High Quality Moisture Proof PVC PVDC Laminated Film For Pharmaceutical

High Quality Moisture Proof PVC PVDC Laminated Film For Pharmaceutical

Material Properties and Composition

Polymer Structure: PVDC is a copolymer of vinylidene chloride and other monomers (such as vinyl chloride in some cases). The high chlorine content in PVDC (around 73% by weight) gives it excellent barrier properties. The polymer chains are highly ordered, which restricts the movement of gas and moisture molecules through the film.

Additives: PVDC films may also contain additives to improve their processability and stability. For example, lubricants can be added to reduce friction during film extrusion and coating processes. Anti - blocking agents may be used to prevent the film from sticking to itself or other surfaces.

Formability and Processing

Coating and Lamination: PVDC is often used as a coating material on other substrates (such as PVC or paper) due to its excellent barrier properties. The coating process can be carried out using various methods such as extrusion coating or solution coating. In lamination, PVDC films are combined with other materials to create a multi - layer packaging structure that takes advantage of the unique properties of each material. For example, a PVDC - laminated PVC film can combine the formability of PVC with the superior barrier properties of PVDC.

Processing Challenges: PVDC films can be more difficult to process than some other packaging materials due to their high - strength and rigid nature. Special care must be taken during extrusion and coating to ensure uniform film thickness and quality. The melting point and rheological properties of PVDC require precise temperature and pressure control in the processing equipment.

FAQ

How is PVDC film different from other packaging films like PVC or PE?

Compared to PVC (Polyvinyl Chloride), PVDC has superior barrier properties, especially against moisture and gases. PVC has a lower chlorine content and generally doesn't provide the same level of protection as PVDC. In contrast to PE (Polyethylene), which is known for its flexibility and toughness, PVDC's strength lies in its barrier capabilities. PE is more commonly used for applications where flexibility and impact resistance are key, while PVDC is chosen for its ability to keep products isolated from the external environment.

What are the key properties of PVDC film?

The most important property of PVDC film is its excellent barrier performance. It has a very low moisture vapor transmission rate (MVTR), which means it effectively blocks the passage of water vapor. It's also a great gas - barrier material, with low permeability to oxygen, carbon dioxide, and other gases. Additionally, PVDC film has good chemical resistance, which allows it to come into contact with a variety of substances without degrading.

How should PVDC film be stored and handled?

PVDC film should be stored in a cool, dry place away from direct sunlight and sources of heat. It's important to protect it from physical damage during handling, such as scratches or punctures, as these can affect its barrier properties. When handling PVDC film in a manufacturing setting, it's necessary to use clean equipment to avoid contamination, which could also impact its performance.

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