BATCH-OFF SYSTEM [ACTION B.3]

Breve descrizione

Scope of the procurement is the realization of a Batch-off system to cool and treat a seamless rubber sheet of dimensions 750mm x 8mm, complete with palletising system, the machineries should be dimensioned properly to withstand a throughput rate of 2,500kg of rubber per hour.

Descrizione dell'appalto

The Batch-off system primarily must cool a seamless rubber sheet, dimensions 750mm x 8mm, from 100°C to 25/30°C: the cooling capacity must withstand a throughput rate of 2,500kg of rubber per hour. The system must also automatically collect samples, for quality control purposes, before treating the rubber sheet with an anti-tack water-solution coat. The rubber must be dried before being stacked in a wigwag arrangement on metallic skids: a palletising system suitable for completely hands-free operations. All sections of the batch-off system must be dimensioned properly to withstand the specified rubber sheet at the abovementioned throughput rate. All the structural parts that are in direct contact with the anti-tack solution and/or the rubber sheet must be manufactured in stainless steel, all the conveyor are impact, chemical and heat resistant Intralox link-chain belts.
The entire batch-off system must be provided with safety covers, electric locks on doors and light barriers to prevent the operators to enter or reach possibly dangerous area, adopting the necessary Health and Safety requirements appointed in the latest EU Machinery Directive.
Dip tank: the hot rubber sheet passing through the tank is submerged in the anti-tack water solution by the means of a pressure roll. The tank must have a dead-zone to settle solution solid particles; cleanout openings 200x300 mm (appropriately sealed) are designed for quick opening on both sides of the tank.
Cooling tunnel: the wet sheet hangs on anti-slip bars in the cooling tunnel, folded in loops deep 1800mm, with a pitch of 150 mm. High-efficiency and low-energy absorption fans blow air across the hanging sheets for drying and cooling, for which the overall installed airflow should be around 80.000m3/h at an outlet speed of approx. 10m/s. The tunnel has two access points for maintenance; a grate floor collects the water solution dripped from the rubber sheets and collect it in a separate tank. A step drive shifts the stock from the intake (behind the dip tank) through to the discharge position. A gripper takes out the beginning of the sheet and puts it on a take away conveyor. The conveyor transports the sheet via cutting device to the automatic stacking device.
Palletising system: an electro actuated gripping device automatically picks up the cooled and dried rubber sheet lifting it to the automatic cutting unit. The cutting device works on two axis: a transversal cut allows the pallet change, whilst longitudinal cut slits the sheet into several strips (adjustable widths). All the knives must be made in HSS working against a quenched steel anvil roll. The automatic stacking station allows the discharge of the rubber sheet on a skid as a seamless ribbon, a wig-wag pendulum must be foreseen to ensures high-folding precision. The skid change is completely automatic and hands-free, as a storage rack with 10 pallets capacity provides, by covered rails, the empty skid to the stacking station and subsequently places the fully loaded pallets into two buffer positions for forklifts take-away.

Condizioni di esecuzione del contratto

The only currency accepted for tendering and the subsequent contract is EUR, all payments will be in EUR.
Implementation period should be in four months since awarding the contract. In the adverse event where quality and/or time-based requirements have not been reached, penalties might apply to the Contractor.