Mold Cleaning and Shutdown: First Step to Effective Start Ups
One of the first steps to successful startup is the cleaning and shutdown procedure.
Tooling requires standardized cleaning and preventative maintenance. Cleaning is highly
dependent upon the type of material you are using. For instance, ABS and Nylon blends have
a tendency to gas up quickly, Where Polypropylene and Polyethylene usually produce less
gas and require less maintenance. It is important to note here that as a general rule,every mold
you are responsible should be visually checked a couple of times per shift for good operational
condition. Unusual noise, abnormal flash or other defects can be warning signs that your mold
needs attention.
It is important to recognize the material characteristics of each material you work with,
and respond accordingly. Cleaning itself is standard, and response requires a standardized
approach, from both a lubricating and cleaning perspective:
When cleaning, use an approved mold cleaner. Avoid using rags and mold cleaner on polished
surfaces, instead using a tissue and a mild polish. Do not apply mold cleaner directly to
the surface being cleaned... it is better practice to apply to the cleaning rag or tissue. The purpose
of mold cleaner is to break down surface grime, oil or build up. By spraying directly on tooling,
you can cause moving parts to lose lubrication (a primary cause for galling), or create a scrap
condition due to "bleeding" lubricants.
Pay close attention to vented areas. If a vent exists, it is important to recognize that
vents are installed to allow gas to escape from the cavity. Clean vents liberally and inspect
them for wear/ damage. If damage or wear exists, notify tooling personnel of the issue.
While cleaning, inspect tool for damage and wear-causing conditions (in ex: lack of
lubrication, galling, broken components, etc.). Check clamp set-up for potential errors
that could cause future problems as the mold is running.
At press shutdown, spray the mold liberally with a rust preventative. Again, inspect for
damage or potential failures. NEVER put a clamp under high pressure at shutdown, unless you
are in the process of changing the mold. Instead, touch the mold halves together to help
protect the mold from moisture, and shut down all water sources to and from the mold.
In the case of a hot runner mold, it is important to remember to turn of the hot runner to prevent
material degradation in the mold. Your company may require purging through the hot runner prior
to shut down. It is also good practice to shut the hot runner temps off as the press cycles. When the
you beginning running shorts, the press can be removed from cycle. This helps to reduce the amount
of time that material sits idle in the hot runner and helps to reduce degradation.
Suggested Tooling Reference Guides:
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