US4392897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacturing process for channel seal
Assignee: Pactiv LLC
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Filing: 1982-04-05
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Granted: 1983-07-12
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Expires: 2002-04-05
Abstract
Abstract Molten thermoplastic, such as polyethylene, and a hot melt adhesive are coextruded through a channel shaped profile die. While still molten, the channel shaped strip, having adhesive between the ribs thereof, is brought into contact with a moving web of a thermoplastic, e.g. polyethylene film, which is backed up by a roll at a controlled temperature. The temperature differential between the roll and the molten thermoplastic is maintained so that the thermoplastic adheres to the moving web upon contact and thereafter cools to set the thermoplastic in the channel shaped profile. The web is under tension so that contraction of the film upon release compensates for the contraction of the channel shaped strip as it cools.
Inventors
- 👤 Fox J. Herrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:41
CPC Classifications
B; B65; B65D; B65D33/00; B65D33/16; B65D33/1691; B29; B29C; B29C37/00; B29C37/0078; B29C37/0082; B29C48/00; B29C48/16; B29C48/18; B29C48/22; B29C48/001; B29C48/03; B29C48/07; B29C48/08; B29C48/12; B29C65/00; B29C65/02; B29C65/022; B29C65/028; B29L; B29L2005/00; B31; B31B; B31B70/00; B31B70/74; B31B70/81; B31B70/813; B31B70/8131; B31B70/8132; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1015; Y10T156/17; Y10T156/1798; Y10T24/00; Y10T24/25; Y10T24/2532; Y10T24/2534
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
154 words
Apparatus for attaching a channel shaped strip containing adhesive to a plastic film, said strip having ribs along each side, said adhesive being between said ribs and having a thickness less than the interior height of said ribs, comprising: means for moving a web of said film; a coextruding assembly positioned adjacent to said moving die comprising: means for extruding a channel shaped strip; means for applying a layer of adhesive into said channel strip between the ribs thereof; means for supplying molten thermoplastic to said coextruding assembly; means for supplying molten adhesive to said adhesive applicator; and means for maintaining a temperature differential between said extruded channel strip and said moving web as said extruded channel is applied to said moving web so that said extruded channel adheres to said moving web upon contact and thereafter cools to set said thermoplastic in said channel shaped strip having pressure sensitive adhesive between said ribs.
Claim 2
Dependent Claim
154 words
Apparatus for attaching a channel shaped strip containing adhesive to a plastic film, said strip having ribs along each side, said adhesive being between said ribs and having a thickness less than the interior height of said ribs, comprising: means for moving a web of said film; a coextruding assembly positioned adjacent to said moving die comprising: means for extruding a channel shaped strip; means for applying a layer of adhesive into said channel strip between the ribs thereof; means for supplying molten thermoplastic to said coextruding assembly; means for supplying molten adhesive to said adhesive applicator; and means for maintaining a temperature differential between said extruded channel strip and said moving web as said extruded channel is applied to said moving web so that said extruded channel adheres to said moving web upon contact and thereafter cools to set said thermoplastic in said channel shaped strip having pressure sensitive adhesive between said ribs.
Claim 3
Dependent Claim
50 words
The apparatus recited in claim 1 wherein said means for moving a web of said film includes a backup roller, said coextruding assembly being positioned adjacent to said backup roller to apply said channel shaped adhesive strip to said moving web on the side thereof opposite from said backup roller.
Claim 4
Dependent Claim
82 words
The apparatus recited in claim 1 wherein said means for maintaining a temperature differential comprises; a first heater for said backup roller for maintaining said moving web at a first temperature; a second heater for said means for supplying said molten thermoplastic to said coextruding assembly at a second temperature; and means for maintaining said second temperature of said molten thermoplastic higher than said first temperature of said moving web of film as the extruded channel is applied to said moving web.
Claim 5
Dependent Claim
45 words
The apparatus recited in claim 1 further comprising: means for maintaining said moving web of film under tension so that contraction of the film upon release, compensates for the contraction of said channel shaped strip as it cools to prevent puckering of said moving web.
Claim 6
Dependent Claim
32 words
The apparatus recited in claim 1 wherein said adhesive applicator includes a reservoir for said adhesive; and means for supplying adhesive under pressure from said reservoir across the width of said strip.
Claim 7
Dependent Claim
35 words
The apparatus recited in claim 5 wherein a plurality of V-shaped notches extend from said reservoir to openings adjacent said moving web, so that said V-shaped notches supply adhesive across the width of said strip.
