Important notes when replacing screw head sets

1. What is a screw head set?

        The screw head set for plastic injection molding machine, also known as the one-way valve (Tip set), is an important part in the plastic injection molding machine, helping to guide plastic into the mold to create the product. 

2. Signs to know when to replace the screw head.

– Plastic injection pressure is not guaranteed
– Unstable Cusio
– Cusio = 0
Remove the screw head assembly, measure the outside diameter and check the checkring for wear.

3. Some types of NG screw head sets

– Damage caused by AbrasionMainly due to the glass in the plastic rubbing against the screw head
– Damage caused by corrosive: Due to the properties of plastic and additives, acid vapors are produced during the production process, causing chemical corrosion.
– Damage caused by broke: Screw head assembly with broken missile head or broken parts
– Gây Product NG: Stain, black stain... caused by plastic adhering to the screw head, leading to denaturation and discoloration.

4. Important notes when choosing replacement screw heads.

4.1. Type of plastic and glass percentage (%GF) used:

       The type of plastic will characterize the chemical corrosion resistance, the glass ratio will characterize the abrasion resistance. These two informations need to be fully provided to the screw head manufacturer. With the screw head set produced by ASG, depending on the glass ratio and plastic type, different materials and production technologies will be used to produce quality products at the most competitive prices.

4.2. Maker production and criteria:

•  Maker production: Choosing a reputable and capable supplier is very important. ASG is a manufacturer of screw heads according to Japanese standards, using special alloy steels imported from Germany and Japan. Advanced technologies such as HVOF, PTA, PVD.
• Cost:; Cost is always a concern for factories and is especially important in the current economic downturn. Understanding that, the ASG brand always provides screw head sets at very competitive prices.
• Warranty: Quality products will always have a good warranty policy to give customers more peace of mind. With the ASG brand, the warranty policy is always 1 for 1 exchange within 12 months from the start of use.
• After-sales service: This is a very important but often overlooked point. Imagine you need technical support for a product but the supplier does not have a technical team to support you. ASG has a technical team of experienced engineers, a factory right in Vietnam, which gives it the ability to respond to situations extremely quickly, ensuring production is always smooth.

4.3. Replace the screw head assembly to improve the problem.

• Product color is uneven
  Replace the screw head type for plastic mixing function, making the plastic flow spiral to increase the ability to mix the colored plastic evenly.
• Cylinder is worn but do not want to replace yet
  Make a non-standard size plastic checkring so that the gap between the plastic checkring and the cylinder meets manufacturing standards.
• Production of products with high visual requirements (products in the optical industry…)
  PVD coated screw heads provide excellent anti-stick properties.

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