POF (Polyolefin) shrink film is a mainstream packaging material widely used for daily necessities, food, cosmetics, and electronic products. Single-wound (SW) and center-folded (CF) are the two most common types of POF shrink film. To help purchasers select the right film based on actual production needs, this article compares the two types from three core dimensions: product structure, applicable packaging machines, and comprehensive cost, with practical and reliable purchasing guidance.
1. Basic Structural Differences
Single-wound POF shrink film: It is a flat single-layer film with no pre-folding and is tightly wound. It remains flat and single-layered during unwinding, with uniform thickness and smooth surfaces on both sides. The film requires folding and sealing by packaging equipment during use to form lap seals. Under the same roll diameter, the single-wound film features a longer effective length and larger rolling capacity.
Center-folded POF shrink film: It is pre-folded at the center during production to form a double-layer structure, with one fixed folded edge and two open sides. Its built-in sleeve structure greatly simplifies product sleeving procedures. Under the same roll specification, the effective usable length of center-folded film is about half that of single-wound film.
2. Applicable Packaging Machines
Single-wound POF shrink film: It is compatible with high-speed fully automatic continuous packaging production lines, including automatic lap-seal shrink machines, continuous cutting and sealing integrated machines, and other large-scale online packaging equipment. It is ideal for standardized, uninterrupted, and stable mass production scenarios. It is worth noting that the single-wound POF shrink film can also be used in electrostatic sealing packaging equipment, and no waste edges are produced during the packaging process.
Center-folded POF shrink film: It applies to semi-automatic sealing machines, manual packaging equipment, and conventional side-seal shrink machines. The pre-folded design eliminates the need for secondary machine folding, greatly reducing equipment configuration and operational thresholds. It is suitable for small-batch, multi-style, and special-shaped product packaging. Due to limited unwinding efficiency, it cannot support ultra-high-speed continuous production.
3. Comprehensive Cost Analysis
Single-wound POF shrink film: It delivers ultra-low material waste and outstanding overall loss performance.
First, the crease-free single-layer structure ensures uniform shrinkage. It avoids defective goods and rework loss caused by folding marks, wrinkles or incomplete shrinking, and maintains excellent consistent packaging appearance.
Second, it matches automatic packaging equipment for precise cutting and sealing. The seal edges are clean with no extra trimming waste, keeping cutting loss stable and minimal.
Third, the regular roll structure provides longer film length, which reduces roll replacement frequency under the same output and greatly cuts waste from film heads and tails.
The only minor disadvantage is that independent film folding is required on the machine, which generates a small amount of waste during initial commissioning. This issue can be completely avoided once mass production stabilizes.
Center-folded POF shrink film: It features strong practicability and flexible adaptability, making it ideal for medium and small-batch, high-frequency and multi-style packaging production with remarkable advantages.
First, the factory pre-folded structure eliminates on-machine folding and commissioning. It supports immediate start-up production without debugging waste, effectively saving material costs for sampling, trial production and small-batch supplementary orders.
Second, the built-in double-layer sleeve structure greatly lowers operation difficulty for manual and semi-automatic packaging. It allows easy sleeving with high fault tolerance, and is suitable for special-shaped products, combined sets and irregular goods packaging.
Third, it supports fast model and specification switching. For frequent product updates, it improves production changeover efficiency and reduces equipment standby time. Its overall material loss is fully controllable under normal production conditions.
Conclusion
There is no absolute superiority or inferiority between single-wound and center-folded POF shrink film. They are only applicable to different production scenarios. Purchasers can select the suitable film type according to their own equipment configuration, production batch, and packaging precision requirements, so as to achieve an optimal balance of packaging quality, production efficiency, and overall comprehensive cost.
BRJ supports custom single-wound and center-folded POF shrink film tailored to your specific packaging requirements. Contact BRJ today to discuss your customization needs and get professional solutions for optimal packaging performance.