Views:121 Author:Site Editor Publish Time: 2019-11-19 Origin:Site
Most of the engineering plastics are hygroscopic, while the conventional hot air drum dryers use dry air to dry the plastic, so the engineering plastics cannot be dried well. The presence of the dehumidifying dryer solves this problem. The status of the traditional hot air dryer is gradually replaced by a dehumidifying dryer. Do you know how to choose a dehumidifying and drying machine? Professional machinery manufacturer NTD tells us how to choose from a professional perspective. This article finds the answer.
First, you need to know the name of the raw material you need to dry. Find the drying time of the material by using the resin material drying parameter table provided by NTD.
Second, we need to understand the amount of raw materials used per hour. In the case of injection molding, the amount of raw material used can be calculated by a quick method of multiplying the clamping force of the injection machine by 0.1. The capacity of the drying hopper is obtained by multiplying the amount of raw material used per hour by the drying time of the raw material. Thereby, the dehumidifying and drying conveyor integrated machine of the corresponding model is selected.
For example, it is known that the raw material that we need to dry is PBT. The drying time of PBT is found from the list of drying parameters of resin materials.
It is 3.2 hours; it is also known that the customer's hourly usage is 20 kg, from which the capacity of the drying hopper is calculated as: 3.2 hours × 20 kg = 60 kg
NTD's NTD-75 hot air dryer has a capacity of 75 kg. Considering the need for a little margin, it meets the requirements, so the NDD-75 hot air industrial dryer is selected.
In another method, we check whether the maximum use temperature of the selected dehumidifying and drying conveyor is satisfactory according to the drying temperature of the dried raw material. NTD's standard dehumidifying and drying conveyors have a maximum operating temperature of 130 ° C; while high temperature models have a maximum operating temperature of 160 ° C.
The more accurate selection method of dehumidifying and drying equipment is to find out the name of the raw material that the customer needs to dry and the amount of raw material used per hour, and then find the dry air volume and drying time of the material through the attached list of drying parameters of the resin material.
When you calculate the capacity of the drying hopper, calculate the amount of dry air that needs low dew point temperature if you meet the drying requirements of the material per hour. Which type of dehumidifying dryer can be used to meet the drying requirements, and then decide which type of dehumidification to use.
For example, it is known that the raw material we need to dry is PBT. From the list of drying parameters of the resin material, it is found that drying 1 kg of PBT requires 3.2 m³ of dry air volume;
It is also known that the amount of raw material used per hour is 20 kg, and the requirement for dry air per hour is 3.2 × 20 = 64 m³
The NTD sample NDD-75 has an air volume of 80m³ per hour, which can meet the needs. At the same time, the hopper charge can meet the drying time requirement, so the NDD-75 equipment is selected.
Finally, check the conditions related to the raw material transportation, and confirm whether the parameters of the conveying part of the hot air drying and conveying machine meet the requirements of conveying capacity, conveying distance, conveying height, material specific gravity, conveying capacity, conveying distance, conveying height, material specific gravity, etc.
Have you learned the above method? If you have any questions about NTD dehumidifying dryer, please freely consult our professional engineers.