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Production method of polyester film

A technology of polyester film and production method, applied in the field of polyester film manufacturing, can solve the problems of inconvenient electrostatic accumulation and potential safety hazards, and achieve the effects of high glossiness, solving electrostatic problems and high light transmittance

Active Publication Date: 2015-07-08
福建百宏高新材料实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention provides a production method of polyester film for the disadvantages of polyester film winding and slitting, downstream processing, product use, etc.

Method used

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  • Production method of polyester film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A kind of production method of polyester film, its concrete steps are:

[0054] (1) The antistatic bright polyester chips of the upper surface layer, the antistatic bright polyester chips of the lower surface layer and the bright polyester chips of the middle core layer are respectively sent to the three-layer co-extrusion biaxial stretching equipment (ie Three-layer co-extrusion biaxial stretching production line);

[0055] The raw material mass percent of described antistatic bright polyester chip is:

[0056] Antistatic PBT chips 5%

[0057]PEN slices 1%

[0058] Bright polyester chips 94%

[0059] (2) Extrude and melt the antistatic bright polyester chips of the upper and lower surface layers and the bright polyester chips of the middle core layer at 260-280 ° C, and the melt is cooled below 30 ° C to form PET sheets ;

[0060] (3) The cast PET sheet is preheated at 80-100°C for longitudinal stretching and cooled at a temperature below 35°C;

[0061] (4) The P...

Embodiment 2

[0081] A kind of production method of polyester film, its concrete steps are:

[0082] (1) The antistatic bright polyester chips of the upper surface layer, the antistatic bright polyester chips of the lower surface layer and the bright polyester chips of the middle core layer are respectively sent to the three-layer co-extrusion biaxial stretching equipment (ie Three-layer co-extrusion biaxial stretching production line);

[0083] The raw material mass percent of described antistatic bright polyester chip is:

[0084] Antistatic PBT chips 8%

[0085] PEN slices 2%

[0086] Glossy Polyester Chip 90%

[0087] (2) Extrude and melt the antistatic bright polyester chips of the upper and lower surface layers and the bright polyester chips of the middle core layer at 260-280 ° C, and the melt is cooled below 30 ° C to form PET sheets ;

[0088] (3) The cast PET sheet is preheated at 80-100°C for longitudinal stretching and cooled at a temperature below 35°C;

[0089] (4) The P...

Embodiment 3

[0108] A kind of production method of polyester film, its concrete steps are:

[0109] (1) The antistatic bright polyester chips of the upper surface layer, the antistatic bright polyester chips of the lower surface layer and the bright polyester chips of the middle core layer are respectively sent to the three-layer co-extrusion biaxial stretching equipment (ie Three-layer co-extrusion biaxial stretching production line);

[0110] The raw material mass percent of described antistatic bright polyester chip is:

[0111] Antistatic PBT chips 10%

[0112] PEN slices 3%

[0113] Bright polyester chips 87%

[0114] (2) Extrude and melt the antistatic bright polyester chips of the upper and lower surface layers and the bright polyester chips of the middle core layer at 260-280 ° C, and the melt is cooled below 30 ° C to form PET sheets ;

[0115] (3) The cast PET sheet is preheated at 80-100°C for longitudinal stretching and cooled at a temperature below 35°C;

[0116] (4) The...

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Abstract

The invention relates to a production method of a polyester film. The production method comprises the following steps of (1) respectively feeding an antistatic super-bright polyester slice at an upper surface layer, an antistatic super-bright polyester slice at a lower surface layer and a super-bright polyester slice at an intermediate core layer into a three-layer co-extrusion bi-directional stretching device; (2) extruding and melting modified super-bright polyester slices at the upper surface layer and the lower surface layer and the super-bright polyester slice at the intermediate core layer at the temperature of 260 to 280 DEG C to obtain a melt, cooling the melt and casting the cooled melt to generate PET pieces at the temperature of less than 30 DEG C; (3) preheating the cast PET pieces, longitudinally stretching at the temperature of 80 to 100 DEG C, cooling, and setting the cooled PET pieces at the temperature of less than 35 DEG C; (4) then preheating the PET pieces, and transversely stretching at the temperature of 86 to 110 DEG C, setting and crystallizing the set PET pieces at the temperature of 150 to 200 DEG C; and (5) finally removing waste edges of the PET pieces, performing corona treating on the PET pieces, detecting the thickness of each PET piece, and coiling the PET pieces to form the antistatic polyester film with the thickness of 23 to 75 micrometers. Nano zinc oxide is chemically grafted into a PBT (polybutylece terephthalate) material, so that the antistatic effect of a product can be improved.

Description

technical field [0001] The invention relates to polyester film manufacturing technology, which relates to an antistatic polyester film production method. Background technique [0002] Biaxially oriented polyester film BOPET film is used as the outer material of the retort packaging bag. The commonly used thickness is 12 μm. [0003] BOPET film has the following advantages: [0004] ① Good mechanical properties, good rigidity and high strength. [0005] ②Excellent cold resistance and heat resistance. The adaptable temperature range is -70~150℃. [0006] ③Good water resistance, gas resistance and fragrance retention. [0007] ④It has good antistatic properties, is easy to carry out vacuum aluminum plating, and can be coated with PVDC, thereby improving its heat sealability, barrier properties and printing adhesion; [0008] ⑤ Resistant to grease and most solvents, weak acid and alkaline liquids. [0009] The disadvantage of BOPET film is poor puncture resistance. Due to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D7/01
Inventor 彭齐飞
Owner 福建百宏高新材料实业有限公司
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