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Research & development of New technology and New Product

                                    High-efficiency and energy-saving reciprocating co-kneader and pelletizing extruder unit

Cenmen company optimized and upgraded the first large-scale GWHS/PVC-150/300 type reciprocating co-kneader, with a single-machine output of 5-6 tons/hour, meeting customers' higher requirements for compounding and modification.

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GWHS/PVC-150/300 reciprocating single-screw compounding and extrusion equipment structure:

lThe screw has four flights, the four rows of pins in the barrel are inserted into the screw, and the screw reciprocates in the axial direction, and the reciprocating distance ratio is 4.8.

lThe interaction between the screw and the pin performs instantaneous high-frequency shearing, splitting and shunting of the material, as well as continuous overturning, kneading and stretching.

lThe material on the unit length of the screw is mixed 4 times for ezch rotation of the screw, which greatly improves the effect of dispersion mixing and distribution mixing.

GWHS/PVC-150/300 reciprocating single-screw compounding extruder features:

lThe PLC controller cooperates with the HMI man-machine interface for centralized control; the automatic batching control accuracy can reach 3‰.

lThe power consumption ratio is 0.12-0.15kw.h/kg, which saves 35-40% energy compared with other twin-screw extrusion equipment.

lIt is used in the compounding, extrusion and granulation of PVC cable material, and the output can reach 5-6t/h. 

Typical application of Reciprcating single screw compounding extrusion equipment:

Wire and cable material typical application:Low smoke halogen free cable material; Peroxide XLPE cable material; Silane XLPE cable material; Semicon & shield cable material; PVC insulated cable material, PVC sheathing cable material.

Filling material and other industries typical application: lFully biodegradable material; Highly filled masterbatch (calcium carbonate, talc, Titanium dioxide); Fiber masterbatch: polyester, polypropylene; High concentration black masterbatch, color masterbatch, functional masterbatch, etc; Powder coatings, thermosetting plastics, phenolic molding compounds, powder metallurgy, etc; Polymer: epoxy resin, acrylic resin, amino resin, polyester, etc.

It has been sold 2 sets to well-known packaging material companies in 2021, and has also sold to many well-known companies in the cable industry.

                                 


                                                         New type continuously polymerized extrusion equipment

In the polymer synthesis industry, the common reaction equipment is a stirred reactor. In view of the problem that it is difficult to deal with high- viscosity materials or large volumes in conventional reactions/ devolatilization of vertical stirring reactors,, our company has designed and developed a continuous horizontal reactor. This new horizontal reactor is a high-efficiency, high-economical Sexual reaction or devolatilization equipment.

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Equipment process: liquid and solid phase metering and feeding of monomers and additives → premixing and homogenization → prepolymerization/ final polymerization → termination reaction / deep devolatilization → extrusion pelletizing / tableting / packaging. 

     Process

               Typical application

                                      Production features

various of

polymer

materials

polymerization

 

 Polycondensation or other bulk polymerizatio, like: PBAT, PLGA, PET, PMMA, trans-butadiene rubber, PGA, PLA, PCL, bukk polymerization ABS etc.


The continuous production process of the horizontal reactor has high production efficiency andstable product performance.

During the polymerization, the temperature gradient is small, the

residence time is short, the molecular weight distribution is narrow, the polymerization yield is high, and it is easy to obtain high molecular weight polymers

Solvent polymerization: various

of synthetic rubber, TPE, etc. 



                                          New type high solvent(content 30~90%) devolatilization equipment

In view of the need for devolatilization treatment of high polymer solvent (content 90%), our company has developed a new SCP/TSD devolatilization equipment.

The equipment not only has the functions of heat transfer & evaporation, devolatilization & drying of the traditional reactor, but also has the excellent functions of dispersing &mixing and shearing & kneading of the twin-screw extruder. At the same time, the batch production mode of the reactor is transformed into continuous online production. Continuous reaction devolatilization can be completed under the following different working conditions and requirements: temperature change; pressure change; viscosity change; additive addition; discharge conveying; deep devolatilization; mixing modification of batch; extrusion pelletizing. 

