How does viscosity affect injection molding?

The higher the viscosity, the more friction that exists, so the more pressure you need to inject it into a mold. As you can imagine, a viscosity change could greatly affect how your process runs, leading to poor quality parts when nothing else has changed.

What is viscosity curve in injection molding?

For those new to Scientific Molding, the viscosity curve is a plot of the viscosity of a polymer vs. shear rate (see graph). Data is obtained by doing this experiment on an injection machine with the mold and resin you plan to run.

Why viscosity is important in plastic manufacturing process?

Therefore, viscosity is especially important for polymer processing. If a material is more resistant to flow and you must make it flow anyway, you have to provide more force and adjust other conditions, like temperature. You should not select a polymer with a low melt viscosity, for ease of processing.

How does injection Moulding affect the structure?

Injection moulding enables complex shapes to be mass-produced with a high level of efficiency and manageable costs. A wide selection of materials allows engineers to exactly match the physical properties they require for any given product.

What is hydraulic oil viscosity?

Hydraulic oil viscosity determines the selected fluids film strength and thickness in machines. A fluid with low viscosity will flow faster and that with higher viscosity will flow slowly. Hydraulic oil viscosity can be categorized in dynamic (absolute) viscosity or as kinematic viscosity.

What does hydraulic oil do?

Hydraulic oil delivers power, lubricates components, dissipates heat, and carries away contaminates. To perform these functions, hydraulic oils contain specific additives to enhance their ability to stand up to the pressure, temperature extremes, and other operating conditions to which they are subjected.

How to maintain injection molding machine lubrication?

The central lubrication system is one of the essentials of current injection molding machines. The amount of oil in the central lubrication system should be checked regularly for fullness, and the lubricant used must be clean and free of impurities to ensure that there is lubricant supply at all lubrication locations.

What happens if hydraulic oil is not used properly?

1) Hydraulic oil quantity: Insufficient oil will cause the oil temperature to rise and the air to dissolve into the oil, which will affect the oil quality and the normal operation of the hydraulic system. The shortage of oil is usually caused by oil leakage or loss during repair.

What is the ideal working temperature of hydraulic oil?

2) Hydraulic oil temperature: The ideal working temperature of the hydraulic system should be between 45 ℃ and 50 ℃.

What is the effect of oxidation on hydraulic system?

The insolubles such as wood tar, oil sludge and carbon residue generated by oxidation will pollute the hydraulic system and increase the wear of hydraulic components, reduce various gaps, block small holes, and ultimately cause Failure of the hydraulic system.