EP1057541A1 - Device and method for partially applying a coating and web with a partial coating - Google Patents

Abstract

The device (1) has an applicator (3a) with nozzle, and a sieve (6a), which is located between nozzle and moving material length (W). A second applicator (3b) with nozzle and sieve (6b) is positioned on the opposite side of the material length, for direct or indirect application of a flowing synthetic medium (K) to the other side of the material. Both applicators are aligned relative to each other, so that a first coating (2a) at least partially coincides with a second coating (2b). The sieves are esp. formed as turnable sieve drums.

Description

The invention relates to a device and a method for applying partial surface coatings on a web and a web with such a partial Surface coating with the features of the preamble of the independent claims.

For the production of multilayer flat structures, it is known to have a punctiform one on a substrate Apply surface coating from an adhesive. Then it will Laminated substrate with another web. The web is over the glue points connected to the substrate. Such fabrics come for example as breathable Textiles for use in clothing. But there are also other applications, for example conceivable in automotive engineering.

Methods and devices are known from CH 648 497 and CH 663 310, in which the partial surface coating in the screen printing process with the help of a rotating Sieve drum can be applied. With this known method and with this known Device, it is possible to produce single-layer laminated, two-layer fabrics.

It is desirable to produce not only two-layer but also three-layer fabrics. For example, for garments it is advantageous if a medium, breathable Foil can be laminated on both sides (i.e. with an outer layer and with a lining).

It is therefore an object of the present invention, a method and an apparatus to apply partial surface coatings on both sides of a web create so that the web can be laminated on both sides. Another job of Invention is a web with a double-sided, partial surface coating to accomplish.

The double-sided surface coating should not impair the breathability of the web. In addition, the textile handle of the web should be laminated on one side Product lines should not be deteriorated.

According to the invention, these tasks are carried out with a device and with a method and with a web with the features of the characterizing part of the independent claims solved.

The inventive device for applying a partial surface coating is based on the screen printing principle shown in CH 648 497 and CH 663 310. The content of this Publications are hereby explicitly included in the content of the present application. The device has at least one first application device for direct or indirect application Apply a flowable plastic mass on one side of the web or on one Carrier on. The first application device preferably has at least one first application nozzle and a first movable sieve. The movable screen is between the application nozzle and the Material web or arranged between the application nozzle and the carrier. The first sieve is synchronous movable with the web or with the carrier.

When applied directly, the flowable plastic mass is passed directly through the sieve onto the Material web applied.

With indirect application, the flowable plastic mass is first placed on a carrier, for example applied in the form of an endless band or in the form of a cylinder and then transferred from the carrier to the web. Under application nozzle is related to the present application understood every device for applying the plastic mass.

The device according to the invention has for coating the other surface of the material web at least one second application device arranged on the other side of the web on. The second application device is used for direct or indirect application of the flowable Plastic mass on the other side of the web or on another carrier.

The first and the second application device are aligned with one another or can be aligned, so that surface coatings on the two sides of the web at least partially are congruent.

The second application device preferably has at least one second application nozzle and one second movable sieve. The second movable screen is between the second application nozzle and the web or between the second application nozzle and the carrier. The second sieve can be moved synchronously with the first sieve. Also, the first strainer and that second sieve mutually in the running direction of the web and / or in a direction transverse to Direction of the web can be aligned or aligned. With the adjustable arrangement of the The first and second screens can have the partial surface coating on one side of the Material web is congruent with the partial surface coating on the other side of the Material web can be applied. In this way, both sides of the web are coated or each generated uncoated surface sections. The breathability of both sides coated web is therefore only one-sided compared to breathability coated web not affected. The handle of a 3-layer laminate is also with a medium web according to the invention much better than with a web comparable to non-congruent coatings on the web coated on both sides with the handle of a web coated only on one side. It is also conceivable for others To provide order arrangements that allow a congruent coating on both sides. Instead of seven, e.g. Gravure rollers are used to hold the Serve plastic material and are mutually alignable.

In a particularly preferred embodiment, the first application device consists of a screen and the second applicator works on the gravure principle. Typically becomes a screen roller on one side and an engraving roller on the other side used. This arrangement is special with regard to the stability of the coating process advantageous. Due to the closed surface of the engraving roller, this can be special serve well as a pressure roller. Another advantage of this arrangement is that starting from the engraving roller, the screen roller can be produced in a simple manner as a pattern can. By making the screen roller based on the previously graphed engraving roller is ensured that the arrangement of the screen openings in the screen roller is arranged identically are like the recesses in the engraving roller. The engraving roller and the screen roller are can be mutually aligned in the manner described above.

