US3570375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of manufacturing plastic bags
Assignee: Amcor Flexibles North America Inc
•
Filing: 1968-05-14
•
Granted: 1971-03-16
•
Expires: 1988-05-14
Abstract
Abstract A method of manufacturing plastic bags with a plastic tape folded around one end of the bag and heat-sealed to the bag walls with heat-seal-inhibiting material precluding sealing together of the walls where the tape is sealed to the walls. A method of manufacturing plastic bags with a heat-sealed pinch-type closure with heat-seal-inhibiting material precluding sealing together of the walls where the closure is sealed. A method of manufacturing plastic bags with an interrupted or vented heat-sealed longitudinal seam with heat-seal-inhibiting material in a pattern for forming the interrupted or vented longitudinal seam. A method of manufacturing plastic bags with a valve sleeve sealed in a heat-sealed longitudinal seam with heat-seal-inhibiting material on the inside of the sleeve to preclude sealing together of the walls of the sleeve.
Inventors
- 👤 Milton J Heimos
- 👤 Russell J Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:13
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/004; B29C65/00; B29C65/02; B29C65/10; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/13; B29C66/135; B29C66/1352; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/70; B29C66/71; B31; B31B; B31B70/00; B31B70/60; B31B70/64; B31B70/74; B31B70/81; B31B70/84; B31B70/85
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
104 words
The method of making bags of flexible heat-sealable sheet material comprising applying to one face of a web of said material stripes of heat-seal-inhibiting material extending transversely of the web and spaced at bag length intervals, forming the web into tubing with the stripes on the inside of the tubing; segmenting the tubing into individual bag tubes each having a stripe of said heat-seal-inhibiting material on the inside thereof and adjacent one end thereof, and then forming a heat-sealed end closure at said one end of each tube with said stripe precluding heat-sealing together of the walls of the tube inward of the closure.
Claim 2
Independent Claim
104 words
The method of making bags of flexible heat-sealable sheet material comprising applying to one face of a web of said material stripes of heat-seal-inhibiting material extending transversely of the web and spaced at bag length intervals, forming the web into tubing with the stripes on the inside of the tubing; segmenting the tubing into individual bag tubes each having a stripe of said heat-seal-inhibiting material on the inside thereof and adjacent one end thereof, and then forming a heat-sealed end closure at said one end of each tube with said stripe precluding heat-sealing together of the walls of the tube inward of the closure.
Claim 3
Dependent Claim
107 words
The method of claim 1 wherein said end closure is formed by folding a tape of flexible heat-sealable sheet material around said one end of the tube and effecting heat-sealing of one side of the tape to the outside of one wall of the tube and heat-sealing of the other side of the tape to the outside of the other wall of the tube along a line of seal extending transversely of the tube throughout the width of the tube, said line of seal being in register with said stripe and the latter precluding heat-sealing together of the walls of the tube along said line of seal.
Claim 4
Dependent Claim
121 words
The method of claim 1 wherein said tubes are segmented on lines such that each has a stripe spaced inward from one end of the tube, said end closure being formed by folding the end portion of the tube lying outward of said stripe over on the outside of one of the walls of the tube, and by heat-sealing together the portions of said walls included in said end portion and the outside face of said one wall of the tube along a line of seal extending transversely of the tube throughout the width of the tube, said line being in register with said stripe and the latter precluding heat-sealing together of the walls of the tube inward of the closure.
Claim 5
Independent Claim
124 words
The method of forming an end closure at the mouth of a filled open-mouth bag made of flexible heat-sealable sheet material comprising spreading open lip portions of the walls of the bag at the mouth of the bag, applying a coating of heat-seal-inhibiting material to at least one of these lips, bringing the lips back together, folding a tape of flexible heat-sealable sheet material over the lips, and heat-sealing one side of the tape to the outside of one lip and the other side of the tape to the outside of the other lip along a line of seal extending transversely of the bag throughout the width of the bag in register with said coating, the latter precluding heat-sealing together face-to-face of said lips.
Claim 6
Independent Claim
124 words
The method of forming an end closure at the mouth of a filled open-mouth bag made of flexible heat-sealable sheet material comprising spreading open lip portions of the walls of the bag at the mouth of the bag, applying a coating of heat-seal-inhibiting material to at least one of these lips, bringing the lips back together, folding a tape of flexible heat-sealable sheet material over the lips, and heat-sealing one side of the tape to the outside of one lip and the other side of the tape to the outside of the other lip along a line of seal extending transversely of the bag throughout the width of the bag in register with said coating, the latter precluding heat-sealing together face-to-face of said lips.
