Blown film machines are common in packaging, but food processing has stricter hygiene and precision requirements. For food contact inner films and moisture barrier liners, two alternatives fit better than standard industrial blown film machines: food-grade cast film lines and small multi-layer co-extrusion blown film machines.
Food-Grade Cast Film Lines: The First Choice
Hygiene Compliance
Food-contact film layers meet GB 4806.7-2016, the standard for food contact plastic materials and products. Cast film avoids the hygiene risks of die build-up and static attraction that can occur in blown film processes.
Performance Advantages
Thickness tolerance can be held to ±0.005 mm, compared with ±0.02 mm for conventional blown film machines. This precision suits high-quality printing and lamination for food packaging.
Where It Fits
This type is suitable for volume production of inner films for dairy products and snack foods, oil-resistant moisture barrier liners, and similar applications.
Small Multi-Layer Co-Extrusion Blown Film Machines: The Second Choice
Suitable Scenarios
These machines fit small food plants doing multi-category, small-batch trial production. They combine blown film capability with food-grade compliance.
Limits
Layer count is limited to 3 or fewer. An inline material cleaning unit is needed to control hygiene. Output is 20 to 25 percent lower than a cast film line.
Matching the Alternative to Production Scale
Output of 500 Tons per Year or More
Choose a food-grade cast film line. Production efficiency is 15 to 20 percent higher than a conventional blown film machine.
Output of 200 Tons per Year or Less
Choose a small multi-layer co-extrusion blown film machine. No additional workshop modification is required.
Special Food Packaging
For high-barrier or retort-resistant packaging, a multi-layer co-extrusion cast film line is required. Cast film gives better interlayer bonding in barrier structures than blown film.
Safety and Compliance Requirements
Equipment Inspection
Inspect rollers and dies for hygiene level every quarter. Remove any residual food oil or buildup.
Operator Certification
Operators must hold a special operation certificate for mechanical work. Only qualified personnel may adjust film thickness, line speed, and similar parameters.
Maintenance and Replacement Parts
Regular maintenance should cover rollers, dies, cooling units, and winding components. Worn rollers or damaged dies affect film thickness and surface quality. When replacement parts are needed, Hansheng Automation can machine rollers, dies, and other non-standard components to customer drawings.
Our precision custom machining capability is not limited to film production equipment. Hansheng Automation also produces parts for filling machinery, tobacco packaging machinery, and medical devices, along with precision components for yachts and RC cars. From single parts to small batch runs, we machine to customer drawings and deliver parts for assembly.