A breathable film, e.g. B. Goretex or Sympatex used.

In a preferred embodiment of the invention, the first and second sieves are made from sieve drums, which are rotatably mounted. The sieve drums rotate in opposite directions.

However, a band-shaped rotating sieve is also conceivable.

In a particularly preferred embodiment, the surface coating is direct transferred from the screening drums to the web. The web runs between the two Sieve drums through. The two screening drums are arranged so that their axes lie in a plane perpendicular to the web. The sieve drum on one side of the The web therefore also serves as a pressure roller for the other screening drum on the other Side of the web.

The screening drums are mutually advantageous both in the axial direction and in the running direction the web can be aligned. In addition, the axes of the two screening drums can do the same aligned so that they are on the same level.

The orientation of the screening drums in the direction of travel of the web can be made by a suitable choice the rotational speed of the drums can be achieved. The speed of rotation is in operation of the two sieve drums of the same size, so that the two sieves are in sync with each other move. To align one screen with the other screen (in the circumferential direction the direction of movement can be selected differently as long as until the sieves are aligned. Aligned in this context means that the screen openings of the one screen at the moment the partial surface coating is applied are congruent with the sieve openings of the other sieve.

The screen openings typically form a grid of points. But there are other arrangements e.g. Lines, conceivable.

In a particularly preferred further exemplary embodiment, the first and the second are Strainer designed identically. For example, two identical sieve drums can be used. The identical selection of the screen pattern ensures that a congruent one partial surface coating can be generated on both surfaces of the web. However, it would also be conceivable to provide fewer sieve openings in one sieve than in the other Sieve so that the two sieves are not completely identical.

In the case of sieve drums, it is particularly advantageous to drive them with a servo motor. The servo motor allows the two screens to be aligned in the direction of travel of the web.

With the present device, it is conceivable to have only one web of material on both sides partial surface coating, e.g. as a preliminary product for the production of three-ply To provide fabrics.

In a preferred embodiment of the invention, the device points in the running direction Arrangements for laminating on both sides of the web according to the application devices the web. It is thus possible to use flat structures as triple laminates in one device to manufacture.

For example, fabrics, knitted fabrics or nonwovens are used as the lamination.

The method according to the invention for applying a partial surface coating a web is in particular using a device as described above advantageous. However, other devices would also be conceivable. According to the invention a partial surface coating is applied to both sides of the web. The surface coatings on the two sides of the web are aligned with each other in this way applied that the web is coated on both sides and uncoated on both sides Has sections. The partial surface coating on one side of the web is therefore at least partially congruent with the partial surface coating the other side of the web.

The fabric web according to the invention is advantageous with a device and with a method produced in the form described above. But there would also be other procedures and devices for producing such webs of material are conceivable. The web shows a partial surface coating on both sides. The surface coating is according to the invention the first page is at least partially congruent with the surface coating the second page. This means that both sides are coated on the web and each uncoated sections formed on both sides. At least partially congruent in this context understood that each coated section on a first page a coated section on the second side of the web is arranged. But it may be that on the second page there are additional, coated ones Sections exist. This can be advantageous if on one side of the Material web more adhesive, for example, more adhesive points, are desired than on the other side of the web. It is also conceivable to place the dots on one side of the web train larger than the dots on the other side of the web.

The coating is preferably applied to the film in a punctiform manner. As a coating For example, an adhesive made of polyurethane is used. Typically approx. 50 points per cm2 of web surface applied. The dots have a surface from 0.8 mm2 per point.

Figur 1

eine schematische Darstellung einer erfindungsgemässen Vorrichtung,

Figur 2

eine vergrösserte Darstellung der Auftragvorrichtungen einer Vorrichtung gemäss Figur 1,

Figuren 3a bis 3c

verschiedene Ausführungsbeispiele einer erfindungsgemässen Warenbahn,

Figur 4

eine schematische Darstellung eines alternativen Ausführungsbeispiels von Auftragvorrichtungen,

Figur 5

eine vergrösserte Darstellung eines Ausschnitts aus den Auftragvorrichtungen gemäss Figuren 1 und 2,

Figur 6

eine Draufsicht auf zwei Auftragvorrichtungen gemäss Figuren 1 oder 2,

Figur 7

eine schematische Darstellung eines dreilagigen Laminats gemäss der Erfindung, und

Figur 8

eine vergrösserte Darstellung eines Ausschnitts eines alternativen Ausführungsbespiels.

