US4306924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for producing a plastic container having a reclosable fastener
Assignee: Glad Products Co
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Filing: 1980-03-28
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Granted: 1981-12-22
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Expires: 2000-03-28
Abstract
Abstract An apparatus for producing a plastic container having occludable closure strips comprises a source for the closure strips, a rotatable casting cylinder having a pair of spaced apart circumferential grooves defined therein, a mechanism for advancing the closure strips to the casting cylinder, an extruder for casting a plastic film onto the casting cylinder so that it becomes connected to base portions of the closure strips, and a chill roll for receiving the combination of plastic film and closure strips to provide cooling.
Inventors
- 👤 Ewald A. Kamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:07
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/002; B29C37/00; B29C37/0078; B29C37/0082; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/342; B29C66/40; B29C66/47; B29C66/472; B29C66/4722; B29C65/00; B29C65/02; B29C65/022; B29C65/028; B29C65/10; B29C65/18; B29C66/03; B29C66/034; B29C66/0342; B29L; B29L2005/00; B31; B31B; B31B70/00; B31B70/74; B31B70/81; B31B70/813; B31B70/8131; B31B70/8132
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
133 words
An apparatus for producing a plastic film connected to a pair of occludable closure strips, each of said closure strips having profile and base portions; said apparatus comprising: feeding means for supplying said closure strips; a rotatable casting cylinder having a pair of spaced apart circumferential grooves defined therein; advancing means for advancing said closure strips to said casting cylinder so that respective unoccluded profile portions of said closure strips extend into the respective grooves of said casting cylinder; extruding means for casting a plastic film onto said casting cylinder so that said plastic film becomes connected to said base portions of said closure strips; urging means for pressing said plastic film against said base portions; and cooling means for receiving the combination of said plastic film and closure strips to provide cooling.
Claim 2
Independent Claim
133 words
An apparatus for producing a plastic film connected to a pair of occludable closure strips, each of said closure strips having profile and base portions; said apparatus comprising: feeding means for supplying said closure strips; a rotatable casting cylinder having a pair of spaced apart circumferential grooves defined therein; advancing means for advancing said closure strips to said casting cylinder so that respective unoccluded profile portions of said closure strips extend into the respective grooves of said casting cylinder; extruding means for casting a plastic film onto said casting cylinder so that said plastic film becomes connected to said base portions of said closure strips; urging means for pressing said plastic film against said base portions; and cooling means for receiving the combination of said plastic film and closure strips to provide cooling.
Claim 3
Dependent Claim
26 words
The apparatus as claimed in claim 1, further comprising heating means for heating said closure strips before said closure strips are positioned onto said casting cylinder.
Claim 4
Dependent Claim
15 words
The apparatus as claimed in claim 1, wherein said cooling means comprises a chill roll.
Claim 5
Dependent Claim
15 words
The apparatus as claimed in claim 1, wherein said urging means comprises a chill roll.
Claim 6
Dependent Claim
15 words
The apparatus as claimed in claim 1, wherein said urging means comprises an air knife.
Claim 7
Dependent Claim
14 words
The apparatus as claimed in claim 1, wherein said closure strips are u-shaped channels.
Claim 8
Dependent Claim
48 words
The apparatus of claim 1, further comprising a suction device wholly separate and distinct from and external to said casting cylinder, urging means and cooling means and positioned to minimize air entrapment between said plastic film and said closure strips when they are being connected to each other.
Claim 9
Independent Claim
106 words
A method for producing a plastic film connected to a pair of occludable closure strips, each of said closure strips having profile and base portions; said method comprising the steps of supplying said closure strips; advancing said closure strips to a rotatable casting cylinder having a pair of spaced apart circumferential grooves so that respective unoccluded profile portions of said closure strips extend into the respective grooves of said casting cylinder; extruding a plastic film onto said casting cylinder so that said plastic film becomes connected to said base portions of said closure strips; and thereafter, cooling the combination of said plastic film and closure strips.
Claim 10
Independent Claim
106 words
A method for producing a plastic film connected to a pair of occludable closure strips, each of said closure strips having profile and base portions; said method comprising the steps of supplying said closure strips; advancing said closure strips to a rotatable casting cylinder having a pair of spaced apart circumferential grooves so that respective unoccluded profile portions of said closure strips extend into the respective grooves of said casting cylinder; extruding a plastic film onto said casting cylinder so that said plastic film becomes connected to said base portions of said closure strips; and thereafter, cooling the combination of said plastic film and closure strips.
Claim 11
Dependent Claim
21 words
The method of claim 8, further comprising heating said closure strips before said closure strips are positioned onto said casting cylinder.
Claim 12
Dependent Claim
41 words
The method of claim 8, further comprising positioning suctioning means wholly separate and distinct from and external to said casting cylinder to minimize air entrapment between said plastic film and said closure strips when they are being connected to each other.
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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) | 1984-12-21 | 1985-06-22 | 1985-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-21 | 1989-06-22 | 1989-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-21 | 1993-06-22 | 1993-12-22 | $7700.00 | Window Closed / Lapsed |