Multilayer barrier film

A technology of barrier film and core layer, applied in the direction of layered products, synthetic resin layered products, containers with multiple items, etc., can solve the problems of low mechanical properties, tear strength and impact strength, sealing properties, etc.

Inactive Publication Date: 2010-10-20
NOVA CHEM (INT) SA
View PDF8 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical properties (such as tear strength and impact strength) and sealing properties of HDPE films are low, so multilayer films are widely used

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Embodiment 1——Comparative example

[0086] Films were produced on a three-layer coextrusion film line manufactured by Brampton Engineering. A three-layer film was prepared with a total thickness of 2 mils using a blow-up ratio (BUR) of 2 / 1. A three-layer film was prepared with a total thickness of 1 mil using a BUR of 1.5 / 1.

[0087] The "sealant" layer (ie one of the skin layers indicated as layer C in Tables 2.1 and 2.2) was prepared from a conventional high pressure low density polyethylene homopolymer having a melt index of about 2 g / 10 min. Such low density homopolymers are commercially available widely and typically have a density of about 0.915 to 0.930 g / cc. This resin is indicated in the table as "Sealant LD". In all examples, the amount of the sealant layer was 15 wt%.

[0088] The core layer (Layer B in Tables 2.1 and 2.2) is a conventional high density polyethylene homopolymer (NOVA Chemicals under the trademark 19G), referred to in these examples as...

Embodiment 2

[0102] Embodiment 2 - the present invention

[0103] 1 mil and 2 mil films were prepared in the same manner as described in Example 1.

[0104] The core layers of all films were prepared with a combination of "HDPE Blend" and Nucleating Agent 1 (1000 parts per million by weight).

[0105] The sealant layers of all films were prepared with 15% by weight of the LD sealant resin used in Example 1.

[0106] Another skin layer was prepared using the same resin as used in Example 1, the contents of which are shown in Tables 3.1 and 3.2.

[0107] chart 3.1

[0108] 1 mil film of the present invention

[0109]

[0110]

[0111] Table 3.2

[0112] 2 mil film of the present invention

[0113]

[0114]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
melt flow indexaaaaaaaaaa
melt flow indexaaaaaaaaaa
melt flow indexaaaaaaaaaa
Login to view more

Abstract

Multilayer ''barrier'' films which have excellent Water Vapor Transmission Rate (WVTR) performance are prepared using a core layer which comprises a blend of two different high density polyethylenes (HDPEs) and a nucleating agent. The films are suitable for the preparation of packages for dry foods such as crackers and breakfast cereals.

Description

technical field [0001] The present invention relates to multilayer plastic films having high barrier properties. The film is particularly suitable for packaging dry foods such as crackers and breakfast cereals. Background technique [0002] Plastic films having gas barrier properties are widely used in the packaging of dry foods. The film should have a low water vapor transmission rate (WVTR) and low oxygen transmission rate (OTR). Fragrance blocking is also desirable. [0003] The paper packaging originally used for these applications was partially replaced by cellophane, which is expensive and difficult to handle. [0004] Barrier films made from high-density polyethylene (HDPE) offer an alternative to paper or cellophane. HDPE membranes offer a good balance between cost and performance. However, when additional barrier and / or toughness is required, it is known to produce barrier resins made of more expensive barrier resins such as ethylene-vinyl alcohol (EVOH), polya...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B65D71/06B65D75/14
CPCB32B27/18B32B27/32C08L23/06C08L2205/02B32B27/30B32B27/34B32B2250/05B32B2307/7244B32B2439/80Y10T428/31913Y10T428/31757Y10T428/31855C08L2666/06
Inventor N·D·J·奥比P·拉姆
Owner NOVA CHEM (INT) SA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap