Injection Blow Molding


The injection blow molding (IBM) process produces billions of plastic containers each year, ranging in size from 1 ml to 2 liters.  These containers meet exacting standards of consistent weight, volume and tolerance, and are popular for pharmaceuticals and toiletries to automotive and household use.



IBM Process Characteristics

  IBM Bottle Characteristics
  • No scrap
  • Exact Neck dimensions
  • No trimming
  • Thick, even walls
  • No waste
  • Parting lines nearly invisible
  • Minimal auxiliary equipment required
  • Variety of different finishes are possible


 Typical Products for Injection Blow Molding

-    Made in a wide variety of materials
-    No secondary trimming is required when making the neck finish

Ovals – Cylinders & Boston Rounds
-    Up to 24 cavity molds from 10-15 second cycles

Liquor Bottles
-    Thick walls mimic the look of glass
-    Intricate design

Pill Bottles
-    PP, HDPE, LDPE and PS
-    Can be designed with complicated injected neck finishes for Child Resistance or pilfer-proofing
-    Neck finish is excellent for barrier seals against moisture with a plug seal closure
-    Very flat for tamper foil application

Roll-on Deodorant
-    PP and HDPE
-    Close tolerance of the injection molded ball seating allows for an even application of the deodorant product

Specialty Items
-    Lab Ware
-    Custom Shapes
-    Food Coloring/Dropper Bottles


Injection Blow Molding Advantages

  • Virtually no scrap
  • Excellent gram weight control
  • Excellent material processing capability options
  • Good material distribution consistency
  • Excellent finish dimensional control
  • High cavitation capability with smaller bottle sizes - up to 32 cavity tool sets
  • Lower price for high volume, smaller size items
  • Friendly for downstream operations like decoration
  • Accommodates snap-in plugs, fitments, dispensing spouts & orifice reducers

Injection Blow Molding Disadvantages

  • Longer tooling development lead times
  • Unit cavity ahead is almost always required
  • Higher mold equipment costs
  • Injection-blown PVC has lower impact properties