Claim 8
Dependent Claim
33 words
The apparatus recited in claim 5 wherein a single slot extends from said reservoir to an opening adjacent said moving web, so that the slot supplies adhesive across the width of said strip.
Claim 9
Dependent Claim
54 words
The apparatus recited in claim 1 wherein said web of film moves at a speed greater than the speed of extrusion of said channel from molten thermoplastic through said die, so that the dimensions of the channel strip deposited on said moving web are smaller than the dimensions of said channel profile extrusion die.
Claim 10
Dependent Claim
29 words
The apparatus recited in claim 8 wherein the opening in said channel profile extrusion die is about two to about four times the dimension of said channel shaped strip.
Claim 11
Dependent Claim
76 words
The apparatus recited in claim 1 wherein said channel profile extrusion die comprises; a channel die block having rib forming grooves cut into one surface of said shaping block and a groove cut into said one surface connecting said notches, said notches and said groove forming a channel profile; and a flat block with a flat surface facing said one surface of said shaping block to close the open side of said channel profile extrusion die.
Claim 12
Dependent Claim
97 words
The apparatus recited in claim 10 wherein said means for applying adhesive comprises an adhesive shaping block having in one surface thereof an adhesive reservoir and a plurality of V-shaped notches between said reservoir and the edge of said adhesive shaping block so that adhesive flows from said reservoir through said notches into the width of said strip between the ribs thereof, said one surface of said adhesive shaping block being positioned against a flat surface of said channel die block which is orthoganal to said one surface and in the direction of movement of said web.
Claim 13
Dependent Claim
95 words
The apparatus recited in claim 10 wherein said means for applying adhesive comprises an adhesive shaping block having in one surface thereof an adhesive reservoir and a single slot between said reservoir and the edge of said adhesive shaping block so that adhesive flows from said reservoir through said slot into the width of said strip between the ribs thereof, said one surface of said adhesive shaping block being positioned against a flat surface of said channel die block which is orthoganal to said one surface and in the direction of movement of said web.
Claim 14
Dependent Claim
40 words
The apparatus recited in claim 10 further comprising: a feed block, said channel die block being positioned against said feed block, said feed block having a conduit connecting said channel profile extrusion die with said means for supplying molten thermoplastic.
Claim 15
Dependent Claim
44 words
The apparatus recited in claim 11 or 12 further comprising: a manifold assembly comprising a plurality of coextruding assemblies wherein the feed block for each coextruding assembly is part of a manifold unit for supplying adhesive and thermoplastic to each of said shaping portions.
Claim 16
Dependent Claim
31 words
The apparatus recited in claim 1 furtber comprising: a plurality of said coextruding assemblies and a manifold unit supplying molten thermoplastic and adhesive to the shaping portion of each coextruding assembly.
Claim 17
Dependent Claim
25 words
The apparatus recited in claim 15 wherein said manifold unit comprises a bore through which molten thermoplastic is supplied to said channel profile extrusion die.
Claim 18
Dependent Claim
34 words
The apparatus recited in claim 16 further comprising: a metering screw for each channel profile extrusion die in said manifold assembly for regulating the flow of molten thermoplastic from said bore into said dies.
Claim 19
Dependent Claim
28 words
The apparatus recited in claim 15 wherein said manifold unit has means for recirculating adhesive past bores which supply said adhesive to each of said adhesive shaping blocks.
Claim 20
Dependent Claim
39 words
The apparatus recited in claim 18 wherein said means for recirculating adhesive comprises a feed bore, a return bore, and a channel for connecting the terminal end of said feed bore to the starting end of said return bore.
Claim 21
Dependent Claim
29 words
The apparatus recited in claim 18 further comprising: a metering screw for each of said adhesive shaping block to control the flow of adhesive to said adhesive shaping blocks.
Claim 22
Dependent Claim
19 words
The apparatus recited in claim 1 wherein said means for supplying adhesive is a hot melt adhesive applicator pump.
Claim 23
Dependent Claim
17 words
The apparatus recited in claim 1 wherein said means for supplying molten thermoplastic is a polymer pump.
Claim 24
Dependent Claim
20 words
The apparatus recited in claim 22 wherein said polymer comprises polyethylene and wherein said moving web of film comprises polyethylene.
Claim 25
Dependent Claim
140 words
Apparatus for attaching a channel shaped adhesive strip having ribs along each side and an adhesive layer between said ribs to a plastic film comprising: means for moving a web of said film; a coextruding assembly positioned adjacent to said moving web having: a channel profile extrusion die; means for supplying molten thermoplastic to said die to extrude a channel shaped strip of thermoplastic having ribs along each side which is deposited on said moving web; means for applying a layer of adhesive across the width of said strip between the ribs thereof; means for supplying molten adhesive to said applicator means; and means for maintaining said moving web of film under tension so that contraction of the film upon release compensates for the contraction of said channel shaped strip as it cools to prevent puckering of said moving web.
