Bifilm Release Film for Manufacturing Composites
Release High Tech Films used for the Manufacturing of Composites
Bifilm in Reels for the Wrapping of Tubolar Items in the Roto-Traslaction Process
Bifilm has been designed in the early 80ies for the production of composite materials made with phenolic, epoxy and polyester resins and with glass, carbon and arammidic fibers.
It is a specially laminated film made with Cellofan P and Polipropilene Speciale.
The main feature of this film is that it can be used both with phenolic resins and with epoxy and polyesther resins, simply changing the side in contact with the resin.
It is used in the roto-translaction process to manufacture tubolar composites with circular and elliptical sections, and in the manual taping of irregular items.
General Features of Bifilm in the Manufacturing of Composite
Bifilm is made on our specifications, using selected films and a special lamination process.
This film has good mechanical properties and a limited heat-shrinkage during the curing cycle.
The special formulation of the film permits to use it with medium-high temperatures of polymerization (up to 140-150 C).
Thanks to the presence of cellophane it acts as an heat shield in case of high polymerization’s temperatures.
Direct Contact with Tubolar Composites
Thanks to the special chemical-physical composition Bifilm has release capabilities on both sides of the film. This film is not coated with laque or silicone for release purposes. In this way no transfer of coating or silicone and no contamination of the composite is possible, and there is no need to clean or sand the item after polymerization.
To release from the composite at the end of the polymerization the Cellofan side must be in contact with the phenolic resin.
If other resins are used the polypropylene side must be placed in contact with the termosetting resin.
When used in direct contact with the resin a glossy surface of the composite is obtained. In the production of tubolar items marked steps given by the thickness of the tape are left on the surface.
In the roto-translaction process and in manual taping it is used in reels to wrap the rod to manufacture in direct contact with the prepregs.
It has the functions to give high compaction to the different layers of prepregs in the wrapping phase, to keep all the termosetting resin within the item during the liquid stage, to give good compression to the manufactured article in the polymerization phase and to guarantee an easy release at the end of polymerization.
Product Availability
The available nominal thickness is 60 micron, the nominal unit weight is 70 grams per square metre, the nominal yield 14 square metres per kilogram.
Release Films and Tubolar Composite’s Features
Our films for the production of composites have outstanding performances only if they are properly used. Very important are, in particular, the wrapping of the tape and polymerization’s conditions.
On this subject a specific paper is available on request.
If you want to read something of the functions an high tech release film can do in the manufacturing to improve composites you can click here: Seven functions fullfilled by high tech release films in the manufacturing of tubolar composites
For any further information on films for composites, please don’t hesitate to contact us. Our technical department is at your disposal you may need for any explanation, in-depth analysis, tests, new product or application development both for films and for the production processes of composites.
For further infomations write, phone, send an email at:
A. Peruzza srl – via Portelle 1 – 31010 Mareno di Piave – Tv – Italia
Telefono: (int+ 39) 0438 492335. Telefax: (int+ 39) 0438 492365
Email: info@aperuzza.com
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