Drying Hoppers for Plastic Resins
Yushine insulated hopper dryer features a down-blowing European design and a dual-wall stainless steel body. This design makes it particularly effective for drying engineering plastics, mainly when used with dehumidifiers. The series is offered in various sizes to suit diverse loading requirements.
- Equipped with overheat protection and features automatically timed on/off.
- The down-blowing air design ensures even dispersion of hot air.
- The entire machine is detachable for easy cleaning and replacement of parts.
- Visual window, drying effects visible.
- Optional accessories include a Euro-hopper suction box, Euro-hopper mobile floor stand, material door magnet, magnetic base, blower inlet filter, and hot air recycling exhaust air filter.
Precise Control and Efficient Design
Control by Microcomputer:
A microcomputer-based system achieves precise temperature control, guaranteeing drying stability.
The Design of the Air Duct for Downward Blowing:
The fresh wind duct downward blowing type evenly distributes the airflow around the plastic to maintain dryness and stabilize temperature, thus significantly improving drying efficiency.
P.I.D Control and LED Display:
Users can easily monitor the working state of equipment due to digital P.I.D control and LED display.
Modern Safety and Energy Efficiency
Modern Appearance and Safety Protection:
It has a new, bright surface appearance. Overheat protection devices prevent accidents caused by human or machine error.
Energy-Saving Design:
To save energy, the weekly timer function realizes automatic opening/closing.
Design of Large Capacity Model:
SHD-80U and above models can open the vision hopper door for good sealing and easy cleaning. Models SHD-1200U and above are equipped with stainless steel support plates and aluminum bases. Models SHD-1500U and above come with manual butterfly valves and optional protective ladders.
Applications and Limitations
The SHD-U series is suitable for drying raw and recycled plastic materials, including common plastics such as ABS, PA, PBT, PC, PE, PET, PMMA, PP, POM, PPS, PS, PUR, and PVC.
Specific Limitations:
The SHD-U series is unsuitable for drying plastic powders, food items, chemicals, and flammable, explosive, or volatile substances.
High Moisture Sensitivity Materials:
The SHD-U series must be used with the SD-H series dehumidifier for materials with high moisture sensitivity, such as ABS, PA, PC, PET, and PMMA.
Irregular Material Shapes and Sizes:
When dealing with plastic raw materials with uneven pellet sizes or other forms, it is essential to consider the bulk density of the materials to ensure adequate drying.
- Datasheet
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- Certificates
| Model | Dimension HxWxD（mm） | Weight(KG) | Process Blower(kw) | Drying Heater(kw) | Regeneration Blower(kw) | Regeneration Heater(kw) |
| SD-40H | 1260X510X860 | 145 | 0.12 | 4 | 0.4 | 4 |
| SD-80H | 1360X530X(820 | 170 | 0.75 | 6 | 0.4 | 3 |
| SD-120H | 1360*530*820 | 170 | 0.75 | 6 | 0.4 | 3 |
| SD-200H | 1560*660*1050 | 265 | 1.5 | 12 | 0.4 | 4 |
| SD-400H | 1560*660*1050 | 330 | 3.75 | 18 | 0.75 | 7.2 |
| SD-700H | 1935*900*1380 | 480 | 7.5 | 24 | 1.5 | 10 |
| SD-1000H | 2145*1300*1550 | 700 | 13 | 32 | 3.75 | 15 |
| SD-1500 | 2060x1410x2120 | 1010 | 9*2 | 58 | 7.5 | 28 |
| SD-2000H | 2060X1410X21510 | 1300 | 13*2 | 80 | 7.5 | 28 |
| SD-3000H | 2240X2035X2160 | 1600 | 13*3 | 96 | 9 | 32 |
| SD-4000H | 2060X2750X2250 | 2200 | 13*4 | 128 | 5.5*2 | 56 |
Certificates
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Drying Hopper FAQ Guide
In this guide, we address common concerns and questions about using drying hoppers. Whether you’re new to this or an experienced user, our FAQs will help you understand and get the most out of your equipment. Don’t hesitate to contact our customer service team for any further questions or support.
- How Many Kinds of Hopper Dryer?
- How does drying airflow affect plastic pellets?
- How to select a suitable model for dehumidifying dryers?
Yushine company offers two types of hopper dryers:
Hot Air Hopper Dryer
A hot air hopper dryer is used to dry plastic granules by allowing hot air to pass through the material placed within a hopper. The temperature can reach up to 160 °C in this dryer. It can also be used to remove non-hygroscopic materials, including ABS, PS, and PP.
Insulated Hopper Dryer
An insulated hopper dryer is a device used to dry materials containing moisture. The stainless-steel hopper is dual-layered, increasing the efficiency and effectiveness of the drying process.
No heat losses are associated with the insulated hopper dryer. The temperature in this type of hopper dryer reaches up to 180 °C.
Plastic materials have different drying airflow requirements because of their varying physical and chemical attributes, affecting moisture migration and elimination. Therefore, it is necessary to have an appropriate drying airflow that will enable efficient moisture removal, hence preventing defects in the final product. Below are some standard plastic unit drying air flow rates:
ABS (Acrylonitrile Butadiene Styrene): 1.8~2.4 m3/hr·kg
PC (Polycarbonate): 2.2~2.8 m3/hr·kg
PA6 (Nylon 6): 2.0~3.0 m3/hr·kg
PA66 (Nylon 66): 2.2~3.2 m3/hr·kg
PET (Polyethylene Terephthalate): 1.5~2.0 m3/hr·kg
PP (Polypropylene): 1.5~2.0 m3/hr·kg
PE (Polyethylene): 1.0~1.5 m3/hr·kg
These figures can be utilized when selecting an appropriate drying dehumidifier so as to achieve optimal drying performance and quality materials output during processing operations involving plastic material transformation stages like extrusion or injection molding among others.
For a detailed analysis of the impact of airflow on the dehumidification of plastic resins and the importance of achieving the correct drying conditions, I recommend reading ‘Theoretical Analysis of Mass and Heat Transfer through a Dehumidifying Plastic Dryer’ by Anthony A. Adeyanju.”
Here are the steps to follow when selecting an appropriate model:
Identify the DH-U hopper loading capacity:
Calculate required capacity: drying time × hourly processing capacity.
Example: For ABS material with a bulk density of 0.6 kg/L, 50 kg/hr of hourly processing capacity, and 3 hours drying time, it would be 50 kg/hr × 3 hrs = 150 kg
Include a safety margin of 1.2 so as not to overload the machine: 150 kg × 1.2 = 180 kg
Find out the hopper’s volume (litre):
Hopper size (Litre) = Loading capacity (kg) ÷ Material bulk density (kg/L)
For instance:
Therefore; Hopper size (Litre) =180Kg ÷0.6kg/ L=300L
Choose DH-300U for the hopper.
Determine HA airflow:
Calculate required airflow by unit drying airflow x hourly process capability.
Example: If ABS requires 1.8~2.4 m3/hr·kg, then ABS needs are as follows
50 kg/hr x2 .4m3/hr·kg=120m3/hr
Choose HA-200 for the dryer.
