Introduction to One-Step Injection Stretch Blow Molding
A single stage injection stretch blow molding machine utilizes a highly advanced, integrated plastic container forming technology. This process is universally recognized as the gold standard for manufacturing high-precision, visually demanding, and strictly regulated hollow plastic products. While versatile enough for baby bottles, luxury cosmetics, and food packaging, it truly excels in rigorous pharmaceutical applications, such as the production of sterile contact lens solution bottles. Our equipment effortlessly processes a wide variety of materials, including PET, PETG, PP, PC, Tritan, PS, ABS, and PLA.
The defining feature of this one step blow molding machine for pharmaceutical bottles is continuous integration. The three critical stages—injection, stretching, and blow molding—are executed sequentially within the exact same enclosed equipment. By completely eliminating intermediate handling, cooling, and storage, this process drastically reduces the risk of biological contamination, ensuring the absolute product stability, sterility, and regulatory compliance required for eye care products.
The Streamlined, Contamination-Free Process Flow
1. Injection
High-Precision Preform Molding
2. Thermal Conditioning
Preform Tail Cutting & Heat Preservation
3. Stretch Blow Moulding
Biaxial Orientation for Strength
4. Bottle Take-out
Automated & Sterile Ejection
Core Advantages & Equipment Benefits
- Highly Efficient & Energy-Saving: Eliminates the need to cool and subsequently reheat preforms. By utilizing the residual temperature directly from the injection phase, overall energy consumption is slashed by approximately 40%.
- Exceptional Product Performance: Mechanical stretching perfectly orientates the plastic molecules. This significantly enhances the container’s compressive strength, gas barrier properties, and optical transparency.
- High Precision & Dimensional Stability: Full-process automated control virtually eliminates human error. This is critical for eye care products, where tight thread tolerances are mandatory to prevent leaks and ensure tamper-evident seals fit perfectly.
- Optimized Material Utilization: The one-step technique generates minimal waste, maintaining environmentally friendly operations while lowering material overhead.
Equipment Benefits Summary: Exceptionally low energy consumption, reduced labor dependency, a compact facility footprint, highly competitive unit pricing, and rock-solid operational stability in strictly controlled cleanroom environments.
Technical Comparison: Ever Power vs. Japanese/European Models
| Specification Area | Ever Power ISBM Equipment | Mainstream Japanese / European Brands |
|---|---|---|
| Initial Capital Investment | Highly cost-effective, ensuring rapid ROI | Premium pricing, slower capital recovery |
| Energy Efficiency | Advanced thermal optimization yields ~40% savings | High efficiency, standard power baselines |
| Maintenance Costs | Low cost, utilizing standardized accessible parts | High cost, reliance on exclusive proprietary parts |
| Customization Flexibility | Fast mold changeovers (≤60 mins), highly flexible for complex medical designs | Often rigid procedures, slower mold adjustments |
Equipment Composition & Key Technologies
Our integrated machinery is constructed from five critical subsystems: Injection, Heating, Stretch Blow, Mold, and Control systems.
1. Injection System
This system utilizes a high-precision servo-driven injection unit, equipped with a dedicated barrel to ensure flawlessly uniform melt plasticization.
Highlight: The image below showcases our exclusive, patented injection screw design developed specifically for superior melt stability and clarity.
- High-precision temperature control system (accuracy maintained within ±1℃).
- Servo-driven injection unit (lightning-fast response speeds and superb repeat accuracy).
- Preform wall thickness control system (optimizes resin distribution via fine axial or radial adjustments).
2. Heating System
Utilizes advanced heating bands or a hybrid water/oil temperature conditioning matrix, monitored continuously by precision sensors.
- Zoned heating control (delivers pinpoint temperature regulation across different sections of the preform).
- Non-contact temperature measurement (protects the preform surface from mechanical blemishes).
- Adaptive heating power adjustments (automatically tunes parameters based on live operational speeds).
3. Stretch Blow Molding System
Integrates stretch rods, blow cores, and a high-pressure air source to meticulously execute the axial and radial expansion of the preform.
- Dynamic stretching mechanism (achieves speeds up to 400mm/s with a positional precision of ±0.1mm).
- Independent high-pressure regulating valves (secures pressure fluctuations strictly within ±0.05MPa).
- Stretch-blow synchronous control technology (guarantees perfect coordination during the expansion phase).
4. Mold System
The mold system houses the preform mold, blow mold, and specialized cooling channels. We deploy a highly efficient rotary multi-station structure, available in 3 or 4 stations depending on your specific bottle design requirements.
3-Station Mold Setup
Integrates Injection, Stretch Blow, and Ejection. Optimal for high-speed standard medical container production.
4-Station Mold Setup
Includes a dedicated Temperature Conditioning station. Essential for complex shapes and ensuring even wall distribution for precise squeeze functions.
- High-precision mold machining (achieves cavity surface roughness of Ra≤0.8μm).
- Advanced cooling system (optimized waterway designs shorten the cooling cycle by 30%).
- Rapid mold changeover technology (swap out entire mold sets in ≤60 minutes).
