Name the metric
Ask whether the catalogue field is screw linear speed, injection volume flow, mass flow or an observed fill result.
G13
INJECTION / DATA NORMALIZATION
Injection speed and injection rate are not interchangeable catalogue fields.
Separate screw linear speed from injection volume flow, mass flow and actual fill time. Compare the exact screw configuration and preserve the test or calculation basis before using any value in a machine shortlist.
ANSWER FIRST
Normalize the definition before comparing the number.
The same screw travel speed produces a different theoretical volume flow when screw diameter changes. Even a normalized flow value does not prove how a configured machine will fill the intended mold.
Keep fill demand separate from plasticizing recoveryCatalogue comparison gate
- Exact metric name and original unit
- Injection unit and screw diameter
- Maximum, calculated or measured status
- Profile, pressure limit and test condition
- Configured mold/material confirmation plan
FIELD DEFINITIONS
Five fields answer five different injection-stage questions.
Keep dimensions, conditions and evidence state attached to every value. An unlabeled maximum is not a project result.
| Field | Typical dimension | What it tells you | What it does not tell you |
|---|---|---|---|
| Screw injection speed | Linear travel per time, commonly mm/s | How fast the screw moves forward during injection | Screw diameter, volume displaced, acceleration and actual profile |
| Injection volume flow / rate | Volume per time, commonly cm³/s | Theoretical or stated volumetric delivery basis | Actual melt behavior, pressure limit, machine response and mold restriction |
| Mass flow | Mass per time | Material delivery when a defined density and measurement basis are used | Whether density is solid, melt, calculated or measured |
| Fill time | Time from agreed injection start to agreed fill endpoint | A project result for one mold, material, profile and process state | Transfer definition, cushion, pressure limit, cavity balance and quality result |
| Injection profile | Position/time segments plus limits | How speed or flow changes through the screw stroke | Controller response, configured unit and validated process window |
RFQ WORKSHEET
Build one traceable row for every quoted injection value.
The worksheet is a comparison aid. Engineering review and a representative molding trial control the final configuration.
| Worksheet field | Entry rule |
|---|---|
| Metric name | Use the supplier's exact label; do not silently translate speed into rate. |
| Value and unit | Preserve the original unit and identify whether it is maximum, settable or measured. |
| Screw configuration | Record screw diameter, injection-unit designation and any option that changes the value. |
| Conversion basis | If converting, show the screw cross-sectional area, unit conversion and source revision. |
| Profile basis | Record acceleration, profile segments, pressure limit and transfer method where available. |
| Project evidence | Add intended resin, shot volume, mold, gate, target fill time and simulation/trial status. |
| Acceptance method | Define which configured-machine and mold trial will confirm the relevant result. |
REVIEW SEQUENCE
Move from catalogue field to project evidence without skipping a boundary.
Treat conversions as transparent calculations, not as new supplier claims.
Lock the screw
A volume-flow conversion depends on screw cross-sectional area, so compare the exact offered screw configuration.
Keep the source value
Store the original value and unit beside any converted value so the calculation remains auditable.
Add dynamic conditions
Maximum values do not describe acceleration, profile tracking, pressure limitation or simultaneous machine motions.
Test the molding job
Use the intended resin, mold, gate, shot and quality criteria to confirm whether the configured system meets the fill requirement.
PRIMARY SOURCES / BOUNDARY
Use official technical material for definitions—not for supplier claims.
These sources were reviewed for field meaning and comparison structure. They do not verify any NEW ORIENTAL IMM model, value or application result.
A Question of Class — How Feed Rate, Injection Volume and Filling Time Correlate with Injection Unit Performance
Supports the dimensional distinction between screw feed speed and injection volume flow, including the dependence on screw diameter.
Boundary: The relationship is a normalization aid, not proof of actual fill performance or this site's machine capability.
EUROMAP 4 — Determination of Actual Injection Efficiency
Provides the official recommendation document identified by EUROMAP for actual injection efficiency.
Boundary: The guide uses the document identity only and does not claim that any supplier value was tested under it.
Technical Recommendations library
Provides the official recommendation index and terminology context, including EUROMAP 4 for actual injection efficiency.
Boundary: A listed recommendation does not establish compliance, installed capability or a universally comparable catalogue value.
BUYER QUESTIONS
Injection speed and rate FAQ
These answers keep catalogue metrics, calculations and project results in separate evidence states.
01Are injection speed and injection rate the same?+
No. Screw injection speed is linear screw travel per time. Injection volume flow or rate is volume per time and depends on screw cross-sectional area. Keep the original field names, units and screw configuration visible.
02Can injection volume flow be calculated from screw speed?+
A theoretical screening conversion is Q = (π × D² / 4) × v, where D is screw diameter and v is linear screw speed in consistent length units. It does not account for compressibility, leakage, acceleration, pressure limiting, controller response or mold restriction, so a configured trial remains necessary.
03Does the highest catalogue injection rate mean the shortest fill time?+
Not automatically. Actual fill time depends on the configured injection unit, acceleration and profile, pressure availability, resin viscosity, shot, gate and cavity restriction, transfer method and part-quality limits.
04How should two supplier data sheets be compared?+
Normalize the metric definition, unit, screw diameter, injection-unit configuration, maximum-versus-measured status and test conditions first. Flag any field that cannot be aligned instead of filling the gap with an assumption.
05What belongs in the injection-stage RFQ worksheet?+
Include the original speed/rate fields, screw configuration, intended resin and condition, shot volume, target fill profile or fill time, pressure requirement, mold and gate data, evidence status and the acceptance trial.
INJECTION DATA / NEXT STEP
Send the original values and the conversion basis.
Add the screw configuration, resin, shot, mold restriction, target profile and acceptance method so application engineering can review the actual injection-stage requirement.
Build the machine brief