Antiblock Agents for Film Surface Control
Film-to-film adhesion in packaging materials creates significant manufacturing and operational challenges, with surface interactions generating forces up to 0.5 N/cm² at typical processing temperatures of 23-50°C. These blocking forces can lead to feeding failures, reduced production speeds, and quality issues across converting and packaging operations.
The fundamental challenge lies in achieving sufficient surface separation while maintaining essential film properties like transparency, printability, and heat-sealing characteristics.
This page brings together solutions from recent research—including controlled surface roughness modifications using iron powder additives, PTFE-LLDPE sealing layer developments, specialized antistatic coatings, and engineered surface topographies with optimized peak densities. These and other approaches provide practical antiblocking solutions while preserving critical film performance requirements.
1. Packaging Film with Iron Powder-Enhanced Surface Roughness for Anti-Blocking and Oxygen Absorption
TOYO SEIKAN CO LTD, 2024
Packaging film for bags and pouches that has improved anti-blocking properties to prevent sticking and clogging. The film has one surface with a roughness of 1-10 microns due to blending iron powder into the propylene resin. This roughness reduces friction and prevents sticking compared to smooth surfaces. The iron powder also absorbs oxygen to improve barrier properties. The rough surface can be formed by blending iron powder into the resin at 1-40% mass.
2. Packaging Film with Iron Powder-Enhanced Rough Surface for Anti-Blocking and Oxygen Barrier Properties
TOYO SEIKAN CO LTD, 2024
Packaging film with improved anti-blocking properties for preventing sticking and clogging of filled pouches. The film has at least one surface with a roughness in the range of 1.0 to 10 μm. This roughness is achieved by blending iron powder into the propylene-based resin layer forming that surface. The iron powder not only improves anti-blocking but also provides oxygen barrier properties. Blending iron powder into the resin layer forms a rough surface with a small friction coefficient that prevents sticking.
3. Multilayer Polypropylene Film with Differential Copolymer Composition and Anti-Blocking Agent
TOPPAN INC, 2024
Multilayer polypropylene film for packaging applications that balances heat resistance, transparency, and anti-blocking properties. The film has an outer layer with specific proportions of propylene homopolymer and propylene-ethylene random copolymer, along with an anti-blocking agent. This outer layer provides good sealing and anti-blocking. The inner layer has a higher proportion of propylene-ethylene block copolymer and ethylene-propylene elastomer. This inner layer provides heat resistance. The film structure allows retort packaging of food items while maintaining visibility and avoiding blocking issues.
4. Polypropylene Multilayer Film with Specific Layer Composition and Dual-Size Anti-Blocking Particles
TOPPAN PRINTING CO LTD, 2023
Polypropylene multilayer film with improved heat resistance, transparency, and blocking resistance for packaging applications like retort processing. The film has a specific layer structure with a heat-sealing outer layer containing propylene homopolymer and propylene/ethylene random copolymer. The outer layer also contains anti-blocking particles of two sizes, with larger particles at lower concentration. This prevents adhesion without sacrificing transparency. The inner layer has propylene/ethylene block copolymer and ethylene/propylene elastomer for flexibility. The film balances heat resistance, transparency, and blocking resistance for packaging applications like retort processing.
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