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Of Single Cavity Injection
Mold For The Material
Handling Industry
Custom Manufacturing
Of A Plastic Jug Single
Cavity Blow Mold For The
Liquid Industry
Major Supplier to the
Pipe Fitting Industry
CNC Machined 5 Material
Savers for the Rubber
American Mold Building AssociationNational Tooling and Machining Association

Custom Manufactured Polypropylene Lid from a Single Cavity Injection Mold, used in the Material Handling Industry

Custom Manufactured Polypropylene Lid from a Single Cavity Blow Mold, used in the Material Handling Industry

Colonial Machine custom manufactured a series of single cavity injection molds for a client from the material handling industry. The 3D model of this finished product is displayed at left. Used to produce a polypropylene lid, the molds measured 41" x 30" x 15". The units also featured a hi-hard P-20 steel cavity and core, an ejector box, and an Incoe hot runner system.

Meeting tolerances as close as .002", we combined our CNC machining, sinker EDM, and grinding operations to manufacture this part. This process included rough machining and finishing the cavity and core block, finishing the waterlines, and drilling all ejector pin holes. In addition, we blended all tool marks and used our advanced Charmilles sinker EDM technology to machine 14 different locations on this part. The core was provided a glass bead finish, while the cavity was given a textured finish.

Fulfilling consumer specifications, Colonial Machine has manufactured a great number of this type of mold.  Fulfilling  our customer’s specifications, we finished the order of 4 molds and shipped to their facility in California within a 6 to 8 week turnaround time. All molds met with absolute customer satisfaction.

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Custom Manufacturing Specifications for the Polypropylene Lid

Product Description   This custom manufactured mold is used within an Injection Molding application to produce a polypropylene lid.

Capabilities Applied/Processes  
CNC Machining
  • Rough Machine Cavity & Core Block
  • Finish Waterlines
  • Drill Ejector Pin Holes
  • Finish Machine Cavity & Core Block
Sinker EDM
  • Machine 14 Locations
  • Blend Tool Marks

Equipment Used to Manufacture Part  
Various Horizontal and Vertical CNC Milling Machines
Charmilles Sinker EDM
Technidrill - High Speed Gundrilling
Spotting Press

Overall Part Dimensions  
Mold size:
Length: 41.00"
Width: 30.00"
Thickness: 15.00"

Tightest Tolerances   .002"

Material Used   Cavity & Core: Hi-Hard P-20 Steel
Ejector Box P-20, regular
Incoe Hot-Runner System

Material Finish   Glass Bead Finish core, Texture finish cavity

In process testing/inspection performed   ISO 9001 calibrated tools and equipment

Estimated Part Weight   4200 lbs

Industry for Use   Material Handling
  • For Industrial or Consumer Storage Needs

Quantity Manufactured   100's

Turn Around Time   6 to 8 Weeks

Delivery Location   Los Angeles, CA

Standards Met   Customer supplied 3-D Geometry

Product Name   Injection Molded Lid Mold

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