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Plastic Injection Molding Jobs in Missouri (NOW HIRING)

LFP Associates

Operations Manager

Kansas City, MO · On-site

$130K - $145K/yr

The Operation Manager is responsible for leading all day-to-day manufacturing operations with an plastic injection molding facility, ensuring safety, quality, delivery, and cost objectives are met.

Advastar, Inc

Molding Technician

Kansas City, MO

$27 - $35/hr

Injection molding, molding technician, mold changeover, mold setup, mold technician, plastic molding, injection mold, auxiliary equipment, overhead crane, valve gate, hot runner, cooling system ...

Advastar, Inc

Molding Technician

Kansas City, MO

$27 - $35/hr

Injection molding, molding technician, mold changeover, mold setup, mold technician, plastic molding, injection mold, auxiliary equipment, overhead crane, valve gate, hot runner, cooling system ...

Alpla

Injection Molding Process Technician

Kansas City, MO · On-site

$24.50 - $29.25/hr

Setups, adjusts and optimizes injection molding process * Assists engineering with production tool qualification procedures as needed. * Assists packaging manager and project employees * Documents ...

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All JobsPlastic Injection Molding JobsPlastic Injection Molding Jobs in Missouri

Plastic Injection Molding information

See Missouri salary details

$11

$17

$23

How much do plastic injection molding jobs pay per hour?

As of Jul 27, 2026, the average hourly pay for plastic injection molding in Missouri is $17.22, according to ZipRecruiter salary data. Most workers in this role earn between $14.42 and $19.38 per hour, depending on experience, location, and employer.

What is the hourly rate for injection molding?

The hourly rate for plastic injection molding operators typically ranges from $15 to $25 per hour, depending on experience, location, and the complexity of the equipment. Skilled workers with certifications or specialized knowledge may earn higher wages, and rates can vary based on the manufacturing environment and company size.

What is plastic injection molding?

Plastic injection molding is a manufacturing process used to produce parts by injecting molten plastic material into a mold. The process involves melting plastic pellets, injecting the liquid into a custom-designed mold cavity, and then cooling the material until it solidifies into the final shape. This method is widely used due to its ability to produce high volumes of identical parts with complex shapes and fine details. It's commonly used in industries such as automotive, consumer goods, electronics, and medical devices.

What are some common challenges faced by Plastic Injection Molding Technicians, and how can they be addressed?

Plastic Injection Molding Technicians often encounter challenges such as machine downtime, material inconsistencies, and maintaining product quality. Addressing these requires strong troubleshooting skills, attention to detail, and good communication with maintenance and quality control teams. Proactively inspecting equipment, adhering to preventive maintenance schedules, and collaborating closely with engineers help minimize defects and ensure efficient production. Continuous learning and staying updated with new molding technologies also support long-term success in this role.

How much does a plastic injection mold maker make?

A plastic injection mold maker typically earns between $40,000 and $70,000 annually, depending on experience, location, and skill level. Skilled mold makers with certifications and experience in CNC machining and tool design can earn higher wages and may work overtime or in specialized environments.

What are the key skills and qualifications needed to thrive as a Plastic Injection Molding Technician, and why are they important?

To thrive as a Plastic Injection Molding Technician, you need a solid understanding of manufacturing processes, mechanical aptitude, and familiarity with material properties, usually supported by a high school diploma or technical certification. Proficiency in using injection molding machines, process control software, and quality inspection tools is essential. Attention to detail, problem-solving skills, and effective communication help you stand out in this role. These skills ensure the efficient production of high-quality parts, minimize downtime, and maintain safety and productivity on the manufacturing floor.

What is the difference between Plastic Injection Molding vs Plastic Mold Designer?

AspectPlastic Injection MoldingPlastic Mold Designer
Primary RoleManufactures plastic parts by injecting molten plastic into moldsDesigns and develops molds used in plastic injection molding processes
Required SkillsMachine operation, material knowledge, quality controlCAD design, mold design, engineering principles
Work EnvironmentFactories, manufacturing plantsDesign studios, engineering offices
CertificationsMachine operation, safety certificationsCAD software certifications, engineering credentials

While Plastic Injection Molding involves the actual manufacturing of plastic parts, Plastic Mold Designers focus on creating the molds used in this process. Both roles are essential in the plastic manufacturing industry, with overlapping skills in engineering and design, but they differ in daily tasks and work environments.

