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| Exploration of plastic packaging film selection |
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Practical use of many kinds of plastic film packaging, plastic film used in many, often there is a mutual penetration, an alternative, but the characteristics of a variety of plastic film itself is not negligible. Therefore, the correct selection, application, good plastic packaging film is not easy. This requires the packaging materials industry personnel to understand the plastic packaging film has some of the corresponding basic functions, mainly for the protection of goods, marketing functions, the adaptability of the packaging machinery and other applications specific needs. In addition, it must consider the economic rationality and adaptability to environmental protection.
Packaging materials for product protection is the most important and basic function, it is no exaggeration to say that if the plastic film on the packaging of goods there is no reliable protection, then it lost its value in use as a packaging material. Plastic film for protection of goods are many different products, different packaging, plastic packaging films for the focus of protection is not required to do the same.
Reliable mechanical protection including the prevention of leakage of the package of goods or packaging of goods outside substances into the destruction and pollution. Plastic film directly reflect the mechanical protection performance indicators, mainly the mechanical strength of thin films, such as tensile strength, tear strength, impact strength of falling bodies (tender shock) and anti-puncture strength.
Good welding strength is reliably protected plastic bag of goods necessary conditions. If insufficient weld strength, weld will become the Achilles heel of plastic film bags, plastic bags, leaving the broken weld protective effect of loss of goods. Biaxially oriented polypropylene film with an ordinary good mechanical strength, but due to poor welding performance, so single-oriented polypropylene film is generally not used for the bag. Welding performance plastic film usually weld strength, ie the N/15mm, higher weld strength, said its better welding performance.
The protection of the other features of goods, the most commonly need to consider is the barrier properties and shading performance.
Plastic film barrier properties that prevent oxygen, carbon dioxide, nitrogen and other gases and aromas, water vapor and other substances through the performance, without a clearly defined scope, the more commonly refers to oxygen, carbon dioxide, and nitrogen and other non-polar gas barrier. For many commodities, particularly food products, plastic packaging film barrier properties of the good or bad, is the packaging of goods whether long-term, effective storage of important factors. The packaging of fresh fruits and vegetables require films to have moderate permeability, inhibition of respiration and make the appropriate packaging materials to maintain a certain degree of metabolism without necrosis, thus extending shelf life.
Barrier plastic film, said the most common approach is to use a certain temperature, a certain humidity conditions, the unit area through the film in a certain period of time the amount of a substance to be measured. Plastic film barrier on the aroma, flavor of the material usually sealed with film bag, the aroma through the determination of the time required for film bag (plastic bag placed in the dryer regularly open the check to the original flavor can be perceived time in order to protect the pilgrimage), Paul Hong longer, said the film through the barrier of the aroma as possible. Shading on some product packaging of Health is also very important. Light, particularly ultraviolet light, is some material change color, fading and oxidation deterioration of the important reasons, so need to pay attention to. Shading to light of a given wavelength to be measured, high transmittance, the shading of the poor. Showing the effect of plastic film on the quality of goods and the film itself, the light transmittance, haze, gloss, antistatic, printing and so are closely related, need to attract sufficient attention.
Transmittance and the haze is determined by the visibility and clarity of packaged goods an important indicator of the effect on the relationship between the display of goods is particularly great. Transmittance and haze are expressed as a percentage, the greater the value of transmittance, indicating the transparency of the better films; and greater haze that objects observed through the film the greater the turbidity, the resolution is worse.
Gloss plastic film that when the light reflection by the ability to sample in the direction of normal reflection, the reflected light relative to the standard surface brightness expressed as a percentage. Gloss value greater the brightness the better films.
As we all know, packaging, printing patterns on the publicity for the product, display of results can not be ignored. Roughly speaking, plastic film printing performance is good or bad film in the printing means the need for surface pretreatment before. Antistatic plastic film the size of a direct impact on the cleaning of plastic film bags. Anti-static, and not cleaning; antistatic poor, the easy cleaning. Cleaning will reduce the transparency of plastic film bags, gloss and clarity of printed images, so a good anti-static plastic film of, for durable bags to maintain a good display of results is very important. As expected a good display of results, you should choose a good anti-static properties of the film.
The anti-static plastic film to the surface resistivity or charged, said half-life. Lower surface resistivity, charge, the shorter half-life, suggesting that the better the antistatic properties of the film.
With the continuous improvement of the level of production, automated production line applications are increasingly widespread. When the use of mechanized, high-speed packaging, must attach great importance to the packing machine packaging film adaptation. Of plastic packaging film adaptation of performance packaging machinery, mainly the film smoothness and welding.
Good smoothness in favor of packaging film packing machine moving smoothly and avoid moving it too much and damage due to the resistance. Smoothness of the film by its coefficient of friction to be described. Smaller coefficient of friction, smoothness of the better performance. Here by the thermal welding performance, not only refers to whether the plastic packaging film heat sealing, or heat sealing, the ability to meet the welding strength high enough problems, and often also requires timely sealing plastic packaging film, allowing timely sealing of a large temperature range and the larger heat sealing pressure range. While some films can be heat sealing, and high weld strength can be obtained, but the heat sealing conditions more stringent, not well matched with the use of packaging machinery, which should be sufficient attention.
According to the needs of specific commodities on the packaging film by the special requirements, in essence, more areas are some special requirements, due to a particularity, it is to be introduced separately. Such requirements, including plastic films and the compatibility of the contents, plastic film adaptation of the use of the environment, dielectric properties, health of, and restraint and so on.
Often need to consider is whether the plastic packaging films are the packaging material by corrosion, dissolution or swelling and loss of strength and plastic film is trivial and the packaging material will react to make bags of goods and thus performance degradation or destruction.
Often need to consider is the film resistance to high and low temperature performance, such as refrigeration, especially in frozen food use of plastic packaging films, need to have good low temperature performance; cooking food in plastic packaging films, need to have good high temperature properties.
Easy integration of goods like packaging with static electricity due to the breakdown, and thus the selected type of plastic packaging film must have good antistatic properties, the general control of the surface resistivity of about 108 ohms or less.
When packing food or pharmaceuticals, select plastic packaging films must have good health performance, comply with relevant health standards to ensure that plastic film will not cause pollution of the packaged goods.
When using heat shrink packaging and wrapping packaging, packaging is very important binding force. Therefore, in the selection of these films, the rate of shrinkage, shrinkage stress and elastic recovery rate should be attached to different situations according to product selection. Lack of binding force, packaging (especially packs) is not tight; However, if the binding force is too large, may make the fragile, perishable goods destroyed.
Performance in meeting the requirements of the above premise, when in the selection of plastic packaging films. Try to select a variety of relatively inexpensive, to save packaging costs, reduce product costs and improve competitiveness. Blind pursuit of packaging, "gentrification" will significantly improve the production costs of goods, while the effect for improving the packaging of goods is meaningless, we must be avoided.
Extensive use of plastic packaging materials for industrial and agricultural production and improve living standards and make a positive contribution, but also the survival of the human environment is not a small negative impact on the environment caused great burden. Therefore, in the selection of plastic packaging film, in addition to the above-mentioned principles into account, it should attach great importance to adaptability of plastic film on the issue of environmental protection.
In the selection of plastic film, the first to grasp the characteristics of goods and the basic requirements for packaging, while plastic packaging film should, in particular, is commonly used in plastic packaging film and the main features of the basic properties have a clearer understanding. In order to select the ideal of plastic packaging films
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| Time:2011/3/10 16:26:38 |
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