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Label films for deep drawing methods

A film and deep-drawing technology, applied in labels, chemical instruments and methods, applications, etc., can solve the problems of expensive films and achieve excellent adhesion and excellent gloss

Active Publication Date: 2011-12-14
伊诺维亚薄膜美国公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Films according to US 6,764760 only work for deep drawing applications with the proposed embossing which also makes the film more expensive as an additional process

Method used

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  • Label films for deep drawing methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] According to the coextrusion method, five layer preformed films were coextruded through a wide slot die. The preformed film is drawn off on chill rolls, solidified, then oriented in the machine and transverse directions, and finally set. Surface tension is increased by corona pretreatment of the surface of the outer cover. The five-layer film has the following layer structure: outer cover layer / outer middle layer / base layer / inner middle layer / inner cover layer. The composition of the individual layers of the film is as follows:

[0119] External cover layer (1.0μm):

[0120] 100 wt% ethylene-propylene copolymer with an ethylene proportion (relative to the copolymer) of 4 wt% and a melting point of 135 °C; and a melt flow index of 7.3 g / 10 min at 230 °C and a load of 2.16 kg (DIN 53 735)

[0121] External middle layer (4μm):

[0122] 100 wt% propylene homopolymer (PP) with 4.5 wt% n-heptane soluble fraction (relative to 100% PP), melting point of 165°C; 3.2 g at 230°...

Embodiment 2

[0144] Films were fabricated as described in Example 1. Unlike Example 1, the inner cover layer comprises 70 wt% of the propylene-butene copolymer of Example 1 and 30 wt% of a density of 0.931 g / cm 3 and polyethylene (MDPE) with a melt flow index (190° C. and 50 N) of 0.8 g / 10 min. The rest of the composition and the process conditions in the thin film fabrication were not changed.

Embodiment 3

[0146] Films were fabricated as described in Example 2. In contrast to example 2, the inner covering layer comprises 70 wt. % of a melt with an ethylene proportion of 4 wt. Ethylene-propylene copolymer with a flow index of 7.3 g / 10 min and 30 wt% of the same polyethylene. The rest of the composition and the process conditions in the thin film fabrication were not changed.

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Abstract

The present invention relates to the use of a multilayer biaxially oriented polyolefin film comprising at least five layers as a label in deep drawing, the film consisting of the following layers: I base layer without voids and IIa outer intermediate layer free of voids and comprising at least 95% by weight of a propylene polymer having a propylene content of 98 to 100% by weight relative to the propylene polymer, and IIIa the outer cover layer is printable, and IIb the inner intermediate layer consists essentially of a propylene polymer, and It contains cavities, and IIIb inner covering layer is applied on the surface of the inner intermediate layer and is a sealable covering layer and has a sealing initiation temperature of <130°C.

Description

technical field [0001] The present invention relates to the use of biaxially oriented polypropylene films as in-mold labels in deep drawing. Background technique [0002] The term "label film" covers a wide and technically complex field. A distinction is made between various labeling technologies, which are fundamentally different in terms of process conditions and necessarily place different technical requirements on the labeling material. Common to all labeling processes is that an aesthetically attractive labeled container must be obtained as the end result, wherein good adhesion to the labeled container must be ensured. [0003] Many different techniques for applying labels are used in the labeling process. Distinguish between self-adhesive labels, wrap-around labels, shrink labels, in-mold labels, patch labels, etc. In all these various labeling methods it is possible to use films made of thermoplastics as labels. [0004] In in-mould labeling also a distinction is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C51/16B29C55/02B32B27/06B32B27/18B32B27/32G09F3/04
CPCB29C49/24B29C51/10B29K2423/065B29C49/04B29L2031/744B29C55/023B29K2023/06B29C2049/2412B29C55/143B29C2791/006B29K2023/12B29K2023/0625B29C2791/007B29K2023/083B29K2023/065B29C51/16B32B27/32B29K2023/0633B29K2023/0641B32B7/12B32B27/08B32B27/16B32B27/18B32B2264/0264B32B2264/0278B32B2264/102B32B2264/104B32B2307/21B32B2307/31B32B2307/406B32B2307/41B32B2307/414B32B2307/518B32B2307/72B32B2307/746B32B2307/75B32B2439/00B32B2519/00Y10T428/24802Y10T428/249983B29C2049/7831
Inventor W·图斯Y·杜普雷
Owner 伊诺维亚薄膜美国公司