Wax Seal Adhesive Stickers Wax seal adhesive stickers for paper and film

Wax Seal Adhesive Stickers Wax seal adhesive stickers for paper and film

 

Self-adhesive labels are also called self-adhesive labels, timely stickers, instant stickers, pressure-sensitive paper, etc., which is a composite material made of paper, film or special materials, coated with adhesive on the back and coated with silicon protective paper as the base paper. It becomes a finished product label after processing by printing and die-cutting. When it is applied, it can be attached to the surface of a variety of substrates by simply peeling it from the backing paper and pressing it gently. It can also be automatically labeled by the labeling machine on the production line.

Compared with traditional labels, self-adhesive labels do not need to brush glue, no paste, no dipping water, no pollution, save labeling time, convenient and fast application in various occasions. Labels of different fabrics, adhesives and backing paper can be used on materials that are not suitable for ordinary paper labels.

 

The printing of self-adhesive labels is very different from that of traditional label printing. Self-adhesive labels are usually printed and processed on label linkage machines, with multiple processes completed at one time, such as graphic printing, die-cutting, waste discharge, cutting or rewinding. That is, one end is the input of the whole volume of raw materials, and the other end is the output of finished products. The finished product is divided into sheets or rolls of labels, and the finished product label can be directly applied to the product. Therefore, the printing process of self-adhesive label is more complex, and the requirements for equipment performance and printing staff quality are higher.

 

The basic structure and function of each part of the self-adhesive material. The structure of self-adhesive material from the surface is composed of three parts, namely, surface material, adhesive and bottom paper, but from the perspective of manufacturing process and quality assurance, self-adhesive material is composed of seven parts:

 

1. Surface coating

Used to change the surface characteristics of the face material. Such as improve the surface tension, change the color, increase the protective layer, so that it is better to accept ink and easy to print, to prevent dirt, increase ink adhesion and prevent the purpose of printing text and text off. Surface coating is mainly used for non-absorbent materials, such as aluminum foil, aluminized paper and various film materials.

 

2. The surface material is the surface material. It is the material that accepts the printed text and text on the front, and accepts the adhesive on the back and is finally applied to the paste.

 

Generally speaking, all flexible deformation materials can be used as self-adhesive material fabric, such as commonly used paper, film, composite foil, all kinds of textiles, thin metal sheet and rubber. The type of veneer depends on the final application and printing process. The surface material should be able to adapt to printing and printing, have good inking property, and have enough strength to accept a variety of processing, such as die cutting, waste discharge, slitting, punching and labeling.

 

3. Coat the bottom layer

It is the same as the surface coating, but it is coated on the back of the surface material, the main purpose of coating the bottom is:

 

(1) Protect the surface material to prevent penetration of adhesive.

 

(2) Increase the lightlessness of the fabric;

 

(3) Increase the adhesive force between the same surface material;

 

(4) Prevent the plasticizer in the plastic surface material from penetrating into the adhesive, affecting the adhesive performance, resulting in the reduction of the adhesive force of the label and the label falling off.

 

4. Adhesive

Adhesive is the medium between the label material and the bonding substrate, acting as a bond. According to its characteristics can be divided into permanent and removable two kinds. It comes in a variety of formulations to suit different surfaces and different occasions. Adhesive is the most important component of self-adhesive material technology and the key of label application technology.

 

5, release coating (coated with silicon layer) that is, on the surface of the bottom paper coated with silicone oil layer, coated with silicone oil can make the bottom paper into a very low surface tension, very smooth surface, the role is to prevent the adhesive bond on the bottom paper.

 

6. Backing paper

The role of the backing paper is to accept the release agent coating, protect the adhesive on the back of the surface material, support the surface material, so that it can be die-cut, waste discharge and labeling on the labeling machine.

 

7, back painting or back printing

Backcoat is a protective coating on the back of the backing paper to prevent waste from being drained, rewound after the label around the adhesive bond to the bottom paper. Another is to make multiple layers of labels. The function of back printing is to print the manufacturer's registered trademark or pattern on the back of the backing paper, which plays the role of publicity and anti-counterfeiting.

 

 

There are five types of self-adhesive materials:

 

According to the characteristics of adhesive, it can be divided into permanent adhesive materials and removable adhesive materials;

According to the classification of adhesive coating technology, it can be divided into hot melt adhesive material, solvent adhesive material and emulsion type adhesive material; (Not quite understanding)

According to the adhesive and chemical characteristics of the classification, is divided into rubber base and acrylic two kinds of adhesive materials;

According to the characteristics of the base paper, it is divided into opaque base paper, translucent base paper and transparent base paper three kinds of self-adhesive materials;

According to the characteristics of the surface material, it is divided into paper self-adhesive material, film self-adhesive material and special self-adhesive material.

