LIf a special product which mold is not currently available is ordered, it will be processed during the following steps:
1) customer should send the shape of product
2) The thickness of the product varies according to the cross-sectional shape, but in general the thickness above 2.5 mm is suggested.
3) In next step, the mold is checked and the cost and delivery time will be informed to customer.
4) Requirements for making the template and its mandrel should be considered
5) After making the template the pre-production will be done and after optimizing the effective parameters, the production of the product begins.
Available Special Shapes:
1) Oval Cross Section 33*23 mm
2) E Section
3) Rail Cover
4) Hexagonal section
5) L Angle 100*100 mm
Pultrusion is a manufacturing process for producing continuous lengths of reinforced polymer structural shapes with constant cross-sections. Raw materials are a liquid resin mixture (containing resin, fillers and specialized additives) and flexible textile reinforcing fibers. The process involves pulling these raw materials (rather than pushing, as is the case in extrusion) through a heated steel forming die using a continuous pulling device. The reinforcement materials are in continuous forms such as rolls of mat and doffs of roving. As the reinforcements are saturated with the resin mixture ("wet-out") in the resin bath and pulled through the die, the gelatin or hardening, of the resin is initiated by the heat from the die and a rigid, cured profile is formed that corresponds to the shape of the die. While pultrusion machine design varies with part geometry, the basic pultrusion process
concept is described in the following schematic.
The creels position the reinforcements for subsequent feeding into the guides. The reinforcement must be located properly within the composite and this is the function of the reinforcement guides.
The resin bath saturates (wets out) the reinforcement with a solution containing the resin, fillers, pigment, and catalyst plus any other additives required. The interior of the resin bath is carefully designed to optimize the wet-out of the reinforcement.
On exiting the resin bath, the composite is in a flat sheet form. The performer is an array of tooling which squeezes away excess resin as the product is moving forward and gently shapes the materials prior to entering the forming and curing die. In the forming and curing die, the thermosetting reaction is heat activated (energy is primarily supplied electrically) and the composite is cured (hardened). On exiting the die, it is necessary to cool the hot part before it is gripped by the pull blocks (made of durable urethane foam) to prevent cracking and/or deformation by the pull blocks. Strong well uses two distinct pulling systems, one that is a caterpillar counter-rotating type and the other a hand-over- hand reciprocating type to pull the cured profile to the saw for cutting to length.
