Low screened output or more seed fragments
Changing extraction intensity can change both recovery and ingredient quality. Preserve inlet, product and reject samples from the same interval so that an apparent improvement is not simply a different solids content.
| Observation | First comparisons | Equipment follow-up |
|---|---|---|
| Less accepted puree with a wetter reject | Incoming lot and temperature, feed rate, screen loading and reject collection | Inspect screen blockage, assembly and wear; assess feeding and rotor settings using the machine procedure |
| More seed fragments or coarse material | Feed preparation, product sample point and recent screen or setting changes | Inspect screen integrity, rotor-related clearances and the selected operating configuration |
| Press output alternates between wet and dry zones | Distribution across the belt, feed consistency and continuous feed availability | Check belt condition, tracking, drainage and the permitted tension/roller settings |
Layering and clarification need different checks
If a stored sample develops cream or sediment, first repeat the comparison at the same temperature, standing time and mixing condition. Natural phase separation can occur in sea buckthorn juice. The relevant question is whether the batch meets its intended product specification, not whether every sample remains visually uniform.
For a sudden change at a separator outlet, compare feed solids, temperature, flow and the discharge sequence. Look for upstream interruptions or a changed extraction setting that has increased the solids load. An unexpected oil-rich stream requires review of the intended phase duty and actual outlet arrangement; increasing speed without establishing the cause is not a general solution.
Foam, air and unstable transfer
Record tank level and pump behaviour when flow becomes unstable. Low liquid level, poor inlet conditions or air drawn into transfer can create symptoms that resemble insufficient pump capacity. Check the intended valve alignment and the suitability of the product condition before changing speed.
At a deaerator, compare feed temperature, incoming flow, vacuum condition and foam or carryover with the usual run. A change upstream in mixing or extraction may increase entrained air. Investigate the complete inlet-to-outlet path; excessive carryover into the vacuum side is not a normal way to discharge product.
Concentration drift or declining thermal performance
Check the measurement method and sampling condition before treating a concentration change as an evaporator fault. Then compare feed concentration, feed rate, product discharge, vacuum and utility conditions. Material balance helps distinguish an altered incoming product from a change in water removal.
A progressive decline during a run can be associated with deposits or changing product rheology. Review operating time, pressure and temperature trends and the last cleaning record. Thermal-system deviations must follow the defined product disposition procedure; finished packages should not be released on the assumption that a later adjustment corrected an earlier excursion.
Recurring deposits or problems after restart
Identify the actual deposit location and the cleaning circuit that reaches it. A correct reading at the CIP skid does not establish the same flow or temperature at every branch. Check return restrictions, valve positions, drainage and any dismantling step required for screens, belts or separator components.
After maintenance, compare the assembly with the correct machine configuration and check replaced screens, seals and connections. A useful service record includes the affected machine, observed symptom, product condition, relevant readings and the sequence of changes. It should keep product-quality observations separate from mechanical alarms while recording both.