Metal Screen Electrical Heating Elements for Plastic Molding Machine , Heating System

Metal Screen Cartridge Heaters for Plastic Molding Machine Heating System

Description:

The cartridge heater may be divided in 7 main parts:

Heating Coil; Insulation; Sheath; Sealing; Termination; Lead Wire Type; Watt Density

A cartridge heater is a tube-shaped, heavy-duty, industrial joule heating element electrical resistance used in the process heating industry, usually custom manufactured to a specific watt density, based on

its intended application. Highly compacted they reach a surface watt density of up to 50 W/cm².

Insulation is used to prevent the Nichrome coil to contact the sheath. If such event happened, it would ground the resistance and potentially produce a catastrophic short-circuit, resulting in a melted sheath and a major equipment failure. Damage can be mitigated by installing a ground fault interrupting circuit. To prevent the coil from touching the sheath, the coil is inserted into the sheath, and immediately filled with Magnesium Oxide (MgO). To ensure the MgO fills the empty space between the sheath and the coil, the cartridge heater is vibratory filled.

The sheath is the part of the cartridge heater which makes contact with the material or substance to be heated. Several metal alloys are used, depending on the type of application, such as highly acidic or corrosive environments. The most common types of sheaths are 304 Stainless Steel, 316 Stainless Steel, and Incoloy 800. Incoloy has the highest temperature rating, it is considered a Superalloy.

After the cartridge heater has been filled with MgO, a seal is applied to the open end of the cartridge heater (where the Nicrome coil was introduced), this prevents the coil and the MgO from coming out.  Also, it prevents contamination, such as plastic debris, air, or moisture, to go inside the heater.

Since cartridge heaters are installed in a wide variety of machines, manufacturers must design the heaters to meet certain clearances.[5] [dead link] The cartridge heaters might be terminated with the leads coming out straight, or in a right angle. Also, manufacturer must be careful that the leads are not exposed to temperatures higher than the maximum rating for the lead wire. In order to prevent lead wire damage from temperature, movement or contamination, the lead wire can be protected with metal conduit, braided metal or silicone sleeves.

Specifications:

1. Resistance wire: NiCr20/80

2. Insulation: Magnesium Oxide Powder

3. Sheath material: stainless steel304,316,321,incoloy800, incoloy840

4. Voltage supply:110v,220v,230v

5. Wattage supply:0.5kw-15kw optional

6. Diameter:6-25mm

7. Lead wire length:20-30cm

8. Wattage tolerance:+5%/-10%

9. Length tolerance:±5%

10. Water proof:IP65

Applications

1. Seal Bars

2. Torpedo Heaters for injection molding

3. Injection molding manifolds

4. Mass Spectrometry

5. Rubber molding

6. Food production

7. Immersion Tank heating

8. HVAC Compressors

9. Fuel Cell

10. Semiconductor

11. Medical Devices

12. Sensor measurement devices

13. Extrusion

14. Die Casting

15. Hot melt adhesives

16. Heat Staking/ Hole Punch

17. Plastic welding

18. Fluid heating