Shrink Film Manufacturers in Chennai

Manufacturing Of Shrink Film in Chennai

Almost all plastic films shrink to some extent. In most packaging applications, dimensional stability is desirable and shrinkage is considered to be detrimental. However, in some packaging application, controlled shrinkage is deliberately used for certain objectives to be fulfilled. For example, shrink film is used to pack products with a tight pilfer-proof wrap over carton and boxes, so as to utilize number of packs or items on pallet, etc.

Shrinkable Films in Chennai

A variety of shrinkable films have been developed to meet the requirements of many different end-use applications. Heat-shrinkable film is made by stretching or orienting a conventional film at a temperature close to its softening point (i.e. Tg) and then quenching or freezing the film in the oriented state. The film that undergoes a special stretching and cooling process, causes an orientation in the film and introduces frozen-in shrinkage stresses, which can be given hot air treatment or infra-red radiation.

 Environment Friendly And Safety To User

• Polyolefin films are free from toxic and odour during processing
• Approved for direct food contact by the USDA and FDA in United State of America, Canada and Europe.

 Plastics Used For Shrink Film / Stretch Wrapping

Shrink and stretch wrapping can be quite complex in their structure. Most of the packaging films that are used for shrink and stretch wrapping are from the polyolefin range.

These are materials produced from oil based chemicals by what is called a polymerization process, which basically means getting the right molecules and atoms to club together in a way that is required Shrink Pack 342 or desirable for a particular application. The most common plastic materials are polyethylene, polypropylene and poly vinyl chloride.

Why Is Shrink Film Necessary For You?

Polypropylene is comparatively less used in shrink and stretch wrapping, because it is slightly harder than the other commonly used materials. It has a higher melting temperature and is less stable when shrinking. However, many over-wrapping machines use polypropylene and some can be put through a shrink tunnel to give a slight tightening effect. PVC is a dense material. As most polymers are sold by weight and there has been ecological pressure in Europe and America against its use, sometime use of PVC is restricted. However, it is still considered to be a common material in India, when clarity is an important selection criterion, particularly for consumer packaging.

Plastic Films Used

In short, following plastics films are commonly used for shrink and stretch wrapping:

Polyethylene

Polyethylene used almost exclusively or as a combination of LDPE + co-polymers EVA (Ethylene Vinyl Acetate) or EEA (Ethylene Ethyl Acrylate).

Copolymer Modification: LDPE is sometimes modified by addition of EVA and EEA.

EVA is approved by US-FDA for direct contact with food.

EEA is approved up to 7% for direct contact with food. However, Vinyl Acetate (VA) or Ethyl Acrylate (EA) content is normally restricted to 3-4%.

Irradiated polyethylene film containing EVA, shrinks strongly in boiling water and is generally used for wrapping chickens.

In the form of mono-layer or 3/5 multi-layer, 3 layer wide shrink films of HM-HDPE (rolls/bags), LLDPE (rolls), etc. are available for palletized goods; Diameter > 5m and Lay Flat Width (LFW) > 10m; Film shrinks in area and increases in thickness.

This is usually used for protection of industrial products from dust, contamination, rain, etc.

Heat required for shrinking PE film: about 200°C for 100g film and 300°C for 500g film.

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