Patent US3554506A successfully refreshed from Google Patents.
US3554506A
Expired / Lapsed
US
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Rapid heating of thick wall parison preforms
Assignee: Phillips Petroleum Co
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Filing: 1968-12-13
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Granted: 1971-01-12
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Expires: 1988-12-13
Abstract
Abstract A parison preform is placed in a heating block so as to heat the parison from the outside by means of conductive heat, during which time a fluid such as air is circulated through the parison to impart heat from the inside.
Inventors
- 👤 Charles L Seefluth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:51
CPC Classifications
B; B29; B29B; B29B13/00; B29B13/02; B29B13/023; B29B13/024; B29C; B29C35/00; B29C35/02; B29C35/04; B29C49/00; B29C49/42; B29C49/64; B29C49/68; B29C49/685; B29C35/045
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
45 words
A method of heating a tubular thermoplastic parison comprising: introducing said parison into a heating block; imparting heat to the outside of said parison by conduction through direct contact with said heating block; and passing heated gaseous fluid through the interior of said tubular parison.
Claim 2
Independent Claim
45 words
A method of heating a tubular thermoplastic parison comprising: introducing said parison into a heating block; imparting heat to the outside of said parison by conduction through direct contact with said heating block; and passing heated gaseous fluid through the interior of said tubular parison.
Claim 3
Dependent Claim
56 words
A method according to claim 1 wherein said heating block is a metallic wheel rotating about an axis with at least one row of holes around the periphery of said wheel concentric with said axis, said wheel being rotated so as to pass parisons after introduction into said wheel through at least one circulating air oven.
Claim 4
Dependent Claim
42 words
A method according to claim 2 wherein there are two circulating air ovens and heated air is passed through the interior of said parisons in a first direction in one oven and is passed in the reverse direction in the other oven.
Claim 5
Dependent Claim
57 words
A method according to claim 2 wherein said thermoplastic material is a polymer of a 1-olefin selected from the group consisting of ethylene, propylene, butene, and mixtures thereof, said heating being controlled so as to heat the bulk of said thermoplastic material to within 1* to 50* F. of the crystalline melting point of said thermoplastic material.
Claim 6
Dependent Claim
12 words
A method according to claim 4 wherein said thermoplastic material is polypropylene.
Claim 7
Dependent Claim
18 words
A method according to claim 4 wherein said parison has a wall thickness of greater than 100 mils.
Claim 8
Dependent Claim
18 words
A method according to claim 4 wherein said parison has a wall thickness of 120 to 175 mils.
Claim 9
Dependent Claim
135 words
Apparatus for heating a length of tubular material comprising in combination: a frame; a rotating wheel having an axis carried by said frame, said wheel having at least one row of holes around the periphery thereof, said holes being arranged in a pattern concentric with said axis and adapted to receive said tubular material; means to heat said wheel; at least one oven disposed such that the periphery of said wheel containing said holes rotates through said oven throughout a portion of its circumference; means to insert said lengths of tubular material into said holes; means to circulate heated air through the interior of said lengths of material; and means to remove said lengths of tubular material after a portion of said wheel containing said lengths has been rotated through said at least one oven.
Claim 10
Dependent Claim
135 words
Apparatus for heating a length of tubular material comprising in combination: a frame; a rotating wheel having an axis carried by said frame, said wheel having at least one row of holes around the periphery thereof, said holes being arranged in a pattern concentric with said axis and adapted to receive said tubular material; means to heat said wheel; at least one oven disposed such that the periphery of said wheel containing said holes rotates through said oven throughout a portion of its circumference; means to insert said lengths of tubular material into said holes; means to circulate heated air through the interior of said lengths of material; and means to remove said lengths of tubular material after a portion of said wheel containing said lengths has been rotated through said at least one oven.
Claim 11
Dependent Claim
49 words
Apparatus according to claim 8 wherein there are two ovens, said means to circulate said heated air comprising a means to circulate said air in a first direction through said lengths of material in one oven and to circulate said air in the opposite direction in said second oven.
Claim 12
Dependent Claim
19 words
Apparatus according to claim 9 wherein the portion of said wheel adapted to receive said tubular material comprises aluminum.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |