DE102006037111A1 - Process to manufacture cleaning cloth with two layers of non-woven fibers sandwiching inner layer joined by enhanced temperature and pressure - Google Patents

Abstract

In a process to manufacture a textile cleaning cloth (11), two outer layers (1, 11) of thermoplastic fibres sandwich an inner layer (7) of non-thermoplastic fibers. Prior to their passage through a slit, cellulose material is scattered between the outer layers. The resulting three layers are presented to the slit (2) and pass through (7) where they are subjected to raised temperature and pressure. .

Description

The The invention relates to a process for producing a textile Fabric, which two outer layers thermoplastic material and an inner material Non-thermoplastic material comprehensive situation.

The The invention further relates to a textile fabric and a section this textile fabric comprehensive wipe.

Wipes - also called cleaning cloths - should by a high absorbency and resistance to fraying even under mechanical stress distinguished. It has long been known these wipes Nonwoven fabric comprising thermoplastic fibers.

so absorbent wipes become prevalent today produced by water jet needling. In hydroentanglement the individual fibers are confused by mechanical interaction devoured each other.

adversely Here is that this manufacturing process a high energy input requires, as a not inconsiderable part of the for hydroentanglement required Process water from the absorbent Material first ge is stored and dried out in another process step again must become. However, this drying out requires considerable Amounts of energy.

Furthermore are those associated with the production of the thermoplastic fibers Energy costs in recent years The past has risen considerably, since crude oil or petroleum products are used as raw materials Find.

From the EP 946 805 B1 already a wipe is known which comprises a proportion of non-thermoplastic pulp. This pulp is added to the wipe by thermosetting thermoplastic material prior to solidification of an inner layer of a nonwoven comprising thermoplastic fibers in the formation of this layer in the so-called "coform" process described in U.S. Pat U.S. Patent 4,818,464 and 4,190,324 pulp is added and this mixture is combined with the other layers.

The disadvantage is in the from the EP 946 805 B1 known production method for wipes, that the execution of the method due to the "coform" method is associated with an increased expenditure on equipment.

Of the The invention is therefore based on the object of specifying a method with which a textile fabric, its sections as wipes can be used especially inexpensive can be produced.

These The object is achieved by the reproduced in claim 1 method.

at This process involves two layers of thermoplastic fibers comprehensive material fed to a machining gap, in which the solidification takes place to the textile fabric. Before the Running in of these two layers in the machining gap is between the two layers brought an inner layer, consisting mainly of non-thermoplastic Material exists. By "predominantly" is meant here that the volume fraction of the non-thermoplastic material on the volume of the material of the inner layer is at least 50%. By doing Machining gap, the layers are subjected to temperature and pressure. The bonding area, i. the areas where solidification takes place are less than 25% of the total area of the textile fabric.

Surprisingly, it has been shown that with this very simple method, a sufficient solidification of the individual layers is effected to the fabric, even if the inner layer in contrast to the inner layer of the EP 946 805 B1 contains no thermoplastic material and although the bonding area is less than 25% of the total area of the fabric. Apparently, due to the compacting of the layers caused by the nip and the effect of temperature, a sufficient bond between the thermoplastic fibers of the outer layers and the non-thermoplastic fibers of the intermediate layer takes place. For particularly thin intermediate layers, even the outer cover layers are welded together through the middle layer.

Surprisingly have shown that the solidification result is further improved can be if before performing the material through the machining gap at least one of the layers of the thermoplastic material is moistened. This can be, for example by applying water vapor on the predominantly non-thermoplastic Material facing side of the layer of thermoplastic material respectively.

The solidification of the layers to the textile fabric takes place in the inventive method completely without the use of water jets, so that it requires no energy-consuming drying step. Also, the energy required to carry out the process is therefore ge compared to hydroentanglement ring.

tries have shown that a particularly effective solidification of the individual Layers to the textile fabric at the same time high absorbency of the fabric is achieved when the machining gap on one side of a Engraving roller is limited. explainable this is due to the fact that at the engraving points, i. in places, on which the outer surface of the Engraving roller is sublime, the thermoplastic fibers especially intensely in contact with the predominantly non-thermoplastic material arrive and due to the effect of energy a form and / or substance between the non-thermoplastic and the thermoplastic material comes about.

The Temperature supply can be done, for example, that the Engraving roller and / or the machining gap limiting counter tool are heated.

