US 6,202,276 B1Granted

Process for manufacturing an electromagnetic interference shielding superplastic alloy foil cladded outer shell product

OwnerTung-Han Chuanginventor

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Abstract

The present invention provides a process for manufacturing an electromagnetic interference shielding metallic foil cladded plastic outer shell product. A first side of a superplastic alloy foil is coated with an adhesive and then the foil is placed foil in a first half mold to allow the foil to be initially superplastically formed. A second half mold attached to a nozzle of an injection machine is covered onto the first half mold, and the two half molds are closed to further deform superplastic alloy foil. Softened plastic is introduced from the injection machine to a mold cavity between the foil and the second half mold, such that the superplastic alloy foil covered on the first half mold is completely formed and the softened plastic adheres on the adhesive-coated side of the superplastic alloy foil to form an electromagnetic interference shielding metallic foil cladded plastic outer shell product. Two types of products can be obtained, that is, the superplastic alloy foil can be either the outer wall or inner wall. Moreover, the final metallic plastic product can not only have as intricate a shape as an ordinary plastic product, but also a shielding effectiveness as high as an ordinary metallic shield.

Claims16

Dependent claims

A process for manufacturing an electromagnetic interference shielding metallic foil cladded plastic outer shell product, comprising the following sequential steps of:

(a) coating a first side of a superplastic alloy foil with an adhesive;
(b) placing the adhesive-coated superplastic alloy foil in a first half mold with a second side of the foil contacting the first half mold, and heating and applying flow stress to the superplastic alloy foil to allow the foil to superplastically form into a predetermined shape and to allow the foil to cover on the first half mold, whereby the superplastic alloy is initially superplastically formed;
(c) covering a second half mold attached to a nozzle of an injection machine onto the first half mold covered with the foil, and closing the two half molds to further deform the superplastic alloy foil, a mold cavity being formed between the adhesive-coated side of the superplastic alloy foil and the second half mold;
(d) introducing softened plastic from the injection machine via the nozzle to the mold cavity, such that the superplastic alloy foil covered on the first half mold is completely formed and the softened plastic adheres on the adhesive-coated side of the superplastic alloy foil to form an electromagnetic interference shielding metallic foil cladded plastic outer shell product;
and
(e) removing the plastic outer shell product from the mold.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/304,027Filed 3 May 1999
Priority: TW 8712156823 Dec 1998
Granted: 20 Mar 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification24 codes

B32B 15/08
Comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B21D 26/055
Characterised by the material of the blanks: blanks having super-plastic properties
B29C 45/1418
Incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles: the inserts being deformed or preformed,…
B29C 45/14221
The inserts being deformed or preformed, e.g. by the injection pressure: by tools, e.g. cutting means