Injection–Blow Molding Process Engineer

Torrey Holistics; St. Louis (MO); On-site; USD 75,000 - 110,000; Full time

Job summary

Pretium Packaging is seeking a Process Engineer in St. Louis to join a hands-on team ensuring injection‑blow molding lines run at peak performance. You will calibrate equipment, diagnose defects, and implement corrective actions to meet strict quality standards.

You will collaborate with production, maintenance, quality, and tooling to start up equipment, resolve issues, and drive line improvements for productivity and safety across multiple molding lines.

Qualifications

• Bachelor’s or associate’s degree in mechanical/plastics engineering or related field.
• Hands-on familiarity with Aoki (ISBM/IBM/IM), Uniloy (IBM), and Zhongya (IM) machinery.
• Root cause analysis and troubleshooting expertise.
• Experience setting oven profiles and running reheat blow process.
• Experience with infeed/outfeed conveyors and line changeovers.
• Lean Manufacturing training or experience.

Responsibilities

• Start up new and existing molding equipment and perform calibrations.
• Diagnose process defects and implement corrective actions.
• Define quality control plans and inspection frequencies.
• Coordinate line setup and run parameters for new molds/tooling.
• Troubleshoot production issues and propose improvements to protect schedules.
• Lead project teams and drive improvements for safe, reliable operation.

Skills

Reheat blow process

Automation experience

Root cause analysis

oven profile tuning

Conveyor systems

Lean manufacturing

Leadership

Travel willingness

Aoki ISBM familiarity

Uniloy IBM familiarity

Zhongya IM familiarity

Education

Bachelor’s degree in mechanical/plastics engineering or related field

Associate’s degree in mechanical/plastics engineering or related field

Job description

Injection–Blow Molding Process EngineerLocation: St. Louis, MissouriCompany: Pretium PackagingYou walk the plant floor before most people have had their first coffee. A molding line is warming up; sensors blink to life. You run through start-up checks, verify calibrations, and fine-tune oven profiles so every preform hits the sweet spot. A labeler needs a timing tweak, an Aoki ISBM cell awaits a mold change, and production wants your go/no-go on a new run. This is where you thrive—hands-on, in the process, keeping quality and throughput in lockstep.About PretiumFounded in 1992, Pretium Packaging is a leading supplier of injection‑blow molded plastic containers. With 20 manufacturing locations across North America, we deliver innovative, high‑performance packaging to brand owners throughout the U.S. and Canada—backed by superior quality, value, and customer service.Your ImpactAs a Process Engineer, you’ll collaborate with production, maintenance, quality, and tooling to keep molding lines running to spec. You’ll diagnose process defects, implement corrective actions, and establish stable, efficient parameters that meet demanding quality standards.What a day could look likeStart up new and existing equipment; perform loop checks; calibrate; troubleshoot; resolve system issues to verify proper operation.Respond to urgent work orders; analyze software/hardware problems; validate fixes and restore performance.Direct system installations to ensure specs and safety requirements are met for both personnel and vendors.Define internal quality control plans, including gauging methods and inspection frequency.Assist with new project setups, tool changes, and program adjustments for smooth launches.Troubleshoot production process issues; propose alternatives to protect schedules and maintain product quality.Modify existing systems—software and circuitry—to achieve project objectives.Recommend improvements that drive safe, reliable operation of newly installed equipment.Review daily check sheets for accuracy; identify anomalies and initiate corrective action.Oversee changeovers to ensure they’re on time and executed correctly.Verify preventive maintenance is performed per schedule and documented accurately.Promote strong housekeeping and safe operating practices.Ensure weekly setup sheets are completed for all lines; investigate deviations and follow up.Investigate and resolve product quality issues through root cause analysis.Troubleshoot equipment breakdowns; replace or rebuild machine components as needed.Set up molding machines and trimmers; align/install molds; set cycles, air pressures, and water temps; position labelers; change over and adjust reamers, trim stations, and material inspection systems; dial in sequence timing.Coordinate production schedules for maximum efficiency and productivity.Implement line improvements that lift productivity and enhance product quality.Process new molds/tooling, establishing run parameters for best efficiency.What you bringBachelor’s or associate’s degree in mechanical/plastics engineering or related field.Reheat blow process and automation experience.Hands-on familiarity with Aoki (ISBM/IBM/IM), Uniloy (IBM), and Zhongya (IM) machinery.Root cause analysis and troubleshooting expertise.Experience setting oven profiles.Infeed and outfeed conveyor experience.Effective leadership and decision-making; able to lead and drive project teams.Strong organization, accuracy, and attention to detail.Training or experience in Lean Manufacturing practices.Ability to travel and train as needed throughout the region.Why PretiumWe manufacture rigid plastic containers for some of the most recognized brands. Our plants emphasize safety, performance, and continuous improvement—giving you the platform to make a measurable impact while growing your career.Technical strengths we valueContinuous ImprovementProcess EngineeringPlastics – PA6 ExperiencePlastics – PA66 Materials ExperiencePlastic Extrusion Experience