With the fast selling mode of cell phones, a large number of cell phone accessories also rose, phone cases, headphones, charging cable, and so on.
Today to explain the silicone, TPU, PC, the three common materials, what is silicone, TPU, PC, processing molding, transparency, flexibility, wear resistance, and later will show a variety of functions of various shapes of cell phone cases.
What is silicone, TPU, PC？
Silicone is a highly active adsorbent material, an amorphous substance, its chemical molecular formula is mSiO2-nH2O; it does not react with any substance except strong alkali and hydrofluoric acid, insoluble in water and any solvent, non-toxic and tasteless, chemically stable.
Advantages: easy to use, dustproof, anti-fingerprint, easy to handle; soft and hard, cell phone silicone cover will have a certain degree of softness to fit and protect the phone; cell phone silicone cover has many kinds, there are many different specifications of the pattern, you can change different cell phone silicone cover every day or regularly to enrich your life. Waterproof.
Disadvantages: In addition to protecting the phone, cell phone silicone covers are relatively easy to get dirty, silicone due to poor breathability, long-term use is likely to lead to the accumulation of heat in the cell phone body, affecting the use of cell phones.
Thermoplastic polyurethane elastomer rubber. Mainly divided into polyester type and polyether type, in daily necessities, sporting goods, toys, decorative materials and other fields are widely used, halogen-free flame retardant TPU can also replace the soft PVC to meet the environmental requirements of more and more fields.
Advantages: wide range of hardness, wear resistance, oil resistance, transparency, good elasticity.
Disadvantages: easy to change sex, easy to turn yellow
PC is short for polycarbonate, referred to as PC engineering plastics, PC material is actually what we call one of the engineering plastics, as a widely used material worldwide, PC has its own characteristics and advantages and disadvantages, PC is a comprehensive performance of amorphous thermoplastic resin, in all corners of your life can see the shadow of PC plastic, large-scale industrial production and easy processing characteristics It is also extremely inexpensive.
Advantages: excellent electrical insulation, elongation, dimensional stability and chemical resistance, high strength, heat resistance and cold resistance, also has the advantages of self-extinguishing, flame retardant, non-toxic, colorable, etc., low price.
Disadvantages: not scratch resistant, not resistant to strong acid, not resistant to strong alkali, not resistant to ultraviolet light
Silicone can not reach full transparency, the most transparent are very hazy like a thick fog kind of feeling.
From the outside, TPU can be made very transparent kind of
The transparency of PC cases is also very good. However, the production process of highly transparent PC protective case is more demanding, and translucent PC cases are still more common.
Processing and Molding
Silicone molding process is vulcanization molding, this process is to use the temperature and pressure of the hydraulic press, with the help of the mold to vulcanize the product molding out.
Single-color cell phone cover, this type of cell phone cover is only the deployment of silicone color, with the shape of the mold to make a three-dimensional plane of silicone cell phone cover, generally need to post-processing, such as screen printing, color printing, digital printing, water transfer printing, thermal transfer printing, laser engraving, oil spraying, etc…
Drip rubber cell phone cover is through the silicone drip rubber process of secondary molding, cell phone cover molding will have a raised difference from the original color of the phone, more than used to highlight the logo, trademark, cartoon image and other multi-color, the product cost is high, the output is not as good as the light body cell phone cover, the single effect of real with a strong sense of color contrast and impact, and therefore the price is higher than the general light body cell phone cover.
TPU belongs to the plastic category, the product is made by injection molding process, that is, a grain of plastic rice is melted by heating, and then shot into the plastic mold with a gun barrel and made products.
Surface treatment: electroplating, spraying, printing, etc…
PC can be injection molded, extruded, molded, blow molded, thermoformed, printed, bonded, coated and machined, the most important processing method is injection molding.
Vacuum plating process: plating on the PC shell, after plating carved some patterns, good texture, but after the vacuum plating to one to UV varnish.
PC spraying process: you can spray hand rubber oil, this feel also has a lot of people like, and then a little more complex is in the colored (transparent red, transparent blue, transparent yellow, etc.) transparent PC shell spray a layer of primer, and then laser engraved some patterns, and finally over a rubber paint, this product looks very high-grade.
PC water transfer, thermal transfer process: do some transfer on the PC shell pattern, and then spray UV varnish, or a soft feel of rubber oil.
After the transfer of the spray UV varnish, hand pinch, the surface of the UV varnish is easier to crack, so the transfer process is best to choose the spray rubber paint, soft feel, matte surface, do a good job of the process, it will also look very high-end. The disadvantage is that the surface is not scratch-resistant, if a local drop of paint, thinning will be along the place where the paint is easily off more and more. The advantage of transfer printing is that the pattern is rich in color.
Silicone material protective cover generally has a soft texture, good tensile strength, and slightly slippery feel
TPU soft and hard qualities between rubber and plastic, TPU hardness range is quite wide, by changing the ratio of each reaction component of TPU, you can get different hardness products, and with the increase of hardness, its products still maintain good elasticity and wear resistance.
A strong thermoplastic resin, PC material impact resistance, strength, and toughness is very good, whether heavy pressure or general drop, as long as you do not try to hit it with a stone, it is long enough to live, while the transparency is also high but its appearance is easier to scratch.
Silicone material protective case is generally thicker quality, using environmentally friendly silicone material, with superb abrasion resistance, there is a better cushioning effect in the collision, not easy to damage the love machine and its appearance.
TPU material is super wear-resistant inside the three materials, excellent wear resistance and resistance to yellowing makes the advantages of this material is very prominent.
PC is easy to scratch, resistant to organic chemicals, poor scratch resistance, and will yellow when exposed to UV light for a long time. Like other resins, PC is easily impregnated by certain organic solvents.