DE1479929C - Process for the production of locally thickened molded articles from plastic - Google Patents

Claims (1)

1 2 The invention relates to a method for producing the adjust for the production of moldings of locally thickened moldings in plastic, for example polystyrene, polymers by automatic filling with a granulate urethane, polyethylene, polypropylene or polyacrylic thermoplastic, foamable plastic in the acid ester becomes in the unfoamed state pre-expanded state and foaming to form 5 rigid or elastic foils processed, which include bodies. . for example under the action of pressure and heat In the production of locally thickened molding or using a suitable binding agent, bodies made of plastic granules in molds by This binder must have a softening point Automatic filling results in difficulties that are below the processing temperature of the Keiten that on the recesses in the molds, io plastic granulate is in which the propellant by which local thickenings or reinforcements is contained. This way slides can be in gean Edges or certain surface parts of the shape - desired production sizes, rigid and elastic, to be formed in the body, filling disorders due to the admixture of pigments colored or in the occur through which these recesses are not produced in the full natural color of the plastic. the to be filled in constantly. These difficulties 15 processing can be done on release films, from have led to the fact that either distance from which the foamable films are peeled off and removed locally thickened moldings were tailored according to the respective requirements automatic filling of the molds and placed in the mold, with the len, or entirely foamable film was peeled off the release film on local thickenings or partially omitted and the molded body with 20 or the separating film with inserted into the mold one cannot become necessary in terms of strength. These cuts can be made on the wall wall thickness formed, for which a high material surface of the form is glued or in some other way effort was accepted. Another way to be arranged in a fixed position. If after closing consisted in subsequently changing the shape of the pre-expanded plastic granulate in the bring to. - - 25 automatic filling process shot into the mold It is known that foamable thermoplastic will not interfere with the automatic filling Plastic granulate in the unfoamed state of the process. In this way, any local by means of two opposing conveyors borrowed reinforcements on lightweight foam bodies to bring tapes into the shape of plates, and surfaces are attached, that the granulate particles are superficially softened 30 in foils made of foamable polystyrene or dissolved and then under the action of pressure with, for example, an increase in volume up to are glued to each other. These panels consist of un- 40%. Tests have shown that foaming Foamed granulate can easily be combined with sheet-like in closed molds. shaped end products pre-foamed and ready-foamed. lumen increase up to 15%> reach. In order to In order to eliminate the difficulties set out above, such films can also be used at any time. However, this process does not produce walled surfaces and moldings. Lösurigsweg displayed. those that have, for example, a thin-walled The invention is based on the object of connecting an extension to a more strongly developed area of the drive for the production of locally thickened molded bodies. Without the use of a body in molds by automatically filling with 40 previously inserted into the mold sheet of unKunststoff-Granulate, with which the above foamed granulate would be overcome in these thin-walled difficulties and moldings with certain areas of the form also filling disturbances arbitrarily arranged and developed thickening. ·
genes and can be produced efficiently with a homogeneous structure. 45 "· ■ -. ', According to the invention, this object is thereby achieved.
solves that in the opened form in the the Verdik- Processes for producing locally cut cuts from foils known per se from foamed-thick molded bodies in forms by means of car-compatible, but unfoamed thermoplastic 50 matic filling with a granulate of thermoplastic granulate be arranged in a fixed position, plastic, foamable plastic in advance closed the mold and then in the foamed state and foaming known way with the pre-expanded plastic moldings, characterized in that Granulate is charged and the foaming takes place in the open form in the tracked. . '■■ ·'. 55 thickenings of the molding forming the It has been shown that the blanks from such savings blanks from known per se relatively thin films, although they consist of a non-foamable, but non-foaming foamed film Granules exist, the local molds thermoplastic plastic granules layer body thickenings fill in completely and also a fixed position, whereupon the form fixed Connection with the already pre-expanded 60 closed and then in a manner known per se Incoming granulate, which is set up by an automatic filling device with the pre-expanded plastic granulate is shot into the mold. is sent and the foaming takes place.