VACUUM BAGS - SPECIAL FILMS
THE DIFFERENCE BETWEEN SIDE-SEAL BAGS AND TUBULAR BAGS
TUBULAR BAGS
Tubular bags are co-extruded in one sole production process in 3 or 5 layers (PA/PE or PE/PA/PE) at very high temperatures. HEVEL only produces the 3-layer model for vacuum bags. This gives less leakage.
From this tubular film, bags are cut to measure and sealed with one sole bottom-seal. When the bag is held against the light, vertical extrusion-stripes can be seen.
Disadvantages
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Higher price.
Advantages
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No de-lamination.
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Only one seal.
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Less chance of folds.
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The bags are flexible and have more stretch, so less leakage caused by sharp products.
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The bags are clear.
Extra advantages from tubular bags produced by HEVEL:
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An aseptic interior by means of an Absolute filter. The manufacturing process is monitored by Eurofins Food Netherlands B.V.
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The bags are produced under HACCP-controlled conditions. HEVEL is ISO 22000 certified by Lloyds Register Quality Assurance.
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The raw materials used are of good, constant quality.
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Co-extruding ánd bag-making on the most modern, computerized high-tech production lines.
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Long-term experience in the production of vacuum bags and thermo-forming films (since 1975)
SIDE SEAL BAGS
Generally spoken, side-seal bags are made of Polyethelene film, upon which outside Nylon film is sticked. This is called lamination. This flat laminated film is then sealed to measure with 2 or 3 seals. When the bag is held against the light, the lamination print can easily be seen.
Disadvantages
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The ‘sticklayer’ can let loose (de-lamination), especially in the deep-freezer.
The seal is always the weak spot in vacuum bags. The more seals, the more weak spots.
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The chance of folds occuring in the customer’s seal is considerably higher. This leads to more leakage.
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The film is harder, which causes bones to prick through more easily.
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The bags look troubled due to the lamination print.
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Side-seal laminated bags by nature contain a lot of bacteria on the inside.
Advantages
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Low price.