How to solve the problem of uneven infrared heating temperature?

- Oct 19, 2020-

How to solve the problem of uneven infrared heating temperature?

 

Leather often needs a certain texture. In order to get closer to the appearance and touch of real leather, it is necessary to emboss the leather surface. Rolling on the leather surface at room temperature, the texture is not obvious, and it is easy to rebound. At this time, it is necessary to heat the surface of PVC or PU leather. Due to efficiency and process reasons, the leather roll material needs non-contact heating. In this case, infrared heating is the best choice.

 

According to customer feedback from leather manufacturers, the current heating method of their embossing machine uses very thick quartz tubes, each with a length of 1.8 meters, 33 pieces are arranged on a heating length of 2.5 meters, and the production speed is 4m/ min; that is, it takes nearly 40S to heat the leather from room temperature to 130 degrees, and the ideal temperature is 150-160 degrees.

 

The reaseon of uneven temperature:

First, because the heating tube is 1.8 meters long, due to structural reasons, the temperature in the middle will be higher. When you adjust the temperature of the heating tube, this temperature difference cannot be eliminated.

Second, for the entire heating furnace system, the heat loss on the outside is obviously more than that in the middle area, so it will also cause uneven temperature.

 

Outgoing line problem: due to the width of 1800mm and the uniformity of the heating tube itself, there is also a heat accumulation effect, so that no matter how you adjust, the temperature on both sides is always lower than the middle, resulting in the embossing effect on both sides of the product. To the request.

 

In order to improve production efficiency and solve the problem of temperature unevenness, we re-tested and selected more efficient heating elements, and redesigned the temperature zone layout of the heating furnace.

 

We use a more gentle and efficient infrared heater for testing and heating this kind of PVC leather. The test data is that the heating starts at room temperature, and it only takes 14S to reach 160 degrees, and the leather surface is wrinkle-free and relatively flat. In terms of efficiency, the customer's production line speed can more than double.