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Multilayered Sheet

一种片材、粘附层的技术，应用在可热成形和热稳定的多层片材领域，能够解决片材难热成形、结晶性限制等问题

Active Publication Date: 2018-02-16
BEMIS COMPANY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sheets with two polypropylene outer layers are expected to be difficult to thermoform
In addition, it is expected that the method of making a sheet with two polypropylene layers will be limited due to the crystallinity and other characteristics of polypropylene

Method used

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  • Multilayered Sheet
  • Multilayered Sheet
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] As used throughout this application, the term "sheet" refers to a plastic web having a thickness equal to or greater than about 10 mils (about 254 microns). The term "film" refers to a plastic web having a thickness of less than about 10 mils (about 254 microns).

[0018] As used throughout this application, the term "about" means approximately, rounded up or down, reasonably close to or in the vicinity of, and the like. The term "approximately" is synonymous with the term "about". Unless the context clearly requires, every quantitative property cited or referenced in this application (e.g., temperature, melting temperature, glass transition temperature, storage modulus, etc.) is qualified by "about," whether or not "about" appears before quantifying properties.

[0019] As used throughout this application, the term "thermoplastic" refers to a polymer or polymer mixture that softens when exposed to heat and then returns to its original state when cooled to room temper...

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PUM

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Abstract

A multilayered sheet is described. The sheet comprises a first layer comprising a polyolefin having a melting temperature, a storage modulus (G) greater than 100,000 psi (690 MPa) at ambient temperature, and a glass transition temperature less than ambient temperature; and a second layer comprising a polymer having a glass transition temperature greater than ambient temperature.

Description

Background technique [0001] The present application describes multilayer sheets, in particular multilayer sheets that may be thermoformable and heat stable. [0002] Packaging films and sheets are used for many purposes. One of these many purposes includes thermoforming films or sheets into packages, such as trays, trays or other containers, which can then be used to package products. Another of these many purposes includes packaging products that have undergone heat treatments including, but not limited to, retort, aseptic, hot-fill, or microwave treatments. [0003] One packaging sheet currently used for thermoforming into packages is disclosed in US Patent Application Publication No. US2011 / 0104342 (published May 5, 2011). Such a sheet comprises a first rigid component and a second rigid component and has a thickness of less than about 0.115 in in both the machine and cross directions, as measured according to ASTM D1004. * A normalized combination of resistance to tear ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32
CPCB32B7/12B32B27/08B32B27/302B32B27/306B32B27/36B32B2250/02B32B2270/00B32B2307/308B32B2307/702B32B2307/704B32B2307/732B32B2439/00B32B2250/24B32B2307/52B32B2307/5825B32B2307/738B32B2439/02B32B27/32B32B2255/10B32B2255/26B32B2553/00
Inventor K·D·格莱泽A·O·奥杜桑雅
Owner BEMIS COMPANY INC