TechnoDigm Malaysia

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TechnoDigm provide the complete solution in fluid dispensing and UV curing, aim to provide the excellence engineering in the field of research and development. TechnoDigm closely works with industrial material suppliers as well.

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The Main Types of Dispensing Valves: Where Do They Work Best

Dispensing valves are designed to provide precise dispensing of industrial fluids depending on their applications. They provide reliability and accuracy in fluid control during fluid dispensing process. There are different types of dispensing valve systems. They can control tens of millions of trouble-free cycles before maintenance is required. Dispensing valves are ideal for bench top applications and automated dispensing systems. Check out these main dispensing valve systems and where they work best.

1.Diaphragm Valves:  Diaphragm valve is designed for precise control of low to medium viscosity liquids. They are light-weight and easily maintained. They can perform high-cycle dispensing of many low-to-medium viscosity fluids such as solvents, cyanoacrylates, anaerobics, fluxes, and UV-cure adhesives. Diaphragm valves accurately place small dots and fine bead patterns.

2.Positive Displacement Valves: Positive displacement valves can drive high viscosity fluids and also meter them in very precise amounts. They are used in automated fluid dispensing system to deliver highly accurate micro deposits of fluids. Positive displacement valves can do dot dispensation, which is generally measured in mils. They can also be used to dispense glue and other cements for accurate filling applications. 

3. Needle Valves: They are perfect for micro-shot deposits for industrial fluids. Needle valves can be adjusted when used for the high pressure and high viscosity materials. However, they are most suitable for applying beads of low-to-medium viscosity fluids.

4. Spray Valves: Spray valves are ideal for low-viscosity materials. They are used in spray coating systems. Spray valves ensure atomization takes place prior to material flow as it prevents clogging, which is common with industrial fluids.

Apart from above mentioned four valve systems, there are spooler valves, pinch-tube valves, and poppet valves. Dispensing valves are used for repeatable micro dispensing of a range of industrial liquids. Whether mounted on automated dispensing equipment or hand-held machine, dispensing valves are ideal for any dispensing solution. However, before purchasing valve system, do consider how the valve works, fluid characteristics, and how the material will be applied. This will simplify the dispensing valve selection process.

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Why Use Air-Free Fluid Dispenser for Problem-Free Cyanoacrylate Dispensing

Cyanoacrylates are strong fast-acting adhesives with industrial and medical uses. They are typically used for high-performance bonding of numerous materials such as polystyrene, wood, metal and latest generation plastics. Cyanoacrylates cure at room temperature, and are available in different viscosities to fit your exact requirements. There are certain things that can affect the bonding performance when using cyanoacrylates for materials.

• If too much cyanoacrylates adhesive is dispensed, it can keep the bond from curing properly while if too little adhesive is used, it can cause the bond to fail. • The manufacturing or assembly unit’s environment affects your dispensing process. Humidity can alter the viscosity of the adhesive material and can impact bond between two components. • Incorrect pressure or vacuum level in dispensing system can create air bubbles, thus rendering your dispensed cyanoacrylate less effective. • Cyanoacrylate’s viscosity should be taken into consideration when determining dispensing settings to achieve the best results.

Automated Dispensing is the Best Solution

An automated air-free fluid dispenser is perfect for handling cyanoacrylate (CA) adhesives. Automated fluid dispensing equipment is designed specifically for cyanoacrylate dispensing to achieve optimized performance for all CA applications. They feature positive displacement system that helps to remove air from the dispensing process.  Positive displacement pump utilizes drive mechanism to deliver precise amount of CA without using compressed air, so there are no chances of creation of air bubbles in dispensed material. They have a syringe reservoir that is available in different sizes, making automated dispensers ideal for dispensing CA during assembly process.

Some automated fluid dispenser can handle all types of viscosities and are ideal for small dot and long bead dispensing. It also resolves the problem of curing within the dispensing setting as there is no contact between motorized parts and the adhesive material. Only automated fluid dispensing system has a good positive shut off that dispense material without dripping.

Evaluate your manufacturing unit’s needs, environment, buy best quality cyanoacrylate adhesives, and purchase the best automated fluid dispensing system from a reliable manufacturer in Malaysia or from your local company to ensure you get the best results.

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3 Common mistakes to avoid during dispensing light curable adhesives

Light cure adhesives are special adhesives that cure quickly when exposed to UV light of the appropriate wavelength and intensity. They are solvent free and react with various adhesive structures such as metals, glass or other surface. From medical devices to automobiles, UV light cure adhesives are used in many bonding applications.

Their high transparency, faster curability, low shrinkage and viscosity make them best suited for precision fixation. You can find a wide range of liquid dispensing and UV curing systems for adhesives, depending on the viscosity and curing speed you need. There are many common mistakes that can be made when dispensing light cure materials. Check out how to avoid these pitfalls during the assembly process:

• Incompatible Substrate: Light curable adhesives are suitable for plastic-to-plastic, plastic-to-metal, glass-to-glass, and glass-to-metal substrates. Materials that are compatible with light-curable adhesives include polyethylene, polypropylene, nylon, Teflon, glass and acetals. Avoid substrate materials that contain resin.

• Trapped Air Pockets: There are three primary causes of air bubbles in a bond line - insufficient adhesive, dispensing process and air entrapment. You can avoid bubbling air through the adhesive by loading the dispensing system slowly, minimizing adhesive shrinkage or inconsistent flow, modifying dispense pattern to remove overlapping layers of adhesive, and storing adhesives in upright position. When dispensing the adhesive, purge the system to force out air bubbles out of the nozzle.

• Vacuum Pressure: Some dispensing systems feature a suck back valve that applies vacuum pressure to prevent the return of the adhesive and its drip following dispensing. When excessive vacuum pressure is applied, air bubbles are produced in the adhesive, which alter its performance as well as shelf life. Keep the pressure at a normal working level to minimize introduction of micro air bubbles in the adhesive. The best way to avoid air bubbles is to reduce the distance between the cartridge and the valve.

High-performance, UV light curable adhesives are suited for bonding application in various industries including electronics, optical industry & medical technology. When you use incompatible substrate material, apply excessive vacuum pressure or introduce air bubbles in the bond line, then they can result in the failure of bonded components. Avoid these pitfalls to ensure successful bonding of different components during the assembly process. Make sure you buy high-quality liquid dispensing and UV curing system from a reliable manufacturer in Malaysia or your local area if you want to increase productivity and end product quality and performance.