Method and device for producing plastic molded skins having different subregions
The present invention relates to a method and a device for producing plastic molded skins having different subregions. For this purpose, before melting the first plastic material, a region of the molding tool surface ( 2 ) is covered with a separate energy self-sufficient mask ( 3 ). After the unmasked region of the molded tool surface ( 2 ) has been coated, the mask ( 3 ) is removed, and in a second manufacturing step the exposed subregions of the molding tool surface ( 2 ) is coated with a different plastic material, the two subregions of the plastic skin bonding with each other.
1. A method for production of subregions having different properties in molded plastic skins comprising the following steps:
placing a mask on an area of a mold tool, said mask being configured as a separate energy self-sufficient mask; an interior space of the mask includes a support, pressure cylinders, a locking bolt having spring-loaded pressure balls disposed therein, and a centering bushing; wherein an edge of the mask is configured as a sealing edge provided with an inflatable seal, wherein part of the sealing edge is in a plane which is different from a plane of the centering bushing;
centrally locking the mask in place with the locking bolt and a locking bushing, centering the mask with a centering pin that engages the centering bushing, wherein the locking action is effected via the spring-loaded pressure balls;
sealing the masked area between the mask and the mold tool surface by inflating the seal with compressed air from one of the pressure cylinders,
in a first forming step, depositing a first plastic material at an exposed surface area of the mold tool thereby forming a first molded skin, subsequently interrupting the forming process, unlocking the mask by releasing the spring-loaded pressure balls via the other pressure cylinder, and removing the mask, at a second surface area of the mold tool, depositing a second plastic material which is different from the first plastic material thereby forming a second molded skin in a second forming step, wherein the first and second plastic molded skins are bonding to a single molded skin having subregions with different properties.
2. The method according to claim 1 , wherein the mold tool is a galvanically produced mold tool which includes a locking bushing made from steel.
3. The method according to claim 1 , wherein the sealing of the masked area is controlled via a pneumatic timer element disposed in the interior space of the mask and carried out prior to the start of the the first forming step.
4. The method according to claim 1 , wherein the steps of depositing the mask, removing the mask and cleaning of the mask are carried out with the aid of a fully automated robot.
5. The method according to claim 1 , wherein formation of the molded skins having different subregions is carried out by rotation sintering or spray sintering.
6. The method according to claim 1 , wherein molding the skins having different subregions is carried out via a rotation sintering process utilizing a plastic material on the basis of at least one of: PVC and TPU in the form of a powder and depositing the plastic material by means of sequential melting at the surface of the molding tool.