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High Barrier Property PVC/EVOH/LDPE Composite Hard Sheets For Medcial Packaging Material

It is a kind of composite hard sheet produced by coating and compounding process with medcial PVC as substrate.
  • PVC EVOH LDPE

  • WALLIS

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PVC/EVOH/LDPE high-barrier composite rigid sheet is a multi-layer functional packaging material that combines the advantages of different materials. It has excellent barrier properties and practical characteristics, and is mainly used in fields with high requirements for packaging barrier properties (such as pharmaceuticals, food, etc.). The specific description is as follows:



Structural composition:

It is composed of three layers of materials, which are PVC (polyvinyl chloride), EVOH (ethylene-vinyl alcohol copolymer), and LDPE (low-density polyethylene) from the outside to the inside. Each layer has a clear division of labor: PVC provides rigidity and structural support, EVOH is the core barrier layer, and LDPE is responsible for heat-sealing performance and flexibility.


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Core properties:


1)High barrier property: The EVOH layer has extremely strong barrier ability against oxygen, carbon dioxide, odors, etc., which can effectively prevent the contents from deteriorating due to oxidation, moisture absorption or odor mixing, far better than single PVC or PVC/PE composite rigid sheets.


2) Mechanical properties: The PVC layer endows the material with sufficient rigidity and stiffness, making it easy to process and form (such as pressing into packaging grooves), and has good impact resistance, suitable for transportation and storage.


3) Heat-sealing property: The LDPE layer has good heat-sealing adaptability and can be firmly sealed with other packaging materials (such as aluminum foil, composite film, etc.) to ensure the tightness of the package.


4)Environmental resistance: It has strong tolerance to changes in temperature and humidity, and can maintain stable performance under different storage conditions.



 Main applications:

Widely used in the packaging of products that need long-term preservation, such as solid drugs (tablets, capsules), health products, high-end food (such as chocolate, nuts), etc., especially suitable for items sensitive to oxygen and prone to oxidative deterioration.



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General Specificatios:


1)Thickness: The common thickness range is 0.055mm-2mm. For example, the specifications used for liquid packaging include 0.25mm (PVC)/0.75mm (EVOH)/0.05mm (LDPE), etc.


2)Width: There are various width specifications, usually around 50mm-1400mm. Common ones are 300mm, 423mm, 557mm, 665mm, etc. Products with wider or narrower widths can also be customized according to requirements.


3)Others: The density is generally around 1.3-1.5g/cm³. It comes in various colors such as transparent, white, yellow, etc. The surface is usually required to be bright, clean and glossy.


 Advantages:

Compared with traditional composite rigid sheets, its barrier properties are more comprehensive, which can significantly extend the shelf life of the contents; the multi-layer structure design takes into account rigidity, sealing and processability, meeting the needs of complex packaging scenarios.


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