The invention is explained below in exemplary embodiments and with reference to the drawings. Show it:

Figure 1

2 shows a schematic representation of a device according to the invention,

Figure 2

2 shows an enlarged view of the application devices of a device according to FIG. 1,

Figures 3a to 3c

different embodiments of a web according to the invention,

Figure 4

1 shows a schematic illustration of an alternative exemplary embodiment of application devices,

Figure 5

2 shows an enlarged illustration of a detail from the application devices according to FIGS. 1 and 2,

Figure 6

2 shows a top view of two application devices according to FIGS. 1 or 2,

Figure 7

is a schematic representation of a three-layer laminate according to the invention, and

Figure 8

an enlarged view of a section of an alternative embodiment.

FIG. 1 shows a device 1 for coating a web W with a coating on both sides flowable plastic mass K.

The web W is in the running direction L around a deflection roller 8 and between two applicators 3a, 3b passed through. The web W is on both sides 4a, 4b with a Provide coating 2a, 2b.

The web W is then guided over a spreader 9 and a laminating arrangement 7 fed.

The laminating arrangement 7 essentially consists of two calenders 10a, 10b. About the calenders 10a, 10b is a material Ma and Mb for lamination from both sides of the web W the web W fed.

The flowable plastic mass K consists of an adhesive. The material Ma and Mb will with the adhesive on both sides 4a, 4b of the web W in the laminating arrangement 7 the web W connected.

The material web W consists of a breathable, waterproof film, for example Goretex or Sympatex. The materials Ma and Mb for the lamination are woven, knitted or Nonwovens, e.g. Polyester fabric or fleece.

After the lamination in the lamination arrangement 7, the web W is a three-layer laminate passed over a cooling table 14.

The coatings 2a, 2b are as partial surface coatings on the sides 4a, 4b of the Web W applied. The partial surface coating is typically a grid of points educated.

Both application arrangements have for applying the punctiform surface coating 3a, 3b on a sieve drum 6a, 6b rotatably mounted about an axis A1 or A2. The plastic material K is removed from the inside of the sieve drum through the sieve openings 11a, 11b (see FIG 2 and 5) applied to the two surfaces 4a, 4b of the web W.

To apply the plastic material K there is an application nozzle in the interior of the screen rollers 6a, 6b 5a, 5b and a doctor blade 23 are provided on a doctor blade holder 21. The squeegee holder 21 can be heated. Due to the rotary movement of the screen rollers 6a, 6b and the angle of the doctor blade 23 the plastic material passes through the sieve opening.

Around the sieve rollers 6a, 6b there is also an infrared hood 20 for heating the sieve rollers 6a, 6b provided. The infrared hood 20 is necessary so that the plastic material K in pasty State remains, so that the material through the sieve openings 11a, 11b in the sieve drums 6a, 6b on the surfaces 4a, 4b of the web W can be applied.

So that the surface coating 2a, 2b on both sides 4a, 4b of the material web W is identical the sieve drums 6a, 6b are aligned with one another.

The axes A1, A2 of the two screening drums 6a, 6b lie in one and the same plane E, which perpendicular to the web W and perpendicular to the direction L of the web W. The Axes A1, A2 can optionally be designed to be adjustable so that they are exactly in the plane E lie.

The speed of rotation of the screen rollers 6a, 6b is also adjustable, so that the screen rollers 6a, 6b rotate synchronously with each other and synchronously with the web W. The surface speed the sieve drum 6a, 6b corresponds to the speed at which the web of material W is moved forward.

The sieve drums 6a, 6b are also in the axial direction A1, A2 and in the circumferential direction U1 and U2 aligned so that the screen openings 11a, 11b in the two screen drums 6a, 6b aligned with each other when they come into contact with the web W. This ensures that at the same time on one side 4a and on the other side 4b a coated one Surface area is generated.

