Insert molding method
A method of insert molding a preformed item into a molded product, the molded product being formed by injecting a moldable material into a mold, is disclosed. The method includes adhering the preformed item to a surface of the mold with an adhesive, wherein the surface to which the preformed item is adhered is free of any features provided for holding the preformed item in place on the mold surface. The method next includes injecting the moldable material into the mold such that the moldable material at least partially surrounds the preformed item, and curing the moldable material. Articles molded via the disclosed method are also described.
1. A method of insert molding an electronic element into a molded product, the molded product being formed by injecting a moldable material into a mold, the method comprising:
adhering the electronic element to a surface of the mold with an adhesive configured to decompose with heat and/or pressure in the molding process, wherein the surface to which the electronic element is adhered is free of any features provided for holding the electronic element in place on the mold surface;
injecting the moldable material into the mold such that the moldable material at least partially surrounds the electronic element; and
curing the moldable material, decomposing the adhesive with heat and/or pressure to reduce the amount of any residue
wherein the molded product is a doll, and wherein the electronic element includes a controller configured to control an interactive feature incorporated into the doll.
2. The method of claim 1 , wherein the electronic element is a printed circuit board.
3. The method of claim 2 , wherein the printed circuit board includes circuits formed with surface mount components.
4. The method of claim 1 , wherein the adhesive is applied to the electronic element via a release sheet.
5. The method of claim 1 , wherein the adhesive is a block copolymer adhesive.
6. The method of claim 1 , wherein the adhesive is a pressure-sensitive adhesive.
7. The method of claim 1 , wherein the adhesive is applied to the electronic element in a layer having a thickness of 0.002–0.005 inches before the electronic element is adhered to the mold.
8. The method of claim 1 , wherein injecting the moldable material into the mold includes reaction injection molding with at least two reactive components into the mold.
9. The method of claim 1 , wherein the moldable material is selected from the group consisting of ABS plastic and elastomers.
10. The method of claim 1 , further comprising removing the molded product from the mold after curing the moldable material, and then coating any remaining adhesive with an inert substance.
11. The method of claim 10 , wherein the inert substance is talcum powder.
12. The method of claim 1 , wherein the doll is molded via a roto-casting molding process.
13. The method of claim 1 , wherein the doll is molded via a slush molding process.
14. The method of claim 1 , further comprising adhering a piece of fabric to a surface of the mold before injecting the moldable material into the mold.
15. The method of claim 14 , wherein the doll includes a head having an eye, and wherein the piece of fabric is adhered to the mold in a location such that the piece of fabric is insert molded into the head adjacent the eye of the doll's head.
16. The method of claim 1 , further comprising adhering a support piece configured to support a shape of a surface feature of a face of the doll to a surface of the mold before injecting the moldable material into the mold.