Laminating machines can be divided into two categories: ready-to-coat laminating machines and pre-coated laminating machines. It is a special equipment used for paper, board, and laminating film. It is pressed by a rubber roller and a heating roller and then combined together to form a paper-plastic integrated product.

Introduction

    Laminating machines can be divided into two categories: ready-to-coat laminating machines and pre-coated laminating machines. It is a special equipment used for paper and film. The ready-to-coat laminating machine includes three parts: gluing, drying, and hot pressing. It has a wide range of applications and stable and reliable processing performance. It is currently a laminating equipment widely used in China. The pre-coated laminating machine has no gluing and drying parts. It is small in size, low in cost, and flexible and easy to operate. It is not only suitable for laminating large quantities of printed matter, but also suitable for laminating small batches of scattered printed matter such as automated desktop office systems. Processing has great development prospects.

Ready-to-coat type

    The operation of this type of equipment includes three parts: gluing, drying, and hot pressing. The operation requirements are relatively high. The advantage is that the quality of the finished product is reliable. Its fatal disadvantage is that gases that affect human health will be produced during the processing of oily glue, so this technology is used in Developed countries such as Europe and the United States have completely banned it. Water-based glue is more environmentally friendly than oil-based glue, and the cost is higher than oil-based glue.

Scope of application:

It is suitable for laminating (laminating) color printing, packaging paper, soft sheets, soft rubber boards, etc. to make the surface bright, colorful and waterproof.

A detailed description:

1. The base, wall panels, etc. are made of cast iron and will never deform, ensuring that their accuracy will not be affected during use and maintenance and replacement of parts.

2. The rubber coating roller and the rubber limit roller are precision made, and the concentricity error of the roller surface is controlled within 0.01mm to ensure uniform glue application and save glue consumption.

3. The thermal composite steel roller is treated with precision mirror surface, and the lamination finished product is of excellent quality.

4. Electronic automatic thermostat.

5. The hydraulic system is uniquely designed, precise and stable.

Equipped with a roll paper feeding device, it can be used for compounding roll materials.

  Water-based and oil-based dual-purpose machines can be customized according to user requirements.

Pre-coated type

This kind of machine lamination is formed in one step, and the consumables used have been coated with glue. During lamination, the glue is melted by heating, and then the film is bonded to the printed matter through pressure. This kind of coating equipment is cheap, easy to operate, and does not produce harmful gases during operation. It is a trend in the development of coating. In today's society that pays increasing attention to environmental protection, it is believed that this technology will one day replace the pre-coated film and become the The main laminating technology in the domestic printing industry. The disadvantage is that this technology is not very mature in China, and there are still some problems to be solved, such as: single-sided film curling (there are single-sided anti-curling machines, but the price is higher), and printed matter with silicone oil is difficult to cover. membrane etc. It is widely used in short-run printing and digital quick printing industries.

Small film laminating machine

That is to say, it is a simple and practical professional laminating machine that can also be used as a plastic sealing machine, a cold laminating machine, and a PVC heat sealer. Strictly speaking, this type of laminating machine is also an upgrade from an internal thermoplastic sealing machine. However, this type of laminating machine solves the fundamental problem of the first type of laminating machine. The price of the laminating machine is between 1,400-1,500 yuan. Because it uses an internal heating rubber roller to press the film, the film is fed up and down, which increases the heating time of the pre-coated film. , and the heating is balanced, so the film produced is smooth and bright, and has the same effect as the film produced by a high-end laminating machine. However, this type of laminating machine only has a heating power of 500W. Although the temperature is adjustable, the speed is fixed and can laminate 0.7-0.8 meters per minute. Suitable for business card lamination, recipe lamination, photo lamination and graphic print lamination, especially for some small printing plants, typing copy shops, business card production houses and photo studios. In order to reduce equipment investment and reduce costs, this type of lamination is chosen. There are more machines. At present, the market prospects of this type of laminating machine are very good. It can be said that this kind of laminating machine is the most cost-effective.

skills 

The pre-coated laminating machine is a special equipment for laminating printed matter with pre-coated plastic. Compared with the ready-to-coat laminating machine, its biggest feature is that there are no glue coating and drying parts. Therefore, this type of laminating machine has a compact structure, small size, low cost, and easy operation.

