DD292627A5 - METHOD FOR THE PRODUCTION OF FLOOD, FLUID MATERIALS - Google Patents

Abstract

The invention relates to a method for producing a flocked web material whose carrier material consists of a film, preferably PVC soft film. By this method, a flocked web material with low technological, constructive and energetic effort to be produced. The goal is achieved by the immediate adhesive-free application of the flakes to the still active web material. extrusion; Thermoplastic; PVC; flocking; Production method}

Description

field of use

The invention relates to a method for producing a flocked web material whose carrier material consists of a film, preferably PVC-soft film.

Characteristic of the known state of the art

When flocking surfaces, a batt is applied to the previously coated with adhesive, still wet substrate and then fixed by Klebstoffverfjstigung IBersev; Liebscher, "Electrostatic flocking" VEB technical book publishing house Leipzig, 1983). ..

In general, this technically applied method has the following disadvantages:

- Use of an adhesive even with Foliebeflockung

- Use of z.T. Solvent-containing adhesives

• Solvent or plasticizer recovery systems required or exhaust air cleaning

• workplace and environmental impact

- Drying process necessary

• Equipment costs for dryers

• Energy expenditure for drying

- Machine speed is critically dependent on the duration of the drying process

Special methods of adhesion promotion are protected in FRG Patent Nos. 1936154 and 1906678. After tackification of the supplied plastic sheets by solvent or plasticizer action and subsequent flocking the sheets are flocked anchoring and cooled again.

This is dispensed with a special adhesive. However, the other above-mentioned disadvantages also remain here, the energy required for the melting is with high probability even higher than that for the dryer, an adhesive necessary.

Object of the invention

The invention is to be produced with little technological, constructive and energetic effort material-saving and umv Itentlastend flocked web material.

Essence of the invention

The object of the invention is the continuous flocking of a nonwoven sheet material without the use of adhesive for anchoring the flakes.

According to the invention, this object is achieved by a method in which a flat interim carrier material is homogeneously applied to the desired flocking on the end product, while the flocking forming material is anchored with dincr force on the interim carrier material, which is smaller than the anchoring force on the final product , Thereafter, this applied Interimsträgermaterial is guided in the vicinity of the slot of a slot die, where an intimate copulation between the exiting from the slot die, still active and the flocking side of the applied Interimsträgermaterials brought and pressure is exerted on this composite.

As the copulation between film and Interimsträgermaterial supporting, pressure-exerting agent, the implementation of this composite thus produced is preferably carried out through a nip. The term "still active film" means that the film emerging from the extruder must not yet be solidified until it is copulated. After the pressure has been exerted, the activity of the film ceases due to cooling, which can be further assisted by the Bonding is conducted through a heat exchange zone and there is a divorce between the film now being flocked and the temporary carrier material In the divorce of this composite, the different anchoring force of the flocking described above is exploited so that the flocking is completely absorbed by the temporary carrier material The divorce is preferably effected by diverging the fabric web with winding, to generate the anchoring force on the interim support material, an electrostatic charging of the same and / or application of a negative pressure, wherein in the case of electrostatic charging the carrier then v Preferably consists of a well chargeable polymer film. The temporary carrier material is preferably reused.

As a temporary carrier material also a flocked polymer film, which is electronically charged, can be used. This process makes it possible, with little effort, without glue, to produce eco-friendly, flocked sheet material with little energy expenditure.

embodiments

1st embodiment

A Mahlflock of bleached viscose fibers, which have an average fiber length of 0.3-0.5mm, and the

Achieving a high flocculation is treated by the known methods of mechanical flocking on

Polyamide fiber fleece, which has a thickness of 2 mm, so flocked that on the nonwoven a uniform flake coverage of 70g / m ² is formed. The flake field has a length of 2 m. The effective web width is 1 m, the web speed is 15 m / min. At the end of the field of flakes, a suction box with a width of 30 cm, which is completely covered by the fleece, is mounted underneath the material web.

From the suction box by means of water ring pump before an amount of air. 100m ³ / h sucked off. The Polyamidfasei fleece is formed as an endless belt. The flocked polyamide fiber fleece becomes one

Extrusion coating plant supplied where the flocked side is pressed in the nip with a leaked from an extrusion die & with a melt temperature of 18O ⁰ C PVC-W film with a line pressure of 300 N / cm.

The PVC-w film has a mass of 200g / m ² during prepressing. The laminate is cooled to 3O ⁰ C, then the polyamide fiber fleece is delaminated.

Polyamide fiber fleece and the flocked PVC-W film are removed by brushing and sucking loose viscose fibers.

The flocked PVC-soft film is printed on the back of a rotogravure printing system. .

The product obtained is used as a table top.

2nd embodiment

A Mahlflock of brown colored viscose fibers with an average fiber length of 0.3-0.5mm, which with 2.5MT

Soda and 4.5 MT aluminum sulfate is flocked according to the technological conditions in Example 1, wherein im

Flockenfeld a temperature of 150 ° C prevails and the fibers are heated to 150 ° C.

It is set to a mass of flakes of 70g / m ² .

The web speed is 15 m / min.

The carrier material used is a viscose fiber fleece of 2 mm thickness, which was equipped with Marvelan FS, in particular by VEB Fettchemie Karl-Marx-Stadt. The flocked Viskosefaservlies is fed to an extrusion coater, where the flocked side at a temperature of at least 130 ° C in the nip with a beaten from an extrusion die with a melt temperature of 17O ⁰ C PVC hard film with a line pressure of 300 N / cm »pressed becomes.

The PVC hard film has a mass of 150g / m ² during prepressing. The laminate is cooled to 3O ⁰ C, then the Viskosefaservlies is delaminated.

Viscose fiber fleece and the flocked PVC hard film are removed by brushing and vacuuming loose viscose fibers.

The product obtained is used as a thermoformable decorative film.

3rd embodiment

Polyamide short fibers of 1 mm length and a fineness of 0.33tex are mechanically flocked by known methods with an area coverage of 80g / m ² on an endless, 0.5 mm thick polyethylene film previously with a high-speed, polyamide-coated roll to 20kV / was electrostatically charged. The flocked polyethylene film is coated, laminated and cleaned in accordance with Example 1 with a PVC soft film.

The flocked PVC-soft film is printed on a gravure printing line and embossed on an embossing machine, the product obtained is used as a lightweight upholstery leather.

4th embodiment

Pretreated short fiberglass fibers of 1 mm in length are mechanically flocked by known methods with a surface coverage of 150 g / m ² onto a 0.5 mm thick PVC-soft film flocked with polyamide fibers (adhesive Wilbraflock 76) whose fibers have been previously treated with a high-speed glass roller at 20 kV / cm electrostatically charged. The flocked PVC-soft film is coated according to Example 1 with a PVC-soft film, dalaminiert and cleaned. The product flocked with glass fibers is printed on a Rastertiefdruckanlago and is used as a flame-retardant and sound-absorbing decorative film use.

5. Description of the application

On a polyamide fiber fleece sieved, cleaned sea sand of grain size <0.2 mm is sprinkled evenly with an area coverage of 300g / m ² and fed to an extrusion coating plant at 15m / min.

The sandbestreute side of the web is pressed in the nip with a leaked from an extrusion die with a melt temperature of 180 ⁰ C PVC w film and a polyester fabric of 130 g / m ² with a line pressure of 300 N / cm so that the PVC -w movie is located between sand and tissue.

The PVC-w foil has a basis weight of 100 g / m ² during pressing. The laminate is cooled to 3O ⁰ C and delaminated polyamide fiber fleece.

Polyamide fiber fleece and the composite sand / PVC-w film / Gewebo are freed by brushing and suction of loose sand.

The product obtained is used as a wallpaper. ^N

Claims (6)

claims: 1. A method · \ τ producing a flocked sheet-like web material, the support material preferably consists of soft PVC film, characterized in that a flat interim carrier material homogeneously, is applied to the desired on the final product flocking, this with a force in the interim carrier material is anchored, which is smaller than the anchoring force of the flakes on the final product, then guided this acted interim carrier material in the vicinity of the slot of a slot die and an intimate copulation with the emerging from the slot die still active foil and the side of the Interimsträgermaterials on which the Flocking is brought about, after which pressure is exerted on this composite and a cooling is carried out and extinguished after extinction of the activity of the extra-soft film, which is done by cooling, and now the flocking film from the Interimsträgermaterial will be. 2. The method according to claim 1, characterized in that for generating the pressure, which is necessary to support the copulation between extruded film and actiied Inierimsträger, the composite is passed through the slot of a pair of rollers. 3. The method according to claim 1, characterized in that after the pressurization of the composite is passed through a heat exchange zone. 4. The method according to claim 1, characterized in that the divorce of the composite durcdh divergent web guide is made with winding. 5. The method according to claim 1, characterized in that a Viskosev'ies is used as Interimträgermaterial, elks has been equipped with anti-adhesive or provided. 6. Verfahrt «according to claim 1, characterized in that the anchoring force on the Interimsträgermaterial by the same electrostatic charge jnd / or by applying a negative pressure is generated.