The weld and sink marks in plastic injection molding may be caused by the easily solidifying surface condition of the mold. Please try surface modification through blasting!
1. Let's increase the gates to address poor filling ⇒ Welds have occurred. Has this ever happened to you? ■ Increase the gates ⇒ The number of resin junction points increases with the number of gates, resulting in welds. By blasting the mold surface, it alleviates visually (the surface becomes matte, making it less noticeable) and expands the range of molding conditions (the fine unevenness reduces heat transfer from the resin to the mold, slowing the growth of the solidification layer, increasing injection pressure, and enhancing transferability, which alleviates weld depth). ◎ Result: Appearance defects are improved. ◎ 2. Adopting pin gates and submarine gates ⇒ Sink marks occur. Has this ever happened to you? ■ Increase the holding pressure setting. ⇒ The gate seal occurs quickly, and the filling density does not increase as desired. By blasting the mold surface, it expands the range of molding conditions (the fine unevenness reduces heat transfer from the resin to the mold, slows the growth of the solidification layer, increases injection pressure, and enhances the filling density of the resin up to the gate seal, which alleviates sink mark levels). ◎ Result: Appearance defects are improved. ◎ 【There might be such advantages!?】 - The range of molding conditions expands, stabilizing productivity - Warping and deformation are reduced - Injection pressure can be reduced
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basic information
【Are there any advantages like this?】 ■ Reduced release resistance ・ Shorter cycle times ・ Reduced draft angles ・ No sticking to the mold 【Are you facing any of these issues?】 ■ Trouble with release defects and cracking ■ Trouble with warping and deformation ■ Trouble with weld lines ■ Trouble with short shots ■ Trouble with sink marks ■ Trouble with voids (bubbles) ■ Trouble with poor gloss ■ Trouble with black spots and residue from release agents ■ Trouble with insufficient resin filling ■ Trouble with surface roughness of molded products ■ Trouble with gas deposits/blockages in vents *For more details, please refer to the PDF document or feel free to contact us.
Price information
*Processing Cost Reference - Processing mold (insert) size: 150mm × 150mm × 80H - Cost: Approximately ¥20,000 - Remarks This is a reference price for cases where a simple mask can be used. The price may vary depending on the masking content, processing area (size, shape), and processing conditions. Thank you for your understanding in advance.
Delivery Time
P3
※The processing status, content, and quantity at the time of your request may vary, so please feel free to contact us.
Applications/Examples of results
For more details, please refer to the PDF document or feel free to contact us.
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Company information
Since the development of cabinet-type equipment in 1957, Fuji Manufacturing has accumulated its technology and achievements as a dedicated manufacturer of sandblasting equipment. Utilizing the sandblasting processing technology and know-how we have built up to this point, we provide various "functional surfaces" to address the diverse issues and challenges in the market. ■ Defects, challenges, and problems in production sites ■ Mold-related issues such as "molding defects" and "yield issues" We have numerous examples of improvements and achievements related to the above content! ⇒ For instance, improvements in "moldability" and "release properties" in plastic molds... Please feel free to consult with us.