US4065535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thread forming and neck finishing process
Assignee: Metal Box Enterprises Inc
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Filing: 1976-12-27
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Granted: 1977-12-27
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Expires: 1996-12-27
Abstract
Abstract The invention is a process for biaxially blow molding hollow plastic articles to provide a finished neck of axially oriented material in the molding step. One end of a plastic parison is placed over a blow pin positioned between separable mold halves. The parison is then axially oriented and necked down over said blow pin. A crammer sleeve is positioned over the blow pin to cram axially oriented material into the neck finishing cavities when the molds are closed over said blow pin and parison.
Inventors
- 👤 Richard Webster Legrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:29
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/76; B29C49/761; B29C49/08; B29C49/10; B29K; B29K2995/00; B29K2995/0037; B29K2995/004
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
216 words
A process for biaxially blow molding hollow plastic articles to provide a finished neck of axially oriented material comprising: a. heating a parison of partially crystalline orientable material to just below the material's crystalline melting point; b. placing one end of said parison over a blow pin; c. clamping said one end of said parison over and radially spaced from said blow pin; d. axially stretching and orienting said parison, thereby drawing said one end of said parison down against said blow pin and reducing the thickness of said parison to a first wall thickness over said blow pin; e. further stretching the free portion of said parison to a second wall thickness, said second wall thickness being thinner than said first wall thickness; f. clamping mold means around said parison, said mold means having neck finishing cavities contained therein in the portion of said mold means surrounding said blow pin; g. axially moving an inner portion of the parison in the clamped end of said parison toward said mold means, thereby forcing a portion of said oriented parison into the neck finishing cavities forming a finished neck; and h. introducing blow air via the blow pin to radially expand the portion of said parison having said second wall thickness producing a biaxially oriented container body.
Claim 2
Dependent Claim
216 words
A process for biaxially blow molding hollow plastic articles to provide a finished neck of axially oriented material comprising: a. heating a parison of partially crystalline orientable material to just below the material's crystalline melting point; b. placing one end of said parison over a blow pin; c. clamping said one end of said parison over and radially spaced from said blow pin; d. axially stretching and orienting said parison, thereby drawing said one end of said parison down against said blow pin and reducing the thickness of said parison to a first wall thickness over said blow pin; e. further stretching the free portion of said parison to a second wall thickness, said second wall thickness being thinner than said first wall thickness; f. clamping mold means around said parison, said mold means having neck finishing cavities contained therein in the portion of said mold means surrounding said blow pin; g. axially moving an inner portion of the parison in the clamped end of said parison toward said mold means, thereby forcing a portion of said oriented parison into the neck finishing cavities forming a finished neck; and h. introducing blow air via the blow pin to radially expand the portion of said parison having said second wall thickness producing a biaxially oriented container body.
Claim 3
Dependent Claim
24 words
A process as in claim 1 wherein said axial moving of said heated parison and said introduction of said blow air is accomplished simultaneously.
Claim 4
Dependent Claim
217 words
A process for biaxially blow molding hollow plastic articles to provide a finished neck of axially oriented material comprising: a. heating a parison of partially crystalline orientable material to just below the material's crystalline melting point; b. placing one end of said parison over a blow pin; c. clamping said one end of said parison over and radially spaced from said blow pin; d. axially stretching and orienting said parison, thereby drawing said one end of said parison down against said blow pin and reducing the thickness of said parison to a first wall thickness over said blow pin; e. further stretching the free portion of said parison to a second wall thickness, said second wall thickness being thinner than said first wall thickness; f. clamping mold means around said parison, said mold means having neck finishing cavities contained therein in the portion of said mold means surrounding said blow pin; g. introducing blow air via the blow pin to radially expand the portion of said parison having said second wall thickness producing a biaxially oriented container body; and then h. axially moving an inner portion of the parison in the clamped end of said parison toward said mold means thereby forcing a portion of said oriented parison into the neck finishing cavities forming a finished neck.
Claim 5
Dependent Claim
217 words
A process for biaxially blow molding hollow plastic articles to provide a finished neck of axially oriented material comprising: a. heating a parison of partially crystalline orientable material to just below the material's crystalline melting point; b. placing one end of said parison over a blow pin; c. clamping said one end of said parison over and radially spaced from said blow pin; d. axially stretching and orienting said parison, thereby drawing said one end of said parison down against said blow pin and reducing the thickness of said parison to a first wall thickness over said blow pin; e. further stretching the free portion of said parison to a second wall thickness, said second wall thickness being thinner than said first wall thickness; f. clamping mold means around said parison, said mold means having neck finishing cavities contained therein in the portion of said mold means surrounding said blow pin; g. introducing blow air via the blow pin to radially expand the portion of said parison having said second wall thickness producing a biaxially oriented container body; and then h. axially moving an inner portion of the parison in the clamped end of said parison toward said mold means thereby forcing a portion of said oriented parison into the neck finishing cavities forming a finished neck.
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) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |