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  • Hopper Dryer

Hopper Dryer

The Insulated hopper dryer adopts a down-blowing design and uses stainless steel material hoppers to avoid contamination. With this design, they are also ideally suited for use with honeycomb dehumidifiers to dry engineering plastics. Equipped with “hot air blowing” and “cyclone exhaust” function and double insulation barrel, the temperature can reach 200℃。

  • The microprocessor is used for accurate temperature control.
  • Digital P.I.D. temperature control with LED display.
  • Overheat protection to ensure reliable operation.
  • Safety protective ladder and Floor stand are standard equipment for model SHD-1500U and above.
  • Multiple optional accessories such as hot air recycler, magnetic base, and maintenance ladder, etc.
Hopper Dryer Good Quality
  • Yushine Insulated hopper dryer can efficiently dry most standard hygroscopic plastics to ensure high-quality molding products. The concise structure makes it easy to mount on the IMM, and the insulated drying hopper can also be directly mounted on the floor with the floor stand. Besides, there are multiple optional accessories to meet different production demands, such as hot air recycler, magnetic base, and maintenance ladder, etc.SHD-80U and the models above have a hopper maintenance door for easy and effective maintenance.
  • 80U and models above have hopper maintenance doors for ease and effective We offer various models of these dryers, all of which can be ordered online. For additional details, contact our team freely, as we’d be happy to help you.
  • Yushine is a professional manufacturer and supplier of insulated hopper dryers with over 15 years of experience.
  • 1-year warranty, Lifelong maintenance, and any feedback will respond in 24 hours.
  • Yushine dryers should 100% trial run and follow the quality control system strictly.

Send us your requirement, we will offer you a quotation as soon as possible.

All material contact surfaces are made of stainless steel to eliminate material contamination. Equipped with Microcomputer control, adopted P.I.D temperature control and LCD touch screen and RS485 communication function as optional.


Yushine Leading Hopper Dryer Manufacturer

Yushine is the professional enterprise of the domestic brand in plastic & rubber auxiliary machinery field like Insulated hopper dryers. We have many project cases with large-scale companies such as TTI, PHILIPS, Delonghi, Dorel Juvenile, and so on.

Since Yushine has over 15 years of experience in this industry. We assure you that all of our Insulated hopper dryers products are tested and certified in productions.

  • Yushine has passed the ISO9001 international quality system and most of our products have passed CE certification.
  • All the machines are a 1-year warranty, and any feedback will respond in 24 hours.
  • Strong abilities in developing and designing new machines that have passed patents for easy operating.
  • Short-time delivery and many products are in stock.
  • Yushine Concepts of “quality first, customers first, the credit first”.

Hopper Dryer | The Definitive FAQ Guide

The Hopper Dryer FAQ Guide is a free, easy-to-read guide with everything you need to dry various plastic materials using your Hopper Dryer successfully.

The guide contains information on hopper dryers, parts of hopper dryer, types of hopper dryer, technical specifications, the kind of plastic materials you can dry with your hopper dryer, and much more.

This guide will offer you practical information about hopper dryer that you will not find anywhere.

1. What Is A Hopper Dryer?

A hopper dryer, also known as a plastic dryer, is a drying machine commonly used in plastic extrusion and blow molding to rapidly and efficiently remove moisture from plastic pellets, flakes, granules, and powder.

The moisture content of the pellets is referred to as their “raw moisture content.”

The raw moisture content will vary from material to material, with common values being 4-6% for PVC pellets, 6-10% for ABS pellets, and 10-15% for PS (Polystyrene) pellets.

Hopper Dryer

When you refer to “raw moisture,” it does not mean the moisture that is chemically bonded to the molecules of the resin but what is left over once all of the water that has chemically bonded to the molecules has been removed.

The process of drying these materials removes any water that has chemically bonded to them.

In this way, the positive properties of the raw material can be preserved as accurately as possible. An up-to-date hopper dryer guarantees an optimal cost-performance ratio in your process as well as maximum flexibility concerning variations in mass production.

A Hopper dryer is the most commonly used equipment in the plastic industry. The most important benefit that this device provides you is the quality product.

Hopper dryer reduces the labor requirements and replaces the conventional drying methods. This will speed up the drying process and increase your productivity.

2. What Is the Working principle Of Hopper Dryer?

The working principle of your hopper dryer is as follows: The main drying medium that a hopper dryer utilizes is hot air. First, the ambient air enters the equipment and passes through a filter.

