花生油 · Peanut Oil Press raw material and preparation guide
Material condition before pressing decides whether the hydraulic press can work consistently.
Preparation clarity = pods vs kernels + shell 30-40% + kernel oil 44-56% + moisture 5-8% + aflatoxin B1 <20 μg/kg + roast 160-180°C (hot) or ≤60°C (cold) + grading uniformity. Without these, the machine discussion stays shallow.
Pods versus kernels
Pods: shell 30-40%, need shelling in scope. Kernels: oil 44-56%, moisture 5-8%. The engineering path and quotation are completely different.
Kernel grade, moisture, and aflatoxin
Mixed grade and drifting moisture cause unstable pressing. Damaged kernels carry aflatoxin B1 (>20 μg/kg = rejection). Color sort or hand-pick. Test every batch.
Roasting readiness and temperature log
Hot routes need 160-180°C roasting to moisture 3-5%. Electric woks or drum roasters. Record temperature and time per batch. Cold routes skip roasting entirely.
Pods, shelled kernels, and graded-kernel starting points
The clearer the starting feed, the easier it is to land the pressing rhythm, filtration, and line boundary.
Shelling, screening, and pre-roasting discipline
This slot fits pretreatment visuals around shell, fines, moisture, and the heating window.
Feed readiness
Preparation checks to settle before pressing
Preparation clarity = pods vs kernels + shell 30-40% + kernel oil 44-56% + moisture 5-8% + aflatoxin B1 <20 μg/kg + roast 160-180°C (hot) or ≤60°C (cold) + grading uniformity. Without these, the machine discussion stays shallow.
Peanut shelling, cleaning, and feed condition
Use this clip to decide whether shelling, cleaning, and grading belong in the current phase.
Separate pods, shelled kernels, and graded kernels
Different feed starting points change prep, roasting, pressing, and filtration scope.
Pods versus kernels
Pods: shell 30-40%, need shelling in scope. Kernels: oil 44-56%, moisture 5-8%. The engineering path and quotation are completely different.
Kernel grade, moisture, and aflatoxin
Mixed grade and drifting moisture cause unstable pressing. Damaged kernels carry aflatoxin B1 (>20 μg/kg = rejection). Color sort or hand-pick. Test every batch.
Roasting readiness and temperature log
Hot routes need 160-180°C roasting to moisture 3-5%. Electric woks or drum roasters. Record temperature and time per batch. Cold routes skip roasting entirely.
Preparation flow
Where preparation affects pressing most
Clean, shell, and grade the peanut feed
Remove stones, metal, and damaged kernels. Shell pods (shell 30-40% of weight). Grade kernels by size. Reject moldy/damaged kernels (aflatoxin risk). Target moisture 5-8%.
Roast or warm to the chosen operating window
Hot route: roast 160-180°C in electric flat-bottomed woks or drum roasters until moisture 3-5% and golden color. Cold route: gentle warming ≤60°C or ambient crushing. Roast temperature must be recorded per batch.
Load the hydraulic press by a repeatable batch rule
300-325 ton (hot) or 355-500 ton (cold). Standard barrel 390×800 mm, ~100 kg. 14 partitions. Hot cycle 30-40 min. Cold cycle 60-90 min. Residual oil target: hot 6-8%, cold 8-10%.
- Feed: pods or shelled kernels? Shelling included or upstream? Kernel oil content and moisture tested?
- Aflatoxin: control method (color sorter, hand-picking, lab test)? Target B1 <20 μg/kg (EU) / <20 ppb (US)?
- Route: hot press (roast 160-180°C, press 80-100°C) or cold press (≤60°C) or dual route?
- Roast equipment: electric flat-bottomed woks, drum roaster, or integrated roasting module? Capacity?
- Cake value: feed ingredient, peanut flour (60-80 mesh), or waste? Does it influence pressing strategy?
Common misses
Problems the press should not be asked to hide
- Do not describe feed simply as 'peanuts' when the real issue is pods (shell 30-40%) vs kernels (oil 44-56%).
- Do not expect the press to compensate for poor shelling, mixed kernels, moisture >10%, or aflatoxin contamination.
- Do not market cold-press premium if kernel handling and storage are closer to a bulk-oil workshop.
- Do not leave cake handling out of early discussion. Cake protein 45-50% is a major revenue stream if managed.
Questions to confirm next
Do peanuts need shelling before hydraulic pressing?
Is peanut oil usually hot pressed or cold pressed?
Read this next
These next pages move the peanut discussion forward
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Share peanut feed form, shelling status, target output, roasting method, filtration requirement, and cake destination so the scope can be narrowed to the right machine class and project boundary faster.