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Technique for preparing biaxial tension polyamide thin film

A technology of polyamide film and process method, applied in the field of plastic product processing technology, can solve the problems of unclear language, product type and performance limitation, complicated process and the like

Inactive Publication Date: 2005-08-17
FSPG HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is said that this method can obtain a polyamide film whose shrinkage rate and refractive index in certain angular directions meet its requirements. However, the control of the stretching process parameters in the longitudinal and transverse directions of the process is unclear, the control means are not specific, and the process It is also more complicated, and the product type and performance are also limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022]After drying nylon 6 resin (relative viscosity: 2.8, Tg: 41°C, Tcc: 71°C), add it to the kneading extruder together with antistatic agent and other additives, and melt it at 250°C±10°C. The T-shaped die is extruded into a hot film, which flows down to the casting roller rotating at a linear speed of 110-160m / min. Circulating cooling water is passed through the rotating casting roller to control the average temperature of the surface of the roller at 25°C, and a DC high voltage is applied to the surface of the casting roller, and the dense static electricity on the casting roller attracts the hot film tightly. Closely attached to the surface of the casting roll and bypassing the wrap angle close to 180°, the hot film is rapidly and fully cooled and solidified into an unoriented thick sheet with a thickness of 145 μm. The thick sheet is introduced into the longitudinal tenter; on the longitudinal tenter, the longitudinal stretching rollers are controlled to have different ...

Embodiment 2

[0029] The operation process is the same as in Example 1, except that: the average temperature of the surface of the casting roller is controlled to be constant at 16° C., the average temperature of the longitudinal preheating roller is controlled to be constant at 45° C., and the average temperature of the surface of the longitudinal stretching roller is controlled to be constant at At 45°C, the slab is stretched longitudinally by 2.5 times at an average stretching temperature of 45°C. The average temperature in the preheating zone of the stretching oven is controlled to be 50°C, and the average temperature in the stretching zone of the stretching oven is controlled to be 80°C, and the nylon resin film is stretched to 3.0 times transversely. The average temperature of the heat-setting oven is controlled at 205°C, and the film is heat-set and 5% transversely relaxed in the heat-setting oven.

Embodiment 3

[0031] The operation process is the same as in Example 1, except that: the average temperature of the surface of the casting roll is controlled to be constant at 30°C, the average temperature of the longitudinal preheating roll is controlled to be constant at 65°C, and the average temperature of the surface of the longitudinal stretching roll is controlled to be constant at At 65°C, the slab is stretched longitudinally by 3.5 times at an average stretching temperature of 65°C. The average temperature in the preheating zone of the stretching oven is controlled at 90° C., and the average temperature in the stretching zone of the stretching oven is controlled at 120° C., and the nylon resin film is stretched to 3.5 times transversely. The average temperature of the heat-setting oven is controlled at 190°C, and the film is heat-set and 6% transversely relaxed in the heat-setting oven.

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Abstract

The technological process of preparing biaxial stretching polyamide film with proper stretching rate includes the step of casting polyamide film and cooling the polyamide film from the mold to temperature of 5-40 deg.c; the longitudinal stretching step at 35-75 deg.c; horizontal stretching step at 40-130 deg.c; and thermal fixing step at 180-230 deg.c. The technological process of the present invention has simple, flexible and precise operation, and can produce biaxial stretching polyamide film of different types and with different performances.

Description

【Technical field】 [0001] The invention relates to the field of plastic product processing technology, more specifically, the invention relates to a method for producing polyamide film. 【Background technique】 [0002] Common name of polyamide series resin: Nylon, nylon film produced by using various nylon raw materials through biaxial stretching process is commonly known as BOPA. Biaxially stretched nylon film has various excellent physical and chemical properties that many other films do not have, such as: high gas barrier and good oil barrier performance, which can block various gases, including oxidizing gases such as oxygen, from penetrating into the film and The unique smell of the items contained in the packaging bag seeps out of the film, thereby preventing the contents of the packaging bag from being oxidized and deteriorated or changing taste, and preventing the oil in the packaging bag from seeping out to pollute other items and the environment. The shelf life of fo...

Claims

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Application Information

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IPC IPC(8): B29C55/14
Inventor 吴耀根蔡朝晖周军张航伍杰锋邝志强黄尧明
Owner FSPG HI TECH
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