Apr 19, 2019
In the injection molding, the melt is injected inside the cavity through a gate.
Therefore, the gate position has an essential influence on the quality of the part.
The route of weld lines, the existence of air traps and the fiber orientation depends on the gate position.
Different flow length affects the pressure that is needed to fill the cavity.
The wall thickness at gate position leads to a longer or shorter packing time.
Moreover, the gate position might change the warpage of a part considerably.
Injection
mold: Filling pattern on the same
part with two different gate locations.
Related topics:
This glossary of plastic industry is provided by PLEXPERT Canada Inc.
May 6, 2021
For the production of injection molded parts a mold is necessary to be placed on the injection molding machine.
It is commonly build out of steel or aluminum and is designed as a permanent form.
Depending on the plastic material used millions of parts can be created with one mold.
The complexity of a mold range from a simple two-plate molds up to a complex stack mold with sliders, etc.
To avoid additional costs it is important to think about the mold concept early in the concept phase of part design.
Injection
mold: 15 year old and more than 750000
parts produced.
Related topics:
This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Aug 20, 2019
If several parts are produced in one cycle (one shot), the mold is called a multi-cavity mold.
For the production of e.g. four identical parts, the short term is a 4 cavity mold.
If mirrored parts are produced in one mold, for example, two left and two right side parts, the common name for the mold is 2+2 cavity mold.
In the case of different parts produced in one mold, the technical term is family mold.
(4 different cavities = 4 cavity family mold).
In multi-cavity molds, the balancing of the runner is vital to get a homogeneous filling of the parts.
This is important to avoid overpacking of single cavities and this ensures the same quality of all parts that will be produced.
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.
Feb 8, 2019
Due to the high weight, when it comes to transport and mount, threads are attached on an injection mold in which ring bolts are screwed.
Using the ring bolts, the mold can be easily hung into the indoor crane and mounted on the machine. The threads of the bolts are always designed according to the weight of the mold. Ideally, the location of the ring bolt is at the mold’s center of gravity, that it does not tilt during transportation and installation.
Mold:
Ring bolts in different sizes
Related topics:
Setting up
Round Sling
This glossary of plastic industry is provided by PLEXPERT Canada Inc.
