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| Analysis on environment friendly cards materials and environment friendly cards |
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In the fabrication area, with the issuing volume increases, was abandoned more and more cards. Even more alarming is that most cards are currently used as a card body of PVC material, this card will be a waste of "white pollution" caused serious harm to the environment. Therefore, an environmentally friendly features of the card will certainly ready to come out.
So what kind of card be considered in environmental protection? This requires not only the card body to consider when selecting materials strength of materials, features, cost and resource factors; should also consider the total in the manufacture and use of recycling process, the burden on the global environment is the smallest, whether it is conducive health. For environmental protection material should have the following four characteristics of a and a number of: 1, long life and reduce the frequency of updates, reducing the limited resources available; 2, can be recycled to avoid a one-time use, thereby extending the material use cycle; 3, after the waste material produced by manual processing is not toxic and hazardous substances; 4, material discarded in the short term after the natural degradation into harmless substances. Remove the material environment, the card's manufacturing process also need environmental protection, such as low power consumption required for processing, the process does not result in the discharge of toxic and hazardous substances.
The system currently on the market there are two types of card material: polyolefin (including PVC, ABS) and polyester (including PC, PET, PETG). The following summarizes the characteristics of these types of materials.
PVC, PVC, its mechanical properties and good electric insulation, transparency, flame resistance, chemical corrosion, low price, good overall performance is a class of plastics. Drawback is poor thermal stability and decompose easily release hydrogen chloride, stabilizer must be added to processing. Low temperature brittle-prone, often adding modifiers to improve its toughness. PVC card system has also joined with a certain amount of chlorine vinegar resin to reduce its Vicat temperature, thereby improving the laminated adaptive.
ABS, acrylonitrile - butadiene - styrene copolymer, a tough, hard, rigid characteristics, heat resistance, impact resistance, surface hardness, dimensional stability, low temperature -40 ℃ still have a considerable impact strength. But its resistance to UV weathering performance is poor in particular, outdoor use easy to aging. As the ABS itself softening temperature higher than 90 ℃, so the ABS system of cards with the incorporation of a certain proportion of PVC in order to reduce the softening temperature for the laminate.
PC, polycarbonate, high transmittance, low water absorption, impact resistance, toughness, creep is small, dimensionally stable product. Good heat resistance and cold resistance. Glass transition temperature (149-150 ℃) and heat distortion temperature (135 ℃) were higher, laminated require a high temperature can be calendar. As the PC card is not easy to do personal surface, which greatly limits the PC material in the bank card in the application.
PET, polyethylene terephthalate, has excellent mechanical properties, high rigidity, hardness, low water absorption, good dimensional stability, toughness, impact resistance, abrasion resistance, creep resistance, chemical resistance good.
PETG, polyethylene terephthalate glycol 1,4 - cyclohexanedicarboxylic methanol ester, popular understanding of the PET by adding 1,4 - cyclohexanedicarboxylic methanol on the modified and be PETG. PETG has a higher hardness, excellent toughness, good low temperature toughness, high transparency, easy processing, coloring ability, aging resistance and chemical resistance, is a new generation of environmentally friendly materials. PETG is mainly embodied in the environmental performance of combustion into water and carbon dioxide generated only. As early as 1988, the Visa credit card organization will PETG kaki material as its credit card green materials. PETG has passed U.S. FDA standards for food contact can be used in food packaging, personal care products packaging, medical equipment and other fields, can also be used in electronic devices packaging. In Europe, the United States, Japan, PETG material widely used in electronic payment and identification documents.
These environmental characteristics of fabrication materials, how to do, according to the environmental characteristics of their materials to make a comparison of environmental characteristics on the following table.
Clearly, PETG is currently the most environmentally friendly system of card material.
Wanda G & environment in line with a strong sense of responsibility, to market a kind of environmentally friendly features of the card. This card from the core layer to the surface layer of thin film substrates are used PETG material, such PETG material also the second generation of identity cards to official materials. The following environmental and cards from the perspective of physical properties of pure PETG pure PVC cards and a detailed comparison of cards.
Table 2 pure PVC cards and more pure PETG card
On the table, PETG card from the processing, use to recycle all PVC cards can not compare with the excellent performance.
To fabrication materials development, the existing material including PETG, including a variety of fabrication materials are made using oil and other chemical materials, non-rapid natural degradation capacity of the waste of such material to go through a long time can completely degrade in nature. Therefore, the plastic made from plant materials has been in the market first emerged, among which corn as raw material polylactic acid (PLA) the most attention.
PLA is corn from corn oil or extracted from the acid made of polyester. PLA terms from the look and feel, with no difference between PVC card material, and its service life with very similar characteristics and print. The material produced during the time the card can save 35% energy, 25% reduction in greenhouse gas emissions, and its natural degradation can be rapid, buried in the soil about three months can be completely degraded, even incineration is not destroyed when produce toxins. Unfortunately, PLA is used to produce large quantities of cards are still some difficulties, but to look at the current pace of technological development, I believe that staff will soon have a card made from corn.
Source: Smart Card Network |
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