How to Avoid Oil Pollution of Injection Molding Products

In the past few days, most of the companies have started. For process commissioning personnel, mold maintenance personnel and product sorting personnel, the product often has oil pollution after the Injection Molding Machine is turned on, which is a headache problem.

Sorting personnel often find the process debugging staff to complain that: pick up several machines, this piece of oil too much, wipe not come over, this place how to wipe the oil can not wipe off.

The craftsmen observed that there was a problem in mold maintenance, the mold was not used for too long, and the oil was decomposed into black water in the gap of the insert and the gap of the thimble hole.

Use alcohol, cleaning agent, release agent for form work, A set of processes down the product oil pollution may be reduced, but can not remove the root cause, if continue to maintain production, the workload of employees increased, when there is leakage will bring quality risks.

1. the cause of oil pollution in the mold

The oil is caused by decomposition or carbonization of the oil, which seeps into the slider gap and thimble gap of the mold. For the injection molding workshop, when the injection molding machine is stopped in order to prevent the mold temperature from being higher than the ambient temperature and form water vapor (anti-moisture), Because the antirust agent has the effect of blocking oxygen and water, forming an oil (wax) film on the metal surface, so spray the antirust agent to prevent the mold from rusting after the unfinished mold is shut down, and the mold that has been produced needs to be removed, washed, and oiled for maintenance.

1, mold under the machine maintenance, should control the use of grease and thimble oil, to avoid due to excessive smear caused by a lot of oil, should be used to evenly smear cotton thimble oil, reasonable control mold maintenance should use the dose.

2. the oil content of the oil antirust agent is too high, the grease, thimble oil and release agent for form work fail to meet the requirements for quality, the service life is short, and it is not easy to decompose and carbonize.

(3) The use of the mold exceeds the life period, or the precision of the mold caused by the problem of mold maintenance is too poor, the lack of lubrication between iron and iron, the thimble wear and slider wear are serious, and the mixture of oil and rust produced.

4, the injection molding process conditions are unreasonable, the temperature of the mold thermostat is set too high, or the mold waterway has a "dead water" situation, the temperature is too high and the lubricating oil in the mold is decomposed and melted.

5, not in accordance with the prescribed boot steps, cleaning the mold with washing sewage with the air gun to use, and use alcohol cotton cloth to clean and wipe the mold surface, in order to prevent when the injection molding production of high-temperature plastics to advance the oil into the mold gap.

6, not in accordance with the mold maintenance requirements and product attribute requirements, the use of matching thimble oil, grease, anti-rust agent maintenance mold.
II, mold oil pollution caused by the solution measures

Oil products can be divided into two types. One is the light oil that can be handled by simple operation, and the other is the heavy oil that is cumbersome to operate and can still be treated.

When there is a heavy oil problem, it is quite difficult to deal with, under normal circumstances, the use of cleaning agents and cotton cloth to scrub the surface or there will be a lot of oil in the product surface. At this time, a variety of means are needed to solve the problem, such as washing the mold of the product, if the gap is too large, it needs to be equipped with the machine, and a series of complex means such as ultrasonic cleaning.

1, when the product requirements for quality are strict, in the mold maintenance, the use of lubricants in the need to match, to avoid a long time did not maintain the mold caused by oil oxidation. Otherwise, the consequences are very serious, because the oil can not be produced on the machine, the need to remove the mold cleaning parts, after cleaning the machine production or oil situation, still need to clean the parts under the machine, time-consuming and laborious to the production of passive.

2, when the product has appeared oil pollution, want to solve is a certain degree of difficulty. However, the problem of oil pollution can be prevented in advance, most of which is due to the use of mold rust inhibitors and thimble lubricants. When the product requirements for quality strict mold, to choose wax rust, spray on the surface of the mold to form a wax mold, will not make the oil into the mold in the gap. Thimble oil can not afford to choose black print of the thimbles lubricant.

3, when the product appears oil pollution, careful analysis of the causes, sometimes it may be the waterway does not circulate or the mold temperature is too high, only need to reduce the mold temperature and dredge the waterway can be solved. But sometimes it is not oil, iron and iron contact with the lack of lubricating oil and friction of iron filings, in time to the machine with wear parts, find the key point to solve the problem.

4, in the working environment, should ensure that the equipment, workbench, the ground is clean and tidy, do a good job of 5S management. Avoid the oil leakage caused by the aging of the equipment, which will pollute the ground and equipment, and indirectly lead to oil pollution products during production.

5, because the plastic is a compound extracted from petroleum, when the injection molding production, the high temperature will decompose trace gases and oil, In mass production, the exhaust groove and parting surface on the mold will be blocked by oil and polymer, so when the injection molding machine is working, the craftsman should regularly wipe the parting surface of the mold to avoid oil and dirt contamination of the product.

To do a good job of regular maintenance of the mold, the mold on the choice of oil is very important. Product requirements are different at the same time to use matching grease, thimble oil and rust inhibitor, According to the product needs are different, there are hundreds of models in the choice, we will have questions about how to choose, but it must not be expensive, according to the processing temperature to choose the applicable lubricating oil.

Especially for the current injection mold are using high temperature thimble white oil, the price is very expensive, when the product requirements are not strict, the use of high-priced lubricating oil is a waste of money, it is necessary to choose to use according to the properties of the product.