Claim 26
Dependent Claim
140 words
Apparatus for attaching a channel shaped adhesive strip having ribs along each side and an adhesive layer between said ribs to a plastic film comprising: means for moving a web of said film; a coextruding assembly positioned adjacent to said moving web having: a channel profile extrusion die; means for supplying molten thermoplastic to said die to extrude a channel shaped strip of thermoplastic having ribs along each side which is deposited on said moving web; means for applying a layer of adhesive across the width of said strip between the ribs thereof; means for supplying molten adhesive to said applicator means; and means for maintaining said moving web of film under tension so that contraction of the film upon release compensates for the contraction of said channel shaped strip as it cools to prevent puckering of said moving web.
Claim 27
Independent Claim
108 words
A method of attaching a channel shaped adhesive strip having ribs along each side and an adhesive layer between said ribs to a plastic film comprising: moving a web of said film past a coextruding assembly; extruding a channel shaped strip of thermoplastic onto said moving web; applying a layer of adhesive between the ribs of said strip; and maintaining a temperature differential between said molten thermoplastic and said moving web so that said extruded thermoplastic channel strip adheres to said moving web upon contact and thereafter cools to set said extruded thermoplastic channel strip in said channel profile with said adhesive between the ribs of said strip.
Claim 28
Independent Claim
108 words
A method of attaching a channel shaped adhesive strip having ribs along each side and an adhesive layer between said ribs to a plastic film comprising: moving a web of said film past a coextruding assembly; extruding a channel shaped strip of thermoplastic onto said moving web; applying a layer of adhesive between the ribs of said strip; and maintaining a temperature differential between said molten thermoplastic and said moving web so that said extruded thermoplastic channel strip adheres to said moving web upon contact and thereafter cools to set said extruded thermoplastic channel strip in said channel profile with said adhesive between the ribs of said strip.
Claim 29
Dependent Claim
56 words
The method recited in claim 25 wherein the step of maintaining a temperature differential includes: heating said molten thermoplastic to a first temperature; heating a backup roller over which said web of film moves to a second temperature; and maintaining said first temperature of said molten thermoplastic higher than said second temperature of said backup roller.
Claim 30
Dependent Claim
43 words
The method recited in claim 26 further comprising: maintaining said moving web of film under tension so that upon release contraction of the film compensates for the contraction of said channel shaped strip as it cools to prevent puckering of said moving web.
Claim 31
Dependent Claim
19 words
The method recited in claim 25 further comprising: applying said adhesive under pressure across the width of said strip.
Claim 32
Dependent Claim
51 words
The method recited in claim 25 further comprising: extruding a channel shaped thermoplastic strip having dimensions larger than the desired final dimensions; and moving said web of film at a speed greater than the speed extrusion of said molten thermoplastic to draw said channel strip down to the desired final dimensions.
Claim 33
Dependent Claim
28 words
The method recited in claim 25 performed with a plurality of said coextruding assemblies; and supplying molten thermoplastic and adhesive through a manifold unit to said coextruding assemblies.
Claim 34
Dependent Claim
13 words
The method recited in claim 30 further comprising: recirculating adhesive in said manifold.
Claim 35
Independent Claim
98 words
A method of attaching a channel shaped adhesive strip having ribs along each side and an adhesive layer between said ribs to a plastic film comprising: moving a web of said film past a coextruding assembly; extruding a channel shaped strip of thermoplastic onto said moving web; applying a layer of adhesive between the ribs of said strip; and tensioning said moving web of film as it passes said coextruding assembly so that contraction of the film upon release compensates for the contraction of said channel shaped strip as it cools to prevent puckering of said moving web.
Claim 36
Independent Claim
98 words
A method of attaching a channel shaped adhesive strip having ribs along each side and an adhesive layer between said ribs to a plastic film comprising: moving a web of said film past a coextruding assembly; extruding a channel shaped strip of thermoplastic onto said moving web; applying a layer of adhesive between the ribs of said strip; and tensioning said moving web of film as it passes said coextruding assembly so that contraction of the film upon release compensates for the contraction of said channel shaped strip as it cools to prevent puckering of said moving web.
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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) | 1986-07-11 | 1987-01-10 | 1987-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-11 | 1991-01-10 | 1991-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-11 | 1995-01-10 | 1995-07-12 | $7700.00 | Window Closed / Lapsed |