outlet hose blow molding machine
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Drain pipe bellows outlet hose blow molding machine

process steps of extrusion blow molding are (Figure 2.1):

  • Plasticizing and preparation of the thermoplastic melt in an
  • Diversion of the melt into a vertical downward flow and forming a tubular melt “parison”. This parison is produced in the so-called parison head (also called blow head, die head, or just briefly head).
  • A mold (blow mold), usually consisting of two half-shells, is closed around the parison hanging freely under the head and squeezes it at both ends (top and bottom).
  • Insertion of a blow pin or (possibly several) blow needle(s).
  • Inflating the plastic parison onto the cooled walls of the blow mold, where the plastic cools, solidifies, and assumes the final shape of the molded
  • Opening the mold and demolding the blow molded
  • Pinching off the squeezed off “flashes” at both ends of the blow molded part (deflashing).




The toggle mechanism is highly efficient and yields excellent results; it is widely in the clamping units of injection-molding machines. This work explores the effect of key design parameters – the speed profile of the moving platen, the stroke of the clamping hydraulic cylinder and mold-opening, the ration of force amplification, and the initial angle of mold-closing on the performance of a five-point double-toggle clamping mechanism, drawing on a newly developed formulation of motion.


  • DKB Shuttles are designed for continual use and durability: All machines are engineered with heavy-duty steel frames to accommodate high-clamp tonnage, fixed calibration and specialty trimming.
  • Hydraulic, Hybrid, and All Electric models are available with options such as In Mold Labeling (IML), In Machine Leak Testing, View Stripe and Co Extrusion, Mold and Tooling Quick Change Technology, and much more.
  • Operators’ ease-of-use considered: Simplistic operator screens and controls for easy start-up, production and diagnostics.
  • Production speeds improve output: Latest advancements in shuttle-motion technology mean multiple movements can be cammed together yielding faster cycle times.
  • DKB Die Heads speed-up color changes, improve versatility: Spiral or standard sleeves offer extremely fast color changes and exact layering structures to improve product quality.
  • Cleaner work areas with Scrap and Flash removal
  • Seamless, integrated line functions : Our fully integrated line-control system manages all machine functions as well as parison control. Designed with PLC or PC systems, you specify brands.
  • Open-architecture control systems customized to your manufacturing functions: Using off-the-shelf, commercially available parts allows for greater flexibility. All engineering functions and Super’s proprietary parison control included with these systems.


Features & Application

Drain pipe bellows outlet hose blow molding machine

Drain pipe bellows outlet hose blow molding machine, Outlet hose is a flexible connection between washtub outlet and drain pump inlet in front-load washing machine.

Plastic drain bellows

Outlet hose is a special bellows that there is outlet on both side of bellows and it is integrated.

The parameters of drain pipe bellows outlet hose blow molding machine:

Screw Diameter mm 55
Screw L/D Ratio L/D 24:1
Extrusion motor KW 15
Oil pressure motor KW 11
Screw rotate speed R.P.M 10-75
Screw heating zone Parts 4
Heating power KW 18
Parison motor  option KW
Extruding Capacity HDPE kg/h Approx.70-75
Mold Center Distance mm 60/80/90/120/130
platen distance mm 150-450
mold movement stroke mm 380
Length range of mould mm 100-320
Width range of mould mm 100-350
Thickness range of mould mm 150-180
Dry Circle time s 3.7
Mold-locked pressure Ton 7
Oil tank Volume L 200
Air Pressure kg/cm2 6-8
Air Volume m3/min 0.6
Cooling water pressure mpa 0.3-0.5
Cooling water consumption L/min 50
Min./Max. diameter of product mm 30-200
Weight of product g 20-150
Volume of product L 0.05-2
Total power consumption kw 54
Average power consumption kw Approx.21-30
Net weight of machine ton 6.5
Gross weight of Machine ton 6.7
Machine dimension (L*W*H) m3 3.8*1.9*2.5



Extrusion blow moulding is expected to show a process energy load somewhere in between injection moulding and extrusion. This is the case and typical data for an extrusion blow moulding site shows a base load of 25% of the average total energy use and a process load of 1.3259 kWh/kg. This is again generally representative of an extrusion blow moulding site that has not taken substantial energy management action.

The extrusion blow moulding site has a broadly similar base load (both in magnitude and in percentage terms) to the injection moulding and profile extrusion sites and the extrusion blow moulding site has a process load between that of extrusion and injection moulding.

Extrusion blow molding is recognizable by the hollow tube that is extruded from the machine to create the parts. This tube is referred to as a parison. A hollow mold then closes around the parison and cycles to the blow station. When at the blow station, the parison within the mold is molded through utilizing air pressure while another parison is being extruded from the machine. This allows for a quicker cycle time
Since the parison is required to hang freely during extrusion, a higher-molecular-weight polymer is required. High-density polyethylene (HDPE) is most often used within extrusion blow molding applications. Multiple heads can be used on an extrusion blow molding machine in order to create a greater output.

The two types of extrusion blow molding machines are the two-station machine and the continuous machine. A two-station, or “shuttle,” machine transfers a common mold back and forth between the extruding parison and the blow station. A continuous, or “wheel,” machine uses multiple, identical molds to continuously produce parts.

Extrusion blow molding can produce larger parts than injection blow molding. It is also less expensive, and there are no internal stresses within the part. However, more scrap is produced when using extrusion blow molding, and there is less control over the accuracy of the critical dimensions.

Application: plastic blow molded bellows