List of DURACON® POM grades

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8. Mold Design

8.2 Gates

Gate Size:

• Gate depth should be 60-70% of the thickness of the molded part.
• Gate width should be 1 to 1.5 times gate depth (in case of a side gate)
• Shorter gate land is preferable (in case of a side gate)

However, if no quality problems result, a smaller sized gate can be used to improve molding cycle, automation of gate finishing work, etc.

Gate Position:

• Set at the thickest section of the molding.
• Set at the position where appearance of the molding is not affected.
• Do not set at high stress zone if the molding is subjected to a load.
• If weld lines occur, gate position is a factor to consider.

Gate Structure:

Since DURACON® POM does not require a special gate shape, a common gate shape can be used. However, when a pin gate or tunnel gate is employed, improper degating may occur in some shapes. Notes are shown in Fig. 8-4.

Fig. 8-4 Notes on the tunnel gate shape