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The physical performance indicators of EVA generally include these several: hardness, specific gravity, elongation, tensile strength, tear strength, compression permanent deformation, and elasticity.
01.hardness
Everyone knows that. The hardness and hardness of the product can be measured using a Shaw hardness gauge. EVA foaming can be from 10 degrees to 80 degrees.
02.Thickness
A lot of people can try to measure it with simple tools. Generally conditional all use microcomputer specific gravity balance. The minimum proportion of my products seems to be about 0.05 (g / cm³).
03.Extensibility
elongation at break. Make EVA foaming products into some specifications, such as 60 * 10 * 5mm, and then use the pull test machine at a constant speed, the length of fracture divided by the original length. Tension strength, simply put, is the load at the time of fracture. And elongation rate synchronization measurement. Tear strength, which I'm really hard to explain. Is to make the EVA piece a small mouth, the two sides of the mouth fixed in the two pliers of the tension test machine, let after to pull. The load received is the tear strength.
04.Compressed permanent deformation
Make the EVA into the specified circle piece and place it in the compression tilt, adjust it to the required parameters, and then place it in the aging machine for several hours. Finally, it is removed to test the thickness of the circle sheet. The value calculated by several coefficients is compression.
05.Elasticity
This is just an abstract name. Say this is called resilience, it seems not comprehensive. If you want to say the image can be called Q sex. Some brands have a more professional name, the elasticity is divided into two parts: buffer and reverse hair. These two words should be well understood. I won't go into it.
Small foaming granulation after too long without the rate will increase, this is not very OK processing. To rely on a reasonable arrangement in the production of production. General raw material is better, park can not exceed a week, the difference must used up within three days, so just won't lead to multiplier increase. Really beyond this period, can return to the furnace to make grain, appropriate add DCP.
For small foaming, some thick places with holes can properly extend the foaming time, or increase the mold temperature, or increase the machine pressure; for formula, DCP can be appropriately increased, or auxiliary bridging agent can be added.
Added excipients to the EVA foaming formulation
01.offcut
Border is made into the product after some redundant material tail, edge and what. They are all over-blistered ones. This kind of things are cost killers, which can greatly reduce production costs, of course, can also bring physical performance impact. Almost all of this kind of EVA doing it is in use, so I will not repeat it.
02.Anstatic agent
Some products are required to have antistatic function, and EVA foaming products themselves are very strong electrostatic, so you need to add some antistatic agent in the formula. The general antistatic agent used in EVA is a mixture, the specific component MS is very complex, I did not know at that time, the dosage is 3% -5%.
03.Fire retardant
EVA foaming products used as certain packaging materials may be flame retardant. Flame retardant can be properly added to the formula to achieve the effect of flame retardant. Plastic commonly used flame retardant Mg (OH) 2, Al (OH) 3, also have a certain effect on EVA foaming products, but the dosage is relatively large, we use 12% -20%, but for the flame retardant requirements of high products, they are not very easy to use.
04.Fast ripening agent
The EVA foaming process takes time. If you want to increase the yield and reduce the energy consumption, the fast ripening agent can be added appropriately to shorten the time needed for foaming. The most common fast ripening agent on the market is TAIC, which should be a bridge aid. Adding a proper amount of TAIC can shorten the time, but as it is added, the size of the product will be reduced, and the reduction effect is not very ideal.
05.Colorant
Foam products are generally colored, so you need to add a colorant to the formula to adjust the color. EVA foaming products color mixing can be used with toner, color glue, of course, it is best to use the color mother particle. MS products can not be computer color, probably because the thing before and after the color changes too much.
With nearly 20 years in the intelligent extrusion equipment industry, he has held key roles at Jwell Machinery, including General Manager and Rotating Chairman. Since 2024, he has managed multiple subsidiaries, driving business expansion and industrial upgrades, while leading innovation in intelligent manufacturing and global growth.
