Our Multilayer Blow Molders Can Produce Any Blow-Moldable Part,
with Improved Cost, Stiffness, Appearance or Barrier Properties

Industrial Blow Molding Machine

Wilmington Machinery designs and builds industrial blow molding machines to specifications provided by customer for niche or proprietary applications, for production of medium to large bottles and all blow molded commercial products at rates of 60 to 300 parts per hour. Single or dual parison 1 to 6 layers, 5 to 150 pounds, 15 to 300 tons.

Experience base includes accumulator heads with single screw extrusion, reciprocating screw extrusion/pushout, tiebarless clamps, multi-clamp in-time (click to see video), and foam core blow molding.

Wilmington Machinery has applied our 40 years of experience in multilayer packaging blow molding and 30 years’ experience in industrial blow molding to produce a series of simple and capable large part multilayer blow molding machines. Then machines are simple in that they utilize multiple reciprocating screw plasticizers for melting and accumulation. The melted material is then delivered – first-in, first-out – to a simple and reliable side feed head. Precise ratio control of the delivery of the various layers makes the machines capable of equally precise layer formations for the most demanding applications.


  • Closed loop reciprocating screw units with L/D ratios 24:1 & 30:1 with direct hydraulic drives, bimetallic barrels and ceramic heaters
  • Outputs from 50 – 1500 lb./hr (20 – 750 kg/hr) or combined output to 4500 lb./hr (1500 kg/hr)
  • Parison drop weights from 2-75 lb. (1-34 kg)
  • Individual layer thickness control
  • Profiled parison thickness control
  • Tooling from 2” - 24” (50 – 600 mm)
  • Tiebarless clamp (option)
  • Programmable machine control for all functions with recipe storage
  • Direct force hydraulics for all drive, ram, pushout and clamping functions

4-7 Layer Applications

  • 1975 – Rotary Series
  • Virgin inner layer
  • Regrind layer (optional)
  • Adhesive / tie layer
  • Barrier layer
  • Pigment / UV outer layer
  • Gloss or high temperature outer layer