Choosing the Right Film Material for Biodegradable Sachet Packing

Sustainability targets are pushing more brands toward biodegradable and compostable sachet packaging. But biodegradable films behave differently on the machine: they have different melting ranges, stiffness and sealing windows. This guide helps you choose the right material for reliable runs on Link automatic sachet machines. Whether you run a new packing machine or an existing line, film choice drives both cost and seal quality.

Key Material Families

• PLA (polylactic acid): compostable under industrial conditions; good clarity but a narrow sealing window
• PBAT blends: flexible and tough, often blended with PLA or starch for better processability
• Starch-based films: cost-effective renewable content, sensitive to humidity
• Paper-laminated compostable films: premium look with a compostable barrier layer

What to Check Before Buying Film

1. Sealing temperature range. Biodegradable films typically seal at lower temperatures and shorter dwell times. Confirm the material’s sealing window fits your machine’s heating system.

2. Moisture sensitivity. Many bio-films absorb humidity, which changes their stiffness and print registration. Store film in dry conditions and check the production room climate.

3. Print and registration. Softer bio-films can stretch under tension; use servo-driven film pull with accurate tension control — standard on Link machines — to keep registration stable.

4. Certification. Verify the film’s compostability certification (industrial or home) and confirm the certificate matches your market claims.

Machine Considerations

Link automatic sachet machines handle a wide range of bio-films with adjustable sealing temperature, pressure and dwell time stored as recipes. A quick trial run on your material is the fastest way to lock in the right settings — Link supports material tests at the factory before your line goes into production.

Contact Link Machinery to test your biodegradable film on our sachet machines.