Mold and method for manufacturing two-layered preforms by injection overmolding, and two-layered preform

a two-layer preform and injection molding technology, which is applied in the direction of turning machine accessories, drawing profiling tools, pipes, etc., can solve the problems of affecting the quality of the preform, so as to reduce the capacity of the inner layer and achieve the effect of efficient barrier against ligh
US20100092711A1Inactive Publication Date: 2010-04-15MOLMASA APLICACIONES TECNICAS
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
MOLMASA APLICACIONES TECNICAS
Publication Date
2010-04-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The mold includes a first molding cavity connected to a first hot channel for supplying a primary molding material, a second overmolding cavity connected to a second hot channel for supplying an overmolding material; and a core configured to be first introduced in the first cavity for a molding operation of a first layer, and to then be introduced, with the first layer thereon, in the second cavity for an overmolding operation of a second layer. At least one supporting member is arranged to support the core with respect to the first cavity during the entire molding operation of the first layer. An opening left in the first layer by the supporting member is filled and / or covered by the second layer.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is a Continuation-in-Part (CIP) Application of PCT International Application No. PCT / ES2008 / 000226, filed Apr. 11, 2008, which claims benefit of priority from PCT International Application No. PCT / ES2007 / 000202, filed Apr. 11, 2007. The contents of these applications are incorporated herein by reference.TECHNICAL FIELD

[0002] The present invention relates to a mold and a method for manufacturing two-layered preforms by plastic injection overmolding, including means for stably supporting a mold core inside a corresponding mold cavity while an injection step for injecting a plastic material into said cavity is performed. The present invention also relates to a two-layered preform provided with an inner layer of a material capable of providing a barrier effect against light by absorption and an outer layer of a material capable of providing a barrier effect against light by reflection, such two-layered preform being applicable...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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