Application guide / fruit purée and pulp
Fruit purée and pulp can vary with cultivar, maturity, screen size, formulation, temperature and storage history. A useful tube-in-tube review describes that variation and the quality target instead of treating every purée as the same homogeneous liquid.
Continuous phase
Record density and rheology across the expected process-temperature and shear window. Note added sugar, starch, pectin or other formulation changes, plus any settling or phase-separation tendency before and after heating.
Dispersed phase
Fibres, seeds, pulp and pieces affect passage clearance, pump choice, heat transfer and residence behaviour. Give the distribution and maximum dimensions on three axes, concentration, hardness and the acceptable post-process integrity.
Fit questions
Confirm upstream mixing, deaeration, level control and pump conditions so the sterilizer receives the defined formulation and flow.
Compare particle and fibre dimensions with every restriction: pump, valves, tube transitions, instruments and downstream filler.
Non-Newtonian flow and particulate motion can make average residence time an incomplete safety basis. The validation plan must address the actual product.
Set measurable acceptance for colour, flavour, aroma, separation, texture and particle integrity after pumping, heating, holding and cooling.
Define fouling indicators, pressure or temperature trends, the required campaign duration and a validated cleaning endpoint.
Match outlet temperature, pressure, particle clearance, buffer strategy, sterilization sequence and control handshake.
Sample and acceptance plan
| Record | Why it matters | Example acceptance evidence |
|---|---|---|
| Formulation and batch state | Confirms the tested product represents production | Recipe class, cultivar, maturity, screen and storage history |
| Operating conditions | Links outcome to flow, temperature, pressure and run time | Timestamped instrument trend and sample points |
| Particle and fibre outcome | Tests passage and pump effects | Before/after distribution and agreed integrity check |
| Quality outcome | Balances thermal duty with product value | Defined colour, flavour, texture or separation method |
| Cleaning outcome | Tests recoverability after a representative run | Agreed visual, chemical or hygienic verification method |
Research basis
These studies illustrate product-specific thermal and particle behaviour. They are not universal limits and do not establish a scheduled process for a Site34 project.
Fruit-process review
Use the RFQ brief to separate measured values, expected variation, acceptance criteria and the tests still needed.
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