The Counter tool can from another roller, such as a smooth roller be formed.

Further Is it possible, to provide as a counter tool a sonotrode, by means of which the Fibers are excited to vibrate by friction of the fibers heat each other generate and thus lead to welding. The sonotrode can be a relative to the guided past her Be formed stationary or rolling.

Especially preferred is an embodiment of the method according to the invention, in which the individual binding areas, which together form the binding area of the textile fabric form, separated from each other. In particular, can these are single circular bond areas, which can be produced with a so-called dot engraving roller. These Variant of the method is particularly suitable for the production a textile fabric, in which the inner layer as a sheet, for example web form the machining gap is supplied.

at Another variant of the method according to the invention, the two outer layers again fed to a machining gap, between the two outer layers becomes an inner layer of predominantly non-thermoplastic material brought and the layers are in the machining gap so with Temperature and pressure applied to that in the fabric Bonding areas are generated, the unconsolidated areas at least almost complete surround. In this variant of the method according to the invention Ver thus becomes textile fabric that produces unconsolidated areas, also referred to as "pillows", that are from solidified areas are surrounded. This variant of the method according to the invention is suitable in particular for producing a textile fabric in which the inner layer before the processing step of solidification on the lower layer as pulp or cellulose containing, loose material is sprinkled because the solidified areas surrounding the pads Prevent the spilled material from the fabric emerges.

Especially an embodiment of this variant of the method according to the invention is preferred which limits the machining gap of two rolls.

A These rollers can have an engraving, the linear elevations has, which causes the solidified areas.

Both the machining gap supplied outer layers can thermoplastic material comprising material such as fabric or Fleece exist. However, it is also possible for one of the two layers to use thermoplastic film, for example, if a textile sheet to be produced by which liquid to be absorbed should not be able to penetrate.

A particularly reliable Solidification in the machining gap is achieved if at least one the outer layers out of a slight pre-consolidated nonwoven web of thermoplastic material.

Especially then, if these are slightly pre-consolidated Layer which forms lower layer in the machining gap, the non-thermoplastic can Material by sprinkling on this layer before passing through the machining gap supplied become. The upper layer can then - preferably also as slight pre-consolidated nonwoven web - fed after the non-thermoplastic material has been sprinkled.

In order to prevent fabrics which are present in an inner layer of non-thermoplastic material from being unfolded from portions of the same at the edges, it is particularly preferred if the gravure roll is designed to produce a consolidation pattern with intersecting solidification strips. Wipes having non-divergent edges can then be created by cutting the fabric within the consolidation strips such that the "chambers" formed between the intersecting consolidation strips are the non-thermoplastic material enclose rial.

at another, possible Variant of the method according to the invention becomes the inner layer as a sheet fed.

Especially preferred is a variant of the method according to the invention, in which the inner layer comprises pulp. This pulp can then be called Pulp sprinkled or fed as a tissue web.

Further is it to increase the absorbency of the textile fabric possible, the inner layer before entering the machining gap liquid absorbing To provide funds which is a significant advantage over the previously used method the water jet needling means.

Especially preferred is a development of the method according to the invention, when the textile fabric is divided into sections under the influence of temperature. by virtue of this measure becomes reliable prevents the sections from fanning out at the edges as a result of the effect of temperature Edge consolidation of the section is effected.

Especially suitable for subdividing into sections are Ultraschneideinrichtungen, as they are already used for cutting thermoplastic materials are known in the art, because the cut a welded edge leaves behind that a fraying of the pulp is reduced.

All especially clean cuts can be made be when the subdivision into sections close or even within a solidification strip takes place.

The The invention also relates to a textile fabric which has two outer layers, at least one of which comprises thermoplastic fibers, and an inner layer of predominantly non-thermoplastic material having. Such a textile fabric is characterized a particularly cost-effective Manufacturability.

A particularly high fiber resistance under mechanical stress, such as it acts on the fabric during wiping or cleaning, the textile fabrics on, if - how preferred - the outer layers consist of thermoplastic nonwoven material.

tries have shown that the textile fabric for use as wiping or cleaning cloths has satisfactory absorbency values, if the inner layer consists of pulp. Furthermore, it stands out this textile fabric by especially low production costs, since pulp can be provided inexpensively is.

The absorbency of the textile fabric can be increased further be when the inner layer is liquid comprising absorbent material.

