling systems are known to those of skill in the art and may be of the type produced by Krones A G (Germany) or Sidel (Le Havre, France). For example, the Mecafill VKP-PET from Krones is a filling machine of the type suitable for use in preferred embodiments. Suitable blow molding machines of preferred embodiments are known to those of skill in the art and may be of the type produced by Sig Corpoplast (Germany). For example, the BLOMAX® Series III blow molding machine from Sig Corpoplast may be utilized in preferred embodiments. Moreover, the center line spacing of traditional production lines remain the same in preferred embodiments. [0044]
In preferred embodiments, the handling systems of conventional production lines are modified to handle the neck portion of the flexible pouches as individual units throughout the manufacturing and filling processes. The pouches of preferred embodiments are preferably transferred through the production line with a positive transfer system, that is a system that intentionally grasps the pouch at a specific point in the line every time. For example, the transfer system may grasp the pouch at the pilfer band of the neck finish at each transfer point. In other embodiments, the transfer system grasps the pouch at the neck cylinder or the support ring. Those of skill in the art will recognize that numerous points on the rigid neck portion provide suitable transfer points. Suitable transfer mechanisms of preferred embodiments include, but are not limited to, spring loaded forks, pistons gripping from within the pouch, and cylinders over the top of the neck finish. Other suitable transfer mechanisms are known to those of skill in the art. Suitable handling systems may be obtained from Procomac Packaging (Collecchio (PARMA) Italy). For example, in one embodiment, a CONVAIR 2000 handling system from Procomac may be used. [0045]
FIG. 1 illustrates one embodiment of a preferred production line. The handling system which connects the stations in the system is indicated by pairs of parallel lines connecting the various components. In a preferred production line, a [0046] preform 10 enters the production line into the blow molding system where it is subsequently blow molded 20 into a flexible pouch. The pouch is then optionally rinsed 30 before proceeding to the filling system. Once in the filling system, the pouch is filled 40 with the desired product and capped 50. The filled pouch may be optionally dried 60. The pouch may be dressed, decorated and/or placed in a rigid exterior container 70 prior to being released from the neck portion handling system 80. Alternatively, the dressing, decoration, and/or placing in an exterior container may take place at one or more other places in the production line, or may occur after the neck is released from the system. The pouches may then be sent to a case or palletizer 90 for distribution. Other components may be optionally included in the system.
FIG. 2 illustrates one embodiment a cross-section of a [0047] preferred preform 100. The preform 100 comprises a neck finish 110 and a body portion 120. The neck finish 110 begins at the opening 130 to the interior of the preform 100 and extends to and includes the support ring 140. The neck finish 110, in the illustrated embodiment, is further characterized by the presence of the threads 150, which provide a way to fasten a cap for the bottle produced from the preform 100. In other embodiments, the neck finish 110 may be non-threaded and/or otherwise adapted to receive a closure. Just under the neck finish 110 is the neck cylinder 190. The neck finish together with the neck cylinder form what is referred to herein as the “neck portion”, and comprise the portion of the preform by which the handling system preferably handles the preform. The body portion 120 is an elongated and preferably cylindrically shaped structure extending down from the neck cylinder 190, through the transition 180 and culminating in the rounded end cap 160.
In preferred pouches, the thickness of the pouch wall is thinner than a standard container or bottle which allows for a shorter cooling period after blow molding, thereby increasing production rates. For example, under conditions suitable for blow molding bottles/containers, each cavity of the blow molder produces approximately 1,500 containers per cavity. This can be increased to approximately 2,000 or more containers per cavity in preferred flexible pouch embodiments due to the decreased cooling time. In preferred embodiments, the average thickness of the flexible pouch sidewall ranges from about 0.003 to about 0.010 inches (about 0.0076 to about 0.025 centimeters). This shorter cooling time combined with the speed of rigid filling lines allows for preferred embodiments with production rates of up to 50,000 to 70,000 pouches per hour. [0048]
The various methods and techniques described above provide a number of ways to provide liners and containers comprising such liners. Of course, it is to be understood that not necessarily all objectives or advantages described may be achieved in accordance with any particular embodiment described herein. Thus, for example, those skilled in the art will recognize that the apparatus may be built and/or the methods may be performed in a manner that achieves or optimizes one advantage or group of advantages as taught herein without necessarily achieving other objectives or advantages as may be taught or suggested herein. [0049]
Furthermore, the skilled artisan will recognize the interchangeability of various features from different embodiments. Similarly, the various features and steps discussed above, as well as other known equivalents for each such feature or step, can be mixed and matched by one of ordinary skill in this art to perform methods in accordance with principles described herein. [0050]
Although the invention has been disclosed in the context of certain embodiments and examples, it will be understood by those skilled in the art that the invention extends beyond the specifically disclosed embodiments to other alternative embodiments and/or uses and obvious modifications and equivalents thereof. Accordingly, the invention is not intended to be limited by the specific disclosures of preferred embodiments herein. [0051]

