HDPE PP LDPE underwater strand recycling pelletizing machine
WHEN TO GO UNDERWATER
When the preferred pellet shape is more spherical than cylindrical, the best alternative is an underwater hot-face cutter. With a capacity range from from about 20 lb/hr to several tons/hr, this system is applicable to all materials with thermoplastic behavior. In operation, the polymer melt is divided into a ring of strands that flow through an annular die into a cutting chamber flooded with process water. A rotating cutting head in the water stream cuts the polymer strands into pellets, which are immediately conveyed out of the cutting chamber. The pellets are transported as a slurry to the centrifugal dryer, where they are separated from water by the impact of rotating paddles. The dry pellets are discharged and delivered for subsequent processing. The water is filtered, tempered, and recirculated back to the process.
The main components of the system-cutting head with cutting chamber, die plate, and start-up valve, all on a common supporting frame-are one major assembly. All the other system components, such as process-water circuit with bypass, cutting chamber discharge, sight glass, centrifugal dryer, belt filter, water pump, heat exchanger, and transport system can be selected from a comprehensive range of accessories and combined into a job-specific system.
In every underwater pelletizing system, a fragile temperature equilibrium exists within the cutting chamber and die plate. The die plate is both continuously cooled by the process water and heated by die-head heaters and the hot melt flow. Reducing the energy loss from the die plate to the process water results in a much more stable processing condition and increased product quality. In order to reduce this heat loss, the processor may choose a thermally insulating die plate and/or switch to a fluid-heated die.
Many compounds are quite abrasive, resulting in significant wear and tear on contact parts such as the spinning blades and filter screens in the centrifugal dryer. Other compounds may be sensitive to mechanical impact and generate excessive dust. For both of these special materials, a new type of pellet dryer deposits the wet pellets on a perforated conveyor belt that travels across an air knife, effectively suctioning off the water. Wear of machine parts as well as damage to the pellets can be greatly reduced compared with an impact dryer. Given the short residence time on the belt, some kind of post-dewatering drying (such as with a fluidized bed) or additional cooling is usually required. Benefits of this new non-impact pellet-drying solution are:
•Lower production costs due to long lifetime of all parts coming into contact with pellets.
•Gentle pellet handling, which ensures high product quality and less dust generation.
•Reduced energy consumption because no additional energy supply is necessary.
water ring PP PE plastic flakes pelletizing machine could Extruding the waste plastic into granulator,cooling and cutting. Waste plastic materials included: polyethylene (greenhouse film,PET bottle, lined bag) or Polypropylene(old film bag, packing belt, bundle rope, non-woven fabrics). This Double-Step Granulating Machine used widely,is preferred models of the Plastic Recycling Industry.
PROCESS FLOW:
Film →conveying feeding→film compacting →degassing single screw extruder →hydraulic screen exchanger →material outing mould→single screw extruder →hydraulic screen exchanger →rub surface granulating machine →slip though →centrifugal machine → vibrating screener →blowing system →storage hopper → finished product packing
Main parameter of the pelletizing line:
Model |
Screw diameter
(mm) |
L/D |
Motor power
(kw) |
Vibrate sieve
(kw) |
Blower
(kg) |
Capacity
(kg/h) |
SJ90 |
90 |
28-36 |
37-55 |
0.25kw x2 |
1.5 |
80-120 |
SJ100 |
100 |
28-36 |
55-75 |
0.25kw x2 |
2.2 |
120-180 |
SJ120 |
120 |
28-36 |
90-110 |
0.37kw x2 |
3 |
200-300 |
SJ130 |
130 |
28-36 |
110-132 |
0.37kw x2 |
3 |
280-350 |
SJ150 |
150 |
28-36 |
132-160 |
0.55kw x2 |
4 |
400-500 |
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