After passing through a filter, it reaches a blower that directs this air stream to the desiccant material, removing any moisture if present. Later the air will pass through a heater where the air becomes hot.

This hot air then moves through a duct located at the bottom of the hopper, which is cylindrical shaped. This forces the air through the plastic pallets, flakes, or granules.

The hot dried air then absorbs the moisture content from the plastic materials and gets rich in moisture. The moisture-rich air is then subjected to the air filter.

After passing through the air filter, the air is directed towards the after-air cooler, which lowers the temperature of moisture-rich air.

After this, the air passes through the desiccant rotor, which continues this never-ending cycle. Remember that the desiccant rotor is optional and varies depending on the model of hopper dryer you are going to select.

3. How Hopper Dryer Is Beneficial In Injection Molding and Extrusion Processes?

Injection molding is used to mass-produce parts, components, and products. It uses high pressure to mix melted materials with the use of heat. The molten substance is then injected into a mold, where it cools off, hardens, and becomes the final product.

Mold filling is the most important process in injection molding. The filling period includes preheating, melting, injection, and post-heating.

The Hopper Dryer plays a crucial role in the injection molding process. It is used to remove the moisture from different plastic materials injected into the molding machine. The drying process takes place before the parts are transferred to an oven.

Hopper dryer is also an integral part of the extrusion process. If it does not have a hopper dryer, it won’t be easy to extrude plastic efficiently.

The Hopper Drier is used to reduce the moisture content of extruded plastic pellets before they are processed into finished parts. This process provides an uninterrupted flow of raw materials for all extrusion processes.

4. How Many Kinds Of Hopper Dryer In Yushine Company?

Yushine company offers various types of hopper dryers. The major types of hopper dryer that yushine offers include:

Hot Air Hopper Dryer

A hot air hopper dryer is used to dry plastic granules by allowing the hot air to pass through the material placed within a hopper. In this dryer, the temperature can reach up to a 1600C.

 Hot Air Dryer

It does not consume a lot of energy, thus cutting your expenses. You can use it 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 double insulated. This increases the efficiency and effectiveness of the drying process.

 Insulated Hopper Dryer

No heat losses associated with insulated hopper dryer. The temperature in this type of hopper dryer reaches up to 2000C. This temperature means the speed-up drying phenomenon, which ultimately increases your productivity. This is the core requirement of the plastic industry.

You can choose any one depending on your needs and requirements.

5. What Are the Main Parts of Hopper Dryer?

Various parts, when combined, make up your hopper dryer. Without a single of these parts, your hopper dryer will be unable to perform its function. These components include:

Air Filter

Air filters are one of the most important components integral to the smooth operation of hopper dryers. It helps maintain a better airflow which indirectly prevents any accumulation of lint and dust inside it. This elongates the life of the hopper dryer.

Air Filter


The primary benefit of a hopper dryer is the circulation of dry, hot air into the hopper. These blowers consist of scroll compressors and fan motors to effectively circulate the air. This circulation causes moisture to evaporate, so less water remains inside the grain and generates a higher quality product at the end of drying.



The heater is the essential component of the hopper dryer. It contains a programmable timer, power density, and excess temperature control. The main role of the heater is to raise the temperature of the air when it passes through it. You can specify the temperature or set its value. This will help you speed up the drying while also giving you control to prevent excessive temperatures.


6. How Insulated Hopper Affects the Efficiency of Hopper Dryer?

The demand for plastic products is on a constant rise. Due to the expansion in the number of manufacturers, there comes an increase in the production rate. The increased production has limited space in the machinery that works with plastic pellets.

An insulated hopper dryer has been designed, keeping such constraints in mind. It reduces production costs, helps save energy bills, and cuts back on maintenance costs.

Most hopper dryers are uninsulated models which use high energy to heat air, which induces a lot of heat loss in the process.

Insulated hopper dryers use less energy to heat the air and retain that heat for longer. Such dryers are designed to eliminate the common issues that most uninsulated designs face.

An insulated hopper dryer keeps your material or product at an even temperature to ensure no uneven heating. The temperature range of this hopper dryer is greater than uninsulated hopper dryers. This will help you dry your products in bulk quantity and less time, thus increasing production efficiency.

