How to choose printing shrink film?

2023-04-10 10:11:55 Zhejiang Zhongcheng Packing Material Co., Ltd Viewd 341

What is printed shrink film?

It is a packaging material that is capable of having an image or text printed on the film and shrinking to fit the packaged item when heat is applied. This film is usually made from materials such as polyvinyl chloride, polypropylene and modified polyester.

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Can printing be done on shrink film?

Shrink films can be printed by certain printing methods, such as flexographic or digital printing. The design is printed on a special film, which is then wrapped around the product and heated to shrink to fit the shape of the product. This process is commonly used to label bottles or other packaged products, and is widely utilized on a variety of packaging.

Understanding the Types and Functions of Printed Shrink Film

Printed shrink film refers to plastic film that has been printed and processed at the time of manufacture and has excellent stretching and shrinking properties, capable of shrinking to half of its original volume when heated to facilitate the packaging of products and ensure the safety and aesthetics of the packaged goods. It is commonly used in the fields of food, medical equipment, daily chemical products, etc.

Commonly used types of printed shrink film are:

  1. PVC shrink film: transparent, soft and tough, but toxic gases are produced during manufacturing;

  2. PETG shrink film: transparent, high heat resistance, suitable for high speed packaging;

  3. POF shrink film: high transparency, soft, environmental protection, but poor stretching performance, not suitable for high-speed packaging.

ParameterPVC Shrink FilmPETG Shrink FilmPOF Shrink Film
MaterialPolyvinyl Chloride (PVC)Polyester modified withPolyethylene (PE)
Polyethylene Glycol (PETG)

Shrinkage Rate40%-50%About 70%60%-75%
EnvironmentalContains chlorine, notRecyclable, moreEnvironmentally friendly,
Friendlinessenvironmentally friendlyenvironmentally friendlyrecyclable
TransparencyLower transparencyHigher transparencyHigh transparency
PrintingMore difficult to printEasier to printEasy to print

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Considerations for choosing printing shrink film

Choosing the right printing shrink film requires comprehensive consideration of several factors. First, it is necessary to consider the properties and requirements of the packaged product, including shape, size, weight, and shelf life. Secondly, production equipment and processes are also important considerations in choosing printed shrink film. Different production equipment and processes require different types of printed shrink film to ensure production efficiency and product quality. In addition, production environment and safety requirements also need to be taken into consideration when choosing printed shrink film. In special production environments (e.g. high temperature, low temperature, humidity, etc.), printing shrink film with the appropriate high performance film needs to be selected. Finally, the material type and thickness should be selected based on the required printing effect and cost factors. To sum up, choosing the right printing shrink film requires consideration of various factors to ensure the final product quality and production benefits.

  1. product attributes and requirements: suitable shrink film types and specifications should be selected based on the product characteristics and requirements, such as product shape, weight, shelf life, etc;

  2. production equipment and process flow: the shrinkage conditions, temperature, time, etc. required in production should be considered to select the appropriate type of shrink film to avoid production problems;

  3. production environment and safety requirements: shrink film that meets the standards should be selected according to the production environment and safety requirements to guarantee the safety and environmental protection of the production process.

How to effectively assess the performance of printed shrink film

Evaluating the performance of printed shrink film requires consideration of several factors. The first is the physical and chemical properties of the material, including shrinkage, transparency, strength, and other indicators. The second is the evaluation of printing performance and printing effect, which should examine factors such as surface tension, surface flatness, surface gloss, and printing accuracy. In addition, its processing performance needs to be evaluated during the production process, including the heating shrinkage temperature range, shrinkage strength, and heat resistance performance. Finally, it is necessary to consider the evaluation of its environmental performance and safety performance, such as whether it contains harmful substances, whether it meets the relevant certification requirements, etc.

  1. assessment methods and standards for shrinkage performance: the shrinkage rate of the film is tested by simulating a heated shrinkage environment to confirm whether the shrinkage performance of the film meets the requirements, which is assessed according to the international standard ASTM D2732;

  2. assessment methods and criteria for tensile properties: testing the tensile strength and elastic modulus of the film by means of a tensile testing machine, evaluated according to the international standard ASTM D882;

  3. evaluation methods and criteria for printing performance: testing the printing quality, color difference, etc. of the film by standard printing process, and evaluating according to international standard ASTM D638.

Application case studies of printed shrink film

  1. Food packaging industry: Printed shrink film is commonly used in the packaging of various food products, such as candy, cookies, beef jerky, etc. The excellent shrinkage performance allows the packaging to closely fit the food, effectively preventing contamination and maintaining the freshness of the food.

  2. Medical device industry: printed shrink film is widely used in the packaging of various medical devices, such as infusion pof shrink wrap bags, reagent kits, etc. Its high heat resistance and shrinkage performance ensure its application in high-temperature sterilization and packaging tightness.

  3. Daily chemical industry: printed shrink film is commonly used for packaging various daily chemical products, such as laundry detergent, shampoo, etc. Shrink film with high transparency and good printing effect improves the beauty and sense of the quality of the products.

FAQ (Frequently Asked Questions)

  1. How to store and use printed shrink film correctly?

    Shrink film should be stored in a dry and ventilated warehouse, avoiding direct sunlight and a high-temperature environment. During the production process, shrinkage should be carried out according to the specified temperature and time to avoid exceeding the specified conditions and time to affect the performance of the shrink film.

  2. How to deal with problems in the use of printed shrink film?

    When using printed shrink film, if problems such as blurred printing and uneven shrinkage occur, the printing process and shrinkage conditions need to be adjusted in time, or replaced with other types of shrink film. When adjusting the conditions of shrink film use, care should be taken to avoid any impact on product quality and production safety.

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