 

 

Finally, we talk about the specific printing and processing technology of self-adhesive film material label of self-adhesive paper according to the classification of surface materials:

 

1. Printing and processing technology of paper self-adhesive labels

 

1. Printing processing process

Different kinds of materials, different uses of labels, the use of the process is also different. General label printing press is multifunctional equipment, processing plant can be according to customer requirements to develop printing processing technology. The printing and processing process of self-adhesive label is as follows:

 

(1) Unroll

A intermittent: there is no tension change when the web is rolled, so there is no need to adjust. Used in flat pressing, round pressing label machine, unwinding speed is slow. Since this kind of equipment has no paper positioning and correction device, it requires that the end face of web paper is clean to ensure the accuracy of overprinting during printing.

 

B Continuous type: Used in wheel transformation round pressing round label machine. Because when the web diameter speed changes, the paper has tension changes, so this device has tension automatic or manual control mechanism, and web correction and correction device, to ensure smooth paper feeding, ensure the printing quality.

 

(2) bronzing

Flattening: Used in the round flattening, flattening label machine, low speed.

 

Circular press: applied to circular press label press, fast speed, continuous gilding, generally rarely used, generally use gold printing process instead of gilding.

 

(3) Printing

Flattening: Suitable for small area, simple pattern printing, such as price tag, bar code, etc.

 

Round flattening: Suitable for label printing with field, general pattern, simple color mesh printing.

 

Circular press is suitable for all kinds of graphic label printing, especially for high-grade color mesh label printing.

 

UV printing: In the above three printing methods, with UV drying, can print film self-adhesive materials.

 

(4) The first stamping, after printing

In non-UV drying equipment, the use of ordinary ink, the disadvantage is that the printing pattern design is limited.

 

(5) printing first, after bronzing

Applied to the equipment with UV drying device, fast drying ink in the ink stamping, stamping pattern arbitrary design, not limited by ink, suitable for high-grade label printing, is an advanced production process.

 

(6) glazing

Field light: in the ink surface coated with a layer of gloss oil, the purpose is to protect the ink layer, moisture-proof, waterproof and improve the surface luster, can replace the coating process, using UV drying method.

 

(7) composite film

In paper or film material coating, the purpose is to protect ink, waterproof, moisture-proof, increase the strength of the label, increase the pattern

Three-dimensional sense. Cladding film is divided into backing paper cladding film and no backing paper cladding film, due to the latter low cost, is widely used. According to the requirements of the process, there are two kinds of composite transparent film and matte film, the former is widely used.

 

(8) Punch holes

Not widely used, mainly for computer printed labels. The requirement is to punch positioning driving holes on both sides of the label, or to punch holes in the middle of the label for positioning and driving.

 

(9) die cutting

The die-cutting process of the self-adhesive label is half cut through, that is, only the surface material is cut through and the base paper is retained. It is divided into two processing methods:

 

Such as flat die cutting, suitable for all kinds of label printing press, manual plate making, low cost, short plate making cycle, but low viscosity, suitable for short plate live printing processing. At present domestic label factory almost all adopt flat die cutting mode. The other is circular die cutting, the application of circular pressure round label equipment, fast speed, high viscosity die cutting, suitable for long version of the live, the disadvantage is that the plate cost is large, long cycle. At present, the die - cutting rolls of domestic manufacturers are generally processed abroad.

 

(10) Collect paper

It can be roughly divided into cut paper and folding paper.

 

2. Processing methods of paper self-adhesive labels

 

(1) Sheet of paper

In the printing methods of this kind of self-adhesive material, offset printing accounts for 95%, relief printing accounts for 2%, screen printing accounts for 2%, and computer and printing account for 1%. The self-adhesive label printing of single paper is the same as that of ordinary printing matter. Each process is completed on a single machine. It has low production efficiency, high consumption cost, but good printing quality. If the offset printing process is used, the quality of the label printed by four colors is much better than that of the similar products printed by the label press. However, because the self-adhesive products printed on single sheet paper are in the form of single sheet paper and cannot be rerolled, so such products can only be manually labeled, and can not be automatically labeled on the automatic labeling machine. Single sheet printing is suitable for large area of self adhesive color printing. Such as posters, posters, large area labels, etc., not limited to label products. It can be said that single-sheet self-adhesive printing is an important part of self-adhesive printing industry.

 

(2) Web paper

Web type self-adhesive material printing methods, at present, relief printing accounts for 97%, screen printing accounts for 1%, offset printing accounts for 1%, flexographic printing accounts for 1%.

Because of the web printing process, all the processes are completed in one machine, so the production efficiency is high, the consumption is low, the cost is low. At present, our label printing press is a relief printing form, with fewer functions, only suitable for printing simple color block, line pattern labels, not as good as single sheet offset label in printing quality. However, the label processed by web paper can be rerolled into a roll, which can be applied in automatic labeling machine, bar code printer, electronic scale and other equipment, so as to facilitate automatic production. Web printing self-adhesive label is the mainstream of self-adhesive printing in the world.

 

Two, film type self-adhesive printing processing technology

 

Compared with ordinary paper, film material has many advantages. Film material printing is the future direction of self-adhesive printing. Let's briefly introduce the structural characteristics, printability and post-press processing technology of thin film materials:

1. Structure and characteristics of thin film materials

(1) Structure

The film material has the same structure as the paper material, the only difference is that the surface of the material needs to be treated.

