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(12) Patent: | (11) CA 1053872 |
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(21) Application Number: | 201463 |
(54) English Title: | METHOD AND DEVICE FOR THE PRODUCTION OF ARTICLES HAVING A NON-CELLULAR SMOOTH SKIN AND A CELLULAR CORE FROM POLYMER MATERIALS |
(54) French Title: | METHODE ET APPAREILLAGE POUR LA PRODUCTION A PARTIR DE COMPOSES POLYMERIQUES D'ARTICLES A CENTRE CELLULAIRE RECOUVERTS D'UNE MEMBRANE LISSE NON CELLULAIRE |
Status: | Expired |
(52) Canadian Patent Classification (CPC): |
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(51) International Patent Classification (IPC): |
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(72) Inventors : |
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(73) Owners : |
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(71) Applicants : | |
(74) Agent: | NA |
(74) Associate agent: | NA |
(45) Issued: | 1979-05-08 |
(22) Filed Date: | |
Availability of licence: | N/A |
(25) Language of filing: | English |
Patent Cooperation Treaty (PCT): | No |
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(30) Application Priority Data: | None |
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ABSTRACT OF THE DISCLOSURE:
A method for the production of articles having a non-
cellular smooth skin and a cellular core from polymer materials
which contain blowing agents, by injection molding. The method
of the invention comprises heating the polymer material to a
temperature lower than the decomposition temperature of the
blowing agent as the polymer material flows through an injection
nozzle and into a mold cavity to form a non-cellular skin,
abruptly increasing the temperature of the flowing polymer melt
to above the decomposition temperature of the blowing agent to
cause the polymer to foam and to form a cellular core and
thereafter reducing the temperature of the flowing polymer melt
to below the decomposition temperature of the blowing agent to
complete the non-cellular skin in the area of the injection nozzle.
Note: Claims are shown in the official language in which they were submitted.
Note: Descriptions are shown in the official language in which they were submitted.
Sorry, the representative drawing for patent document number 1053872 was not found.
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Title | Date |
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Forecasted Issue Date | 1979-05-08 |
(45) Issued | 1979-05-08 |
Expired | 1996-05-08 |
There is no abandonment history.
Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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INSTITUTE PO METALOZNANIE I TECHNOLOGIA NA METALITE |
Past Owners on Record |
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None |