Corrugated board conveyor belt is undoubtedly one of the most important parts of the corrugated board production line. Its quality has a decisive influence on the quality of corrugated board, and has always been a concern of cartons and tile manufacturers. From the structural point of view, there are two kinds of transportation used by the corrugated cardboard production line cadres: one is a cotton belt, which is made of multi-layered cotton yarn, chemical fiber blended and woven by a weaving machine, and has a large weight per unit area, uneven surface, The friction coefficient is large and other shortcomings; the other is the acupuncture belt, which is based on polyester fiber, rayon as the basic raw material, processed by multiple processes of acupuncture machine, with a smooth surface, uniform thickness, no indentation and many other The advantages are increasingly favored by the majority of users.
Innovative structure
The traditional structure of acupuncture tape is three-layer: surface layer, middle layer and bottom layer. The surface layer and bottom layer are acupuncture flocking structure, the middle layer is warp roving and flocking structure, this structure itself is relatively Loose, small weight per unit area, when subjected to strong pull, speed up operation, not only put pressure on the cardboard carrying capacity is extremely limited, but also easy to deviation. It has a high elongation rate. After several months of use, it has to re-splice steel buckles, which takes time and effort, and affects production. This is also why the acupuncture belt has been difficult to increase its share in the market for many years.
Now the specific method is to use a unique production process, weaving seven layers of special PET fiber as the material in the acupuncture tape weaving layer, so that its structure is strong, the unit area of weight to 5.8kg/m2, and uniform thickness. As PET fiber is a material with high temperature resistance and high toughness, it greatly enhances the adaptability of acupuncture belts to high temperature, high humidity, high pressure, high tensile force and high-speed operating environment. The anti-expansion heat treatment setting method adopted by us in the production process completely solves the problem of large extension amount. The results show that when the working tension is 12 N/mm, the warping rate is only 0.3%. Generally speaking, after the corrugated board conveyor belt runs in the special environment of the tile line for a period of time, due to the continuous action of high tensile force and high pressure, the thickness of the corrugated board conveyor belt will have a certain degree of thinning; from the perspective of the cotton belt, the warp and weft yarns The characteristics of the weaving structure and the different pressures on the surface of the tape often result in smaller thicknesses at both edges of the tape. As a result, the effective width of the corrugated paperboard becomes smaller, the reject rate increases, and the cost is wasted. Acupuncture belts contain pressure-resistant, wear-resistant materials that allow them to maintain their thickness stability.
Excellent ventilation performance
Permeability is the most important technical indicator of the corrugated board conveyor belt. The technical index of the corrugated board corresponding to it is the moisture content. In other words, the moisture content of the corrugated board is dried through the conveyor belt. The work flow is that the conveyor belt applies pressure to the board and sticks it on the surface of the heating board, absorbs heat to evaporate water vapor, and water vapor is absorbed by the conveyor belt. And distributed in the run. Therefore, there is a very high requirement for the moisture absorption and breathability of the conveyor belt. Air permeability is too large, it will inevitably cause the paperboard to be too dry and easy to break. Poor air permeability will lead to high moisture content in the paperboard, reduced strength, warpage, and even affect the smoothness of subsequent cutting, indentation and other processes. Knit tape has a proper amount, uniform moisture absorption and rapid release capacity. From the point of view of use, the moisture content of the corrugated board can fully reach 11±3% of the national standard, and the adhesive strength of the board is also improved.
Smooth surface wear
We know that high-quality corrugated board is characterized by high corrugation, high tensile strength, smooth surface, and no indentation. These characteristics are largely achieved by the transport of the hot plate section and the cooling section. The special structure of the polyester fiber layer and cotton layer and the specially treated fiber material in the acupuncture belt contact surface show good elasticity, toughness and wear resistance in practical application. It can distribute the pressure from the gravity roller to the cardboard evenly and moderately, and at the same time maintain sufficient friction and adhesion, and easily and smoothly carry the cardboard running. Particularly valuable is that there is no indentation on the cardboard and the surface quality of the corrugated cardboard is improved. . This is the advantage that traditional acupuncture belts and cotton belts cannot match. Because the traditional acupuncture strips have been chemically hardened, they actually lose their original elasticity; while cotton weaves with thick-lined warp and weft woven structures, it is difficult to eliminate the surface roughness. These characteristics are often caused by the phenomenon of distorted corrugation peaks and indentation on the surface of the paperboard in an operating environment where the speed and pressure are constantly changing.
Dark connector
In fact, the tensile strength of the joint area will be reduced, making it difficult to withstand long-term strong pull and cracking. The acupuncture belt adopts ear steel buckle closed joints, and is divided into two layers in the joint area from 3mm below the belt surface, and the steel buckles are tapped in the lower layer. These processes are completed by a layering machine and a steel buckle machine, avoiding the manual tools. Deviation caused by joints. The steel buckle is completely covered by the upper layer, making it in contact with the cardboard to maintain the original moisture absorption, elasticity, toughness and wear resistance, and completely avoid the formation of periodic indentation of the cardboard due to the protrusion of the steel buckle.
The results show that the peculiar oblique connection and the special glue fixing treatment to the joint area can minimize the reduction of the tensile strength and ensure that the conveyor belt is still operating efficiently and lastingly.
High temperature resistance
Generally, the surface temperature of the tile hot plate is 170-190°C. The higher the tile speed, the higher the surface temperature of the hot plate. The actual high temperature resistance of the acupuncture belt reaches 200°C, and it can adapt to dry heat, hot and humid environment. On both sides of the conveyor belt, it is easy to directly contact the hot plate due to the narrow corrugated web, which affects the service life. Nomex fiber (resistant to 280°C) is used on the surface of the acupuncture belt. This fiber is a thermosetting material and will not melt, effectively extending the service life of the conveyor belt.
Running speed
As one of the most important parts of the tile line, the conveyor belt is driven by the drive roller of the double-sided machine, so it must be able to fully synchronize with the operating speed of the tile line, otherwise it will cause poor adhesion of the corrugated board and reduce the output. And other consequences. Acupuncture with a unique structural pattern and excellent material not only fully meets the high-speed, high-tension operation requirements of tile line, but also does not slip or slip, so that the improvement of production and quality can be achieved simultaneously.
Degreasing cleaning
As we all know, whether the surface of the conveyor belt is clean or not is an important factor in ensuring the smooth running of tile lines and the quality of the cardboard surface. We apply a special silicone treatment to penetrate the surface of the acupuncture band, which not only ensures the friction and adhesion between the surface and the cardboard, but also removes the adhesive on the surface without pulling out the fiber. It is easier to clean and can be soaked in water. It is suitable for soft brush cleaning, which makes it difficult to maintain the conveyor belt.