02 · Dried Fruit & Nut Processing — Equipment
Cracks and removes hard shells from nuts and delivers a shell and kernel mix ready for separation. Roller, impact and dedicated designs.
Short answer: A nut shelling machine cracks the hard shell of walnuts, almonds, peanuts, cashews and similar nuts and delivers a mix of shells and kernels for separation. The nut species, its moisture, and how carefully it has been size-graded decide the mechanism and the share of whole kernels you can achieve.
Nuts are fed from a hopper at a steady rate. In a roller cracker, they pass between two rollers set to a gap slightly smaller than the nut, which cracks the shell while trying to leave the kernel intact. In an impact sheller, a rotor throws the nuts against a ring or plate; the impact breaks the shell. Dedicated machines use cutting, pressing or splitting tools shaped for one nut type.
The output is a mix of shells, kernels and some uncracked nuts. Screens and an air aspirator remove most shell pieces; uncracked nuts can be returned to the sheller or to a second unit with a tighter setting. Final cleaning of kernels is often done on picking belts or with an optical sorter.
Cashews need their own cracking mechanism and careful handling of the caustic shell liquid (CNSL). HNFODA supplies dedicated cashew shelling configurations; for a full sequence from raw nut to graded kernel, see the cashew processing line.
Moisture is the setting buyers most often overlook. Shells that are too dry shatter into small fragments that are hard to separate, while kernels that are too moist bend instead of releasing cleanly. Some plants condition nuts with steam or water, or dry them, to bring them into the right range before shelling.
| Form | Suits | Watch out for |
|---|---|---|
| Roller cracker | Peanuts, almonds, hazelnuts of uniform size | Needs size grading; settings per grade |
| Impact sheller | Hard-shelled almonds, apricot kernels | More broken kernels if moisture is wrong |
| Dedicated mechanism | Walnuts, pistachios, macadamia, pecans, cashews | Single-purpose; tooling per nut type |
Before shelling, nuts are cleaned and graded; a sieve system similar to oilseed cleaning equipment can be used. After separation, kernels go to a grain optical sorter or picking belt, then to a nut roaster, nut skin peeling machine or packing.
Roller cracker
nuts pass between adjustable rollers; suits peanuts, almonds and nuts with fairly uniform size.
Impact sheller
nuts are thrown against a surface to crack the shell; suits hard shells such as some almonds and apricot kernels.
Dedicated opening mechanism
tooling designed for one nut type, such as walnuts, pistachios or cashews, to keep more kernels whole.
Our engineers check these points with you, so the quotation fits your site rather than a catalogue default.
Grade nuts by size before shelling, bring moisture into the right range for your nut type, and set the gap or impact force for each size grade. Ungraded nuts are the most common reason for broken kernels.
The sheller produces a mix of shells and kernels. Separation is done by screens and air aspiration, sometimes followed by gravity tables or colour sorters. We can supply these as a line.
Some roller crackers can be adjusted for several nuts, but shell hardness and shape vary a lot. Walnuts, pistachios, macadamia and cashews normally need dedicated machines.
Tell us your raw material, finished product and target output. Our engineers reply with a matched configuration and quotation.
What to send with your inquiry
Email sales@hnfoda.com
How cashew and groundnut lines work: cleaning, shelling, roasting, peeling, grading, what differs between the nuts, and what to send for a quote.
Dried Fruit & Nut Processing
Investors and food companies starting or expanding dried fruit, fruit chip or dried fruit snack production.
Sized to fresh fruit input (kg/h or tonnes per day); dried output depends on moisture removed
Dried Fruit & Nut Processing
Date packers and processors adding value with washed, pitted or paste products for retail and industry.
Sized to whole date input (kg/h or tonnes per day)
Dried Fruit & Nut Processing
Food companies and brand owners launching peanut butter, almond butter or nut spread products.
Sized to roasted nut input (kg/h); output is close to input for pure nut butter
Dried Fruit & Nut Processing
Snack nut producers making salted, spiced, honey-roasted or coated nuts.
Sized to roasted nut input (kg/h) plus the seasoning added
