US3981668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for longitudinal stretch for blow molding
Assignee: Farrell Patent Co
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Filing: 1975-01-31
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Granted: 1976-09-21
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Expires: 1995-01-31
Abstract
Abstract This injection blow molding machine has special provision for maintaining the plastic of a parison on a core rod at the orientation temperature of the plastic; and stretching the plastic of the parison lengthwise of the core rod for orientation in the direction of one axis without any substantial increase in the diameter of the parison. After this orientation in one axis, the temperature is controlled to maintain an orientation temperature, and the plastic of the parison is then blown to a larger diameter so as to obtain orientation in another axis for bi-axial orientation. The core rod is covered by an elastic balloon, and provision is made for obtaining flow of the plastic on the core rod lengthwise of the rod during the first orientation operation.
Inventors
- 👤 John J. Farrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:19
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/44; B29C43/00; B29C43/02; B29C43/10; B29C43/12; B29K; B29K2105/00; B29K2105/25; B29K2105/253; Y; Y10; Y10S; Y10S425/00; Y10S425/015; Y10S425/016
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
196 words
Blow molding apparatus including in combination a core rod, an elastic balloon attached to the core rod at the neck end thereof, the balloon hugging the core rod when the balloon is in a deflated condition preparatory to having a parison applied over the outside surface of the balloon, and an end portion of the core rod remote from the neck end of the rod and that moves axially to extend the length of the core rod so that the balloon and the parison thereon are stretched lengthwise, characterized by the core rod being carried by one face of an indexing head that has a plurality of other faces that carry similar core rods and that move each rod successively to an injection station, characterized by the apparatus including two conditioning stations, means at the first conditioning station for partially blowing the balloons and parisons of successive core rods to move each balloon out of contact with its core rod, and means at the second conditioning station for actuating the movable portion of the core rods, characterized by temperature control means at the conditioning stations for maintaining the temperature of the parison within the orientation range.
Claim 2
Dependent Claim
196 words
Blow molding apparatus including in combination a core rod, an elastic balloon attached to the core rod at the neck end thereof, the balloon hugging the core rod when the balloon is in a deflated condition preparatory to having a parison applied over the outside surface of the balloon, and an end portion of the core rod remote from the neck end of the rod and that moves axially to extend the length of the core rod so that the balloon and the parison thereon are stretched lengthwise, characterized by the core rod being carried by one face of an indexing head that has a plurality of other faces that carry similar core rods and that move each rod successively to an injection station, characterized by the apparatus including two conditioning stations, means at the first conditioning station for partially blowing the balloons and parisons of successive core rods to move each balloon out of contact with its core rod, and means at the second conditioning station for actuating the movable portion of the core rods, characterized by temperature control means at the conditioning stations for maintaining the temperature of the parison within the orientation range.
Claim 3
Dependent Claim
50 words
The blow molding apparatus described in claim 1 characterized by the means for controlling the temperature of the parison including a core rod construction that has inlet and outlet passages therein for circulating temperature control fluid between the core rod and the balloon on which the core rod is carried.
Claim 4
Dependent Claim
47 words
The blow molding apparatus of claim 1, further comprising a blow molding station spaced from said second conditioning station whereby the axially oriented parison from the second conditioning station is transferred to the blow molding station for blow molding to the final configuration, by said indexing head.
Claim 5
Dependent Claim
71 words
The blow molding apparatus of claim 1, further comprising a mold being formed with a cavity for receiving the core rod and parison from the first conditioning station at the second conditioning station, and wherein said mold cavity is formed so as to permit longitudinal expansion of the core rod, balloon and parison with limited radial expansion of the balloon and parison, while maintaining the parison within its orientation temperature range.
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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) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |