Multi-Material Molding: Insert, Overmold & Two-Shot

Insert molding, hard-soft overmolding, and two-shot/two-color design: substrate preparation, CTE mismatch management, adhesion without primers, and the tooling economics that decide insert-out vs. two-shot.

Private cohorts & on-site
Format: 2-day (8:30 a.m.–4:30 p.m.)
Level: Intermediate
Location: Scheduled on demand · on-site at your facility or a regional venue
Date(s): Not yet scheduled for open enrollment. Get notified when it is, or book it privately for your team.
Includes: Certificate of Completion · printed slide binder · take-home reference text

Get notified when this course is scheduled

One email when dates are set. Or skip the wait: run it as a private cohort, on-site at your plant.

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Faculty

Faculty details for this seminar will be announced with the full schedule.

Fees

Early: $1,895 (payment 4+ weeks ahead)
Standard: $2,095 (check/ACH) · $2,165 (card)

Group discount: $200 off per attendee for 3+ from the same organization.

Also Available

  • Corporate on-site delivery at your facility
  • Private cohort sessions
  • Digital curriculum licensing

Seminar Overview

Overmolding is where polymer processing meets assembly engineering: a metal insert or a first-shot substrate becomes the core of a second material, and every failure mode in the catalog — adhesion, CTE cracking, flash, substrate damage — is waiting at the interface. This seminar covers insert molding (terminal and bushing inserts, insert packaging and automation), hard-soft overmolding (TPE/TPU over rigid substrates, medical grips, seals), and true two-shot/two-color design with the tooling economics that decide insert-out versus two-shot.

The materials half is adhesion: self-bonding TPE grades versus primers versus mechanical interlock, surface preparation, and the CTE mismatch problem that cracks overmolded metal terminals through thermal cycling. Shutoff geometry, substrate support, and the second-shot gate decisions that keep a thin wall from washing out complete the design layer.

Economics close the day: insert-out versus two-shot tooling amortization, cycle-time comparison, capital vs. labor trade, and the quality risk profile of each — taught with the connector, medical, and consumer examples that dominate the estate's demand evidence.

Ideal Learner

  • Design engineers specifying overmolded and insert-molded parts
  • Process engineers running two-shot cells
  • Tooling engineers quoting and building multi-shot molds
  • Connector, medical, and consumer-product engineers

Learning Objectives

  • Choose insert-out vs. two-shot with a defensible cost model
  • Design insert packaging, placement, and retention against wash-out
  • Specify substrate prep and self-bonding grades vs. primers honestly
  • Manage CTE mismatch in overmolded metal-terminal assemblies
  • Design shutoff geometry and second-shot gating that survives tooling

Consulting Sessions

Seminar attendees can sign up for individual consulting sessions with the instructor. Sessions are free for registered attendees, first-come first-served — sign up when registering by calling 248-539-0473 or during the seminar.

Seminar Outline

  • Insert, overmold, two-shot, two-color: definitions and boundaries
  • Material compatibility matrix: TPE/TPU/LSR over substrates
  • Self-bonding grades vs. primers vs. mechanical interlock
  • Insert types: terminals, bushings, threaded bosses, stamps
  • Insert packaging: vibratory feed, magazine, robotics
  • Retention design vs. inject pressure: the wash-out problem
  • Preheating, drying, and contamination control
  • Shore-hardness stacking and grip/ergonomics design
  • Sealing overmolds: lips, ribs, compression design
  • Thin-wall wash-out and second-shot gate strategy
  • LSR-over-thermoplastic: the bonding question answered
  • Thermal-cycling cracking in overmolded terminals: the mechanism
  • Interlock geometry vs. adhesion chemistry
  • Surface prep: plasma, primers, and their process control
  • Failure clinic: cracked overmolds, delamination, flash
  • Two-shot mold architectures: core-back, transfer, rotary
  • Cycle-time and machine-capacity economics
  • Insert-out vs. two-shot cost model workshop
  • Quality risk: which process fails which way at launch

More in Track C — Design, Molding & Tooling

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