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Plastic Injection Molding Jobs in Missouri (NOW HIRING)

LFP Associates

Operations Manager

Kansas City, MO

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 · On-site

$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 Sep 2, 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 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 the key skills and qualifications needed to thrive as a plastic injection molding technician?

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 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.

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.

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 August 2026, with employment types broken down into 94% Full Time, and 6% Nights. Highlights an 100% In-person job distribution, with an average salary of $35,821 per year, or $17.2 per hour.

Plastic Injection Molding Process Technician

Permian Plastics LLC

O Fallon, MO • On-site

$23.10 - $30.96/hr

Full-time

Posted 4 days ago

Job description

Description:

Permian Plastics is seeking a Plastic Injection Process Technician to support our injection molding operations in O’Fallon, Missouri. This position is responsible for maintaining stable, efficient molding processes while troubleshooting production issues, improving process performance, and supporting the safe production of quality parts.


Key Responsibilities:

  • Set up, start up, monitor, and adjust injection molding processes to maintain quality, efficiency, and consistent production.
  • Troubleshoot molding defects, process variation, equipment concerns, and production interruptions.
  • Sample new molds and assist in identifying process or tooling refinements necessary to achieve production requirements.
  • Monitor cycle times, scrap rates, and overall process performance and recommend improvements when targets are not being achieved.
  • Optimize molding processes to improve efficiency, reduce scrap, and support production goals.
  • Document optimized processes and maintain accurate process and set-up information, including mold temperatures, water configurations, hot sprue settings, nozzle information, ejector settings, and common processing issues and solutions.
  • Identify tooling, maintenance, material, or equipment concerns and communicate or submit appropriate work requests when issues are identified.
  • Work closely with Production, Quality, Maintenance, and Tooling to resolve manufacturing issues.
  • Provide processing expertise, technical guidance, and support to production employees and leadership.
  • Follow and support all company safety, quality, and operating standards.
  • Identify opportunities for improved equipment, technology, processes, safety, efficiency, and cost reduction.
  • Maintain tools and work areas in a safe and organized condition.
  • As an individual contributor, provide operational guidance and backup support for shift supervision when coverage is needed.
  • Perform other duties as assigned.
Requirements:
  •  Minimum of 2 years of experience in plastic injection molding or equivalent demonstrated injection molding experience and technical capability.
  • Working knowledge of injection molding processes, materials, molds, and related production equipment.
  • Ability to troubleshoot molding defects and identify appropriate processing adjustments.
  • Strong mechanical aptitude and problem-solving skills.
  • Ability to read, follow, and accurately document process parameters and production requirements.
  • Ability to work independently and collaborate effectively with Production, Quality, Maintenance, Tooling, and leadership.
  • Ability to work in a fast-paced manufacturing environment and respond effectively to changing production priorities.
  • Forklift certification or ability to obtain certification.
  • Ability to meet the physical requirements of the position, including prolonged standing and walking and working with hands and tools above shoulder height.
  • Steel-toe safety shoes or boots are required.

Schedule & Compensation:

Multiple shifts are available.

Pay range: $23.10–$30.96 per hour,(plus shift differential compensation), with starting pay based on relevant injection molding experience, demonstrated technical capability, and qualifications.