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Pultruded Fiberglass Molding Process
- Jul 17, 2017 -

Pultruded Fiberglass Molding process

Product application and forming process analysis

Pultrusion technology is a method of continuous production of composite material, it is the untwisted yarn frame glass fiber roving and other continuous reinforced material, polyester resin impregnated surface mat and so on, and then by keeping a certain section in the shape of a forming die, and make it straight out of the mold after mould curing, thus forming pultrusion products of an automated production process.

The tensile strength of the product is higher than that of ordinary steel. On the surface of the rich resin layer, make it has good corrosion resistance, therefore in the corrosive environment of engineering is the best product to replace steel, widely used in transportation, electrician, electrical, electrical insulation, chemical, mining, Marine, boats, corrosive environment and life and civil fields.

Pull extrusion molding process flow

There are many forms of pultrusion, and there are many classification methods. Such as the intermittent and continuous type, vertical and horizontal, wet process and dry process, the caterpillar drawing and clamping type traction, mould and mould gel mould curing, heating mode with electric heating, infrared heating, high frequency heating, heating or combination of microwave heating, etc.

The typical technological process of pultrusion is:

Glass fiber roving cloth - leaching - preforming - extrusion molding and curing - traction - cutting - products

Make up the molding equipment

1. Strengthen the material delivery system: such as yarn rack, felt spreading device, yarn hole, etc.

2. Resin impregnation: straight slot impregnation method is the most commonly used. During the whole process of impregnation, the fiber and felt arrangement should be in order.

3, preforming: varnished reinforced material through the preforming device, is careful to pass in continuous way, so as to ensure that their relative position, products gradually close to the final shape, and squeeze out excess resin, and then into the mold, molding curing.

4. Mold: the mold is designed under the conditions of system determination. According to the heat curve of resin solidification and the friction performance of materials and molds, the mold is divided into three different heating areas, and its temperature is determined by the performance of the resin system. The mold is the most critical part of the process of pultrusion, the length of typical mold is between 0.6 and 1.2 m.

5. Traction device: the traction device itself can be a crawler or two reciprocating motion clamping device to ensure continuous movement.

6. Cutting device: the profile is cut by a cutting saw that is automatically synchronized and cut at the required length.

The function of molding tool is to realize the compaction, molding and solidification of billet. The size of the die section should consider the shrinkage of resin. The length of the mold is related to curing speed, mold temperature, product size, speed of pultrusion, and the properties of reinforced materials. Generally, it is 600 ~ 1200mm. Mold cavity finish is high to reduce friction, prolong service life, easy to release. The high performance composite is usually heated by microwave heating. The mold population should have a cooling device to prevent the gelatine from curing prematurely. The dip process mainly grasps the density (viscosity) and the dip time. The requirements and influencing factors are the same as preloading.