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Injection Molding Machine
In order to form a molded article by
actually carrying out injection molding using a plastic injection molding
machine, it is necessary to carry it out in a condition in which the mold and
the molded material are made to match with the specifications of the molded
article. If merely a molten plastic is injected into the mold, solidified, and
taken out of the mold, there will be large variations in the molded article
dimensions, fluctuations in glossiness, and generation of external appearance
transfer striations, and it is not possible to obtain products with a uniform
quality.
In order to obtain injection molded
articles with the desired quality, it is necessary to adjust various parameters
called the "molding conditions" of the injection molding machine by
carrying out the work of adjusting the conditions so that the specifications
are satisfied while controlling the dimensions, external appearance, and
quality of the molded article.
In other words, the quality of the
produced injection molded article depend on whether the adjustment of the
molding conditions is good or bad. If the range of this parameter adjustment of
this adjustment of molding conditions is wide, the range of changing the
quality specifications becomes wide, and making the adjustments becomes easy.
When the usual comment that "the mold has been prepared well" is
made, very often the width of such condition adjustment is wide. To put it in
another way, during the design of the mold, it is necessary to give
considerations so that it is possible to set wide the range of adjustment of
the molding conditions. For example, the design is made so that sufficient flow
rate of the cooling circuit is acquired, providing gas vents appropriately
thereby making it difficult for burns to occur even when high speed filling is
made, etc.
Mold temperature
The mold temperature is a very
important parameter that affects the shrinkage of the molded article and the
transfer of the cavity surface. It is very common to use a water cooled type
temperature controller when the mold temperature is in the range of 15 to 90°C.
When the mold temperature exceeds 90°C, either a pressurized water type or an
oil type temperature controller is used, or the temperature control is made
using a cartridge heater.
Although what is being controlled is
the mold temperature, what is really important is the cavity surface
temperature. In order to control this accurately, the common method is to
adjust the mold temperature based on the actual value measured using a contact
type surface temperature measuring instrument.
As for the method of incorporating a
non-contacting type infrared temperature sensor inside the cavity, although it
is very effective because it is possible to measure accurately the mold
temperature in real time, it requires equipment and know how.
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