Unlike mobile phones, bracelets are in long-term contact with the human body, so this material will not cause human allergies. In addition, wearing comfort, durability and antifouling performance are also important indicators of wristband material selection and design.
TPU
By changing the ratio of TPU reaction components, products with different hardness can be obtained, and with the increase of hardness, the products still maintain good elasticity and wear resistance.
Common processing methods of thermoplastic materials can be used for processing, such as injection molding, extrusion and calendering. But it is not easy to demould. At the same time, TPU can be processed with some polymer materials to obtain polymer alloys with complementary properties. Oil-resistant, waterproof and mildew-proof. Good recovery performance. Secondary materials can be recovered100%; Can be quickly combined with PC plastic parts for injection molding.
Occasionally allergic, high-end products generally use medical grade TPU.
silica gel
Hardness range: 60-80A；; ;
Injection molding (liquid silica gel); Oil pressure (solid silica gel) has a long production cycle and low productivity; Secondary materials cannot be recycled; Compound injection molding with PC plastic needs pretreatment;
Thick feel, few styles, easy to be greasy, slightly poor fit, and at the same time, slightly poor material is easy to dust and enter the dust;
Environmental protection, non-toxic, not allergic to the skin;
Thermoplastic silicone rubber (TPSiV)
TPSiV is the first thermoplastic silicone elastomer developed by Dow Corning Company, which is used to vulcanize silicone rubber particles on thermoplastic substrates. Through the surface richness and hydrophobicity of silicone, it not only expands the properties of thermoplastic elastomer and thermoplastic vulcanizate, but also has excellent high temperature resistance, low tensile and compressibility at high temperature, good wear resistance, hydrolysis resistance and chemical resistance (including fuel and oil).
The material has good resilience and is softer than general TPU;
The surface is not easy to absorb dust, not sticky, has good oil resistance and chemical resistance, and is not easy to pollute;
The coating has good performance and excellent adhesion with PC, PC/ABS, ABS, PA, PVC and other thermoplastic engineering plastics. Convenient molding, extrusion, secondary injection molding and secondary injection molding;
Glue reduces friction coefficient and improves wear resistance; The material is ultraviolet resistant and heat resistant;
Compared with TPU, it is not easy to produce burrs and is suitable for thin-walled design and processing;
Injection molding, without secondary processing such as hand oil spraying, can obtain silky touch;
Can carve rich patterns; Can be colored to get colorful products.
Without plasticizer, there will be no "wax precipitation" phenomenon of materials such as TPE and TPU, which will affect health;
Test model
Shore hardness of 30 ~ 90A can be provided, and injection molding can be adopted. Feel comfortable and soft, excellent elasticity, can simulate the soft and smooth effect of skin.
It can be well bonded with PC plastic, and the material can be recycled, which is slightly higher than TPU.
Using special mixing system, the material is not easy to stick to dust and has good pollution resistance. TPE is a non-toxic, tasteless and safe material, which has no allergic effect on human skin. Material selection of high-end smart bracelets.