The main activity of the company KRONUS MN Ltd. is the manufacture of five different chest freezers models, which differ from each other by their volume in liters.

Standard chest-freezers:
Gross volume in liters: 140L, 200L, 300L, 400L and 500L.
Key specifications of the products are:
- insulation thickness: 55mm
- refrigerant: gas R134a
- temperature range: -15°C to - 25°C
- energy consumption  C class
The whole production is located in the area of 5,200 m2. Annual production output in one shift is 30,000 units. At the moment the factory staff numbers 38 full time employees, plus 22 part time workers. The production is run in the condition of optimal working power and profitable usage of resources. From the very beginning of the production there were produced and sold 60,800 units, 90% of which on the foreign markets.

PRODUCTS AND THEIR FEATURES

Models and key features for the standard chest-freezers which are the main part of our production range:

1. Chest-freezer SCO-15
Gross volume: 140 lit.
Net volume: 130 lit.
Power: 88 W
Gross weight: 37 kg
Net weight: 33 kg
Product dimensions:
- W - 550 mm
- L - 598 mm
- H - 850 mm
Packing carton size:   
- W - 600 mm
- L - 670 mm
- H - 960 mm

2. Chest-freezer SCO-20
Gross volume: 205 lit.
Net volume: 195 lit.
Power: 120 W
Gross weight: 49 kg
Net weight: 41 kg
Product dimensions:            
- W - 680 mm
- L - 763 mm
- H - 870 mm
Packing carton size:   
- W - 700 mm
- L - 800 mm
- H - 950 mm

3. Chest-freezer SCO-30
Gross volume: 310 lit.
Net volume: 298 lit.
Power: 170 W
Gross weight: 60 kg
Net weight: 51 kg
One food basket
Product dimensions:            
- W - 680 mm 
- L - 1043 mm
- H - 870 mm
Packing carton size:   
- W - 700 mm
- L - 1100 mm
- H - 950 mm

4. Chest-freezer SCO-40
Gross volume: 410 lit.
Net volume: 396 lit.
Power: 220 W
Gross weight: 60 kg
Net weight: 51 kg
Two food baskets
Product dimensions:            
- W - 680 mm
- L - 1323 mm
- H - 870 mm
Packing carton size:   
- W - 700 mm
- L - 1400 mm
- H - 950 mm

5. Chest-freezer SCO-50
Gross volume: 505 lit.
Net volume: 490 lit.
Power: 270 W
Gross weight: 83 kg
Net weight: 72 kg
Three food baskets
Product dimensions:            
- W - 680 mm 
- L - 1603 mm
- H - 870 mm
Packing carton size:   
- W - 700 mm 
- L - 1650 mm
- H - 950 mm

Key features of the product:
Temperature range: from -15°C to - 25°C
Refrigerant: gas R134a
Insulation thickness: 55 mm
Power supply: 220/240 V 50Hz
Inner light
Lock & key / pocket handle
Energy consumption: class C

RATING LABEL

Model: SCO 30
Class: N
Refrigerant: R134a
Power supply: 220-240V/50Hz
Rated-current: 1.2A
Power: 170W
Gross volume: 310 dm3
Net volume: 298 dm3
Freezing capacity: 19kg/24h
Energy class: C
Energy consumption: 506kW/year
Noise: 49 dB(A) re 1pW

QUALITY

Quality of the product is our  constant care because our customers deserve top products! EC/CE Declaration On Conformity is the result of such an effort. In production process standardization, there were significant collaboration with SIQ – Ljubljana (Slovenia) and the Quality Centre at the University of Montenegro.

PARTNERS

To achieve an aim for high product quality and maintain it, all the key components are imported from the world top manufacturers:
Electrolux ACC (compressors)
Lampre, Plalam (sheets)
Huntsman, Dow (polyurethane)

PRODUCTION PROCESS
    
Technological process in manufacturing chest freezers consists of the following units:

i) Sheet-metal line:
It is the first stage in the production process and consists of: chopping, cutting through, plastic coated and galvanized sheet-metal forming. The aluminum tin plates are used for the inner liner of the cabinet; the plastic coated for the sideboard and top; galvanized for various edge strengthening on the product (door hinge, legs…).
For the mentioned work in this section, the following equipment was installed:
- Automatic press for sheet-metal cutting “WIDERMAN”
- Hydraulic press for lengthwise sheet-metal bending - 2 units
- Mechanic press for lengthwise sheet-metal bending - 2 units
- Mechanic scissors for sheet-metal – 2 units
- Pneumatic press for sheet-metal bending.

ii) Evaporator and cabinet forming line:
It consists of unwinding from coils and cutting on a proper size the aluminum and copper tube, their bending into spiral closed system to fit the cabinet form. The evaporator heat-exchanger shaped in this way is fixed to PVC self-adhesive foil to the exterior cabinet wall.
On this line the following equipment was installed:
- Pneumatic press for return pipe bending;
- Pneumatic press for forming the Cu tubes;
- Mechanic press for Al pipes unbending;
- Mechanic press for evaporator Al pipes bending.

iii) Polystyrene panels vacuuming line:
This is a separate unit in the production process and consists of vacuuming, deep forming   
/under high temperature/ of the cabinet frame, the inner door and top cover from polystyrene tables.
In this line was installed:
- Vacuuming and thermoforming machine for PS tables TERMOFORMING with 4 stations;
- Pneumatic die cutting machine for inner door;
- Cabinet PS frame polling machine PANTOGRAF.

iv) Injection line:
It is also a special unit in the production process and cover injection of some chest freezers components like: food basket, separation grill, side grills, side joint, handle, control board, legs, gasket spacer, inner lamp diffuser, holders, taps etc. These parts are injected out of polystyrene (PS), ABS, polyethylene etc.
The following equipment was installed on the line:
- Automatic machine for plastic parts injection NEGRI BOSSI – bigger one;
- Automatic machine for plastic parts injection NEGRI BOSSI – small one;
- Plastic grinding mill.

v) Top cover and cabinet assembly line:
This line is for assembling of chest freezer top cover (made of plastic coated sheet-metal, inner door and magnet gasket) and chest freezer cabinet (by joining the outer liner of plastic coated sheet-metal and inner liner made of aluminum plate).

vi) Polyurethane foaming line:
Consists of the line where the injection of polyurethane mixture (isocyanate, polyol and the refrigerant) under the pressure of 150 bars into the shaped cabinet and the top cover is performed. The injected mixture expands, and then becomes rigid, forming the insulation wall of 55 mm in thickness.
The following machines were installed on the line:
- Automatic SAIP machine  for injecting polyurethane into chest freezer cabinet;
- Automatic ACOMPACT 40 FC machine for injecting polyurethane into chest freezer top cover.

vii) Assembly line:
It consists of assembling the compressors with the accessories, electric components, condenser and hinge on the products.

viii) Refrigerant charging line:
It is the line where the refrigerant R134a is charged into the system. After that, an autogenously welding of the closed system is performed.
On this line it was installed:
- Refrigerant charging machine HABILIS.

ix) Quality control line:
Consists in continuous control and inspection of the finished product which means:
- Checking the electrical installation for safety;
- Earthing control;
- Refrigerant leakage test;
- Freezing temperature performances control on each unit for 24 hours.

x) Cleaning and finished product packing line:
It consists in detail cleaning of product and later packing by the automatic packing machine.
The installed machine in the line is:
- Pneumatic packing machine with welding device.