Pipes, hoses

Pipes, hoses & profiles

Typical end products:
Pipes:
Solid wall pipes, corrugated pipes, PEX pipes, multilayered pipes, sheathings
Hoses: Fabric hoses, multilayered hoses, cable protection hoses, medical tubes
Profiles: Claddings, PW decor elements, window/door profiles, roll profiles, eaves, edges, seals

Typical materials: PVC, HDPE, LDPE, PP

Typical throughputs: 500-2500 kg/h 

Process description

Here, two or three components are mixed, and with the help of single or twin-screw extruders (depending on material) processed into typical pipes, hoses and profiles. In the manufacture of pipes and hoses, a center-fed die consisting of an adapter, a flow diverter and mandrel system is used. For the manufacture of profiles, other die head types are used for shape forming.

Pipes & hoses
As the extrudate exits the adapter, it spreads within a transition zone outfitted with a flow diverter to size the extrudate to its outside diameter. To form the inside diameter, the extrudate then passes over an eccentric mandrel supported by the spider legs. Once extruded, some of the pipes and hoses need only conventional water bath cooling.

However, when tolerances are strict, a sizing tank is used where the extrudate is briefly held in an OD calibration sleeve in a water-filled vacuum chamber.

Profiles
In many cases, customised profiles are formed with high-viscosity materials because they can be easily processed and cooled with air or water. The typical die head for customer-specific profiles consists of an adapter and removable plates before or after the cut-off area.

In addition, there are numerous devices for after-extrusion shape forming prior to cooling. After cooling, the products run through a haul-off station which transports the pipes, hoses or profiles to a cutting machine. Subsequently, some of the pipes are led to a socket fusion welding station. Other types of pipes and hoses are rolled up and profiles are packed for dispatch or processed.

System layout

 

1=GRAVIPLUS, 2=Option: Easyblend (volumetric unit), 3=Extruder, 4=Calibration tank, 5=Cooling unit, 6=Discharging station, 7=Cutting machine, 8=Socket fusion machine

Customer benefits

  • Flexibility in application through modular design
  • Reduction of down times at material change through intuitive handling (spring catches, etc.)
  • The high-grade (digital) load cell technology secures better recipe integrity and fewer rejects due to a very short reaction time at recipe and/or throughput changes. In addition, the process of time-consuming process sampling and system calibration is omitted
  • Acquisition of the consumption data → precise account of charges and stockkeeping possible
  • Very precise control of the overall process (start-up phase, recipe change, fast and continuous adjustment of production capacities) automatic start-up processes through integration of upstream control
  • The profound knowledge of process engineering and process-oriented overall know-how makes goldenbox the ideal partner for you