Case Study Approach in Packaging Injection Molding
The packaging industry represents one of the most demanding application fields for injection molding technology, where extremely high production speed, very short cycle times, and minimal cost per part must be achieved simultaneously. In food, cosmetic, and beverage packaging, key requirements include thin wall sections, high surface quality, functional features such as film hinges and closures, and very high production volumes.
Injection molding machines used in packaging applications are expected to deliver:
- Stable operation at extremely short cycle times
- The ability to process both thin-wall and thick-section parts on the same platform
- Full compatibility with hot runner systems
- High mechanical rigidity for large shot weights
- Long-term repeatability in continuous serial production
Dr. BOY injection molding machines meet these requirements through their compact design and well-balanced injection characteristics. The following case studies are based on real production examples and include detailed technical and numerical data.
Case Study 1 - PP Pedestal Cup (Tulip Cup)
Application Description
Production of a thin-walled PP pedestal cup used in food packaging applications. The part combines aesthetic appearance with extremely short cycle time requirements.
Technical Data
Part type: Pedestal cup (tulip cup)
Material: PP
Part weight: 12.6 g
Shot weight: 12.6 g
Machine: BOY 30 M
Screw diameter: 28 mm
Cycle time: 4.6 s
Number of cavities: 1
Runner system: Hot tip gating (Vorkammer nozzle)
Process Challenge
Maintaining surface quality at very short cycle times and minimizing gate marks from point gating.
Dr. BOY Advantage
Stable injection behavior and fast mold movements enabled high surface quality at a very low cycle time.
Case Study 2 - Thick-Wall PC Cosmetic Jar
Application Description
Production of a thick-wall, high-transparency cosmetic jar made from polycarbonate, used in premium cosmetic packaging.
Technical Data
Part type: Cosmetic jar
Material: PC
Part weight: 44.3 g
Shot weight: 88.6 g
Machine: BOY 55 M
Screw diameter: 38 mm
Cycle time: 45 s
Number of cavities: 2
Runner system: Hot runner
Process Challenge
Long cooling time due to thick wall sections, prevention of sink marks, and preservation of optical surface quality.
Dr. BOY Advantage
High clamping stability and controlled cooling resulted in deformation-free production of thick-wall parts.
Case Study 3 - ABS Box and Lid with 0.5 mm Wall Thickness
Application Description
Production of an ultra-thin-wall ABS box and lid for small packaging applications.
Technical Data
Part type: Box and lid
Material: ABS
Part weight: 1.5 g
Shot weight: 6.1 g
Machine: BOY 55 A - 79
Screw diameter: 22 mm
Cycle time: 4.2 s
Number of cavities: 2 + 2
Runner system: Hot runner
Process Challenge
Achieving homogeneous filling at a wall thickness of only 0.5 mm while precisely controlling high injection speeds.
Dr. BOY Advantage
A finely tuned injection profile enabled defect-free serial production of ultra-thin-wall components.
Case Study 4 - PP Food Container with Film Hinges (Lunchbox)
Application Description
Production of a PP food storage container featuring two integrated film hinges.
Technical Data
Part type: Food storage container
Material: PP
Part weight: 90.6 g
Shot weight: 90.6 g
Machine: BOY 90 A
Screw diameter: 42 mm
Cycle time: 10.5 s
Number of cavities: 1
Runner system: Dual hot runner
Process Challenge
Forming durable and flexible film hinges without creating brittleness during molding.
Dr. BOY Advantage
Smooth injection transitions and stable holding pressure ensured long-life, flexible film hinges.
Case Study 5 - PET Preform Production (Special Machine Configuration)
Application Description
Production of PET preforms for beverage packaging. This application requires a special machine configuration due to high shot weight and multi-cavity mold design.
Technical Data
Part type: PET preform
Material: PET
Part weight: 19 g
Shot weight: 152 g
Machine: BOY 90 A
Screw diameter: 48 mm
Cycle time: 25 s
Number of cavities: 8
Runner system: Hot runner
Process Challenge
High shot weight, narrow processing window of PET material, and balanced filling across eight cavities.
Dr. BOY Advantage
A powerful plasticizing unit and stable injection behavior ensured consistent weight and dimensional accuracy of PET preforms.
Overall Evaluation - Results from Packaging Case Studies
These packaging injection molding case studies clearly demonstrate the strengths of Dr. BOY injection molding machines:
- Excellent compatibility with PP, ABS, PC, and PET packaging materials
- Capability to process both thin-wall and thick-section parts on the same platform
- High process stability at extremely short cycle times
- Full integration with hot runner and point-gate systems
- Repeatable quality in high-volume serial production
Conclusion - Why Choose Dr. BOY for Packaging Injection Applications?
Dr. BOY injection molding machines are not only compact and fast solutions for packaging production; they represent a robust manufacturing platform delivering high productivity, superior surface quality, and long-term process reliability. These real industrial case studies clearly demonstrate why Dr. BOY is a trusted choice for food, cosmetic, and beverage packaging applications.
