Plastic dryer

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Plastic dryer

Release time:2021-08-17 14:09:31  Source:Plastic dryer  Author:Plastic dryer

What is a plastic dryer?

plastic dryerPlastic dryers are mainly used for digitally controlled automatic dehumidification drying equipment for dehumidifying and drying plastics, resins or plastic particles. It can also be used for feed pellets, grains and other pellets. It is mainly used in the most common plastic injection and extrusion workshops.
Plastic dryer: It can be divided into hot air dryer, hopper dryer, honeycomb dehumidifying dryer, plastic humidifier, dehumidifying dryer, three-in-one dehumidifying dryer;
Because most engineering plastics are hygroscopic, coupled with the influence of weather and regional climate, it is easy to produce synthetic plastics with different particles to achieve the molding effect. In the granulation process of other plastic materials, the water content and hygroscopicity of the preformed gas are also different, such as PET, PC, PA, PBT, PPS, LCP, absorption and other hygroscopicity, so it is easy to foam and silver. If defects are found, There are problems such as cracks and cracks, which seriously affect product quality.
The plastic dryer will effectively solve the problems of bubbles, silver wires, cracks, stability, etc. that appear in the production process of the product.[Plastic dryer encyclopedia]

Working principle of plastic dryer:

Dehumidification and drying part: The hot and humid air coming back from the drying barrel is cooled and blown into the honeycomb runner. The moisture in the air is adsorbed by the runner and then desorbed by the regenerated heated air. The two airflows act on the runner at the same time, and with the rotation of the runner, the moisture in the air is continuously adsorbed and desorbed by the regeneration air to be discharged, forming a stable low dew point air, which is heated to the plastic The drying temperature is blown into the drying barrel to form a closed cycle to dry the raw materials.
1. Dehumidification dryer internal circulation: through the operation of the compressor → discharge high-temperature and high-pressure gas through the exhaust port → enter the condenser for cooling → become a low-temperature and high-pressure gas → intercept the flow through a capillary tube → become a low-temperature and low-pressure liquid → evaporate and suck through the evaporator Heat → return to the compressor to become a low-temperature and low-pressure gas. So it goes back and forth.

2. The external circulation of the dehumidifier: under normal startup → through the operation of the fan → moist air is sucked in from the air inlet → passes through the evaporator → the evaporator absorbs the moisture in the air on the aluminum sheet → becomes dry air → Pass through the condenser to dissipate heat → blow out from the air outlet.

Suction part: Suction is sucked into the dry bucket from the storage bucket or other storage bin containers. When the reed switch of the vacuum hopper detects that there is no material, the suction motor runs to generate a vacuum in the vacuum hopper. The raw materials in the storage bucket are sucked into the vacuum hopper due to the air pressure difference. When the suction time is completed, the suction motor stops running, and the raw materials fall into the drying bucket due to their own weight. The dried raw materials are drawn from the drying barrel to the electric eye hopper installed in the plastic molding machine.