FIG. 2 shows an enlarged illustration of the two application arrangements 3a, 3b. Figure 2 shows how the screen openings 11a, 11b are aligned with one another in the region of the web W. The Plastic material K is liquefied inside the sieve drum 6a, 6b and through the sieve openings 11a, 11b on the surfaces 4a, 4b of the web W as partial surface coatings 2a, 2b applied.

FIGS. 3a to 3c show different embodiments of those coated according to the invention Goods web W shown.

According to FIG. 3a, for each coated surface area 2a on one side 4a Material web W on the other side 4b in the same place has an equally large, coated surface area 2b formed. The pattern of the coating 2a on one surface 4a is thus congruent with the pattern of the coating 2b on the other side 4b of the web W.

FIG. 3b shows a material web W in which each coated area 2b on the one side 4b on the other side 4a a surface area 2a is formed. On the website 4a, however, further surface areas 2a are also formed.

FIG. 3c shows a material web W at which each point 2a on one side 4a Point 2b on the other side corresponds to 4b. The size of points 2a and 2b is different, however.

In the following application, each of the terms is essentially congruent Embodiments 3a to 3c included.

FIG. 4 shows an alternative embodiment of the device according to the invention.

Instead of that, as in FIG. 1, the partial surface coating 2a, 2b directly from a Sieve drum 6a, 6b is applied to the web W, in Figure 4 is a carrier Ta, Tb intended. The plastic material K is in a grid of points on the surface of the carrier Ta, Tb given and transferred from this to the web W. The carriers Ta, Tb are as Rolls trained. The speed of rotation of the screening drums 6a, 6b and the rollers Ta, Tb are synchronized with each other and synchronized with the speed of the web W. By the Sieve drums 6a, 6b are aligned with each other, there is an indirect application of partial Surface coatings that are aligned, i.e. essentially congruent are on both sides 4a, 4b.

Of course, instead of a carrier Ta, Tb in the form of a roller, a band-shaped one can also be used Carriers as described in CH 648 497 or CH 663 310 are used.

FIG. 5 shows an enlarged representation of the sieve drums 6a, 6b according to FIG. 2 in the area the order of the plastic material K shown on the web W. The sieve openings 11a, 11b of the screening drums 6a, 6b are aligned with one another in this area. The plastic material K is therefore applied congruently on the top 4a and on the bottom 4b.

A motor is used to adjust the peripheral speed of the screening drums 6a, 6b operated quickly. For aligning the screen openings 11a, 11b in the circumferential direction U1, U2 one sieve drum 6a is moved faster than the other sieve drum 6b until the screen openings 11a, 11b are aligned. After that, the sieve drums continue with same peripheral speed U rotated. Alignment can be done visually (i.e. by observation an operator). The sieve drums can also on their surface be provided with reference markings. It is also conceivable to provide reference markings which can be detected automatically (e.g. via optoelectronics).

FIG. 6 schematically shows a top view of the two sieve drums 6a, 6b. The sieve drums 6a, 6b are rotatably supported about axes A1, A2. On the left edge of the sieve drums 6a, 6b schematically show screen openings 11a, 11b. The screen openings 11a of one Drum 6a are aligned with respect to the sieve openings 11b of the other sieve drum 6b and lie in one and the same, perpendicular to the axis A plane. Then on the screen openings 11a, 11b shown follow further (not shown) screen openings 11a, 11b, which are arranged in planes 12 running perpendicular to the axes A1, A2.

The sieve drums 6a, 6b are identical. In particular, are on both screening drums 6a, 6b an equal number of sieve openings 11a, 11b arranged at equal intervals.

So that the screen openings 11a of the one screen drum 6a lie in the same plane 12 as that Sieve openings 11b of the other sieve drum 6b are the sieve drums 6a, 6b along the axes A1, A2 slidable. The shift can be done manually or by motor.

FIG. 7 shows a flat structure G according to the invention, which is designed as a three-layer laminate is. The web W according to the invention forms a middle layer. On the one hand 4a of the material web W, a first material Ma is laminated on. On the second side 4b of the web W is laminated with a second material Mb. The material Ma, Mb consists of one Woven fabrics, knitted fabrics or a nonwoven fabric, which over the partial surface coating 2a, 2b is connected in the form of dots to the web W formed of foil. Because the Surface coatings 2a, 2b are aligned with one another on the surfaces 4a, 4b, can moisture H unhindered by gaps between the surface coatings Step 2a or 2b through.

FIG. 8 shows an enlarged section of an alternative between two applicators Embodiment continuous web shown.

The first applicator 3a is designed in the form described above and consists of essentially from a sieve drum 6a, through which the plastic mass K on the side 4a Web W can be applied.

In contrast to the exemplary embodiments described above, the second application device is 33 formed with an engraving roller 36. The engraving roller 36 has depressions 35 on, which are distributed with the same pattern over the surface of the engraving roller 36 as the screen openings 11 of the screening drum 6a.

The engraving roller 36 is guided through a bath which contains the plastic material K. With the plastic material is scraped off the surface of the engraving roller 36 using a doctor blade 34, so that the plastic material K only remains in the recesses 35. From the wells 35, the plastic material is applied to the surface 4b of the web W by contact.

In contrast to screen openings 11, the depressions 35 form a clearly defined counterpressure surface for the sieve drum 6a. This enables stable operation.

Claims (13)

Device (1) for applying a partial surface coating (2a, 2b) to a web (W), with at least one first application device (3a) for the direct or indirect application of a flowable plastic mass (K) to one side (4a) of the web or to a carrier (Ta), which application device (3a) preferably has at least a first application nozzle (5a) and a first movable sieve (6a), which is arranged between the application nozzle 5a and the web (W) or the carrier (Ta) and which can be moved synchronously with the web (W) or with the carrier (Ta), characterized in that the device (1) has at least one second application device (3b) arranged on the other side (4b) of the web (W) for the direct or indirect application of a flowable plastic compound (K) to the other side (4b) of the web or on a carrier (Tb), which preferably has at least a second application nozzle (5b) and a second movable screen (6b) which is arranged between the second application nozzle (5b) and the web (W) or the carrier (Tb), wherein the first application device (3a) and the second application device (3b) are mutually alignable or aligned, so that the first surface coating (2a) is at least partially congruent with the second surface coating (2b), preferably the second screen (6b) in synchronism with the first sieve (6a) is movable and the first sieve (6a) and the second sieve (6b) mutually in the running direction (L) of the web and / or in a direction (A) transverse to the running direction (L) of the web (W) can be aligned. Device according to claim 1, characterized in that the first and the second Sieve are formed as sieve drums (6a, 6b) which are rotatably mounted. Device according to claim 2, characterized in that the screening drums (6a, 6b) are rotatably supported about axes (A1, A2), which are perpendicular to the web in a plane (E) (W) run. Device according to one of claims 2 or 3, characterized in that the screening drums are rotatably supported about axes (A1, A2) which can be aligned with one another. Device according to one of claims 1 to 4, characterized in that the first Sieve (6a) is mirror-symmetrical with respect to the web to the second sieve (6b) is. Device according to one of claims 1 to 4, characterized in that according to the Application devices (3a, 3b) an arrangement (7) for laminating the web on both sides (W) with further material (Ma, Mb) is arranged. Device according to one of claims 2 to 6, characterized in that the screening drums (6a, 6b) can be aligned with a servo motor. Method for applying a partial surface coating on a web, in particular using a device according to one of claims 1 to 7, characterized in that a partial surface coating (2a, 2b) is applied to both sides (4a, 4b) of the web (W) ,
wherein the coatings (2a, 2b) are applied on the two sides (4a, 4b) of the web at least partially congruent with each other, so that the web (W) has sections coated and uncoated on both sides. Material web (W), in particular produced with a device according to one of claims 1 to 7 or with a method according to claim 8, with a partial surface coating (2a, 2b),
wherein the surface coating (2a, 2b) is applied on both sides (4a, 4b) of the web (W) and wherein the surface coating (2a) of one side (4a) of the web (W) is at least partially congruent with the surface coating (2b) of the second side (4b), so that the web has sections coated on both sides and uncoated on both sides. Web according to claim 9, characterized in that the web of one breathable, waterproof film. Goods web according to one of claims 10 or 9, characterized in that the Surface coating (2a, 2b) consists of points. Three-layer, laminated fabric containing a web as a middle layer according to one of claims 9 to 11. Device according to one of claims 1 to 7, characterized in that the second Application device (33) instead of a screen drum an engraving roller (36) with depressions (35) for receiving the plastic material (K).

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