FR2501103A1 - Use of polyester film to impart gloss to reinforced polyester surfaces - the film being removed after the other resin has hardened - Google Patents

Abstract

Mouldings or coatings of glass fibre reinforced polyester resin are given a high gloss finish using a shiny polyester film of high strength and moisture resistance (as used for tracing purposes by drawing offices) to line the mould or as an interface via which a cast or laid-up surface is consolidated and smoothed by a roller. After the reinforced resin has hardened, the polyester film is peeled off to expose the surface of the reinforced resin or the gel coat thereon. For application to an exposed surface or gel coat, as distinct from lining a mould cavity, the glossy polyester film is pref. at least 125 microns thick. Opt. the glossy film is self-adhesive on one face to help secure it in position on a support such as a mould surface. The polyester film does not adhere to the resins used as gel coats or matrix resins for fibre-reinforced thermosetting polyesters.

Description

DESCRIPTION
Invention concerning the finishing of pre-molds and molds, or of
parts executed without mold in plastic resin construction
fiber.

The present invention relates to the construction of plastic objects with
or without the use of an ioule.

In the techniques currently used for the manufacture of
molds or molds, the impeccable surface condition is obtained by pro
sanding, buffing, etc. In other cases, these are sheets
stainless steel or aluminum or formica-type plastics that give the ace
smooth pect.

The sanding processes are long and require a lot of labor
vre. Stainless steel or formica or other supports are expensive, difficult to neck
per, and too rigid for shapes with a small radius of curvature.

The device according to the invention saves the pon all the time
cage and finishing of the pre-mold, mold or object to be laminated.

It is only applicable to developable surfaces but it is quick to implement, light, handy, easy to cut and gives a surface stat
and an impeccable shine without release agent.

 The invention uses a material sold under the name polyester tracing or polyester film. This material is used for drawing in design offices, architectural offices, etc.

LAYER SAMPLE OR POLYESTER FILM
This layer is distinguished from the ordinary layer by better resistance to humidity and a higher resistance.

In the process according to the invention, the new use of this polyester layer for the construction of plastic objects can be done in 2 ways:
1 / cution of a pre-mound or a mold (plate I)
a) Construction of a rigid support & the shape of the piece to be obtained
The surface appearance of this support does not have to be
smooth. i fig. 1-)
b) Covering this shape with a polyester tracing sheet
cut to the dimensions of the workpiece. (fig. 2)
c) Projection on this tracing sheet of gel coat or resin
then application of the different layers of resin plus fibers
(fig. 3) d) after polymerization, the relief of the part is done. The freeze
coat or the resin does not adhere to the polyester layer. The on.

face obtained is perfectly smooth and shiny. The layer is re
usable. (fig. 4)
2 / Plasticization of an object (plate II)
a) Execution of the form to be laminated. This form can consist of
an object to restore by plasticization, make it waterproof, to ren
force. The object is covered with one or more layers of resin
ne and fibers according to the desired thickness. (fig. 5)
b) In general, the finish is obtained by sanding after poly {risaX
tion. The polyester layer is used after the installation of
the last layer of resin and fibers, before polymerization.

A tracing sheet is applied against the surface, with a roller
to prevent the formation of bubbles under the layer. (fig. 6)
c) After polymerization, the perfectly molded layer is removed.

The surface has a smooth and shiny appearance. The layer is reused
sand. (fig. 7)
These 2 new applications are possible thanks to the essential discovery that the polyester layer does not adhere to either the resin or the gel coat.

Due to its surface condition it also allows to obtain an impeccable shine.

In this new use of the layer, it would be advantageous to use thicknesses greater than 125 microns, not marketed to this day because without interest for the drawing.

On the other hand, the polyester layer can present either matt or glossy surfaces. The matt or shiny appearance has no influence in this application.

 The invention can be used between cyans in all cases ot a mold is used in plastic construction, and for the finishing of all plasticized objects.

 The applications of this process concern all industrialists in resin reinforced with fibers and also amateurs who want to laminate a single piece, without mold or lost mold,

Claims (3)

 REV.; NDICATIONS 1) Method of manufacturing plastic objects with or without mold comprising  the following stages: a) Installation, on a form intended to serve as a pre-mold or mold for the manufacture of an object made of resin reinforced with fibers, of a skin made up of the material known as polyester tracing or polyester film. This process uses the property that the polyester layer does not adhere to the resin or the gel coat. b) After plasticizing an object using resin reinforced with fibers, setting  in place of a skin made up of the material called polyester tracing  or polyester film. This skin, intended for finishing, makes it possible to obtain  a smooth and shiny plastic surface when the tracing paper is removed after polymerization of the plastic resin. 2) Method according to claim @ characterized by the use of a skin  having the same characteristics as the polyester film or tracing paper, a sample of which is attached to the description, even under another designation. 3) Method according to claims 1 and 2, characterized in that the  material may have a face consisting of a self-adhesive film facilitating bonding on the support. The film can be self-adhesive over the entire surface, or on a part only either by strips or by points.