After the rise of micro-cartons in Europe, offset printing can also be used after printing, but A, C, B, and E high-end color printing is still limited to the offset printing process. Therefore, the amount of veneer laminating machines and glue used in the production of papers has not only declined, but has increased at a rate of 10% per year. In 2003, more than 1,000 veneers were sold in the Pearl River Delta, Yangtze River Delta, and the developed areas of Beijing, Tianjin and Tangshan. There is an increase in the production of adhesives for the production of adhesives. Based on my own experience, the author has listed some of the offset tile techniques for offset printing cartons for your reference.
Composite applications
The paper-bonding compound is the first post-printing process of the offset veneer color box. Stickiness and pressing directly affect the cartridge efficiency and the forming effect. Multi-layer carton (three-layer, five-layer), paper box and folding box, U/V card tile/tile tile, double-layer 500 card card card can be completed through the compound, the product is used for packaging Beer, liquor, beverages, food, fruits, appliances, electronics and cosmetics. Some small carton manufacturers outsourced the purchase of color noodles, posted on their own, made moon cake boxes in summer, and made fruit boxes in winter, regardless of the season. Many breweries also use offset veneer boxes, such as the Venus beer cartons branch that purchased 3 squeegee machines at a time. Due to the limitations of the process, the compounding efficiency is generally not high, and the wide-hour speed of 1200mm-1600mm is between 2500 and 7000 sheets. Therefore, the paper-bonding composite process is more suitable for carton and carton packaging with smaller batches and more complicated product structure. The normal color registration of high-volume RSC cartons should adopt flexographic post-printing, and dot printing can adopt flexographic or gravure pre-printing.
Product size limitations come from the device. From the crepe process itself, of course, a small-sized carton is easier to handle and quality is more easily guaranteed. For multi-layer backing composites, pay attention to the direction of the paper grain. The paper patterns on the two sheets of the carton are perpendicular to each other. The paper grain direction of the carton should be perpendicular to the direction of the corrugation, so that a higher compressive strength can be obtained and the permeability can also be reduced. phenomenon.
The operation of the automatic winding machine has a high requirement for the paperboard, and the paper and the single tile must be dry and flat. At the same time, the proficiency of the operating personnel is also high. The semi-automatic machine has a simple structure and is equipped with a cardboard anti-winding device, and the manual work is relatively flexible. Not fast. The production efficiency and machine cost of the fully automatic machine are almost 2.5 times that of the semi-automatic manual machine.
In order to avoid the corrugation height being less crushed and damaged during the compounding process, on the one hand, the board must not be too soft and the moisture content is controlled below 14%; on the other hand, the pressure, angle and speed of the press machine area are moderated. The effective lamination length of the domestic veneer machine is set at 3.2 meters. The carton factory may require the machine manufacturer to extend it to 3.8 meters. With a longer lamination length, the operator can remove and reduce the 22 nip rollers under the belt according to the product requirements. The automatic paper winding machine is equipped with a hydraulic sensing system at the press-fitting position and automatically raises the roller height to adjust the pressure of different paper sections. This user-friendly design can not only reduce the burden on the operator, but also protect the strength of the carton.
Bonding performance
Compression resistance, flat pressure, burst strength and adhesion are important physical indicators of corrugated boxes. Strength is related to the processing technology of paper and paperboard, and bonding and compound glue are inseparable. The veneer bonding directly affects the next process of the carton and the customer's on-line packaging. Gluing becomes an important part of the lap paper composite process. If the adhesive is not uniform, the adhesiveness is not good, the cardboard surface will blisters, and the cardboard back surface will be glued. The corrugated can see the powder.
The machine's machining accuracy determines the uniformity of the coating. The accuracy of the outer circle and the inner circle of the rubber roller requires the rollers to pass through the outer car and the inner car. The roundness of the rollers is exactly the same, and there will be no wheel eccentricity and rejection of the rubber after 2 years of operation. The accuracy of the veneer machine remains unchanged for at least 5 years. The automatic machine adopts built-in plastic tank, closed pump glue, glue supply hydraulic pressure, uniform, safety and hygiene.