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Foreign Substance Separation Equipment for Food

Hitachi Zosen manufactures equipment for identifying foreign substances in food products. In the past 20 plus years, we have supplied over 1,400 machines to more than 400 clients.
We offer two major types of food sorter: imaging and mechanical.
The imaging food sorters we develop in-house, in particular, are capable of detecting objects not only by color but also by shape.

Major imaging foreign substance separation equipment

The HG Series supports precise color settings for accurate sorting, and boasts a high detection yield. Each machine can be configured to general-purpose specifications or customized to suit specific requirements.

The HG-Pro Series - Combined shape and color imaging foreign substance separation equipment

Featuring classification by both color and shape, the HG-Pro Series is capable of identifying extremely thin object elements such as fishing line.

Features

  • Precise colors settings for accurate sorting
  • High detection yield
  • B&W + 3 CCD camera
  • Object recognition by shape, color and color distribution
  • Records settings by type
  • Conveyor speeds up to 100 m/min
  • Ejector air gun pitch = 5 mm
  • Support for infrared photography
  • Separate settings for upper and lower lighting
  • Belt changes according to material

The software uses a combination of shape and color inspection, first identifying the object shape and then evaluating the color ratio to distinguish between acceptable and unacceptable articles. The system can use color ratio to identify unacceptable articles with the same color and shape as acceptable articles.

HG-mini Series - compact color imaging foreign substance separation equipment

The all-new HG-mini Series offers a compact, low-cost solution combining high-performance specifications with a user-friendly operation interface.

Features

  • High resolution from XGA3 CCD camera
  • Ultra-compact design measuring just 90 cm
  • Simple touch-screen operation
  • Learning function calibrates to new product colors
  • Detection width = 24 cm, belt speed = 90 m/min
  • Includes 5 mm pitch ejector air gun (Also available without the ejector unit)

In addition, we offer a full-circumference imaging system, which can rotate 7,500 round candies per minute for full-circumference inspection, and a double-sided imaging foreign substance separation equipment, designed to detect shape and color and remove irregularities from both sides of flat items like crackers.


Full-circumference imaging foreign substance separation equipment

Double-sided imaging foreign substance separation equipment

Major mechanical foreign substance separation equipment

Mechanical foreign substance separation equipment is designed to sort by size and specific gravity. We also offer equipment that uses electrostatic absorption for the removal of hairs.

Crank vibrator type foreign substance separation equipment (size classification + specific gravity)

Features

  • Compound machine combining vibration separator with wind separator linked to KVS vibration separator and wind separator
  • High throughput capacity with separator width of 600 mm
  • Amplitude variable in the range 1 - 5 mm (determined on the basis of sample tests)
  • Controller allows adjustment of vibration frequency
  • Wind separator includes dust collection exhaust fan that operates simultaneously with the blower. Separated into lightweight contaminants, product, and heavy contaminants in the irregular shaped hood
  • Lightweight contaminants separated from air by cyclone type contaminants extractor
  • Machine does not need to be anchored to floor
  • Vibration amplitude and angle of inclination can be adjusted to suit product characteristics
  • Hole size in separating plates can be determined on the basis of sample tests at Hitachi Zosen premises

Electromagnetic vibrator type foreign substance separation equipment (size classification + specific gravity classification)

Features

  • All parts in contact with food products are designed for easy disassembly
  • The vibration separator is a compact compound machine like the wind separator
  • The smallest compound machine with width 500 mm
  • Maximum amplitude 1.5 mm; vibration frequency and amplitude can be adjusted with controller
  • Amplitude may be affected by throughput volume; sensor-equipped amplitude controller (optional extra) maintains pre-set amplitude at all volumes
  • The wind separator features a dust collector that extracts the air when the blower operates. Irregular shaped foods are classified according to lightweight contaminants, products and heavy contaminants
  • Lightweight contaminants separated from air by cyclone type contaminants extractor
  • Machine does not need to be anchored to floor
  • Vibration amplitude and angle of inclination can be adjusted according to product characteristics
  • Hole size in separating plates can be determined on the basis of sample tests at Hitachi Zosen premises
  • Sterilizing filter for air supply fans available as an optional extra

Air vibrator type foreign substance separation equipment (size classification)

Features

  • Rectilinear vibrating sieve screener using reciprocating motion of air cylinder to produce generate very large amplitudes
  • No electric motors; suitable for use around water
  • Designed for materials that require large amplitude vibration as well as wet and/or highly viscous materials
  • Can be configured with multiple screening plates for size classification of raw materials and size sorting of products
  • Amplitude variable up to maximum of 10 mm (determined on the basis of sample tests)
  • Controller allows adjustment of vibration frequency
  • Wide type machine of width between 600 and 800 mm, suitable for high-volume throughput
  • Machine does not need to be anchored to floor; self-absorption vibrator shields the floor from effects of vibration
  • Vibration amplitude and angle of inclination can be adjusted according to product characteristics
  • Hole size in separating plates can be determined on the basis of sample tests at Hitachi Zosen premises
  • WAVS type is provided with specially-designed screening plates for separating thin materials such as hairs and line (synthetic fiber, etc.) from wet products

Introduction example of production line of foreign substance separation equipment

Hitachi Zosen boasts extensive experience and expertise in manufacturing machinery, including both stand-alone machinery and production lines. Machines are available at demonstration rooms for performing sample tests.

Crank vibrator type foreign substance separation equipment (size classification + specific gravity)

This example shows the system used in combination with a mechanical foreign substance separation equipment. The following machines are connected in series from left to right: F-1 constant feed supply, KVSJ contaminants separator, lift conveyor, HG400 MC2 and visual inspection conveyor.

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Crank vibrator type foreign substance separation equipment (size classification + specific gravity)

The system is divided into five lines to boost the visual inspection accuracy: constant feed supply, lift conveyor, crank vibrator type foreign substance separation equipment, imaging type foreign substance separation equipment and finally the visual inspection conveyor.

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Peripheral equipment

Electrostatic charge type foreign substance separation equipment

  • This system removes lightweight foreign matter via electrostatic adsorption.
  • It is designed for identifying and removing contaminants such as fragments of hair, thread and vinyl from dry foods, as well as for removing powders from the surface of processed food products.
  • Powerful direct contact adsorption and removal at voltages of up to 20 kV.
  • Adhered matter is removed using adhesive tape applied intermittently via timer regulation to ensure that all foreign matter is securely removed.

Rotary type foreign substance separation equipment

  • A rigid rotating drum fitted with stainless steel spokes at regular intervals around the circumference grades products by size in terms of width and thickness.
  • The interior of the drum is free from obstructions to enable a high degree of accuracy in size sorting.
  • Spoke intervals can be adjusted in the range 1.8-10mm.
  • The classifier moves in time with the drum rotation to minimize the incidence of blockages.
  • Equipped with blockage prevention device

Constant feed supply

  • The constant feed supply features a variable-speed slow conveyor with minimum speed of one meter per minute.
  • It is suitable for large material volumes.
  • Speed regulation prevents blocking and facilitates processing throughput settings.
  • A lifting conveyor can be set up downstream to keep down the supply feed height.
  • This system is suitable for products that are susceptible to becoming tangled or broken as well as products that do not dry readily.
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