Printing introduction of plastic cosmetic tube

There are three processes in sheet printing of cosmetic tubes. Generally, offset printing is first carried out on aluminum-plastic sheet. The biggest advantage of this sheet is that it can print beautiful patterns and achieve photo-quality effects, which is widely recognized by customers. The other is silk screen, this is the same as the silk screen mentioned in the previous article. Although the silk screen is strong and beautiful, the silk screen can’t print the pattern, only the simple text or LOGO can be printed, and the silk screen has the problem of inaccurate positioning. Text in different colors cannot be too close.

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Material introduction of cosmetic aluminum-plastic tube

There are five main materials for cosmetic aluminum-plastic tubes: ordinary silver sheets, ordinary white sheets, high-gloss sheets (also called high-bright sheets), all-plastic transparent sheets, and fully-shaped white sheets. The five kinds of sheets have their own characteristics. The biggest difference is that the printing effect is different. The common point is that the printing effect is very realistic.

In addition, each material has different thicknesses. The most commonly used thickness specifications for cosmetic packaging are: 250μm, 270μm, 300μm, 330μm, 350μm, 400μm, and materials exceeding 400μm. The production process is very demanding, many manufacturers cannot make it. 350μm materials are commonly found in high-end cosmetic packaging, such as facial cleanser, sunscreen, etc. Sheets below 300 μm are generally found in hand cream tubes, toothpaste tubes, and the like.

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Structure and function of flexible soft tube

A common plastic cosmetic tube can be divided into a tube tail (A), a tube tube (B), a tube shoulder (C), a tube head (D) and a tube cap (E).

Tube tail (A): It can be made according to different market requirements: straight grain tailing, twill tailing, umbrella tailing, star point sealing, special type sealing, and various shapes. Its main purpose is to increase the shelf display effect. , causing consumer attention, thereby enhancing sales competitiveness. The general production date code is also printed at the end of the tube.

Body (B): The body of the tube for containing lotion, cream.

Plastic tube shoulder (C): The joint part of the hose head and the tube should pay attention to the connection space when making the design artwork, generally 3mm.

Tube head (D): Matches the cover with different shapes and different shapes. The discharge hole of the tube head needs attention, and the pore size is generally selected according to the viscosity of the material to reach the most complete use effect. If the fluidity of the material body is very good, it is necessary to appropriately select the discharge hole of the small pore diameter; on the contrary, if the material body of the paste type is to be appropriately selected, the discharge hole with an enlarged pore diameter is appropriately selected.

Tube cap (E): The tube cap has various shapes and is generally divided into a flat head cover, a round head cover, a high cover, a cover, a super flat cover, a double cover, a spherical cover, a lipstick cover, and a plastic cover. On the processing, bronzing, silver, colored cover, transparent, fuel injection, plating, etc., pointed mouth cover. The hose cover is an injection molded product and the tube is a pull tube.

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Nozzle, lotion pump, hand washing pump classification

1, Nozzle: bayonet (half bayonet aluminum, full bayonet aluminum), the screw is plastic, but some are covered with a layer of aluminum cover, a layer of anodized aluminum.

2, lotion pump: divided into vacuum and with dip tube.  A large cover of anodized aluminum can also be placed on the large cover and the head cap of the screw.

3, hand washing pump: the caliber is too large, are screw. A large cover of anodized aluminum can also be placed on the large cover and the head cap of the screw. Generally, the steps are threaded, and the steps are left and right knobs.

Types of plastic bottle packaging

The type of bottle can be divided into
1. Airless bottle: plastic cap, shoulder cover, vacuum pump, piston. Use by air pressure. The nozzles used have a pointed tip (a full-plastic one is covered with an aluminum layer on the outside), and the flat head of the duckbill is covered with a layer of plastic.

2, lotion bottle: overcap, shoulder sleeve, lotion pump, piston. Mostly equipped with a tube inside. Materials are acrylic outside and PP inside. The cover is ABS material normally.

3, cream jar: there are cover, inner bowl, outer bottle and liner.
External acrylic, internal PP material. The cover is a layer of PP gasket added to the ABS inside the acrylic.

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Common material of plastic cap made of

Generally speaking, it is divided into PP and PE.

