EP-HGS350A 20L Semi Automatic Blow Molding Machine
Der EP-HGS350A Semi-Automatic Blow Molding Machine is a heavy-duty solution engineered for producing large-volume 20L PET containers. Featuring a robust pneumatic-hydraulic linkage clamping system, it accommodates molds up to 580×390mm with a substantial 550mm stretching stroke. Equipped with digital infrared heating, the machine ensures uniform preform temperature distribution for consistent wall thickness in large bottles. Operating at a working pressure of 0.8MPa and a blowing pressure of 3.0MPa, it delivers a production efficiency of 150-400 bottles per hour. With a machine size of 2270×860×1770mm and a weight of 1500kg, the HGS350A is ideal for manufacturing industrial drums, water cooler jugs, and large beverage containers, offering stability and precision for high-capacity packaging needs.
EP-HGS350A 20L Semi Automatic Blow Molding Machine
When production calls for large-format containers, the EP-HGS350A stands as a heavy-duty semi automatic blow molding machine engineered specifically for the 20-liter segment. Built on the field-proven HGS platform, this machine applies a piston-type pneumatic hydraulic mold-locking system to deliver the clamping force and blow pressure stability required for thicker-walled, larger-volume containers. With a 550 mm stretching stroke — the longest in the HGS range — and a 580 × 390 mm pillar space that accommodates wide-diameter mold cavities, the HGS350A is purpose-built for the barrel, carboy, and bulk-container packaging applications that smaller semi automatic blowing machine models cannot reach. Industries served include drinking water, chemical distribution, industrial lubricants, and institutional cleaning products across global and Colombian markets.
Technical Specifications — EP-HGS350A Semi Automatic Blow Molding Machine
The parameters below are extracted from the HGS-350A(20L) specification and represent the verified operational envelope of the machine. Among the key figures to note: the 580 × 390 mm pillar space is significantly wider than smaller HGS models, allowing it to accept large-diameter molds required for 20-liter containers such as square carboys, round barrels, and wide-body chemical drums. The 330–400 mm mold size range and 550 mm stretching stroke define the geometric limits of bottles this semi automatic blow moulding machine can produce, and both dimensions should be confirmed against the target bottle drawing before tooling is ordered. At 1500 kg, the machine's mass reflects the reinforced frame construction required to contain the forces generated during large-volume blowing cycles.
| Semi Automatic
Blow Molding Machine Parameter |
Einheit | EP-HGS350A (20L)
Semi Automatic Blow Molding Machine |
|---|---|---|
| Pillar Space | mm | 580 × 390 |
| Mold Size | mm | 330–400 |
| Open Mold Stroke | mm | 500 |
| Stretching Stroke | mm | 550 |
| Sealing Stroke | mm | 50 |
| Power Voltage | V/Hz | 220V / 50HZ |
| Operating Pressure | MPA | 0.8 |
| Blowing Pressure | MPA | 3.0 |
| Efficiency | bph | 150–400 |
| Bottle Capacity | L | 20 |
| Machine Size (L×W×H) | mm | 2270 × 860 × 1770 |
| Maschinengewicht | kg | 1500 |
Heater Parameters
| Parameter | Einheit | HGJ-B (Wide-mouth Jar) | HGJ-CL |
|---|---|---|---|
| Power Supply | 3-Phase 4-Wire | 3-Phase 4-Wire | |
| Efficiency | bhp | 500–1200 pcs | 200–2100 pcs |
| Using Power | kW | 5–8 | 5–8 |
| Mold Wall Thickness | mm | 2.5–4.2 | 2.5–4.2 |
| Preform Holder | 18 / 36 | 96 | |
| Neck Diameter Range | mm | 130 / 65 | 68 |
| Mold Height | mm | 160 | 160 |
| Machine Size (L×W×H) | mm | 1880 × 720 × 1200 | 1500 × 600 × 1100 |
| Maschinengewicht | kg | 400 | 250 |
Why the EP-HGS350A Semi Automatic Blow Molding Machine Stands Apart
550 mm Stretching Stroke — Deepest in the Series
Large-format containers demand a longer rod travel than their smaller counterparts, because the axial stretch ratio needed to orient the PET molecular chain across a 20-liter bottle height is substantially greater than for a 1- or 5-liter format. At 550 mm, the HGS350A Semi Automatic Blow Molding Machine provides the full travel required to orient material into the base of tall carboys and water dispensing containers without thinning the sidewall to the point of mechanical failure. This engineering detail is what separates a purpose-built large-format semi automatic pet blow molding machine from a machine that has simply been scaled up without accounting for the geometric constraints of deep-stretch blowing.
Reinforced Frame for Large-Volume Blowing
At 1500 kg, the EP-HGS350A semi automatic blow molding machine's structural mass is more than three times that of the 1-liter HGS150A, reflecting the increased steel section required to maintain platen parallelism under the higher clamping loads generated when blowing large, thick-walled containers at 3.0 MPA. Frame deflection during the blowing cycle is the primary cause of persistent parting-line flash on oversized containers — a problem this machine's heavy-section welded frame directly addresses. Tie-rod alignment and platen flatness are verified on a coordinate measuring machine after final assembly, ensuring that the mold closing accuracy required to produce flash-free 20-liter bottles is achieved and maintained throughout the machine's service life on a semi auto blow moulding machine line.
Wide Pillar Space for Large-Diameter Molds
The 580 × 390 mm pillar space is the widest in the HGS series, opening the door to 20-liter mold designs that would physically not fit on smaller platforms. Square-section carboy molds, large-diameter round barrel molds, and wide-flange drum designs all require a generous daylight opening that the HGS350A provides without modification. For Colombian and South American industrial packaging buyers who source containers for water dispensers, chemical distribution, or institutional cleaning product supply, this dimensional capability means the machine can produce the format directly required by the local retail and B2B supply chain without adapting the container design to fit a smaller machine's constraints.
Digital Infrared Heating — Zone-Accurate Conditioning
Preforms for 20-liter containers are considerably heavier than those used in smaller formats, and their thick wall requires a longer infrared conditioning time with carefully calibrated zone temperatures to achieve a uniform melt front that allows complete, defect-free bottle expansion. The HGJ-B and HGJ-CL heater models supplied with the HGS350A provide zone-adjustable lamp banks that accommodate preform weights in the range typically specified for 20-liter carboy production. The result is consistent wall distribution from shoulder to base — the defining quality criterion for large containers that must withstand stacking and transport loads in the distribution chain. This thermal control capability is one of the core performance differentiators of this semi automatic molding machine platform.
Selecting the Right Semi Automatic Blow Molding Machine for Large-Format Production
Choosing a semi automatic blow molding machine for 20-liter containers requires a different evaluation framework than selecting a machine for 1- or 5-liter bottles. The three parameters that most directly determine machine suitability at this scale are pillar space, stretching stroke, and frame rigidity — in that order. Pillar space sets the maximum mold cross-section you can install; stretching stroke sets the maximum container height you can produce; and frame rigidity determines whether the machine can maintain mold-closing accuracy under the clamping forces generated at 3.0 MPA blowing pressure across the larger cavity area of a 20-liter mold.
Output rate considerations also shift at this container size. The 150–400 bottles-per-hour range on the HGS350A translates to 3,000–8,000 liters of packaged product per hour — a throughput that aligns with mid-scale water dispensing operations, institutional cleaning product bottlers, and chemical distribution companies that fill to order rather than to stock. If your filling line operates at a fixed cycle rate, matching the blow moulding output to that rate is more important than maximising bph, since excess container inventory creates handling and storage costs that erode the efficiency gains from running the semi auto molding machine at maximum speed.
Preform selection is the third decision point. The HGJ-B heater's 130 mm maximum neck diameter capability is specifically relevant for wide-mouth 20-liter containers such as water cooler bottles, which use large neck finishes to enable fast filling and dispensing. Confirm your preform neck finish standard — typically 55 mm or 63 mm for 20-liter water cooler containers — before specifying the heater model, as neck diameter compatibility determines which HGJ variant is appropriate for your production on this semi automatic moulding machine.
Tooling for 20-Liter Container Production
Preform Injection Mold
The die lip on this mold set is engineered as two precisely mated sections, maintaining the axial concentricity of the preform throughout the injection and cooling phase — a requirement that becomes more demanding as preform diameter increases. Cooling channels are routed through the mold body to extract heat from the thick-wall sections of 20-liter preforms efficiently, minimising the conditioning time needed before each preform enters the stretch-blow station. Forming components are produced from imported 2316 die steel, a grade chosen for its resistance to the corrosive effects of PET processing moisture and its stable dimensional response to heat treatment. Structural components including the core plate and cavity plate are fabricated from 420 stainless steel for long-term corrosion resistance in the production environment. The mold is designed around standard interchangeable die fittings, and its architecture supports production of more than one preform specification from a single mold set, reducing tooling cost when multiple preform designs are required.
Blowing Mold
Every blowing mold for 20-liter production is constructed from tool-grade steel with verified hardness and surface finish specifications, since the larger cavity area and higher clamping force at this scale place greater demands on mold material properties than smaller formats. The bottle geometry — including handle integration, sidewall stiffening ribs, and label panel dimensions — is developed in 3D CAD software before any cutting operations begin, enabling full virtual validation of the blow expansion path and wall-thickness distribution prior to tool manufacture. A diverse range of standard 20-liter bottle and carboy profiles is maintained in our tooling library, with custom designs developed to customer drawings or physical samples when required. The internal cooling circuit is designed to maintain even temperature distribution across the full large-area cavity surface, which is the most challenging thermal management aspect of 20-liter mold design. All mechanical components are finish-machined on CNC equipment to the dimensional tolerances required for consistent, high-quality production on a semi automatic pet blow moulding machine at 3.0 MPA.
Application Scenarios of Semi Automatic Blow Molding Machine
The 20-liter format occupies a distinct position in the packaging landscape — large enough to serve bulk distribution and refillable-container markets, yet compact enough for household use on water dispensers. The EP-HGS350A semi automatic blow moulding machine serves the following core end-use applications across global and Colombian markets.
💧 Water Cooler Bottles
The 20-liter refillable water cooler bottle is the defining application for this machine size. PET and PC materials provide the clarity, stacking strength, and food-contact compliance required for the water dispensing supply chain that is widely established across Colombia, Mexico, and other Latin American markets.
🧪 Chemical Bulk Distribution
Industrial chemicals, cleaning concentrates, and process fluids distributed in 20-liter carboys require containers with chemical resistance, stackable geometry, and secure neck-finish sealing. PCTG and HDPE-compatible preforms processed on this semi automatic pet blowing machine meet these structural and regulatory requirements.
🛢️ Edible Oil — Bulk Format
Institutional kitchens, food manufacturers, and wholesale distributors in Colombia and across South America source edible oil in 20-liter containers. The machine's wide mold space accommodates the handle-integrated body profiles that make large oil containers practical for manual pouring and dispensing operations.
🌿 Agrochemical Storage Containers
Pesticides, herbicide concentrates, and liquid fertilisers supplied to Colombian and broader Andean agricultural sectors in 20-liter containers must meet UN-rated packaging requirements for certain formulations. The chemical resistance and wall-thickness control of containers produced on this semi auto blow moulding machine support compliance with those standards.
🏭 Institutional Cleaning Products
Janitorial and institutional cleaning suppliers distribute concentrated detergents, degreasers, and sanitisers in 20-liter carboys for use in hotels, hospitals, and food processing facilities. The machine's PP and PCTG compatibility covers the chemical resistance profile required for these product categories.
🔧 Lubricants & Automotive Fluids
Engine oils, transmission fluids, and industrial lubricants packaged for workshop and fleet maintenance use in 20-liter containers benefit from the thick-wall stability and precision neck finish that the HGS350A's large-format stretch-blow process delivers, ensuring cap torque and leak-proof performance during transport.
Engineering Build & Quality Control
The EP-HGS350A semi automatic blow molding machine represents the upper end of the HGS series output range, and its construction reflects that positioning. The main structural frame is fabricated from heavy welded steel sections and stress-relieved before precision machining, a process step that eliminates the residual frame stress that causes dimensional creep over time and leads to gradual deterioration of mold-closing accuracy on machines that skip this step. The machine's 2270 × 860 × 1770 mm footprint requires a well-prepared factory floor with adequate load-bearing capacity — the 1500 kg machine weight should be factored into the civil engineering of the installation area along with the weight of the mold set, which can add several hundred kilograms at the 20-liter scale.
Partner Brands
More than two decades of focused research and development underpin every machine we produce. Our engineering team has filed multiple national patents covering innovations in mold-locking mechanisms, preform heating systems, and pneumatic circuit design — advances that are embedded across the HGS range of semi automatic blow molding machine models. We have developed tailored blowing solutions for PET, PETG, PC, PCTG, and PP materials across cosmetics, water, oil, beverage, food, pharmaceutical, and baby product packaging sectors. Our installed base spans more than 40 countries, with clients including internationally recognised brands: Yibao, Haitian, Luhua, Walch, Blue Moon, Proya, Libai, Estée Lauder, Walmart, Da Senlin, and Shining Eye Drops. This breadth of application experience informs every design decision in machines like the HGS350A, where the technical requirements of large-format production set a higher bar for mechanical and thermal engineering.
Über uns
Our manufacturing operation focuses exclusively on blow moulding equipment, and that specialisation shows in the depth of our product range and the precision of our process knowledge. The HGS350A is not a scaled adaptation of a smaller machine — it was designed from the ground up for 20-liter production, with every structural, pneumatic, and thermal parameter calculated for the specific loads and process conditions of large-format stretch-blow moulding.
Werkstatt
Auxiliary Equipment for 20L Production Lines
A complete 20-liter container production line requires more than the blow moulding unit. The following auxiliary equipment integrates directly with the EP-HGS350A and is available through our one-stop supply programme, simplifying procurement and ensuring compatibility at the system level for this semi automatic blow molding machine installation.
Air Compressor
For 20-liter blow moulding at 3.0 MPA, the required air volume per cycle is significantly greater than for smaller containers. An oil-free high-pressure compressor with adequate capacity — typically 2.0–3.0 m³/min at 40 bar — prevents the pressure drop events that cause incomplete bottle formation on large-format semi automatic blowing machine lines.
Formtemperaturregler
Managing mold surface temperature is more critical at the 20-liter scale because the larger cavity area means a greater temperature differential can develop between the centre and edges of the mold if cooling flow is not properly controlled. A dedicated mold temperature controller maintains cavity surface temperature within ±1°C across the full production shift.
Bottle Visual Inspection Machine
Automated inspection systems for 20-liter containers check wall-thickness uniformity, base drop integrity, and neck finish geometry before containers enter the filling line. For water cooler bottle and chemical container applications where leakage in the field carries significant liability, automated inspection provides a documented quality gate that manual visual checks cannot match.
Chiller & Compressor Package
Integrated chiller and compressor skids reduce the installation footprint of the utility supply, simplify electrical planning, and ensure that both cooling water and compressed air are matched to the HGS350A's rated consumption. A pre-engineered package removes the guesswork from utility sizing for new or expanding production facilities.
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