Is plastic injection molding a good career?

Plastic injection molding is a stable manufacturing job that involves operating and maintaining injection molding machines, often requiring technical skills and safety knowledge. It offers opportunities for advancement and steady employment, especially for those with technical training or certifications. The industry values hands-on skills and attention to detail, making it a viable career choice for individuals interested in manufacturing and production roles.

What qualifications do you need for injection molding?

Plastic injection molding operators typically need a high school diploma or equivalent, along with technical training or on-the-job experience. Skills in machine operation, troubleshooting, and safety procedures are essential, and certifications such as OSHA safety training can be beneficial.
What are the most commonly searched types of Plastic Injection Molding jobs in Missouri? The most popular types of Plastic Injection Molding jobs in Missouri are:
What are popular job titles related to Plastic Injection Molding jobs in Missouri? For Plastic Injection Molding jobs in Missouri, the most frequently searched job titles are:
What job categories do people searching Plastic Injection Molding jobs in Missouri look for? The top searched job categories for Plastic Injection Molding jobs in Missouri are:
What cities in Missouri are hiring for Plastic Injection Molding jobs? Cities in Missouri with the most Plastic Injection Molding job openings:
Plastic Injection Molding jobs near you
Infographic showing various Plastic Injection Molding job openings in Missouri as of July 2026, with employment types broken down into 1% As Needed, 88% Full Time, 6% Part Time, 1% Temporary, 2% Contract, and 2% Nights. Highlights an 94% Physical, 3% Hybrid, and 3% Remote job distribution, with an average salary of $35,821 per year, or $17.2 per hour.

Senior Plastic Injection Molding Technologist

Serioplast

Saint Louis, MO • On-site

Full-time

Medical, Dental, Vision, Retirement, PTO

Posted 17 days ago

Job description

Serioplast, a Global Leader in Rigid Plastic Packaging, is Looking for a Senior Plastic Injection Molding Technologist for its plant in St. Louis, Missouri!
Are you a professional technologist looking for an exciting opportunity to thrive in a fast-paced, global environment? Join us and take your career to new heights!
What will you do?
  • Serve as a key point of reference for Technologists and support the Technical Manager in setting priorities, removing bottlenecks, and addressing critical issues.
  • Set up product recipes, ensuring all required regulations and PLC parameters are correctly applied.
  • Perform necessary mechanical and electronic adjustments and monitor production variables to ensure product specifications are met.
  • Conduct investigations and troubleshooting to resolve quality issues.
  • Train and support production staff in resolving minor technical problems affecting product quality.
  • Carry out electromechanical installation and setup of machines and equipment (compressors, air conditioning systems, dryers, leak testers, cameras, palletizers, etc.).
  • Develop solutions by fabricating mechanical or other components to address production or technical issues and improve machine performance.
  • Support the Technical Manager in continuous improvement projects and in decisions regarding machines, equipment, molds, and processes.

What are we looking for?
  • Excellent knowledge of plastic molding technologies (EBM and/or SBM and/or IM), with specific experience in Husky injection molding of PET preforms on high-cavitation molds.
  • Excellent applied knowledge of mechanics, pneumatics, hydraulics, electrical and/or electronic systems.
  • Good applied knowledge of measuring instruments and techniques.
  • Good applied knowledge of WCM standards.
  • Minimum 5 years’ experience working with industry specific technologies and productive processes.

What do we offer?
  • Continuous training: Grow professionally by working alongside industry experts.
  • Dynamic and international environment: Join a team engaged in global projects.
  • Career growth opportunities in an industry leading company.
  • Internal mobility: Opportunities for job rotation and career progression

Additional Perks & Benefits:
  • 401(k)
  • 401(k) matching
  • Dental insurance
  • Health insurance
  • Health savings account
  • Paid time off
  • Vision insurance
Sounds like a fit? We’d love to hear from you!
Want to know more about us? Check out Who We Are and discover what makes us unique!
Upon sending their application, the candidate grants specific consent to the processing of personal data, in accordance with current legislation on privacy. The privacy policy is available at the following link: https://drive.google.com/file/d/1qpIpYwl5rqgtH3eN8C3cgCR74cc87WSm/view?usp=drive_link
Serioplast is an equal employment opportunity employer, and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, age, protected veteran status, status as a qualified individual with a disability, or any other characteristic protected by law.

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