Enjeksiyonlu Gerdirme Şişirme Kalıplama Makinesi Tam İşlem Kılavuzu

Round molecules with large air gaps → weak barrier, low strength

Cross-shaped molecules lock together → exceptional barrier & impact strength

Stage 1 — Injection Molding: Preform Production

The process begins with the introduction of plastic resin granules — typically PET, PP, or PC — into the injection unit’s barrel. Precisely controlled barrel heaters melt the resin to a homogeneous molten state. The molten polymer is then injected under high pressure into a precision-engineered preform mold.

The preform mold forms the preform: a test-tube-shaped intermediate component that carries the bottle’s finished neck and thread geometry, but with a thicker wall and substantially smaller diameter than the final container. This preform defines the bottle’s opening dimensions with micron-level precision — a critical advantage over extrusion-based alternatives.

After injection, the preform is cooled inside the mold to solidify and lock in its geometry before transfer to the next station.

Stage 2 — Preform Conditioning: Temperature Control

In the Single-Stage ISBM process, the preform retains its latent heat from injection and is transferred directly to the conditioning station — eliminating the need for a secondary reheating cycle. In the Two-Stage process, pre-manufactured preforms are reheated in this station using infrared or near-infrared heating lamps.

Temperature conditioning is one of the most critical variables in the entire ISBM workflow. The preform must be brought to a precise, uniform temperature — typically between 90°C and 120°C for PET — throughout its entire wall thickness. Uneven temperature distribution at this stage is the primary cause of non-uniform wall thickness and optical defects in finished containers.

Advanced ISBM machines from ISBM Solution feature multi-zone temperature sensors and closed-loop feedback controls to maintain ±1°C uniformity across the preform body, delivering consistent stretch behavior in the next stage.

Stage 3 — Stretch Blow Molding: Shaping the Container

This is the defining stage of the ISBM process. The conditioned preform is loaded into the blow mold and clamped. A mechanical stretch rod is then inserted into the preform and drives it axially downward — elongating the preform to the full height of the blow mold cavity. This axial stretching aligns the polymer chains vertically.

Simultaneously (or in a precisely timed two-phase sequence depending on machine design), high-pressure air — typically between 25 and 40 bar — is introduced into the preform. The pressurized air expands the preform radially outward against the blow mold walls, completing the biaxial orientation of the polymer. The container takes on the exact shape of the blow mold cavity with remarkable dimensional accuracy.

This combination of axial stretching and radial blowing results in a bottle with uniform wall thickness distribution, superior impact resistance, excellent optical transparency, and outstanding gas barrier performance — ideal for carbonated soft drinks, mineral water, and pharmaceutical liquids.

Stage 4 — Cooling & Ejection: Finalizing the Product

After the blow molding phase, the newly formed container remains inside the closed blow mold while the mold’s internal cooling channels circulate chilled water around the bottle. Cooling time is determined by wall thickness, material type, and target mold temperature — typically ranging from 1 to 4 seconds in high-speed production.

Once the container has reached sufficient rigidity, the blow mold opens and the finished bottle is automatically ejected onto a take-out conveyor. Automated vision inspection systems can be integrated at this point to detect dimensional non-conformances, optical defects, and surface contamination before bottles enter the packaging line.

Any residual flash or tail material is trimmed, and the containers proceed directly to filling, labeling, or secondary packaging — completing a fully continuous, integrated production cycle.

Injection Molding Unit

Comprises the hopper, barrel, screw, and injection nozzle. Converts plastic resin granules into a homogeneous melt and delivers it under controlled pressure into the preform mold. Screw design is matched to the target resin’s rheological properties.

Preform Conditioning System

Multi-zone heating/cooling infrastructure that manages preform temperature to within ±1°C. In single-stage systems, this leverages residual heat from injection; in two-stage systems, infrared lamp banks provide precise reheat profiling.

