DE2441085A1 - METHOD FOR COATING FABRICS AND SIMILAR FLEXIBLE MATERIALS AND DEVICE FOR CARRYING OUT THE METHOD - Google Patents

Description

Mr. Ser ^ e FERRARI 69390 GHARLY / VERNAISOU, France

Process for coating fabrics and similar pliable materials and apparatus for implementation of the procedure

The invention relates to a method and an apparatus for coating woven goods with a synthetic one Material such as polyvinyl chloride, resin, [elastomer, or the like.

In this regard, devices are known in which the woven fabric is unrolled from a bobbin or a corresponding stand and in a longitudinally tensioned state a>

supplied with a squeegee coating machine I and a layer of plastic is applied in this on one of its sides. The coated fabric

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A baking oven then runs after it has left
it by passing it between two rotatable rollers
can be calendered. Finally it is cooled down and rolled up on a frame.

The disadvantage of this known method is that
the fabric shrinks in the transverse direction, with the shrinkage being particularly strong when it comes to fabric made of synthetic fibers, such as polyamide or polyester

ι the manufacturers normally in non-thermoset additive j

stood so that as soon as they reached a certain temperature;

are exposed to show significant shrinkage. > It goes without saying that such a break-in is the

Value of the layer consisting of fabric and plastic!

materials significantly impaired. j

In order to remedy this deficiency, it has already been proposed that the base fabric be made of threads that are produced by means of thermal; Treatment are stabilized to produce. However, this is a relatively expensive process
which the price of the fabric made on the basis of such threads is increased by the fact that their weight per meter
higher than that of untreated threads) without the
mechanical properties of these threads are improved.

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In addition, fabrics made from stabilized threads have a greater coefficient of elongation, which is higher when the Zaiil of applications proves disadvantageous. Above all, however, regardless of the quality of the stabilization process * the shrinking process is not completely prevented.

In addition to the disadvantages mentioned, it also allows shrinking the coated fabric does not allow the manufacture of products j whose base fabric is made from a mixture of synthetic fibers j interrupted, natural, artificial or synthetic Fibers. The threads running through would, however, have excellent heat resistance and at the same time such fabrics the interrupted threads with one-sided coating! give a comfortable grip · for one-sided and double-sided

Coating on the side also shows better adhesion the plastic layer on the fabric. Making a

; such a product in view of the extreme shrinkage

The differences between the two textile materials, even with pretreatment, could not be taken into account for the reasons mentioned.

! The present invention aims to achieve the above Eliminate disadvantages and produce a coating

th fabric that is not subject to any shrinkage in the course of its manufacturing process.

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The solution to this problem is that the tissue according to the invention before it in the coated state Baking furnace is fed, is introduced with its longitudinal edges in the retaining members of a tenter frame, which the accompanied said fabric until the end of the calendering process; in this constantly both in longitudinal and in In the transversely tensioned state, it is then subjected to at least a second coating, which, while the first If the layer is still warm, it is applied to the same side.

The invention is to be described below, for example, with the accompanying drawing * It shows:

Pig. 1 schematically shows the general arrangement of a coating machine arrangement according to the invention,

"2 shows a further embodiment in Partial playback

The system shown in Fig. 1 begins first with an unwinding device, which is the reception of a reel or reel 1, which includes the fabric 2 to be coated in the rolled-up state. From here, the fabric 2 passes through a

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it in the longitudinal direction stretching device 3, whereupon it a coating device operated in a known manner 4 is fed. The device, which is expediently loaded with synthetic material, provides the fabric 2 by means of a doctor blade with a coating or a layer of synthetic material.

N _e to the present process, the fabric 2 of a slave device 5 is fed, after leaving the Beschichtungsvorrichtüng 4, in which the fabric longitudinal edges in laterally disposed retaining members, such as clamps, grippers, etc. of a clamping frame ₉ as like in the textile industry for finishing textiles or used to be introduced o In Pig. 1 and 2 one of the tongs 5 'of such a tenter frame is shown, which are held by lateral chains advancing synchronously with the fabric 2 that the possibility of shrinkage is excluded.

