US3754456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blank constructions for hermetically sealed cartons and methods of forming same
Assignee: Reynolds Metals Co
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Filing: 1971-05-27
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Granted: 1973-08-28
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Expires: 1991-05-27
Abstract
Abstract Blank constructions for use in making hermetically sealed, lined carton constructions formed continuously from strips of paperboard stock and liner material. An improved side seam construction is also disclosed wherein a paperboard-to-paperboard seal is obtained when using a liner material at least the outer surface of which is metal foil. The blank construction is formed by methods which permit one end of the liner material to overhang the paperboard stock material whereby covered side seams are provided which prevent air or liquid leakage through the pores of the paperboard stock. An R.F. induction heating method is disclosed for making side seams on lined cartons.
Inventors
- 👤 W Andrews
- 👤 V Serio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:03
CPC Classifications
B; B31; B31F; B31F7/00; B31F7/004; B29; B29C; B29C65/00; B29C65/02; B29C65/14; B29C65/1429; B29C65/1432; B29C65/1464; B29C65/34; B29C65/36; B29C65/3604; B29C65/3644; B29C65/3656; B29C65/3668; B29C65/3672; B29C65/3676; B29C65/368; B29C65/48; B29C65/4805; B29C65/481; B29C65/4815; B29C65/52; B29C65/54; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/4326; B29C66/49; B29C66/70; B29C66/72; B29C66/723; B29C66/7232; B29C66/72321; B29C66/72327; B29C66/72328; B29C66/80; B29C66/81; B29C66/818; B29C66/8181; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B31F1/00; B31F1/0003; B31F1/0006; B31F1/0009; B31F1/0019; B31F1/0029; B29C53/00; B29C53/36; B29C65/482; B29C66/7234; B29K; B29K2705/00; B29K2705/02; B29K2711/00; B29K2711/12; B29K2711/123; B29L; B29L2009/00; B29L2031/00; B29L2031/712; B29L2031/7162
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
301 words
A method of forming a side seam for a lined carton comprising the steps of 1. forming a paperboard blank having a liner material adhesively secured thereto, said liner material including a metallic foil portion into which R.F. energy may be inductively coupled, a. said paperboard blank having score lines thereon to define main panels and a glue flap thereon hingedly secured to one of said main panels with said glue flap having an unattached outer edge opposite its hinged securement to one of said main panels. b. said liner having an overhang portion which extends beyond the unattached outer edge of said glue flap, 2. feeding said paperboard blank continuously and while being fed continuously, performing the following additional steps: a. applying a first adhesive material to said glue flap, b. folding said overhang portion of said liner through approximately 180* in order to secure said over-hang portion to said first adhesive on said glue flap, c. applying a second adhesive material to one of the following: 1. the exterior surface of the liner material in the region of said glue flap, 2. the underside of the marginal edge of the main panel of said carton blank most remote from said glue flap, d. substantially completely folding said carton blank into substantially tubular shape so as to bring said main panel of said carton blank most remote from said glue falp to a position closely adjacent said glue flap, e. interposing an R.F. induction coil between said glue flap and said closely positioned main panel and inductively heating said metallic foil portion and, by contact with said metallic foil portion, thereby activating said second adhesive material, f. and, thereafter, pressing said glue flap and said main panel of said carton blank most remote therefrom together to complete said side seam.
Claim 2
Independent Claim
301 words
A method of forming a side seam for a lined carton comprising the steps of 1. forming a paperboard blank having a liner material adhesively secured thereto, said liner material including a metallic foil portion into which R.F. energy may be inductively coupled, a. said paperboard blank having score lines thereon to define main panels and a glue flap thereon hingedly secured to one of said main panels with said glue flap having an unattached outer edge opposite its hinged securement to one of said main panels. b. said liner having an overhang portion which extends beyond the unattached outer edge of said glue flap, 2. feeding said paperboard blank continuously and while being fed continuously, performing the following additional steps: a. applying a first adhesive material to said glue flap, b. folding said overhang portion of said liner through approximately 180* in order to secure said over-hang portion to said first adhesive on said glue flap, c. applying a second adhesive material to one of the following: 1. the exterior surface of the liner material in the region of said glue flap, 2. the underside of the marginal edge of the main panel of said carton blank most remote from said glue flap, d. substantially completely folding said carton blank into substantially tubular shape so as to bring said main panel of said carton blank most remote from said glue falp to a position closely adjacent said glue flap, e. interposing an R.F. induction coil between said glue flap and said closely positioned main panel and inductively heating said metallic foil portion and, by contact with said metallic foil portion, thereby activating said second adhesive material, f. and, thereafter, pressing said glue flap and said main panel of said carton blank most remote therefrom together to complete said side seam.
