Compression Molding Precision by Davies

What are the benefits of compression molding?

This molding process is known for its ability to mold large and fairly complex parts with excellent surface finish and accuracy. Also, the absence of shear forces during the molding process reduces the formation of what are called knit lines. Knit lines are lines on the product that occurs when the resin meets and joins together. The benefit of this process is a stronger and more structurally sound molded part as compared to other molding methods such as injection molding.

An additional advantage of compression molding is that the fibers are less likely to degrade in the composite materials. Fiber reinforcements, such as fiberglass, play a critical role in improving the strength and stiffness in the molded parts. During the compression molding process, the fibers are subjected to less shear stress, as compared to injection molding, preserving the length and alignment more effectively. Having less stress on the fibers leads to an improved final product.

Plus, there is a wide range of materials that can be used in compression molding including thermoset and other plastic or composite materials. These materials can be in the form of:

• Sheet Molding Compound (SMC)
• Bulk Molding Compound (BMC)
• Phenolics
• Melamines
• Silicone Rubber
• Polyesters
• Ureas
• Epoxies

Davies capability to mold these types of materials allows for creating lightweight, high-performance components for a wide range of industry partners.

In the case of thermoset molding and transfer molding, there is an advantage in the use of high-temperature thermoset materials. These materials exhibit a superior ability to maintain their shape compared to thermoplastics. There is minimal shrinkage throughout the molding process. When these composite parts will not degrade if they are subjected to extreme environmental conditions such as being exposed to high heat. This stability of these molded part is particularly valuable when the wall thicknesses of the part varies, minimizing the chance of warping or distortion in the end product.

Moreover, high-temperature thermoset materials offer excellent heat resistance and can withstand extreme operating conditions. They are ideal for applications where maintaining its shape is crucial, such as under-the-hood components in the automotive industry, aerospace structures, and electrical insulation parts.

This type of molding is an ideal solution for its ability to mold large, complex parts with minimal knit lines. There is also little degrading of the fibers during the molding process ensuring a durable product. It is a preferred choice for industries that require with high-strength and heat resistance. The molding process allows us to control the forming process, allowing for more accurate and reliable parts. 

While there are other molding techniques, compression molding is ideal for complex and durable parts that fit most applications.