7. What Are the Technical Specifications of Hopper Dryer?

Multiple specifications associated with hopper dryer. Major specifications include:

ModelDimension (mm) (H) X (W) X (D)Weight (KG)Process Blower (KW)Drying Heater (KW)Hopper Capacity (L)Floor Stand (mm) (H) X (W) X (D)Total Height (mm)Blower Inlet (inch)Blower Outlet (inch)
SHD-20 U680 x 575 x 325400.052.220790 x 450 x 550126021.5
SHD-40 U770 x 770 x 394700.12340790 x 580 x 450130021.5
SHD-80 U940 x 860 x 472850.123.980840 x 730 x 56014802.52
SHD-1200 U1190 x 860 x 4721000.123.9120840 x 730 x 56017402.52
SHD-160 U1200 x 875 x 575900.126160920 x 652 x 795182532.5
SHD-230 U1470 x 875 x 5751000.126230920 x 652 x 795210532.5
SHD-300 U1430 x 1005 x 6951300.1812300970 x 790 x 930208532.5
SHD-450 U1840 x 1005 x 6951600.1812450970 x 790 x 930243532.5
SHD-600 U1830 x 1250 x 9152000.55186001130 x 1000 x 1200247043
SHD-750 U2080 x 1250 x 9152200.55187501130 x 1000 x 1200278043
SHD-900 U2330 x 1410 x 10504100.55189002760 x 1130 x 1130276544
SHD-1200 U2765 x 1410 x 10505601.12412003190 x 1145 x 1145319044
SHD-1500 U3095 x 1640 x 125068533215003470 x 1340 x 1340347055
SHD-2000 U3685 x 1542 x 125077033220003870 x 1340 x 1340387055
SHD-2500 U3735 x 1798 x 14008005.55825004000 x 1482 x 1482400066
SHD-3000 U4135 x 1798 x 14009005.55830004400 x 1482 x 1482440066
SHD-3500 U4535 x 1798 x 140010107.56435004800 x 1482 x 1482480066
SHD-4000 U4180 x 2010 x 160011607.56440004550 x 1680 x 1680463588
SHD-5000 U4775 x 2010 x 16001390118050005150 x 1680 x 1680523588

8. Why You Need A Hopper Dryer?

There are many reasons which reflect that you need a hopper dryer. If you have a production plant that requires the removal of moisture content, then a hopper dryer is your go-to choice.

The conventional drying methods decrease your drying speeds and do not effectively remove the moisture from various plastic materials.

If the moisture is not removed from the material, then the end products you will form possess bad quality. The bad quality may be due to air bubbles formed on the surface of the end product, deformation in the product’s structure, and less working life.

All these issues related to a product result in wastage of material and wastage of time. Your brand name also suffers because of poor-quality end products. Therefore, to cope with these issues, you need a hopper dryer.

9. What Are the Materials Used in Making of Hopper Dryer and How They Affect the Life of Hopper Dryer?

Several different materials are used in the production of hopper dryers. Each material has a specific role. Some of the main materials include:

Stainless Steel

Stainless steel is the most important and mandatory material in constructing the hopper dryer. Hopper, frame and ducts use stainless steel material. Stainless steel is a low-cost, tough, and corrosion-resistant material. You can use it in hopper dryers to protect the heating components and extend its service life.


The temperature display and electric components are made up of high-quality plastic. This material resists harsh and tough environments and contributes to a longer life by providing waterproof, dustproof, and heat resistant features.


The wiring of Hopper Dryers uses Rubber mainly because of its Heat Resistant Properties, Corrosion Resistance, Flexibility, and Low Cost. As the electric current needs to flow through these wires, the Rubber provides great insulation and prevents any accident.

10. What Are the Applications of Hopper Dryer?

Several different applications exist for hopper dryers. Some of the main applications include:

The plastic industry uses this product to remove the moisture from material so that the end products are of high quality. The pharmaceutical industry utilizes hopper dryers to produce high-quality drips, syringes, oxygen masks, and much more.

The food industry uses a hopper dryer to completely dry out recyclable plastic products, including disposable glass, tea mugs, plates or spoons, and much more.

Different beverage products, including recyclable glasses and beverage containers, also utilize hopper dryers in their manufacturing process. You cannot ignore the importance of hopper dryers in these industries.

11. What Plastic Polymers or Materials Do You Dry Using Your Hopper Dryer?

Multiple materials you can dry using your hopper dryer. Some of the main materials include:

ABS (Acrylonitrile Butadiene Styrene)

ABS is a synthetic polymer widely used in manufacturing to be molded into almost any shape. It’s fairly easy to develop and yet very durable. The versatility that comes from this unique property makes it the most commonly used plastic and one of the most widely used manufactured materials.

