Durability and crack resistance of Custom Cosmetic Plastic Cover: Key factors in material selection and optimized design

1. Importance of plastic material selection for durability and crack resistance
The durability of plastic shells is mainly related to factors such as the type of plastic material selected, thickness, and structural design. Different types of plastics have different mechanical properties, such as hardness, impact resistance, crack resistance, and aging resistance. These properties determine whether the plastic shell can withstand external impact, stretching, compression, or friction during daily use. Commonly used plastic materials include polycarbonate (PC), acrylic acid (PMMA), polypropylene (PP), and acrylonitrile-butadiene-styrene copolymer (ABS), etc. Each material has different advantages and applicable scenarios.

1. Polycarbonate (PC)
Polycarbonate is a very strong plastic material with excellent impact resistance and durability. Its impact strength is 200 times that of ordinary glass, and it is almost not easy to break or crack. Therefore, polycarbonate is very suitable for manufacturing shells that require high durability, especially in the case of anti-fall and anti-collision, the advantages of polycarbonate materials are particularly obvious. It is often used in the shell design of high-end products, such as mobile phones and laptop shells. However, a small disadvantage of polycarbonate is that it is easy to scratch, so additional surface treatment such as coating, sandblasting, etc. may be required during design to increase the scratch resistance of its surface.

2. Acrylic (PMMA)
Acrylic (often called organic glass) is a plastic with extremely high transparency and good weather resistance and UV resistance. However, compared with polycarbonate, acrylic is poor in impact resistance and is prone to breakage or cracking when subjected to large external force impact. Therefore, acrylic is suitable for some application scenarios with high transparency requirements but small external impact, such as transparent cover plates and display boxes of cosmetic shells. In order to enhance the durability of acrylic, it is often chosen to increase the thickness of the material or add structural optimization designs such as reinforcing ribs during design.

3. Polypropylene (PP)
Polypropylene is a plastic with high impact resistance and heat resistance. It is often used in products that require chemical corrosion resistance, high temperature resistance and strong durability. Another notable feature of polypropylene is its good fatigue resistance, which means that it can maintain good shape and strength under repeated stress. Polypropylene plastic shells are usually used in some environments that need to withstand high temperatures, chemicals or high pressures. For example, some special cosmetic packaging may use polypropylene as the shell material to ensure that it can remain intact in a more demanding environment.

4. ABS (Acrylonitrile-Butadiene-Styrene Copolymer)
ABS is an engineering plastic that combines the rigidity of acrylonitrile, the impact resistance of butadiene, and the processability of styrene. ABS has good impact resistance, especially under low temperature conditions, and has good toughness and can effectively resist cracking. ABS is widely used in the manufacture of shells, casings, and external components of electronic products. In customized cosmetic shells, ABS is widely used in scenarios that require good mechanical properties. ABS materials can provide strong scratch resistance and impact resistance, and are suitable for products that need to withstand daily friction, extrusion or falling.

2. Other factors affecting the durability of plastic shells
In addition to the characteristics of the plastic material itself, the design and manufacturing process will also affect the durability of the plastic shell.

1. Thickness
The thickness of the plastic shell directly affects its durability. Thinner shells are easily affected by external forces and crack or break. Therefore, it is necessary to select the appropriate thickness according to the use environment when designing. Generally speaking, for shells that require higher impact resistance, thicker materials are recommended, and the weight and volume of the product should also be taken into consideration.

2. Surface treatment
Surface treatment can significantly improve the scratch resistance and wear resistance of plastic shells. For example, through spraying, coating, laser engraving, etc., the weather resistance, UV resistance, corrosion resistance, etc. of the shell can be enhanced, thereby extending the service life of the product.

3. Structural design
The structural design of the shell is also crucial to its durability. Through reasonable reinforcement ribs, support structures and impact absorption designs, the shell can be made stronger when subjected to external forces and reduce the risk of cracking. For example, some product designs increase the overall impact resistance by increasing the roundness of corners or using a double-layer structure.

4. Environmental adaptability
The durability of the Custom Cosmetic Plastic Cover shell is also closely related to the environment in which it is located. In high temperature, low temperature and high humidity environments, some plastic materials may age, become brittle or deform. Therefore, when selecting materials, in addition to considering their impact resistance, it is also necessary to evaluate their performance in specific environments.

3. How to improve the durability of customized plastic shells
In order to ensure the durability of customized plastic shells, manufacturers usually take a variety of ways to optimize:
Choose suitable materials: According to the use scenario and product requirements, choose the most suitable plastic material. If high impact resistance is required, polycarbonate can be selected; if higher transparency and gloss are required, acrylic can be considered.
Optimize design: The durability of the shell can be improved by increasing the thickness of the shell, adopting a reinforced design or adding a supporting structure.
Increase surface protection: Through coating, sandblasting, laser etching and other methods, the scratch resistance and UV resistance of the shell surface are enhanced to prevent external damage from affecting the durability of the shell.
Environmental adaptability design: Considering different use environments, targeted design of materials and structures is carried out to ensure that the shell can still maintain good performance in extreme environments.