 

(2) Surface characteristics and treatment methods

The principle of ink layer forming pattern on printed matter is penetration, volatilization, conjunctiva, curing. Due to the high density of the film, only volatile ink, conjunctiva. The curing process is permeable, so the surface of the film needs special treatment. The role of surface treatment is to improve the surface tension of the film, so that it is greater than the surface tension of the ink, so as to achieve the correct combination of ink and film materials. There are usually several methods of surface treatment:

 

A Corona treatment: The high voltage charge is discharged to the surface of the film to ultimately achieve the purpose of increasing the surface energy, namely surface tension. Corona treatment is generally carried out in the film manufacturer. Due to the time limit of surface tension, strict detection is required before printing. As a result, some advanced devices have prepress corona processing devices in order to print high-quality film products.

B Printing treatment: chemically alter the surface characteristics of the film to make it suitable for ink printing or ribbon printing.

 

C Surface coating: Chemical substances are used to coat the surface of the film to increase surface tension and change surface characteristics.

 

2. Printing process of film materials

(1) Printing process of thin film materials

The basic printing methods are gravure printing: gravure solvent ink printing and gravure water-based ink printing; Offset: UV offset printing ink printing; Relief printing: divided into ordinary resin ink printing and UV relief printing ink printing; Flexo printing: divided into water-based ink printing, solvent printing and UV printing ink printing; Screen printing: divided into UV ink printing and solvent ink printing; Combined printing: It is divided into four printing methods: relief printing + screen printing, relief printing + flexo printing, flexo printing + screen printing, offset printing + relief printing. The following are several printing methods that are used more:

 

A, ordinary resin ink printing. This is the most commonly used method at present. Because of the drying problem, there are two drying methods: cut the sheet and put it on the shelf to air. This method is long drying time, covers an area of large, easy to rub dirty.

 

Refilm. Will not dry ink package in the film, should pay attention to avoid publishing on the refilm, prevent refilm failure.

 

B, UV ink relief printing. This method has good printing quality and high efficiency. It is the most developed printing technology in China and the most suitable for national conditions. Because domestic relief printing equipment generally does not take UV device, film printing is limited, so equipment update, transformation is a necessary condition for printing film.

 

C, solvent ink flexo printing.

This is the traditional printing method, good quality. Due to the solvent ink surface tension is low, the film surface tension requirements are not as strict as other ink, so the ink layer firmness is strong, the process is relatively simple. But solvents affect environmental protection and harmful to human health, is a printing method that will soon be obsolete.

 

D. Water-based ink flexo printing. This is the most advanced printing method in the world today, with low cost, good quality and no pollution. But the process requirements are strict, film surface tension must be in 40 dyne above, on the ink PH value, viscosity has strict requirements. The technology is a kind of technology vigorously developed in China, but the development is slow due to the limitation of equipment.

 

E, UV ink flexo printing. Characteristics of the same as UV relief printing, high cost, but the film surface tension requirements are relatively not strict. General manufacturers use water-based ink printing, UV glazingway can reduce the cost, increase the printing effect.

 

F, UV ink screen printing. This new process can be single sheet or roll printing, high cost, good quality. Single printing does not have to hang on the shelf, web printing can be carried out at high speed.

 

G, solvent ink screen printing. This is a traditional process. Generally, single sheets are printed by hand, and web materials are printed by coupling machines. More than 95% of single sheet printing, good effect, low cost. But solvent screen printing ink is harmful to human body and pollution of the environment.

 

H, UV offset printing ink. Because the glue uses resin ink, so ordinary offset printing can not print film. Some manufacturers use a single overprint when printing PVC, put on the shelf to dry, and finally the way of film. But because the ink is not easy to dry, easy to rub dirty, so waste, productivity is very low. The use of UV offset printing is to avoid all the above problems, and can print a high level of film products.

 

I, gravure printing. Gravure printing rarely prints self-adhesive, but the printing quality is the best of all printing methods, is a potential printing method. In China, as long as the solution of post-press processing, the existing equipment can print high-quality self-adhesive labels.

 

J. Combined printing, also known as composite printing, is the most advanced printing method in the packaging printing industry in the world at present. According to different pattern design, in the same pattern using several methods of printing, to achieve the best visual effect. Overseas such equipment is very common, our country has two types: Japan's LINTEC SR-520B and SHIKY Company's F-330, the former is relief + silk screen printing, the latter is offset + relief printing.

 

(2) ink drying method

The ink on the film is divided into: oxidation polymerization drying (tree finger ink), volatile conjunctiva drying (solvent ink), evaporative conjunctiva drying (water-based ink) and photocuring drying (UV ink).

 

Drying methods are divided into: hot air drying, electric heating drying (far infrared), UV curing drying.

Requirements for drying: ink fully dry; Does not affect the physical and chemical properties of the film; Does not affect the characteristics of the adhesive; No effect on backing paper.

Methods to improve the effect of ink drying:

A, use additives to improve