Mechanical function of laminating machine

The laminating machine can be divided into two types: instant coating laminating machine and pre-coating laminating machine. It is a special equipment for paper and film. The coating laminating machine includes gluing, drying and hot pressing. The three parts, which have wide application range and stable and reliable processing performance, are widely used in China. Pre-coated laminating machine, without glue and dry parts, small size, low cost, flexible operation, not only suitable for laminating processing of large-volume printed materials, but also suitable for coating of small batches and scattered printed materials such as automated desktop 【 Film Lamination Machine 】 office systems. Processing is very promising.

Mechanical function of laminating machine

1. It has a non-stop paper-feeding device to ensure continuous production;

2. the use of large diameter press roller, effectively improve the production speed, to ensure that the composite products are flat and bright;

3. The powder removing mechanism combined with sweeping powder and powder compaction is used to ensure the powder removing effect. (configure the powder removing device);

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

5. The adjustable rotary disc cutter can ensure the slitting of the paper;

6. The motor adopts frequency conversion control, which is safe and reliable.

Pre-coated Film Lamination is the Developing Trend

In China, I think there are four important reasons for the comprehensive replacement of pre-coated films: The first reason is that after 12 years of development, the whole industry has already recognized the pre-coated film, the pre-coated film is of good quality, and the pre-coated film. Environmental protection, which is recognized by the entire printing industry.

Now everyone knows that the industry is aware of pre-coated film, which is a very important point; the second point is the formation of industrial clusters.【Water Based Lamination Machine 】After 12 years of development, I believe that there are currently 30 manufacturers of pre-coated films in China. The third important factor is the cost reduction due to the improvement of industrial clusters and industrial technology. The original pre-coated film has three sentences, one sentence. It is good quality, one sentence is environmental protection, and one sentence is expensive. Many manufacturers use our products to proof, and do not produce after the completion of the test. Because he costs a lot. But today, the pre-coated film is already not expensive, and the pre-coated film is now flat with the solvent-based water-based film.The reduction in film cost is one reason for the overall replacement of the precoat film. Another important basis is the policy. 【Fully Automatic Lamination Machine 】A series of national policies will play an important role in promoting the development of pre-coated films, especially green printing.

The global market share is like this. According to the statistics of the National Press Center in 2009, the US pre-coated film has reached 95%, Japan has reached 70%, Europe has reached 60%, South Korea has reached 50%, and China in 2009. In April, the pre-coated film only accounted for 10%. China Information Center statistical pre-coating film accounted for 10%, water content accounted for 21%, solvent type accounted for 69%, today the number is greatly reduced, today water includes PUR glue and so on, and today's pre-coated film is not 10% It is also highly developed. This is 2009, because we want authoritative data. 【Automatic Film Laminating Machine 】This standard rose to the national standard in 2010, and it is clear in the standard that there are no contaminated items in the laminating machine. In particular, the signing of the green environmental protection agreement in 2010 will further promote the comprehensive replacement of the pre-coated film.   

Therefore, in order to develop the green and digital development of China's printing, and for the sake of national health, it is necessary to jointly promote the pre-coating film to be a comprehensive replacement for the benefit of the people.

Pre-coated Film Lamination Process

The pre-coating film refers to a process in which a plastic film is sized and re-rolled before being combined with a paper printed product. It is firstly applied to the film by the pre-coated film processing factory according to the size of the specification. The glue is applied to the film for re-rolling, and then combined with the printed matter.The pre-coated film was first used in 1989 and has been widely used in Europe and the United States. It entered Asia around 1996. At the same time as entering Asia, Europe and the United States have announced that it is forbidden to use the film as a pre-coating film.【 Fully Automatic Lamination Machine 】Due to the late use, all the countries in Asia except Japan have used pre-coated films, and other countries (such as China, South Korea, etc.) are in the state of pre-coating and film coating. China has only used pre-coated films since 2000, and the market share of pre-coated films in China is still small.


