Cellophane P45 – P60 Release Film for Manufaturing Composites
Release High Tech Films used for the Manufacturing of Composites
Cellofan in Reels for the Wrapping of Tubolar Items in the Roto-Traslaction Process
In the 70ies the first fishing rods in composites were made with phenolic resin and fiberglass. Cellofan P45 – P60 was the first film used for this production, thanks to its release capabilities from phenolic resins.
Nowadays it is used in the roto-translaction process for manufacturing composite tubolar items in 2 different ways: with phenolic resins in direct contact and as over wrapping in particular to made an heat shield, for all thermosetting resins.
General Features of Cellofan in the Manufacturing of Composites
Today the use of phenolic resins in the production of composites is limited to particular fields (items that have to withstand high temperatures or aggressive environments, such as exhaust pipes of sea engines).
Nevertheless Cellofan P60 has found a new youth in the manufacturing of tubolar composites with epoxy and polyesther resins and with fiberglass, carbon and arammidic fibers because it is extremely effective when used as over wrapping film. In particular it improves the structural properties of tubolar composite items of top quality and/or with an high thickness of composite’s walls.
Cellofan P45 – P60 has good mechanical properties and a limited but significant heat-shrinkage during the curing cycle. The material is hygroscopic and the moisture absorption can be used to give extra compression during cooking.
The chemical nature of the film (regenerated cellulose film) permits to use it with medium – high – and very high temperatures of polymerization (up to 200-220 C). Thus it can act as an heat shield in case of high polymerization’s temperatures.
The film is treated on both sides and releases easily from phenolic resins at the end of the process.
Phenolic Resins and Direct Contact
When used in direct contact with the phenolic resin a glossy surface of the composite is obtained. In the production of tubolar composite items light or medium steps given by the thickness of the tape are left on the surface.
In the roto-translaction process it is used to wrap the tubolar composite item to manufacture in direct contact with the phenolic resin (primary wrapping).
It has the functions to give high compaction to the different layers of fibers 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.
Over Wrapping Film and Heat Shield
The alternative use is as over wrapping film (double taping of compaction and compression), for all types of resins, to produce tubolar composite items of top quality (industrial rolls, high end sports articles, structural tubolars with high thickness of composite’s walls).
In this way if the film is tensioned at its maximum load a further light step on the surface could be made.
Usually another film is placed in contact with prepregs and Cellophane P60 is used both to give extra compaction and compression to the rod and to act as a thermal shield in presence of high temperatures of process.
With this method, if it is properly carried out, the use of Cellofan P60 gets significant improvements in the composite’s structure.
Product Availability
The available nominal thicknesses are 32 and 42 micron, the density is approximately 1,45 g/cm3, the nominal unit weights are 45 and 60 grams per square metre, the nominal yields 22 and 16 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 the production of 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 products or application developments both for films and for the production processes of composites.
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