Desiccant Masterbatch — Bubbles, Streaks, or Splay When Processing Regrind or Wet Resin

1. Problem

Regrind or hygroscopic-contaminated resin produces bubbles, silver streaks, or splay marks in the finished part, and drying is not practical or sufficient.

2. Symptoms

• Silver streaks or splay on injection-molded parts
• Bubbles or fisheyes in extruded film
• Surface defects on blow-molded parts running regrind
• Frothing at the die

3. Investigation (Before Prescribing an Additive)

• Confirm root cause is moisture — not shear degradation, contamination, or entrapped air.
• Check whether the resin should be dried instead — desiccant Masterbatch is a scavenger, not a substitute for proper drying of hygroscopic resins like PET, PA, PC.
• Determine regrind %, storage conditions, and ambient humidity.
• Confirm regulatory environment.

4. Candidate Masterbatch Family

One family commonly evaluated is Desiccant Masterbatch — typically calcium-oxide-based scavengers that chemically bind residual moisture during processing. It is not a universal fix for wet plastic; it is appropriate for regrind and moderately damp non-engineering resins. Engineering resins (PET, PA, PC) still require proper drying.

5. Polymer Considerations

Compatible with polyolefins and styrenics. Not intended for hygroscopic engineering resins that require desiccant drying, not desiccant Masterbatch.

7. RFQ Mini Technical Specification (9 Fields)

Under Application-First Selling v1.0 and Problem-First Discovery v1.

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