Industrial Peanut Blancher for Clean Skin Removal, Heart Separation

A split peanut blancher uses two opposing belts that grip the kernel under pressure, splitting it longitudinally into two halves while simultaneously stripping the testa skin. The output is split halves — the standard form for peanut butter and confectionery manufacturing. A whole peanut blancher uses a rubber-roll friction mechanism that removes the skin through abrasion without breaking the kernel — ideal when you need an intact whole nut for slicing, dicing, or premium snack applications where kernel appearance matters.

Yes. The split peanut blancher includes an integrated vibrating sifter that separates the germ (heart) from the split halves after the belt zone. The heart particles are smaller and lighter than the kernel halves, allowing the sifter screen — with adjustable amplitude and frequency — to achieve a separation efficiency of over 95%. Heart removal is essential for peanut butter applications because the germ contains polyunsaturated fats that accelerate oxidation and shorten shelf life.

The standard machine is designed to handle the most common commercial peanut grades — typically count sizes from 40/50 to 80/90 per pound (approximately 6–12 mm kernel width). The belt gap is adjustable via handwheel during operation, allowing operators to optimise blanching performance for different size grades. For very large-kernel varieties (e.g. jumbo Virginia types) or very small-kernel grades (e.g. Chinese small red skin), please specify your variety when requesting a quote so we can confirm compatibility or recommend a belt width configuration.

For optimal dry blanching, peanuts should be roasted to a medium roast level (typically 150–170°C depending on kernel size and roaster type) and should arrive at the blancher at kernel moisture below 3% and a temperature between 40–70°C. Under-roasted peanuts retain too much moisture, causing the skin to adhere tightly to the kernel and dramatically increasing breakage and skin-removal failure rates. Over-roasted kernels become brittle and fracture during splitting. If you are integrating blanching directly after roasting, we recommend connecting the discharge conveyor immediately to maintain kernel temperature.

Breakage above 3% is almost always caused by one of three factors: (1) kernels are too dry — below 1.5% moisture, kernels become glass-like and shatter under belt pressure; ensure roasting does not over-dry the kernel. (2) Belt gap is too tight — widen the gap using the handwheel adjustment until breakage falls to acceptable levels, then fine-tune for skin removal rate. (3) Kernel size variation is too wide in a single batch — if you are running a mixed-grade batch, smaller kernels will be over-compressed when the gap is set for larger ones. Pre-grading the kernel input significantly reduces breakage and improves blanching consistency across the batch.

Partially broken kernels (half-kernels or large fragments) can be processed through the blancher, but expect a higher proportion of meal and fine powder in the output, and lower blanching uniformity compared to whole kernels. Severely broken or powdery input is not recommended as it clogs the sifter screen and reduces heart-separation efficiency. If your raw material already contains a significant percentage of broken kernels, we recommend pre-sifting to remove fines before they enter the blancher, and informing us of the broken kernel percentage when specifying your machine so we can recommend the correct sifter screen aperture.

For a complete blanching system you typically need: upstream — a Z-type elevator or vibrating belt conveyor to feed the hopper at a controlled rate; integrated — the vibration sifter and aspiration unit are already built into our blancher machine; downstream — a discharge conveyor or bucket elevator to move clean halves to your next process, and optionally a colour sorter to remove any remaining skin fragments or discoloured kernels before packaging or grinding. We can supply all of these as a complete matched system — contact us with your layout dimensions and we will specify the full list.

Yes — the split peanut blancher is the standard upstream equipment for peanut butter manufacturing worldwide. Blanching removes the testa (which contributes bitterness via tannins) and separates the heart (which accelerates rancidity via polyunsaturated fats), producing a raw material that grinds into a stable, flavour-consistent peanut butter with significantly extended shelf life compared to skin-on or heart-on input. The machine integrates directly with standard peanut butter grinder infeed conveyor heights and is designed for the continuous-duty production cycles typical of peanut butter plants running one or two shifts per day.