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What are the main tasks of the vacuum sealing unit
source：www.cnkaihui.com | Release time：2026年08月18日The entire unit is divided into six modules according to the process: raw material pretreatment, vacuum chamber environment preparation, metering and mixing, vacuum infusion, pressure holding and air breaking, and auxiliary closed-loop control.
1、 Raw material storage pretreatment work (glue supply unit)
1. Constant temperature control: The A/B components are heated in independent buckets to reduce the viscosity of the glue, improve flowability, and prevent high filler resin from settling;
2. Low speed stirring: Continuous stirring to avoid sedimentation and layering of fillers such as alumina and aluminum hydroxide;
3. Pre foaming of raw materials: Independent vacuum degassing inside the material barrel to remove dissolved air in the glue in advance and reduce the source of injected bubbles;
4. Liquid level monitoring: automatic alarm for low material level, supporting automatic replenishment; Partial systems are equipped with nitrogen protection to prevent the curing agent from absorbing water and deteriorating.
2、 Vacuum chamber system operation (core negative pressure environment)
1. Workpiece loading and cavity sealing: The workpiece/mold is sent into the vacuum chamber, the chamber door is sealed, and the sealing components are leak checked;
2. Vacuumization and pressure maintenance: The vacuum pump group extracts air from the chamber to reach the set vacuum degree (conventional -0.085~-0.098MPa, process can reach mbar level) and maintains pressure;
Extract the air trapped inside the winding, gap, and cavity of the component;
3. Real time monitoring of vacuum degree, automatic alarm for leakage exceeding the standard;
4. After the sealing is completed, slowly break the air: restore normal pressure, use the atmospheric pressure difference to push the glue further into the small gaps, and reduce the cavity.
3、 Precision measurement and mixing unit (key to proportioning accuracy)
1. Correct metering and conveying: The servo piston pump/gear pump extracts A glue and B glue according to the set ratio; The ratio error is generally controlled within ± 1%;
2. Uniform mixing: The glue liquid enters the static mixing tube (or dynamic mixing head) and fully fuses;
3. Anti drip control: switch the dispensing valve, stop the machine to prevent dripping glue from contaminating the workpiece;
4. Regularly clean the mixing pipeline to prevent the mixing glue from solidifying and blocking the pipeline.
4、 Vacuum infusion operation (core process)
1. Start injecting glue while maintaining negative pressure in the cavity;
2. Fixed point/three-axis mobile injection: The injection nozzle follows the trajectory and injects quantitatively into the mold cavity;
3. Advantages of negative pressure environment: The glue flows without air resistance, smoothly fills deep cavities, narrow gaps, and multi-layer winding structures, and is not easily trapped by air to form pores;
4. Real time observation of the infusion liquid level through a visual window to prevent overflow or shortage of glue.
5、 Process pressure maintenance and post-treatment procedures
1. After the glue filling is completed, a vacuum pressure holding period can be set to allow residual small bubbles to float and burst;
2. Slowly break the air to avoid sudden pressure changes that may cause the glue to reflux and generate new bubbles;
3. Exhaust the chamber, release the vacuum, open the chamber door, unload the workpiece, and transfer it to the curing oven.
6、 Control system and safety assistance work
1. The entire process runs automatically in sequence: vacuum pumping → pressure holding → infusion → pressure holding → air breaking, with parameters that can store formulas;
2. Real time collection of vacuum pressure, temperature, adhesive output, and ratio, supporting production data traceability;
3. Automatic alarms for overload, overheating, vacuum leakage, material shortage, and pipeline blockage;
4. Exhaust gas collection and explosion-proof protection (for low volatility/flammable resin systems).
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