It mainly presses powder materials into sheet components of specific shapes through processes such as pressurization and sintering. The following is a detailed introduction to the resistor sheet press:

Main functions

- Powder molding: metal oxides (such as ZnO varistor materials) or ceramic powders are pressed into round sheets, square sheets and other shapes under high pressure.

- Pre-sintering treatment: Some presses integrate heating functions, and perform preliminary sintering while pressing to improve the strength of the blank.

- High-precision control: Ensure that the thickness, density and uniformity of the resistor sheet meet the performance requirements of electronic components.

Core structure composition

- Hydraulic/mechanical pressure system: Provide high pressure (usually tens to hundreds of tons) to ensure that the powder is tightly molded.

- Mold system: Replaceable molds (such as round, rectangular) to adapt to resistor sheets of different sizes.

- Feeding device: Automatically fill powder materials to improve production efficiency.

- Control system: PLC or CNC system, adjust parameters such as pressure, holding time, pressing speed, etc.

- Heating module (optional): Some equipment is equipped with a heating plate for pre-sintering.

Workflow

Powder filling: Fill the mixed resistor material powder into the mold cavity.

Pressing: The upper mold is pressed down and high pressure (usually 50-300MPa) is applied to form a dense green body.

Pressure holding: Maintain pressure for a period of time to reduce internal pores.

Demolding: Eject the molded resistor sheet and enter the subsequent sintering process.

Technical features

- High pressure accuracy: Small pressure fluctuations to ensure batch consistency.

- High degree of automation: Support continuous production and reduce manual intervention.

- Environmental design: Closed operation prevents powder from flying.

- Adjustable parameters: Pressure, speed, temperature (if heated) are programmable.

Application fields

- Varistor: such as ZnO resistors used in lightning arresters.

- Thermistor: such as NTC/PTC temperature sensors.

- Multilayer ceramic capacitors (MLCC): Some processes are similar.

Selection points

- Pressure range: Select tonnage (such as 100 tons, 200 tons) according to material density requirements.

- Mold compatibility: Whether it supports fast mold change.

- Control mode: Manual, semi-automatic or fully automatic.

- Additional functions: Whether heating, vacuum degassing, etc. are required.