Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Reexamination Certificate
1999-03-08
2001-07-17
Thibodeau, Paul (Department: 1773)
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
C215S012100, C428S411100, C428S412000, C428S474400, C428S480000, C428S500000, C428S522000, C428S523000
Reexamination Certificate
active
06261656
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to a co-layer preform. More specifically, the invention is directed to the addition of an infrared energy absorbing material to the inner preform layer, to effect preferential heating of the inner layer when exposing the co-layer preform to infrared energy.
DESCRIPTION OF THE PRIOR ART
Co-layer preforms, i.e., preforms made by injecting an outer preform over a previously injection molded inner layer, suffer much the same heating restrictions and complications as do monolayer preforms.
In a monolayer preform, the innermost surface of the preform stretches much farther than the outermost surface. To properly effect this differential stretching it is beneficial if the inner layer is hotter.
In a co-layer preform, it would be desirable to heat the inner preform to a higher temperature than the outer preform. Thus, the inner preform could properly stretch at a rate consistent with that of the outer preform upon formation of the co-layer container.
SUMMARY OF THE INVENTION
Accordant with the present invention, there has surprisingly been discovered a co-layer stretch blow molding preform. The preform comprises:
an outer plastic preform; and
an inner plastic preform, said inner plastic preform including an infrared energy absorbing material which is absent from the outer plastic preform.
The co-layer stretch blow molding preform according to the present invention is particularly useful for manufacturing co-layered plastic containers.
REFERENCES:
patent: 5700560 (1997-12-01), Kotani et al.
patent: 5759653 (1998-06-01), Collette et al.
patent: 5769262 (1998-06-01), Yamada et al.
patent: 5804305 (1998-09-01), Slat et al.
Streitwieser et al., Introduction to Organic Chemistry, 4th Edition, Section 17.10, pp. 471-473, 1995.*
Encyclopedia of Polymer Science and Engineering, vol. 5, pp. 286-295, Jun. 1985.
Fraser Donald R.
Plastic Technologies, Inc.
Thibodeau Paul
Zacharia Ramsey
LandOfFree
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