Further The invention also relates to a wipe which comprises a portion of a above-described textile fabric includes.

The Invention will now be explained with reference to the accompanying drawings. Show it:

1 - schematically - a first embodiment of the method according to the invention;

2 A second embodiment of the method according to the invention in one 1 corresponding view;

3 a fabric produced by a first variant in a plan view;

4 a section through the section line III-III in 3 ;

5 Schematically, a pair of rollers forming a machining gap for use in a second variant of the method according to the invention;

6 a means of the roller pair according to 5 solidified textile fabric in a plan view;

7 the textile fabric according to 6 in a section along the section line VII-VII;

8th another, the machining gap forming pair of rollers for use in a further variant of the method according to the invention, again schematically, and

9 a using the roller pair according to 8th manufactured textile fabric.

At the first, in 1 illustrated preferred variant of the method according to the invention is a lower layer 1 a slightly preconsolidated nonwoven web comprising fibers of a thermoplastic material (eg, PP, PES, PA), a machining nip 2 fed. This machining gap 2 is between a lower gravure roll 3 , which has on its outer circumference a cross-running, raised engraving, and a smooth roller 4 educated. In symbolized by the arrows P advance direction P is by means of a scattering device 5 in front of the machining gap 2 Pulp (Pu le) 6 sprinkled. On the resulting situation 7 is from above via two pulleys 8th . 9 another location 10 that of the lower layer 1 corresponds to the machining gap 2 fed.

The surfaces of the rollers 3 and 4 are heated to a temperature below that in the machining gap 2 on the layers 1 . 7 and 10 acting pressure to a partial form and / or material bond of non-thermoplastic and thermoplastic fibers and thus for compaction of the layers 1 . 7 and 10 to a textile fabric 11 leads. This textile fabric can then be divided into sections in a cutting device, not shown in the drawing, which are finally used as wiping or cleaning cloths.

At the in 2 illustrated variant of the method according to the invention, the supply of the position takes place 7 between the lower layer 1 and the upper layer 10 that the layers 1 and 10 in 1 correspond, as a tissue train. The layers 1 . 7 and 10 turn in the machining gap 2 to a textile fabric 11 solidified. The machining gap 2 is formed by the gravure roller 3 and a sonotrode 12 which oscillates at a frequency in the range of ultrasound and leads to a solidification by generating internal frictional heat. In the feed direction of the layers before the machining gap 2 are humidifiers 30 provided by means of which water vapor on the location 7 facing sides of the layers 1 and 10 is applied.

At the in 3 and 4 shown textile fabrics 13 it is such, in which the layers 1 . 7 . 10 have been connected by means of a dot engraving roller. The individual engraving points 14 are separated by unbonded areas. The binding surface, ie the sum of all surfaces of the individual engraving points 14 is significantly less than 25% of the total area of the textile fabric.

To prevent a portion of such a fabric 13 Fibers at the cutting edges, there is a cut, as in 3 is symbolized by the scissors, under the action of pressure and temperature, in particular special means of an ultrasonic cutting device such that the cutting edge is solidified.

At the in 3 and 4 fabric shown consists of the inner layer 7 in particular from a tissue web.

At the in 6 and 7 shown textile fabrics 15 the bonding surface consists of a solidification pattern 16 which intersecting solidification strips 17 having. These consolidation strips enclose unbonded areas 18 in which the layers 1 . 7 . 10 are formed pillow-like.

To produce the intersecting solidification strips 17 serves a the machining gap 2 limiting roller pair 19 . 20 , The lower roller is engraved 21 , which has intersecting, linear elevations provided. The upper roller 10 is designed as a smooth roller.

Again, the subdivision into sections under the influence of temperature along the in 6 left cut line or, preferably, within a solidification strip, as in 6 shown on the right. If the cut is within a solidification strip, the effect of temperature to avoid fraying the cut edge is not mandatory.

In 9 is another embodiment of a textile fabric 23 shown that again pillow-shaped, non-solidified areas 24 includes that of solidification strips 25 are limited.

In contrast to the textile fabric 15 according to 6 A solidification strip runs parallel to the edge, ie in the advancing direction of the fabric, whereby it can be more easily divided into sections along this hardening strip.

In 8th is - schematically - a pair of rollers 26 . 27 shown, the lower roller 27 with an engraving 29 provided for generating the consolidation pattern in 9 suitable is.

