EP0143457A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for covering continuous articles
Assignee: Ube Corp
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Filing: 1984-11-28
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Granted: —
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Expires: 2004-11-28
Abstract
Abstract A continuous article such as steel pipe is covered with a heat-shrinkable covering sheet comprised of a heat-shrinkable plastic layer and a heat-bonding adhesive layer by a process wherein the covering sheet is wound around the periphery of the continuous article, both ends of the covering sheet are lapped together, a heat-sealing tape is further lapped on the lapping portion of the covering sheet to form a tube of the covering sheet, and then the tube is heated to thereby shrink toward the periphery of the continuous article. The heat-sealing tape is characterized by having a heat-bonding adhesive layer formed on one surface of a plastic layer heat-shrinkable in the width direction of the tape. This heat-sealing tape is lapped on the lapping portion of the covering sheet so that the heat-shrinking direction of the heat-shrinkable tape is the same as the heat-shrinking direction of the covering sheet.
Inventors
- 👤 Kaoru Sawanishi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 20:03
CPC Classifications
B; B29; B29C; B29C61/00; B29C61/06; B29C61/10; B29C61/0608; B29C61/0616; B29C65/00; B29C65/02; B29C65/10; B29C65/106; B29C65/14; B29C65/48; B29C65/4805; B29C65/481; B29C65/4815; B29C66/00; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/49; B29C66/50; B29C66/51; B29C66/53; B29C66/532; B29C66/5326; B29C66/70; B29C66/73; B29C66/737; B29C66/7371; B29C66/73715; F; F16; F16L; F16L58/00; F16L58/18; F16L58/181; B29C65/50; B29C65/5042; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/71; B29K; B29K2023/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
214 words
A method for covering the periphery of a continuous article with a heat-shrinkable covering sheet comprising a plastic layer having a heat shrinkability and a heat-bonding adhesive layer, wherein the heat-shrinkable covering sheet is wound around the periphery of the continuous article, both ends of the covering sheet are lapped together, a heat-sealing tape is further lapped on the lapping portion of the covering sheet to form a tubular member of the covering sheet, and then the tubular member of the covering sheet is heated to thereby shrink toward the periphery of the continuous article, characterized in that a heat-sealing tape having a heat-bonding adhesive layer formed on one surface of a plastic layer capable of being shrunk in the width direction of the tape is lapped on the lapping portion of the heat-shrinkable covering sheet wound around the periphery of the continuous article so that the heat-shrinking direction of the heat-sealing tape is the same as the heat-shrinking direction of the heat-shrinkable covering sheet and the adhesive layer of the heat-sealing tape is brought in close contact with the surface of said lapping portion of the heat-shrinkable covering sheet, heating is then effected to integrate the heat-sealing tape with the heat-shrinkable covering sheet to form the tubular member of the heat-shrinkable covering sheet.
Claim 2
Independent Claim
214 words
A method for covering the periphery of a continuous article with a heat-shrinkable covering sheet comprising a plastic layer having a heat shrinkability and a heat-bonding adhesive layer, wherein the heat-shrinkable covering sheet is wound around the periphery of the continuous article, both ends of the covering sheet are lapped together, a heat-sealing tape is further lapped on the lapping portion of the covering sheet to form a tubular member of the covering sheet, and then the tubular member of the covering sheet is heated to thereby shrink toward the periphery of the continuous article, characterized in that a heat-sealing tape having a heat-bonding adhesive layer formed on one surface of a plastic layer capable of being shrunk in the width direction of the tape is lapped on the lapping portion of the heat-shrinkable covering sheet wound around the periphery of the continuous article so that the heat-shrinking direction of the heat-sealing tape is the same as the heat-shrinking direction of the heat-shrinkable covering sheet and the adhesive layer of the heat-sealing tape is brought in close contact with the surface of said lapping portion of the heat-shrinkable covering sheet, heating is then effected to integrate the heat-sealing tape with the heat-shrinkable covering sheet to form the tubular member of the heat-shrinkable covering sheet.
Claim 3
Dependent Claim
28 words
A method for covering a continuous article according to claim 1, wherein the thermal shrinkage factor of the plastic layer of the heat-sealing tape is 5 to 25%.
Claim 4
Dependent Claim
57 words
A method for covering a continuous article according to claim 1, wherein the adhesive layer of the heat-sealing tape is an adhesive layer of a heat-bonding crosslinked polymer obtained by partially crosslinking an adhesive composition comprising as main components a polyolefin and a tackifier, and the plastic layer of the heat-sealing tape is a crosslinked polyolefin layer.
Claim 5
Independent Claim
55 words
A method for covering a continuous article according to any of claims 1 through 3, wherein the tubular member of the covering sheet is formed by heating the heat-sealing tape on the lapping portion of the heat-shrinkable covering sheet under conditions such that at least about 1/2 of the heat-shrinkability of the heat-sealing tape remains.
Claim 6
Independent Claim
79 words
A method for covering a continuous article according to any of claims 1 through 4, wherein the plastic layer of the heat-sealing tape is prepared by forming a polyolefin film or sheet having a thickness of about 50 to 2000 pm, drawing the polyolefin film or sheet at a temperature of about 80 to 200°C, and then crosslinking the polyolefin film or sheet to an extent such that the gel fraction of the polyolefin is about 20 to 90%.
Claim 7
Dependent Claim
55 words
A method for covering a continuous article according to claim 3 wherein the adhesive layer of a heat-bonding crosslinked polymer has a shear strength of 0.1 to 5 kg/cm 2 as determiend at 100°C and 0.01 to 0.8 kg/cm 2 as determined at 150°C, to the surfaces of both ends of the heat-shrinkable covering sheet.
Claim 8
Dependent Claim
77 words
A method for covering a continuous article according to claim 3 wherein the adhesive layer of a heat-bonding crosslinked polymer is prepared by a process wherein an adhesive composition comprising, based on the total weight of the adhesive composition, about 50 to 95% by weight of a polyolefin and about 5 to 50% by weight of a tackifier is partially crosslinked to an extent such that the gel fraction of the polyolefin is about 5 to 50%.
Claim 9
Independent Claim
71 words
A method for covering a continuous article according to any of claims 1 to 7, wherein the heat-sealing tape has a thickness of about 0.2 to 4 mm, the adhesive layer has a thickness of about 0.1 to 3.0 mm, the plastic layer has a thickness of about 0.05 to 2.5 mm, and the ratio in thickness of the adhesive layer to the plastic layer is about 1/10 to about 3/1.
Claim 10
Independent Claim
96 words
A method for covering a continuous article according to any of claims 1 to 8, wherein the heat-shrinkable covering sheet is composed of the crosslinked plastic layer having a heat shrinkability and the heat-bondable adhesive layer formed on one surface of the crosslinked plastic layer, said crosslinked plastic layer having a heat-shrinking temperature of about 80 to about 200°C, a thermal shrinkage factor of about 15 to about 80% and a gel fraction of about 20 to about 90%, and said heat-bondable adhesive layer exhibiting a peeling strength of 1 to 25 kg/cm at normal temperature.
References Cited (Backward Citations)
No citation records indexed.
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