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Polyester film and methods for making same

A polyester film, amorphous polyester technology, used in the manufacture of polyester film, biaxially stretched multi-layer co-extruded polyester film field, can solve the problem of high bonding fastness, can not be used as tray sealing film, polyester film The film is difficult to heat seal and other problems, to achieve the effect of simple process, wide source of raw materials and reducing environmental pollution

Active Publication Date: 2009-02-18
WEIFANG FUWEI PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional polyester film is difficult to heat seal and cannot be used as a sealing film for the above trays
Although the heat-sealable polyester film manufactured by three-layer co-extrusion can meet this requirement, the bonding fastness between the conventional heat-sealable polyester film and APET and CPET is very high. When taking out, it is difficult to tear the polyester film from the seal, which limits its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] formula:

[0023] heat seal layer

[0024] PETG chips 90wt%,

[0025] EVA slice (VA=10 MI=50) 5wt%,

[0026] Anti-adhesive slice (carrier is EVA, SiO Concentration 6wt%) 5wt%,

[0027] grassroots

[0028] Glossy PET chips 50wt%

[0029] Recycled chips 20wt%

[0030] Additive chip (carrier is PET, SiO2 concentration 0.3wt%) 30wt%

[0031] The thickness of the control film is 15um, and the thickness of the heat-sealing layer is 3.0um.

[0032] Process steps:

[0033] Mix the PETG slices, EVA slices, and anti-adhesive agent slices in the mixing chamber in proportion, and add them to the twin-screw extruder. The temperature of the extruder is set at 150-185°C;

[0034] After pre-crystallization and drying treatment of PET chips, recycled material chips and additive chips, the moisture content is controlled below 50ppm, and they are added to the single-screw extruder, and the temperature of the extruder is set at 260-290°C.

[0035] The melts extruded by the two ext...

Embodiment 2

[0038] formula:

[0039] heat seal layer

[0040] PETG chips 85wt%,

[0041] EVA (VA=14 MI=30) 7wt%,

[0042] Anti-adhesive slice (carrier is EVA, SiO Concentration 6wt%) 8wt%,

[0043] grassroots

[0044] Glossy PET chips 65wt%

[0045] Recycled chips 15wt%

[0046] Additive chip (carrier is PET, SiO Concentration 0.3wt%) 20wt%,

[0047] The thickness of the control film is 25um, and the thickness of the heat-sealing layer is 3.0um.

[0048] Process steps:

[0049] Process steps:

[0050] Mix the PETG slices, EVA slices, and anti-sticking agent slices in the mixing chamber in proportion, and add them to the twin-screw extruder. The temperature of the extruder is set at 150-185°C;

[0051] After pre-crystallization and drying treatment of PET chips, recycled material chips and additive chips, the moisture content is controlled below 50ppm, and they are added to the single-screw extruder, and the temperature of the extruder is set at 260-290°C. The melts extruded by t...

Embodiment 3

[0054] formula:

[0055] heat seal layer

[0056] PETG chips 50wt%,

[0057] EVA (VA=14 MI=30) 33.33wt%,

[0058] Anti-adhesive slice (carrier is EVA, SiO Concentration 6wt%) 16.67wt%,

[0059] grassroots

[0060] Glossy PET chips 75wt%

[0061] Recycled chips 5wt%

[0062]Additive chip (carrier is PET, SiO Concentration 0.3wt%) 20wt%,

[0063] The thickness of the control film is 25um, and the thickness of the heat-sealing layer is 3.0um.

[0064] Process steps:

[0065] Process steps:

[0066] Mix the PETG slices, EVA slices, and anti-adhesive agent slices in the mixing chamber in proportion, and add them to the twin-screw extruder. The temperature of the extruder is set at 150-185°C;

[0067] After pre-crystallization and drying treatment of PET chips, recycled material chips and additive chips, the water content is controlled below 50ppm, and then put into a single-screw extruder, and the temperature of the extruder is set at 260-290°C. The melts extruded by the ...

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PUM

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Abstract

The invention discloses a polyester film. The polyester film at least comprises a first film layer and a second film layer; the first film layer is positioned on a surface layer and is in co-extrusion compounding with the second film layer; the first film layer is a heat-sealing layer which consists of 50 to 90 weight percent of amorphous polyester, 9.7 to 49 weight percent of EVA resin and 0.3 to 1 weight percent of an antisticking agent; the second film layer is a base layer; and main composition of the base layer is crystalline polyester. The invention also discloses a method for manufacturing the polyester film. As the method disclosed by the invention has a simple process and wide source of raw materials, the produced polyester film not only has good heat sealing effect but also is easy to peel off from an APET or CPET tray.

Description

technical field [0001] The invention relates to a polyester film, more specifically, to a biaxially stretched multilayer co-extruded polyester film, and also relates to a method for producing the polyester film. Background technique [0002] Biaxially oriented polyester film has good high temperature resistance and low temperature resistance, and is very suitable for packaging food that requires microwave heating, oven heating or frozen storage. Usually such products are stored in trays made of APET (amorphous polyester) or CPET (crystalline polyester), and the upper end of the tray is sealed with polyester film by heat. [0003] Conventional polyester film is difficult to heat seal and cannot be used as a sealing film for the above-mentioned trays. Although the heat-sealable polyester film manufactured by three-layer co-extrusion can meet this requirement, the bonding fastness between the conventional heat-sealable polyester film and APET and CPET is very high. When takin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36B65D65/40B29C69/00B29C47/06B29C55/14B29C71/02B29K67/00
Inventor 孙文训郭申靳钊张雷刘现峰刘志强滕岩
Owner WEIFANG FUWEI PLASTIC
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