According to the technological requirements, the main equipments for the production of paper-molded products include hydraulic pulp machine, pulp pool, forming machine, dryer and setting machine.
The function of the hydraulic pulper is to disintegrate the waste paperboard and turn it into pulp, which can be divided into two types, vertical and horizontal. The horizontal hydraulic pulper is commonly used in the production line of industrial packaging products. Its advantages have only dispersion effect on the paper fiber, no cutting effect, high fragmentation efficiency, short disintegration time, low power consumption, simple structure, and can handle large Miscellaneous, metal debris waste paper. The machine is mainly composed of a horizontal tank body and a working impeller. There is a feeding port on the top and a row of slurry and slag discharge port on the bottom. The working impeller is fixed on the shaft end extending from one end into the tank body.
The diameter of the impeller is generally 1/2 or 1/3 of the diameter of the tank body, and the linear speed of the impeller rotation is generally 15 to 17.7 meters/second. When the impeller rotates during operation, a high-speed rotating water flow is generated, and the cardboard begins to disintegrate under the action of high-speed water flow and centrifugal force. The disintegrated pulp can be discharged through the discharge port from the mesh plate outside the impeller.
The debris that cannot be disintegrated is attached to the wall of the tank under the effect of centrifugal force to rotate. When the machine stops, these impurities settle in the slagging outlet of the bottom wall of the tank, and the slag discharge port can open the slag. The thick slurry is discharged to the slurry pool and diluted in the slurry pool to a working degree. At the same time, some process aids and functional auxiliaries are added. The distribution tank is equipped with a propeller so that the slurry always maintains a rotation cycle in the working system to avoid fiber precipitation.
The molding machine is a machine that guarantees the operation of the molds for the pulping, dewatering, and removal of wet paper blanks. Its main structure includes: racks, pulp boxes, lift cylinders, guide columns, upper and lower formworks, and chlorine chambers that are attached to the formwork (although they communicate with the vacuum system and the air compressor).
During work, the punch of the forming die is fixed on the lower die plate, and a large number of small holes are communicated with the air chamber on the die. The punch die is lined with a net die that completely fits the surface of the irregular punch die, and the current die plate is pushed under the chlorine cylinder. Carry the punch into the slurry in the slurry tank. At this time, the chlorine in the lower mold generates negative pressure from the vacuum pump. The water in the slurry flows through the inlet of the screen and is filtered through the gas chamber and the pipeline. The fiber is retained on the screen. Wet paper blank; then the lower die starts to ascend, and after the slurry surface is lifted, the wet paper blank on the net mold is continuously dehydrated under vacuum adsorption.
At this point, the lower die continues to ascend and the female die fixed on the upper die plate is closed and mechanically dewatered. Then, the vacuum is cut off in the lower mold air chamber to enter the compressed air, and the vacuum is turned on in the upper mold air chamber. The negative pressure is transmitted to the wet paper blank through the small hole on the die, and the wet paper blank is under the action of â€œpushâ€ and â€œpullâ€. The lower die is passed to the upper die and the upper die begins to descend again.
Manually push the tray under the upper mold, touch the upper model chlorine chamber pneumatic reversing valve, the upper mold air chamber cuts the vacuum to enter the compressed air, the wet paper blank is blown onto the tray, and manually put the tray together with the wet paper blank to dry On the conveyor belt, this is a complete working section of the molding machine. Although there are many forms of pulp molding machines, there are two molding processes: in-mold quantitative grouting and out-mold adsorption molding. The principle is that the pulp flows through the net mold, the water is filtered out, and the fibers are intercepted on the net mold to form a wet paper blank.
In-mold grouting is to ensure the thickness of products through a certain amount of pulp, while the outside of the mold is to ensure the thickness of the product by controlling the pulp degree and adsorption time. Most of the paper mold industrial packaging products use reciprocating mold adsorption molding. This molding machine can produce large area products with strong adaptability and can form an automated production line.
The dryer is recommended to use the heating method of the fuel stove. The drying structure includes the head, tail, transition section, intermediate heating section, burner, induced draft fan, transmission belt and automatic control box. During operation, the combustion furnace atomizes the diesel fuel and sprays it into the combustion chamber for combustion.
If the product shape and size requirements are very strict, the wet paper blank needs to be shaped, and the wet paper blank to be dried to a certain degree is put into the shaping die to be pressurized and heated to dry the product in the die. The setting machine is actually a small four-column press (hydraulic or pneumatic). The only difference is that the fixed mold fixed to the upper and lower platens is equipped with heating elements. The three key factors in stereotyped pulp molding are:
1 pressure, requires a projected area pressure of 0.4-0.6MPa;
2 temperature, mold cavity temperature is generally required in 180-200 Â°C;
3 is determined by the shape and thickness of the product, generally 30-50 seconds.
In practice, the final thickness of the product is approximately 70% of the thickness of the mold cavity.
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