1, Injection molding

Injection molding is the primary process in cosmetic packaging materials. For plastic parts such as pump heads, momentum, lipstick tubes, and bottle caps in cosmetic packaging materials, the first process is often injection molding, which directly determines product quality and production capacity. He has formed an injection molding system with molds, workers, raw materials, automation, etc. Below we briefly describe the injection molding process for your reference:

Injection molding, also known as injection molding, is a molding method of injection and molding. The advantages of the injection molding method are that the production speed is fast, the efficiency is high, the operation can be automated, there are many varieties of colors, the shape can be from simple to complex, the size can be from large to small, and the size of the product is accurate, the product is easy to replace, and it can be formed into complex shapes. Parts, injection molding is suitable for mass production and complex shape products and other molding processing fields. At a certain temperature, the completely molten plastic material is stirred by a screw, injected into the mold cavity with high pressure, and cooled and solidified to obtain a molded product. This method is suitable for mass production of complex-shaped parts, and is one of the important processing methods.

The injection molding process can be roughly divided into the following 6 stages: mold clamping, glue injection, pressure holding, cooling, mold opening, and product removal. By repeating the above process, products can be produced periodically in batches. The molding of thermosetting plastics and rubber also includes the same process, but the barrel temperature is lower than that of thermoplastics, and the injection pressure is higher. Nowadays, the trend of processing technology is developing in the direction of high-tech, these technologies include: micro-injection, high-fill composite injection, water-assisted injection, mixed use of various special injection molding processes, foam injection, mold technology, simulation technology, etc.

*Categories of plastic materials*

AS: The hardness is not high, it is relatively brittle (there is a crisp sound when tapping), the color is transparent, and the background color is blue, which can be directly contacted with cosmetics and food. In ordinary lotion bottles and vacuum bottles, the bottle body is generally the same. The material can also be made into a small-capacity cream bottle. appear transparent.

ABS: It belongs to engineering plastics, is not environmentally friendly, has high hardness, and cannot be directly contacted with cosmetics and food. In acrylic cosmetic packaging materials, it is generally the material of the inner cover and shoulder cover. The color is yellow or creamy white.

PP and PE: They are environmentally friendly materials that can be directly contacted with cosmetics and food. They are the main materials for filling organic skin care products. The materials are whitish and translucent. According to different molecular structures, three different degrees of softness and hardness can be achieved.

PET: It is an environmentally friendly material and can be directly contacted with cosmetics and food. It is the main material for filling organic skin care products. The PET material is soft and its natural color is transparent.

PCTA and PETG: They are environmentally friendly materials that can be directly contacted with cosmetics and food. They are the main materials for filling organic skin care products. The materials are soft and transparent. PCTA and PETG are soft and easy to scratch. And it is not commonly used for multi-purpose printing.

Acrylic: The material is hard, transparent, and the background color is whitish. In order to maintain a transparent texture, acrylic is often sprayed inside the outer bottle, or colored during injection molding.

2, Surface finishing

Anodized aluminum: aluminum exterior, wrapped with a layer of inner plastic.

Electroplating (UV): The effect is brighter than the spray image.

Spray: The color is matte compared to electroplating.

Frosted: A layer of frosted texture.

Inner bottle and outer spray: It is sprayed on the outside of the inner bottle. There is a clear gap between the outer bottle and the outer bottle. The spray area is small when viewed from the side.

Spraying inside the outer bottle: It is spraying on the inner side of the outer bottle. It looks larger from the outside and smaller in the vertical plane, and there is no gap with the inner bottle.

Brushed gold and silver: It is actually a film. If you look carefully, you can find the gaps in the bottle.

Secondary oxidation: secondary oxidation is performed on the original oxide layer, so that the smooth surface is covered with a matte pattern or the matte surface has a smooth pattern, which is mostly used in the production of logos.

Injection color: Toner is added to the raw material when the product is injection molded. The process is relatively cheap. Bead powder can also be added. Adding too white powder will make the PET transparent color become opaque.

3，Printing process

Silkscreen: After printing, the effect has obvious bumps because it is a layer of ink. The regular bottle (cylindrical type) of silk screen printing can be printed at one time, and the other irregular one is a one-time cost, and the color is also a one-time cost, which is divided into self-drying ink and UV ink. The self-drying ink is easy to fall off for a long time and can be wiped off with alcohol. UV ink has obvious bumps and it is difficult to wipe off.

Hot stamping: It is a thin layer of paper hot stamped on it, so there is no concave and convex feeling of silk screen printing. Hot stamping is best not directly on PE and PP materials. It needs to be hot stamped first and then hot stamped, or good hot stamping paper can also be hot stamped directly.

Water transfer printing: It is an irregular printing process carried out in water, the printed lines are inconsistent, and the price is more expensive.

Thermal transfer printing: Thermal transfer printing is mostly used for products with large quantities and complex printing. It belongs to a layer of film attached to the surface, which is expensive.

Offset printing: It is mostly used for aluminum-plastic hoses and all-plastic hoses. If the offset printing is a colored hose, it must use silk screen printing. The offset printing will have the background color showing through. membrane.

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