Anti-Delamination Feature For Double Injection Mold Parts
AssigneeMotorola, Inc.
InventorsBk SOHN, Kt LIM
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Abstract
An effective economical anti-delamination feature 100 and process 102 for double injected molding is provided to mold attractive high quality products 104, such as, but not limited to, grommets 106 for use in electronic communications devices 108. In the process, after a first shot 114 is injected into a double injection mold 110, an undercut 116 comprising a delamination feature is formed in the double injection mold by tool compression or partial heating, before injecting a second shot 128 into the double injection mold.
Claims20
An anti-delamination process for double injected molding, comprising the steps of:
- providing a double injection mold;
- injecting a first shot into the double injection mold;
- forming an undercut comprising a delamination feature in the double injection mold by tool compression or partial heating;
- injecting a second shot into the double injection mold;
- allowing the shots to solidify;
- forming a double injected molded part;
- and
- substantially preventing delamination of the molded part.
An anti-delamination feature for double injected molded parts, comprising:
- a double injection mold with a cavity;
- a mold core comprising a tool with an elongated body and a head providing a tip, said head having a transverse span substantially greater than a maximum transverse distance across said elongated body of said tool;
- a first shot comprising a first material for injection into said cavity;
- an anti-delamination undercut formed by compression of said tool after said first shot has been injected into said cavity;
- a second shot comprising a second material for injection into said cavity after said antidelamination undercut is formed, said second material being different than said first material;
- and
- a double injected laminated molded part comprising said first and second materials substantially contacting each other and being substantially prevented from separating and delaminating.
An anti-delamination process for double injected molding, comprising the steps of:
- providing a double injection mold with a grommet-shaped cavity;
- injecting a first shot comprising a first material into the grommet-shaped cavity of the double injection mold;
- forming a nail-shaped undercut comprising a delamination undercut feature in the double injected mold by tool compression of a nail-shaped tool of a mold core after the first shot, the nail-shaped tool having an elongated body and a head, the head having a transverse span substantially greater than a maximum transverse distance across the elongated body of the nail-shaped tool;
- injecting a second shot comprising a second material into the grommet-shaped cavity of the double injected mold after the nail-shaped undercut feature has been formed, the second material being different than the first material;
- allowing the shots to solidify;
- forming a double injected molded laminated grommet;
- and
- substantially minimizing separation of the first and second materials in the double injected molded grommet to substantially prevent delamination of the grommet.
Dependencies are inferred from the claim text.