Apollo, a Wanplas factory based in Zhangjiagang near Shanghai, has built extrusion blow molding machines for over 20 years, with more than 4,000 sets running in over 90 countries. This guide explains how a 6L fast mold change EBM machine supports mixed production of cooking oil and vinegar jerrycans on a single line. You will learn the process, the machine architecture, the right HDPE grade, and how to keep every container leak-proof and food-contact compliant.
What Is Extrusion Blow Molding for Jerrycans
Extrusion blow molding (EBM) is a hollow molding process that forms plastic containers by extruding a molten tube of polymer, called a parison, and inflating it inside a cooled mold. The process fits jerrycans because it handles handled, irregular shapes and large wall sections better than most alternatives. A 6L jerrycan with a built-in handle and a rectangular body is a classic EBM product.
The cycle starts in the single-screw extruder, where polymer pellets melt inside the barrel and advance through a screw with a defined L/D ratio. The melt passes through a die head that shapes the parison to the correct diameter and wall profile. A parison programmer then varies wall thickness along the length so the handle and corners receive enough material.
Two mold halves close around the hanging parison and clamp it at the neck. A blow pin injects compressed air, pushing the soft parison against the cavity wall. Cooling channels solidify the part, the mold opens, and the finished jerrycan is ejected and deflashed. EBM accepts HDPE, PP, PVC, and several engineering plastics, which makes it flexible for edible and non-edible liquids alike.
For cooking oil and vinegar, EBM offers a decisive advantage: the same machine and the same base material serve both products through a quick mold swap. That capability is the core of mixed production, and it is why a 6L fast mold change EBM machine earns its place in a contract filler or a regional brand plant.
Why 6L Containers Fit Cooking Oil and Vinegar
The 6L size sits in a sweet spot for household and food-service edible liquids. Cooking oil in 6L covers family and restaurant use without exceeding safe manual handling weight when full. Vinegar in 6L serves bottling lines, condiment kitchens, and cleaning-formula blenders that buy in mid-volume drums.
Both liquids share a key requirement: the container must not interact with the product. Cooking oil slowly penetrates some polymers and turns rancid if oxygen reaches it through a weak wall. Vinegar carries acetic acid that attacks many plastics and metals. HDPE resists both, which is why HDPE jerrycans dominate this segment worldwide.
A rectangular 6L jerrycan also optimizes transport and shelf space. The integrated handle supports pouring, and the wide neck speeds filling and cleaning. EBM forms the handle and body in one shot, so there is no secondary assembly and no leak path at a welded seam.
Mixed production on one line means the plant buys one machine, one material stream, and one operator skill set. The only variable is the mold and the stored process recipe, which a fast mold change system swaps in minutes rather than hours.
Anatomy of a Fast Mold Change EBM Line
A modern 6L EBM line is a coordinated system of extrusion, parison control, clamping, blowing, cooling, and downstream handling. Each subsystem decides the final wall quality, output, and changeover speed. Understanding the layout helps buyers match a configuration to their real mix of cooking oil and vinegar SKUs.
Extruder and Barrel
The single-screw extruder plasticizes HDPE at a stable melt temperature. The barrel uses hardened nitriding or bimetallic lining to survive abrasive filler and long runs. Screw diameter and L/D ratio set the available melt flow for the parison, which limits maximum container size and cavitation.
Die Head and Parison Programmer
The die head shapes the parison and can be continuous or accumulator fed. A continuous head suits steady 6L output, while an accumulator head serves larger shots and reduces sag. The parison programmer adjusts die gap at many points along the drop, tuning wall thickness where the handle and corners need strength.
Clamping and Mold Base
The clamping unit holds the mold shut against blow pressure. For fast mold change, the platen carries a standardized mold base with hydraulic clamp and quick water and air couplings. The base lets operators slide one mold out and another in without re-plumbing every line.
Blow, Cooling, and Deflash
Compressed air inflates the parison, and chilled mold water sets the shape. Automatic deflash trims neck and parting-line flash, and a conveyor moves parts to leak testing. The whole sequence repeats every cycle, and the PLC stores recipes so each product reloads its own parameters.
