Nov 11, 2021
is a short for a parameter that was defined to determine how well and effectively a specific production equipment is used.
OEE means Overall Equipment Effictiveness.
The parameter indicates the maximum possible output in defined production intervals.
This corresponds to the real productivity in percent.
The calculation is made by multiplying the factors availability (A) in percent, the performance (P) in percent, and the quality (Q) of the manufactured parts in percent.
This results in the formula to:
OEE = A * P Q
Example:
Availablility (0,85) x Performance (0,90) x Quality (0,985) = 0,75 OEE by means 75%
A (theoretical value) OEE of 100% means that there is 100% availability of an production equipment in a production.
This means that there are no production failures, a cycle time to speed performance of 100% and also 100% production of good parts.
![Overall Equipment Effectiveness [OEE] in Injection Molding](https://www.plexpert.ca/wp-content/uploads/2021/11/oee_information.png%0A "Overall Equipment Effectiveness [OEE] in Plastic Industry")
Quality Assurance: Formula to calculate the parameter OEE
Related topics:
Efficiency
Productivity
Utilization
This glossary of plastic industry is provided by PLEXPERT Canada Inc.
May 18, 2021
One of the most basic gates for injection molding is the edge gate.
The gate normally has a rectangular cross-section along the parting line of the mold to connect the runner system with the mold cavity.
The lapped edge gate is slided onto the top of the cavity.
It can be easily manufactured by a basic machining process.
The risk of jetting is reduced with this version.
The disadvantage of the edge gate is the remaining of the connection of the molded part to the runner after ejection. Additional mechanical action is needed for separation.
Injection
mold: The
cavity is filled through the
lapped edge gate
Related topics:
Banana Gate
Fan Gate
This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Jul 17, 2019
In injection molding, part inserts are commonly used to produce parts.
First, the part inserts are added into the cavity, after that the melt over molds it on one side.
This is why the process is called “Overmolding”.
The advantage of this process is that the materials are connected due to the hot melt by a strong bond.
Gluing of the different parts is unnecessary in this case.
This process is often used with films as part inserts.
It is important to control the process temperatures since a melting of the insert is not or only partially wanted.
Injection Molding Process: The bicycle helmet is manufactured by
overmolding of the PC-Shell with the EPS core.
Related topics:
Gluing
This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Oct 13, 2020
In injection molding the plastic melt shrinks during cooling down.
Therefore after a volumetric filling of the cavity additional material is pushed into the cavity to compensate the shrinkage.
The phase where the screw still apply pressure to the melt is called packing phase.
Packing pressure (and packing time) is hereby essential.
Too much packing pressure leads to overmolding and flash formation.
Not enough packing pressure results in sink marks, voids and higher shrinkage.
Often a profile is used to apply pressure during the packing phase.
Forward movement of the screw during the
packing phase
Related topics:
This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Nov 29, 2018
To compensate the shrinkage, it is necessary to inject more material after 100% filling of the part.
The length of packing time (green line in the time-pressure diagram below ) must be selected in such a way that the gate freeze time is reached.
A short packing time leads to a higher risk of sink marks and voids.
Similar things will happen, if there is still molten material within the part but the gate is already frozen.
