Posts Tagged ‘High Density Polyethylene’

SB Rotary Blow Molding Machines

Monday, March 7th, 2011

I have talked with many customers over the last several months about our high speed “SB” Rotary Blow Molding (RBM) systems for small bottles. The applications have been expanding as the process works for any where the parison is contained in the neck. The advantages that they all say we have as compared to other shuttles, recipes and wheels are:

• No complicated takeout systems or bottle knock out devices

• No complicated tooling (shear steels, blow pins, deflashing, etc) to maintain

• High operating efficiencies of the production line

• No complicated hydraulics and greater energy savings

• Much small machine requiring less floor space

• Because of the simplistic design it requires less people

• Much high quality bottles than can be made on other type of machines

Recently I talked with a customer that said our competitor told them the SB process “does not work”, I said “does not work, what do you mean?” the competitor says that your machine produces unblown bottles, the process does not work with no tails and it takes 3 people to run the line”. So I then put him in touch with a customer that has been running our SB system, very successfully, for 4 years. After the conversation he told me “you are right, he loves his machine and says he has less than one operator”. The moral of the story is, don’t believe what you hear from competitors. With the Wilmington’s SB system, things CAN BE too good to be true. It’s simple and better than any other process on the market today, I hope you will call me to find out the truth about the SB RBM systems.

910-431-1003 or email me at:


Blow Molding Process Comparison: Shuttles (Continuous Extrusion)

Wednesday, April 7th, 2010

Shuttle Machinery – Extrusion Blow Molding

This is the most popular type of machinery for blow molding high density polyethylene (HDPE) and Polypropylene Plastic (PP) containers around the world. Literally thousands are sold every year. A shuttle machine consists of either single or dual clamps that shuttle (or slide) from under the die head to a blow pin assembly for blowing. The machines come in all sizes and configurations from single cavity to as many as 20-30 and bottle sizes from a few ounces up to a 10 litre jerry can. Included in the shuttle group is the long stroke type blow molding machine. Popular manufacturers include Bekum, SIG, Automa and Magic to name only a few of hundreds.


  • Relatively inexpensive for small to medium volume production requirements
  • Deliveries container with calibrated neck
  • Typically trims container prior to exiting machine
  • Most flexible in container size and number of cavities
  • Can handle coextrusion
  • Can handle all type of container shapes including handleware


  • Can not process PET material
  • Hydraulics and controls can be complex
  • Requires multiple machines for very high production volumes unless
  • Multiple parisons can be difficult to process consistently

Back to Blow Molding Process Comparison.