How does stretch film protect goods
Source：How does stretch film protect goodsTime：2022-04-15Visitors：
Today, stretch film has been widely used in China's industrial production. Stretch film is an essential material for protecting goods. It is no exaggeration to say that if the stretch film does not have a reliable protective effect on the packaged goods, it will lose its use value as a packaging material and fail in material selection.
The protective function of stretch film on cargo is varied. Different commodities and different packaging methods have different requirements for the protection function of stretch film. Described here are just some of the main features to consider in general. So what are the details that reflect the excellent protection of the goods by the stretch film?
Reliable mechanical maintenance effects include avoiding cargo damage and contamination caused by leakage of goods in the package or foreign objects entering the package. The functional indicators that directly reflect the mechanical maintenance function of the stretch film are mainly the mechanical strength of the stretch film. The larger the strength value, the better the curing effect, such as tensile strength, tear strength, drop impact strength (drop impact), and puncture resistance.
Good adhesive strength is also necessary for the stretch film to maintain the product reliably. If the adhesive strength is insufficient, the gap will become the fatal defect of the stretch film, and the stretch film will lose its maintenance effect on the goods due to the damaged packaging.
Ordinary bi-axially oriented polypropylene film has good mechanical strength, but bi-axially oriented polypropylene mono-layer film is generally not used for bag making due to its poor adhesion function. When bag making is required, a composite stretched film based on a bi-axially oriented polypropylene film containing a heat-sealing layer (CPP) must be selected.
The adhesive function of stretch film is usually expressed by adhesive strength, namely N/15mm. The higher the adhesive strength, the better the adhesive function.
Among the other functions of commodity maintenance, the isolation function and the shading function are the most needed.
Isolation refers to the effect of stretching the film to avoid oxygen, carbon dioxide, nitrogen, and other gases and aroma, water vapor, and other substances. When the scope is unclear, it generally refers to the isolation of non-polar gases such as oxygen, carbon dioxide, and nitrogen.
For many commodities, especially food, the thermal insulation function of stretch film is an essential factor for the adequate long-term storage of packaged commodities. Different products have different requirements for the insulating function of the stretch film.
The protective function of stretch film on cargo is varied. Different commodities and different packaging methods have different requirements for the protection function of stretch film. Described here are just some of the main features to consider in general. So what are the details that reflect the excellent protection of the goods by the stretch film?
Reliable mechanical maintenance effect
Reliable mechanical maintenance effects include avoiding cargo damage and contamination caused by leakage of goods in the package or foreign objects entering the package. The functional indicators that directly reflect the mechanical maintenance function of the stretch film are mainly the mechanical strength of the stretch film. The larger the strength value, the better the curing effect, such as tensile strength, tear strength, drop impact strength (drop impact), and puncture resistance.
Adhesion strength
Good adhesive strength is also necessary for the stretch film to maintain the product reliably. If the adhesive strength is insufficient, the gap will become the fatal defect of the stretch film, and the stretch film will lose its maintenance effect on the goods due to the damaged packaging.
Ordinary bi-axially oriented polypropylene film has good mechanical strength, but bi-axially oriented polypropylene mono-layer film is generally not used for bag making due to its poor adhesion function. When bag making is required, a composite stretched film based on a bi-axially oriented polypropylene film containing a heat-sealing layer (CPP) must be selected.
The adhesive function of stretch film is usually expressed by adhesive strength, namely N/15mm. The higher the adhesive strength, the better the adhesive function.
Other features
Among the other functions of commodity maintenance, the isolation function and the shading function are the most needed.
Isolation refers to the effect of stretching the film to avoid oxygen, carbon dioxide, nitrogen, and other gases and aroma, water vapor, and other substances. When the scope is unclear, it generally refers to the isolation of non-polar gases such as oxygen, carbon dioxide, and nitrogen.
For many commodities, especially food, the thermal insulation function of stretch film is an essential factor for the adequate long-term storage of packaged commodities. Different products have different requirements for the insulating function of the stretch film.
Conclusion
The shading property of stretch film is also significant for packaging some commodities. Photo-oxidation of certain substances that light, incredibly ultraviolet light, is an important cause of discoloration and fading. Which should pay attention to the light transmittance measures the light-shielding property at a given wavelength is high in light transmittance and poor in the light-shielding propertyRecommended Products
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