The causes include problems with flow lines sink marks vacuum voids and surface delamination.
Rubber injection molding defects.
The combination of material.
A slow injection speed or low pressure injection molding can also cause flow lines as the plastic cools very quickly and becomes thicker forming molding defects like wavy patterns or streaks.
Evaluating the root causes of rubber molding defects through virtual molding by matt proske and harshal bhogesra sigma plastic services injection and transfer molding of elastomers is a complex operation.
Making injection molded prototypes is both an art and a science.
Top 10 injection molding defects and how to fix them tony rogers on june 12 2015 tweet.
Material is also limited to high flowing compounds when it comes to rubber injection molding.
Especially in the latter case these defects can be difficult or costly to address in future production.
It may not seem very complicated but when you look into the details it really is.
Injection molding is a manufacturing process for producing parts by injecting molten material into a mould or mold injection moulding can be performed with a host of materials mainly including metals for which the process is called die casting glasses elastomers confections and most commonly thermoplastic and thermosetting polymers.
Defects can be introduced into molded products by issues with the mold tooling itself.
Please always follow the material manufacturer and machine manufacturer s guidelines for safety.
The simplest answer to this problem would be to increase the injection speed of the injection molding cycle.
High levels of technical expertise and attention to detail are required to prevent small mistakes from costing companies big money when it comes to mass production of novel parts.
Here s what to look out for.
The process of rubber molding entails the appropriate rubber material getting placed inside of a mold and is compressed between two plates.
How to rectify it.
Common issues with rubber injection molding since rubber injection molding is a complex technology the process can present production problems caused by defects in the molds or part processing.
The solutions mentioned are possible solutions and must be tried out with safety in mind.
Injection molding defects caused by poor mold design or maintenance.
Molding defects reduce the surface quality of rubber and plastic parts.
That way you have assurance that the molding process gets done by an expert so that you ultimately end up with a precision product as opposed to one with defects.
