Top 10 Plastic Injection Molding Questions

Plastic injection molding is the most popular process for manufacturing plastic parts. This process involves molten material which is injected into a mold to create a product. Our in-house molders provide both the design and manufacturing of these products. 

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1. What determines the cost of plastic molding?
   The cost of injection molding is determined by a number of factors such as; the number of cavities, the mold itself, complexity of parts, etc. The actual mold itself is usually the most expensive upfront cost. Additionally, the fewer number of cavities will lower your upfront cost and vice versa. We&#;re dedicated to providing customers with quality service at a lower cost
2. What sized businesses do you serve?
   When researching molding manufacturing companies it&#;s important to keep in mind your volume requirements and make sure they match that of the company you work with. The Toolroom is equipped to handle volume from small to large businesses. No matter the size of your project, we can help
3. What certifications should I look for when choosing a molder?
   Certifications are a great way to determine which molder is right for you. They show which businesses are at the top of the industry. At the Toolroom we are dedicated to providing the best services to our customers and this includes having the proper qualifications. When choosing a manufacturer, it&#;s important to research their current certifications to ensure you are getting quality manufacturing.
4. Should I buy my parts in the US or overseas?
   While working with a manufacturer overseas or even moving your business overseas will help save on up-front costs, working with a local manufacturer has numerous benefits. Choosing a local manufacturer is a great way to ensure open lines of communication during the course of your project. Choosing a manufacturer in the United States and more importantly, a local manufacturer has great long term effects in terms of cost and project turn-around time.
5. How long does it take to build a mold?
   Creating a plastic injection mold can take anywhere from 5-12 weeks. The complexity of each project will determine the turn-around time.
6. Can I get a mold warranty?
   Many mold manufacturers offer limited Lifetime Warranty for their molds. This ensures that if your project should need fixing, it can be done at no charge.
7. What type of material or resin is needed?
   Picking the right materials for your project, can a stressful task as there are hundreds of different products to choose from. Below are the 5 most common resins that can be used for injection molding:
   • ABS
   • Celcon
   • Polypropylene
   • HIPS
   • LDPE
8. What types of custom-built plastic injection molds are out there?
   There are several different plastic injection moldings available in the marketplace to fit your needs. The Toolroom has several custom-built moldings to choose from:
   • Unscrewing Molds
   • Two Shot Molds
   • Prototype Molds
   • Multi-Cavity Molds
   • Insert Molds
   • Stack Molds
9. What does the molding process look like?
   Here at The Toolroom we have a creative system in place to help guide you through every step of the injection molding process.
   • Send us the 3D CAD model along with all the mold requirements for your product
   • We will provide you with a quote
   • You will receive one-two reviews of your project design
   • Once we have your approval, the manufacturing process will start
   • After the molding process is complete, we will test run your product
10. What do I do if I already have an injection mold?
    If you already have an injection mold made, you will need to find a company that is also able to produce plastic parts. Luckily, The Toolroom is equipped with experts to help you develop any plastic product you made need.

A mold repair technician&#;s job has always been to make molds run&#;anyhow, any way. Intangibles such as technique, methodology, maintenance efficiency, accountability, and continuous improvement have never been much of a factor in assessing the performance of a custom repair facility, a proprietary mold repair shop, or an individual&#;s skill level. Performance was based on missed production schedules&#;period. Today, however, any company seeking to sharpen its competitive edge realizes that keeping molds production-ready and reliable is much more dependent upon proactive maintenance measures than reactive habits.

To implement an accurate, efficient repair and to optimize downtime hours, repair technicians must have access to data that lets them quickly evaluate the mechanical and performance characteristics of any mold on which they work. Repair technicians should not be expected to recall from memory data relating to specific issues of maintaining and troubleshooting a stable of expensive molds. To do the job effectively, they need to know not only the smallest details such as minuscule tolerances and stack dimensions, but also the predominant long-term issues molds suffer as a result of design or construction features that cause problems during production or maintenance.

In today&#;s economy, it is becoming more common for the customer to be asking these questions of their mold vendors, because they want to know exactly what is going on with their half-million-dollar mold and how their repair dollars are being spent.

Still, many shop supervisors feel that if nothing is broken right now&#;then all is well. But to make continuous improvements in mold maintenance and repair, the supervisor must be able to measure performance, and then set targets and goals for molds and personnel.

