preform injection molding machine

Quick Details

Condition: New
Application: Pipe
Plastic Processed: PE
Screw Design: Single-screw
Automatic Grade: automatic
Voltage: 380V 50 HZ
Power(W): 55KW
Dimension(L*W*H): 750*170*20(CM)
Weight: 13 TON
Certification: CE ISO
After-sales Service Provided: Engineers available to service machinery overseas
company: factory trade


Technical Parameters

Screw diametermm65
Max. theoretical injection capacitycm³880
Shot weigh PSg791
 max. injection pressureKg/cm²1750
max.plasticizing capacityKg/h163
max.theoretical injection ratecm³/s213
screw strokemm265
max.screw torqueKg.m220
screw speed ranger.p.m10-145
nozzle force/strokeTon/mm9.6/350
heating capacityKw21.75
screw L/D ratioL/D21.5
max. clamping forceTon300
max .opening strokeMm590
min-max mould thicknessMm230-580
max . distance between mould platensMm170
space between The bars "V×H"Mm630×630
 Mould platen size "W×H"Mm910×910
Ejector force/strokeTon/mm7/170
Ejector quantityPc(s)1 or 5
 pump motor powerKw30
 pump Q.MaxL/min160
machine size "L×W×H"M7.5×1.7×2.2
Machine WeightTon13



Process and Equipment

Equipment for injection molding evolved from metal die casting. An injection molding machine consists of two principal components:
(1) the plastic injection unit and
(2) the mold clamping unit. The injection unit is much like an extruder. It consists of a barrel that is fed from one end by a hopper containing a supply of plastic pellets. Inside the barrel is a screw whose operation surpasses that of an extruder screw in the following respect: in addition to turning for mixing and heating the polymer, it also acts as a ram which rapidly moves forward to inject molten plastic into the mold.
A nonreturn valve mounted near the tip of the screw prevents the melt from flowing backward along the screw threads. Later in the molding cycle the ram retracts to its former position. Because of its dual action, it is called a reciprocating screw, which name also identifies the machine type. Older injection molding machines used a simple ram (without screw flights), but the superiority of the reciprocating screw design has led to its widespread adoption in today's molding plants. To summarize, the functions of the injection unit are to melt and homogenize the polymer, and then inject it into the mold cavity

The clamping unit is concerned with the operation of the mold. Its functions are to
(1) hold the two halves of the mold in proper alignment with each other;
(2) keep the mold closed during injection by applying a clamping force sufficient to resist the injection force;
(3) open and close the mold at the appropriate times in the molding cycle.
The clamping unit consists of two platens, a fixed platen and a movable platen, and a mechanism for translating the latter.
The mechanism is basically a power press that is operated by hydraulic piston or mechanical toggle devices of various types. Clamping forces of several thousand tons are available on large machines.