US4036927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of molecularly oriented containers using reheat process
Assignee: Hoover Universal Inc
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Filing: 1975-04-09
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Granted: 1977-07-19
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Expires: 1995-04-09
Abstract
Abstract Molecularly oriented containers are formed from molded preforms made of an amorphous thermoplastic resin and having a finished neck tubular portion and a body portion which method includes subjecting the preform body to a thermoforming orienting step while at a temperature at which substantial molecular orientation occurs, said temperature being arrived at by first overheating the outside of said preform body using external heating means to an average outside temperature greater than the substantial molecular orientation temperature range thereby creating a temperature gradient across the thickness of said preform body and then cooling said headed preform body until the average outside temperature is within said,substantial molecular orientation temperature range and the entire preform body is at a temperature within said substantial molecular orientation temperature range and whereas said temperature gradient is significantly reduced.
Inventors
- 👤 Thomas J. Stolki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:13
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/64; B29C49/6409; B29C49/68; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0822; B29C2949/00; B29C2949/07; B29C2949/0715; B29C49/02; B29C49/06; B29C49/6436; B29C49/6462
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
164 words
In the method of forming a molecularly oriented container from a molded preform made of an amorphous thermoplastic resin and having an open end finished neck tubular portion and a closed end body portion which method includes subjecting the preform body to a thermoforming orienting step while in a temperature range at which substantial molecular orientation occurs, the improvement which comprises heating said preform body to said substantial molecular orientation temperature range by first overheating the outside surface of said preform body, by exposing only said outside surface to external heating means, to an average outside surface temperature greater than said substantial molecular orientation temperature range thereby creating a temperature gradient across the wall thickness of said preform body and then cooling said heated preform body until the average outside surface temperature is within said substantial molecular orientation temperature range and the entire preform body is at a temperature within said substantial molecular orientation temperature range and wherein said temperature gradient is significantly reduced.
Claim 2
Dependent Claim
164 words
In the method of forming a molecularly oriented container from a molded preform made of an amorphous thermoplastic resin and having an open end finished neck tubular portion and a closed end body portion which method includes subjecting the preform body to a thermoforming orienting step while in a temperature range at which substantial molecular orientation occurs, the improvement which comprises heating said preform body to said substantial molecular orientation temperature range by first overheating the outside surface of said preform body, by exposing only said outside surface to external heating means, to an average outside surface temperature greater than said substantial molecular orientation temperature range thereby creating a temperature gradient across the wall thickness of said preform body and then cooling said heated preform body until the average outside surface temperature is within said substantial molecular orientation temperature range and the entire preform body is at a temperature within said substantial molecular orientation temperature range and wherein said temperature gradient is significantly reduced.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein said thermoplastic resin is a nitrile polymer containing 55 to 85% by weight of nitrile monomer units based on the total polymer weight.
Claim 4
Dependent Claim
11 words
The method of claim 2 wherein the nitrile polymer is acrylonitrile.
Claim 5
Dependent Claim
13 words
The method of claim 3 wherein said acrylonitrile polymer contains a styrene comonomer.
Claim 6
Dependent Claim
13 words
The method of claim 4 wherein said preform is formed by blow molding.
Claim 7
Dependent Claim
13 words
The method of claim 4 wherein said preform is formed by injection molding.
Claim 8
Dependent Claim
29 words
The method of claim 1 wherein said preform is an amorphous thermoplastic preform and said heating and cooling is applied externally to the outside surface of said preform body.
Claim 9
Dependent Claim
28 words
The method of claim 7 wherein said preform is made of an acrylonitrile polymer containing 55 to 85% by weight of nitrile monomer units and a styrene comonomer.
Claim 10
Dependent Claim
173 words
In the method of forming a molecularly oriented container from a molded preform having an open end finished neck tubular portion and a closed end body portion and is made of an amorphous thermoplastic resin which has a glass transition temperature Tg, said method including axially stretching and radially expanding said preform body while in a temperature range at which substantial molecular orientation occurs, the improvement which comprises heating said molded preform body to said substantial molecular orientation temperature range by first overheating said preform body, by exposing only the outside surface thereof to external heating means, to an average outside surface temperature of from about 65° to about 100° F. greater than Tg thereby creating a temperature gradient across the thickness of said preform and then cooling said heated preform body until the average outside surface temperature is from about 20° to about 60° F. greater than Tg and the entire preform body is at a temperature within said substantial molecular orientation temperature range and wherein said temperature gradient is significantly reduced.
Claim 11
Dependent Claim
173 words
In the method of forming a molecularly oriented container from a molded preform having an open end finished neck tubular portion and a closed end body portion and is made of an amorphous thermoplastic resin which has a glass transition temperature Tg, said method including axially stretching and radially expanding said preform body while in a temperature range at which substantial molecular orientation occurs, the improvement which comprises heating said molded preform body to said substantial molecular orientation temperature range by first overheating said preform body, by exposing only the outside surface thereof to external heating means, to an average outside surface temperature of from about 65° to about 100° F. greater than Tg thereby creating a temperature gradient across the thickness of said preform and then cooling said heated preform body until the average outside surface temperature is from about 20° to about 60° F. greater than Tg and the entire preform body is at a temperature within said substantial molecular orientation temperature range and wherein said temperature gradient is significantly reduced.
Claim 12
Dependent Claim
29 words
The method of claim 9 wherein said thermoplastic resin is a nitrile polymer containing 55 to 85% by weight of nitrile polymer units based on the total polymer weight.
Claim 13
Dependent Claim
11 words
The method of claim 10 wherein the nitrile polymer is acrylonitrile.
Claim 14
Dependent Claim
13 words
The method of claim 11 wherein said acrylonitrile polymer contains a styrene comonomer.
Claim 15
Dependent Claim
13 words
The method of claim 12 wherein said preform is formed by blow molding.
Claim 16
Dependent Claim
59 words
The method of claim 12 wherein said container is a bottle and wherein said preform body is overheated to an average outside surface temperature of from about 70° to about 90° F. greater than Tg and said heated preform body is cooled to an average outside surface temperature of from about 30° to about 55° F. greater than Tg.
Claim 17
Dependent Claim
13 words
The method of claim 12 wherein said preform is formed by injection molding.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |