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High-barrier-property BOPET (biaxially-oriented polyethylene terephthalate) packaging film and production method thereof

A packaging film and high-barrier technology, applied in the high-barrier BOPET packaging film and its production field, can solve the problems of low barrier properties of ordinary PET packaging films, achieve excellent heat-sealing performance and mechanical properties, easy to industrialize production, improve The effect of barrier properties

Active Publication Date: 2013-11-27
GUANGDONG XINRUI NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a high-barrier BOPET packaging film for the low barrier properties of ordinary PET packaging films. This high-barrier BOPET packaging film can greatly improve the barrier performance of the packaging film and has excellent thermal Sealing performance and mechanical properties, and safe and non-toxic

Method used

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  • High-barrier-property BOPET (biaxially-oriented polyethylene terephthalate) packaging film and production method thereof
  • High-barrier-property BOPET (biaxially-oriented polyethylene terephthalate) packaging film and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] PET slices, PETN slices, and MMT modified PET slices are dried by a blower dryer, respectively, and then extruded by three corresponding twin-screw extruders through a five-layer co-extrusion die, and then sequentially passed through casting, Longitudinal stretching, transverse stretching, traction winding, slitting to produce high barrier BOPET packaging film.

[0019] Such as figure 1 As shown, the high-barrier BOPET packaging film made above includes two layers of PET polyester layers, two layers of PETN polyester layers, one layer of MMT modified PET polyester core layer, and the first PET polyester layer from top to bottom. Ester layer 1, first PETN polyester layer 2, MMT modified PET polyester core layer 3, second PETN polyester layer 4, second PET polyester layer 5.

[0020] The PET chips are selected from PET chips with a melting point of 200° C. and a viscosity of 0.65 dl / g (Sinopec Shanghai Petrochemical Co., Ltd.).

[0021] The PETN chip is a PEN chip w...

Embodiment 2

[0025] The difference between this example and Example 1 is that: the PET chips with a melting point of 180° C. and a viscosity of 0.65 dl / g (Sinopec Shanghai Petrochemical Co., Ltd.) are selected.

[0026] The PETN chips are made of PEN chips with a mass content of 20% (Dongguan Qiyuan Plastic Raw Material Co., Ltd.), PET chips with a mass content of 80% and a melting point of 180°C and a viscosity of 0.65dl / g (Sinopec Shanghai Petroleum Co., Ltd. Chemical Co., Ltd.).

[0027] The mass content of MMT (Zhejiang Fenghong Clay Chemical Co., Ltd. DK0) in the MMT blend-modified PET chips is 0.3%, and the mass percentage content of PET is 99.7%.

[0028] The drying temperature of the PET chips is 120°C, the drying temperature of the PETN chips is 150°C, the drying temperature of the MMT blended modified PET chips is 140°C, and the drying time is 4 hours. The temperature of the extruder 1 is 260°C, and the temperature of the extruder 2 The temperature of extruder 3 is 275°C...

Embodiment 3

[0030] The difference between this example and Example 1 is that the PET chips (Sinopec Shanghai Petrochemical Co., Ltd.) with a melting point of 210° C. and a viscosity of 0.70 dl / g are selected for the PET chips.

[0031] The PETN chips are made of PEN chips with a mass content of 20% (Dongguan Qiyuan Plastic Raw Material Co., Ltd.), PET chips with a mass content of 80% and a melting point of 210°C and a viscosity of 0.70dl / g (Sinopec Shanghai Petroleum Co., Ltd. Chemical Co., Ltd.).

[0032] The mass content of MMT (Zhejiang Fenghong Clay Chemical Co., Ltd. DK0) in the MMT blended modified PET polyester layer is 1%, and the mass percentage content of PET is 99%.

[0033] The drying temperature of the PET chips is 120°C, the drying temperature of the PETN chips is 130°C, the drying temperature of the MMT blended modified PET chips is 130°C, and the drying time is 4 hours. The temperature of the extruder 1 is 240°C, and the temperature of the extruder 2 The temperatur...

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Abstract

The high-barrier-property BOPET packaging film is characterized by comprising two PET polyester layers, two PETN (pentaerythritol tetranitrate) polyester layers and an MMT (methylcyclopentadienyl manganese tricarbonyl) modified PET polyester sandwich layer. The high-barrier-property BOPET packaging film is sequentially composed of a PET polyester layer, a PETN polyester layer, an MMT modified PET polyester sandwich layer, a PETN polyester layer and a PET polyester layer from top to bottom. The production method of the high-barrier-property BOPET packaging film is characterized by comprising the following steps: respectively drying PET slices, PETN slices and an MMT modified PET slice by an blast dryer, and extruding through a five-layer coextrusion die head respectively by using three corresponding double screw extruders; carrying out piece casting, longitudinal stretching, lateral stretching, traction rolling and cutting to obtain the high-barrier-property BOPET packaging film. Compared with the prior art, the invention can greatly enhance the barrier property of the packaging film, has the advantages of excellent heat sealability, excellent mechanical properties, high safety, no toxic or harm and low cost, can easily implement industrial production, and can be widely used in the field of packaging of oxygen / water-sensitive foods and drugs.

Description

technical field [0001] The invention relates to a packaging film and a production method thereof, in particular to a high-barrier BOPET packaging film and a production method thereof. Background technique [0002] PET has become a widely used packaging material due to its advantages such as convenient molding and processing, excellent comprehensive mechanical properties, and low price. Although PET itself has high barrier properties to water, oxygen, carbon dioxide and other gases, for some occasions that have special requirements for barrier properties, such as tomato products, cooked foods sensitive to trace oxygen, etc., only PET is used as packaging. The material cannot meet the requirements. [0003] PEN is a new type of heat-shrinkable polyester developed in recent years. It not only has all the excellent properties of PET, but also has the characteristics of good barrier property and high mechanical properties. It can be said that it is an ideal material in term...

Claims

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Application Information

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IPC IPC(8): B32B27/06B32B27/36B32B37/00B65D65/40
Inventor 谢庆坚
Owner GUANGDONG XINRUI NEW MATERIAL TECH
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