01
Define the part and resin
Drawing, projected area, part and runner weight, wall sections, tolerance, cosmetic zones, resin grade and additives.
A documented molding job—not only a product name.G1
DISCOVERY / MACHINE SELECTION
How to select an injection molding machine: start with five linked decisions.
A defensible shortlist connects the molded part, resin, mold envelope, injection demand, architecture, cell integration and acceptance plan. Work through the sequence before comparing model names or prices.
SELECTION SEQUENCE
Each decision creates the input for the next.
Keep source data, estimates and supplier assumptions visible. If an input changes, revisit the downstream machine and cell choices.
02
Check the mold envelope
External dimensions, weight, thickness, tie-bar clearance, opening, daylight, ejection, cores and loading route.
A clamping-unit fit check and platen-layout review.03
Check the injection unit
Total shot basis, pressure demand, plasticizing requirement, screw/resin compatibility and residence-time considerations.
A reviewable injection-unit shortlist with assumptions shown.04
Choose architecture and motion
Cycle sequence, repeatability need, mold access, utilities, maintenance model, insert handling and simultaneous motions.
An architecture choice tied to the job rather than a generic preference.05
Define cell and acceptance
Robot, auxiliaries, interfaces, layout, utilities, destination documentation, trial mold/material and quality/output checks.
One commercial scope covering machine, integration, exclusions and test conditions.ARCHITECTURE SCREEN
Ask what changes the process—not which label sounds advanced.
These are decision routes, not confirmed model availability. The final shortlist depends on controlled supplier data and the project brief.
All-electric
Do motion control, simultaneous movement, clean operation and utility profile justify this path?
Servo-hydraulic
Does the job need a versatile process window and a hydraulic operating/maintenance model?
Two-platen
Do mold size, weight, access, daylight or plant footprint make clamp architecture decisive?
Vertical / insert
Do insert loading, table movement, access and guarding define the production sequence?
High-speed cell
Is the cycle target supported by plasticizing, cooling, ejection, takeout and downstream handling?
Review the high-speed project pathMulti-component
How do material sequence, injection positions, mold movement and control interlocks work together?
SHORTLIST / QUOTE REVIEW
Compare like with like before comparing price.
A lower number can hide a different machine configuration, missing cell scope, different delivery basis or undefined acceptance test.
Comparable scope
Do all quotes include the same machine, options, auxiliaries, robot interfaces, documents and service boundary?
Comparable data
Are shot, platen, opening, utilities and dimensions stated on the same basis and revision?
Visible assumptions
Are estimated part, mold or process inputs clearly marked and assigned to an owner?
Test conditions
Are trial mold, resin, cavities, cycle measurement and quality acceptance defined?
Exclusions
Are installation, commissioning, freight, local compliance work and consumables explicitly included or excluded?
BUYER QUESTIONS
Machine selection FAQ
Use these answers to keep early procurement conversations connected to the engineering inputs that must still be confirmed.
01Is clamping tonnage enough to select an injection molding machine?+
No. Clamp force is one result of the part, projected area, mold and process review. The machine must also fit the mold physically, provide a suitable injection unit, support the required motion sequence and integrate with the plant and auxiliaries.
02Which is better: all-electric or servo-hydraulic?+
Neither architecture is universally better. Compare the actual motion profile, precision and cleanliness needs, resin and mold demands, utilities, maintenance capability, investment basis and lifecycle scope for the project.
03Can selection start before the production mold is finished?+
Yes, but preliminary and confirmed inputs must stay separate. Use the latest mold layout, estimated shot and process assumptions for a provisional shortlist, then repeat the fit check when controlled mold drawings and trial conditions are available.
04How should two machine quotations be compared?+
Normalize the model configuration, injection-unit basis, clamp and platen data, options, robot and auxiliary interfaces, utilities, documentation, delivery basis, service scope and acceptance conditions before comparing price.
05What makes an RFQ ready for technical review?+
At minimum, identify the part, resin, total shot basis, mold dimensions and motion, cavity/runner design, target output, plant utilities, automation scope, destination and any mandatory test or documentation requirement.
SELECTION GUIDE / APPLY IT
Build one brief that engineering and procurement can compare.
Record the part, mold, resin, output, utilities, integration and destination requirements before asking for a model and commercial scope.
Build the machine brief