  Nonferrous metal plate laminating machine

, Product quality and stability are good.

The pre-coated laminating machine consists of four main parts: unwinding of pre-coated plastic film, automatic input of printed matter, lamination in hot press area, and automatic rewinding, as well as mechanical transmission, flattening of pre-coated plastic film, vertical and horizontal slitting, and computer control system and other auxiliary devices.

1. The automatic conveying mechanism of the printed matter input part can ensure that the printed matter does not overlap during transmission and enters the composite part at equal distances. It generally uses pneumatic or friction methods to achieve control. The conveying is accurate and high-precision. It can also be used when compounding small-format printed matter. meet the above requirements.

2. The composite part includes the composite roller group and the calendering roller group. The composite roller group consists of a silicone heated pressure roller and a pressure roller. The hot pressure roller is a hollow roller with a heating device inside. The surface is forged with hard chromium and has been polished and finely ground. The temperature of the hot pressure roller is tracked and sampled by a sensor and corrected by the computer at any time. The adjustment of the composite pressure adopts an eccentric cam mechanism. Continuously adjustable. The calender roller set is basically the same as the composite roller set, which is composed of a chrome-plated pressure roller and a silicone pressure roller, but without a heating device. The main function of the calender roller group is: after the pre-coated plastic film and the printed matter are compounded by the composite roller group, the surface brightness is not high, and then they are squeezed twice by the calender roller group, and the surface brightness and bonding strength are greatly improved.

3. Transmission system The transmission system is driven by a computer-controlled high-power motor. After one-stage gear reduction, it is driven by a three-stage chain drive to drive the movement of the paper feeding mechanism and the rotation of the silicone pressure roller of the composite part and calendering mechanism. The pressure roller group maintains appropriate working pressure under the stepless adjustment of pressure.

4. Computer control system The computer control system uses a microprocessor, and the hardware configuration consists of a motherboard, a digital key board, an optical isolation board, a power board, a stepper motor power drive board, etc.

Lamination process

    The lamination process is a surface processing process after printing. It is also called post-printing overmolding,

    Post-printing lamination or post-printing lamination refers to a product processing technology that uses a laminating machine to cover the surface of the printed product with a layer of 0.012-0.020mm thick transparent plastic film to form a paper-plastic integrated product. The laminating machine is the equipment used to complete the laminating process. Generally speaking, it can be divided into two types: instant coating and pre-coating according to the process used. According to the different film materials, it can be divided into two types: bright film and matte film. The main problems that affect the laminating process are: affecting the health of operators and causing fire hazards; the paper and film materials after lamination are difficult to recycle, which is a waste of resources.

Use craftsmanship

  Laminating machine laminating process refers to the entire process of laminating pictures and photos, including film selection, laminating production, and cutting. It is mainly used for the post-production of advertising pictures and wedding photos. The covered pictures are highly anti-corrosion, waterproof, dust-proof, wrinkle-resistant and UV-resistant, and can produce a strong three-dimensional sense and artistic appeal. The cold laminating machine is the main equipment to complete lamination, and it is also an essential supporting equipment for computer inkjet printers and electrostatic photo machines. Commonly used equipment for lamination include manual cold laminating machines, electric cold laminating machines, self-releasing cold laminating machines and automatic cold and hot laminating machines. There are also transfer equipment.

Effect

1. Cover the picture with a protective film to improve the strength of the picture and the wear resistance of the surface.

  Iron plate laminating machine

2. Isolate the picture from the outside air to prevent deformation and cracking caused by corrosion, moisture, and dryness of corrosive gases in the atmosphere, fading and discoloration caused by rain erosion and ultraviolet radiation, and keep the bright color of the picture lasting. Extend image display life.

3. Paste the picture on the display board or cloth to make a hanging advertising screen.

4. Press a special mask or plate on the picture to form a picture with special artistic effects such as gloss, matte, oil painting, virtual, and three-dimensional.

Classification of coating methods

The laminating process completed with various materials and equipment is divided into several categories according to the temperature and purpose of the raw materials (consumables) used. The following categories are introduced.