Stretch Blow Molding Unit

Houses the stretch rod mechanism, blow valve block, and blow mold clamping assembly. The stretch rod is servo-driven for precise stroke control. High-pressure air circuits provide pre-blow (low pressure) and main blow (high pressure) phases.

Mold Clamping System

Provides the locking force to hold preform and blow molds closed against injection and blow pressures. Servo-electric and hydraulic toggle systems offer different performance profiles for high-speed and precision applications respectively.

PLC Control & HMI

Central PLC manages all machine axes, temperature zones, timing sequences, and safety interlocks. Touch-screen HMI allows operators to adjust process parameters, store recipes, monitor live production data, and diagnose alarms in real time.

Mold Cooling System

Chilled water circuits integrated into the blow mold base and cavity panels. Coolant temperature and flow rate are independently regulated per mold zone to ensure even solidification and consistent container wall geometry.

Energy Efficiency

Single-stage ISBM machines utilize residual heat from the injection stage, eliminating secondary reheating. This integrated approach delivers approximately 30% lower power consumption compared to multi-stage systems, reducing both operating costs and carbon footprint.

Precision Neck Finish

Because the bottle neck is formed first by injection molding, ISBM delivers micron-level dimensional accuracy on thread profiles, sealing surfaces, and opening diameters — critical for tamper-evident caps, pharmaceutical closures, and precision dispensing systems.

Superior Barrier Properties

Biaxial orientation significantly reduces the permeability of PET and PP containers to oxygen, CO₂, and moisture — extending product shelf life and preserving the freshness and carbonation of beverages without requiring additional barrier coatings.

High Automation

Servo-driven axes, PLC process control, and integrated robotics minimize human intervention across the entire production cycle. One operator can efficiently supervise multiple ISBM machines simultaneously, reducing labor costs and improving production consistency.

Sustainable Production

The stretching process optimizes material distribution across the container wall, allowing manufacturers to achieve target mechanical properties with less resin. This lightweight design approach reduces raw material consumption, transport weight, and facilitates end-of-life recyclability.

Design Flexibility

From 1ml medical vials to 1000ml cosmetic jars, ISBM accommodates an exceptionally wide range of container geometries, neck sizes, and design styles. Quick-change tooling systems enable efficient SKU changeovers for brand-specific customization.

ISBM (Injection Stretch Blow Molding) includes a mechanical stretching step using a stretch rod before blowing, which creates biaxial molecular orientation in the polymer. This results in containers with significantly higher strength, better clarity, and superior gas barrier properties compared to IBM (Injection Blow Molding), which goes directly from injection to blowing without any stretching phase. ISBM is the preferred choice for PET bottles and performance packaging.

Single-Stage ISBM is ideally suited for small to medium production volumes — typically from a few thousand to 50,000 containers per day — as well as specialty, custom-shaped, or multi-SKU packaging where flexibility and quick changeover are valued. Two-stage systems are preferred when daily production exceeds 50,000–100,000+ units and maximum throughput speed is the priority.

ISBM-produced PET containers offer comparable or superior barrier performance to glass at a fraction of the weight (typically 90% lighter), eliminating breakage risk and reducing transport costs and CO₂ emissions. PET is fully recyclable, FDA-approved for food and pharmaceutical contact, and allows brand differentiation through transparent, crystal-clear container designs that showcase product color and quality.

ISBM cycle times vary based on container size, wall thickness, material, and cavity count. For standard PET water bottles (500ml, 2-cavity), a typical single-stage cycle time is between 12 and 18 seconds. High-speed multi-cavity systems for thin-wall PET can achieve sub-10-second cycles. Larger or thicker-walled containers (pharmaceutical PP jars, for example) may require 20–35 second cycles.

Material waste in ISBM is minimized by optimizing preform weight through precise injection control, tuning stretch ratios to achieve target wall thickness with minimum material, regularly auditing gate and runner design, and implementing closed-loop weight monitoring at the preform stage. Since ISBM produces no parting line flash (unlike EBM), material efficiency is inherently higher. Regrinding of neck trimming waste can recover additional material where regulatory standards allow.