In the card printing industry business, with more and more cards are produced, resulting in more and more waste cards.What is more worrying is that today's cards are mostly made of PVC material, which becomes a white pollutant when discarded.Below Seaory will analyze the environmental protection material of the card.
What kind of card is green?This requires that not only the material strength, characteristics, cost and resources should be taken into consideration when selecting the raw materials for the card, but also whether the total cost to the environment caused by the recycling process in manufacturing and use is minimal and conducive to health.Therefore, environmental materials should have one or more of the following four characteristics:
No toxic and harmful substances will be produced after the material is discarded
It can be recycled to avoid single use, thus prolonging the life cycle of the material
Long service life, reduce the frequency of renewal, reduce the demand for limited resources
Materials can be naturally degraded into harmless substances in a short period of time after being discarded.In addition to the environmental protection of the materials, the card manufacturing process also needs to be environmentally friendly.For example, the product processing needs less energy consumption, the processing process does not cause the discharge of toxic and harmful substances and so on.
Currently, there are two types of card raw materials on the market: polyolefin (including PVC, ABS) and polyester (including PC, PET and PETG).The following is a brief introduction of the characteristics of these materials
PVC, polyvinyl chloride, its mechanical properties and electrical insulation good, transparent, difficult to burn, chemical corrosion resistance, low price, is a good comprehensive performance of a class of plastics.The disadvantage is that the thermal stability is poor, easy to decompose the release of hydrogen chloride, must be added to the stabilizer can be processed.It is easy to be brittle at low temperature and is often added with modifier to improve its toughness.Business card printing with PVC also added a certain amount of chloro-vinegar resin to reduce its temperature to improve lamination.
ABS, acrylonitrile - butadiene - styrene copolymer, has the characteristics of tough, hard, rigid.Heat resistance, impact resistance, high surface hardness, size stability, low temperature -40 still has a considerable impact strength.However, its weather resistance, especially uv resistance, is poor, so it is easy to age when used outdoors.Because the softening temperature of ABS itself is higher, more than 90℃, so the business card printing of ABS with a certain proportion of PVC to reduce the softening temperature in order to laminate.
PC, polycarbonate, high light transmittance, low water absorption, impact resistance, good toughness, small creep, product size stability.Good heat and cold resistance.The glass transition temperature (149-150℃) and the thermal deformation temperature (135℃) are both relatively high, and the lamination requires a very high temperature to smooth the lamination.Because the surface of PC card is not easy to be personalized, which greatly limits the application of PC materials in bank cards.
