Postpress Technology Follow-up & Printing 2

4 The reverse coating structure of the coating equipment is an independent power drive. The difference with the composite host, resulting in more or less glue error, affecting the stability of adhesion.
5 In the drying equipment of the film coating equipment, in the same dry tunnel, there are actually three different temperature regions and three concentration regions opposite to the effective evaporation of the organic solvent, resulting in waste of resources and failing to achieve the desired adhesion effect.
6 The coating of the film coating equipment and the film discharge mechanism are designed together so that the area with the highest volatile concentration of organic solvent is in the static field of film discharge. The static sparks and the highest concentration of extremely flammable and explosive volatilization gases are the root cause of the sudden fire caused by the wet glue compounding process.
(7) The thermal guarantee of the thermocompression bonding mechanism of the laminating equipment is generally precarious due to the fact that the diameter of the heating roller is too small, the wall of the pipe is thin, the wall thickness is uneven, and the thermal conductivity of the single-cavity air medium is structurally designed and the production and processing defects are unreliable. .
8 The coating thickness of coating equipment lacks a reliable control device and cannot meet the film coating requirements.
9 The drying equipment of coating equipment lacks deep drying function, so that the drying only shows the degree of surface layer.
10 Hot Stamping Anodized aluminum equipment is just a hot press main structure for layout replacement. There is no pretreatment device for processing the surface of the substrate. Therefore, when processing a new type of substrate, quality cannot be guaranteed only by hot pressing.
3, old materials 1 manual binding adhesive is all hydration type, concentration control is not standard. Not only cause instability of the adhesion, shrinkage after drying, but also makes the wire nail easy to rust.
2 The main component of glue hot melt adhesive is still EVA. Paraffin wax regulates its fluidity, tackifying resins reflect its viscosity, and talcum powder increases its hardness. The constituent materials in the composition are contradictory groups. The infiltration of the book block depends on the fluidity at high temperatures. This guarantee of fluidity is just an inducing factor for accelerating the aging of the hot melt adhesive, reducing the adhesive force, and significantly worsening the low temperature brittleness.
3 Solvent-based adhesives for lamination are customary materials. The fierce competition in the processing of low-cost coated films has tended to use solvent-based adhesives that appear to be low in price and high in actual cost, and forced adhesive producers to use alternative combinations to ensure their survival at low prices. Ingredients materials. This in turn increases the pollution of the production process and the subsequent problem of product quality.
(4) The composition of adhesive-bonded hot-melt adhesives, film-covered adhesives, glazing coatings and other materials is basically based on foreign patents of earlier patents, and uses materials and technologies that have been eliminated in foreign advanced countries.
4. The composition of the post-imprint basic team is the member of prepress and post-press screening. Compared with prepress and printing production processes, the cultural level is relatively low and the age structure is too large. Assault production and processing, and many rural idle labor temporarily supplemented to the manual operation of the production line. Post-press staff rarely receive systematic training and most lack basic printing knowledge. Basically, post-printing is in a physically redundant state of labor.
The production personnel of some technical posts, who have mastered the mechanical equipment, lack the common sense of machinery and the necessary maintenance, maintenance, and adjustment of basic skills, and cannot exert the normal efficiency of the machinery. It is even more evident in high-tech imported automation production lines.
There are many producers who do not understand the characteristics of the substrate. It is not understood that the substrates are subject to different changes due to climate effects. No trace of substrate deterioration was observed. Can not inject this kind of characteristic, objective conditions of change into their own operation intentions, adjust the production conditions accordingly, in order to achieve the best processing results.
The meeting communicated and exchanged the main results of the current post-press technology innovation and feedback from the application market:
First, the use of PN junction type semiconductor temperature devices and digital LCD display, the development of automatic temperature control system has been used in the vast area of ​​book binding hot back machine, glue machine glue tank, glue book repair and other production lines. The control of thermal power has improved the state of mechanical technology and material use performance.
2. The domestically-made disc type and bar type perfect binding machines have been mass-produced in Shanghai, Jiangsu, Hebei, Liaoning, Henan, Heilongjiang and other places, accelerating the improvement of the process of bookbinding in China to the wireless binding process. The milling and backing slotting knife is improved from V type to U type, which enlarges the cutting surface of the spine milling slot, which is beneficial to the infusion of hot melt adhesive.
Third, to adapt to China's paper substrate and high-volume, short-cycle printing, binding production characteristics of low-temperature high-strength new book binding hot melt adhesive TNS-TYHMA series in the disc, strip and automatic glue production line after use, has passed the quality The standardization of technical supervision determines that one after another will invest in new areas and expand the scope of application, which will play an effective role in the “year of binding quality for 2000”.
4. The “Hua Cui” brand solvent-free melt hot melt adhesive pre-coated film and dry composite technology have been applied in the printing, packaging, and surveying and mapping industries in 28 provinces, autonomous regions, and municipalities directly under the Central Government. Completely solve the various problems that occur when coating the plastic wet composite process during the production of the coating film and during the post-laminating product. And with detachable capabilities. To achieve the use of film products, the composite strength is high. When the product is discarded, it can be decomposed under certain conditions, and the paper, film, and hot-melt adhesives can be recycled separately to reuse the new level. This post-innovation scientific and technological innovation has won the third prize for scientific and technological progress in 1999 by the Press and Publication Administration.
Fifth, the dry film composite coating has been simplified to a pure hot-pressing technology; technology is concentrated to ensure heat. HZ-920 liquid dynamic infrared dual chamber oil temperature multifunction machine features excellent performance, easy operation, high efficiency and low consumption, etc. The technological innovation highlights gradually become the investment hotspot of the latest generation of equipments for film coating and finishing after printing.
Sixth, the coating method of drying is developing toward thermal curing, light curing and hybrid curing. Drying methods with deep curing of electron beam or other thermal energy are actively under development. UV coating coatings have been listed on the market in Shanghai, Guangdong, Hunan, and Henan. The water-based glazing coating suitable for the offset printing machine and the film-forming glazing coating can be applied on the printing production line. (Finish)