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Heat-sealable laminate and method for producing same
US9789670B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9789670-B2 |
| Application number | US-201013388350-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 11, 2010 |
| Priority date | Aug 11, 2009 |
| Publication date | Oct 17, 2017 |
| Grant date | Oct 17, 2017 |
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- Title
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Abstract
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[Problems to be Solved] To coat homopolyethylene terephthalate, which is inexpensive and easily available, on a paper base material directly, not via an adhesive layer, by extrusion coating, thereby providing a paper laminate having heat sealability and having a homopolyethylene terephthalate coating of a uniform film thickness formed thereon. [Means to Solve the Problems] A method for producing a paper laminate having a coating comprising homopolyethylene terephthalate formed on at least one surface of a paper base material by extrusion coating is characterized in that an air gap L, expressed as a distance from a lip opening of a T-die to a paper base material B, is 25 cm or less.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing, by an extrusion coating method, a heat-sealable laminate by directly applying a heat-sealable coating composed of a homopolyethylene terephthalate onto the surface of a paper substrate or onto the surface of an aluminum foil laminated on the surface of the paper substrate, wherein said homopolyethylene terephthalate has an intrinsic viscosity in a range of from 0.72 to 0.88 dl/g, the temperature of the homopolyethylene terephthalate when it is melt-extruded by the extrusion-coating method is in a range of from Tm+25° C. to Tm+60° C. based on a melting point (Tm) of said homopolyethylene terephthalate, the extrusion pressure is in a range of from 4.0 to 6.0 MPa, and an air gap, expressed as a distance of from a lip opening of a T-die to the surface of the paper substrate or to the surface of the aluminum foil, is 25 cm or less, and a thickness of the homopolyethylene terephthalate coating varies in a range of less than ±20%.
Assignees
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Classifications
of paper or cardboard · CPC title
Synthetic resin or polymer · CPC title
- B32B27/36Primary
comprising polyesters · CPC title
Layered products comprising {a layer of} paper or cardboard · CPC title
Paper containing [e.g., paperboard, cardboard, fiberboard, etc.] · CPC title
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- What does patent US9789670B2 cover?
- [Problems to be Solved] To coat homopolyethylene terephthalate, which is inexpensive and easily available, on a paper base material directly, not via an adhesive layer, by extrusion coating, thereby providing a paper laminate having heat sealability and having a homopolyethylene terephthalate coating of a uniform film thickness formed thereon. [Means to Solve the Problems] A method for pr…
- Who is the assignee on this patent?
- Yamauchi Kunio, Iwaya Isao, Nissin Foods Holdings Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification B32B27/36. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Oct 17 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).