            Process

              Typical application

                                         Production features

Large-volume polymer

devolatilization (50-80%

volatile content)

   Polymer, synthetic rubber or elastomer solvent remova, like:hydrogenated nitrile rubber,POE elastomers, various of styrene-butadiene copolymers,butyl rubber, SBS/SEBS/acrylates,etc.

During the   viscosification process of high solvent (30-90%), in a short time (20-50minutes), the high-solvent gas phase conversion, devolatilization, and condensationrecovery can be completed,and at the same time, the deep devolatilization discharge of high-boiling polymerization residual by-products can be continuously completed. (volatilematter content after

devolatilization is 0.03-0.5%)

Residual monomers removal:like,

PPC resin, silicone rubber, etc.

 


                                                New type of three-stage screw recycled rubber desulfurization refining equipment

The traditional dynamic desulfurization and refining equipment has the following shortcomings:

1.The traditional dynamic desulfurization method adopts high temperature and high pressure and adds water and other auxiliary materials. Among them, water easily reacts with sulfur, carbon black and other substances under high temperature and high pressure conditions to generate a large amount of harmful waste gas and wastewater. Improper treatment will cause great harm to the environment.

2.Since the dynamic desulfurization process requires high temperature and high pressure conditions, long-term work will make the outer wall of the pressure vessel thinner. Reliability will be reduced, and there will be security risks.

3.The principle of dynamic desulfurization method is to denature rubber macromolecules under high temperature and high pressure conditions. This reaction needs to be maintained for a certain period of time to realize the reduction of rubber, so the production process is time-consuming. At the same time, maintaining high temperature and high pressure for a long time will also consume a lot of energy.

4.The volume of the tank used for desulfurization is large, and the desulfurization process cannot make it heated evenly. After long-term use, there will be a large amount of rubber residue and scaling, which will affect the quality of the rubber produced.

Our company designed a new type of three - stage screw rubber desulfurization and refining equipment:

1.Three-stage single-screw design: Since each stage of the rubber desulfurization process has different requirements for temperature and shear force, different stages are completed by different single-screw extruders. In the first stage, the single screw is preheated first to avoid local carbonization caused by rapid temperature rise; in the second stage, shear heating is performed to destroy the chemical bonds of sulfur molecules; Good mechanical properties of rubber.

2. There is no need to add water in the production to avoid water pollution.

3.Special cooling design of screw core part

4.The barrel is equipped with adjustable shear pins

5.Multi-stage twin-screw press exhaust machine

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                                                             New type of drying(without touching water) strand pelletizer

For the production process of resin polymerization pelletization and resin kneading modification pelletization of polymer materials, the general die face hot cutting method cannot complete the pelletization of high-viscosity resin materials, so the currently commonly used method is water-contact cooling pelletizing(underwater pelletizing, water-strand pelletizing, etc.). However, for polyester materials with water-sensitive properties, water contact will cause hydrolysis reaction, and will seriously reduce material properties. Moreover, the water contact pelletizing process generally needs to strengthen the drying process of finished particles, which increases the comprehensive production energy consumption and process complexity of the production line. In addition, although the air cooling conveying strand pelletizing is also a water-tree process, it has disadvantages such as low output, excessive equipment length and high operational complexity and instability. Smoke produced by the air cooling process is not conducive to the requirements of green production.

Through the research on the water-sensitive characteristics of polyester materials and the creation of an effective adaptation of the pelletizing process, the structure principle of the new type drying (no water) strip-cutting pelletizer  designed by our company: using water cooling roller set for cooling heat exchange; special design of cooling slitting pelletizing device; wide-width feeding pelletizer.

Features: new type drying(without water) cooling pelletizing; high-yield process configuration; high efficiency, energy saving and environmental protection; optimized operation control system (overall configuration design, production line speed, temperature control, cooling capacity and other parameters are set using linkage control system, for efficient operational control).


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