Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Reexamination Certificate
1996-08-26
2001-11-20
Silbaugh, Jan H. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
C264S541000, C264S171270, C264S209100
Reexamination Certificate
active
06319454
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to manufacturing of a hollow plastic product and in particular to a method and apparatus for manufacturing a hollow plastic product having an irregular structure, such as a projection which projects outwardly from the outer surface of the product, or to a method of manufacturing a hollow plastic product having a change in composition. More specifically, the present invention relates to a blow molding technique for fabricating a hollow plastic product having a desired shape which cannot be manufactured by the conventional blow molding technology.
2. Description of the Prior Art
If it is desired to manufacture a hollow plastic product
2
having a projection
1
which projects outwardly from the outer surface of a main body
2
′ in accordance with the typical prior art technique, the main body
2
′ is first fabricated by blow molding and then the projection, which has been previously fabricated by any appropriate method, such as injection molding, is fixedly attached to the main body
2
′. Such an approach is not advantageous because it requires a plurability of separate steps to carry out in manufacture and the connection between the main body
2
′ and the later-attached projection
1
is not reliable and low in strength. On the other hand, it is true that the projection
1
may be manufactured together with the main body
2
′ at the same time by blow molding; in this case, however, a significantly large flash is necessarily formed, and, thus it is expensive and time consuming to remove such a large flash, not to mention the production of significant waste of material.
Furthermore, it is sometimes desired that a hollow plastic product differs in composition depending on the location thereby providing different properties. For example, a hollow plastic tube is often desired to have a relatively hard section to be fixedly attached to a metal fitting or the like and another section which is relatively soft for providing an easy bending characteristic. In such a case, a typical prior art approach would be to first form different sections separately and then put them together to form a final product and such an approach is disadvantageous because such a multistep process would be time consuming and expensive and the integrity of the final product is relatively poor.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to obviate the disdavantages of the prior art as described above and to provide an improved method and apparatus for manufacturing a hollow plastic product.
Another object of the present invention is to provide an improved method and apparatus for manufacturing a hollow plastic product having a projection which projects outwardly from the outer surface of the product.
A further object of the present invention is to provide an improved blow molding method and apparatus for manufacturing a hollow plastic product having any desired shape and structure.
A still further object of the present invention is to provide an improved blow molding method and apparatus capable of manufacturing a hollow plastic product having locally different compositions and properties.
A still further object of the present invention is to provide an improved blow molding method and apparatus capable of manufacturing a hollow plastic product having a complicated structure in a reduced number of steps.
Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings.
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Ezaki Yasuo
Nakagawa Tatsuya
Excell Corporation
McDowell Suzanne E.
Silbaugh Jan H.
Skjerven Morrill & MacPherson LLP
Steuber David E.
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