Tag Archive for: Injection Molding Troubleshooting

Injection molding troubleshooting chart

Injection molding troubleshooting

Injection molding is a common way to make parts out of plastic. It does, however, come with some problems. In the next few paragraphs, we’ll talk about why troubleshooting is important in the injection molding process and give you a complete outline for finding and fixing common issues that come up during the process. If you follow these best practices and troubleshooting tips, you will be able to get the most out of your injection molding operations and make products that are of high quality and don’t have any flaws.

Getting a better sense of how injection molding works Instead of starting to fix problems right away, let’s first learn more about how the injection molding process works. Getting the material ready is one of the many steps in this complicated process. Other steps include melting, injecting, cooling, and ejecting. For example, temperature, pressure, and speed are some of the variables and parameters that can change during each step. All of these can affect the quality of the final product.

Figuring Out Problems with Injection Molding To effectively fix problems with injection molding, it is important to accurately describe the problems that are happening. Inspection by sight and analysis of defects are both very important parts of this process. Photographs often have flaws like short shots, flash, warping, bubbles or voids, sink marks, splay marks, burn marks, and color streaks. If you know what causes each defect, you can take specific steps to fix them.

Techniques and Strategies for Troubleshooting: When you’re trying to figure out what’s wrong with an injection mold, you need to be methodical. Another useful method is called “root cause analysis,” which involves finding the things that are causing the problems below the surface. Sometimes, running tests and changing things about the process, like the speed, pressure, and temperature of the injection, can also help fix problems. When you are trying to figure out what the problem is, you need to think about both the material and the mold.

What are some common ways to fix issues with injection molding? Let us look at some of the most common ways to fix problems with injection molding. Changing the injection’s speed, pressure, and time can often fix problems like short shots and flash. By making the mold and cooling systems work better, you can help keep the material from warping or deforming. To keep the machine running at its best, its parts need to be checked and cleaned on a regular basis. Choosing the right materials, getting molds ready, and keeping them in good shape are also things that can help solve problems.

No doubt about it! Here are some tips on how to fix common problems in the world of injection molding:

  1. Short Shot:
    Check the injection pressure and speed if there is not enough pressure. It may be required to clean or replace the nozzle.
    Reduce heat: Raise the temperature of the mold and plastic.
    Feeding problems: Verify the feeding system and make sure the material is being supplied smoothly.
    Troubleshooting mold: Look for signs of damage or obstruction.Injection molding troubleshooting chart
  2. Flash:
    Excessive pressure: The injection pressure should be decreased because it is excessive.

    High speed: It is recommended that the injection speed be slowed down.

    Mold issues: Problems with mold: Examine the mold for any signs of wear or damage.

    Nozzle wear: Wear and tear on the nozzles: inspect and replace any that are worn out

  3. Warping or Deformation:
    Uneven cooling: Cooling unevenly? Try experimenting with different times and materials.

    Unstable mold temperature: Mold heating and cooling systems should be checked if the temperature is unstable.

    Uneven pressure: Imbalanced pressure: Modify the injection speed and pressure.

    Plastic quality issues: Check the supplier’s material quality to avoid plastic quality issues.

  4. Bubbles or Voids:
    • High temperature: Lower the plastic and mold temperature.
    • Excessive pressure: Reduce the injection pressure.
    • High moisture content: Ensure low moisture content in the material.
    • Poor mold design: Check for adequate venting and vent channels in the mold.
  5. Adhesion or Difficult Release:
    • Low temperature: Increase the plastic and mold temperature.
    • Insufficient mold lubrication: Ensure proper use of mold release agents.
    • High plastic viscosity: Adjust the melt temperature and speed.
    • Rough mold surface: Perform mold maintenance and repair.
    • Insufficient cooling time: Increase the cooling time.
  6. Sink Marks:
    • High material viscosity: Lower the melt temperature and speed.
    • Insufficient packing pressure: Increase the packing pressure and time.
    • Inadequate cooling time: Extend the cooling time.
  7. Splay Marks:
    • Moisture in the material: Dry the material thoroughly before processing.
    • Contaminated material: Use clean and high-quality materials.
    • High melt temperature: Lower the melt temperature.
    • Excessive shear heating: Reduce the injection speed.

Keep in mind that finding and fixing problems with injection molding takes a lot of time, effort, and changes to a lot of different settings. It is important to follow the instructions that came with your equipment and get help from a professional when you need it.

