Enhanced Reaction Injection Molding (R–RIM) is a closed-mode process. The two resins are heated separately and then poured into the stirring container together with the grated glass fiber.

The resin and the grated fiber are mixed, injected into the mold cavity and compressed. The resin reacts quickly and solidifies into a composite, such as a-level surface of the car body panel.

Structural Reaction Injection Molding (S–RIM) uses fiberglass fabrics, felts and preformed materials to produce structural composite products.

In the SRIM process, thermosetting polyurethane resin is first mixed under high pressure, and then injected with the fiber-reinforced material of the hot mold, and then finally solidified into components, such as large-scale leather compartment, etc.

It can also be produced through the foaming process of low-density non-structural components, such as automotive interior panels.

Reaction Injection Molding

In the reaction injection molding process, the resin-usually thermosetting polyurethane-is mixed in a closed cavity under a certain pressure. This process is widely used in the automotive industry, the production of car, car parts.

In addition to the LRTM process, a soft mold RTM process is currently in vogue.

The soft mold RTM process takes into account the advantages of RTM and vacuum diversion process, the RTM rigid mold into a silicone or rubber soft mold, its effect is equivalent to a layer of vacuum bag film, products in the soft mold and mold, sealed around, Suction vacuum (0.1MPa or so), while pumping the resin from the other end of the mold from the pipeline into the mold, will enhance the glass fiber infiltration. After curing the demoulding.

The characteristics of soft mold RTM molding technology:

1, can manufacture two sides light shape structure complex product;
2, molding efficiency is general, suitable for medium-scale FRP products production (1000 pieces/years);
3. The reinforcement material can be paved in any direction, and it is easy to realize the reinforcement material by the stress condition of the product.
4, the service life of the soft mold is about 10-50 times, the cost is between RTM and vacuum diversion process is currently used for boats, automobile parts, engineering vehicle cover and fine relief technology.

Soft mold RTM Molding process, the same does not require injection equipment, only a vacuum pump can be;

Mold needs one-sided rigid die general cavity is negative pressure 0.1MPA, the raw materials used and vacuum diversion of the same material.

The efficiency of the process is between RTM and vacuum diversion, and its desirability lies in the reusable nature of the vacuum auxiliary material used, and the convenience of its application in the construction process,

Advantages One, consumable can be reused many times, reduce cost;

Advantages of the second, according to the mold can be made of a variety of complex shapes, easy to pave, and can effectively avoid bridges and dry areas;

The advantages of three, excellent toughness, injection process if there is a dry point, can be vigorously pulled, man-made resin diversion route, do not worry about the vacuum bag was destroyed.