Main Technical Parameters
Built around a single-screw extrusion system, this blown film machine adds a rotary die head to improve how normal die-related thickness variation is distributed around the film tube. Instead of allowing a thicker or thinner section to remain in one fixed line, die rotation changes its position continuously, helping reduce localized buildup when the film is flattened and wound.
During production, the screw plasticizes the selected resin and delivers a steady melt to the circular die. The emerging tube is inflated, cooled and guided through an adjustable stabilizing section. A wooden-slat collapsing frame then brings the bubble into a flat tubular web before it reaches the upper nip rollers. From there, the film travels downward to the winding section.
Subject to the confirmed screw and die configuration, the machine can be prepared for compatible polyethylene grades used in shopping bags, refuse sacks, produce bags, liners and general packaging film.
The rotary die supports more even roll formation, but it does not replace correct die adjustment, temperature control or stable cooling. Resin range, rotation speed, film width, thickness tolerance and output must be confirmed for the ordered model.
Product Features
Rotary Die Head
Our rotating die slowly oscillates the die head during film extrusion, distributing thickness variations across the roll instead of allowing them to accumulate in one position. This helps reduce gauge bands and uneven winding, producing flatter rolls and supporting smoother printing, slitting, and bag-making operations with better production stability.
Winding Unit
The surface winding unit uses guide and contact rollers to maintain stable film tension and smooth roll formation. Its compact structure ensures consistent film feeding, reduces wrinkles and edge misalignment
A-Frame
The adjustable collapsing frame gradually flattens the inflated film bubble before it enters the nip rollers. Its stable guide structure supports smooth film travel, reduces wrinkles and misalignment, and helps maintain consistent layflat width, providing reliable film feeding for winding and subsequent printing, slitting, or bag-making processes.
Applications
- Film for shopping bags and gusseted bags
- Packaging film for flat pouches
- Film for trash bags
- Colored packaging film
Our Service
Pre-sales Consultation
Our experienced sales staff understand your production needs and then work with engineers to provide machine recommendations.
Customized Solutions
We provide machine recommendations based on customer needs, offering customized solutions to address pain points, meet various production requirements, and help customers enter the industry.
Installation & Training
We have a professional engineering team that can train your engineers and also install machines in your country.
Quality Assurance
Each blown film machine undergoes commissioning and testing after assembly to ensure stable production of high-quality films, and we send commissioning videos to customers.
Technical Support
Our sales and technical teams are available 25/7 to provide technical troubleshooting and remote guidance to your factory, minimizing downtime.
One-Year Warranty
All machines come with a one-year warranty.
FAQ
Q: 1. What is the purpose of the rotary die head?
A: The rotary die head continuously changes the circumferential position of die-related gauge variation. This can prevent one thick section from repeatedly overlapping at the same position in the flattened film roll.
Q: 2. Does the rotary die make the film completely uniform?
A: No. It helps distribute thickness variation but cannot eliminate problems caused by unsuitable temperature settings, contaminated die lips, unstable extrusion, uneven cooling or incorrect bubble adjustment.
Q: 3. How does this machine differ from a fixed-die mono-layer machine?
A: Both use a single extrusion stream to produce one film layer. The main difference is the rotating die-head arrangement, which helps spread circumferential thickness variation during continuous production.
Q: 4. Which resins may be processed?
A: The line may be configured for appropriate LDPE, LLDPE, HDPE or compatible blends. The actual resin window depends on screw geometry, motor load, heater capacity, die design and the required film specification.
Q: 5. What products can be converted from the film?
A: Depending on the resin and finished-film properties, downstream equipment may convert the tubular film into shopping bags, refuse sacks, produce bags, packaging sleeves, liners or general-purpose flat bags.
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