Recreational Boats - Building of Fiberglass (composite)

2010-07-13T03:07:00.000-07:00

Is obtained :
- manual laminar layers of fiberglass impregnated with polyester resin
- combined and applied chopped fiber (polispray), the mold
- vacuum bagging

Surface preparation

1. First mold release wax applied in thin layers using a sponge and plain. Work the wax in small circles.
2. The next step is the application layer demulant liquid, that is polyvinyl alcohol.
3. After demulantul liquid dries, it can move towards gelcoat the mold., read more…….

Applying the mold gelcoat

Highly recommended for execution pleasure boats gelcoat fiberglass is gelcoat isophthalic with neopentilglicol, it has a high hardness, very bright, high resistance to marine conditions and does not absorb water. Usually, it uses white pigment.
Gelcoat is ready for use after adding the percentage of hardener (methyl ethyl ketone peroxide), read more………

Tips / Key Points

Gelcoat be mixed before use (10 minutes to 24 hours). A low viscosity will cause excessive mixing, increasing the risk of flow and formation porosity.
Gelcoat be mixed deep and surface, avoiding turbulence, read more……

Lamination

The first layer consists of a reinforcement layer stratimat 300 g / mg powder. Be applied after the gelcoat has hardened layer (between 30 min. And an hour, but no more).
Use a polyester resin tixotropizat general use, with the addition of hardener recommended. Do not mix more resin than you can use a period of 20 min.
Resin applied over gelcoat spray strengthened by your age or with a brush, roller or lamb leather. Should apply a thick and smooth, if it can double in weight over ranfort. The first layer of resin and fiber moisten be pressed to follow the contour model without double layers, cuts or scratches.
Then go to these three layers, only that here you use stratimat 450 g / mg. Stratimat combining the cuts from this layer and the following should be done with an overlap of 50 mm.
Thus, the piece will have a total thickness of approx. 5.5 mm, and will have the following structure:
- gelcoat,
- one one mat 300 g / mg
- one three layers of matte 450 g / mg
- one one layer of fabric 500 g / mg
-one one layer of mat 300 g / mg, read more………
Let the rod surface to dry in a day or two after mold that can be extracted.

Deburring or cleaning

Deburing is execute with angular grinder. Trimming or deburring is performed with an angular grinder or other machine of its kind.
All edges from cutting or grinding, must be applied by brush to have a layer of resin to cover the heads of fiberglass.

2010-06-30T03:30:00.000-07:00

MAKING A MOLD

Fiberglass-reinforced polyester molds can be used for different / various manufacturing processes. The most widely used application is manufacturing pieces manually or with combined machines of chopping and applying fiber (polispray). In building a mould is important the experience of the one who works and it is recommended to choose the materials carefully which ensures the long-term quality of the mould.

Whatever of the application, the mould composed of two independent layers: surface layer, structure or strength layer.

Surface layer gives the shape and the quality of the piece and, therefore, has a special importance/ significance.

The structure layer confers resistance and mechanical stability and varies according to the way the mould will be used

berglass-reinforced polyester moulds can be used for different / various manufacturing processes. The most widely used application is manufacturing pieces manually or with combined mach.

1. Construction model (Masters)

The first step in building the mold is making model. Parent or may be specially constructed wooden, plaster, metal or other materials that can not be attacked by styrene monomer. Model is to have good dimensional stability and surface quality must be at least as good as finished parts is desired. Surface treatment includes waxing, sanding, varnishing and polishing , READ MORE .....................

2. Application of matrix gelcoat

Gelcoat are created based on unsaturated polyester resins selected to achieve high HDT.This feature will allow a large number of pieces in the same mold. These gelcoaturi are ready for use after adding the percentage of hardener (methyl ethyl ketone peroxide) ,

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3.Tips

Using gelcoat matrix is required to obtain a faultless surface, glossy and durable.The operator must strictly monitor and control the application procedures. A large number of mistakes do not occur until after mold release and are caused by non-compliance of use,

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4. Laminate surface

The first layer is reinforced veil In an area, plus a layer of chopped fiber (stratimat) 300 gsm, powder. Be applied immediately after the gelcoat has hardened layer well (from at least 3 hours and up to a maximum of 6 hours).

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5. Laminate strength and structure

Manually produced molds must be reinforced by additional rolling resistance layer and adding inserts. Alternatively, the matrix can be strengthened by making a rolling resistance layer sandwich,

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6. Insert and holders

Inserts and support can not be applied until the surface layer did not dry for at least two weeks.
To reduce the risk of internal stress and dimensional change of the laminate, teaching or reinforcing elements of steel angles or similar sections must be assembled on the mold after having been preassembled,

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7. Removing mold from the model

If the model surface is resistant to styrene monomer and if wax was carefully should not experience problems in removing the mold from the model.

Connecting the compressed air ejector, mold can be removed from the model,

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8. Materials needed

Gelcoat for molds, resin molds, general purpose resin, gelcoat for molds, peroxide M.E.C. (hardener)

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Recreational Boats - Building of Fiberglass (composite)

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