Polipropilene Alto Modulo Release Film for Manufacturing Composites
Release High Tech Films used for the Manufacturing of Composites
Polipropilene Alto Modulo in Reels for the Wrapping of Tubolar Items in the Roto-Traslaction Process
Polipropilene Alto Modulo has been developed, thanks to the company’s research, at the end of the 80ies, in the same period of the introduction in the market of the first high modulus carbon fibers.
Polipropilene Alto Modulo is a universal film widely used in the production of composite materials made with epoxy and polyester resins and with glass, carbon and arammidic fibers.
This polypropylene film can be used in many production methods. It is used both with the roto-translaction process (to manufacture tubolar composites with a circular or elliptical section, and with a conical or slightly conical structure), both with manual taping (to get complex or irregular shaped items), and in moulding (to produce both flat panels and complex forms). In particular, used alone with a double passage of wrapping, Polipropilene Alto Modulo is the best solution for cheap tubolar items, with limited wall’s thickness.
General Features of Polipropilene Alto Modulo in the Manufacturing of Composite
Polipropilene Alto Modulo is made on our specifications, with a targeted recipe concerning the polypropylene grade and a peculiar production process which gives mechanical strength and other physical features.
This polypropylene film has very good mechanical properties, and an enhanced 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 special chemical-physical composition Polipropilene Alto Modulo has release capabilities on both sides of the film. This polypropylene 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.
When used in direct contact with the resin a glossy surface of the composite is obtained. In the production of tubolar items light 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 both in direct contact with the resin (primary wrapping) and as over wrapping film (double taping of compaction and compression). The mechanical properties are exploited to give an high tensioning to the tape and get thus an heavy compaction of the different layers of prepregs.
Heat shrinkage is used to get an high compression force during the resin’s polymerization.
The two things together achieve an high specific pressure on the surface of the tubolar, improving thus the structural properties of the item.
Primary Wrapping
Used as primary wrapping 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.
Over Wrapping
In over wrapping another film is commonly used in contact with the resin and Polipropilene Alto Modulo is used to give extra compaction by tensioning and higher compression by heat shrinking.
Moulding
In moulding it is used in sheets to get flat panels or complex forms and acts as resins constraint and releaser. A glossy surface is obtained.
The film is somehow ductile and fits well also with complex or irregular shapes of the mould.
Mould’s walls are protected and don’t need to be cleaned after each cycle or to be sanded periodically.
Product Availability
The available nominal thickness is 30 micron, the density is 0,91 g/cm3, the nominal unit weight 27 grams per square metre, the nominal yield 37 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.
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Telefono: (int+ 39) 0438 492335. Telefax: (int+ 39) 0438 492365
Email: info@aperuzza.com
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