PET or PEIT (hereinafter referred to as PET), commonly known as polyester resin, is a polycondensate of terephthalic acid and ethylene glycol, and together with PBT, it is collectively referred to as thermoplastic polyester, or saturated polyester. Compared to PBT, PET has higher heat resistance and surface finish.
PET is a milky white or light yellow highly crystalline polymer with a smooth and shiny surface. Its creep resistance, fatigue resistance, abrasion resistance and other characteristics make it have the greatest toughness among thermoplastics. Therefore, when PET needs to be bonded with other materials, due to its extremely smooth surface, if ordinary old-fashioned processes such as grinding and using chemicals are used, not only the product is damaged, but also the efficiency and quality are relatively low.
Fortunately, the problem of difficult bonding of PET materials can be perfectly solved by plasma cleaners.
A medical device company that cooperates with Shenzhen Fangrui Technology Co.,Ltd produces a medical electrode product, the physiotherapy electrode patch, which is connected to the instrument and used after being plugged in. It can promote blood circulation, activate blood and remove blood stasis, and has a certain analgesic effect. At the same time, the electrode physiotherapy sheet will not pierce the skin, which can relieve people’s fear of acupuncture. Some physiotherapy electrode patches can be added with a medium, such as the purified product of traditional Chinese medicine, which can promote the absorption of the drug through the skin.
The main material of this physiotherapy electrode patch is PET, the middle part is the FPC circuit board, and the last process is the bonding of PET and hydrogel. And through the treatment of vacuum plasma cleaning machine GD-10, the hydrophilicity of the product surface can be changed, the adhesion force can be increased, and the hydrogel can be bonded to PET. The basic working principle is that the plasma cleaning machine uses a vacuum pump to evacuate the cavity to reach a low vacuum degree in a vacuum state, and then under the action of a high-frequency generator, the gas is ionized to form plasma to treat the surface of the product.
The distinguishing feature of the plasma state is the high uniformity of the glow discharge, which emits visible light in colors ranging from blue to deep violet depending on the gas. These highly active microparticles interact with the treated surface for surface modification, resulting in greatly improved hydrophilicity and adhesion.
In order to better demonstrate the effect of vacuum plasma cleaning machine, we prepared two experimental groups, one is PET products cleaned by vacuum plasma cleaning machine, and the other group is PET products treated by old-fashioned process. Three products were treated in each group, and the bonding effects of different production processes under the same conditions were compared. Our experiments have verified that the PET cleaned by the vacuum plasma cleaner is much stronger than the PET produced by the old-fashioned process. And in the cleaning process, the low-temperature plasma contacts the circuit board above the PET, and the surface circuit is not damaged, and there is no deformation and discoloration.
Since this medical electrode product needs to be used on the human body, we then bonded the PET and hydrogel cleaned by the plasma cleaning machine to the human body for testing. After fifteen minutes of application, when the product was uncovered again, the hydrogel was still firmly adhered to the PET and no hydrogel remained on the skin. Therefore, the verification results show that the bonding effect of the product processed by the vacuum plasma cleaner meets the inspection standard. The plasma cleaner for PET materials slove the problem successfully.
Introduction of Vacuum Plasma Cleaner
GD-10 series vacuum plasma cleaning machine is a three-layer electrode plate structure design, the area of the reaction electrode is 3 layers, and the single-layer area is 175×185 (W×D)mm (can be customized). It is equipped with imported touch screen panel control, which can be divided into two operation modes: automatic and manual. The operation is simple, convenient and fast, not only high efficiency and quality, but also environmental protection and energy saving.
The vacuum plasma cleaning machine is positioned for small-scale production and scientific experiments in universities and colleges, and is widely used in electronics, solar energy, automobiles, textiles, packaging and printing, biomedical and general industries. It is characterized by high processing efficiency, good repeatability and stability, convenient operation, diverse process parameters, performing various tasks, and is suitable for cleaning, activation, etching processes. We can also customize professional, efficient and stable solutions according to different needs of customers.
