DE1504258A1 - Process for the production of furniture, in particular seating furniture made of foam plastics - Google Patents

Description

Process for the production of furniture, in particular from seating furniture Foam plastics The use of hard foam plastics for construction of seating furniture of all kinds is known. It is generally adopted that Molded parts made of hard foam to improve the utility and to increase it the comfort afterwards with soft foams by covering and sticking be padded. In a final step, the seat covers are made from textiles applied of all kinds. There is also the option of pre-made, with soft To pull foam-covered textile casings over the molded foam body. It So the furniture body becomes modular in individual work steps from the inside out built on the outside.

The method according to the invention for the manufacture of light furniture of all kinds, in particular seating furniture, made of foam contains a novel one and economical process, in which the structure is stitched from the outside to the inside The production of the upholstery from soft elastic in efficient foam injection molding processes Foam takes place and then in Inside the for stability the furniture's decisive hard foam as a supporting structure (molded part core) will.

The new method is therefore characterized in that the with Separating means provided, one-piece or multi-part hollow shape of the to be produced The furniture is sprayed with a reaction mixture which results in a soft foam is, then the remaining cavity of the foam mold, in which possibly non-foamable Reinforcements made of metal, wood or plastic are presented, with a hard one Foam resulting reaction mixture partially or completely sprayed out or is filled out in a shot process. The molded foam body produced in this way can be covered with textiles or completely with electrostatic flocking would be subjected.

According to the invention, there is also the possibility of the construction method nfrom the outside to the inside "to be completed in such a way that in the with release agents provided form first a prefabricated textile cover is inserted, then the Injection process for the production of a layer of flexible foam takes place and the remaining cavity in the injection or shot process with hard foam is filled out.

There is also a modification of the method according to the invention the possibility, in the form provided with release agents, first one with a insert a soft foam layer, laminated, prefabricated textile cover and then the remaining cavity in injection or Sohuss Verrahren with hard foam fill out. In any case, the furniture is not built in a modular manner prefabricated prefabricated parts, but by foaming in one form in the order from the outside to the inside.

The production z. B. an armchair is carried out according to the invention as follows: The injection mold made of wood, metal and / or hard foam is filled with a suitable, known release agents, e.g. D.

Silicone or wax. The shape is two or more if necessary designed in several parts for easy accessibility for the injection molding process To ensure that the article can be demolded. On the so prepared and if necessary dismantled into individual parts, a soft foam layer is sprayed on, which can be, for example, about 20 mm thick.

If necessary, the form joints are expediently after the complete Assembly of the molded parts already covered with soft foam in one last step Overmolded operation. The shape will with a hard foam The resulting mixture has a density of about 60 to 100 kg / m3 in the spray or shot process filled, which now the entire cavity of the mold is filled.

For a possibly desired introduction of force, z. B. of roller feet or for particularly highly stressed contour transitions, can be filled with hard Foam reinforcements of all kinds made of wood, plastic or metal laid in the mold and be lathered.

The demolded foam molding can for practical reasons in are usually provided with a textile cover. It can also be in itself known way an electrically conductive adhesive for the purpose of a subsequent electrostatic flocking can be applied.

Polyurethane foams are preferably used as foams, which are known to be applied as foamable, liquid reaction mixtures and Foam and liquefy in place. They generally exist from a mixture of already higher molecular weight polyhydroxyl compounds, in particular of polyesters or polyethers and polyisocyanates along with blowing agents, e.g. B. water, as well as activators, foam stabilizers and other auxiliaries. The application this mixture takes place in the known injection or shot process.

The figures explain the method according to the invention.

Figure 1 shows the contours of an armchair to be produced according to the invention (1). In Figure 2, the associated two-part injection mold is shown, which from the The lower part (2) and the upper part (3) consists. In the mold half covered with the release agent (Figures 3 a and 3 b) is first the reactive by means of a spray nozzle (4) Foam mixture injected for the soft foam layer (5). Figure 4 shows the ansohließende filling of the remaining cavity in the lower part of the mold with a one hard foam supplying mixture (6). After assembling the two molded parts (Figure 5) is also the cavity remaining in the upper mold part with a hard one Foam supplying mixture (7) filled.

The described procedure can be used for furniture parts of all kinds, especially used for chairs, stools, beds, vehicle seats and sofas.

Claims (5)

Claims 1) Method for producing furniture, in particular Seating furniture made of foam materials, characterized in that the one provided with separating means one-piece or multi-part hollow shape of the furniture to be produced with a one soft foam resulting reaction mixture is injected, then the remaining Cavity of the Schäusrorm, in which, if necessary, non-foamable reinforcements made of metal, Wood or plastic are presented, with a hard foam result Reaction mixture partially or completely sprayed out or in a shot process is filled out. 2) Verrahren according to claim 1), characterized in that per se known liquid reaction mixtures for the production of soft and hard polyurethane foams be used. 3) Method according to claim 1) and 2), characterized in that the moldings obtained are coated as a whole with textiles or an electrostatic one To be subjected to flocking. 4 The method according to claim 1) and 2), characterized in that in the mold provided with release agents is first inserted into a prefabricated textile cover then the spray process for the creation of a layer soft elastic foam is made and the remaining cavity in the injection or Shot method is filled with hard foam. 5) modification of the method according to claim 1) and 2), characterized in that that in the form provided with release agents first one with a soft foam layer laminated prefabricated textile cover is inserted and the remaining cavity the foam mold then with a reaction mixture that turns a hard foam sprayed out or filled in using the shot process. L e r s e i t e