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Low-shrinkage polyester shrink film and preparation method thereof

A low-shrinkage, shrinkable film technology, applied in chemical instruments and methods, flat products, and other household appliances, can solve the problems of different influences and packaging effects, and achieve the effect that is conducive to industrial production

Active Publication Date: 2021-08-31
SHANDONG SHENGHE PLASTIC DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different materials have different shrinkage forces, so different shrinkage forces have different effects, which in turn affect the packaging effect
The maximum shrinkage force of the polyester heat shrinkable film can reach 5-7N. In the actual use process, it has no effect on thicker bottles, but for thinner bottles, the bottle will be squeezed and deformed due to too much shrinkage force.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Raw material formula: This low-shrinkage polyester shrink film consists of one layer. The polyester shrink film raw material slices contain diacid components, which include: calculated by mole fraction, terephthalic acid accounts for 90%, and the modified component adipic acid Acid accounts for 10%; and glycol components include: calculated by mole fraction, ethylene glycol accounts for 68%, modified component neopentyl glycol accounts for 22%, and diethylene glycol accounts for 10%. Also added with opening smooth agent silicon dioxide, accounts for 2% of total mass.

[0039] Preparation method: The melt extruded from the extruder passes through the filter metering pump and enters the single-layer die to extrude the sheet-like outflow layer with a single-layer structure, and then cools the sheet-like outflow layer on a casting roll at 32°C to form unstretched sheet;

[0040] After preheating the unstretched sheet at 30°C higher than the softening point, stretch the str...

Embodiment 2

[0043]Raw material formula: This low-shrinkage polyester shrink film has three layers, and the thickness ratio of the three layers is 1:8:1. The raw material slices of the polyester shrink film contain diacid components, which include: calculated by mole fraction, terephthalate Formic acid accounts for 92%, modified component adipic acid accounts for 8%; and glycol components, which include: calculated by mole fraction, ethylene glycol accounts for 72%, modified component 1,4-cyclohexane di Methanol accounts for 12%, and ethylene glycol accounts for 16%. Wherein two surface layers add opening smooth agent silicon dioxide, account for 0.5% of total mass.

[0044] Preparation method: The melts extruded from each extruder pass through their respective filter metering pumps and enter the multi-layer die to extrude a sheet-like outflow layer with a multi-layer structure, and then cast the sheet-like outflow layer at 27°C Cooling on the roll to form an unstretched sheet;

[0045] ...

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Abstract

The invention belongs to the technical field of heat shrink films, and particularly relates to a low-shrinkage polyester shrink film and a preparation method thereof. The low-shrinkage polyester shrink film contains diacid components and diol components, and the diacid components comprise 50-95% of terephthalic acid, 5-20% of modified component adipic acid and 0-30% of other diacids according to the total mole of the diacid components. The maximum shrinkage force of the low-shrinkage polyester shrink film is less than or equal to 3N, the shrinkage force curve at various temperatures is slowly improved, and the low-shrinkage polyester shrink film is suitable for use requirements of bottles with various thicknesses and meets the development requirements of green products. According to the low-shrinkage polyester shrink film, the shrinkage force can be greatly reduced in various shrinkage rate ranges. The preparation method of the low-shrinkage polyester shrink film is simple and easy to implement and beneficial to industrial production.

Description

technical field [0001] The invention belongs to the technical field of heat shrinkable films, and in particular relates to a polyester shrinkable film with low shrinkage force and a preparation method thereof. Background technique [0002] There are two types of heat shrink film labels: heat shrink sleeve labels and heat shrink wrap labels. Shrink sleeve labeling is a commonly used technology. Heat-shrinkable film is widely used because of its ability to shrink when heated at a predetermined temperature, such as: labeling bottles, packaging batteries, packaging containers and other products. [0003] Polyester heat-shrinkable film is a new type of functional film material. It uses high-quality heat-shrinkable polyester chips (PETG) as the main raw material. It adopts advanced automatic production lines and unique process formulas. After drying, melting, extrusion, Cast and stretched into film. In order to prepare a polyester film with a high heat shrinkage rate, it is nece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L67/02C08K3/36B32B27/36B32B27/06B32B27/18B29D7/01
CPCC08J5/18B32B27/36B32B27/08B32B27/18B29D7/01C08J2367/02C08K3/36
Inventor 贺海峰冯益强王凯
Owner SHANDONG SHENGHE PLASTIC DEV
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