Hard cases - Most hard cases are resistant to high temperatures, wear, impact, water, and pressure, so hard cases are more suitable for long-distance travel. They are pressure-resistant (high-end suits for business people) and bump-resistant, and some products on the market are also rainproof and waterproof, making them the best choice for holding fragile items.
Hard-shell suitcases are generally divided into 4 materials:
1. CURV?
CURV? is a patented technology from Germany, which was first used in The suitcases are made of very light materials and have corrugated textures on the surface. Because they are quite lightweight, they are very popular among consumers.
Advantages: low density, good fusion, design studies show that this material can save 50% weight. 100% polypropylene material, 100% polypropylene composite material replaces fiber reinforced materials, which has significant environmental advantages. It does not contain any fiberglass at all, is gentle and easy to handle, non-irritating, has a smooth and wear-resistant surface, and requires no additional coating. It is a thermoformed product with low cost. Can withstand high impact strength and provide maximum protection. It is corrosion-resistant and wear-resistant, easy to clean, and does not require additional surface protection.
2. PC material - polycarbonate
Advantages: High temperature resistance and severe cold resistance from 125 degrees Celsius to -100 degrees Celsius. The box shell is flexible to pressure and can bend, and once the pressure is gone, the box will automatically return to its original shape.
3. Synthetic resin (ABS material)
ABS resin is one of the five major synthetic resins. It has impact resistance, heat resistance, low temperature resistance, chemical resistance and electrical properties. It has excellent performance, easy processing, stable product dimensions, and good surface gloss. It is easy to paint and color, and can also be used for secondary processing such as surface metal spraying, electroplating, welding, hot pressing, and bonding. It is widely used It is a thermoplastic engineering plastic with a wide range of uses in industrial fields such as machinery, automobiles, electronic appliances, instrumentation, textiles and construction.
ABS resin is currently the polymer with the largest output and the most widely used. It organically unifies the various properties of PS, SAN, and BS, and has excellent mechanical properties with balanced toughness, hardness, and rigidity. . ABS is a terpolymer of acrylonitrile, butadiene and styrene. A represents acrylonitrile, B represents butadiene, and S represents styrene.
Advantages: Not affected by water, inorganic salts, alkali and various acids, but soluble in ketones, aldehydes and chlorinated hydrocarbons. It will cause stress cracking when corroded by glacial acetic acid, vegetable oil, etc. . ABS has poor weather resistance and is prone to degradation under the action of ultraviolet light; after being exposed outdoors for half a year, the impact strength drops by half. It has good electrical insulation and is almost unaffected by temperature, humidity and frequency, and can be used in most environments. The impact strength is excellent and can be used at extremely low temperatures; ABS has excellent wear resistance, good dimensional stability, and oil resistance, and can be used for bearings under medium loads and speeds. The appearance of ABS is opaque and ivory-colored granules, and its products can be colored and have high gloss.
4. PP material
Advantages: moisture-proof and pressure-proof. Low transparency, low gloss, low rigidity, but stronger impact strength.