The Difference Between Tubular Bags and Side Seal Bags.

HEVEL TUBULAR BAGS
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Tubular bags are co-extruded in one sole production process in 3 or 5 layers (PA/PA/PE) at very high temperatures.
​HEVEL only produces 3-layer tubular vacuum bags to give less leakage. Length wise extrusion stripes are evident when bags are viewed against the light.

DISADVANTAGES

1. Higher Price.

(Note: With ultra-modern production line, HEVEL tubular bags are as competitive as the laminated side-seal bags)

ADVANTAGES

1. No de-lamination as the layers are welded at high temperatures.
2. Only one bottom seal so less leakages along the shorter seal line. Sealing is done at high pressure and low temperature to avoid burning of the barrier nylon seal line.
3. Less change of folds in customer's seals.
4. Bags are flexible with more stretchable, so less leakages caused by sharp products.
5. The bags are crystal clear after vacuuming.

ADDITIONAL ADVANTAGES WITH HEVEL TUBULAR BAGS

1. An aseptic (sterile) interior by means of an Absolute filer, monitored and certified by Eurofins (Europe Government Test Lab).
2. Bags are produced under ISO 22000 controlled conditions, certified by Lloyds Register Quality Assurance.
3. The raw materials used are of good, consistent quality from reputable international supplier.
4. Co-extruding and bag-making using modern computerized high-tech production lines.
5. 40 years experience in production of vacuum bags and thermo-form films.

2-SIDE, 3-SIDE SEAL BAGS
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A spread of nylon sheet is glued to a Polyethylene film, called lamination. The laminated films are 2 or 3 side sealed to size. When viewed against the light, lamination print can be easily seen.

DISADVANTAGES

1. Layers can become loose (de-lamination especially in deep freezing).
2. More leakages due to longer weak seal line. Seal line has more weak spots as the protective nylon barrier is burnt thin along the inner edges of the seal.
3. Higher change of folding in customer's seal, leading to more leakages.
4. Film is harder and more brittle, causing bones to prick through more easily.
5. Side-seal laminated bags by nature contain a lot of bacteria inside the bag.

Pic (Above) Layers of Bag Delaminate

ADVANTAGES

1. ​It is cheaper.