I am often asked what are the most important areas of mold performance and the maintenance criteria to be used by repair technicians, managers, supervisors, and customers. Here are 10 questions that will demonstrate the current level of data utilization in your company, in terms of data that is readily available for a repair technician, supervisor, manager, or engineer to use on a daily basis. The answers to the first three questions are critical for any hope of improvement and are needed to determine targets and set goals. If you can&#;t answer the first three, you needn&#;t continue on, because the following questions just drill deeper into your mold knowledge database.

1. What is your #1 reason for unscheduled mold downtime and what is the cost?

a. What is the total count and type of the most common unscheduled mold-stop reason?
b. What is the mold distribution for the #1 unscheduled mold stop reason? (Is it related to a particular mold style, product, or press?)
c. What is the time and personnel correlation with the #1 unscheduled mold stop reason?
d. What are the related corrective actions and costs (of tooling and labor) for resolving the #1 unscheduled mold-stop reason?

2. What is your #1 mold or part defect or quality issue?

a. What is the total count and type of that defect?
b. What is the mold distribution of the defect? (Mold style, product, or press related?)
c. What is the cavity I.D. or mold position of the defect? (Is it position related?)
d. What are the related corrective actions and costs (tooling and labor) for resolving the defect?

3. Which is your mold with the highest maintenance costs (per hour or cycles of run time)?

a. What is the mold description, style, and product?
b. What are the types of defects and frequencies for that mold?
c. What type of tooling is used by that mold?
d. What type of corrective actions are required for that mold (cleaning, replacement, reworking, restacking, shimming, etc.)?
e. What are the related corrective actions and costs (tooling and labor) for that mold?

Answers to the next three questions provide data for supervisors to better schedule mold repairs and match repair skills to job complexity&#;i.e., optimize downtime hours.

4. What are the average repair hours for each mold during the following:

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a. Wipe-down level cleaning (level 1)?
b. General level cleaning (level II)?
c. Major level cleaning (level III)?

5. What is the workload of each of your mold technicians?

a. How many molds does each repair?
b. What types of molds does each repair&#;i.e., mold styles, products (a measure of repair skill)?
c. What is each technician&#;s mold-repair efficiency? Do their molds always start up with 100% efficiency and no quality or production issues?
d. What are the average corrective action costs (labor and tooling) for each technician?

6. What is the total workload and mold-repair pace of your shop?

a. What is the total count of molds repaired?
b. What types of molds are repaired (mold styles, products)?
c. What are the average labor hours per repair?
The next four questions provide supervisors and technicians the necessary data to look farther down the road to recognize and monitor trends and patterns so as to budget more wisely.

7. What are your top 10 molds with the most unscheduled downtime events?

a. What are the types and frequencies of unscheduled mold-stop reasons?
b. What is the mold distribution for the unscheduled mold-stop reasons (mold style, product, or press related)?
c. What is the time and personnel correlation with the unscheduled mold-stop reasons?
d. What are the related corrective actions and costs (tooling and labor) for resolving the unscheduled mold-stop reasons?

8. What are your top 10 mold or part defects overall?

a. What are the defect types and frequencies?
b. What is the distribution of the defects (mold style, product, or press related)?
c. What is the cavity I.D. or mold position of defects (position related)?
d. What are the related corrective actions and costs (tooling and labor) for resolving the defects?

9. What are your top 10 molds with the highest overall defect count?

a. What are the defect types and frequencies?
b. What is the mold distribution of the defects (mold style, product, or press related)?
c. What is the cavity I.D. or mold position of defects (position related)?
d. What are the related corrective actions and costs (tooling and labor) for resolving the defects?

10. What are the top 10 molds with the highest maintenance costs (per hour or cycles of run time)?

a. What are the mold descriptions, styles, and products?
b. What are the defect types and frequencies?
c. What types of tooling are used by these molds?
d. What types of corrective actions are required (cleaning, replacement, reworking, restacking, shimming, etc.)?
e. What are the related corrective actions and costs (tooling and labor)?

About the Author

Steven Johnson is the maintenance systems manager for Progressive Components and has his own business, MoldTrax, in Ashland, Ohio. He can be reached at or (419) 289-.

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