In industrial adhesive production, selecting the right automatic dispensing machine and dispensing valve directly affects production efficiency and product yield. Newcomers often fall into selection pitfalls, leading to poor equipment compatibility and wasted costs. This concise guide highlights the core points, allowing beginners to choose the right equipment quickly—no complex technical knowledge required.
1. Define Core Requirements First to Avoid Blind Selection
The key to proper selection is compatibility. Clarifying these three essential requirements will save time and cost:
1.1 Know Your Adhesive Characteristics (Top Priority)
Adhesive viscosity and curing properties directly determine the type of dispensing valve:
- Low-viscosity adhesives (UV glue, instant glue) → Use valves with vacuum backflow to prevent dripping.
- Medium to high-viscosity adhesives (silicone, thermal paste) → Choose valves with strong thrust and precise flow control to avoid uneven dispensing.
- Two-component AB adhesives → Use specialized mixing valves. For suspending adhesives like solder paste or silver paste, prioritize valves with heating functions to prevent sedimentation.
1.2 Define Process and Precision Requirements
- Micro-precision dispensing (LED encapsulation, chip bonding) → Requires ±0.02mm repeatability with piezoelectric or precision screw valves.
- Large-area coating or potting (PCB conformal coating, battery modules) → Use high-speed machines with spray or plunger valves.
- Continuous sealing dispensing (automotive sensors, gaskets) → Use high-precision platforms with screw or pneumatic valves.
1.3 Determine Production Scale
- Small-batch, multi-product production → Modular platforms (e.g., 220-Z50 series) allow flexible valve replacement and program adjustments, reducing repeated investments.
- High-volume, continuous production → High-end machines with dual stations and vision-guided positioning support 24/7 operation and improve efficiency.
2. Automatic Dispensing Machine Selection: Focus on 3 Core Parameters
Avoid being distracted by unnecessary features. Focus on these three key parameters:
2.1 Positioning Accuracy
- Standard dispensing (hardware, toys) → ±0.05mm stepper motor machines.
- Precision dispensing (electronics, LED) → ±0.02mm servo motor machines with linear guides to minimize deviation.
2.2 Ease of Operation
Prioritize machines with handheld teaching and programming, Chinese interface, and graphical operation. Beginners can master them in 10–30 minutes without coding skills. Supports common trajectory editing.
2.3 Expandability
Choose machines with reserved interfaces for future upgrades such as vision guidance and temperature control modules to adapt to production growth and avoid repeat purchases.
3. Dispensing Valve Selection: Match Adhesive Precisely
Dispensing valves are the core execution components. Choosing the right type prevents stringing and leakage. Selection logic:
- Pneumatic valves → Suitable for low/medium-viscosity adhesives. Cost-effective and simple, ideal for small to medium batch production. High-viscosity adhesives require pressure boosters.
- Piezoelectric jet valves → Ideal for low-viscosity, micro-volume adhesives. Fast, high precision, non-contact, suitable for delicate applications. Higher cost.
- Screw valves → Suitable for medium/high-viscosity adhesives prone to sedimentation. Precise flow control, no stringing, can add heating to prevent sedimentation, ideal for precision and continuous sealing.
- Plunger valves → Suitable for high-viscosity adhesives. Strong thrust, stable dispensing, suitable for potting and large-area coating.
- AB mixing valves → Designed for two-component adhesives, adjustable ratio, uniform mixing.
4. Key Reminders for Beginners: Avoid Common Pitfalls
- Don’t blindly chase low price → Cheap machines may lack precision and stability, causing faults later. Choose reputable manufacturers focusing on dispensing accuracy and stability.
- Don’t ignore adhesive compatibility → Adhesive characteristics are critical. Using pneumatic valves for high-viscosity glue or screw valves for low-viscosity glue will compromise results.
- Don’t over-purchase redundant features → Select functions based on your actual needs to reduce cost and maintenance. Only meet your production requirements.