Claims

What is claimed is:

1. A process for manufacturing and filling flexible pouches, the process comprising:

blow molding a preform having a neck portion into a flexible pouch having a neck finish;

filling said flexible pouch with a desired product;

closing or capping the filled pouch;

wherein the neck portion of the preform and pouch are used to handle the preform and pouch throughout the process.

2. The process of claim 1 wherein said process further comprises decorating and/or dressing the pouch.

3. The process of claim 2 wherein said pouch is filled prior to decorating and/or dressing of the pouch.

4. The process of claim 1 wherein said process further comprises placing the pouch in a rigid container.

5. The process of claim 4 wherein said pouch is filled prior to placing the pouch in a rigid container.

6. The process of claim 4 wherein said rigid container is a box.

7. The process of claim 1 wherein said pouch has at least one layer.

8. The process of claim 7 wherein at least one layer comprises polyethylene terephthalate or polypropylene.

9. The process of claim 1 wherein said pouch has one or more exterior layers comprising a material selected from the group consisting of polyethylene, polypropylene, modified polyolefins, modified elastomers, polystyrene, thermoplastic polyurethane, copolyester barrier materials, phenoxy-type thermoplastics, polyamides, polyethylene naphthalate, polyethylene naphthalate copolymers, polyethylene naphthalate/polyethylene terephthalate blends, polyethylene terephthalate, compatibilized polymer blends, and combinations thereof.

10. An apparatus for making and filling flexible pouches comprising:

a handling system that conveys preforms and/or flexible pouches through a manufacturing and filling system; and

a manufacturing system comprising a blow molding machine;

a filling system comprising:

a filling machine

a closing or capping machine

wherein the handling system conveys the preforms and flexible pouches throughout the entire system by the neck portion.

11. The apparatus of claim 10 wherein said blow molding machine blow molds a preform with a neck into a flexible pouch having a neck.

12. The apparatus of claim 10 wherein said filling machine fills a flexible pouch with a desired product.

13. The apparatus of claim 10 wherein said closing or capping machine closes a filled flexible pouch.

14. The apparatus of claim 10 wherein said apparatus further comprises a system which decorates and/or dresses the flexible pouch.

15. The apparatus of claim 14 wherein said system which decorates and/or dresses the pouch is placed before the filling system.

16. The apparatus of claim 10 wherein said apparatus further comprises a system which places the flexible pouch into a rigid container.

17. The apparatus of claim 16 wherein said system which places the flexible pouch into a rigid container is placed before the filling system.

18. The apparatus of claim 16 wherein said rigid container is a box.

19. The apparatus of claim 10 wherein said pouch has at least one layer.

20. The apparatus of claim 19 wherein at least one layer comprises polyethylene terephthalate or polypropylene.

21. The apparatus of claim 10 wherein said pouch has one or more exterior layers comprising a material selected from the group consisting of polyethylene, polypropylene, modified polyolefins, modified elastomers, polystyrene, thermoplastic polyurethane, copolyester barrier materials, phenoxy-type thermoplastics, polyamides, polyethylene naphthalate, polyethylene naphthalate copolymers, polyethylene naphthalate/polyethylene terephthalate blends, polyethylene terephthalate, compatibilized polymer blends, and combinations thereof.