Application analysis of surface treatment technolo

  • Detail

Post press surface treatment technology and equipment application analysis

I. overview

post press surface treatment is becoming more and more important in packaging production. The success or failure of the current market competition largely depends on the packaging of commodities, and the quality of packaging is determined by the quality of post press surface treatment of commodities. Therefore, we can say that post press surface treatment is an important technical means to improve the quality of packaging and strengthen the competitiveness of commodity market

the commonly used post press surface treatment technologies are:

1. Surface waxing. It is mainly used in the packaging of fresh meat and agricultural and sideline products in the past to make the packaging bear a certain amount of moisture and moisture. This is to complete the wax coating process on the curtain flow coater

2. Film covering. Lamination is to cover the surface of the printed matter with plastic films such as propylene after the packaging products are printed, and use adhesives to bond them after heating and pressing to form a printed matter of paper and plastic integration

coating can be divided into instant coating and pre coating. That is, coating is to apply adhesive during operation, and then hot press to get the finished product. Precoating and laminating is to precoat the adhesive on the plastic film, dry and roll it, and then heat press it on the surface of printed products. They are completed on instant coated straw and pre coated straw respectively

3. Polish. Glazing is to apply (or spray, print) a layer of colorless transparent paint on the printing surface of the package, so as to form a thin and uniform transparent bright layer on the surface of the print after leveling, drying and calendering. It is completed by glazing machine and calender

4. calendering. Calendering is a finishing process after polishing printed matter, and some directly calender high-end paper products. The calendering of printed matter is because the gloss of the glazing material after natural leveling and drying is not ideal, and calendering must be carried out for some fine printed matter. The equipment used is calender, and many calenders are used together with glazing machines

5. Other special treatment techniques. In recent years, there are many special post press processing technologies for printed matter, which have developed rapidly. Common ones are surface gluing (also known as glue spraying), surface sanding (also known as sanding, that is, evenly grinding hemp sanding points on the surface of the print), embossing, embossing (concave) or simply pressing. All these new post press finishing technologies have been widely used in high-end packaging in daily use. Especially on exquisite handicrafts and cigarette packaging

II. Technological development and demand

1. Packaging post press surface treatment technology has become the intersection of various disciplines and technologies

packaging post press technology has shifted from the traditional waxing or film coating in the past to the cross technology of combining the surface shape and mechanical characteristics of printed matter. The traditional wax coating has no change in form for the printed matter (before surface modification), only the wax juice is coated and attached to the surface of the printed matter

2. New materials are constantly applied to surface finishing

with the improvement of people's requirements for the quality and decorative performance of printed matter, many new materials are applied to the surface finishing process of printed matter. The new materials widely used in the surface finishing of printed matter are mainly monologue inks and coatings with various properties. With the rapid development of Printing Science and technology, printing has completely changed the traditional concept of reproduction. Modern printing is a combination of technology and art. It is based on the information process of high-tech foundation. At the same time, it uses high-tech means to make printed matter more beautiful. The material basis of this beautification effect is special performance inks and less materials. For example, UV curable coatings have been used in the surface finishing of printed matter instead of traditional waxing and coating. For another example, imitation gold and silver inks and coatings have been used to replace bronzing and silver stamping. In particular, some high-end tobacco and alcohol, high-end cosmetics and high-end gifts and clothing emphasize the exquisite effect of packaging, which is that some traditional decorative inks and coatings are difficult to meet the requirements, and have more ridicule requirements for new decorative inks and coatings. It requires its application to have high production efficiency, good printing adaptability, and drying speed. Startup: set the barrel heater to the normal processing temperature, with high gloss, high covering power, good adhesion, durable wear resistance, safe use, no plugging (holes), easy cleaning, no pollution and other properties. In response to these properties and requirements, UV curable imitation ink has recently been introduced at home and abroad, and is widely used in high-end tobacco and alcohol, gifts, greeting cards, invitations, calendars, business cards, advertisements, art paintings and other high-end packaging boxes (bags). For a long time in the future, Xinte inks and coatings are still the research focus of surface finishing materials

3. The update speed of post press finishing technology and equipment is accelerated.

post press surface finishing technology has developed rapidly. The past surface waxing has long been replaced by the surface, and the surface coating has been partially replaced by surface polishing (polishing solution) not long ago. In the past, the general glazing and drying was heated by far-infrared heater (or ordinary heater), which has the disadvantages of slow chemical reaction speed, and this kind of packaging structure is also convenient for food to be heated in the microwave oven, and the product is easy to deform. Recently, UV curable coatings and inks have been rapidly promoted and applied, and there is a trend to gradually replace coating and infrared heat curable coatings

at present, the varieties and specifications of surface finishing machinery and equipment for packaging and printing in China have been diversified, and the number has reached more than 100. In the past, some major models and models were imported. After years of digestion and absorption, most models have been able to design and produce by themselves. With the application and promotion of high technology, some old-fashioned equipment and processes have been gradually eliminated. For example, surface wax coating equipment and processes have been gradually replaced by film coating or polishing processes. Therefore, curtain flow wax coating machines have basically stagnated, and few manufacturers reproduce

with the diversification of printing products, especially the increasing use of various exquisite small gifts for small handicrafts owners, some small printing equipment and accessories have a broad market and form a new type of application field. For example, the multi-function glue passing (glue spraying) machine has become a hot commodity in the current market. The functions of this glue machine include: speed regulation, humidity and pressure control, LCD, pre calibration function, mounting equipment, general glue and cold glue regulation, etc. Some glue passing machines can also realize color hot word pad printing and mounting. They can achieve ideal results in posters, inkjet printed documents, leaflets or large maps. In addition, other printers with origami binding and bar code labels have also entered the market in batches and become post-processing equipment for printing

III. problem analysis

1. technology and performance problems

in terms of packaging and printing surface finishing technology and equipment, China still has a considerable gap compared with developed countries in the world, especially in the difficulty of sample notch manufacturing, especially in the automation, viability and adaptability of related technologies and equipment. From the perspective of technology and equipment application, we are still in the initial stage. For example, there are still some problems in the technical problems of film covering equipment, domestic equipment and adhesives to varying degrees, such as deformation, durability, separation of film and base paper, and there is no ideal solution. In addition, the glazing and glue spraying technology and equipment of packaging and printing surface have become the mainstream of packaging surface finishing technology and equipment abroad with an expected annual yield of 5.5% in three years, while our mainstream is surface coating, all of which we need to solve

2. The problem of equipment model size

because many modern commodities win in the competition by relying on characteristics and personality, and the best-selling cycle of a product is getting shorter and shorter, and the replacement is getting faster and faster. If the enterprises engaged in packaging surface finishing want to achieve a large scale, it is unlikely that they will rely more on small and medium-sized enterprises to complete. Therefore, while improving the reliability of the equipment, the equipment model tends to be more small and medium-sized to adapt to the changes of the market

3. energy saving problem

printing equipment includes post-processing equipment. The main energy consumption is its transmission and heating system, and the heating (drying) system accounts for a larger proportion of energy consumption. Heating and drying are mostly electric heating. In the past, many equipment used ordinary electric heating tubes (wires) for heating, which has high energy consumption and correspondingly high cost. Energy saving and cost reduction is the goal of enterprises from beginning to end. Now, some equipment have adopted advanced heating and conduction methods, such as chemical heat transfer fluid, infrared heater, ultraviolet heater, etc

4. function and adaptability

different materials have different properties and effects. Such as glazing, some use plastic substrates, some use paper substrates, and some use synthetic substrates, which does not require its equipment to meet the glazing of these substrates and achieve the required effect. In addition, for glazing liquid, there are water-based, oily, solvent based and so on. In addition, a new type of polishing liquid with special properties has been emerging, so the finishing equipment should meet the finishing requirements of these materials, which also requires the equipment to have a wide range of adaptability. In addition, enterprises are required to occupy as few equipment and sites as possible and complete as many finishing operations as possible to reduce processing, storage and transportation costs. As a result, multi-functional glazing calenders, film coating calenders, calendering concave molding machines, glazing die-cutting machines have appeared one after another

5. Reliability problem

reliability is the first consideration in the design of any packaging and printing equipment. The fierce competition in the market requires that the equipment can be quickly adjusted according to the requirements of customers' products, and different components and mechanisms can be replaced, which can be easily operated, reliably controlled and operated, so as to improve the accuracy and efficiency of processing

surface finishing technology has been applied to various non professional fields. For example, many people who use all kinds of daily necessities, cultural goods, decorative goods, handicrafts, etc. do not have professional skills, and the operation is not as handy as professionals. This requires mature technology and reliable equipment. Reliability is an important guarantee for the extension and penetration of packaging and finishing equipment and technology to other industries and fields

source: Greater China Printing

Copyright © 2011 JIN SHI