Company news

CONTACT WAY

TEL：+86-0769-85397751
E-MAIL：sales@mdmmetal.com
ADD：A1-2, Liansheng Industrial Park, NO.60, Dezheng Middle road,Changan Town, Dongguan City, Guangdong, China.

Related Products

Custom MIM Parts

Lock plug-custom made MIM parts can be used in door lock, padlock, coded lock etc. China Metal Injection Molding Parts Custom Lock Metal part for Lock knob-precision mim parts

Powder metal parts

Powder metallurgy Car intake system gear MIM parts Material: Iron-base alloy; China custom Powder metallurgy Parts

Location：HOME > News > Company news > Company news

Injection molding process personnel must know 18 basic knowledge (13-18)

Writer： MDM METAL Source：未知 Date：2022-08-08

13）Calculate retention time and importance
As a general practice, the residence time of a plastic on a particular injection molding machine should be
calculated. Especially when large injection molding machines use less injection volume, the plastic is easy to
decompose, and this is not detectable from observation. If the retention time is short, the plastic will not be
uniformly plasticized; The properties of the plastic will decay as the retention time increases.
So be sure to keep the detention time consistent. Methods: Ensure that the plastic input into the injection
molding machine has stable composition, consistent size and shape. Report to the maintenance department any
malfunction or wear on the injection molding machine.
14）Temperature environment of ejector cylinder
It should be noted that the glue temperature is very important, and any injection cylinder temperature used is
only indicative. If you have no experience working with a particular plastic, start with the lowest setting. Usually
the first zone temperature is set to the lowest value to prevent premature melting and adhesion of the plastic in
the feed mouth.
The temperature in the other areas then increases gradually until it reaches the nozzle, and the temperature at
the tip of the nozzle is usually slightly lower to prevent dripping. Molds ARE ALSO HEATED AND COOLED. Molds
ARE ALSO SEPARATED DUE TO THE size OF MANY MOLDS, BUT THE ZONES SHOULD BE SET TO THE SAME
SIZE unless otherwise INDICATED
15）Melting temperature
The nozzle can be measured or measured by air injection. When making measurements with the latter, care
must be taken to ensure that there are no accidents when cleaning the hot melt plastic, which can burn and
even corrode the skin due to its high temperature. In the injection molding factory, burns are accidents.
Therefore, gloves and a face mask should be worn when handling hot plastic or when there is a risk of
splashing hot melted plastic. To ensure safety, the tip of the heat control needle should be preheated to the
temperature to be measured. Each type of plastic has a specific melting temperature. To reach this
temperature, the actual injection cylinder adjustment depends on the rotary speed, back pressure, injection
volume and injection cycle.
16）Mold temperature
Always check that the injection molding machine is set and running at the temperature specified on the record
sheet. This is very important. Because the temperature will affect the surface finish and output of injection
parts. All measured values must be recorded and checked on the injection molding machine at the specified
time.
17）Uniform cooling
Injection MOLDED PARTS MUST BE EVENLY COOLED, THAT IS, DIFFERENT PARTS OF THE MOLD MUST BE
COOLED AT different rates, so that the whole product will be evenly cooled. Injection molded parts must be
cooled as fast as POSSIBLE without defects such as uneven surfaces or changes in physical PROPERTIES.
Injection parts of the cooling rate must be equal, but means to cool the mold in an uneven way, such as cold
water input into the mold core part, while the outside of the mold is cooled with warmer water. This technique
should be used for the flat product with precise plastic tolerance of syringe or the large product with long flow
of watering spout.
18）Check temperature and cooling
Always check that the injection molding machine is set and running at the temperature specified on the record
sheet. This is very important. Because the temperature will affect the surface finish and output of injection
parts. All measured values must be recorded and checked on the injection molding machine at the specified
time.

Last：Injection molding process personnel must know 18 basic knowledge (7-12)
Next：Null

Custom MIM Parts

Powder metal parts

Injection molding process personnel must know 18 basic knowledge (13-18)

Other Links - Want to Learn More?