Low Temperature Co Extruded Vacuum Bag

1. Product introduction

Low temperature co-extruded vacuum bag is a high performance packaging film specially designed to adapt to low temperature environment. Such films are usually made of multiple layers of different materials co-extruded to maintain their physical properties and chemical stability at low temperatures. Low temperature co-extruded vacuum bag not only has good mechanical strength and barrier properties, but also has excellent temperature resistance characteristics, can perform well in low temperature environment.

2. Main features

Wide temperature adaptability: Low temperature co-extruded vacuum bags can maintain good performance in the temperature range of -40°C to 120°C, whether in hot summer or cold winter, to ensure the safety of the contents of the package.

Excellent mechanical properties: Even under low temperature conditions, the low-temperature co-extruded vacuum bag can maintain its tensile strength and puncture resistance, effectively prevent packaging damage, and protect the contents from damage.

Excellent barrier performance: Low temperature co-extruded vacuum bag has excellent oxygen, moisture and odor barrier properties, can effectively extend the shelf life of products, especially for food, medicine and other products with high preservation requirements.

High transparency: The low temperature co-extruded vacuum bag has a high transparency, making the packaged product clearly visible, easy to identify and manage, but also improve the display effect of the product.

Environmental characteristics: The material of the low-temperature co-extruded vacuum bag meets the requirements of environmental protection, can be recycled, and reduces the impact on the environment. In addition, due to its excellent barrier properties, the use of plastic materials can be reduced, further reducing the carbon footprint.

3. Product advantages

Excellent cold resistance: Low temperature co-extruded vacuum bags maintain good performance at extremely low temperatures. It can withstand temperatures of -50 °C or lower, which makes it excellent for the storage and transportation of frozen foods, cryogenic medicines and biological products. For example, during the long-term storage of frozen meat, even in the cold storage environment of -18 °C or even lower, the bag will not become brittle and crack, ensuring the integrity of the package.

Low temperature flexibility: In a low temperature environment, the vacuum bag still has good flexibility. This is thanks to the special material formulation and co-extrusion process, whose molecular structure allows the bag to maintain a certain degree of elasticity at low temperatures. Unlike ordinary bags, which are easy to harden and become brittle at low temperatures, low-temperature co-extruded vacuum bags can adapt to various operations at low temperatures, such as handling, stacking, etc., and will not be damaged by slight bending or extrusion.

Excellent gas barrier: Excellent barrier ability for oxygen, carbon dioxide and other gases. The barrier layer in the multi-layer co-extrusion structure, such as using ethylene - vinyl alcohol copolymer (EVOH) and other materials, can effectively reduce the gas transmission rate. In terms of food packaging, for products that need to prevent oxidation deterioration, such as nuts, bacon, etc., even in a low temperature environment, the oxygen content in the package can be controlled at an extremely low level, extending the shelf life of the product, and maintaining the flavor and nutrition of the food.

Good water vapor barrier: effectively prevent water vapor through. Whether it is in a humid low temperature environment or in the case of the product itself containing water, such as frozen fruits, seafood, etc., it can prevent external water vapor from entering or internal water vapor from escaping. This helps to maintain the original moisture content of the product, prevent the product from drying due to water loss or deterioration due to moisture, and ensure the quality of the product during low temperature storage and transportation.

Multi-layer co-extrusion structure advantages: The use of multi-layer co-extrusion structure, each layer has a specific function. The innermost heat sealing layer ensures a good heat sealing effect, making the bag tightly sealed to prevent air and microorganisms from entering; The intermediate barrier layer provides barrier performance; The outermost protective layer has abrasion resistance and puncture resistance. This multi-layer structure works together to make the vacuum bag have higher overall stability in low temperature environments and can resist the influence of various external factors.

4. FAQ

What is a cryogenic co-extruded vacuum bag?

Low temperature co-extrusion vacuum bag is a special vacuum bag made by co-extrusion technology. It can still maintain good performance in low temperature environment, such as flexibility, barrier, etc., and is mainly used for product packaging that needs to be stored or transported at low temperatures.

What is the minimum temperature that low temperature co-extruded vacuum bag can withstand?

In general, high-quality low-temperature co-extruded vacuum bags can withstand temperatures of -50 °C or even lower. However, the specific minimum temperature tolerance also depends on its material composition and manufacturing process.

How flexible is it at low temperatures?

In low temperature environment, low temperature co-extruded vacuum bag has better flexibility. This is because it uses a special polymer material formulation and co-extrusion process, even at low temperatures, although the activity of the molecular chain is limited, the bag will not become brittle and hard, and it can still maintain a certain elasticity, so as to avoid cracking or damage at low temperatures.

What is the structure of the low-temperature co-extruded vacuum bag?

It is usually a multi-layer co-extrusion structure. The innermost layer may be the heat sealing layer in direct contact with the product, which has good heat sealing performance and chemical stability; The middle layer is often a barrier layer, such as the use of ethylene-vinyl alcohol copolymer (EVOH) materials, used to block oxygen, water vapor, etc. The outermost layer may be a protective layer with abrasion resistance, puncture resistance and other properties to cope with external pressures during transportation and storage.

What are the main materials used to make low-temperature co-extruded vacuum bags?

Common materials include different types of polyethylene (PE) (e.g. LDPE, LLDPE), which are used to provide flexibility and heat sealing; EVOH is used for gas and water vapor barrier; Polypropylene (PP) is used to increase strength and wear resistance. These materials are combined by a co-extrusion process.

Will the barrier properties of low-temperature co-extruded vacuum bags be affected at low temperatures?

At low temperature, its barrier performance can still maintain a good level. Although the temperature reduction may slow down the molecular movement, due to the characteristics of the material itself and the design of the multi-layer structure, the barrier ability of oxygen, carbon dioxide, water vapor, etc., will not be significantly reduced, so as to effectively protect the products in the bag.

How well does it block oxygen and water vapor?

Excellent barrier to oxygen and water vapor. Through the intermediate layer barrier materials, such as EVOH, can control the oxygen and water vapor transmission at a very low level. For example, in food packaging, food can be prevented from deterioration due to oxidation and moisture.

What are the applications of low-temperature co-extruded vacuum bags in the food industry?

Widely used in food industry. For example, in the packaging of frozen meat, fish, ice cream and other products, it can maintain the freshness, taste and quality of the product. Prevent frostbite, oxidation and odors during low-temperature transportation and long-term frozen storage.

Is it applicable in the medical field?

Yes, in medicine. For some drugs and biological products (such as vaccines, blood products, etc.) that need to be kept at low temperature, low-temperature co-extrusion vacuum bags can provide good protection to prevent drugs from moisture, oxidation and microbial contamination, and ensure the effectiveness and safety of drugs.

How are low temperature co-extruded vacuum bags produced?

Produced by co-extrusion equipment. The different polymer materials are heated to a molten state respectively, and then extruded simultaneously through a special mold according to a predetermined structure and thickness ratio to form a film with a multi-layer structure, and then made into a vacuum bag through a bag-making process.