Harden machinery Co., Ltd. supply hydraulic power station for hydraulic screen changer, hydraulic power station’s maximum working pressure is16MPa. Single power station can drive one or more hydraulic screen changer. Hydraulic power station selection according to the size of the hydraulic cylinder. Power station generally only drive one hydraulic screen changer at the same time when runing . Harden also customized hydraulic power station according to customer requirements.

Specification of hydraulic power station:

Model	Accumulator	Oil Tank
HU1	4L	40L
HU2	6L	60L
HU3	6L	80L

Harden industry Co. Ltd can make strand die for single screw and twin screw extruder according to customer special requirments. number of strand up to 60. The mold is easy to disassemble and clean, especially suitable for the production of small and medium masterbatch that the product and color will change frequently, and suitable for recycling pelletizing production also.

Harden machinery Co., Ltd. can also be based on user’s demand, according to different types of plastic, rubber or ceramic materials, as well as the melt pressure and melt temperature, custom breaker plate and the mold flange plate.

Diverter valve (or converter valves) is usually installed in medium and large-scale polymer production line, use for dumping the degrade and unqualified polymer out of extruder when restart the machine after shutdown, but not through the mold; or rise the function of discharging flow when the mold are blocked up.

The valve core stay in the upstream when the production line run normally; when the extruder need to change flow, the hydraulic cylinder driving the valve core move up , in a second change to the downstream. Th melting material flow to the ground or a container from discharge port of valve core.

This compact, small size valve, usually installed between screen changer (mold) and extruder. Driving by hydraulic, can quickly dumped or diverted melt. They can use the same hydraulic pump with screen changer. The diverter valve heating by electricity, install with adjustable metal seal. For new or existing production lines, we can design and manufacture the adapter to connect the divert valve to other parts of the production line.

Specification of Diverter valve:

Model	Capacity
HV65	5000 kg/h
HV90	12000 kg/h
HV120	18000 kg/h
HV150	25000 kg/h
HV200	36000 kg/h

Harden rely on South China Univercity Of Technology–National Engineering Research Center Of Novel Equipment For polymer Processing, using of advanced research methods, successfully developed the HC-Type melting screen changer.

The principle of changer is scientific, owning novel structure and function practical, using a candle filter with double flow channel, available to overcoming variety of shortcomings of screen changer in this market , needn’t to stop the main or auxiliary equipment in the producing line when change screen, the pressure of melt stream small fluctuate, so that ensuring continnous producing without problem.

More importantly, the effective filtration area is large that it can meet the wide range of materials. For the first time it needn’t to stop the line when using renewable materials to produce flat wire and thin film type production. improving production efficiency, reduce costs, meet customers requirements.

Characteristic of structure:
• Automatic screen changer use filter with double flow channel, When one of channel is changing screen, melting material can pass the other channel as normal. Reasonable structure and advanced runner design ensuring the pressure of melting material fluctuate in a small range (≤0.5MPa), do not affect the dimensional accuracy of Film type products, do not affect the normal operation of the production line.
• Automatic screen changer has original structure, the action in and out of screenpack also play the role of pass or cut-off the melting material when changing screen. The structure of whole screen is compact, action is reliable, and easy to operate.
• Automatic screen changer use the structure of candle screenpack. the effective filtration area is large, the projected area in the melting material direction is small, the force structure is small. Safety and reliable. Using stainless steel screen which easily find in the market, low-cost.
• The parts of automatic screen changer use special structures and materials, thermostable, durable, long life, there is no need to maintain basically during the term of using.
• Automatic screen changer use the finite element method to measure the strength and rigidity of structure. Ensuring the changer has excellent quality.
• Use PLC to control, automatic change srceen , ensure pressure stable.

Application range:

HC-type automatic srceen changer apply to flat-wire drawing machine, casting film machine, blowing film machine and plastic processing machine. Suitable for these material, including: common plastic PP and PE, some part of PS and PET, as well as renewable material we mention above.

Specification of isobarically screen changer:

Model	Capacity
HP65	150 kg/h
HP90	500 kg/h
HP135	600 kg/h
HP160	850 kg/h

Harden manufacture single-piston and dual-piston continuous screen changer, screen diameter from 30mm to 200mm, can choose a structure of 2 or 4 breaker plate to meet the requirements of any production process. Piston type continuous screen changer applies to most polymers and various viscous fluid, single-piston screen changer can be made in continuous or discontinuous, the dual-piston continuous screen changer have four filter flow, there is one filter working at least when screen changing, it can work without a interruption the melt flow and exhaust air when the breaker plate conjuncte with the runner. Two slide plate move slowly, so that prefill the polymer melt into breaker plate, thus ensuring a small fluctuation of extrusion pressure.

Specification of hydraulic slidepiston screen changer

• Pressure resistant up to 45Mpa.
• Temperature of melt achieve 320oC
• Continuous working, needn’t to stop line when changing screen.
• Air would’t enter the melt flow when screen changing .
• Small fluctuation of pressure.
• Wouldn’t touch seal stuff.
• Firm and durable structure.

Application range of hydraulic piston screen changer:

• Sheet extrusion.
• Extrusion coating.
• Profile/tube extrusion.
• Compounding extrusion.
• Cable extrusion.
•Flexible pipe extrusion.
• Lab extrusion.
• Textile(Fibre and non-woven).
• Extrusion pelletizing(Strand and under water pelletizing).
• Blowing film and casting film extrusion.
• EVA, thermoso and self adhesive label, (PSA) material.
• Easy degradation material.
• FPVC and high corrosive material extrusion.

Specification of single-piston type screen changer:

Model	Capacity	Pic of single-piston type
HP30	60 kg/h
HP45	100 kg/h
HP65	150 kg/h
HP90	500 kg/h
HP120	600 kg/h
HP150	850 kg/h
HP200	1250 kg/h

Specification of dual-piston type screen changer:

Model	Capacity	Pic of dual-piston type
HB30	100 kg/h
HB45	150 kg/h
HB65	200 kg/h
HB90	800 kg/h
HB120	1000 kg/h
HB150	1400 kg/h
HB200	1800 kg/h