Cold mounting: The method of mounting the protective film on the surface of the picture using cold pressing at room temperature is called cold mounting. There are single-sided mounting and double-sided mounting. In terms of operation methods, there are also manual peeling and self-peeling. The cold laminating process has the characteristics of simple operation, good effect and low cost. It is widely used in the post-production of advertising light boxes, engineering drawings and wedding photography.

     Hot laminating: The method of laminating a special hot film on equipment heated to a certain temperature (about 100-180°C) is called hot laminating. It can be divided into single-sided hot laminating and double-sided hot laminating because of its light transmittance. It has good water resistance, good heat resistance and strong hardness, and is suitable for the post-production of advertising images based on lighting or other occasions. However, thermal laminating equipment and consumables are expensive, complex to operate, consume a lot of energy, and are also costly.

Vacuum lamination

    A special vacuum laminating machine is used to evacuate the space between the film and the painting and then set it at a certain temperature to complete the laminating. The operation method is complicated, the cost is high and the picture size is subject to certain limitations, but the mounting quality is very high, the picture texture is strong, and it is suitable for photos.

troubleshooting

1. The machine does not start: the input wire is blocked, the power wire is connected reversely, and the voltage is not enough.

2. Inaccurate temperature measurement: thermocouple, temperature controller. Whether it is installed incorrectly or damaged.

  Temperature Controller

3. The working vacuum level cannot be increased: the air path is blocked, the hand valve or solenoid valve is not closed, the vacuum pump motor belt is loose, and the vacuum meter is damaged.

4. The main power switch tripped: the input wire on the top of the heating box leaked, the distribution box leaked, external wires were placed on the equipment, the motor leaked, etc.

5. The film suction is not in place: insufficient vacuum, air leakage, insufficient temperature, the film is too thin, the workpiece has been pasted other materials, the concave depth of the workpiece exceeds the lifting of the film, the suction time is too short, the film is not pulled up, the distance between the workpiece Too close.

6. The surface of the covered workpiece is folded and not smooth or the corners cannot be wrapped: the film is not straightened, the film quality is not good, the workpiece is not polished well, too much glue is sprayed, and the template under the workpiece is too low. 7. When the suction coating is not reached, the film is pulled downwards: whether the solenoid valve or hand valve is open.

7. Breaking phenomenon: the temperature is too high, the heating time is too long, the film quality is poor, and there is no heating.

8. Bad adhesion occurs

1. The adhesive is improperly selected, the amount of glue applied is improperly set, and the proportion and measurement are incorrect. The type and amount of adhesive should be reselected.

2. The diluent contains alcohol and water that consume the NCO group, so that the hydroxyl group of the main agent does not react. High purity ethyl acetate should be used.

3. There is powder spraying on the surface of the printed matter. Wipe gently with a dry cloth.

4. The ink layer of the printed matter is too thick. The adhesive coating layout should be increased and the pressure

5. The ink layer of the printed matter is not dry or not completely dry. It should be hot-pressed first before gluing; choose an adhesive with a high solid content; increase the adhesive coating thickness; increase the drying tunnel temperature, etc.

6. The adhesive is absorbed by the printing ink and paper, resulting in insufficient coating amount. The formulation and application volume should be reformulated.

7. The surface treatment of the plastic film is insufficient or exceeds the pot life, causing the treated surface to fail. The plastic film should be replaced.

8. The pressure is low, the vehicle speed is fast, and the temperature is low. The laminating temperature and pressure should be increased and the vehicle speed should be appropriately reduced.

9. Blistering occurs

1. The printing ink layer is not dry. It should be hot-pressed again before gluing; delay the laminating time to allow it to dry completely.

2. The printing ink layer is too thick. The adhesive coating amount should be increased, and the pressure and composite temperature should be increased.

3. The drying temperature is too high and the adhesive surface forms a skin. Drying temperature should be lowered

4. The surface temperature of the composite roller is too high. The composite roller temperature should be lowered.

5. The film is wrinkled or loose, and the film is uneven or curled. The film should be replaced and the tension adjusted.

6. There are dust and impurities on the surface of the film. Should be removed promptly.

7. The adhesive is unevenly coated and the dosage is small. The coating volume and uniformity should be improved.

8. The adhesive concentration is too high, the viscosity is high, and the coating is uneven. Use thinner to reduce adhesive concentration.

10. Film wrinkles

1. The film transfer roller is unbalanced. The transfer rod should be adjusted.

2. The film has inconsistent elasticity or wavy edges at both ends. Qualified films should be replaced.

3. The glue layer is too thick and the solvent evaporates incompletely, which affects the viscosity. When squeezed by the pressure roller, slippage occurs between the paper and the film. The amount of glue applied should be adjusted and the temperature of the drying tunnel should be increased.

4. The two ends of the electric heating roller and the rubber roller are unbalanced, the pressure is inconsistent, and the linear speed is different. Both rollers should be adjusted.

Mechanical principles

Laminating machine usage principle:

(1) Using a ready-to-coat film as a cover can protect the paper. After lamination, the service life of the cover (or printed surface) can be extended, which is especially beneficial for student textbooks, so the usage is increasing. (2) The imprint is not easily damaged. After being coated with the instant coating film, it can increase the color effect and protect the color printed graphics and text without causing them to be worn. This helps publishers' art editors to create various art designs on covers or print surfaces according to their needs, thus promoting an increase in usage.

  (3) That is, the production of coating film is profitable. In lamination, the cost of film production is low, easy to implement, profitable, and companies can benefit.

  The above three points make the coating "hot", but few people pay attention to the quality problems of the coating and its impact on the binding quality. This will be further analyzed below.

  The main problems with the covers and pages after being coated with the ready-to-use film are:

  Surface blistering, wrinkles, uneven bends, falling off and separation, difficulty in storage, etc. These quality problems have not been solved for many years, and there are many reasons for them, such as:

  1. The impact of different paper types.

  2. The effects of different ink colors.

  3. Different impacts of climate.

  4. Influence of environment and conditions.

  5. The impact of enterprises lacking scientific management.

  6. The influence of personnel quality.

Mechanical use

Laminating machine lamination is divided into two categories according to different equipment and processes, one is "instant coating" and the other is "pre-coating"; among them, there are two types: spectroscopic film and sub-film.

Instant coating is a paper-plastic composite process that uses an instant coating machine to immediately apply film along with the glue. It mainly consists of a coating processing plant or processing workshop, which coats the roll plastic film with adhesive as needed, then dries (slightly) composites, pressurizes, and adheres the paper films together to form a film-coated product. That is to say, there are two kinds of coating equipment, automatic and semi-automatic, and their basic working principles are the same; the process flow mainly includes unwinding → gluing and coating → drying → compounding → cutting → accumulation of finished products.

1. Unwind

2. Glue coating

A. Roller reversal type; B. Concave type; C. No-scraper roller extrusion; D. Direct type with scraper.

3. Dry

A. Evaporation; B. Thermalization; C. Solvent removal.

4. Compound

A. Hot pressure roller; B. Rubber pressure roller; C. Pressure adjustment.

5. Printed matter input

6. Recover the accumulation

1.2 Pre-coated film

Pre-coated film is a process that rewinds the plastic film and then laminates it with the paper print. Pre-coating film is made by the pre-coating film processing factory. According to the different specifications and formats used, the glue is first coated and rerolled, and then it is selected by the user factory and then laminated with the printed paper.

The pre-coating film process is mainly pre-gluing → rolling → gluing and coating (hanging type) → solidification and cooling → rewinding → slitting → rewinding → finished product packaging. Pre-coating machine: temperature adjustment → rolling → paper feeding → heating → compounding → cutting → automatic stacking → finished product.

There are three types of pre-coated films: thermal film, pressure-sensitive film and special film. There are two main types of hot film used for binding: BOPP and PET (there is also N nylon).

mechanical function

1. Equipped with a non-stop paper feeding device to ensure continuous production. 2. The use of large-diameter pressing rollers effectively increases the production speed and ensures that the composite products are smooth and bright.

3. Adopt a powder removal mechanism that combines powder sweeping and powder pressing to ensure the powder removal effect. (Configured with powder removal device)

4. The advanced drying tunnel structure ensures that the glue on the film can be dried quickly.

5. The speed-adjustable disc-type rotary cutter ensures paper cutting.