After fill MGO powder or MGO rod for the heater by sand filling machine, it need to reduce to increase density. By shrinking the heaters, it can up to about 3.5 g/cm3, to meet the requirement for electrical equipment.

How to reduce heater? At present, there are mainly two method to shrinking heater - swaging and rolling.

Swaging machine mainly for small quantity, and in various diameters heaters, such as cartridge heaters. heater shrinking machine

Rolling machine - mainly for heaters in bulk production reducing. Such as tubular heaters, large quantity cartridge heaters, coil hot runner heaters.

There are many different styles of rolling reducing machine in Feihong, which can reduce from 2-45mm, length from 30mm to no limit, suitable for round heater, square heaters, oblate heaters. So, how to choose the best shrinking machine to make heaters?

Here are some tips to choose shrinking reducing machines:

*** Short heater shrinking machine - this machine solve the problem of difficulty and low efficiency of short heater heating tube in shrinking, suitable for cartridge heaters, cartridge heater for cars, etc.

***mini shrinking machine without gearbox - mainly designed for small diameter and small heater reducing, it is recommended for small heaters within 2-5mm, such as hot runner heater reducing etc., For example, for small round heater, square heater, oblate heater, flate heater. Feihong can make 8 station reducing machine, 10 station reducing machine, and 12 station reducing machine for this style reducing machine. The more stations, the heaters will be more round and smooth after reduced.

*** shrinking machine without gear box - a common style of shrinking reducing machine in Chinese market. This style is quieter than the B style machine. According to the diameter of the heater and the station of the shrink machine, it is recommended to reduce the medium and small diameter heater within 2-16mm, such as hot runner heater and round heater with small diameter, square heater, flat heater and elliptical heater. Feihong can make 8 station, 10 station, 12 station, 14 station and 16 station for this style reducing machine. The more stations, the heaters will be more round and smooth after reduced.

*** shrinking machine with small gear box - used for general heating elements shrinkage, it is recommended to shrink the medium and small tube shrinkage within 2-18mm, such as hot runner heaters and round heaters in small diameter, square heaters, flat heaters and elliptical heaters. Feihong can make 8 station, 10 station, 12 station, 14 station and 16 station for this style reducing machine. The more stations, the heaters will be more round and smooth after reduced.

*** shrinking machine with gear box - Feihong's popular B-type shrinking machine. This type of tube shrinking machine with large torque and larger strength, and is more suitable for reducing with large diameter and high density heaters. It is recommended to reduce the medium and large heater shrinkage within 5-30mm, such as hot runner heaters and round heaters with larger diameters, square heaters, flat heaters and elliptical heaters. Feihong can make 8 station, 10 station, 12 station, 14 station and 16 station for this style reducing machine. The more stations, the heaters will be more round and smooth after reduced.

PS: One shrinking machine with a gearbox, like a lever, can remove some of the force of a part such as a motor, so that the life of the shrinking machine will be longer. So most of heater factories prefer our B style reducing macines.

*** large shrinking machine - Feihong designed for the special requirements of large diameter and high density elements. At present, it is mainly used for MI cable shrinking. It is recommended to use round, square, flat and elliptical within 10-45mm. Usually make 14 station and 16 station for this shrinking machine.

*** Flat heater shrinking machine - used for flat heater shrinking tube, such as railway snow melting strip heater shrinking machine, fryer heater shrinking machine, etc.