Can Film Waste Go Directly into a Granulator?
Yes — But Not the Same Way You'd Feed Other Material
Film waste can be processed by a granulator — but the phrase "put it directly in" contains a problem. The way material is typically fed into a standard granulator is almost completely ineffective for film. This is not a machine malfunction; it is the physical characteristics of film making standard feed methods unable to grasp it at all.
Understanding film waste's characteristics is what allows you to judge whether your equipment can handle it, what adjustments are needed, and what special considerations apply.
Three Core Challenges of Granulating Film Waste
Challenge 1: Floating — can't get in
Film has low density and light weight. Fed into a granulator, it tends to float near the feed opening rather than falling by gravity into the granulating chamber. Standard granulators rely on gravity to pull material down, but film floated by the chamber's airflow circles near the feed inlet and simply cannot enter. The larger the film area, the more severe this problem — whole unrolled stretch wrap or large agricultural film is almost completely impossible to gravity-feed.
Challenge 2: Blade tangling — machine stops
Film that enters the chamber without being immediately cut begins wrapping around the rotating blade shaft. As tangling increases, machine load spikes sharply, quickly triggering overload protection and forcing a stop. Manual clearing requires cutting away the tangled film — time-consuming and laborious. Continuous strip film (stretch wrap, film edge trim) has the highest tangling risk because it is inherently a continuous strip that readily wraps around the shaft.
Challenge 3: Low output density — difficult downstream processing
Film granulated output, while reduced in size, still has very low density. This creates problems for both downstream conveying and pelletizing — pneumatic conveying cannot carry low-density particles, and pelletizer feed screws cannot effectively grip light, floating film particles, making feed unstable and pelletizing results poor.
Can a Standard Granulator Handle Film?
Depends on the film form and machine design.
Situations where it can (barely) work: small-area film that has been folded or rolled into a bundle with sufficient weight to fall into the feed opening. For example, small bundled film trim may be processable in a standard granulator — but with low efficiency and still prone to tangling.
Situations where it fails or is largely ineffective: large-area film (agricultural film, stretch wrap, large packaging film) — thin, light, large surface area. Standard granulators essentially cannot achieve effective feeding; material mostly floats at the feed inlet, occasionally a little enters and immediately tangles.
The Correct Approach for Film Waste
Equipment must have a forced-feed design
The most critical equipment requirement for processing film waste is a forced-feed device — most commonly roller-type, where one or more pairs of rollers forcibly press film downward into the granulating chamber, overcoming the floating problem. Equipment without forced-feed cannot effectively process large-area film regardless of operational adjustments. If film is your primary waste type, this design is a mandatory requirement — not optional — when selecting equipment. See: How to Granulate Plastic Film and Flexible Materials for complete equipment selection guidance.
Pre-processing the material before feeding
Cut into short segments: especially for stretch wrap and long strip film — pre-cut into segments no longer than one-third of the feed opening width before feeding. Dramatically reduces tangling risk.
Fold or roll up: fold large-area film into smaller pieces or roll into small rolls to reduce surface area, making it easier for rollers to grip.
Compress into blocks: for large film waste volumes, a film compressor can press material into disc shapes before granulation — both feeding efficiency and granulation effectiveness improve significantly.
Pre-shred: loose or rolled film can be pre-shredded in a shredder before entering the granulator for fine granulation.
Set blade clearance tighter
Film materials require tighter clearance than rigid plastics — typically 0.15–0.25 mm. Too large a clearance and film is pulled and torn rather than cleanly cut, output becomes strips, and tangling risk increases significantly. See: How to Adjust Granulator Blade Clearance.
Notes by Film Type
PE film, PP film: the most common film waste. Equipment with forced-feed can process them. Pre-fold to reduce surface area before feeding for better efficiency.
Stretch wrap: the highest tangling risk of any film type — designed specifically to wrap things, with high elasticity and adhesion. Always pre-cut into short segments or pre-shred before feeding. Never feed a whole roll.
Bubble wrap: extremely low density; volume reduction from granulation is limited; downstream conveying is very difficult. Large quantities of bubble wrap are best compressed with cold-press equipment before granulation.
Agricultural film: typically carries soil and moisture. A basic clean before granulation — or at minimum shaking off surface soil — noticeably extends equipment and blade service life.
Post-Granulation Processing
If granulated film output will go through a pelletizer, the pelletizer must have a forced-feed design to handle the low-density particles effectively. Standard gravity-feed pelletizers process film particles very poorly. If your pelletizer is a general-purpose design, evaluate whether a film-specific model is needed — or sell film particles to a pelletizer with dedicated film equipment.
Related articles: How to Granulate Plastic Film and Flexible Materials — complete film waste processing logic and equipment selection; How to Adjust Granulator Blade Clearance — clearance settings for film materials; How to Match a Granulator with a Pelletizer — film particle pelletizer feed requirements.