How is the quality of ABS injection molded parts ensured?

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quality of ABS injection molded parts

The acrylonitrile butadiene styrene (ABS) thermoplastic is an extremely versatile material that has many uses and benefits for various applications. It is a three-monomer polymer, with styrene contributing to the plastic’s glossy appearance and impact resistance while acrylonitrile offers strength and toughness at low temperatures. The balance of these properties makes ABS an excellent choice for injection molding. However, as with all plastics, there are some processing considerations that can impact a project’s outcome. Two such factors, mold shrinkage and water absorption, are important to understand in order to optimize the injection molding process and ensure quality molded parts.

Like many amorphous plastics, abs injection moulding is prone to moisture absorption, particularly at high temperatures. This must be managed, as it can trigger a variety of issues and complications during injection processing. Moisture in the melt can lead to out-gassing, resulting in bubbles or voids on the surface of the finished part. It can also affect the mechanical properties of the plastic, such as its tensile or flexural strength. This can result in brittle or weakened components that do not meet required quality standards and are more difficult to process.

During the injection molding process, ABS has to be melted at higher temperatures than other polymers, and this requires adequate temperature control. Overheating can cause thermal degradation of the ABS resin, reducing its chemical integrity and leading to a reduction in its properties. Typical signs of this are brown or burn marks on the finished injection molded product.

How is the quality of ABS injection molded parts ensured?

To prevent this, injection molders must ensure that the temperature of the molten ABS matches that of the mold and that the residence time is kept to a minimum. A good injection molding machine must be able to precisely control temperature to achieve this.

Injection pressure is also an important factor in ensuring the quality of ABS injection molded parts. Too high an injection pressure can result in jetting, which is a condition where the injected melt shoots through thin areas of the mold at very high speeds, causing flow-related defects and inconsistencies. Moderated injection pressure, on the other hand, allows for better filling of the mold and more precise injection.

With over a decade of experience in metal processing and plastic processing, Firstmold has honed its expertise to perfection. Our team of more than 200 professionals brings a wealth of knowledge to every project, ensuring exceptional quality and precision in every aspect of our work. From design and R&D to production and assembly, Firstmold’s integrated approach guarantees seamless coordination and superior results.

The thickness of the mold walls also plays an important role in the quality of the molded parts. It is essential that the wall thicknesses are uniform, with the ratio of radius to wall thickness not being less than 0.3. This will reduce stress on the deficient wall, and help to avoid the formation of cracks or other defects in the final injection molded product. It is also crucial to avoid using excessively large radius sizes, as this can lead to shrinkage of the polymer, which can create a discrepancy between the initial dimensions of the molded component and its final dimensions. This can make the molded part difficult to handle, and can add to production costs.

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