Claim 3
Dependent Claim
155 words
feeding said paperboard blank continuously and while being fed continuously, forming the following additional steps: a. applying a first adhesive material to said glue flap, b. folding said overhang portion of said liner through approximately 180* in order to secure said overhang portion to said first adhesive on said glue flap, c. substantially completely folding said carton blank into substantiAlly tubular shape so as to bring said main panel of said carton blank most remote from said glue flap to a position closely adjacent said glue flap, d. interposing an R.F. induction coil between said glue flap and said closely positioned main panel and inductively heating said metallic foil portion and, by contact with said metallic foil portion, thereby activating said adhesive plastic coating on the exterior surface of said liner, e. and, thereafter, pressing said glue flap and said main panel of said carton blank most remote therefrom together to complete said side seam.
Claim 4
Dependent Claim
155 words
feeding said paperboard blank continuously and while being fed continuously, forming the following additional steps: a. applying a first adhesive material to said glue flap, b. folding said overhang portion of said liner through approximately 180* in order to secure said overhang portion to said first adhesive on said glue flap, c. substantially completely folding said carton blank into substantiAlly tubular shape so as to bring said main panel of said carton blank most remote from said glue flap to a position closely adjacent said glue flap, d. interposing an R.F. induction coil between said glue flap and said closely positioned main panel and inductively heating said metallic foil portion and, by contact with said metallic foil portion, thereby activating said adhesive plastic coating on the exterior surface of said liner, e. and, thereafter, pressing said glue flap and said main panel of said carton blank most remote therefrom together to complete said side seam.
Claim 5
Dependent Claim
62 words
feeding said paperboard blank continuously and while being fed continuously, performing the following additional steps: a. applying a first adhesive material to said glue flap, b. folding said overhang portion of said liner through approximately 180* in order to secure said over-hang portion to said first adhesive on said glue flap, c. applying a second adhesive material to one of the following:
Claim 6
Dependent Claim
62 words
feeding said paperboard blank continuously and while being fed continuously, performing the following additional steps: a. applying a first adhesive material to said glue flap, b. folding said overhang portion of said liner through approximately 180* in order to secure said over-hang portion to said first adhesive on said glue flap, c. applying a second adhesive material to one of the following:
Claim 7
Dependent Claim
117 words
the underside of the marginal edge of the main panel of said carton blank most remote from said glue flap, d. substantially completely folding said carton blank into substantially tubular shape so as to bring said main panel of said carton blank most remote from said glue falp to a position closely adjacent said glue flap, e. interposing an R.F. induction coil between said glue flap and said closely positioned main panel and inductively heating said metallic foil portion and, by contact with said metallic foil portion, thereby activating said second adhesive material, f. and, thereafter, pressing said glue flap and said main panel of said carton blank most remote therefrom together to complete said side seam.
Claim 8
Dependent Claim
117 words
the underside of the marginal edge of the main panel of said carton blank most remote from said glue flap, d. substantially completely folding said carton blank into substantially tubular shape so as to bring said main panel of said carton blank most remote from said glue falp to a position closely adjacent said glue flap, e. interposing an R.F. induction coil between said glue flap and said closely positioned main panel and inductively heating said metallic foil portion and, by contact with said metallic foil portion, thereby activating said second adhesive material, f. and, thereafter, pressing said glue flap and said main panel of said carton blank most remote therefrom together to complete said side seam.
Claim 9
Dependent Claim
37 words
A method of forming a side seam for a lined carton as claimed in claim 1 including using an aqueous adhesive for said first adhesive material and using a hot melt adhesive for said second adhesive material.
Claim 10
Dependent Claim
36 words
A method of forming a side seam for a lined carton as claimed in claim 1 including the step of feeding said carton blanks in substantially a straight line throughout the formation of said side seam.
Claim 11
Dependent Claim
42 words
A method of forming a side seam for a lined carton as claimed in claim 1 including the step of feeding said blanks continuously at linear speeds in excess of 400 feet per minute in the course of forming said side seam.
Claim 12
Independent Claim
30 words
A method of forming a side seam for a lined carton with the liner thereof having an adhesive plastic coating on its exterior surface, said method comprising the steps of:
Claim 13
Independent Claim
30 words
A method of forming a side seam for a lined carton with the liner thereof having an adhesive plastic coating on its exterior surface, said method comprising the steps of:
Claim 14
Dependent Claim
30 words
A method of forming a side seam for a lined carton as defined in claim 5 including using an extruded coating on said liner material for said adhesive plastic coating.
Claim 15
Dependent Claim
36 words
A method of forming a side seam for a lined carton as defined in claim 5 including the step of feeding said carton blanks in substantially a straight line throughout the formation of said side seam.
Claim 16
Dependent Claim
37 words
A method of forming a side seam for a lined carton as defined in claim 5 including the step of using an R.F. induction coil having a length more than twice the length of said paperboard blank.
Claim 17
Dependent Claim
42 words
A method of forming a side seam for a lined carton as defined in claim 5 including the step of feeding said blanks continuously at linear speeds in excess of 400 feet per minute in the course of forming said side seam.
Claim 18
Dependent Claim
26 words
A method of forming a side seam for a lined carton as defined in claim 5 including the step of water cooling said R.F. induction coil.
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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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |