Producing LDPE bags from regranulate is a technologically advanced process that requires modern machinery and specialized knowledge. While the final product may seem simple, its preparation involves several stages, with the quality of the raw material and production parameters being crucial.
Below we present a step-by-step guide to professional recycled bag production.
1. Collection and selection of raw materials
Regranulate is most often made from:
- post-consumer waste (bags, courier foils, packaging foils),
- post-production waste,
- construction foils,
- foil on pallets.
Waste is sorted according to:
- color,
- type of material,
- degree of soiling.
The quality of the final product depends on the quality of the selection.
2. Washing and cleaning
The waste is exactly:
- washed,
- degreased,
- dried,
- mechanically cleaned of sand, soil and organic residues.
This is a crucial step – impurities can reduce the quality of the film or cause micro-cracks.
3. Grinding and granulation
Cleaned waste goes to:
- mills,
- extruders,
- pressure filters,
- degassing systems.
Ultimately, it is created LDPE regranulate, i.e. homogeneous granules ready for production.
4. Production of the foil sleeve
The regranulate goes to the extruder, which creates:
- sleeve,
- half-sleeve,
- foil tape.
It is regulated here:
- micronization thickness,
- bag width,
- flexibility.
This is where the heart of the product is made: durable LDPE foil.
5. Welding and perforation
Modern lines allow for:
- sealing bags,
- applying perforations,
- roll forming,
- pruning,
- durability testing.
This step creates the final bag – ready for packaging and shipping.
6. Quality control
Each batch undergoes tests:
- tensile strength,
- puncture resistance,
- tightness,
- weld quality,
- thickness uniformity.
Only batches that meet the standards are delivered to the customer.
Producing bags from regranulate is a demanding process, where the manufacturer's experience and the quality of the production lines are paramount. This is why professionally made recycled LDPE bags can be as strong, and often stronger, than those made from virgin raw materials.
