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Slush molding process

阅读：595发布：2024-01-10

专利汇可以提供Slush molding process专利检索，专利查询，专利分析的服务。并且A process for slush molding hollow thin-walled flexible plastisol articles which begins with the application of an initial thin coating of liquid plastisol to the interior surface of a cooled open mold. This initial coating is then gelled by impinging pressurized hot gas directly onto the exterior surface of the mold, preferably while the mold is inverted and rocking about a horizontal axis. Thereafter, the thickness of this initially gelled coating is increased by applying additional liquid plastisol to the interior surface of the mold, which additional plastisol is then gelled by the latent heat stored in the mold wall during the previous heating step. The entire gelled plastisol coating is finally fused by a second impingement of pressurized hot gas directly onto both the exterior mold surface and the plastisol coating on the interior mold surface, while the mold is rotating about a horizontal axis.，下面是Slush molding process专利的具体信息内容。

权利要求

2. A process for slush molding hollow thin-walled articles comprising the steps of: a. applying a relatively thin liquid plastisol coating to the interior surfaces of an open mold, the application of said coating being accomplished by at least partially filling the mold with plastisol and thereafter inverting the mold to drain any excess liquid plastisol from the mold; b. imparting a rocking motion to the inverted mold about a given axis while the plastisol coating remains in a liquid state, the motion imparted to the mold about said axis being such as to promote continued dRainage of excess liquid plastisol from the mold while preventing the same from accumulating in mold undercuts and recesses; c. gelling said relatively thin plastisol coating by impinging hot gas directly onto the exterior mold surfaces while the mold remains inverted and in rocking motion about said axis; d. increasing the thickness of the previously gelled plastisol coating by refilling the mold with liquid plastisol, allowing the latent heat stored in the mold wall as a result of the previous heating step to gel additional plastisol, and thereafter emptying the mold of any remaining liquid plastisol; e. fusing the gelled plastisol coating by impinging hot gaseous products of combustion onto both the exterior mold surfaces and the gelled plastisol coating, while the mold is in rotating motion; and, f. thereafter removing the resulting hollow thin-walled molded article from said mold.

3. The process claimed in claim 2 wherein the application of said relatively thin coating of liquid plastisol is accomplished while the temperature of the interior mold surface remains within a range of between 100*-150*F.

4. The process as claimed in claim 2 wherein the thickness of said relatively thin coating is approximately 15 to 25 mils.

5. The process as claimed in claim 2 wherein the said hot gas constitutes the gaseous products of combustion, the temperature of the hot gaseous products of combustion impinging on the exterior surfaces of the mold being between 800*-900*F.

6. The process as claimed in claim 5 further characterized by initial gellation being accomplished within 15 to 40 seconds.

7. The process as claimed in claim 6 wherein the additional gellation occasioned by the latent heat in the mold wall continues for a dwell period of approximately 10 seconds.

8. The process as claimed in claim 5 further characterized by the fusion of said gelled plastisol coating being accomplished while the mold is rotating about said axis.

9. The process as claimed in claim 8 wherein the temperature of the gaseous products of combustion impinging on the exterior mold surfaces and the gelled plastisol coating is between 800*-900*F.

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