Back
 Twist
Water
Cooler
Machinery description
· Hot Holding - Linear type with Steam Flushing
Composed of:
CONVEYOR UNIT
· Belt supporting structure
· Composed of stainless steel profiles, sheet and conveyor guides. Plastic lining mounted on the conveyor guides is made of heat-resistant plastic material.
· Conveyor heads and shafts made of stainless steel. Drive by means of gear motor controlled by frequency converter.
· Stainless steel flexible belt
· Composed of two lateral stainless steel chains, transversal stainless steel rods and stainless steel wire mesh.
· The belt allows for good free passage of water and assures good surface for bags-pouches support.
STEAM FLUSHING SYSTEM
· Primary perforated collectors for proper steam distribution into the chamber.
· Double manual valves, in series, for steam control.
· Suction hoods to exhausting the steam.
ENCLOSURE
To ensure steam and fog containment.
Composed by:
· Upper inspection hatches
Made in stainless steel sheets and insulated for high temperatures with an intermediate layer of rock wool.
· Twist Water Cooler - Working with 2 Water Circuits – Cooling Stages
Composed of:
Completely in stainless steel AISI 304, food grade heat resistant plastic material, with low grip coefficient.
Complete with:
CONVEYOR UNIT
· Conveyor drive group
A central drum drives the flexible belt by means of dynamic friction.
The drum is made as per “watertight design” cylinder.
The drum is made of stainless steel guides, fitted with friction profiles made in specific plastic material for such application.
The drum itself is driven by special gear motor coupled directly on the main shaft. An auxiliary belt-tensioning “as secondary drive unit” is mounted on the belt discharging end.
· Spiral supporting structure
Composed of stainless steel columns, beams, and conveyor guides. Plastic lining mounted on the conveyor guides made in specific plastic material for such application.
· Flexible belt
Composed of two lateral stainless steel chains, transversal stainless steel rods and stainless steel wire mesh.
The belt allows for good free passage of steam – water and assures good surface for bags-pouches support.
· Belt tensioning group
Equipped with adjustable counterweights to cope with length variations of the belt due to temperature. Due to the machine design this is placed at the belt end side.
LATERAL PROTECTIONS
· Totally in stainless steel with transparent section to see the system in operation.
· Protections open able execution as per “sliding doors”.
WATER RECYCLE AND DISTRIBUTION
Designed to have 2 water circuits 1st and 2nd stage, able to provide the ideal water distribution on the products.
1st effect: Recycle water distribution circuit “by falling water”
- Piping circuit connected to each supporting frame.
- Special nozzles for homogeneous distribution of a certain quantity of water onto the pouches. The nozzles are installed in such a way as to spray on upper face of the pouches and to avoid water pocket/stagnation. Heat exchange is increased by spray-water falling in the lower tiers, following the “counter current” working principle.
2nd effect: Recycle water distribution circuit “by impact”
This is installed on both spiral supporting structures, and is complete with:
- Piping circuit connected to each supporting frame.
- Nozzles designed to create a strong impact “kind of hydro-massage” onto the pouches in order to improve the thermal heat transfer.
WATER CIRCUIT
Basically the cooling water is controlled and collected by the tank.
Underneath circular tray-apron for water collection.
· 1st effect: water circuit (Product Outlet upper level)
· 2nd effect: water circuit (Product Inlet lower level)
FILTRATION SYSTEM FOR FRESH WATER
Complete with two (2) basket “static F1 & F2” filters (one in stand-by) with automatic valves controlled by the inside pressure.
Operator manually has to clean the “dirty one” when needed.
* these data need to be verify and/or may vary in accordance to the distance between the TWC and water treatment system.
CONTROL BOARD
with stainless steel frame, equipped with:
· PLC and 6” touch screen interface to control the following parameters:
- dwell time
- water temperature
- alarm messages.
· Inverters for belt speed adjustment.
· Siren and alarm warning light
· Pushbuttons and switches
Full process automation system powered by PLC: work cycles are completely automatic; parameters can be changed/controlled.
On-board wiring
Cable trays made of stainless steel wires, open-type.
Wiring, connections, safety, switches and internal lighting of the cabin suitable for wet environment.
· DESCENDING CONVEYOR BELT
To connect the Cooling system with the packaging section.
Composed of:
· Stainless steel frame with sliding guides with low friction coefficient plastic material
· Adjustable foots
· Stainless steel flexible mesh belt, driven by gear motor controlled by inverter
· DRYING SYSTEM
· To dry up the wet pouches immediately after coming out from TWC system. This is positioned on the descending conveyor belt.
Working principle
This is a Twist Water Cooler “TWC” with 2 stages water cooling system. Water is circulated through centrifugal pumps on each stage and all stages are connected according to counter-current principle.
1st Stage: (LOWER LEVEL) products coming from hot filling at ~90°C , meets first the circulated water of the 1st cooling stage at 10 - 30°C approx., (in accordance to the season and weather condition) in recycle from a Cooling Tower (EXCLUDED).
2nd Stage: (UPPER LEVEL) then products is finally cooled by fresh water at max 23°C or lower, in order to have a final temperature around 42°C ±2°C, and in any case lower then 45°C.
Water circulation concept:
On each TWC drum the water collecting tanks are placed underneath
1st Stage:
Water is pumped to a Cooling Tower (EXCLUDED) and recycled back, then sprayed into pouches. Specific nozzles assure a proper water distribution and results in accordance to the pouches sizes.
An overflow is discharging the excess of water in the next stage.
2nd Stage:
Specific nozzles assure a proper water distribution and results. The temperature of water has to be max 23°C or lower. Water fall through the lower tiers having a counter current thermal exchange. A valve, manually regulated provide to control the water temperature.
N.B. TWC will be produce ready for cooling tower water circuit and for fresh water one, but at the beginning the system will work just with fresh water. The discharged water will be conveyed either in the existing collecting point, to be recycle into the tomato unloading system during season, or out of the season into water treatment system.
| 
