Syringe Silver Paste Stirring‑Defoaming Solution


Syringe silver paste is widely used in precision electronic packaging, LED chip mounting, semiconductor packaging and other fields, with extremely high requirements for bubble control. Micro‑bubbles introduced during silver paste production and filling will cause dispensing interruption, unstable electrical conductivity and reduced bonding strength. Leveraging self‑developed vacuum stirring‑defoaming technology, SIENOX controls the full silver paste defoaming workflow with nano‑level precision and delivers closed‑loop solutions covering materials to manufacturing.


Working Condition Requirements

• Material Types: Syringe silver paste materials (conductive silver paste, dispensing silver paste, packaging silver paste, LED silver paste, semiconductor silver paste, RF silver paste, flexible‑circuit silver paste, anisotropic conductive silver paste, etc.)

• Initial Status: Micro‑bubbles are mixed into syringe silver paste during production and filling. Silver paste features high viscosity and poor fluidity; bubbles are trapped inside and hardly escape naturally. Bubbles after syringe filling lead to dispensing interruption and bubble voids, impairing electrical conductivity and bonding reliability.

• Processing Target: Thoroughly remove micro‑bubbles from syringe silver paste, ensure uniform, fine and bubble‑free silver paste. Avoid dispensing interruption and bubble voids during dispensing, stabilize electrical conductivity, and satisfy high‑precision requirements for precision electronic packaging, LED chip mounting and semiconductor packaging.


Comparison Before and After Improvement

Before Improvement — Pain Points of Traditional Processes:

• Residual bubbles after syringe filling: After silver paste is filled into syringes, bubbles are sealed inside. Conventional static defoaming delivers extremely low efficiency with massive residual bubbles after filling.

• Dispensing interruption & bubble voids: Bubble‑containing silver paste causes dispensing interruption and bubble voids, resulting in discontinuous conductive circuits and severely lowering product yield.

• Unstable electrical conductivity: Bubbles break conductive paths and increase contact resistance, degrading performance and reliability of electronic products.

• Reduced bonding strength: Bubbles decrease contact area between silver paste and substrates, lowering bonding strength and triggering debonding‑failure risks.

• Difficult precision control: Syringe dispensing demands high precision; bubbles cause uneven paste output and impair dispensing accuracy and consistency.

• Poor batch‑to‑batch consistency: Traditional defoaming takes long time with unstable results and large quality variations among batches.

 

Solution — SIENOX SIE‑MIX90 Planetary Vacuum Stirring‑Defoaming Machine:

With the combined effect of “vacuum negative pressure + dynamic stirring”, professional stirring‑defoaming solutions are provided for syringe silver paste materials:

1. Dual defoaming via vacuum stirring: Adopt SIE‑MIX90 planetary vacuum stirring‑defoaming machine for dynamic stirring under vacuum environment to rapidly throw out and thoroughly eliminate micro‑bubbles inside syringe silver paste.

2. Nano‑scale bubble removal: Effectively remove nano‑sized micro‑bubbles in silver paste for uniform and fine texture, free of dispensing interruption and bubble voids during dispensing.

3. High capacity adaptability: Support multiple‑specification syringes and containers, covering lab‑scale small‑batch tests to mass production.

4. Precise multi‑segment parameter control: Adjustable multi‑segment rotating speed, time and vacuum degree to fit stirring‑defoaming demands of silver pastes with different viscosities.

5. Excellent batch‑to‑batch consistency: Automated operation with replicable parameters to guarantee consistent defoaming performance for every batch.

6. Enhanced electrical conductivity: Continuous and stable conductive paths after bubble removal reduce contact resistance and greatly improve electrical conductivity.



Sample Provider: Electronic packaging manufacturer

Test Conditions

Item

Parameter

Test Model

SIE‑MIX90 Planetary Vacuum Stirring‑Defoaming Machine

Test Material

Syringe silver paste (conductive silver paste)

Rotating Speed

1800 rpm

Time

4 min

Vacuum Degree

-95 KPa

Stirring‑Defoaming Effect Comparison

Silver Paste Raw‑Material Solution_02.jpg

Comparison Dimension

Before Stirring‑Defoaming

After Stirring‑Defoaming

Bubble Content

Massive micro‑bubbles, non‑uniform silver paste

Nano‑scale bubbles thoroughly removed, uniform and fine texture

Dispensing Performance

Dispensing interruption & bubble voids, low yield

Continuous and uniform output, no interruption or voids, greatly improved yield

Electrical Conductivity

Discontinuous conductive paths caused by bubbles, high contact resistance

Continuous and stable conductive paths, reduced contact resistance

Bonding Strength

Reduced contact area due to bubbles, insufficient strength

Sufficient contact area, stable and reliable bonding strength

Dispensing Accuracy

Uneven output caused by bubbles, poor accuracy

Uniform and stable output, greatly improved dispensing accuracy

Batch Consistency

Unstable defoaming performance, large batch‑to‑batch variation

Replicable parameters, favorable batch‑to‑batch consistency


Mature Application Fields

• Conductive silver paste (electronic circuit printing, conductive adhesive, electromagnetic shielding)

• LED silver paste (LED chip bonding, LED packaging, LED lamps)

• Semiconductor silver paste (chip packaging, wafer bonding, IC packaging)

• Dispensing silver paste (precision dispensing, SMT mounting, surface‑mount technology)

• Packaging silver paste (electronic‑component packaging, module packaging, device packaging)

• RF silver paste (RF circuits, antennas, microwave devices)

• Flexible‑circuit silver paste (flexible PCB, flexible displays, wearable devices)

• Anisotropic conductive silver paste (ACA/ACF, anisotropic conductive adhesives)