PP material: It is mostly used for gas beverage bottle cap gasket and bottle cap. It has no heat deformation, high surface strength and good chemical stability. The disadvantage is poor toughness, easy embrittlement under low temperature conditions, and poor oxidation resistance. Wear resistant. This type of bottle cap is mostly used for fruit wine and carbonated beverage bottle cap packaging.
PE materials: mostly used for hot filling caps and aseptic cold-filled caps. This material is non-toxic, has good toughness and impact resistance, is also easy to form film, is resistant to high and low temperature, and has environmental stress cracking performance. Good, the disadvantage is that the molding shrinkage is large and the deformation is severe. Many vegetable oils on the market, sesame oil in glass bottles, etc. are mostly such materials.
Plastic bottle caps are generally divided into gasket type and inner plug type.

The production process is divided into compression molding and injection molding.
The size is mostly: 28mm, 30mm, 38mm, 44mm, 48mmand so on. The number of teeth is divided into: multiples of 9 and 12. The anti-theft ring is divided into 8 buttons and 12 buttons. The structure is mostly: separate connection (also called bridge type) and one-shot type. Uses are generally divided into: gas caps, heat-resistant caps and sterile caps.

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Tin foil VS aluminium foil

Cosmetic seals are generally made of tin foil. But most of the metal components of tin foil are actually aluminum, not tin.

The difference between the two is as follows:

1. Color and physical properties are different:

Tin foil is much brighter than aluminum foil, but the ductility of tin is very poor. The aluminum foil material is relatively stiff, good for cutting, and more uses reel type packaging, the price is cheaper, and now it is gradually becoming the mainstream in the market.

2. Different chemical properties:

The foil is very well insulated and the foil has good finish and heat reflectivity. Aluminum foil paper is a paper obtained by bonding aluminum foil backing paper and aluminum foil paste. Soft and easy to change, like paper, and does not rebound after deformation. Can be qualitative, to ensure that the shading, not falling, opaque, no pollution, the price is cheap.

3. The usage is roughly the same:

Tin foil is mainly used in kitchens for cooking, holding food, or for making materials that can be easily cleaned.

Aluminum foil is used to protect and package food, cosmetics and chemicals.

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What problems should be paid attention to in the printing of aluminum foil self-adhesive labels?

The aluminum foil self-adhesive surface material is a composite material of paper and aluminum foil. Like the metal and plastic surface, the ink is dried only by oxidation, polymerization, volatilization, conjunctiva, and solidification without a permeation process. Therefore, ink drying and blocking are two prominent problems when printing. Aluminum foil paper generally has a surface coating, there is no ink fastness problem, and a reasonable solution to ink drying problem is the key to aluminum foil printing.
According to the characteristics of aluminum foil paper, the general design principles of printed graphics are:
First, it is based on simple words and symbols, fully displaying the characteristics of metallic colors, instead of metal signs, and more applications on commodities, such as household appliances and daily necessities.
Second, large-area solid printing or negative printing, instead of large-area bronzing processes, such as wine labels, industrial labels. Aluminium foil paper rarely has color-coded printing.
Silver foil paper circle label aluminum foil paper is divided into two printing methods: web and sheet.
1 web printing. Mainly in letterpress printing. Simple patterns and hand-labeled labels can be used to solve the problem of ink drying by cutting the sheets and drying them on the shelves. Large-area patterns and labels requiring automatic labeling should be printed with ink. In the absence of drying, the filming method is generally used to solve the drying problem of the ink.
2 sheetfed printing. Mainly based on offset printing, suitable for large-area, mesh printing. Due to the improper drying of the ink during continuous printing of the sheet, it is easy to cause many quality problems. To ensure normal printing and quality, the following measures should be taken:
Use aluminum foil special inks, such as aluminum foil inks from Suzhou and offset offset paper inks from Tianjin Toyo Ink.
A proper amount of desiccant is added to the ink to increase the drying speed of the ink.
Add alcohol to the dampening solution to reduce the emulsification of moisture and ink to prevent smudging.
Master the amount of paper stacking, generally a single sheet is suitable, and the rack is dried to avoid sticking due to excessive weight of the paper.
Adjust the viscosity and thickness of the ink and add additives according to the actual situation.
Keep the production environment of the printing workshop, the temperature is controlled at about 20 degrees, so that the ink is in the best condition.
The above ink processing method is also suitable for web letterpress printing.