1. Technical Field
The present disclosure relates to a molded article and a method for making the molded article.
2. Description of Related Art
Molded articles fabricated by injection molding are often painted for aesthetic reasons. However, paint may easily chip, peel, or wear off the molded article.
Therefore, there is room for improvement within the art.
Many aspects of the present molded article and method for making the same can be better understood with reference to the following drawings. The components in the various drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present molded article and method for making the same. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the diagrams.
The disclosed molded article can be a housing of electronic device, such as a mobile phone or personal digital assistant.
The first layer 10 may be made of a soft material selected from a group including leather, textile, and film. The soft material should be wear-resistant yet soft. The second layer 20 is made of a plastic material selected from a group including polycarbonate, polymethyl methacrylate, polystyrene, or any desired combination thereof. The third layer 30 is made of a hard material selected from a group including metal, glass, and ceramic. The hard material for the third layer 30 adds mechanical strength. When the third layer 30 is made of metal, it may also function as an antenna.
The molded article 100 can be made by injection molding, that is, molding the first layer 10 and the third layer 30 to the two opposite sides of the second layer 20, respectively, and if needed, reinforcing the bond with adhesive (not shown) placed between the layers. The adhesive can be made of polyurethane, epoxy resin, or a combination of the two.
Referring to
The first layer 10 is secured onto the core 442 by a vacuum communicating with the second suction holes 444. The third layer 30 is secured into the cavity 422 by a vacuum communicating with the first suction holes 424. The third layer 30 does not cover the channel 426. The female mold 42 engages with the male mold 44, and the core 442 extends into the cavity 422 to form a chamber 4244. Plastic molding material is injected into the chamber 4244 through the channel 426 and forms the second layer 20. The second layer 12 integrally combines with the first layer 10 and the third layer 20 to form the molded article 100, which can then be removed.
Understandably, a through hole (not shown) can be defined in the third layer 30 for injection of molten plastic into the chamber 4244 when the third layer 30 is substantially attached on the entire bottom of the cavity 422 and covers the channel 426. To increase the combining strength, the first layer 10 and the third layer 30 can be printed with adhesive thereon before molding. The adhesive adheres to the second layer 20.
Referring to
In
It is to be understood that the first layer 10 and the third layer 30 both can be made soft material, or both can be made of made of hard material.
It is to be understood that even though numerous characteristics and advantages of the present embodiments have been set forth in the foregoing description, together with details of structures and functions of various embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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201010211021.X | Jun 2010 | CN | national |
This application is related to co-pending U.S. patent applications (Attorney Docket No. US34278 and US34279), both entitled “MOLDED ARTICLE AND METHOD FOR MAKING THE SAME”, by Kun-Tsan Wu. Such applications have the same assignee as the present application. The above-identified application is incorporated herein by reference.