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Blow Tooling

tooling for blow moldsWhen you get a new mold set chances are you are going to need new auxiliary tooling to go along with it. Monroe Mold can design and build blow pin and take-out tooling that will fit your blow mold machine to efficiently run with your new mold set. If any secondary operations like deflashing or facing and reaming are required, we can design and build the appropriate tooling for your existing machine to create effective blow mold design.

Make Monroe Mold your first call when you need blow mold replacement parts for your machines. Our toolmakers are highly skilled at repairing and replacing damaged tools. By maintaining a large inventory of parts in the industry and leveraging our best-in-class manufacturing processes, Monroe Mold will will deliver on-time to minimize any downtime.

In extrusion blow molding a hollow tube, or parison, is formed by forcing material between a die and a mandrel. A mold cavity, composed of two halves, closes around the parison, sealing the bottom. Blow pins are inserted into the top of the tube, forming the neck. Compressed air expands the parison to conform against the cold mold cavity walls. When sufficiently cool, the mold opens and the container is removed and trimmed of excess plastic or flash. Flash, a basic characteristic of extrusion blow molding, is formed when the parison is pinched off by the mold. Since plastic resins can be reprocessed, the flash is not wasted but is used as regrind mixed back with virgin material. Wall distribution, thickness and weight can be controlled by parison programming. While the parison is extruded, programming changes in the relation of mandrel and die can be used to shift material from heavier, stronger areas to lighter, weaker areas. This method aids significantly in maximizing container performance and minimizing container weight and cost.


Advantages of Extrusion Blow Molding:


  • Low initial mold tooling costs
  • Flexibility of tooling: Molds can accommodate interchangeable neck finishes and body sections
  • Flexibility in production: Neck inner diameters can be easily controlled to varying requirements. Bottle weights are adjustable
  • Container sizes can range from less than 1 oz. to 55 gallons and up.
  • Bottles can be long and flat or have handles
  • Wide selection of machine sizes: Molds can be geared to volume requirements


Custom Tooling:


Custom variations to stock bottle tooling include:

  • Embossing stock containers through the use of a sleeve
  • Neck rings to provide versatility of closure use, including specialty closure applications
  • Inserts to produce a custom capacity or height by inserting a slug into a stock mold with a stack design

Monroe Mold has the know-how and experience to provide the type of custom tooling required to fit your packaging needs. Call on us for a consultation on any potential package.