1

Under location

 2

machining gap

3

engraved roll

4

roller

5

spreader

6

cellulose

7

location

8th

idler pulley

9

idler pulley

10

location

11

textiles sheet

12

sonotrode

13

textiles sheet

 14

engraving points

15

textiles sheet

16

consolidation pattern

17

solidifying strip

18

areas

19

roller

20

rolling

22

engraving

23

textiles sheet

 24

areas

25

solidifying strip

26

roller

27

roller

29

engraving

30

humidification

P

arrows

Claims (23)

Process for producing a textile fabric ( 11 ), which two outer layers ( 1 . 10 ), at least one of which comprises thermoplastic fibers and an inner layer comprising predominantly non-thermoplastic material ( 7 ), characterized in that the two outer layers ( 1 . 10 ) a machining gap ( 2 ), that in front of the machining gap ( 2 ) between the two outer layers ( 1 . 10 ) an inner layer ( 7 ) is made of mainly non-thermoplastic material and that the layers ( 1 . 7 . 10 ) in the machining gap ( 2 ) are subjected to temperature and pressure such that the bonding area is less than 25% of the total area of the textile fabric. Method according to claim 1, characterized in that the machining gap ( 2 ) on one side of a gravure roll ( 3 ) is limited. Method according to claim 2, characterized in that the machining gap ( 2 ) on the other side of a smooth roller ( 4 ) is limited. Method according to claim 2, characterized in that the machining gap ( 2 ) on the other side of a sonotrode ( 12 ) is limited. Method according to one of claims 1 to 4, characterized that the individual bonding areas of the bonding surfaces from each other be trained separately. Process for producing a textile fabric ( 11 ), which two outer layers ( 1 . 10 ), at least one of which comprises thermoplastic fibers, and an inner layer comprising predominantly non-thermoplastic material ( 7 ), characterized in that the two outer layers ( 1 . 10 ) a machining gap ( 2 ), that in front of the machining gap ( 2 ) between the two outer layers ( 1 . 10 ) an inner layer ( 7 ) is made of mainly non-thermoplastic material and that the layers ( 1 . 7 . 10 ) in the machining gap ( 2 ) are subjected to such temperature and pressure, that in the textile fabric bond areas are generated, the non-solidified areas at least almost completely surrounded. Method according to Claim 6, characterized that the machining gap is limited by two rolls. Method according to claim 7, characterized in that that the machining gap is of a smooth and a linear, Intersecting elevations having gravure roll is limited. Method according to one of claims 1 to 8, characterized that one of the outer layers consists of a thermoplastic film material. Method according to one of claims 1 to 9, characterized in that at least one of the outer layers ( 1 . 10 ) consists of a slightly pre-bonded nonwoven web of thermoplastic material. Method according to one of claims 1 to 10, characterized in that the inner layer ( 7 ) in front of the machining gap ( 2 ) on the lower outer layer ( 1 ) is sprinkled. A method according to claim 11, characterized in that the gravure roll ( 3 ) is formed so as to produce a solidification pattern with intersecting solidification stripes. Method according to one of claims 1 to 12, characterized in that the inner layer ( 7 ) as a sheet structure the machining gap ( 2 ) is supplied. Method according to one of claims 1 to 13, characterized in that the inner layer ( 7 ) Pulp. Method according to one of claims 1 to 14, characterized in that the inner layer ( 7 ) in front of the machining gap ( 2 ) Liquid absorbing agents are supplied. Method according to one of claims 1 to 15, characterized that the textile fabric is divided into sections under the influence of temperature. Method according to claim 16, characterized in that that textile fabrics divided into sections by means of an ultrasonic cutting device become. Method according to claim 16 or 17, characterized that subdivision into sections near or within a solidification strip he follows. Textile fabric ( 11 ) comprising two outer layers ( 1 . 10 ), at least one of which comprises thermoplastic fibers, and an inner layer ( 7 ) of predominantly non-thermoplastic material. Textile fabric according to claim 19, characterized in that at least one outer layer ( 1 . 10 ) consists of thermoplastic nonwoven material. Textile fabric according to claim 19 or 20, characterized in that the inner layer ( 7 ) Pulp. Textile fabric according to one of claims 19 to 21, characterized in that the inner layer ( 7 ) Comprises liquid absorbing material. Wipe comprising a section of a textile fabric ( 11 ) according to any one of claims 19 to 22.