VYRCOWhat you will learn
- Keep the exact grade and batch through every transfer and authorized blend.
- Distinguish requirement, setpoint, observed reading and measured material result.
- An interruption or missing value needs context and review, not an automatic explanation.
Who it is for: Materials, process and quality personnel in injection molding.
Map the batch’s actual journey
Write down the points the material passed through: receiving, storage, opening, preparation, hopper and production order. At each transition identify origin, destination, quantity if known and time. The aim is to determine where a particular sample’s raw material came from without relying on a shift’s memory.
If a container is split between destinations, retain both links to the original batch. For blending under an authorized procedure, record participating batches and quantities. Do not replace those identities with a generic description such as “available material”. Flag any section of the journey whose origin cannot be reconstructed.
Use the exact grade’s document
A polymer family does not identify the entire formulation. Record manufacturer, grade and applicable data-sheet revision. The linked BASF sheet illustrates that conditions are published for specific products; its numbers must not be transferred to another grade. Also identify the internal procedure using that information and who resolves discrepancies.
When material, supplier or document changes, retain the effective date and affected orders. If a printed copy differs from the current document, record the conflict before treating it as a reference for interpreting a result.
Keep four kinds of information distinct
The worksheet should separate the source requirement, equipment setting, observed reading and sample measurement. Drying context includes temperature, time, air and dew point; dew point describes the air and does not replace a material moisture measurement. Use the applicable method for any conclusion.
Always retain unit, time, location or sample and instrument when relevant. If data do not exist, state “unavailable”. A blank cannot explain whether nobody measured, an instrument was unavailable or a record was lost. The person reviewing the batch needs that distinction to select a useful follow-up.
| Type | What to preserve |
|---|---|
| Requirement | Data sheet, revision, value and unit |
| Setpoint | Equipment, recorded setting and time |
| Reading | Observed value, location and time |
| Sample | ID, method and available result |
Record interruptions and later exposure
If feeding stopped, material moved to another container or production was delayed, record the start, known end and affected quantity. Do not assign an automatic consequence; give those facts to the owner for assessment using the specific documents.
Keep decisions and their scope. A decision about one hopper must not extend without explanation to every batch in stores. If a sample is retained, link its identity to the order and collection time. That allows comparison with later parts without confusing periods or treating two unrelated samples as a pair.
Connect the record to production and quality
Link material, mold, cavity if known, shift and order. The shot-material calculator estimates nominal mass; it does not validate drying or reconcile an actual material balance. Similarly, a reject percentage describes recorded pieces but does not establish a defect’s cause.
When a problem appears, use the defect-evidence record and compare batches through their original data. Identify what changed and what remained the same. If an important measurement is absent, the next useful action may be improving data collection rather than changing machine settings on an assumption.
Fictional example: an interruption with a defined scope
Batch MAT-DEMO is divided between T1 and T2. T1 feeds order OP-A; T2 feeds OP-B. A 12-minute interruption is recorded only at T1. The report retains both destinations and flags assessment of OP-A as pending. It neither attributes the same event to OP-B nor claims that elapsed time establishes adequate moisture. Samples S1 and S2 remain connected to their respective orders.
Mistakes to avoid
- Recording only the polymer family and losing the grade or batch.
- Entering a setpoint in a field intended for an observed reading.
- Treating dew point as the resin’s moisture result.
- Attributing a defect to drying without evidence for the affected batch.
Checklist before continuing
- Every transfer retains origin, destination and identity.
- Data sheet and procedure have identified revisions.
- Requirements, settings, readings and samples remain separate.
- Interruptions and missing data have scope and ownership.
- The production order leads back to the material history.
Sources and review
- Conair · Drying fundamentals in the dryer manual
Context for drying variables; use instructions for the specific material grade and equipment.
Accessed: 2026-10-10 - BASF · Ultramid B3K6 Processing Data Sheet
Example of a grade-specific data sheet. Its values are not recommendations for other materials.
Accessed: 2026-10-10
Original general guidance by VYRCO based on the listed references. Examples are fictional. Editorial review does not validate your process. To correct an item, identify the article, date and source at info@vyrco.com.