Injection Molding
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PBT Keycap Application
Problem Phenomenon
High-end keycaps select PBT for wear resistance but '2079851475616104452 shrinks, and shrinkage at the characters is uneven
Cause Analysis
PBT has good wear resistance and is the base material for high-end keycaps; but the large shrinkage rate causes shrinkage at thick-wall areas of the keycap; uneven shrinkage at characters and ribs affects feel and appearance; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Design keycap wall thickness uniformly; ②Optimize holding pressure to control shrinkage; ③Leave allowance precisely according to the shrinkage rate; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The quality of PBT keycaps lies in shrinkage control; only with uniform wall thickness plus precise holding pressure can the wear resistance advantage be perfectly presented; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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