L-RTM Technology Exchange and Sharing-RTM Closed Mold Mat
To make a good L-RTM mold, you must prepare well, especially to have a detailed understanding of the drawings, careful design, and accurate review.
The raw materials must be strictly checked, and gel experiments must be done before use to ensure that the purchased materials are within the shelf life.
There must be a clean working environment and working conditions at room temperature must be guaranteed. If you are equipped with responsible employees, you will achieve twice the result with half the effort!
There are two important points for lightweight RTM molds: the width and firmness of the skirt. The width of the skirt is the requirement for sealing and mold closing, and the firmness of the platform ensures that the material does not deform during the curing process.
2 Primer Treatment On The Surface Of The Model
The original model is usually repaired with putty and then sprayed with primer. The model’s shaped areas and R corners will be deformed or distorted if putty is used to scrape. However, spraying primer has advantages. Spraying primer only thickens the original shape. The effect of model processing determines the “life” of the mold.
3 L-RTM Mold Gel Coat
The mold gel coat is very important, including hardness, brightness, toughness, pinholes, etc. If the mold gel coat is too hard, it is easy to crack and difficult to mold. The pinholes and bubble removal of the mold gel coat are related to the operation. A good mold gel coat must have all the advantages.
4 L-RTM Fatigue Resistant Layer
The resin of the mold fatigue resistance layer is the most critical, but the fiber is more important. The glue content of the surface layer, the paste making method, try not to apply putty.
5 L-RTM Mold Reinforcement Layer
The mold reinforcement layer mainly considers shrinkage, and generally uses zero shrinkage resin and strong core mat. The paste thickness is determined according to the size and structure of the mold.
6 L-RTM Mold Reinforcement
Lightweight RTM does not require high reinforcement. The frame is made of metal or wood and can withstand the weight of the mold.
7 L-RTM Mold Cavity
The most critical part of lightweight RTM mold production is the mold cavity, air chamber, resin channel, injection and extraction port, and two seals.
8 L-RTM Mold Positive and Negative Fuzzy Production Completed
The mold is completed as a whole. Before demolding, make sure there is no gap between the upper and lower molds. If there is a gap, it will not affect the sealing.
9 L-RTM Mold Grinding and Polishing
Sanding sandpaper is not only about choosing the grit, the quality of the sandpaper is also very important, and you also need to pay attention to the way and technique of sanding.
10 L-RTM Release Agent Treatment
The L-RTM mold is completed. The positive mold should be smooth and clean, and the back mold should be light and smooth.
12 L-RTM Product Production
L-RTM molds can be used to make products without equipment, and the efficiency will be higher if there is equipment.
13 L-RTM Mold Opening
Since the L-RTM mold has molds on both sides of the product, the force is applied evenly up and down and around the product.
14 L-RTM Products
L-RTM products have the advantages of smooth double-sided and uniform thickness. The surface of the product can also be added with closed mold surface mat to block the fiber texture.
15 L-RTM Product and Mold Analysis
L-RTM product has problems
▶Product vortex is in the same position
▶Product vortex is in different positions
▶The product had no problems before, but dry area and vortex occurred recently
▶The fiber texture on the product surface is heavy
▶The gel coat on the product surface has orange texture
▶The gel coat surface has resin after demolding
L-RTM product problem analysis
▶The injection port and the exhaust port are designed unreasonably, and the exhaust port position is moved
▶The mold cavity thickness is uneven, the fiber is not well impregnated, and the resin viscosity increases
▶Whether to change the material, the temperature drops, the equipment bubbles are not exhausted, and the filler is precipitated
▶Increase the surface mat, improve the curing degree, select a resin with low shrinkage, and increase the filler
▶Select high-quality gel coat and curing agent, improve the atomization degree of the gel coat, and ensure the brightness of the mold gel coat
▶The gel coat is demolded, select a high-quality release agent, the gel coat is uneven in thickness, and the fiber should be laid flat
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