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 is covered with a separate energy-self-sufficient mask. After an unmasked region of the molding tool surface has been coated, the mask is removed, and in a second manufacturing step, the exposed subregion of the molding tool surface is coated with a different plastic material, the two subregions of the plastic skin bonding with each other.
1. A system for producing subregions having different properties in molded plastic skins, comprising:
a heatable mold tool that forms plastic molded skins from deposited plastic material, at least one mask for selectively covering an area of the surface of the mold tool such that no plastic material is deposited onto the mold tool in the covered area,
said mask configured as an energy self-sufficient mask, wherein an interior space of the mask includes a support, pressure cylinders with which a locking and a sealing action of the mask is effected, a locking bolt including spring-loaded pressure balls and a centering bushing disposed therein;
an edge of the mask is configured as a sealing edge provided with an inflatable sealing element inflatable by one of the pressure cylinders and in an inflated state the sealing element is engaged with the sealing edge sealing the mask to the mold tool, wherein part of the sealing edge is in a plane which is different from a plane of the centering bushing, and wherein the surface of the mold tool includes a locking bushing and a centering pin for engagement with the corresponding locking bolt and the centering bushing in the mask respectively.
2. The system according to claim 1 , wherein the mold tool is a galvanically produced mold tool which includes the locking bushing made of steel.
3. The system according to claim 1 , wherein the mask further comprises:
a timer element.
4. The system according to claim 1 , wherein the inflatable seal is made of permanently elastic and temperature resistant material.
5. The system according to claim 4 , wherein the permanently elastic and temperature resistant material is polyurethane or silicon caoutchouc.
6. The system device according to claim 3 , wherein the sealing of the masked area is controlled by the timer element.
7. The system according to claim 6 , wherein the timer element is a pneumatic element.
8. The system according to claim 1 , wherein the system is adapted for spray sintering or rotation sintering the plastic molded skins.
9. The system according to claim 1 , wherein the system is adapted for rotation sintering of plastic molded skins with plastic powders on the basis of PVC or TPU.