Claim 7
Independent Claim
99 words
The method of making bag tubes of flexible heat-sealable sheet material comprising applying to one face of one margin of a web of said material a coating of heat-seal-inhibiting material in a predetermined pattern extending longitudinally of the web and outlining a predetermined heat-seal pattern, forming the web into tubing with said one margin lapping the other margin of the web and with said coating between said lapping margins, and applying heat and pressure to said lapping margins to effect face-to-face sealing of said margins in said heat-seal pattern excluding sealing of said margins where inhibited by said coating.
Claim 8
Independent Claim
99 words
The method of making bag tubes of flexible heat-sealable sheet material comprising applying to one face of one margin of a web of said material a coating of heat-seal-inhibiting material in a predetermined pattern extending longitudinally of the web and outlining a predetermined heat-seal pattern, forming the web into tubing with said one margin lapping the other margin of the web and with said coating between said lapping margins, and applying heat and pressure to said lapping margins to effect face-to-face sealing of said margins in said heat-seal pattern excluding sealing of said margins where inhibited by said coating.
Claim 9
Dependent Claim
23 words
The method of claim 5 wherein the pattern of said coating is such as to provide an interrupted heat seal between said margins.
Claim 10
Dependent Claim
34 words
The method of claim 6 wherein the pattern of said coating is such as to provide an interrupted heat seal comprising spaced transversely extending sealed areas and a continuous longitudinal seal traversing said areas.
Claim 11
Dependent Claim
26 words
The method of claim 5 wherein the pattern of said coating is such as to leave gaps in the seal between said margins for venting purposes.
Claim 12
Independent Claim
134 words
The method of making a valve bag of flexible heat-sealable sheet material with a valve sleeve of flexible heat-sealable sheet material comprising applying to one face of a strip of flexible heat-sealable sheet material stripes of heat-seal-inhibiting material extending transversely across the strip and spaced at valve sleeve length intervals, forming said strip into tubing with the stripes on the inside of the tubing, segmenting the tubing into individual sleeves on lines spaced at sleeve length intervals and intermediate said stripes so that each sleeve has a stripe intermediate its ends, inserting each sleeve between portions of a bag tube formed from flexible heat-sealable sheet material, and heat-sealing said sleeve in place between said portions along a line in register with said stripe, the latter precluding sealing together of opposite sides of the sleeve.
Claim 13
Independent Claim
134 words
The method of making a valve bag of flexible heat-sealable sheet material with a valve sleeve of flexible heat-sealable sheet material comprising applying to one face of a strip of flexible heat-sealable sheet material stripes of heat-seal-inhibiting material extending transversely across the strip and spaced at valve sleeve length intervals, forming said strip into tubing with the stripes on the inside of the tubing, segmenting the tubing into individual sleeves on lines spaced at sleeve length intervals and intermediate said stripes so that each sleeve has a stripe intermediate its ends, inserting each sleeve between portions of a bag tube formed from flexible heat-sealable sheet material, and heat-sealing said sleeve in place between said portions along a line in register with said stripe, the latter precluding sealing together of opposite sides of the sleeve.
Claim 14
Dependent Claim
46 words
The method of claim 9 wherein the bag tube has a longitudinal seam including overlapping margins of the bag tube material, the sleeve being inserted between said margins with the stripe in register with said margins, and said seam being heat-sealed after insertion of the sleeve.
Claim 15
Independent Claim
96 words
The method of making bags of flexible heat-sealable sheet material comprising applying heat-seal-inhibiting material to one face of a web of said material; forming the web into tubing with said heat-seal-inhibiting material on the inside of the tubing; segmenting the tubing into individual bag tubes each having heat-seal-inhibiting material on the inside thereof and adjacent one end thereof, and then forming a heat-sealed end closure at said one end of each tube with said heat-seal-inhibiting material precluding heat-sEaling together of the walls of the tube inward of the closure in the region of said heat-seal-inhibiting material.
Claim 16
Independent Claim
96 words
The method of making bags of flexible heat-sealable sheet material comprising applying heat-seal-inhibiting material to one face of a web of said material; forming the web into tubing with said heat-seal-inhibiting material on the inside of the tubing; segmenting the tubing into individual bag tubes each having heat-seal-inhibiting material on the inside thereof and adjacent one end thereof, and then forming a heat-sealed end closure at said one end of each tube with said heat-seal-inhibiting material precluding heat-sEaling together of the walls of the tube inward of the closure in the region of said heat-seal-inhibiting material.
Claim 17
Dependent Claim
98 words
The method of claim 11 wherein said end closure is formed by folding a tape of flexible heat-sealable sheet material around said one end of the tube and effecting heat-sealing of one side of the tape to the outside of one wall of the tube and heat-sealing of the other side of the tape to the outside of the other wall of the tube along a line of seal extending transversely of the tube, said heat-seal-inhibiting material precluding heat-sealing together of the walls of the tube along said line of seal in the region of said heat-seal-inhibiting material.
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |