INDUSTRIAL AND COMMERCIAL INFRARED SYSTEMS DESIGNED FOR YOUR APPLICATION
Infrared conveyor tunnel ovens are designed for industrial applications such as heating and continuous vulcanization of silicon/organosilicon rubber materials (tube, profile, cord) on a moving conveyor belt.
These conveyor tunnel ovens are equipped with the ICH-100 series infrared ceramic emitters installed inside the heating chamber along the conveyor belt. Combined infrared-convection heating uses the additional energy of hot air to heat, cure, and stabilize the temperature of the heating processed products.
The horizontal infrared conveyor tunnel oven consists of 2 parts:
The second part may consist of one or several connected tunnel oven units. Moving conveyor belt sequentially passes through the heating chamber’s sections inside the most effective infrared heating area.
The heating chamber body has a detachable half-part cover opening at an angle of 150°. Opening this cover provides convenient access into the chamber for product loading, cleaning, inspection, minor repairs, replacing the conveyor oven elements or ceramic emitters.
The horizontal infrared tunnel oven is equipped with a conveyor belt made of polished stainless steel, and an automatic belt tensioning mechanism. Using the shock pre-vulcanization unit in combination with subsequent vulcanization, and stabilization of the product on a smooth steel conveyor makes it possible to process the products with literally no imprints of the conveyor belt left on the product.
EUROLINIA conveyor horizontal infrared tunnel oven can be additionally equipped with:
When several conveyor tunnel ovens are connected into a production line, it is possible to install a single master control panel with a built-in programmable logic controller that consolidates the functions of all individual control units.
Depending on your application EUROLINIA provides custom conveyor oven software that allows you to:
Infrared conveyor tunnel oven presented on the pictures above features the following specifications:
| One infrared heating section (heating zone) length, mm | 1950 |
| Heating chamber and the inlet (width x height) for material loading dimensions, mm | 150, 90х65 |
| Distance from the floor to the conveyor belt, mm | 1150±30 |
| Conveyor belt width (mm) and material | 100, stainless steel |
| Conveyor belt speed (smoothly adjustable), m/min | 1/20 |
| Number of regulated heating zones along the circumference of the heating chamber, pcs. | 3 |
| AC power supply voltage (50 Hz), V | |
| zonal electrical heaters (three-phase voltage) | 380 |
| infrared emitters (single phase voltage) | 220/230 |
| Electric power consumption, kW: | |
| rated consumption (starting) | 18 |
| operating consumption (air temperature inside the heating chamber below 350 ºС) | 9 |
| Conveyor belt drive Electric motor, electric power consumption, kW | three-phase, asynchronous, 0,55 |
| Ceramic emitters maximum temperature, °C | 450 |
| Accuracy in maintaining the preset temperature in heating mode, °C | ±1,5 |
| Ceramic emitters warm-up time until the preset operating temperature, min | 15 |
| Ceramic emitters cooling time until the temperature of maintenance and repair (45-50 °C) when switched off, min | 45 |
| Minimum life expectancy of HIT-C infrared tunnel, years | 10 |
| HIT-C infrared tunnel with 2 sections (without control unit) Dimensions (length x width x height), mm | 4300х790х1330 |
| HIT-C infrared tunnel (with control unit) Weight, kg | 350 |
Whenever infrared is used to heat, pre-dry, dry or cure continuously moving coil material - or a continuous flow of flat material placed on a conveyor - there is a risk of a natural phenomenon called the edge cooling effect. If the size of the material exceeds 24 inches across the machine, edge cooling will occur.
An infrared heater panel for a conveyor oven is an enclosure of some type containing one or more infrared emitters. The infrared output from a single infrared heater is usually the same along its entire length. However, the closer you are to the edge of the emitter, the closer you are to the external influences that affect the product. Whether the product is 24 inches wide or over 200 inches wide, the outside part or edges of the material will be subject to these external environmental influences. Typically, the primary external exposure is to the manufacturing environment.
Because the edges will be cooler, they will not heat, dry, or cure in the same way as the center portion of the material. If the material is fairly narrow (less than 24 inches wide), the temperature differential is usually very small. For a wider material, the temperature differential increases as the width of the material cross-section increases. For very wide materials, the differential may be 30°F (16°C) or more.
How can you adjust or change the infrared heater output used in industrial conveyor ovens, so that it is greater near the edges of the material than in the center, thereby equalizing the thermal profile of the material? There are usually three ways:
Placing the infrared emitters in a well-insulated box will minimize environmental influences. However, it does not eliminate the edge cooling problem. For example, wide material may appear with a temperature difference of 5 to 10°F (2.7 to 5.5°C) instead of a temperature difference of 20 to 30°F (11 to 16.7°C). Adjusted the emitters to add coils around the edges.
Using the infrared emitters with more coils at the ends than in the center will effectively cause them to emit more infrared energy in more tightly wound or concentrated areas. This solution is effective, but the output of the emitter is fixed in the center. No matter what voltage is applied to the emitter, the energy output at the edges will always be a fixed differential concerning the center. It will also be the same on the left and right, while the edge cooling effects may be different.
Move the emitters to the Machine Direction. Positioning the infrared emitters so that they operate in the machine direction (IMD) allows more or less power to be delivered to the emitters at the edges compared to the emitters in the center. This is the most widely used method for providing an edge cooling effect.
This method can be applied to infrared heaters using open emitters or quartz tube emitters, so it works well for medium or short wave heaters.
When infrared heaters are designed with emitters positioned in the machine direction, the width of the center area or zone can be adapted to the web. In addition, the width of the left and right zones can be calculated along the edges. Each zone will be independently controlled by its power and temperature controller. The left and right edges can be controlled together as a single zone, or they can be independent of each other, depending on the specific application environment.
While infrared heaters are usually limited in size to 22 inches or so in the direction of the machine, they can be as wide as 300 inches or more. A typical system will require several infrared heaters. Each heater applies intense infrared energy to the material as it passes the heater. One caveat: If the infrared emitters are not offset by a few degrees, it will result in an effect called interleaving. A heater with skewed emitters can provide perfectly uniform heating of the material as it moves over the area to be heated.
An infrared heater or system can be designed for almost any width of material to heat, cure, dry or heat the material evenly across its width and width. The width of each cross-directional zone of the machine can be controlled independently. The control can be done with the heater zone emitter temperature or with product temperature feedback using an infrared thermometer. For production situations with varying widths, an infrared system can be designed with the ability to cross-machine direction based on maximum and minimum widths to disable some edges when working with narrow materials, thus preventing energy loss.
Regardless of your process heating requirements, your infrared heating supplier should collaborate with you to provide the best possible solution for your particular heating, drying, curing, or temperature setting process.
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