*** Please note, each row and course# listed below is a separate, complete course. ***

Rubber Injection Molding

Course# Date Time Location

Coming Soon

Cost: $2,000.00 USD
Online Registration
CEU's: 3.25
Instructor: Terry Chapin and Van Walworth

Course Overview

Days 1, 2, 3 and 4: 9:30 am – 12:30 pm and 2:00 pm – 5:00 pm

This seminar presents the principles of injection molding including basic mold designs as well as more complex injection mold designs.  Rubber rules will be discussed as well as designs of runner layouts, runner cross sections, and runner balancing technique. Hot runner designs along with sprues, gates, tear trims, overflows and venting techniques are discussed along with vacuum techniques.  The benefits of pulse filling with injection molding will be discussed plus how cantilever can be both good or bad for rubber molding. Included are how to troubleshoot the Injection rubber molding processes.  

Solid and split cold runner blocks are discussed.  Cold nozzle drops and valve gate techniques are presented.

Online Course Requirements

We want you to have a great experience participating in our remote (online) courses, and for that, you’ll need the right equipment and internet connection.

Minimum needs are:

  • A broadband internet connection that has at least a 2 Mbps upload and download speed.
  • A computer (PC or Mac) that can support the latest web browser versions.
  • At least 4 GB of RAM and adequate hard drive space.
  • A microphone and a speaker.
  • International Students: For virtual (online) courses, an additional fee will be assessed to cover the cost of shipping the professional binder (presentation slides), to your address. The cost of international shipping can be significant.

For more information, visit our Online Course Requirements webpage.

Instructor Biographies:

Terry Chapin

Terry Chapin received his B.S. from Youngstown State University in Youngstown, Ohio in June 1980. He majored in mechanical engineering and minored in math and civil engineering.

After 33 years, he retired from Delphi as a senior materials engineer, working primarily in the area of silicones, elastomer parts and foam products development. He was previously senior rubber technical and cost leader at Delphi, after working as a tool engineer for rubber and plastic molds at the Delphi Packard Division for more than 20 years.  He is now working for himself as a consultant and instructor.  His new company is Elastomeister, and his position is Rubber Technologist.

Van Walworth 

Van has a BS degree from the University of Alabama in mechanical engineering drafting and design and has become a well-known “hands on practitioner”.  Most of his primary application skills are focused on products manufactured from materials related to the rubber, plastic, & pipe industries.  In many circles he is known as “The Ideaguy” or as “The Rubber Whisperer”.

Van is an internationally recognized technical educator for in-plant seminars, and university level continuing professional education programs.  He is a published author of many technical papers as well of the author of the book “Rubber Molding Principles” first published in 2013 and the creator of a series of Troubleshooting Charts for processing rubber, all published and distributed by TechnoBiz.

His professional career spans over four decades holding executive management positions with industry leading companies practicing product R&D, mold design, tooling & equipment design, process establishment & improvement, reverse engineering, troubleshooting, project management, and spontaneous creativity.

  • Understanding principles of rubber flow behavior and fill of injection runners and cavities
    • Rubber Rules
  • Injection Mold design techniques and best practices
    • Basic Information
  • Best practices for injection runner layout design
  • Runner cross section design techniques
  • Balanced cavity filling techniques
  • Best practices for sprue and gate designs
  • Understanding the relationship between flash management and registration/alignment
  • Understanding the relationship between flash management and clamping pressure
  • Best practices for tear-trim designs for flash removal
  • Cavity inserts design techniques
    • Floating cavity design techniques
    • Split Cavities
  • Understanding pulse filling techniques
  • Cantilever in Rubber Presses
  • Alternative Parting Lines
  • Mold cleaning practices and options
  • Tolerances for Rubber Parts
  • Appendix Troubleshooting the Injection rubber molding processes
    • General Troubleshooting Techniques
    • Air Traps
    • Blisters
    • Backrind
    • Knit Lines/Splits/Non-Fills
    • Rubber Bonding
    • Cryogenic Deflashing


If you have any questions or need more information about this course, please contact:

Penelope Pinkston


Online Registration


Registration Form

Registration information: Registration shall remain open until posted as closed on the course listing on this site.

Registrations must be guaranteed by check, a purchase order number or a credit card, otherwise the registration will not be processed. Checks should be made payable to "The Akron Polymer Technology Services Training Center" and must include a copy of your completed registration form. Course fees are due before attending.

All registrations—whether by online, phone, fax or mail—will be confirmed and considered binding and subject to all cancellation policies. If you do not receive a confirmation prior to the class, please call The Akron Polymer Technology Services Training Center to verify your registration.

Course fee includes classroom instruction, instructional materials, parking permits, continental breakfast, lunch, beverages and refreshment breaks. Travel and hotel accommodations are not included.


Visit our registration webpage to view our cancellation/withdrawal policy.