The coated fabric 2 stretched by the frame then passes through an oven 6 in which the applied synthetic material is gelled or polymerized in the usual way. In this oven, the coated fabric 2

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supported by spaced transverse, rotatingly moving and cooled drums 6 'which have any Prevent the fabric from sagging in the transverse or longitudinal direction. After leaving the furnace 6 this is constantly through the frame stretched fabric 2 while still hot calenders formed from two superposed rollers are supplied, one of the rollers being provided with projections can be, which are imprinted in the plastic layer. After leaving the calender 7 it is still heated Coated fabric is in the state and is constantly tensioned by the frame by means of a second device 8, which of the first device 4, subjected to a second coating on the same side. This second Coating is consequently applied to an already heated and calender-j tes product, which significantly improves the quality of the second layer.

After this process, the fabric 2 passes through a second ^{furnace 9 provided with support drums 9 1} and a block tang 10 corresponding to the first-mentioned calender and is freed from its tenter at 11 in order to finally be peeled off and rolled onto a device 12.

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The fabric obtained in this way does not show any shrinkage effects, but rather its width in coated and the condition rolled up on device 12 corresponds exactly to that of the original condition wound on reel 1 Tissue, regardless of the type, such as natural, artificial, bynthetic fibers, etc. and the nature of the Tissue, so untreated and therefore much cheaper threads or fibers can be used} furthermore be-j Above all, there is the possibility of using different materials, especially as weft yarn, without the danger different degrees of shrinkage, with which the production new articles on the basis of these coated fabrics become possible.

Also of interest is still the fact that, despite the through Spannranmen 5 'caused adherence of the fabric width and _z of the device 3 and the second calender 10 wipe overall' secured longitudinal tension, preventing any shrinkage, the warp and weft yarns nevertheless a shrinkage with the result that the tissue becomes thinner and its surface becomes smoother. It could be demonstrated that the reduction in fabric thickness is of the order of 25%, so that fabric 2 in the final state is an almost smooth fabric comparable to a solid sheet of paper:

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depicted. Under the conditions described, a completely uniform and with the same weight per unit area of the synthetic material achieved a better quality coating, while at the same time a lighter adhesion this material is observed on the tissue. The fabric picture also shows that the synthetic material can at least partially penetrate into the tissue covered with it, so that the left as well as the right side are coated equally.

In order to achieve an even more uniform coating, another embodiment shown in FIG. 2 can be used find, according to which the attachment of the clamping frame of the device 5 in front of the first coating device 4 he follows. In this case, the fabric 2 or a corresponding carrier is made of synthetic material Cover already provided in the transverse direction tensioned state, advantageously a heating battery 13 is arranged above the coating device 4 to a thermal stress and an at least temporary Fixation of the longitudinal and transverse tensions acting on the tissue to allow.

Of course, depending on the desired

Any number of layers can be applied in thickness. - 9 -

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Claims (1)

Expectations 1 · Process for the destruction of tissues or similar pliable materials, in which the carrier material is unrolled under tension, with a synthetic layer Material applied to polymerize ! of the layer material is heated in an oven, under heat j infeed calendered, cooled and subsequently heated j is scrolling, marked thereby j that the longitudinal edges of the coated fabric »(2) in front I the passage through the furnace (6) in retention organs one the fabric until the end of the calendering process j accompanying stenter frame and the : fabric constantly in both transverse and longitudinal directions , tensioned state is held, at least ■ with respect to one applied on the same side I coating while the first or other layer is on ! is still in a heated state " j 2. The method according to claim 1, characterized in that i prepare the attachment of the clamping frame. the first : The stratification process has taken place. : - 10 - t, 509813/0988 - ίο - 3. The method according to claim 2, characterized in that the fabric is stretched in a transverse direction Condition is heated 509813/0988