Anti-block / Slip Masterbatch — Film Blocking Together or Feeding Poorly
1. Problem
Freshly wound film sticks to itself, or converted bags do not open or feed through packaging machines.
2. Symptoms
- Film layers refuse to separate on the roll
- Bags do not open on form-fill-seal lines
- High coefficient of friction (COF) — poor machinability
- Squeaking or grabbing between film layers
3. Investigation (Before Prescribing an Additive)
Before recommending any Masterbatch, work through these checks:
- Distinguish blocking (adhesion between layers) from friction (COF too high).
- Measure current COF — target depends on end-use (bag opening vs pallet wrap needs different values).
- Check current additive package — some films already contain slip or anti-block; adding more can cause bloom or sealing issues.
- Confirm sealing and printing requirements — high slip loading can reduce seal strength and print adhesion.
Not every symptom needs an additive — sometimes the correct answer is a resin change, a process change, or drying. Investigation prevents wasted spend on a Masterbatch that does not fix the true root cause.
4. Candidate Masterbatch Family
Two families are commonly evaluated together: Anti-block Masterbatch (silica, talc, or synthetic anti-blocks) and Slip Masterbatch (erucamide, oleamide). They are often supplied as a combined Masterbatch tuned to the end-use.
This page does not prescribe a specific SKU. Grade selection depends on the RFQ Mini Technical Specification at the bottom.
5. Polymer Considerations
LLDPE and LDPE film are the primary users. PP film often uses different slip chemistries. Recycled resin may already carry legacy additives that shift COF.
6. Application Examples
Common applications where this problem appears:
7. RFQ Mini Technical Specification (9 Fields)
Under Application-First Selling v1.0 and Problem-First Discovery v1.0, an RFQ from this page should include every field below so the supplier can respond without a clarifying round-trip:
- Polymer — grade + MFI
- Indoor / Outdoor service — service environment
- UV exposure — region (kLy/year), hours/day, expected years
- Processing method — film, injection, blow, pipe, sheet, raffia
- Color target — color family + Pantone/RAL if applicable
- Thickness / gauge / wall — µm or mm
- Expected lifetime — months or years
- Regulatory requirements — FDA, EU 10/2011, NSF-61, REACH, RoHS, UL, or industry-specific
Continue Your Path
- Prepare specifications → use the 9-field checklist above
- Submit RFQ → /quote
We do not publish inventory or lead-time claims on knowledge pages. Submit an RFQ with the 9 fields above for a technical response.*