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Collation shrink

A heat-shrinkable film and film technology, which is applied in the direction of synthetic resin layered products, transportation and packaging, packaging, etc., can solve the problems of reducing the optical properties of the finishing shrink film

Inactive Publication Date: 2005-04-27
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In turn, these additives reduce the optical properties required for finishing shrink films

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0067] In the following examples, three-layer A / B / A films of the invention and comparative films were produced in a commercially available extruder from Winmoller & Holscher. The coextruded structure was a symmetrical structure with a 30 micron thick core and two skin layers each 5 micron thick. The machine conditions are as follows: (a) Die diameter: 250mm; (b) Die gap: 1.4mm; (c) Blow molding ratio: 3.0; (d) Die adapter temperature of core extruder: 200°C; ( e) Die adapter temperature setting of the surface layer extruder: 190°C; (f) Die head temperature: 200°C.

[0068] Table 1 lists the various products used in the examples in Table 2.

[0069] product

density

MI 3

note

1 HYA800

0.961

0.7

HDPE gas phase

1 HDZ222

0.964

2.4

Bimodal HDPE

1 LL1201XV

0.9255

0.7

Ziegler Natta LLDPE C 4 gas phase

1 Exceed 1327CA

0.927

1.3

Metallocene LLDPE C 6 gas phase

...

Embodiment 23

[0083] In Commercial Maachi TM Films having an A / B / A structure of 2 mil thickness and a thickness ratio of 15:70:15 respectively were produced on the coextrusion line. Layer A consisted of about 95 wt% Exceed 1327CA and about 5 wt% LD514. Layer B consisted of about 80 wt% LD514BA and about 20 wt% HDZ222.

Embodiment 24

[0085] The same film as in Example 23 was produced in the same manner except that HDZ222 was used instead of LD514.

[0086] A comparison of Examples 23 and 24 illustrates that the combination of mLLDPE and LDPE as the skin layer in this particular case resulted in a COF drop of about 15%, a modest increase in gloss and a decrease in haze from 10.4 in Example 24 to 5.9 in Example 23.

[0087] The invention has been described above with reference to a number of embodiments and specific examples. In view of the above detailed description, those skilled in the art can get many hints to make changes to the scheme. All such obvious modifications are intended to be within the full scope of the appended claims.

[0088] A preferred embodiment is a multilayer film structure having at least one first layer comprising HDPE and at least one second layer different from said first layer, said second layer comprising metallocene polyethylene; ordinary skill in the art Persons armed with t...

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Abstract

The invention relates to a film structure combining a metallocene-rich layer and an HDPE-containing layer. A preferred embodiment is a structure having metallocene-rich skin layers and an HDPE-containing core. The structures of the invention are particularly useful for collation shrink.

Description

field of invention [0001] The present invention relates to coextruded structures for collation shrink films and polyethylene blends therefor. Background of the invention [0002] Collation shrinking involves binding objects together using heat shrinkable film. Collation shrink is used in a very wide variety of applications, and in particular for secondary packaging of food or beverages. Examples include metal cans and plastic bottles. [0003] Typically, the film is applied at room temperature and placed under a heat source to shrink it. Suitable performance characteristics on a shrink wrap line include sufficient stiffness to allow the film to wrap properly around the object being packaged; sufficient dimensional shrinkage to ensure a tight fit; and sufficiently low coefficient of friction (COF) for cutting Processing and packaging handling. Films suitable for use as finishing shrink must have high heat shrinkage to ensure a tight fit; and high tensile strength to withs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/32B65D65/40C08J5/18C08L23/06
Inventor M·P·拉维尔D·S·戴维斯
Owner EXXONMOBIL CHEM PAT INC
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