US4755248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slot-cast intergrated interlocking film closure structure
Assignee: SC Johnson Home Storage Inc
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Filing: 1986-12-30
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Granted: 1988-07-05
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Expires: 2006-12-30
Abstract
Abstract A method and apparatus is disclosed for producing a reclosable bag film. The bag film is produced by extruding a bag film web having a relatively thinner first portion and relatively thicker second portions which are formed unitarily with the first portion. Closure members preferably in the form of male and female fastener profiles, are formed separately from the web portion and joined to the thicker second portions before the thicker second portions have become cooled to an ambient temperature.
Inventors
- 👤 Herbert B. Geiger
- 👤 Donald L. Kain, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:48
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/305; B29C48/025; B29C48/0255; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29C48/12; B29C48/001; B29C48/15; B29C48/154; B29C48/155; B29C48/16; B29C48/18; B29C48/22; B29L; B29L2007/00; B29L2007/001; B29L2031/00; B29L2031/712; B29L2031/7128; B29L2031/727; B29L2031/7282; Y; Y10; Y10S; Y10S24/00; Y10S24/30; Y10S24/38; Y10S24/39; Y10S24/50; Y10T; Y10T24/00; Y10T24/45; Y10T24/45152; Y10T292/00; Y10T292/48
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
73 words
A method for forming plastic bag film for reclosable plastic bags comprising extruding a bag film web including a relatively thinner first portion having relatively lesser heat retention properties and a relatively thicker second portion having relatively greater heat retention properties, extruding a closure member, joining said closure member to said thicker second portion before said thicker second portion has cooled to an ambient temperature, and cooling said closure member and bag film.
Claim 2
Independent Claim
73 words
A method for forming plastic bag film for reclosable plastic bags comprising extruding a bag film web including a relatively thinner first portion having relatively lesser heat retention properties and a relatively thicker second portion having relatively greater heat retention properties, extruding a closure member, joining said closure member to said thicker second portion before said thicker second portion has cooled to an ambient temperature, and cooling said closure member and bag film.
Claim 3
Dependent Claim
62 words
The method of claim 1 wherein said step of extruding a bag film web comprises the step of extruding said bag film web with a slotted extrusion die having a relatively thinner first portion through which said first portion of said web is extruded and a relatively thicker second portion through which said second portion of said bag film web is extruded.
Claim 4
Dependent Claim
41 words
The method of claim 2 wherein said relatively thinner first portion of said extrusion die has a thickness of between about 0.020 and 0.040 inches and said relatively thicker second portion has a thickness of between about 0.030 and 0.080 inches.
Claim 5
Dependent Claim
47 words
The method of claim 1 wherein the step of extruding said bag film web comprises the step of extruding a bag film web having said first portion being between about 0.001 and 0.003 inches thick and said second portion being between about 0.003 and 0.008 inches thick.
Claim 6
Dependent Claim
32 words
The method of claim 1 wherein said step of cooling said closure member containing bag film comprises the step of passing said closure member containing bag film over a cooled casting roller.
Claim 7
Independent Claim
95 words
An apparatus for producing an integrated bag film having a closure member comprising: a first extrusion means including a generally continuous extrusion slot having a relatively thinner first portion and a relatively thicker second portion for extruding a bag film web having a relatively thinner first portion and a relatively thicker second portion, a second extrusion means including an extrusion slot for extruding a closure member, and joining means positioned for joining said closure member to said second portion of said bag film web before said second portion has become cooled to an ambient temperature.
Claim 8
Independent Claim
95 words
An apparatus for producing an integrated bag film having a closure member comprising: a first extrusion means including a generally continuous extrusion slot having a relatively thinner first portion and a relatively thicker second portion for extruding a bag film web having a relatively thinner first portion and a relatively thicker second portion, a second extrusion means including an extrusion slot for extruding a closure member, and joining means positioned for joining said closure member to said second portion of said bag film web before said second portion has become cooled to an ambient temperature.
Claim 9
Dependent Claim
72 words
The apparatus of claim 6 wherein said first extrusion means comprises a slotted die, said first portion of said slotted die being generally rectangular in cross section and having a thickness of between about 0.020 and 0.040 inches, and said second portion of said slotted die being generally contoured in crossection and having a thickness of between about 0.030 and 0.080 inches and a width of between about 0.75 and 1.25 inches.
Claim 10
Dependent Claim
29 words
The apparatus of claim 7 wherein the ratio of the thickness of said second portion and said first portion of said slotted die is between about 1.5:1 and 2:1.
Claim 11
Dependent Claim
85 words
The apparatus of claim 6 further comprising a first casting roll means around which the bag film web is passed before said bag film web encounters said joining means, and wherein said joining means comprises a roller means positioned for receiving said bag film web and said closure member in a properly aligned relation and a chilled coating roll for cooling said closure member and said second portion of said bag film web to cause said closure member and second portio to become fused together.
Claim 12
Independent Claim
77 words
A method for forming plastic bag film for reclosable plastic bags comprising the steps of, extruding a bag film web having at least one portion thereof which is thicker than the remainder of said web and having relatively greater heat retention properties than the remainder of said web, applying a closure member to said thicker portion of said web before said thicker portion has cooled to an ambient temperature, and cooling said closure member and bag film.
Claim 13
Independent Claim
77 words
A method for forming plastic bag film for reclosable plastic bags comprising the steps of, extruding a bag film web having at least one portion thereof which is thicker than the remainder of said web and having relatively greater heat retention properties than the remainder of said web, applying a closure member to said thicker portion of said web before said thicker portion has cooled to an ambient temperature, and cooling said closure member and bag film.
Claim 14
Independent Claim
89 words
An apparatus for producing an integrated bag film having a closure member joined thereto comprising: a first extrusion die, including a generally continuous extrusion slot having at least one portion thereof with a cross-section wider than the remainder of said extrusion slot for extruding a bag film web having at least one portion thereof thicker than the remainder of said web, and joining means positioned for joining a closure member to said thicker portion of said bag film web before said thicker portion has cooled to an ambient temperature.
Claim 15
Independent Claim
89 words
An apparatus for producing an integrated bag film having a closure member joined thereto comprising: a first extrusion die, including a generally continuous extrusion slot having at least one portion thereof with a cross-section wider than the remainder of said extrusion slot for extruding a bag film web having at least one portion thereof thicker than the remainder of said web, and joining means positioned for joining a closure member to said thicker portion of said bag film web before said thicker portion has cooled to an ambient temperature.
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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) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |