EP1160016A2 - Device and method for applying a partial coating and breathable film with such 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 breathable, waterproof film and a film with such partial surface coating with the features of the generic term of 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 film. The film is over the adhesive spots with the substrate connected. Such fabrics come for example as breathable textiles Clothing for use.

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 create partial surface coatings on both sides of a film, so that the film can be laminated on both sides. Another object of the invention is in creating a film with a double-sided, partial surface coating. A Another object is a device for producing three-layer fabrics with a medium, breathable layer as well as such three-layer fabrics.

The surface coating on both sides should not impair the breathability of the film. In addition, the textile handle of the film should be compared to films laminated on one side not be deteriorated.

According to the invention, these tasks are carried out with a device and with a method with a film and with a 3-layer fabric with the characteristics of the characteristic 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 to one side of the film or to a carrier on. The first application device preferably has at least one first application nozzle and one first movable sieve. The movable sieve is between the application nozzle and the film or arranged between the application nozzle and the carrier. The first sieve is in sync with the Foil or movable with the carrier.

When applied directly, the flowable plastic mass is passed directly through the sieve onto the Foil 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 film. Under application nozzle is in connection with 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 film at least one second application device arranged on the other side of the film. The the second application device is used for the direct or indirect application of the flowable plastics material on the other side of the film 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 film are at least partially congruent are. This device can advantageously be partially produced on both sides Use coated, breathable and waterproof film.

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 film or between the second application nozzle and the carrier. The second Sieve can be moved synchronously with the first sieve. In addition, the first sieve and the second sieve mutually in the running direction of the film and / or in a direction transverse to the running direction of the film alignable or aligned. With the alignable arrangement of the first and the second sieve the partial surface coating on one side of the film is congruent with the partial surface coating can be applied on the other side of the film. On In this way, coated or uncoated surface sections are provided on both sides of the film generated. The breathability of the film coated on both sides is therefore a comparison does not affect the breathability of a film coated on one side only. Likewise the handle of a 3-layer laminate with a medium film according to the invention is clear better than a film with non-congruent coatings on one side Foil or comparable to the handle of a film coated only on one side. It is also conceivable to provide other order arrangements that have a congruent coating on both sides allow. Instead of seven, e.g. Gravure rollers are used that serve to accommodate the plastic material and which 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 producing the screen roller based on the previously engraved 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.

The film is typically a breathable, waterproof film, such as. B. Goretex or Sympatex used. In this context breathable and impermeable means that the film lets water vapor through to a certain extent and that the film with normal use e.g. is waterproof as a garment.

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 from the sieve drums onto the film. The film runs between the two screening drums through it. The two screening drums are arranged so that their axes are in one Lay plane perpendicular to the slide. The sieve drum on one side of the film is used at the same time as a pressure roller for the other screening drum on the other side of the film.

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

The orientation of the sieve drums in the running direction of the film can be selected by a suitable choice Rotation 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 move synchronously with each other. For aligning the one screen with respect to the other screen (in the circumferential direction or Direction of movement) the movement speed can be selected differently until the sieves are aligned with each other. Aligned in this context means that the Sieve openings of the one sieve 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 produced on both surfaces of the film. It 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 the film.

The device has arranged in the running direction of the film after the application devices Arrangements for laminating the film on both sides. This results in a device for the production of triple laminates (three-layer fabrics).

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 film 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 film. The surface coatings on both sides of the film are applied so that they are aligned with one another, that the film is coated on both sides and uncoated on both sides having. The partial surface coating on one side of the film is at least partly congruent with the partial surface coating on the other side of the Foil.

The film according to the invention is advantageously used with a device and with a method in of the form described above. But there would also be other procedures and Devices for producing such films are conceivable. The film faces on both sides a partial surface coating. The surface coating is according to the invention the first side is at least partially congruent with the surface coating of the second Page. Sections are coated on both sides and uncoated on both sides educated. In this context, at least partially congruent is understood that to each coated section on a first side of the film on the same Place a coated section on the second side of the film. But it can that there are additional coated sections on the second page. This can be advantageous if on one side of the film more adhesive, for example more Glue dots are desired than on the other side of the film. It is also conceivable that Make points on one side of the film larger than the points on the other side of the Foil.

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 film surface applied. The dots have a surface area of 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 Folie,

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 Ausführungsbeispiels.

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

Figure 1

1 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 film 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 film W on both sides with a flowable one Plastic mass K.

The film W is in the running direction L around a deflection roller 8 and between two application devices 3a, 3b passed through. The film W is coated on both sides 4a, 4b 2a, 2b provided.

The film W is then passed 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, a material Ma and Mb is laminated from both sides of the film W. the film W fed.

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

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

After lamination in the lamination arrangement 7, the film 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 Foil 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 film 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 can be applied to the surfaces 4a, 4b of the film W.

So that the surface coating 2a, 2b on the two sides 4a, 4b of the film W is congruent 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 film W and perpendicular to the running direction L of the film W. Axes A1, A2 can optionally be designed to be adjustable so that they lie exactly in plane E.

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 film W. The surface speed the sieve drum 6a, 6b corresponds to the speed at which the film W moves forward becomes.

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 align with each other when they come into contact with the film W. This ensures that a coated surface area on the one side 4a and on the other side 4b at the same time is produced.

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 film 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 film W as partial surface coatings 2a, 2b applied.

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

According to FIG. 3a, for each coated surface area 2a on one side 4a Foil W on the other side 4b in the same place 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 film W.

In FIG. 3b, a film W is shown, in which there is one on each coated area 2b Side 4b on the other side 4a a surface area 2a is formed. On page 4a are but further surface areas 2a are also formed.

FIG. 3c shows a film W in which each point 2a has a point on one side 4a 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 film W, a carrier Ta, Tb is provided in Figure 4. The plastic material K is applied to the surface of the carrier Ta, Tb in a dot matrix given and transferred from this to the film W. The carriers Ta, Tb are designed as rollers. The rotation speed of the sieve drums 6a, 6b and the rollers Ta, Tb are synchronous to each other and in synchronism with the speed of the film W. By the sieve drums 6a, 6b are aligned with each other, there is an indirect application of partial surface coatings, aligned to each other, i.e. essentially congruent 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 of the application of the plastic material K shown on the film W. The sieve openings 11a, 11b of the Sieve drums 6a, 6b are aligned with each other 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 distances.

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 film W according to the invention forms a middle layer. On the one hand 4a the Foil W is a first material Ma laminated. On the second side 4b of the film W is a second material Mb laminated. The material Ma, Mb consists of a woven, knitted fabric or a fleece, which over the partial surface coating 2a, 2b in the form of Points is connected to the film W formed from film. Because the surface coatings 2a, 2b are aligned with one another on the surfaces 4a, 4b, moisture H can be unhindered pass through spaces between the surface coatings 2a and 2b.

FIG. 8 shows an enlarged section of a film passing between two application units of an alternative exemplary embodiment.
The first applicator 3a is designed in the form described above and essentially consists of a sieve drum 6a through which the plastic mass K can be applied to the side 4a of the film W.

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 film 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 (11)

Device (1) for applying a partial surface coating (2a, 2b) to a breathable, water-impermeable film (W),
with at least one first application device (3a) for the direct or indirect application of a flowable plastics material (K) to one side (4a) of the film 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 film (W) or the carrier (Ta) and which can be moved synchronously with the film (W) or with the carrier (Ta),
The device (1) has at least one second application device (3b) arranged on the other side (4b) of the film (W) for the direct or indirect application of a flowable plastic compound (K) to the other side (4b) of the film or to one Has 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 film (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 film and / or in a direction (A) transverse to the running direction (L) of the film (W) are alignable, and preferably
after the application devices (3a, 3b) an arrangement (7) for laminating the film (W) on both sides with further material (Ma, Mb) is arranged. Device according to claim 1, characterized in that the first and second sieves are formed as sieve drums (6a, 6b) which are rotatably mounted. Apparatus according to claim 2, characterized in that the screening drums (6a, 6b) are rotatably mounted about axes (A1, A2) which run in a plane (E) perpendicular to the film (W). Device according to one of claims 2 or 3, characterized in that the screening drums are rotatably mounted 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 screen (6a) is mirror-symmetrical with respect to the film to the second screen (6b). Device according to one of claims 2 to 5, characterized in that the sieve drums (6a, 6b) can be aligned with a servo motor. Method for applying a partial surface coating to a breathable film, in particular using a device according to one of claims 1 to 6,
characterized in that a partial surface coating (2a, 2b) is applied to both sides (4a, 4b) of the film (W),
wherein the coatings (2a, 2b) on the two sides (4a, 4b) of the film are applied at least partially congruently with one another, so that the film (W) has sections which are coated and uncoated on both sides and that the film is then immediately laminated on both sides . Breathable, water-impermeable film (W), in particular produced with a device according to one of claims 1 to 6 or with a method according to claim 7, with a partial surface coating (2a, 2b),
wherein the surface coating (2a, 2b) is applied to both sides (4a, 4b) of the film (W)
and wherein the surface coating (2a) of one side (4a) of the film (W) is at least partially congruent with the surface coating (2b) of the second side (4b), so that the film has sections coated on both sides and uncoated on both sides. Film according to one of claims 10 or 9, characterized in that the surface coating (2a, 2b) consists of dots. Three-layer, laminated fabric containing a breathable, middle layer Water-impermeable film according to one of claims 8 to 9. Device according to one of claims 1 to 6, characterized in that the second application device (33) instead of a screen drum has an engraving roller (36) with recesses (35) for receiving the plastic material (K).

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