HP-RTM

HP-RTM stands for High Pressure Resin Transfer Molding (HP-RTM). It involves using high pressure to mix and inject resin into a vacuum-sealed mold pre-laid with fiber reinforcement

and inserts. The process involves resin flow filling, impregnation, curing, and demolding to create a composite product.

Keywords in the above introduction:

High Pressure: Compared to traditional RTM (Resin Transfer Molding), HP-RTM increases the injection pressure to 80 bar. The advantage of high-pressure injection is that the resin

can reach every corner more quickly, thereby increasing the fiber content and improving product performance, making it particularly suitable for complex parts.

Pre-laid: The pre-laid fiber reinforcement here refers to pre-cut fiber materials.

Pre-placed Insert: Inserts are components placed in the mold before molding. They can be made of metal or non-metal. This ensures that the inserts are encapsulated within the

molded part and cannot be removed. Whether pre-installed inserts are necessary depends on the product's structural design.

The above process can be illustrated with a simple process flow chart:

As mentioned earlier, the HP-RTM molding process is an optimized molding process compared to the traditional RTM process. Other RTM-based processes have also been developed

to further improve production efficiency and product performance, focusing on different optimization approaches. For example, HRC currently offers the HP-CRTM molding process.

The HP-CRTM molding process involves moving the mold upward by 0.5-1mm before resin injection in the HP-RTM process. This increases the gap between the sealed mold cavity

and allows for wider runners, reducing resin flow resistance. After injection, the mold is fully closed under high pressure, allowing the resin system to flow and fill the mold with the

closing pressure. This results in relatively low molding pressure, ensuring smooth fiber formation while maintaining high injection speeds.

The process flow chart is as follows:

HP-RTM is a widely used composite molding process across many industries. Its advantages include lower costs, shorter cycle times, higher volume production, and higher

quality (including excellent part surface finishes) compared to traditional RTM processes. It is used in a variety of industries, including automotive, shipbuilding, aircraft,

agricultural machinery, rail transportation, wind power generation, and sporting goods.

Below, let's examine some specific products produced using HP-RTM and its derivatives:

Carbon fiber electric skateboard

Carbon fiber hat beam

BMW i8 body side frame

AUDI AG's carbon fiber floor module.

Ultra-RTM technology is used in the molding process.