Below is Injection molding troubleshooting chart

Symptom Possible Causes Solutions
Short Shot Insufficient pressure – Check injection pressure and speed<br>- Clean or replace nozzle
Low temperature – Increase plastic and mold temperature
Feeding issues – Ensure smooth material supply<br>- Check feeding system
Mold issues – Check for damage or blockage in the mold
Flash Excessive pressure – Reduce injection pressure
High speed – Slow down injection speed
Mold issues – Check for wear or damage in the mold
Nozzle wear – Check and replace worn-out nozzle
Warping or Deformation Uneven cooling – Adjust cooling time and medium
Unstable mold temperature – Check operation of mold heating and cooling systems
Uneven pressure – Adjust injection pressure and speed
Plastic quality issues – Check material quality provided by the supplier
Bubbles or Voids High temperature – Lower plastic and mold temperature
Excessive pressure – Reduce injection pressure
High moisture content – Ensure low moisture content in the material
Poor mold design – Check for adequate venting and vent channels in the mold
Adhesion or Difficult Release Low temperature – Increase plastic and mold temperature
Insufficient mold lubrication – Ensure proper use of mold release agent
High plastic viscosity – Adjust melt temperature and speed
Rough mold surface – Perform mold maintenance and repair
Insufficient cooling time – Increase cooling time
Injection Molding Troubleshooting

Injection Molding Troubleshooting: Unraveling the Secrets to High-Quality Production

Injection molding troubleshooting is a very important step to take if you want to make sure that the plastic parts you make are of high quality. The main goal of this comprehensive procedure is to find and fix any issues that may arise during the process of injection molding, which is a commonly used manufacturing method. As long as manufacturers are ready to learn how to solve problems, they will be able to avoid common problems and make products that work perfectly. This article will talk about why it’s important to be proactive when solving problems, as well as the step-by-step process of fixing problems with injection molding, common problems, and ways to avoid them.

Making Injection Molds Checking for problems and getting ready for injection molding

Before you start troubleshooting, you need to have a good understanding of how the injection molding process works. Learning about the different parts of the machine and the features of the molds that are used is important. Also, make sure that the right paperwork and records are kept so that troubleshooting is easier.

How to Fix Problems with Injection Molding Methods

First, figuring out what the problem is

If you’re having trouble with injection molding, the first thing you need to do is figure out what the problem is. It is recommended that the parts that have been manufactured be looked at carefully to find any flaws or other problems. At the same time, you should ask operators and technicians about any concerns or observations they may have. For everyone to fully understand the problem at hand, this way of working together is necessary.

The second step is to look at the possible causes.

Once the problem has been found, it is important to look into what might have caused it. Defects in injection molding can be caused by a number of different things. Things that have to do with the material need to be carefully looked at, like the type of resin used, the amount of moisture present, and the best way to handle and store it. It’s also important to look into things that have to do with the machine, like the temperature, speed, injection pressure, and wear that the machine causes. If you want to avoid mold, you should pay close attention to things like design, how well the cooling system works, and venting.Injection Molding Troubleshooting

Step 3: Testing and confirming hypotheses

To make sure that possible causes are real, it is imperative to conduct organized tests. You can change things about the process, like the temperature, pressure, and time, and you can also do smaller-scale tests. By looking at the sample parts, you can see if there have been any changes or improvements. It is possible to make choices based on data, and this experimental method helps to narrow down the different problems that need to be fixed.

The fourth step is to put corrective actions into action.

Now that we have very useful information from the testing phase, it is time to take corrective actions. Changes to the process settings, molds that have been fixed or changed, and changes to the material specifications are all common ways to fix problems. Being aware of how these actions might affect the whole manufacturing process makes them very important that they are done very precisely.

The fifth step is to keep track of the results and evaluate them.

After corrective actions have been taken, it is important to keep an eye on the results and think about what went wrong. There should be follow-up inspections to make sure that the changes that were made are getting better. The operators and technicians should be given helpful feedback, and the changes and improvements that have been made should be recorded. In this step, a feedback loop is set up. This loop allows for continuous improvement and helps keep problems like this from happening again.

Common problems with injection molding and ways to fix them

Flaws on the outside Discolorations on the surface like sink marks, warpage, and flow lines are common during the injection molding process. Sink marks can happen when there isn’t enough material packing, while warpage can happen when the material cools unevenly. Flow lines, on the other hand, are caused by mold filling or bad flow.

Some of the most common changes in size that happen during injection molding are shrinkage, overpacking, and part distortion. There is a process called “shrinking” that happens when plastic is put in the fridge. Overpacking is what happens when too much pressure is put on something, and it leads to errors in the dimensions. A part can become distorted if it cools unevenly or if the mold wasn’t made correctly.

Issues that come up with injections: Problems with injections that happen a lot include jetting, flashing, and short shots. In the event that the molten plastic does not completely fill the mold, short shots may happen. Flash is the extra material that gets out between the mold parts. Jetting, on the other hand, creates turbulent flow that leads to flaws in the final product’s appearance.

Case Study: Warpage Problems and How to Fix Them

Honest Technology A mold maker in China that specialized in injection molding for auto parts had problems with warpage on a regular basis in their production line. Even with all of their best efforts, the finished parts always had unacceptable levels of distortion throughout the whole process. Let’s look at the steps they took to figure out what was wrong and fix it.

