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Polyamide film and preparation method thereof

A polyamide film, polyamide technology, applied in chemical instruments and methods, flexible covers, packaging, etc., can solve problems such as poor yield and film wrinkles

Inactive Publication Date: 2011-09-21
XIAMEN CHANGTIAN ENTERPRISE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even if the average value of physical properties such as shrinkage in boiling water and refractive index of the film wound into a film roll can meet the requirements, when the variation of a film roll is large, it is easy to cause lamination during the bag making process. Problems such as wrinkling between films and poor yield

Method used

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  • Polyamide film and preparation method thereof
  • Polyamide film and preparation method thereof
  • Polyamide film and preparation method thereof

Examples

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preparation example Construction

[0032] Film preparation

[0033] The preparation process of the heat-resistant cooking polyamide film of the present invention is specifically as follows:

[0034] The dried raw resin is melted and extruded through three independent single-screw extruders at a temperature of 240~260℃. The melt flows through a filter, a metering pump, a static mixer, and a coat hanger die to reach 20~20. Molding on the cooling drum at 40℃, it can be well attached to the cold drum under the action of the electrostatic attaching device, which can minimize the generation of crystals, avoid the generation of large-sized crystal nuclei, and make a good thickness Sheet. The sheet is stretched in the longitudinal direction (length direction) at a temperature of 45 to 75°C, and the longitudinal stretching ratio is 2.0 to 3.5. After stretching, the film is cooled at a temperature of about 30°C, and then it is stretched in the transverse direction (width direction). Width machine. After passing through a ...

Embodiment 1

[0052] By using the co-extrusion method, the polyamide-based mixed resin formula of Example 1 shown in Table 1 was mixed and proportioned, the mixed nylon 6 resin was dried, put into the corresponding hopper and sent to the corresponding extruder, and heated to It is melted in the barrel at 265°C and extruded in a sheet form from the T-die. Using a high-voltage electrostatic film attachment device, it was attached to a cold drum with a surface temperature of 24°C and quenched to obtain an unstretched thick film. Then, the extruded thick sheet is heated through a series of high-precision metal rollers, and under a certain speed gradient, the sheet is elongated longitudinally, so that the polymer molecules are longitudinally oriented, shaped and cooled. The stretching in this process is carried out in two times, the stretching ratio used in both times is the same, which is 1.70 times, and the stretching temperature is 58°C and 62°C, respectively. Then, this MD stretched film was...

Embodiment 2

[0055] Except that the B / A ratio of the core layer material was changed to 90 / 10, the other process conditions were the same as those in Example 1, to obtain a biaxially oriented polyamide film.

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Abstract

The invention discloses a polyamide film which comprises a first surface layer, a core layer and a second surface layer, wherein the first surface layer and the second surface layer contain fatty polyamide. The polyamide film is characterized in that the core layer contains 10-20 percent by weight of amorphous semi-aromatic polyamide and 80-90 percent by weight of fatty polyamide. The polyamide film can be cooked at high temperature of 121 DEG C or even 135 DEG C and no S-shaped warping or delamination is generated after the cooking. The polyamide film can be widely applied to food package, in particular to the field of high-temperature resistant cooked food package. The invention further discloses a method for preparing a polyamide film which is resistant to high-temperature cooking.

Description

Technical field [0001] The invention belongs to the field of flexible packaging industry, and relates to a polyamide film and a manufacturing method thereof, and more specifically to a high-temperature cooking-resistant polyamide film and a manufacturing method thereof. The polyamide film is compatible with polyolefins such as polyethylene and polypropylene. After the resin film is used for composite bag making, it has good high-temperature cooking resistance and processing performance when it is used for packaging such as boiling and cooking food. Background technique [0002] The biaxially oriented polyamide film with nylon 6 as the main component is relatively strong and has excellent properties such as gas barrier, pinhole resistance, transparency, impact resistance, and printability, so it is widely used in various liquid foods. , Water-containing food, frozen food, livestock meat, paste food, aquatic food, steamed food and other types of food or other precision equipment pa...

Claims

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Application Information

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IPC IPC(8): B65D65/40B32B27/34B32B27/18B29C69/00B29C55/14B29C71/02
Inventor 杨清金
Owner XIAMEN CHANGTIAN ENTERPRISE
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