PAIRED TRIAL / DOUBLE-STAGE PULPER
Read the product and the reject together.
Assign a lot and run ID before changing a screen or preparation step. Collect product and residue over the same stable interval, then retain a separate sample from each working-stage outlet where safely accessible.
| Record point | What travels with the sample | Comparison |
|---|---|---|
| Feed lot | Lot ID, maturity, preparation, feed temperature, collection interval | Keep the same lot while comparing one setting. |
| Screen before / after | Stage ID, screen reference / aperture, condition, damage or blocking; inspect only after safe isolation | Link a change in texture or flow to the actual fitted screen. |
| Accepted product | Sample ID, mass, seed-fragment assessment method, gritty-texture method and temperature | Hard fragments and stone-cell mouthfeel are separate observations. |
| Retained residue | Matched sample ID and mass, intact / broken seeds, skin, fibre and visible pulp carry-over | Read residue alongside the accepted product rather than recovery alone. |
View the pulper configuration →Download the blank sample record
TWO ACCEPTANCE QUESTIONS
A seed fragment is not the same finding as gritty texture.
Record discrete hard seed fragments using the agreed separation, counting or inspection method and sample mass. Record gritty texture using a separate product assessment with preparation and temperature held constant. Guava stone cells can contribute graininess even when visible seed fragments are absent.
Define pass/fail criteria with the product owner before the comparison. A screen aperture is a machine variable; it does not by itself establish a maximum finished-particle size or an accepted mouthfeel.
- Before the run: assign lot and run IDs; describe feed; identify each screen and its condition after safe isolation.
- At stable collection: mark start / stop time, feed and collected masses; label matched product and reject containers.
- At assessment: record sample mass, method, hard fragments, texture and retained pulp separately.
- At comparison: reconcile mass and screen condition before choosing the next configuration.
Open the existing optional trial worksheet → · Calculate the stream balance →
PROCESS REFERENCES
UC Davis — Guava maturity and quality
FAO — guava purée screening reference
These references support material and process context. The working sheets record your own lot and measurements.
FROM RECORD TO EQUIPMENT