Method and apparatus for making a composite, in particular comprising an injection-molded part with a polyurethane coating
View Patent ↗In a method for producing a composite, a carrier component is placed into an opened cavity of a mold. The mold is then closed to a predetermined position, thereby creating a cavity of a first expanded size. To improve venting, a vacuum is generated in the expanded cavity before filling the expanded cavity with a flooding material. A compression step is then executed either at the same time as flooding material is introduced or following the introduction of the flooding material.
1. A method of making a composite, comprising the steps in the order of:
producing a carrier component;
transferring the carrier component into an open cavity of a mold;
closing the mold to a predefined position in which the cavity has a first expanded size;
applying a predefined pressure below atmospheric in the cavity of first expanded size to produce a vacuum;
measuring the pressure in the cavity of first expanded size;
introducing flooding material into the cavity of first expanded size; and
executing a compression molding step by reducing the cavity to a second contracted size.
2. The method of claim 1 , wherein the compression-molding step is executed at a same time as flooding material is introduced into the cavity of first expanded size.
3. The method of claim 1 , wherein the compression-molding step is executed after the introducing step.
4. The method of claim 1 , wherein the carrier component is produced by an injection molding process or injection compression molding process.
5. The method of claim 1 , wherein the flooding material is a polyurethane material.
6. The method of claim 1 , wherein the applying step includes the step of generating the vacuum for a predefined time.
7. The method of claim 1 , wherein the compression molding step is executed while the flooding material is introduced and during a time period after the flooding material has been introduced.
8. The method of claim 1 , wherein the introducing step includes the step of injecting the flooding material at a time instance in dependence on a magnitude of the pressure below atmospheric.
9. The method of claim 1 , wherein the compression molding step is controlled in dependence on a time of introduction of the flooding material.
10. The method of claim 1 , further comprising the step of introducing a medium for activating a surface of the carrier component into the cavity of first expanded size before the applying step.
11. The method of claim 1 , further comprising the step of opening the mold in a predetermined manner before the compression molding step.
12. The method of claim 1 , wherein the introducing step includes the step of injecting the flooding material, wherein the compression molding step is executed in dependence on a pressure by which the flooding material is injected into the cavity of first expanded size.
13. The method of claim 1 , wherein the compression molding step is executed path-dependent and force-dependent.