Chamber oven

dryingcuringair circulating

Overview
For thermal processes in which solvents or other inflammable substances are released. AMARC designs and builds ovens able to ensure the maximum degree of safety in thermal processes where solvents or other inflammable substances are dried and cured.

Regulatory framework
Potentially explosive gases and vapours are generated during the drying, evaporation and curing processes in which products containing solvents are treated. The ovens used for these processes must conform to standard EN1539:2015. Application of this standard enables the maximum quantities of solvent in the oven to be defined as well as the required safety levels, depending on the temperature, type of solvent, thermal cycle, quantity of product and size of the oven. AMARC produces forced ventilation ovens applying standard EN1539:2015, directive ATEX 2014/34/EU and by studying the emissions and classification areas in accordance with EN60079-10-1:2015.

Design
Oven design is developed from research into the customer’s specific process. AMARC relies on the expertise of out-sourced analysis laboratories whenever it is necessary to assess the chemical/physical characteristics of the product during the heating stage for the purpose of optimizing the process and dedicated oven design. This ensures that the oven is created and therefore optimized both as to thermal performance and safety features.

Safety
The safety systems and components are made in accordance with the ranges established by standard EN1539:2015. Each oven is provided with a system for exhausting "dirty" air and replenishing with clean air, featuring a double flow rate calculated to suit the process. Oven control includes a PLC for the process and a PLC Safety to manage the safety chains.

Operation
The ovens operate in batch cycles, which include:

• 1. Loading stage
• 2. Prewash stage in accordance with EN 1539
• 3. Heating phase during which the target temperature is reached
• 4. Temperature maintenance stage
• 5. Cooling stage
• 6. Emptying stage

Optional
A custom-built product. There are many opportunities for customizing, ranging from the choice of materials to the structure of the base, door control, number of adjusting areas. The oven is also pre-engineered for integration into a production system according to Industry 4.0 logic and standards.

Materials (options)
The standard construction provides for external cladding in coated carbon steel and internal parts in galvanized steel. The oven can also be made of AISI 304 stainless steel (or another type of steel on request). The stainless steel option can be chosen for:

• The oven interior only
• The external cladding only
• Both interior and exterior (to obtain an oven entirely made of stainless steel)

Many accessories (control panel housing, ventilating unit, door closing systems) can also be supplied in stainless steel on request.

Oven Base (options)
Depending on the loading method and process, the base can be supplied as:

• Without base, installed directly on the factory floor
• In 3.0 mm thick sheet metal
• With an insulated structure, with or without trolley tracks

Technical specifications

• Applicable standards and directives: EN1539:2015; ATEX 2014/34/EU; EN60079-10-1:2015 for classification of hazardous areas
• Application: thermal processes where solvents or other inflammable substances are emitted (drying, evaporation, curing)
• Ventilation: exhaust and replenishment system with double flow rate sized to the process
• Control: PLC for process control; dedicated PLC Safety handling safety chains
• Design approach: customized to the customer process; use of outsourced analysis laboratories for product chemical/physical characterization
• Standard construction materials: external coated carbon steel; internal galvanized steel
• Optional materials: AISI 304 stainless steel available for interior, exterior or entire oven; stainless steel available for accessories
• Oven base options: floor-mounted (no base), 3.0 mm sheet metal base, insulated base with or without trolley tracks
• Operation mode: batch cycles (Loading; Prewash per EN1539; Heating to target temperature; Temperature maintenance; Cooling; Emptying)