Exceptional Machine Wiring and Assembly Detailing:
In addition to machinery, we expertly design and manufacture premium mold products tailored to your exact medical container specifications.
5. Control System
Features an independent, highly centralized control hub for seamless oversight and automated process optimization.
- Multi-axis motion control system (guarantees exact mechanical synchronization across all stations).
- Adaptive process parameter optimization (auto-adjusts settings based on real-time production feedback).
- Remote monitoring and fault diagnosis systems (drastically improves overall equipment uptime and stability).
Material Applications & Product Capabilities
Our integrated energy efficient one step blow molding machine solutions process a broad range of thermoplastics effortlessly:
- Polyethylene Terephthalate (PET): Widely applied for beverages and specific medical containers, known for high transparency, strong barrier resistance, and recyclability.
- Polypropylene (PP): The absolute standard for contact lens solution bottles and hot-fill containers. It is highly squeezable, easily sterilizable, and possesses excellent chemical resistance.
- Polyethylene Terephthalate Glycol (PETG): A premium material for high-end cosmetics. It features glass-like clarity, high viscosity, incredible chemical resistance, and powerful anti-stress whitening capabilities.
- Polycarbonate (PC): Utilized for premium baby bottles and medical devices, boasting massive structural strength and heat resistance.
Leveraging this machinery, factories can seamlessly manufacture:
- Round or complex contoured beverage bottles (capacities 5ml to 20L).
- Pharmaceutical packaging (contact lens solution bottles, eye droppers, pill bottles, oral liquid vials).
- Food packaging containers (edible oil jugs, condiment jars).
- Daily chemical and premium cosmetic packaging (nail polish remover bottles, perfume containers).
The Crucial Role of Oil-Free Air Compressors in Pharmaceutical Production
When configuring a high-precision production line for FDA-compliant contact lens bottles, the quality of your auxiliary equipment dictates the safety of the final product. A high-performance air compressor is absolutely critical. During the stretch blow phase, high-pressure air forcefully expands the melted plastic against the mold cavity to form the bottle. Because this air makes direct contact with the interior walls of the container, its purity cannot be compromised.
Pharmaceutical products have the most stringent hygienic and purity standards globally. Standard factory compressors frequently leak microscopic oil vapors and moisture into the airflow. If this contaminated air enters the bottle, it will ruin the sterile environment and contaminate the lens solution when filled. We provide specialized Oil-Free Screw Air Compressors explicitly matched to our blowing machinery. These units guarantee a continuous stream of 100% pure, dry, oil-free high-pressure air. By choosing our integrated compressor solution, you ensure the absolute sterility of your optical care bottles, eliminate regulatory compliance risks entirely, and greatly extend the lifespan of your machine’s pneumatic components.
Genuine Customer Reviews
“Absolute hygiene and dimensional stability are non-negotiable for our optical care product lines. This automated line, combined with their oil-free air compressor, allowed us to ramp up our PP contact lens bottle production seamlessly with zero contamination events. The thread precision ensures our tamper-evident caps fit flawlessly every time.”
— Operations Manager, Pharmaceutical Packaging Co., USA
“We needed a highly reliable solution to manufacture specialized medical containers that meet FDA standards and can be easily sterilized. Ever Power’s machine handles these requirements perfectly. The structural integrity of the bottles is flawless, and our defect rate dropped to near zero.”
— Packaging Director, Global Medical Supplies Brand, France
“As a contract manufacturer handling dozens of custom bottle shapes for the health sector, operational agility is everything to us. The fast 60-minute mold changeover on these ISBM machines has drastically improved our factory’s output flexibility and the energy efficiency has significantly boosted our bottom line.”
— Plant Manager, Custom Plastics Solutions, Japan
Frequently Asked Questions (FAQs)
1. Why is the 1-step process essential for FDA compliance in eye care products?
In a 2-step process, preforms are created, ejected into bins, stored, and transported to a separate blowing machine later. Every transfer point introduces a severe risk of dust, human touch, or bacterial contamination. The 1-step process creates the bottle continuously in an enclosed space from molten plastic to finished container, maintaining the high sterility levels required by the FDA.
2. What material is typically used for squeezable contact lens solution bottles?
PP (Polypropylene) or specific medical-grade PET materials are most commonly used. They provide the necessary flexibility for the consumer to squeeze the bottle, while maintaining excellent chemical resistance and sterilizability.
3. Can this equipment guarantee the tight thread tolerances needed for tamper-evident caps?
Absolutely. The injection phase of our ISBM machine forms the neck and threads of the bottle with pinpoint accuracy, completely independently of the blowing phase. This ensures that every bottle has identical, leak-proof threading perfect for medical caps.
4. Is this machine suitable for cleanroom environments?
Yes. Our machines are designed with a compact footprint, enclosed operating areas, and run on precise, clean electrical servos rather than relying entirely on messy hydraulics. They are routinely installed in cleanroom environments worldwide.
5. Why is an oil-free air compressor strictly necessary?
The compressed air touches the interior of the contact lens bottle to form it. If you use a standard compressor, trace amounts of oil and moisture will contaminate the inside of the bottle, violating FDA safety standards. An oil-free screw compressor ensures 100% pure air.
