Chinese Manufacturing Companies' Day

3:06PM - Rhong Machinery

NINGBO Beilun Rhong Machinery Manufacturing Co., Ltd. is specialized in the manufacturing of auxiliary equipments for plastics molding machine located in Ningbo city, China. Our equipments  include Plastic Granulator,Plastic Crusher,Hopper Dryers, Vacuum Auto-loaders, Mixing Machinery, granulators,dehumidifiers,temperature controller, industrial chillers and the central feeding system. Our equipments are widely used in various industries including electronics, household appliances, CDs, building materials, packaging, beverage, medical industry and so on.

We have a R&D team of senior engineers with experience of more than five years. We make continuous efforts in the research and development of advanced equipments. Our design idea is nice appearance, high efficiency, stable performance, easy operation and safe using.

We pay much attention in quality control. From incoming material and components, to finished products, the quality is checked at every process of production. We believe Quality is the life of our enterprise.

News & keywords:Tubing coupling,Stock hopper, The plastic crusher of our company have many advantages

We provide best equipments and industrial solution for plastics fabrication. We warmly welcome the clients from all over the world to enqire about our equipments. We will give you satisfied reply in soonest time.

3:22PM - Operation Principle of Cabinet Dryers

In a cabinet dryer, the feed is loaded onto trays that, depending on the required quantity of material to be processed and hence dryer size, are loaded onto trolleys or inserted into the drying chamber. The door is closed, sealing the system. The trays may have a solid or perforated bottom, depending on the feed particle size distribution. The carrier (typically, air) is drawn in through an inlet duct or recycle channel into the heating compartment. The air is heated to the required temperature in this region, then distributed from side-to-side (cross-flow) or bottom-to-top (through-the-bed flow) in a circular motion, according to specific drying requirements.

The motive force for the air movement typically is a plug-type fan that acts as both an induced draft and forced draft machine. The fan sucks the air through the heating chamber and blows it across the trays, which act as channels or ducts to direct the air. The fresh air inlet is located on the suction side and the exhaust is located on the pressure side. The inlet and typically exhaust will have dampers on them, enabling the percentage of recycled air to be controlled. This recycle improves the efficiency of the unit operation, conserving energy in the gas stream.

Cabinet dryers come in various sizes and may have multiple fans on larger units. Carninet Dryers also may be more than one heating compartment. Units can be electrically heated, have gas or LFO heat sources, or use indirect heat sources such as steam or thermal oil.

Cabinet dryers can dry all types of feeds from liquids and slurries to granules, agglomerates and solids (objects). Next month, I will look at dryer loading and unloading, residence time, ancillary systems and potential operating drawbacks.

3:28PM - Industrial Chiller Technology

Industrial chillers typically come as complete packaged closed-loop systems, including the industrial chiller unit, condenser, and pump station with recirculating pump, expansion valve, no-flow shutdown, internal cold water tank, and temperature control. The internal tank helps maintain cold water temperature and prevents temperature spikes from occurring. Closed loop industrial chillers recirculate a clean coolant or clean water with condition addititives at a constant temperature and pressure to increase the stability and reproducibility of water-cooled machines and instruments. The water flows from the industrial chiller to the application’s point of use and back.

If the water temperature differentials between inlet and outlet are high, then a large external water tank would be used to store the cold water. In this case the chilled water is not going directly from the industrial chiller to the application, but goes to the external water tank which acts as a sort of “temperature buffer.” The cold water tank is much larger than the internal water tank. The cold water goes from the external tank to the application and the return hot water from the application goes back to the external tank, not to the chiller.

The less common open loop industrial chillers control the temperature of a liquid in an open tank or sump by constantly recirculating it. The liquid is drawn from the tank, pumped through the chiller and back to the tank. An adjustable thermostat senses the makeup liquid temperature, cycling the industrial chiller to maintain a constant temperature in the tank.

One of the newer developments in industrial water chillers is the use of water cooling instead of air cooling. In this case the condenser does not cool the hot refrigerant with ambient air, but uses water cooled by a cooling tower. This development allows a reduction in energy requirements by more than 15% and also allows a significant reduction in the size of the chiller due to the small surface area of the water based condenser and the absence of fans. Additionally, the absence of fans allows for significantly reduced noise levels.

Most industrial chillers use refrigeration as the media for cooling, but some rely on simpler techniques such as air or water flowing over coils containing the coolant to regulate temperature. Water is the most commonly used coolant within process chillers, although coolant mixtures (mostly water with a coolant additive to enhance heat dissipation) are frequently employed.

3:30PM - Plastic Granulators

A plastic granulator operates much like a large shredder. It turns full sized bottles, jugs, and other plastic products into flakes, or granules. The material produced by the plastic granulator is later sold to molders and manufacturers of plastic products as recycled raw material. The recycled raw material can be used to make new plastic items. Aside from aluminum and glass, plastic is the only material capable of being reprocessed into new items that are of the same quality as the original.

A plastic granulator is comprised of a large electric motor that turns a rotor. Cutting blades are attached to the rotor and encased within a closed chamber. These blades and chambers are available in numerous shapes and sizes. When used plastic material is placed inside the chamber, the rotating blades shred it into granules.

A screen is also located inside the chamber. It serves as a shifter, ensuring the plastic is small enough to be resold. If the plastic pieces are larger than .125 to .375 inches (0.318 to 0.953 centimeters), they are reprocessed until they are small enough.

A plastic granulator is rated by pounds per hour, which refers to how much it can shred within an hour. For industrial recyclers, the chamber of the plastic granulator needs to be large. It is, however, possible to purchase a plastic granulator for home or small business use. It is important to note that these machines can be a dangerous, no matter how small. Therefore, it is important to follow the precautions provided by the manufacturer.

3:31PM - Hopper Dryer

The hopper dryer of the present invention of a double cylindrical body type which has a heat source at its center is constructed such that both the inner cylinder and the outer cylinder can be removed when the upper part is detached. Therefore, the hopper dryer  is easy to disassemble and the body cleaned. This capability is useful especially when the resin materials are frequently exchanged.

As the hopper dryer of the present invention is constructed so as to be concentric with the heat source disposed at the center of body, a substantially larger storing space for resin materials can be attained as opposed to the conventional type of hopper dryer  in which the heat source is disposed peripherally.

What is claimed is:

1. A hopper dryer, comprising a main body casing having: 2. an outer cylindrical body; 3. double walls spaced externally of said outer cylindrical body, said double walls comprising an inner wall and an outer wall which form an insulation air layer between them; 4. an inner cylindrical body; 5. heating means situated within said inner cylindrical body; 6. an upper casing, said inner cylindrical body and said heating means mounted to said upper casing.