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Applications:

Cast films are used for food and textiles packaging, flower wrapping, as photo album page protectors, as coating substrates in extrusion coating processes or laminated to other materials in the formation of more complex films, among others. Typically, the cast film process involves the use of coextrusion, which is a simultaneous extrusion of two or more materials from a single die to form a multi-layered film. This is because in many cases the final application of the plastic film demands a performance that cannot be achieved if the film is composed of only one material. For example, in many instances food packaging applications require the use of films with oxygen barrier capabilities. To meet the requirement a high oxygen barrier material like EVOH is combined with polyolefin materials in a multi-layered structure. Coextruded films typically contain up to seven layers; however, the use of more layers is becoming more common. The number of layers, their position in the coextrudate and their individual thickness are all variables that change depending on the particular application of the film.

Benefits/Limitations of Cast Film Extrusion Machine

Unlike the blown film process, the cooling of the film with cast extrusion is highly efficient. This allows for higher production line speeds resulting in higher production rates with superior optical properties of the product. The degree of draw and orientation is significantly lower in the cast film process than in the blown film process. This is the reason why the thickness distribution
in the machine cross direction is more uniform with cast processes (with variations that could be as low as ± 1.5%)
In cast extrusion the edges of the film are trimmed due to dimensional irregularities and/or poor layer distribution. As a result, the process can be negatively affected if the trimmed material cannot be recycled. Recent flat die system technology has minimized this problem by significantly reducing the amount of wasted material in coextrusion processes. This subject will be covered to some extent in a subsequent section
The table below shows the specifications of these coextruded films. In the structures, EVOH is used to provide the oxygen barrier, the presence of PP as a skin layer facilitates the thermoformability of the film, and the PE used as a skin layer acts as a heat-sealing material. Combining PVdC with EVOH is an effective way to address the potential loss of oxygen barrier capabilities experienced by the EVOH when exposed to moisture like in the case of meat packaging. Nylon material is used in combination with EVOH to provide added barrier when the film is to be thermoformed and the rigidity of the EVOH limits the thickness of the EVOH layer.

Factory Add : -
Ocean Extrusions Pvt Ltd
Plot No. 01, Survey No. 325,
B/h. Jalaram Saw Mill,
Kujad, Daskroi,
Ahmedabad, Gujarat, INDIA - 382430

Corporate Office :-
Ocean Extrusions Pvt Ltd
B-101, First Floor,
Galaxy Business Park,
Opp. Torrent Power Station,
Sardar Patel ( SP ) Ring Road,
Nikol, Ahmedabad, Gujarat, INDIA - 382415.

Email: [email protected], [email protected]

Web:

http://www.blownfilmline.in/
http://www.oceanextrusionsmachine.com/

Mo: +91-97243 25401