DE1778600A1 - Process for the production of loose covers for upholstery or the like. - Google Patents

Description

RudolfBusselmäer Augsburg, the lh. May 1 ₉ 68

Patent attorney

Augsburg - Rehlingenstrasse 8 · Priority: Great Britain

Po »tt <hed & onto: Munich No. M53» MV. bd 5® / "7

5t35 / o ₅ ⁵

Pat on t ar in e 1 du τ; ο;

STOREY Β; 10ΐϊϊώ: ΐ3 AND COKPANY 1, Ii-IITED, White Cross, Lancaster, England

"Method for the production of loose covers.? For upholstery or the like."

The invention relates to the production of loose covers for flexible, stretchable and soft objects such as car seats, cushion covers and gepolscorte ooor padded items in general. Im einoinsn The invention relates to the production of such 3rd; trains by vacuum deep-drawing deformation, this drawing also includes the equivalent liquid-pressure method, unless something specifically stated in the text otherwise is said.

The covers according to the invention are made from a sheet or film of a plasticized polymer or copolymer of vinyl chloride. Such materials are generally referred to as PVC _ω in the present text. This slide is particularly suitable for

• ^ Production of loose covers, which have an attractive appearance

· * And should have a comfortable grip. The pleasant Φ

Appearance is achieved by embossing the surface of the cover and the pleasant feel by foaming

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the cover and the choice of a suitable embossing ..

When a PVC film is vacuum drawn, it is heated to a temperature close to its melting point so that it can be drawn into a three-dimensional shape. Dij very accurately be observed and high demands alternate operating conditions, which is subjected to the film during doa Vacuum thermoforming method, · may cause Diö film einen.wesentlichen part loses IBRC embossed. These operating conditions must be adhered to much more precisely than those which are necessary in the related process of vacuum drawing3, because there is nothing in the vacuum deep-drawing process that supports the film and holds it in its new three-dimensional shape once it has been was removed from the mold at the end of the vacuum deep drawing process. Losing the embossing obviously has disadvantages for the loose cover produced.

It is therefore an object of the invention to provide a To create a loose reference in which the loss of the embossing is eliminated during the vacuum deep drawing process or is reduced very significantly.

- * According to the invention is a loose seat cover

^? provided by vacuum deep drawing (like i

co '

σ;> defined herein) a substantially flat PVC -— * film (as described herein) is produced, the PVC film by casting a base layer cn

or based on PVC paste stamped on it, only

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5135/05 Th / Jini - 3 - - "· ^ lai 1 <; 68

Temporary 'u ^ uses c: r * tracer, which is eiii -jxx detachment -ab or -zug trajt, hcrgostei.lt by adding one or more layers of PVC-j? f "sto applied containing a propellant, wherein the compound JOlie dor heat is salted out to cause the paste to gel and allow the propellant to take effect, and the resulting film is peeled from its temporary support after its manufacture.

Dio Folie.die is used for the manufacture of d ^ s-free reference, thus has an embossed impermeable surface on one side and somewhat resilient -.-; Compressibility and, if used in the vacuum deep drawing process, it will keep its imprint even though it is heated to a temperature; where PVC becomes malleable.

The retention or maintenance of imprinting seems to follow from aor fact that the embossing is substantially unloaded and spaiinungslos when it is formed. This is not the case with rolled, embossed foils.

The temporary carrier on which the PV'C paste is poured can be in the form of an endless belt or of a certain length. He can <vu :? each

* - * desired material made up with a.-ji.-i pattern

_{ω can be} embossed or engraved in the way k & vin that it

■ *> complementary, i.e. mirror image of that one "" * · ■ is with which the slide is to be provided and on CO

the (material) a release layer is applied kaiin that allows the slide to slide easily

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5135/05 Th / Ein - k - lh. May 1968

after the gelling process "is peelable from the carrier.

Good results have been obtained with a silicone resin coated paper tape. The silicone resin can be applied and applied in a layer thickness of a few thousandths of an inch * ^{1 thickness.} Other temporary supports can also be used, for example papers or fabrics coated with a polyolefin such as polyethylene or polypropylene. Further examples are papers or fabrics that are coated with fluorinated polymers, such as polytetrafluoroethylene, also paper or fabric with oil-modified alkyd resins, and also paper or fabrics that are coated with urea or melamine-formaldehyde resins that are plasticized with alkyd resins , or papers and fabrics coated with alginate compounds;

The propellant may be one of those already known that, rden active w _e at temperatures at which PVC gelled. "

A typical example is sold by Whiffen & Sons Ltd. under the name "GiSNITRON AC ^{TI (probably an azodicarbonamide).}

The PVC can be heated up by placing the film under radiant heaters and / or through an oven.

⁴ ^ "If the paper or some other temporary

Carrier from the composite, embossed, aufotriobenon and the gelled folio is stripped off, the freshly embossed surface may feel a little sticky

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5135/05 Th / iSm - 5 - PY. Shark I968

feel. If a dry grip is necessary, the release-coated surface likes of the carrier are first coated with a varnish, which ensures that in the end a non-tacky Surface is created. Under the. Substances that are suitable for this purpose have a solution or emulsion of an acrylic resin, an unplasticized one Polymer or copolymer vinyl chloride with high Molecular weight or a cellulose derivative or mixtures thereof. .

According to the invention, the loose references can therefore can be made by adding a release liner embossed temporary Backing paper runs out:

1. Coating with lacquer

2. Drying the paint (possible, not necessary)

3. Coating with an initial layer of flat PVC paste

k. partial or complete gelling

(possible but not necessary) 5. Coating with expandable PVC paste 6. Gelling and expanding 7 · Vacuum forming of the resulting film.

The invention is now based on execution Q embodiments with reference to the drawings schematischon OO calculations described. Show it:
0) Fig. 1 shows the production of foils, "" * Piff · 2 an enlarged section through the her-

φ ■ asked sheet material, Fig. 3, a device for the vacuum deep-drawing

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5135/05 Th / Jäm -. 6 - \ k. May 1968.

A paper tape 10 provided with embossing (see FIG. 1), which forms the temporary carrier and has a release layer made of silicone resin, is unrolled from a roll 12 and drawn through the system. This paper 'is provided with a pattern \ showing the reversal or Negativförm of that pattern which

• * ■

• should receive the final slide.

The tape is first drawn over a roll Xk ,

W where it is coated with a thin layer of varnish I5

which is applied to the release layer of the paper. This paint can, for example, a Be a solution of an acrylic resin. The thickness of the lacquer layer is adjusted with a stripper 16. Of the Lacquer is then dried on the belt by allowing the solvent to escape and by allowing the solvent vapors has been removed by a trigger 18.

The lacquer-coated paper tape is then coated with a thin layer 19 of PVC paste 20 which does not contain any propellant. This is done by "■ 'is passed \ the tape over a roller 21 under a doctor blade 22nd Before this layer,

gels, another layer 23 of PVC paste 2h j

• ■ i

applied to position 19. The PVC paste 2k ent-O ■ holds a propellant and is applied by a counter-rotating roller coater 25. The two layers 19 and 23 are then gelled and the layer is blown up by moving it under a heater 26.

co · ■ ·. · ■. ·

O * run up. In this way, a cast becomes distended Foil 28 is formed, which is carried by the belt 10

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17786Q0

After foiling, the film 28 is cooled by running over a cooling roller 30 and the finished film 28 is pulled off the paper tape 10 and rolled up on the roll 32. The paper tape is> »rolled up on the Holle 3't.

As best seen in Figure 2, the embossed finished sheet 28 has an impermeable surface formed by the base layer 19 and as a whole is resilient, resilient and compressible because of the inflated layer 23. Also, there is use of the lacquer coating 15 of the embossed surface of the film 28 is not sticky, but rather dry and soft to the touch.

Although in Fig. I the application is only one single layer 23 of an inflatable PVC paste is shown, more than one layer or Layer are applied. The PVC layer 23 can also be gelled or fused and expanded, before another layer is applied. as well the base layer 19 can be gelled or fused before the expandable PVC layer 23 is applied.

As it is written above, is the paper tape

- * 10 embossed before it is covered with a layer of varnish 15

■ will see. This order is not necessary. Co

- ^ ' The way and' ./siso, in which the different -4 layers of PVC-Prste and varnish are applied,

* "does not have to be necessaryerei.-i.se .so i-oin, v.-ie>; s in Fig .:

dcirgos t j.llt is. You can boi. sniol. swnise through> ^v ii.

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Scraper knife or a counter-rotating roller applicator are distributed as shown, but they can also be applied by spraying will. · ''

"After the slide 28 has been completed, it can be used to produce a loose cover, according to the invention by vacuum deep drawing is given a three-dimensional shape in a form. A suitable deep-drawing device 36 is shown in FIG shown.

In this device, the film 28 is held tightly above a vacuum container 38, from which the air can be sucked out very quickly through lines 40. Initially, these lines are closed by a valve, not shown, while the film with the help of Heizeinric.htungen h2. is heated so that it can be deep drawn. The heating devices h2 are attached either above the foil, as shown, or below the folio. The sealing of the conduits ensures that the film retains its substantially flat shape during heating. This phenomenon is supported by the enclosed air.

In the vacuum deep-drawing process, the film must be up to to a very high temperature near their melting point be heated up so that they are sufficient

can be stretchable and stretchable in order to be shaped z * uV

uni] i! i, - ■ lu-'Ui ¹ form to mock up 1 tone, nae kuoin ₄ s io from dor

109836/1196

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5135 / 05th th / 3m - 9 - lh. May 1968

Shape has been removed. Normally, the PVC film will have to be heated ^{up to a temperature of around 10 0.} During this heating process, a foil rolled in the usual way with a calender loses most of the impressions.

After the film is sufficiently stretchable and compressible, it is drawn over a mold k ^l i , which is arranged within the vacuum container 38, in that air is drawn out through the lines 40. In this way, the film is given the desired three-dimensional shape. After the deformed film has cooled sufficiently that it can retain its shape, the lines h0 are connected to the atmosphere or a source of compressed air and the formed film is removed from the mold and cut to the desired size. The finished cover has then attained the desired shape and size and has also retained the greater part of its embossing, although it has been heated to close to its melting point.

The vacuum drawing process described can be altered using either one or more of the steps commonly known as "plunger assist ¹¹ " and "bubble forming".

Furthermore, the shape VI can have a first cover made of an underlay material, such as knitted or knitted fabric, so that a pull can be made .

5 * 35/05 Th / JSm - 10 - tk < May

ion of the type described in British Patent No. 1,023 δ8θ.

It has been found that an advantageous application of the loose covers produced in this way consists in introducing a foamable connection, for example a polyurethane compound, into the loose covers and then heating the whole thing to such an extent that the connection is treated and foamed in such a way that it Forms filling for the loose cover in place and that the two are connected together. Upholstered parts produced in this way can advantageously be used as cushions for a car or vehicle seat with a rigid frame.

- 11 - Claims -

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Claims (1)

5135/05 Th / Iiin * i'i. wai I968 Patent claims: 1. Process for the production of an essentially flat folio for one to be shaped by vacuum deep-drawing loose seat cover, characterized in that a first layer (I9) made of polyvinyl chloride paste (PVC paste) (20) at a time-. We'iligen embossed carrier (10) .with a detachment is applied by the carrier lightening layer, on which (19) one or more further, a propellant containing layers (23) of PVC paste (20) have been applied, the composite film being the Exposure to heat to gel the paste and cause the propellant to take effect, wobai the resulting film can be peeled off from its temporary support, or is peeled off. 2. The method of claim 1, characterized GEK e η η - is characterized in that an adhesive to PVC coating layer is formed on the peeling-facilitating layer is applied before the first layer (I9) of PVC-paste (20) on the temporary support (10 ) is applied. 3. The method according to claim 2, characterized in that the Lac'k (tp) consists of an acrylic resin consists. k. Method according to Claim 2, characterized in that u <ir is varnish. a non-plasticized vinyl chloride polymorod ■ Vj ny 1 .chlorii '.- Copoly-Hi er with high molecular weight hos ti hu. 109836/1196 BATH 5-135 / 05 Th / Em - 12 -. lh. May 1968 5. The method according to claim 2, characterized in that g e k e η η that the lacquer (15) is a cellulose derivative. 6. Method of making a pad with a Seat cover from the after one? or more of the preceding claims produced film, characterized labeled ^ that in the loose seat cover a pre-foamable compound is introduced, k the treated, e.g. heat-treated, vulcanized or the like. And foamed • 'is. 7. The method according to claim 6, characterized in that the foamable compound is a polyurethane compound. . 8. Foil for the production of a vacuum deep-drawing process loose seat cover to be molded, thereby characterized in that it consists of a first layer (19) of polyvinyl chloride which applied to a temporary support with a layer facilitating removal from the support (10) has been, further from one or more additive · * · borrowed, blown up and gelled layers (23) of PVC (20) by blowing agents, the film of is removable from its temporary carrier (10) 9. Foil according to claim 8, characterized in that that they have one on the underside of the first layer (19) made of PVC, the upper side of which has one or more, additional layers (23) carries, adhesive lacquer layer having. 109836/1196 BAD original '" ¹³ ~ S Th / iiiii - 13 - I ';. Times x'J> o3 10. Folio after. Claim 9t characterized by g e k e η η that the paint consists of an acrylic resin. 11. Film according to claim 9 »characterized in that the lacquer (15) consists of one not plasticized cfi vinyl chloride polymer or High molecular weight vinyl chloride copolymer. 12. Film according to claim 9i, characterized in that the lacquer (I5) is a cellulose derivative is. 13. Upholstery with a seat cover made of a film according to one or more of claims 8 to 12, characterized in that the seat cover a treated, e.g. heat-treated, vulcanized one that completely or partially fills the interior space Or the like. And foamed connection. Ik. Upholstery according to claim 13, characterized in that the foamed connection • is a polyurethane compound. 109836/1196 bad original