High volume production of low permeation plastic fuel tanks using parallel offset twinsheet pressure forming
First Claim
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1. A method of high volume production of a low permeation plastic container, the method comprising:
- a) progressively heating by multi-stage convection a plurality of thermoplastic sheets to a first temperature;
b) removing a group of thermoplastic sheets from the plurality of thermoplastic sheets;
c) heating the group of thermoplastic sheets to a second temperature; and
d) forming the group of thermoplastic sheets into a container after heating the group of thermoplastic sheets to the second temperature.
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Abstract
Processes are disclosed for producing plastic containers from thermoplastic sheets where the thermoplastic sheets are processed in parallel to form a low permeation plastic container. A plurality of thermoplastic sheets are progressively heated to a first temperature in a pre-conditioning stage. A group of the thermoplastic sheets are selected from the plurality of thermoplastic sheets and rapidly heated to a second temperature in a final heat stage. The group of thermoplastic sheets are then processed in a forming stage to form the low permeation plastic container.
25 Citations
20 Claims
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1. A method of high volume production of a low permeation plastic container, the method comprising:
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a) progressively heating by multi-stage convection a plurality of thermoplastic sheets to a first temperature; b) removing a group of thermoplastic sheets from the plurality of thermoplastic sheets; c) heating the group of thermoplastic sheets to a second temperature; and d) forming the group of thermoplastic sheets into a container after heating the group of thermoplastic sheets to the second temperature. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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2. A method of high volume production of a low permeation plastic container, the method comprising:
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a) progressively heating a plurality of thermoplastic sheets in a multi-stage convection oven to a first temperature; b) removing a group of thermoplastic sheets from the plurality of thermoplastic sheets; c) heating the group of thermoplastic sheets to a second temperature; and d) forming the group of thermoplastic sheets into a container after heating the group of thermoplastic sheets to the second temperature.
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11. A method for high volume production of a low permeation plastic fuel tank, the method comprising:
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a) progressively raising the temperature of a plurality of thermoplastic sheets to a pre-processing temperature in a multi-stage convection oven within a pre-conditioning stage; b) indexing at least two, but less than all, of the thermoplastic sheets to a final heat stage; c) further increasing the temperature of the at least two thermoplastic sheets to a processing temperature; d) indexing the at least two thermoplastic sheets to a forming stage; e) urging each of the at least two thermoplastic sheets into contact with a mold; and f) fusing the at least two thermoplastic sheets to form a plastic fue tank. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification