About the pulverizing line

About fine grinding line

We own an “airflow mill” and process grains and leafy greens under the FSSC 22000 food safety management system.We can also provide contract processing of these products, as we are authorized to certify organic JAS certification lines.We process raw materials entrusted by our customers to meet their requirements, utilizing our knowledge and experience accumulated over many years.There are various types of fine grinders used in food processing, with different suitable raw materials and finishes.Broadly speaking, differences in milling principles and recovery methods after milling affect the finish of finely milled products and are the characteristics of each.We will introduce our fine grinding machines along with the features of each fine grinding machine.

Flow chart of fine grinding process

STEP 01

Pulverization process

Rotation of the blades generates a swirling air current that crushes the material.

STEP 02

Removal of foreign matter

Foreign objects are removed by magnets, sieve sorting, and metal detectors.

STEP 03

Particle size measurement

The average particle size of the pulverized product is measured to ensure quality.

STEP 04

Filling and packaging

Fill and pack in aluminum bags with 10kg~20kg fill weight.

Features of fine grinding mills

There are various types of pulverizers, but the difference in “pulverization principle” x “recovery method” leads to the finish and processing suitability of the pulverized product.First, the crushing principle can be divided into three main categories: impact, friction, and tearing.The “impact type” is a method in which a hammer, grinding blade, or rotor with an impact column rotates at high speed to apply a strong impact force to the material, resulting in a large amount of fine grinding in a short period of time.In the “frictional grinding” method, the raw material is sandwiched between two or more moving work surfaces, such as a bead mill or millstone, and friction is generated between the object and the work surfaces due to the movement of the work surfaces, causing the material to be ground into a fine powder.The “tear-off type” is a method in which a swirling current is generated in the grinding chamber and the materials collide with each other due to the swirling airflow, causing a pulling force that results in fine milling.

The recovery method after pulverization can also be divided into two main types: “screen type” and "air classifying type.The “screen type” is equipped with a screen (thin steel plate with punched holes) for grain size adjustment.The size that can pass through the screen = maximum grain size, and is often used in impact crushers. Since the raw material remains in the grinding chamber until it passes through the holes, it is more susceptible to thermal denaturation.On the other hand, the “air classification type” separates the crushed material into large and small particles by air flow. Only small particles are collected, and large particles are returned to the grinding chamber for regrinding.Repeated regrinding prevents clogging and results in a sharp particle size distribution.

Grinding Principle	Feature
Impact	・High crushing and processing capacity ・Susceptible to heat
Friction	・Suitable for hard fibers ・Susceptible to heat
Tearing	・Heat resistant ・Low throughput
Collection Method	Feature
Screen type	・Low cost, independent of raw material characteristics ・Fragrance does not jump easily ・Clogged up easily
Air classification type	・Less clogging and sharp particle size distribution ・Knowledge required (depends on raw material characteristics) ・Fragrance tends to fly off

Features of our fine grinding machines

Type	Structure	Grinding Principle	Collection Method	Whether or not our company owns
Airflow mill	・Rotation of the rotor and blades generates a swirling airflow, and the airflow pulverizes	Tear off	Air classifier	Possession
Hammer mill	・Crushed by high-speed rotating hammers	Impact	Screen	Possession
Pin mill	・Crushing by impact generated by rotating pin disk	Impact	Screen	Possession (Used in soybean processing lines)

Advantages of our fine grinding machines

The fine grinding mill owned by KGS is an airflow grinding mill and uses the air classification method.
※We also own a pin mill, but this page introduces the features of airflow grinding mill.

Suitable for heat-sensitive raw materials	Since the time spent inside the crusher is short (less than 1 second), the temperature rise is small, making it suitable for processing materials that are easily thermally denatured.
Contamination suppression	The structure of the crusher has no metal-to-metal collision or contact areas, resulting in less wear on the machine and less contamination.
Hygienic processing	Since the machines can be disassembled and cleaned, various products are disassembled and cleaned for each production.
Sharp particle size distribution	Automatic classification system ensures sharp particle size distribution. Particle size distribution data can be disclosed because the Nara Plant has its own particle size analyzer.
Organic crops can be produced	Due to the Organic JAS certification line, contract processing of organic agricultural products is available. Application is required for each item, so please consult with us.

Frequently Asked Questions

In which plant is the pulverization process performed?

We own fine pulverizers at “Nara Plant” and “Asahikawa Plant”. We will guide you according to the type and quantity of raw materials used.

Is contract processing of allergenic raw materials possible?

In the case of allergenic raw materials, we basically guide processing at “Asahikawa Plant”.

Is it possible to specify the particle size of the finished product for fine milled products?

We use “average particle size” as a reference value.

What is your processing order quantity?

For processing at the Nara Plant, the economic lot size is from about 1 ton due to the large size of its facilities. For orders from outside Hokkaido, please note the transportation cost.

Is it possible to cut and dry the raw material before pulverization?

Since we own coarse crushers, we will cut and pre-process before fine crushing if necessary. We do not own any vegetable drying equipment, so we will either ask our customers to handle this for us, or we will refer you to other companies.

How much prototype raw material do you need?

For mini-tests to see if it can be crushed, we can do so with as little as 100 g. We also do prototypes on actual equipment. We also use actual equipment for trial production, and we can provide information from about 10 kg for checking the average particle size, and from several dozen kg for verifying several patterns.

Are prototypes paid for?

A fee will be charged for the use of actual equipment. Please contact us for details.