Extrusion & Post
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COC Bonding Assembly Difficulty
Problem Phenomenon
COC parts have low strength after gluing and easily come apart, printing ink adhesion is poor, aging decay appears after plasma treatment, assembly yield unstable.
Cause Analysis
COC surface energy is low with no polar groups, adhesives and inks are difficult to wet and adhere; activity after surface treatment decays with storage time; improper solvent selection can also induce stress cracking.
Solution
①Plasma or corona treatment before bonding to increase surface energy; ②complete bonding within the limited storage time after treatment; ③choose matched adhesive system and verify; ④avoid strong solvents directly contacting stress areas.
Key Takeaway
COC bonding difficulty originates from low-polarity surface, activation treatment is the standard pre-process; treatment timeliness management is often overlooked; adhesive system needs compatibility verification with the medium environment.
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