Cardboard Problem Solving--Materials, Equipment, Process Collocation

Five raw materials, equipment, craftsmanship collocation

First, the company's own cardboard production facilities are capable of producing high-quality, low-grade, low-grade, corrugated, congenital conditions. Must have excellent operating technicians, and they must be very familiar with the production process of corrugated board processing, understand their own production equipment characteristics and technical requirements. In addition, the ability to produce high-quality products depends on the accuracy of the equipment and the lifeline of the entire production line, the adhesive.

Whether the adhesive can meet the requirements of the current low-weight corrugated board production line is a key aspect. Low-strength corrugated board must use adhesives with high viscosity and good moisture resistance. Therefore, the production process of the adhesive must be adjusted. Generally, the viscosity is controlled within 8 seconds to 25 seconds (No. 3 cup), and the amount of glue applied is controlled at about 0.15 (depending on the gap between the companies on the rubber rollers). It is better to use the adhesive. 25-32 lines of 90-degree concave adhesive anilox roller, can not only ensure the uniform amount of glue, but also reduce the cost of glue.

The main three main parts of a single-sided machine are mainly corrugating rollers, pressure rollers and adhesive anilox rollers. If not handled properly, it will shorten the service life, which will cause great losses to the company. How to control and choose to glue the anilox? First of all, the material used in the article are generally made of 48 # CrMon steel, after the intermediate frequency quenching or nitriding treatment, the hardness is generally at HR60 degrees, the static balance generally have to reach 0. About 02mm, but the dynamic balance can not exceed 0.04mm, the surface of the blood coating is best to use tungsten carbide steel, the thickness of 10 silk, if the plastic anilox roller to achieve the above requirements, you can greatly improve the use of life. Secondly, it is advisable to apply paper to the left and right when producing small widths. This can extend the high holding time between the pressure roller and corrugating roller and corrugating roller and increase the service life. For the low-weight B and C grade corrugated papers currently used, the sand content is too high. A dust brush can be installed on the preheater (two sides of the single-sided machine) to reduce impurities and sand on the wadding paper. Improve corrugating roller life.

Corrugated paper is not glued to the inner paper. When the paper is skewed, it is advisable to speed up the speed. A point is set on the surface guide of the paper holder or on the cylinder surface of the preheater, and the position can be adjusted visually to adjust the position immediately. Tile paper often breaks the paper, and can be processed according to the weight and quality of the base paper or tile, which can reduce the preheating area. If the bad or low moisture content, the raw paper can go straight through the preheater; The production of A cardboard or high gram weight (imported paper) can be installed in front of the preheater spray, the appropriate increase in cardboard moisture, these are operators must understand and to carefully operate.

The paper produced by each single-sided machine should not be piled up too much in overpasses to avoid excessive speeding or accelerated pulling-off of the compounding machine. Each machine always observes the amount of overpasses accumulated to match the speed of the composite machine, but the speed of the composite locomotive depends on the enterprise's equipment. Too slow and too fast the speed will have a certain impact on the cardboard, especially the currently used A-Watts. The surface of the cardboard is uneven and there is a phenomenon of bending.

When the adhesive breaks, the upper lap surface should follow the running direction of the paperboard, and the joint cannot be too long, preferably in the range of 30mm-50mm. When the width of the corrugated paper in the single-faced corrugated cardboard is inconsistent, the paper holder controlled by the sliver is scraped. The paper holder can be properly adjusted. The two plywoods are slightly smaller than the width of the paper. When the width of the paper is wide, use a knife to scrape or enlarge the paper holder wider than the part of the paper in the single-sided machine. It is advisable not to go through the final compounder preheater, remove the paper guide, and re-invent a piece of guide paperboard. From the upper suction opening to the large preheater, directly into the compounding machine, this will reduce the friction between the corrugator and the preheater and prevent pitting. Skew down. When using ordinary low gram paper for pasta paper, after being warmed up, the base paper becomes brittle after entering the drying tunnel, and it is explosive when the wire is pressed. It is better to turn off the last hot plate or pre-composite machine. Heater is equipped with vapor spray at appropriate position to increase the temperature of cardboard and maintain the toughness of the paperboard; or to reduce the preheating area, and at the same time, the amount of glue can be increased appropriately to reduce the paper sheet strength; however, it should not be excessive, otherwise there will be paperboard bending or streaking.

In the production of parking as little as possible, when it is necessary to stop, the operator according to the prevailing conditions of the scheduled parking time, such as a short time: (a layer of cardboard 2 minutes, three layers of cardboard more than half a minute) is best cut at the dryer inlet Layer paper, open it out of the drying tunnel.

According to the required requirements, the paperboard is pressed, slit and cross-cut. When the paper is pressed, the paperboard and paperboard temperature are adjusted to the depth of the pressline. The indentation of the inside line is easy to break and is not broken; it is not necessary to trim the edges, and there are flash edges. Correctly adjust the positioning position of the pressure divider, use high-quality thin knife, preferably use manual sharpening, but the time can not be too long, which can prolong the service life of the thin knife; the cross-cutting knife is blunt, and it is easy to tear the cross-section when producing imported paper. , Should be polished or replaced in time new knife, cross-cutting knife blunt, fine sand turbine can be used to grind, grinding must be the same as the upper and lower cross-cutting surface, but a certain skilled hand can be polished, so as not to hurt the knife.

In addition, according to the production conditions at that time, the production was skillfully matched to reduce waste and improve the passing rate of finished products.

(Author: Hou Yu billion just to Paper (Shanghai) Co., Ltd.)

Corrugated Carton, July 2005 issue