Heavy-Duty Bags: When Do You Need a 3-Layer Film?

Heavy-Duty Bags: When Do You Need a 3-Layer Film?

A heavy-duty sack is defined by its dimensions and material thickness, designed to withstand significant stress during transport, storage, and handling. In industrial applications, these bags typically range from 550 to 1150 mm in width and can reach lengths up to 1500 mm. The film thickness for polyethylene (PE) heavy-duty applications spans from 0.01 to 0.30 mm. When producing these robust sacks, the machinery must maintain high efficiency, with production speeds ranging from 30 to 120 bags per minute to meet industrial demand.

Single Layer vs Multi-Layer

While single-layer films are sufficient for lighter packaging, heavy sacks require enhanced structural integrity to prevent failure. Utilizing 3-layer structures, specifically A/B/A or A/B/C configurations, significantly improves strength and consistency for heavy sacks. This multi-layer approach ensures uniform load distribution and prevents tearing under stress. For applications requiring different materials or specific single-layer outputs, such as circular BOPP production, machinery can handle widths from 50 to 990 mm, achieving speeds up to 240 bags per minute depending on the size. However, for maximum durability in heavy-duty PE sacks, the 3-layer co-extrusion remains the standard.

IBC 3-Layer Capabilities

To produce these advanced 3-layer films, specialized extrusion lines are required. The IBC 3-layer line (SJ-3) is engineered for high-performance output, delivering a maximum output of 500 kg/h. This line accommodates a folded width up to 2600 mm and processes film thicknesses between 0.025 and 0.15 mm. Precision is critical in heavy-duty packaging, and the SJ-3 line maintains a strict thickness tolerance of ≤ ±5%, ensuring every bag meets rigorous quality standards. If you need details regarding specific die head configurations or cooling systems, confirm with our engineers.

Choosing the Bag Machine

Selecting the right bag machine depends entirely on your specific dimensional and throughput requirements. For standard heavy-duty PE bags, you need a machine capable of handling widths from 550 to 1150 mm and lengths up to 1500 mm, processing film from 0.01 to 0.30 mm at speeds of 30 to 120 bags per minute. If your production requires specialized BOPP bags, you must look at circular machines supporting 50 to 990 mm widths at up to 240 bags per minute. For exact integration requirements with your existing facility layout, confirm with our engineers.

Frequently asked questions