Martini's Wireless Ordering Operation Experience (2)

Second, the proper use of hot melt adhesive <br> <br> proper use of hot melt adhesive is the fundamental guarantee of product quality perfect binding, which plastic temperature control, the flow of glue, the thickness of the adhesive layer is crucial.

During the production and use of hot-melt adhesives, the control glue temperature shall be determined according to the normal speed, the ambient temperature of the working room, and the condition of the sheet. To keep the glue temperature stable, do not rise or fall. At present, the glue temperature of our factory during the production process is basically controlled between 155-162 degrees Celsius (+-2-3 degrees Celsius). When the rubber is getting too high, the glue flow is good, but the bubble is too Xin, it is also easy to cause rejection. That is, the book block is covered with glue before the cover is covered, and the glue on the table is seriously damaged. With hundreds of books will be times, affecting the degree of flatness, but also easily lead to aging, brittle, affect product quality. When the glue temperature is too low (for example, below 140 degrees Celsius), the glue is not completely melted, the adhesive effect is not good, the initial tensile strength and bond strength of the book page are greatly reduced, the absorption of the paper to the glue is reduced, and it is easy to cause loose/fall. page. The control of the glue temperature should also be based on the data of the technical indicators provided by the glue factory. The ambient temperature of the workshop will also be generated on the glue temperature. The phone number is too high in the sleeping season, but the glue temperature should not be less than 150 degrees Celsius. It has been argued that at room temperature at 30 degrees Celsius, the glue temperature should be around 120 degrees Celsius. This view is incorrect. Because in production, the glue temperature displayed by the thermostat is the current temperature of the glue liquid, and the room temperature cannot be stacked back to the glue temperature. It will only affect the cooling rate after the product is sized. Most of the hot melt adhesives now have an open time of 3-5 seconds and a curing time of less than 15 seconds. In other words, the gluing process is basically completed in less than 15 minutes. The remaining male is the temperature of the molded product adhesive. Decrease speed. The winter is the same, but the glue temperature should be increased a little, but it can not exceed 170 degrees Celsius, otherwise it is easy to cause plastic aging. Tests have proved that when the glue temperature is higher than 170, the hydrocarbon depth of the glue is deep, indicating that the glue liquid is close to the focus. At this time, attention should always be paid to observing the change of the glue, and the product should be destructively examined, and problems should be timely adjusted.

Of course, the hot melt adhesive products used in various printing plants are not the same, but the technical specifications of the characteristics of hot melt adhesives are basically the same. The key lies in whether they can be used correctly and reasonably adjusted.

The control of the amount of glue is related to the coating thickness of the book back glue, which directly affects the adhesive effect. It was found in the production that the first gluing office of the gluing table on the back of the book, in the case of increasing the amount of glue, the glue wheel often appeared without the phenomenon of plastic flower wheel. If the amount of glue is reduced, the book slot cannot be filled with glue. The main reason is that the glue in the glue tank is not replenished in time after the glue wheel has increased the glue amount. After many observations, we made improvements: an S-shaped steel eye is installed under the first rubber wheel scraper, and the width is 1/2 of the rubber wheel (2/3 is also available). It is to glue the glue on the glue part of the book part to re-enter the glue tank under the glue wheel, and increase the demand for the glue liquid in the book glue part. This improvement solves the glueless wheel phenomenon of the rubberizing wheel, and does not need to increase the amount of glue under the pre-sol cookware sink, and avoids the overflow of glue liquid in the glue pan which overflows on the gluing table control mechanism, and reduces Smaller risk of gum pollution and equipment operation safety of the equipment. At the same time, it also makes the back gluing more substantial, especially the glue in the back of the book is more full and the degree of adhesion is stronger, and the best effect is achieved with less effort.

The production of steel reeds is relatively simple. To find a piece of steel with a thickness of 0.5mm, make a comparative shape according to the width of the squeegee. The width of the top edge is 1/2 or 2/3 of the sizing wheel. (Depending on the thickness of the processed product Set), bent out of the arc (not to damage the turn round, increase flexibility), and lower than scraper 1-1.5mm, and then installed together with the scraper plate (in the lower part of the original scraper). The material must be made of good elasticity, no hard material, hard and hard, and damage the rubber wheel. After the system is adjusted, the reed can be scraped with the glue on the upper and lower blades of the scraper. The texture of the reed is relatively brittle. During the production, no marks can be seen at the folding site. Otherwise, the reeds in the plastic pot will attack the depriving effect and affect the uniform glue. If there is a similar situation with the second sizing wheel, the same can be added.

As an advanced binding equipment, the Martini Adhesives production line needs to continuously explore new technologies, improve operational capabilities, and accumulate good experience in production. Only careful and careful development can improve and improve the production.