Models and characteristics of various plastic dryers

Three-in-one dehumidification dryer:
plasticdryerThe three-in-one dehumidification dryer is the most advanced and energy-saving automatic mechanical equipment among plastic dryers at this stage. The three-in-one dehumidification dryer integrates three functions of dehumidification, drying, and two-stage feeding, and is especially suitable for strong moisture absorption. Engineering plastic raw materials. Such as PA, PET, PC, PBT, etc., among which optical-grade models can be used in the manufacturing process of optical-grade products such as lenses, LCD light guide plates, optical discs, and so on. Under ideal conditions, the lowest dew point can reach -50℃!
Three-in-one plastic dryer protection device:
Total power supply overcurrent no-fuse circuit breaker;Fan overload protection;Electric heating over temperature protection;Material suction and material shortage alarm;Overheat protection temperature switch;High temperature automatic power-off protection;
Plastic crystal dryer
Crystal dryer (also known as stirring dryer, pre-crystal dryer, pre-crystal dryer); crystal dryer has large processing capacity, low fuel consumption, and low drying cost. The PET crystal dryer has the characteristics of high temperature resistance, and can use high temperature hot air to quickly dry the material. The PET crystal dryer has strong expandability, and the design takes into account the production margin. Even if the output increases slightly, there is no need to replace the equipment. The PET crystal dryer adopts a self-aligning tug structure, and the tug and the rolling ring are well matched, which greatly reduces wear and power consumption. The blocking wheel structure specially designed for the stainless steel PET crystal dryer greatly reduces the horizontal thrust caused by the inclined work of the equipment. The PET crystal dryer has strong anti-overload ability, stable operation of the cylinder and high reliability.
Hot air dryer:
A hot air circulation type dryer. The heater is moved outside the barrel, and the hot air sent by the heater is sent to the barrel by the air circuit with a high suction and exhaust blade motor, and the hot air in the barrel can be transferred Then suck back into the heater to obtain circulating hot air; at the same time, a filter box is added to the air delivery loop, so that the hot air sucked back from the barrel can be filtered by the filter box and then returned to the heater The hot air conveyed by the air conveying circuit is input from the bottom of the barrel and is blown up evenly by the umbrella-shaped guide plate with through holes at the bottom of the trough.
Plastic dehumidifier:
Plastic dehumidifier, also known as rotary dehumidifier, reduces the dew point of dry air to below -40°C, and controls the heat to blow it to the surface of wet plastic particles, which can reduce the water content of the plastic before molding to below 0.02%, thereby improving the product the quality of. In such a harsh low temperature environment, general industrial dehumidifiers will be frosted and cannot complete the dehumidification work. Rotary dehumidifier will be a better choice

Plastic dryer application

1. Foundry industry: In this process, wax molds are repeatedly immersed in pottery clay. These outer layers form a mold. After the wax is melted, the molten metal can be poured into it. Dry air (very low vapor pressure) is better than others. The heating source is more commonly used to dry the clay layer, because the dry air will not cause the wax mold to be heated and deformed. The use of a hygroscopic dehumidifier can stabilize the operating cost of foundries in the foundry industry, increase the production volume, without slowing down the production pace in the wet months, and the process drying time can be shortened by 50%.
2. Dehumidification and drying of plastic raw material resin: All plastic raw material resins have a certain degree of hygroscopicity. When the plastic raw material particles are extruded, the moisture is heated and evaporated by the plastic raw material dehumidifier. These vapors will cause cracks in the structure and appearance of the plastic material. The desiccant dryer can reduce the humidity in the plastic raw materials and improve the quality of the finished product.

Plastic dryer operation guide

Work program :
1. Prepare before starting up,
2. Before adding the material to be dried, check that there is no remaining material of other materials in the dryer, and place the iron-absorbing stone stand.
3. Check whether the dryer is abnormal and the surrounding area is clean.
4. The bucket must be fully dried after putting in the material.
5. Check that the dried materials must meet the temperature requirements in the table below:
6. Check whether the set value of the thermometer meets the requirements. Open the damper.
7. When starting up, check whether there is any abnormal sound, check whether the fan rotation direction is correct or not, and whether the temperature controller is working normally.
8. Fill in the relevant process card.
9. When shutting down, check whether the materials are used up, close the air door, completely cut off the power supply, and clean up the work site.

Precautions for the use of plastic dryer fans

1. The fan will generate high temperature during use, so avoid touching the shell to avoid scalding;
2. The motor load current will vary with the air pressure used by the fan. When wiring, install an overload protection switch suitable for this model and use it under the rated full load current to avoid motor burns;
3. In order to prevent hard objects, dust, powder particles, fibers and water droplets from being carried into the fan when the air enters the fan, thereby affecting the efficiency of the fan, this
The machine is designed with an air filter, please clean the sundries in the air filter regularly (recommended once a week);
4. The internal and external surface dust of the fan should be cleaned regularly. If a large amount of dust accumulates, the poor heat dissipation effect will cause the temperature to rise, the air volume to decrease, and the vibration to increase.
Cause mechanical failure;
5. If the operation is not smooth or abnormal noise occurs during use, please turn off the power for maintenance;

Matters needing attention when using plastic dryer

Do not use the machine in the following situations
1. There is a damaged line;
2. To prevent electric shock, do not run the machine on the wet floor or after the machine is exposed to rain;
3. If the machine is damaged or disassembled, it should not be overhauled and installed by professional maintenance personnel;
4. During the operation of the machine, at least 1m of surrounding space is required. Please protect this device and flammable materials at least 3m away;
5. Avoid vibration and magnetic influence in the work area;
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