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2 The hot back setting temperature control during manual binding rarely has automatic adjustment function. When the temperature is low, the drying is poor and the book spine is deformed; when the temperature is high, the drying is too fast, the local shrinks abruptly or the coating film surface is emptied or melted.
3 Binding device milling cutter structure defects, easy to cause the inner text page milling slot is too shallow, glue hot melt adhesive is not easy to perfuse.
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 drying tunnel, there are actually three different temperature regions and three concentration regions that are opposite to those in which the organic solvent is effectively volatilized, resulting in waste of resources rather than the expected adhesion effect.
6 The coating of the film coating equipment is designed together with the film discharge mechanism so that the area with the highest concentration of solvent volatilization is in the electrostatic field of film discharge. The static sparks and the highest concentration of extremely flammable and explosive volatilization gases are the root cause of sudden fires caused by the wet glue compounding process.
7 The thermal safety of the thermocompression bonding mechanism of the laminating equipment is generally unreliable due to the fact that the diameter of the heating roller is too small, the wall of the tube is thin, the thickness of the tube wall is uneven, and the thermal conductivity of the single-cavity air medium is structurally designed and produced. .
8 The coating thickness of coating equipment lacks a reliable control device and cannot meet the film coating requirements.
9 The drying equipment for coating equipment lacks a deep dry structure, 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 substrate surface.
3. In addition to the old 1 manual binding adhesives are all hydration type, concentration control is not standard. Not only cause instability of the adhesive force, 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 ingredients in the constituents are contradictory combinations. The infiltration of the book block relies on the fluidity at high temperatures, and 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. Coated film processing of low-value, intense competition tends to use solvent-based adhesives that appear to be low in price and high in cost, and forces adhesive producers to use alternative compositional materials in order to ensure their survival at low value. . 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-coated adhesives, glazing coatings and other materials is basically based on early foreign data and uses materials that have been eliminated in advanced countries.
4. The composition of the post-imprint basic team is a 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. Postpress workers rarely receive systematic training, and most lack basic printing knowledge. Basically, post-printing is in a physically redundant state of labor.
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 semiconductor temperature devices and digital liquid crystal display 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 quality The standard of technical supervision has been determined and the scope of application has been gradually expanded.
IV. "Hua Cui" brand solventless fusion 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 during the production of laminated film and the post-laminating products.
Fifth, pre-film dry-type composite film has been reduced to a simple hot-pressing technology, technology is concentrated to ensure heat. The HZ-920 liquid-dynamic infrared dual-cavity oil temperature compounding machine is characterized by outstanding technical innovation, easy operation, high efficiency and low consumption, and is gradually becoming a hot spot for investment in the new generation of film-covered equipment.
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.
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