US4027455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packing containers with ripping thread opening and packing material webs for the manufacture of the packing containers
Assignee: Tetra Pak AB
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Filing: 1975-04-28
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Granted: 1977-06-07
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Expires: 1995-04-28
Abstract
Abstract In a packing container of the type comprising two sealing joints crossing each other whereby a sealing joint forms a sealing fin in which the packaging material is joined inside to outside, a ripping strip or thread is provided adjacent the inside of the sealing fin and with a portion thereof accessible from the exterior of the container.
Inventors
- 👤 Ruben Rausing
- 👤 Gert Nedstedt
- 👤 Hakan Holmstrom
- 👤 Lars-Erik Palm
- 👤 Stjepan Stefan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:51
CPC Classifications
B; B65; B65D; B65D5/00; B65D5/02; B65D5/06; B65D5/064; B65D5/065; B65B; B65B61/00; B65B61/18; B65B61/182; B65D75/00; B65D75/52; B65D75/58; B65D75/66; B65D75/68; B31; B31B; B31B50/00; B31B50/74; B31B50/81; B31B50/812; B31B50/8125
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
303 words
In a method of continuously producing containers from a web of carton forming material having a layer of thermoplastic material on that side which will form the inside of the container, which includes forming the web into a longitudinal tube-like member, sealing together the longitudinal edges thereof, filling the tube-like member with a filling material, forming spaced face-to-face seals transversely of the length of the tube-like member to form a plurality of interconnected containers and cutting through the transverse seals longitudinally thereof to separate the packages from one another, the improvement comprising securing the substantially parallel legs of each of a plurality of substantially U-shaped tear threads to the layer of thermoplastic material at spaced locations along the length of the web and transversely thereof, the spaced locations of the parallel legs of each tear thread being juxtaposed the inner edge of the location where the transverse face-to-face seal is to be formed, the loop-like portion of each tear thread extending beyone one marginal edge of the web so that the inner portions of the parallel legs pass transversely through the longitudinal seal when sealing the edges of the web to form the tube-like member, folding the extended loop-like portions back against the side of the web which will form the outside of the container and away from the location where the transverse seal is to be formed and releasably securing the folded loop-like portions to the web so that each tear thread and extended loop-like portion thereof for each container will remain intact when cutting the transverse seals to separate the containers, the extended loop-like portions of each tear thread forming an external grip for pulling the thread to open the container by separating at least a portion of the adjacent face-to-face transverse seal to provide access to the filling material therein.
Claim 2
Dependent Claim
303 words
In a method of continuously producing containers from a web of carton forming material having a layer of thermoplastic material on that side which will form the inside of the container, which includes forming the web into a longitudinal tube-like member, sealing together the longitudinal edges thereof, filling the tube-like member with a filling material, forming spaced face-to-face seals transversely of the length of the tube-like member to form a plurality of interconnected containers and cutting through the transverse seals longitudinally thereof to separate the packages from one another, the improvement comprising securing the substantially parallel legs of each of a plurality of substantially U-shaped tear threads to the layer of thermoplastic material at spaced locations along the length of the web and transversely thereof, the spaced locations of the parallel legs of each tear thread being juxtaposed the inner edge of the location where the transverse face-to-face seal is to be formed, the loop-like portion of each tear thread extending beyone one marginal edge of the web so that the inner portions of the parallel legs pass transversely through the longitudinal seal when sealing the edges of the web to form the tube-like member, folding the extended loop-like portions back against the side of the web which will form the outside of the container and away from the location where the transverse seal is to be formed and releasably securing the folded loop-like portions to the web so that each tear thread and extended loop-like portion thereof for each container will remain intact when cutting the transverse seals to separate the containers, the extended loop-like portions of each tear thread forming an external grip for pulling the thread to open the container by separating at least a portion of the adjacent face-to-face transverse seal to provide access to the filling material therein.
Claim 3
Dependent Claim
32 words
In a method as claimed in claim 1 the improvement wherein at least a portion of the parallel legs of the tear threads are secured to the layer of the thermoplastic material.
Claim 4
Dependent Claim
35 words
In a method as claimed in claim 1 the improvement wherein the tear threads are coated with a thermoplastic material having a softening point at least as low as the thermoplastic material forming the layer.
Claim 5
Dependent Claim
60 words
In a method as claimed in claim 1 the improvement wherein the tear threads are each composed of a plurality of entwined fine threads composed of a plastic material and wherein the substantially parallel legs of the tear threads are secured to the layer of thermoplastic material by heat pressing the threads thereagainst to secure and flatten the tear threads.
Claim 6
Dependent Claim
52 words
In a method as claimed in claim 4 the improvement wherein each of the fine threads is coated with a thermoplastic material having a softening point below that of the fine threads and wherein the entwined tear threads are coated with the same thermoplastic material as is coated on each fine thread.
Claim 7
Dependent Claim
42 words
In a method as claimed in claim 3 wherein the tear theads are composed of a polyester and the coating on said tear threads is a material selected from the group consisting of a polyolefin and a mixture thereof with a wax.
Claim 8
Dependent Claim
22 words
In a method as claimed in claim 1 the improvement wherein said tear threads are composed of single homogeneous flat plastic bands.
Claim 9
Dependent Claim
36 words
In a method as claimed in claim 1 the improvement wherein at least the substantially parallel legs of each tear thread secured to the layer of thermoplastic material is thinner than the thickness of the layer.
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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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |