DE102007002623A1 - Method for producing seat shells - Google Patents

Abstract

The method involves gluing the several layers of the seat shell together using pressure and heat. It involves providing at least one of the two outer layers of the seat shell with flocking on the exterior surface prior to gluing to the other layers over at least part of its surface while still flat.

Description

TECHNICAL AREA

The The present invention relates to a method for producing curved, multi-layered seat shells in particular of chairs, at which the multiple layers of the seat using pressure and heat be glued together.

STATE OF THE ART

The Gluing the individual layers takes place in large presses, wherein the layers from their next flat Form at the same time in the desired curved final shape of the seat to be pressed.

When Material for the layers are mostly used wood veneers, in which case the seat shells as Wooden press shells or referred to as plywood shell molds. For the outside Layers are also happy to high-pressure laminates (HPL = High Pressure Laminates) used, if necessary, colored and with synthetic resin such as melamine impregnated Kraft papers exist, because they have very good and durable surface properties. The surface does not have to be aftertreated in this case. melamine withstand works well with ordinary wood glue.

For pressing pressures between 100-200 N / cm ² , in particular of 200 N / cm ² , applied at temperatures between 60-100 ° C.

The thus produced seats are superficially smooth and therefore quite slippery. Admits is the application of an anti-slip on the Seat, but what a retrospective Operation required.

PRESENTATION OF THE INVENTION

The Invention has set itself the task of a rational method for Production of an improved seat shell of the aforementioned Specify type that is not slippery at least in the area of the seat which looks good and appealing.

The solution This object is according to the invention is that at least one the two outer ones Lay the outside of the seat shell before sticking to the other Layers in the still flat state at least partially provided with a flocking becomes.

method for flocking are state of the art. For flocking becomes the flocking layer provided with an adhesive, after which fibers be applied to this adhesive application. Under the effect electrostatic forces The fibers align themselves vertically on the adhesive application and when setting or during the solidification of the adhesive in this Fixed position. The result is a velvety surface.

As surprisingly flocking, the flocking is and heat treatment in the press for gluing the several layers as good as not impaired and keeps practically 100% of its beneficial properties.

For the adhesive application must in the context of the inventive Procedure a sufficiently heat-resistant adhesive which is used by the applied during the bonding of the layers Heat not impaired becomes. Suitable for this In particular, two-component adhesives are the heat resistance greater than 100 °. The fibers used must of course, too be sufficiently heat resistant. For use in the context of the inventive method are suitable in particular fibers of a polyamide such as. B. polyamide 6.6, which have this property.

The Application of the adhesive as well as the fibers is to be flocked by the "flat state" of the Situation substantially relieved, whereby the term of the "flat state" also a one-dimensional curved state of the situation should include, so that the location z. B. as a sheet of paper in a printer deflected around a roll while being coated with the adhesive and / or the fibers.

Of the Adhesive application can be achieved by brushing or spraying over the entire surface be applied to the flocking situation. However, it is preferred only part of the area applied, which is particularly suitable for the screen printing process. It can too decorative surface pattern and with a suitable choice of color of the fibers and interesting to be flocked location Color contrasts are generated.

As has further been found, as a material for the zu Flocking / n Lage / n a high-pressure laminate of the type mentioned z. B. be used with a thickness between 0.3 and 0.9 mm. For only partial area Flocking has the advantage of having the exposed, non-flocked areas the good surface properties have this material and require no post-treatment.

By flocking results, as already mentioned, a decorative, velvety surface, the flocking very thin with a thickness of z. B. only about 1 mm can be performed. However, if necessary, the flocking layer can also be substantially thicker, e.g. B. to 4 mm thick, running. The thickness depends on the length of the fibers, wherein the fibers in the context of the inventive method z. B. may have a length between 0.5-4 mm and a thickness of 1-20 dtex. Particular preference is given to fibers of about 1 mm in length and about 3.3 dtex in thickness.

The Flocking of the type considered are extremely durable, hard-wearing and abrasion resistant and are good upholstery fabrics in the load capacity and Durability not after. They have air conditioning, are light to clean, waterproof, skin-friendly, protective and equal tolerances out. They contain enough Air to prevent sweating, which is special on seat shells Meaning is.

BRIEF EXPLANATION OF THE FIGURES

The Invention is intended below with reference to embodiments in connection closer to the drawing explained become. Show it:

1 the process of flocking;

2 in a partial section, several layers of a seat before their bonding, the top layer is flocked;

3 the layers of 2 inserted in an open press; and

4 under a) -d) finished seat shells with different flocking patterns.

WAYS TO PERFORM THE INVENTION

In 1 designated 1 a layer of a thin high pressure laminate (HPL) based on several kraft papers impregnated with melamine resin. The individual layers of the high-pressure laminate are not shown. The thickness of the situation 1 is for example 0.6 mm. The location 1 could be a so-called endless web, the i 1 from left to right through the area shown and z. B. unrolled in front of the illustrated area of a roll and cut to the right behind the area shown in individual pieces.

With a squeegee 2 will the location 1 by spreading the entire surface with an adhesive application 3 provided and so coated under a fiber application device 4 moved through. With the application device 4 become short, negatively charged fibers 5 evenly on the lying at a positive potential situation 1 applied. The electrostatic charge causes the fibers to align 5 parallel to each other perpendicular to the position 1 out. With the setting or curing of the adhesive of the adhesive application 3 become the fibers 5 fixed. Excess, unfixed fibers 7 Finally, by suction with a Saugvorichtung 6 away. On the location 1 results in a velvety flocking 8th ,

2 shows a location 1 with a flocking 8th as the topmost layer of a package from a total of 7 unrelated layers, with the flocking 8th outside is. At the total with 9 designated inner layers are, for. B. to thin wood veneers with a thickness of z. B. 1.2 mm. The lowest location 10 could like the top consist of a high-pressure laminate, but this outside instead of flocking z. B. with a printed or colored decorative layer 11 is provided. However, flocking would also be possible here.

From the several layers of 2 can z. As by gluing using pressure and heat in a molding press 12 a seat shell 14 z. B. are made for a chair. 3 schematically shows such a press 12 in the still open state, in which a package 13 from several layers according to 2 is inserted. The glue required for bonding between the layers is not shown. The thin and thus flexible layers adapt when inserted into the press essentially already to their desired final shape.

4 shows under a) a finished seat 14 with seat 15 and backrest 16 How it works by gluing the package 13 in the molding press 12 from 3 results. The seat shell 14 is one-sided full surface, on the top of the seat 15 and the front of the backrest 16 , with a flocking 8th Mistake. The before gluing on the topmost layer 1 applied flocking 8th was through the pressing process in the press 12 not impaired.

A full-surface flocking on the seat 15 and backrest 16 results rationally with the in 1 illustrated application method for the adhesive application 3 (which would also produce a striped pattern). For seats of chairs, however, it may be sufficient if only a part of them such. B. only the seat 15 provided with a flocking. 4 shows under b) a corresponding embodiment. In c) and d) shows 4 two more examples where on a subarea like the seat 15 a merely partial flocking pattern is applied, namely in the form of several strips in 4c) and in the form of a dot pattern in 4d) , For these embodiments, for the application of the adhesive application another application technique such. As the screen printing technique can be used, in which persistent patterns are produced.

at all embodiments can contrast the flock color in contrast to non-flocked surfaces.

1

location a thin one High-pressure laminate

2

doctor

3

adhesive application

4

Fiber applicator

5

fibers

6

suction device

7

Not fixed fibers

8th

flocking

9

inner Layers (Holzfuniere)

10

lowest location

11

decorative layer

12

molding press

13

package

14

seat

15

seat

16

backrest

Claims (9)

Method for producing curved, multi-layered seat shells ( 14 ), in particular of chairs, in which the plurality of layers ( 1 . 9 . 10 ) of the seat are glued together using pressure and heat, characterized in that at least one ( 1 ) of the two outer layers ( 1 . 10 ) of the seat pan ( 14 ) on the outside before gluing with the other layers ( 9 ) in the still flat state at least partially with a flocking ( 8th ). Method according to claim 1, characterized in that the layer to be flocked ( 1 ) on its side to be flocked with an adhesive application ( 3 ) and that fibers ( 5 ) flocking ( 8th ) by electrostatic forces on this adhesive application ( 3 ) are applied. Method according to claim 2, characterized in that as fibers ( 5 ) Fibers, in particular polyamide fibers, with a length between 0.5-4 mm, preferably of 1 mm, and with a thickness of 1-20 dtex, preferably of 3.3 dtex, can be used. Process according to claims 2 or 3, characterized in that the adhesive application ( 3 ) is applied on the surface and preferably in area patterns by screen printing. Method according to one of claims 2-4, characterized in that for the adhesive application ( 3 ) a heat-resistant adhesive is used, which is not affected by the heat applied in the bonding of the layers and which is in particular a two-component adhesive with a heat resistance greater than 100 °. Method according to one of Claims 1-5, characterized in that for the layer (s) to be flocked ( 1 ) a Hochdurcklaminat is used. Method according to Claim 6, characterized that the high-pressure laminate is impregnated with melamine resin. Method according to one of claims 1-7, characterized in that for at least one inner layer ( 9 ) Wood veneer and a wood glue is used for the gluing of the layers. Method according to one of claims 1-8, characterized in that for the bonding of the layers, a pressure of 1-3 N / mm ² , in particular of 2 N / mm ² , is applied.