The hardness of the coating is one of the important properties that characterize the mechanical strength of the coating. At present, pendulum hardness test methods are commonly used to determine the hardness of automotive coatings. The pendulum hardness can be divided into two types: single pendulum type and double pendulum type. The former measurement value is expressed in seconds, and the latter is expressed as a percentage of glass hardness.
The single pendulum is also known as Koenig and Pessaz pendulum hardness. Most foreign large-scale automotive paint manufacturers use these two hardness testers. The hardness indexes of their automotive coatings, especially topcoats, are often expressed in terms of these two hardnesses, such as Mascus, Storac, and Akzo. The working principle of several pendulum damping tests is basically the same, that is, if the pendulum rod contacting the coating surface oscillates at a certain period, the softer the surface, the faster the attenuation of the pendulum rod attenuates, whereas the slower the attenuation. In general, the Kony Road hardness value is about half of the value of the P. Because the structure, weight, size, swing period and amplitude of various pendulum rods are not the same, the interaction between the pendulum rod and the coating also depends on the elasticity and viscoelasticity of the coating itself. The result of the measurement cannot be established in relation to each other. Therefore, when the pendulum hardness value of the coating is listed in the product standard, the type of the pendulum instrument used must be specified at the same time.
Double swing pendulum hardness tester is commonly used in China. Its result is expressed as the ratio of the damping time of the swing attenuation within the specified swing range to the damping time of the swing attenuation within the same swing angle range on the glass plate. The glass pendulum must be calibrated before the double pendulum hardness tester.
Laser jet printer
Laser jet printer uses software to deflect laser beam and directly burns the surface of the product to be marked by laser at high temperature to form fonts or patterns.
The advantages of laser jet printer are as follows:
1. Reduce production costs, reduce consumables and improve production efficiency.
2. Anti-counterfeiting effect is obvious. Laser code-jet technology can effectively inhibit the counterfeiting of product identification.
3. It is helpful for product tracking record. Laser jet printer can print out the batch date and shift of the product. It can make every product get good tracking performance.
4. Increasing the added value can make the product look better. Promote the brand awareness of products.
5. The equipment is reliable, the laser marking machine has mature industrial design, stable and reliable performance, can work 24 hours continuously, and the laser maintenance-free time is more than 20,000 hours. Temperature adaptability range is wide (5 - 45 C), which is widely used in various industries in the field of production and packaging.
6. Environmental protection and safety. Laser typewriters do not produce any chemicals harmful to human body and environment. It meets GB7247-87 and GB10320-88 standards. It is an environmental-friendly high-tech product.
7. Laser jet printer can print a large amount of data in a very small range. Laser can mark the product material with very fine beam. The printing accuracy is very high, the control is accurate, the content of jet printing is clearly and perfectly interpreted. It has strong market competitiveness, environmental protection and safety, without any corrosiveness, and completely isolates chemistry. Pollution is also a kind of intimate protection for operators, which ensures the cleanliness and tidiness of the production site, reduces the investment in the later period, and reduces noise pollution.
Human beings have reached an unprecedented height in their understanding of environmental protection and effective utilization of resources. It has become the consensus of developed countries and most developing countries, including China, to eliminate the backward equipment and production processes that cause environmental pollution and waste of resources to the greatest extent. Because the dot matrix ink typewriter has four difficult problems: high pollution, high consumables, high failure and high maintenance, which can not be overcome. Especially the chemical pollution caused by dot matrix ink typewriter in use can cause harm to the environment and operators.
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