Course: Injection molding defects – Streaks

135.60 $ incl. tax


If a surface of a plastic part can be seen by the user, it shall certainly follow some aesthetic rules.

To ensure a good quality of the part surface it is important to know what can happen during production.

One problem that might occur is called streaks and can be visible in smaller or larger areas on a part.
This course goes into details about the causes of streaks and discusses what could be done to eliminate the problem.

SKU: EL11838 Category:

You will learn

  • To identify streaks
  • Understand why they occur
  • More about melt behavior in the mold

This enables you to

  • Select the right set of strategies
  • Implement solutions
  • Prevent the occurrence of the defect


About the course: Injection molding defects - Streaks

It is likely that a quality manager will reject parts with streaks on their surface.

Therefore, it is important to identify the type of a defect correctly and as soon as possible.
After this, it is necessary to have the understanding of the root cause that leads to the problem.
Only then, the right actions can be taken to solve the problem.

Details of why streaks can occur will be discussed here in this course.
With the knowledge provided in this e-Learning course, a good part quality can be reached in production.


This course is for

Everyone who is curious about the topic.
This includes especially people working as:

  • Mold maker
  • Setter
  • Injection molder
  • Quality manager
  • Department leader
  • Project manager


Course details

For basic skill level

Around 40 min in duration

Video On-Demand lessons (1)

Spoken script

Expertise knowledge described step-by-step in text

Additional explanations on important technical terms

Full access on computer or mobile for one year

Certificate of completion when you finish the course

(1) Video streaming is part of the e-learning and shall be accessible in your browser.

Course Specialist

Prof. Dipl.-Ing. Peter Wippenbeck



For many years, Prof. Dipl.-Ing. Peter Wippenbeck has been connected to injection molding technology. He started with mechanical engineering and application technology. Even then, the aim was to achieve a perfect product with the best possible economic efficiency. Quite a few customers confronted him with problem cases and asked for solutions and optimized settings in production.


He took on teaching duties at Aalen University, in Germany, in the field of plastic technology in the 70’s to examine the experiences from industry and to pass on his knowledge to future generations of engineers. Soon, he got a managing position there. His work, with international cooperation, led to the establishment of the master’s degree program in Polymer Technology.


Initiated by the professional association of GKV (called TecPart), industrial training in the field of injection molding was intensified additionally to the engineering degree: Several thousand participants at seminars have already been trained by him and qualified in Aalen including a considerable number of foreign employees and trainers, especially from Thailand, India and Indonesia.


In organizational terms, these activities are located at the Steinbeis Innovationszentrum Kunststofftechnik (SIZK, a non-profit company of Steinbeis Innovation gGmbH), while problem-solving is the responsibility of the Steinbeis Transfer Zentrum Aalen Kunststofftechnik (STAK). In both institutes, the author has been engaged in knowledge transfer in the sense of quality improvement and efficiency in injection molding technology.