Infrared Rotary Dryer For PET monofilament yarn making machine
----- To Dry and Crystallized PET Chips/ Flake before fed to Extrusion Production Line
>> Crystallize and Drying PET Flakes at one step
>> Drying time 20mins
>> Final moisture can be 50-70ppm
>> Save 45-60% energy cost :
HOW TO WORK
1. Material Feeding 2. Rotary Crystallization 3. Discharging
Processing Explanation
1) At first step, the only target is to heat up the material to a preset temperature.
Adopt relatively slow speed of drum rotating, the Infrared lamps power of the dryer will be at a higher level, then the PET Masterbatch will have a fast heating till the temperature rises to the preset temperature.
2) Crystallization step
Once the material gets to the critical crystallization temperature, the speed of the drum will be increased to a much higher rotating speed to avoid the clumping of the material. At the same time, the infrared lamps power will be increased again to finish the crystallization. Then the drum rotating speed will be slowed down again. Normally the crystallization process will be finished after 15-20mins. (The exact time depends on the property of material)
3) After finishing the crystallization processing, the IR Drum will automatically discharge the material and refill the drum for the next cycle.
The automatic refilling as well as all relevant parameters for the different temperature ramps is fully integrated in the state-of-the-art Touch Screen control. Once parameters and temperature profiles are found for a pecific material, theses settings can be saved as recipes in the control system.
System Advantage by IRD
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Infrared Crystal Dryer system and Conventional Dehumidifier&crystallizer system
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Example: PET Bottle flake Capacity 500kg/h Crystallized and Drying Final moisture 150-200ppm
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Drying time
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10-15mins
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Dehumidifying: 4-6 hours
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Crystallization: 2hours
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Energy consumption
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About 120w/kg/h | About 200w/kg/h |
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IRD system save: 80W/kg/h Energy cost: 0.073USD/kwh Output 500kg/h Will save 500×0.08×0.073= USD2.92 Operating hours/year: 3000hours: USD8,760 5000hours: USD14,600 8000hours: USD23,360 |
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Processing
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Drying and Crystallization at one step | Dehumidifying and crystallization at 2 steps |
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Crystallization
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Higher grade of crystallinity if requested, crystallisation at high temperatures (180°C)
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Normally running temperature about 150°C,
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How Infrared Crystal Dryer Dry?
Features of infrared dryer (IRD)
>>The infrared crystal dryer is the latest drying technology developed at present, and the infrared crystal dryer only needs 8-20 minutes, crystallization and drying are completed at one time, saving time, electricity, good drying effect, convenient maintenance and low cost, which is the highest efficiency at present , The best choice for low energy consumption drying method.
>>There are three P.I.D temperature control zones, and the crystal drying temperature can be set according to the characteristics of the raw materials.
Infrared principle
Infrared principle
The frequency of infrared is about 1012 C/S ~ 5x1014 C/S, which is part of electromagnetic wave. Near infrared wavelength is 0.75~2.5μ and travels straight at the speed of light, and it goes around the earth seven and a half times per second (about 300,000 Km/s). It can be seen from the light source It is directly transmitted to the material to be heated, causing physical phenomena of absorption, reflection, and transmission.
In addition, the infrared rays that penetrate and reflect from the material do not affect the organization of the material, but the absorbed tissue will be converted into heat energy due to molecular excitation, which causes the temperature of the material to rise. Taking PET as an example, crystallization and crystallization can be achieved in a very short time. The drying temperature can not only save energy, maintain the physical properties of liposomes and increase the IV value.
(The argument to increase the IV value (intrinsic viscosity) needs to be further verified by experiments.)
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Infrared Crystal Dryer
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Convective heating
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Infrared drying(IR ) :Heat is adsorbed inside the pellets.Plastic and water are excellent IR adsorbents. It takes about 15 to 20 seconds to heat a pellet entirely
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Convecting Drying :Heat conducts into the pellet,plastic is a poor heat conductor. It takes about 30-50 minutes to heat a pellet enturely
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Water vapour moves to the coolest area,IR heating starts inside the pellets and immediately heat is conducted towards the cool ambient air.In this phase the moisture is heated and vapourised immediately and is arracted out of the pellet into the cooler ambient air
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Vapourised water moves to the coolest area,convective heating starts at the surface of the pellet and slowly heat is conducted towards the center.In this phase the moisture is attracted towards the cooler center of the pellets.Drying doesn't even start.What is more the moisture concentration inside the pellet increases
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Heating difference principle explanation
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The physical force for moisture diffusion is a difference in temperature and a difference in partical pressure 1)IR-provides a high vaporisationrate on moisture in the core 2)The driving force for diffusion is a difference in Temperature between the vaporised moisture and the ambient air 3)IR used cool ambient air so a permanent difference in partical pressure is always avaliable T particle > T ambient P particle > P ambient |
when the entire pellet has reached the same temperature as the hot ambient air drying starts: 1)vaporisation rate is low 2)Vaporised water is transported from the core of the pellet to the surface 3)The driving force for this diffusion is a difference is partial pressure of the ambient air 4)To ensure this process is effective desiccant air with a low dew-point is applied generally.
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Machine Video
Contact Information
HOW TO ENSURE THE QUALITY!
● In order to ensure the accuracy of each part, we are equipped with a variety of professional processing equipment and we have accumulated professional processing methods over the past years.
● Each component before assembly needs strictly control by inspecting personnel.
● Each assembly is in charged by a master who has working experience for more than 20 years
●After all the equipment are completed, we will connect all the machines and run the full production line to ensure the stable running in customers' factory
Our Service
1.We will provide testing if the customer comes to visit factory to see the machine.
2.We will provide detail machine technical specification ,electric diagram,installation,operation manual and all the documents which customer needed for clearing customs and using the machine.
3.We will provide engineers for helping installation and training the workers at customer's site.
4.Spare parts are available when they are needed .Within warranty time,we we will provide spare parts free,and over warranty time,we will provide spare parts with factory price.
5.We will provide technical support and repair service in the whole lifetime .