First, figuring out what the problem is

Following a thorough visual examination of all the parts, the manufacturer found that some parts of the product or component were significantly warped. They also asked their operators and technicians what they thought, and they confirmed that the warpage problem affected the whole organization.

The second step is to look at the possible causes.

The manufacturer looked into all the possible reasons for the warping, taking into account things that had to do with the material, the machine, and the mold. It was decided by the researchers that the cooling system inside the mold might not have been designed well enough, which would cause uneven cooling and, as a result, warping.

Step 3: Testing and confirming hypotheses

The manufacturer decided to change the way the cooling system inside the mold was designed so that they could test their theory. The necessary changes were made by them and the person who made their mold working together. A number of small tests were done on the molds that had been changed to see what effect they had on warpage.

The fourth step is to put corrective actions into action.

Molds that had been changed and installed with a better cooling system were used on the production line. The manufacturer also changed the process settings to make sure the best cooling and lower the risk of warping. Their careful observation of the injection molding process was how they made sure the changes were made quickly and correctly.

The fifth step is to keep track of the results and evaluate them.

Once the manufacturer was done making the necessary changes, they started keeping a close eye on the production line. They also did regular checks and looked over the finished parts for signs of warpage. Because the molds and the process were changed, there was a lot less warping, which made the quality of the product much better.

How to prevent problems and the best ways to do things

If manufacturers want to avoid warping and other problems with injection molding, here are some of the best practices they should use:

Setting up an all-around maintenance plan is important. Preventing wear and tear on machines and molds through regular maintenance helps make sure they keep working well.

Regularly checking things out and cleaning them up: It’s helpful to find potential problems with routine inspections, before they get worse. Mold-related contamination can be avoided, and quality can be raised overall, if you clean properly.

Training and education are given to operators and technicians: If your employees have had enough training, they know all the complicated steps that go into the injection molding process and can fix problems as they come up.

Setting up ways to check the quality of the work: Quality control checks can be added at every step of the production process to make sure that only parts that are free of flaws are sent to customers.

Working together with mold makers and material suppliers: Keeping the lines of communication open with both suppliers and mold makers is helpful for choosing the right materials, making the mold design work better, and solving problems quickly.

Sincere Tech is committed to staying at the top of the plastic mold business by embracing new technologies and predicting what the future will hold. We are constantly looking for new materials and composites that perform better and last longer. We give our customers cutting-edge solutions that meet their changing needs by putting money into research and development all the time. We’re proud to be one of the best injection mold suppliers in China because we always try to do our best.

In line with our commitment to sustainability, we put an emphasis on actions that are good for the environment. To keep the damage our manufacturing processes do to the environment to a minimum, we actively look for environmentally friendly alternatives, like biodegradable polymers, and run recycling programs. If you use our services for collapsible core molds, you can connect your brand with eco-friendly manufacturing methods and help make the future greener.

We put a lot of emphasis on quality, and we use strict quality control measures throughout the whole manufacturing process. Our skilled technicians and state-of-the-art facilities make sure that every product goes through thorough testing and inspection, which guarantees top performance, dependability, and customer satisfaction.

You can expect the highest level of professionalism, skill, and new ideas when you choose Sincere Tech as your preferred China mold maker. We want to help you make your ideas come to life by giving you high-quality products that work well, last a long time, and don’t cost a lot.

Our new abilities include the following:

  • Rapid Prototyping: We offer rapid prototyping services to quickly turn your ideas into real prototypes. This lets you make design changes and speed up the product development process.
  • Precision Tooling: We can make high-quality molds with tight tolerances because we have advanced tooling capabilities. This makes sure that your injection-molded products are consistent and accurate.
  • Overmolding: We are experts at overmolding, which lets you combine different materials or parts to make something that works better, looks better, and lasts longer.
  • Insert Molding: Because we are experts at insert molding, we can safely place inserts inside the molded parts, which makes assembly easier and improves product performance.
  • Two-Shot Molding: Two-shot molding lets us make complicated parts out of more than one material in a single step, which cuts down on the need for assembly and opens up more design options.
  • Value-Added Services: We do more than just injection molding. We also offer a variety of value-added services, such as product assembly, packaging, and logistics support, which can save you money and time by streamlining your supply chain.

If you need a collapsible core mold, work with Sincere Tech Mould suppliers. We can help you with a wide range of things, are dedicated to quality and sustainability, and want to go above and beyond your expectations at every step of the way. Let’s make your new ideas come to life together.


Fixing issues that come up during the injection molding process is an important step that makes sure high-quality plastic parts are made. Because they follow a methodical approach, manufacturers can spot, look into, and fix the common issues that come up during the injection molding process. By using best practices and preventative measures, like regular maintenance and inspections and ongoing training, manufacturers can make sure that the quality of their products is always the same and that fewer problems happen with them.

In the injection molding industry, the case study showed how important it is to be proactive about solving problems by showing how warping problems were fixed by troubleshooting these issues. By being proactive, manufacturers can improve their production methods and give customers great products that meet their needs.