Plunger lubricants FAQ

Can I use diluted water-soluble lubricants?

You can dilute these lubricants with water. However, doing so may lead to problems such as inferior oiling and safety caused by the decrease in viscosity. Therefore, do not use diluted water-soluble lubricants.

How can I use water-soluble lubricants effectively?

Generally speaking, people use water-soluble lubricants by spraying them inside of sleeves. However, an appropriate spray pressure must be used. If the spray pressure is not appropriate, the lubricant will come out of the mold, which will lead to insufficient oiling and that to insufficient lubrication. Also, effective lubricant application is achieved when the inside of the sleeve is at a temperature of 250°C or lower, so you have to check the cooling system.

Can I use oil-based lubricants and water-soluble lubricants in the same way?

Generally speaking, people use oil-based lubricants by dripping them onto tips and into sleeves.
On the other hand, the goal with water-soluble lubricants is to quickly change their water part into steam and then quickly apply the lubricant to the inside of the sleeves. To this end, it is said that the best method is to spray water-soluble lubricants inside of sleeves.

What merits exist in changing from oil-based lubricants to water-soluble lubricants?

Compared to oil-based lubricants, water-soluble lubricants are less combustible. As a result, there are less components that adhere to the areas around the ejection nozzles, which leads to environmental improvements. Also, water-soluble lubricants contain a smaller amount of active ingredients. This means that you can expect that the amount of gas surrounding the products will be reduced, the colors and shine of the products will be improved, and there will be less defective products caused by blow holes.

What is the difference between oil-based lubricants and water-soluble lubricants?

Oil-based lubricants are made entirely of oil (plus dispersed solid lubricants) while water-soluble lubricants are made of an emulsification of oil (plus dispersed solid lubricants) and water. To put it simply, it is the difference between one substance that does not have water and one substance that does.