Pre-coated films have many advantages over instant coatings. If the pollution is reduced, there is no damage to the human body; the quality of the film will not be affected by the different properties of the paper or the color of the ink; the pre-coating film laminating machine is simpler to operate, and the processed image is better; the wrinkles are basically eliminated. , bubbles, shedding and other phenomena. Most notably, this is an environmentally friendly process, and the entire production process is harmless to the human body. 【 Laminating Machine Supplier 】 However, the promotion of pre-coated film in China is still relatively slow. Among them, the cost issue is a big influential factor, which determines the enthusiasm of investors for the pre-coating process. In a recent survey, more than half of the respondents believe that pre-coated products are expensive in terms of price, because pre-coated products are printing consumables, and the cost of printing is a non-negligible problem for printers when selecting consumables. 


In addition, due to the lack of paper and film separation technology in China, pre-coated films cannot be completely called an environmentally friendly process in China. In response to this situation, pre-coated products should reduce costs through mass production, so that market prices are getting closer to the needs of printers. At the same time, the research and development or introduction of the paper membrane separation technology should also attract the attention of relevant departments, in order to achieve environmentally friendly coating and rational development of the laminating process without being able to discard the laminating process. 【 Film Lamination Machine 】It is a brand-new transfer technology that can cope with complex work pieces and is suitable for different materials. It also greatly increases the added value of products due to vivid patterns and vivid colors. This technology is a special chemical treatment film, after printing a certain color pattern, it is sent to the surface of the water, using water pressure to write the pattern evenly on the surface of the product, while the coated film is automatically dissolved, washed and baked. After drying, a layer of transparent protective coating is applied, and the product has a completely different visual effect.

Film Lamination and UV Coating

The printing technology continues to advance, the printing materials are constantly updated, the influence of various post-press processing conditions on the film is increasing, the printing quality standards and market demand are constantly increasing, which requires the film industry to change according to objective conditions. New quality technical standards for structural adjustment. At the same time, we should also look for other processes that can replace the film in time to reduce the pressure on the environment.【Thermal Lamination Machine 】In fact, in addition to the film coating process, UV glazing can also play a certain role in protecting and decorating the surface of the printed matter. The two are similar in many functions. Due to the relatively low cost of UV glazing, the development is relatively rapid, and the product is very attractive, so it also has a certain market share in some post-press processing fields. Some people who are optimistic about UV glazing technology even believe that this technology can be independently developed instead of laminating technology. In fact, this is just a wish of people. According to some printing companies that use UV glazing technology, UV glazing applications are mostly partial glazing. Local UV glazing can improve the grade of books, but in most cases, this partial UV glazing process is also This is done after the film is applied, and the previous film coating process must be a solvent-based film.


In addition, there is still a lot of deficiencies in UV glazing compared to film coating. Such as UV glazing protection, folding resistance, wear resistance, etc. are not as good as the film, there are limitations in many areas, 【 Film Lamination Machine 】such as packaging boxes; UV glazing also needs to put into printing equipment and UV curing equipment, and the film has Off-the-shelf equipment foundation and mature technology; in addition, some UV varnish will also volatilize odor during the coating process, which will affect the operator.Today's printing houses and publishing houses pay great attention to this process, and believe that UV glazing can replace the laminating process in book printing. But in general, UV glazing is still limited in many aspects, there are still many problems in the process, and it is impossible to completely replace the laminating process.

Instant Water-based Film Laminating Machine

Characteristics of instant coated products

Thermal Lamination Machine

(1) It is prone to foaming and film detachment. In large-area solid printing or high humidity working environment, foaming and film removal are particularly serious.
(2) The surface of the product often produces bright spots or fog points with different gloss.
(3) The product is prone to curling. If the pressure is too high when the glue is applied or the temperature is too high during drying, 【 Manual Lamination Machine 】 the curling phenomenon is more serious.
(4) Chemical substances such as organic solvents will volatilize into the atmosphere during filming, causing environmental pollution and even causing fires.


Characteristics of pre-coated film products
(1) The film-forming product using the molten pre-coating film does not exhibit foaming and film peeling, and the product has a long service life.
(2) The film-coated product using the solvent-evaporable pre-coating film may have a large thickness in the printing ink layer, where the folding, die-cutting, and indentation pressures are relatively large, or in a high-temperature environment, the film may be released and foamed. phenomenon.
(3) The solvent-evaporable pre-coating film easily adheres to impurities such as dust during production, 【Film Lamination Machine 】thereby affecting the surface effect of the film-coated product.
(4) The film product is basically free from curling.
It can be seen from the above that the pre-coating film coating process, especially the molten pre-coating film coating process has the advantage that the coating film coating process cannot match, and is an inevitable choice for the future film coating industry.

Basic Knowledge for Thermal Film Laminating Machine

The pre-coating film lamination is less polluted than the instant coating film lamination and has no harm to the human body. There is no difference in the nature of the paper and it affects the quality. There is no difference in ink color and it affects the filming effect. There is no effect of using adhesives with vinyl binding. The pre-coated film laminating machine is easy to handle and easy to process.【 Thermal Laminator 】The processed graphics are more beautiful and have a good effect. Basically eliminate wrinkles, bubbles, shedding and so on. It has a wide range of applications and can be used for film processing other than printing.


The pre-coating film refers to a process in which a plastic film is sized and re-rolled before being combined with a paper printed product. It is firstly applied to the film by the pre-coated film processing factory according to the size of the specification. The glue is applied to the film for re-rolling, and then combined with the printed matter.【 Lamination Machine Manufacturer 】The film, that is, the film, is a processing technique in which a plastic film is coated with a binder and the paper print is heated and pressurized to bond it together to form a paper-plastic product. The film-coated printed matter has a thin and transparent plastic film on the surface, and the surface is smoother and brighter, thereby improving the gloss and fastness of the printed matter. The color of the graphic is more vivid, three-dimensional, and waterproof. Anti-fouling, abrasion resistance, folding resistance, chemical corrosion resistance, etc.


The pre-coated film is composed of a substrate and a binder layer, and the substrate is usually a polyester (PET) film and a biaxially oriented polypropylene (BOPP) film. BOPP film has the characteristics of high transparency, good brightness, non-toxic and tasteless, water resistance, heat resistance, low cost and soft texture. It is an ideal material in the film coating process, and its thickness is about 12-20um. Therefore, the material cost From the perspective of processing technology, most of the pre-coated film substrates use BOPP film.【Best Thermal Laminator Machine 】The adhesive layer of the pre-coated film has two types of melt type and solvent volatilization type. According to different processing equipment and process conditions, adhesive layers of different thicknesses are selected, and the thickness of the adhesive layer is generally between 5-15 um. At present, the adhesive layer of the domestic pre-coated film is mainly composed of hot melt adhesive or organic polymer low temperature resin. Hot melt adhesive is made by blending and modifying several main materials such as main adhesive resin, tackifier and conditioner. The organic polymer resin is a single polymer low temperature copolymer. Since the hot melt adhesive is a mixture of several materials, the transparency after coating is significantly lower than that of the low temperature pure resin type pre-coated.


The production process of the solvent volatilization type pre-coated film is similar to the film coating process, and the colloid is dissolved in an organic solvent and then coated on the film substrate, so that the organic solvent may be volatilized incompletely, and the odor may be generated during the film operation. 【 Film Lamination Machine 】The operator causes damage (relative to the coating film coating process, the damage is much smaller), etc., the solvent evaporates after the film is coated, and it is easy to form bubbles on the surface of the printed matter.

Description and highlights of the glueless laminating machine

Since the invention, the glueless laminating machine has been widely used in the printing industry, packaging industry, plastics production and other industries, and its role here has not been neglected. Especially in the use of packaging is even more essential. Coating on the outsourcing of the product not only makes it look more high-end grade, but also makes the packaged product reusable. [ Thermal Lamination Machine ]  This not only saves costs, but also protects the environment better.


After the non-adhesive laminating machine is used, the surface of the composite printed product is bright, crisp, colorful, high in strength, waterproof and moisture resistant; it can be widely used in textbooks, books, calendars, cards, product samples, packaging cartons. Plastic molding is the ideal equipment for printing factories and packaging and decoration, American printing factories and professional plastics factories to improve the quality of printed materials and reduce the cost of the process. [ Thermal Laminator ] Manual, semi-automatic and automatic types can be customized according to customer requirements.

How to properly store white glue ?

                                 
                                Thermal Lamination Machine


01
Store before opening
Avoid glue exposure, rain (will reduce glue storage time, reduce stickiness)
Keep the room temperature at 15-25 degrees Celsius (storage temperature below 8 degrees Celsius will reduce the glue adhesion, below 4 degrees Celsius will lose the viscosity of the glue).

02 
Stored after opening
Do not infiltrate other substances into the glue bucket, otherwise local clumping, discoloration and deterioration will occur. [ Automatic Thermal Lamination Machine ] There is no need to add water to adjust the quality, and the addition of water will reduce the bonding strength of the glue, so the paste effect will not be achieved. Seal the plastic bucket and plastic bag immediately after use according to the amount until the next time you use it again. 

03
Storage after use
Clean the rubber bucket and plastic bag mouth and seal them intact, so as to prevent the dry film of glue remaining in the mouth of the barrel or the bag from falling into the glue, thus causing granulation. If it is not sealed, the glue will peel.
The pumping pump is immediately pumped into clean water to avoid accumulation of residue and gelation after solidification, which may cause blockage and affect production and use.

Factors affecting the quality of the film lamination

01
Print ink layer condition
Refers to paper properties, ink properties, ink layer thickness, graphic area and printed graphic density. [ Film Lamination Machine ] When the printed ink layer is thick and the image area is large, many paper fiber capillary pores are blocked, which hinders the penetration and diffusion of the adhesive, making the printed matter and the plastic film difficult to adhere, and delamination, foaming and the like are prone to occur.



02
environment humidity
Between the adhesive and the plastic film and the printed matter, as the relative humidity of the air changes changed the water content. Humidity-sensitive prints can cause internal stresses due to dimensional changes. For example, the longitudinal expansion ratio of the printed matter is 0.5%, and the longitudinal heat shrinkage of the BOPP film is 4%. If the water absorption of the printed matter is too large and the elongation occurs, and the internal stress is caused between the heat shrinkage of the film, the film product may be curled, wrinkled, and bonded. [ Fully Automatic Lamination Machine ] Not strong. In addition, in a high humidity environment, the equilibrium moisture value of the printed matter will also change, and a large amount of moisture absorbed from the air medium will be released from the surface during the hot pressing compounding process, stagnating at the bonding interface, and partially forming a non-adhesive bond. phenomenon. Moreover, the change in the equilibrium moisture value of the printed matter (moisture from the air medium or dehumidification into the air medium) occurs mostly at the edge of the printed matter, so that it forms a ruffled edge or a tight edge, and is not easily formed well with the film in the hot press composite. [ Automatic Lamination Machine ] The wrinkles are caused by the bonding, so that the production cannot be carried out smoothly.



03
temperature control
Heating can soften the film and bond the paper to the plastic film. However, the temperature is too high, the film is easy to break, which seriously affects the quality of the product. Therefore, measures such as fan cooling and turning off the heating wire should be adopted.

Commonly Used Lamination Film Are ?

Commonly used plastic films are: polyvinyl chloride (PVC), polypropylene (BOPP) and polyester (PET) films. Among them, BOPP film (15-20pm) is flexible, non-toxic, high transparency and low price, and is an ideal composite material in the film coating process. [ thermal lamination machine ]


Depending on the properties of the film itself and the purpose of use, the thickness of the film is preferably between 0.01 and 0.02 mm. It must be treated by corona or other methods. The surface tension of the treated surface should be 4 Pa, so as to have better wettability and adhesion. The corona treatment surface should be uniform and the transparency should be as high as possible to ensure the best definition of the covered print. [ thermal laminator ] The transmittance of PET is generally 88-90%, and the transmittance of other films is usually between 92-93%. The film needs to have good light resistance, is not easy to change color under long-time illumination, and the geometric size is stable.


Since the film is in contact with a solvent, a binder, an ink, etc., it must have a certain chemical stability. The appearance of the film surface should be flat, without unevenness and wrinkles, and the film is required to have no bubbles, shrinkage holes, pinholes and pitting. Due to the limited adjustment ability of the laminating machine, it is also required that the rewinding is neat and the two sides are elastic and uniform to ensure uniform coating.[ lamination machine manufacturer ] Of course, the cost is low.

Brief Introduction of Industrial Film Laminating

The film coating is a process in which a plastic film is coated with a binder, and the paper printed product is heated and pressurized to bond it together to form a paper-plastic composite product. The film-coated printed product has a thin and transparent plastic film on the surface, and the surface is smoother and brighter, thereby improving the gloss and fastness of the printed product. The color of the graphic is more vivid, three-dimensional, and waterproof. Anti-fouling, abrasion resistance, folding resistance, chemical corrosion resistance, etc.[ Automatic Lamination Machine ]


Air bubbles caused by production processes. Mainly refers to the control of some process parameters, including composite pressure, coating temperature and composite temperature. If the composite pressure is too low, the rubber roller pressure should be increased appropriately.[ Lamination Machine Manufacturer ] The compounding speed is too fast, and the compounding speed can be appropriately lowered, or the temperature of the rubberizing roller can be increased to increase the fluidity of the adhesive. Air bubbles on the surface of the film caused by dust and impurities should improve the environmental sanitation of the production workshop.

Why air bubbles occurred during the lamination ?

The viscosity of the adhesive is also an important cause of air bubbles. 
[ water based lamination machine]


Generally speaking, the viscosity of the adhesive is related to the molecular weight of the adhesive, the plasticizer and the type of the diluent, and the adhesive generally has a high viscosity and a poor fluidity at normal temperature, so in order to lower the viscosity and improve the fluidity, it is required to be higher in the compounding. Insulation at temperature. The higher the temperature of the two-component adhesive, the shorter the mixing and storage time, and the larger the ratio of the main agent and the curing agent, the greater the viscosity of the adhesive, the more unfavorable the formation of bubbles, and the more easily the bubbles are formed. Bubbles of the same size, low-viscosity glue can be eliminated, and high-viscosity glue may not work because the high-viscosity gel has a large molecular weight and poor leveling.[sheet lamination machine]

Why Bubble Appeared during the lamination process?

The cause of bubble formation:

Different types of composite substrates have different physical properties (such as gas permeability), and have a great relationship with the formation of composite film bubbles. Generally speaking, a substrate with good gas permeability (such as BOPP, CPP, CPE, LDPE) or a composite substrate with poor gas permeability (such as PVDC, BOPA) and another composite substrate with good gas permeability are compounded. It is not easy to generate bubbles. [ roll to roll lamination machine]

However, if the two substrates have poor gas permeability, when they are compounded, bubbles are easily generated, such as PVDC and BOPA. This is because the gas permeability of the two composite substrates is relatively poor, and the adhesive inevitably mixes a small amount of air on the compounding system. At the same time, the isocyanate adhesive itself is cross-linked and solidified during the curing stage of the composite film, and also produces gaseous by-products such as carbon dioxide (CO2). In this way, a large number of tiny bubbles are generated, thereby affecting the apparent quality of the composite film. [ film lamination machine]

At the same time, in order to make the composite substrate have a certain surface tension, the surface properties of the substrate must be treated, such as corona treatment, to improve the wettability of the surface of the composite substrate and improve the roughness, but the roughness exceeds At certain limits, it is difficult to be filled with viscous glue. Thus, large and small bubbles are formed between these minute engaging faces.

Film Laminating Process

Film coating refers to the transparent plastic film applied to the surface of the printed matter by hot pressing. After the film is covered, the film is smoother and brighter. The color of the graphic is more vivid. At the same time, it is also waterproof and antifouling. It can be divided into surface processing and forming. Hot stamping, glazing and other processing techniques; molding process. The film not only makes the surface of the printed matter wear-resistant, folding-resistant and chemically resistant. However, traditional plastic films are not degradable, difficult to recycle, and easily cause pollution. 

Therefore, in the major printing cities, environmentally friendly PET films are used to improve the laminating process. The film laminating machine manufacturers have also developed various excellent equipment for PET slitting (such as chain knife slitting) to complete the elegant upgrade in laminating process.