Translation of "Hinterschäumen" in English

Deep drawing and subsequent back-foaming is not possible.

A plastics sheet is "back-foamed" during performance of the process according to the invention.

Deep drawing and subsequent back foaming of the invention specific bonding foil are likewise possible.

Subsequently, the cavity is filled by rear-foaming the decorative layer 5 with a polyurethane foam.

For back foaming one-piece carpets stationary plants have proved to be appropriate.

An electric mold carrier is particularly suited for back-foaming of instrument panels.

For back foaming carpets, normally the following process steps are necessary:

The electric mold carrier is particularly suited for back-foaming of instrument panels.

The support and the skin are pour-behind foamed by filling the polyurethane material into the open mold.

By this subsequent “foam backing,” an already quite rigid three-dimensionally shaped component is obtained.

Foam backing here represents only one possible way of forming a support structure for the plastic skin.

However, the problem results in this respect that the reinforcement elements can float up on the back foaming.

Thus, such a back-foaming process allows the entire molding operation to be carried out with a single mold opening and closing cycle.

Thus, the prolongations ensure a reliable fixation of the hollow body in a foaming mold during back foaming.

Polyurethane should be mentioned here as typical material for rear-foaming, for rear-spraying, polypropylene.

Films containing PVC can no longer fulfill the new requirements to be met by a crash pad film, namely long term temperature resistance of 130° C. and dimensional stability without back foaming and without a supporting structure.

In addition, when these catalysts are used to produce composites (e.g., by foam-backing of plastics films), there is a risk of the catalyst diffusing into the covering material and, under the possible influence of sunlight and heat, damaging the covering material.

The present invention also relates to the tertiary amines having carbonate and urethane groups and optionally hydroxyl groups which are obtained by this process and to the use of these tertiary amines as catalysts in the production of polyurethane plastics by the isocyanate polyaddition process (particularly, the production of composites by the foam-backing of plastics films with a reaction mixture that forms a polyurethane foam).

The separating means prevents a change which is detrimental to esthetics, haptics, shape and/or safety and arises in the flexible foam and/or the outer covering or the composite element due to the compressive stresses arising during the back-foaming with rigid foam and possibly becoming visible upon removal of the composite element from the mold.

The material categories that come under consideration for said purpose are, for example, acrylonitrile-butadiene-styrene-co-polymerizates (ABS), acrylonitrile-styrene-acrylic-ester-copolymerisates (ASA), polyvinylchloride (PVC)/ABS-blends, thermoplastic olefins which, perhaps, may permit high frequency fusibility of the foil, ABS/ASA-blends, polyesters, such as polyethylene-terephthalate for example with appropriate hardness at ambient temperature, thermoplastic polyurethanes, which demonstrate special benefits during subsequent back-foaming with polyurethane reactive foam, for example, as well as mixtures thereof

In order to increase the adhesion between layers i) and ii), layer i) may be pretreated before being foam backed. Pretreatment may be accomplished, for example, by application of a primer, by flame treatment or mechanical roughening or exposure to light (radiation with a wavelength less than 800 nm) or to particles (sandblasting).

The invention is based on the discovery that this can be achieved if the heavy layer, instead of being produced and manufactured separately, is produced in one operation in the course of the foam backing of the shaped carpet in the tool.