PP (Polypropylene)

Polypropylene is a thermoplastic polymer produced from the polymerization of propylene. It is used in various applications, including films, bottle caps, packaging, injection molded parts, and lids for food and beverage cans. Hopper Dryer is a virtual machine in the production line for drying polypropylene.

PS (Polystyrene)

PS (Polystyrene) or poly(styrene) is a synthetic aromatic polymer made from monomer styrene. It is one of the most widely used plastics. PS is an alternative to most plastic materials when making a wide range of products like Electronic items, Furniture products, Shoes, and toys.

12. How A Microprocessor Help You Control the Operation of Hopper Dryer Precisely?

Did you ever wonder how microprocessors can help in a hopper dryer? With the help of this advanced technology, Hopper Dryer becomes more accurate and efficient. It allows you to control the operation of your dryer easily and precisely.

The microprocessor is a digital electronic computer on a single integrated circuit or chip that contains many electronic components, including multiple electronic digital logic circuits.

The function of the microprocessor is to perform a small set of interrelated tasks. It allows you to automatically control and determine the drying time, temperature, and air flow.

The microprocessor is in the control brain of the Hopper Dryer. The microprocessor also processes the information from various sensor inputs.

You don’t need to worry when you have this microprocessor in your hopper dryer. It keeps everything in control, thus obtaining a qualitative product you need.

13. How Air Filter Contributes to The Material Purification in Hopper Dryer?

The air filter is an important part of the hopper dryer. It is used to purify the air of bacteria and dust particles to achieve a better drying effect. Air enters the hopper through the grating, leaving most foreign matters stuck in the filter.

It prevents these contaminants from harming your hopper dryer and the material you will dry with it. In this way, the material you obtain from the hopper is completely purified and cleaner.

The air filter needs cleaning frequently and the replacement of the filter. The cleaning time of the filter varies and depends on the quality of material you will dry. If the material contains more dust particles, you need to clean your filter more often.

Without the Hopper Air Filter, the fumes from the heating process would be difficult to control, and it would not be possible to achieve an efficient, pollutant-free drying environment.

14. What Steps did You Need to Follow to Select the Best Hopper Dryer Supplier from China?

Chinese hopper dryer supplier is the best supplier because they offer you high-quality products at a reasonable price.

The process of finding the hopper dryer begins with qualitative research. First, you need to find the suppliers by searching online. Visit different marketplaces and find the supplier who manufactures the products you are looking for.

Find out 10 to 15 suppliers who are supplying your products. Now visit their websites to shortlist 3 to 5 out of them. Carry out the comparison based on product features, specifications, prices, etc.

Please read the product reviews and feedback of customers about their products to have a better idea about the supplier’s credibility.

Now arrange an online meeting with your supplier to discuss the terms and conditions. During the meeting, please inquire about the delivery times, concession on their products, and anything you have in mind.

This will help you in making a clear decision about your supplier. Now select that supplier who fulfills your terms and conditions.

15. Why Choose Yushine’s, Hopper Dryer?

Yushine’s offers a high-quality hopper dryer made of the best materials from reputable suppliers or brands.

This makes Yushine’s hopper dryer stand out from the competition. This hopper dryer has a microprocessor embedded, preventing the temperature from rising beyond a specific limit.

You can easily carry out the maintenance and cleaning process with the help of a maintenance ladder. The life associated with Yushine’s hopper dryer is long, and they offer you a warranty of about one year.

The Yushine’s hopper dryer is both reliable and affordable, making it a perfect choice for you to cope with your industry needs.

16. What Factors Affect the Drying Time of Hopper Dryer?

Multiple factors affect the drying time of material within a hopper dryer. Some of these factors include:

Moisture Content

The moisture content plays a very important role in the drying time of material in Hopper Dryer. The moisture content of the material depends on the amount of water present in the material. When the moisture content is high, it causes a longer drying time for the material.

Drying Temperature

The temperature has a profound effect on the drying time in Hopper Dryer. The higher the temperature, the shorter the drying time (and lower the cost of energy consumption). The lower the temperature, the longer it takes for the material to be dry (and the higher the cost of energy consumption). It also depends on the type of material you are drying with it.

Material Quantity

If the quantity of material is greater, you will need more time to dry it completely. On the other hand, less material will allow you to make it dry in less time.

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