Apollo ABLB Series for 6L Mixed Production
Apollo’s ABLB Series covers containers from 200 mL to 20 L, which places the 6L cooking oil and vinegar jerrycan squarely inside its core range. The series offers eight machine types with double-station and multi-head options, so a buyer can scale from a flexible mixed run to a high-cavity single-SKU line. The table below lists a typical 6L-class configuration used for mixed edible-liquid production.
| Parameter | ABLB 6L Configuration | Note |
|---|---|---|
| Max container volume | 6 L (up to 10 L) | ABLB Series covers 200 mL to 20 L |
| Number of stations | Double station | サポートs mixed or parallel molds |
| Die head type | Continuous or accumulator | Continuous for steady 6L runs |
| Screw diameter | 70 mm | Single-screw extruder |
| L/D ratio | 24:1 | Stable HDPE plasticizing |
| Extruder motor | 30 kW | Closed-loop drive |
| Heating power | 18 kW | Barrel and die zones |
| Clamping force | 60 kN | Holds mold against blow pressure |
| Mold platen size | 420 x 420 mm | Fits 6L jerrycan mold |
| Installed power | 58 kW | Typical 6L-class draw |
| Cooling water | 3 m3/h | Chilled mold circuit |
| Output (6L, single cavity) | 110 to 150 pcs/h | Per station, HDPE |
| Machine weight | 4.5 t | Approximate |
The ABLB line pairs the hardware above with Apollo’s recipe management, so cooking oil and vinegar jerrycans each keep their own temperature, parison, and timing setpoints. When the run switches, the operator selects the recipe and the PLC restores every value, removing manual re-entry errors.
Modularity also protects the investment. The same ABLB base accepts larger platens and extra heads as volume grows, so a plant that starts with mixed 6L jerrycans can later add cavities for a steady single-SKU cooking oil run without replacing the extruder. Apollo designs the clamping and control platform to scale within the 200 mL to 20 L family, which keeps spare parts and training common across the upgrade.
The Fast Mold Changeover System
Mixed production lives or dies by changeover time. A fast mold change system reduces the gap between the last vinegar jerrycan and the first cooking oil jerrycan from hours to minutes. The saving comes from standardization, not from rushing the operator.
The mold base uses a common platen pattern across the 6L product family. Hydraulic clamps release and lock the mold, and push-pull couplings connect cooling water, air, and blow lines in one motion. Alignment pins seat the mold precisely, so the first shot already hits target neck and handle position.
Recipe storage is the second half of the system. Each jerrycan stores extruder temperature, screw speed, parison profile, blow pressure, and cooling time. On changeover, the line reloads the recipe automatically and the HMI confirms setpoints before the operator starts production.
A practical mixed run might alternate cooking oil and vinegar jerrycans by the day or by the shift. With 15 to 30 minute changeovers, a single ABLB line serves both SKUs without a second machine standing idle. That flexibility matters for contract packers and regional brands with seasonal demand swings.
Material Selection: HDPE Grades for Edible Liquids
Material choice decides taste neutrality, shelf life, and regulatory clearance. For cooking oil and vinegar jerrycans, blow molding grade HDPE is the default, with PP as a hot-fill option. The table contrasts the two and shows why HDPE leads the 6L edible-liquid segment.
| Material | Density g/cm3 | MFR g/10min | Key property | Food contact | Best use |
|---|---|---|---|---|---|
| HDPE (blow grade) | 0.945 to 0.965 | 0.3 to 1.0 | Oil and acid resistance | FDA, EU 10/2011 | Cooking oil, vinegar |
| PP (homopolymer) | 0.90 to 0.91 | 1.0 to 3.0 | Hot-fill up to 100 C | FDA, EU 10/2011 | Hot-filled vinegar |
| HDPE with ESCR add. | 0.945 to 0.955 | 0.3 to 0.8 | Stress-crack resistance | FDA, EU 10/2011 | Long oil storage |
Cooking oil demands environmental stress crack resistance (ESCR) because the wall stays in contact with oil for months. A blow grade with good ESCR avoids slow cracking at the handle root. Vinegar demands acid resistance, and HDPE is inert to acetic acid at typical concentrations, so it protects both product and consumer.
Food-contact clearance depends on the resin certificate as much as the machine. Buyers should request the supplier’s FDA and EU 10/2011 declaration and keep it with the production record. Apollo advises running edible lines on a dedicated, clean material stream to protect taste and compliance.
Recycled content is possible through a co-extruded or compliant blend, but for edible liquids the inner layer must stay virgin food-grade HDPE. The outer layer may carry recycled content where local rules allow, lowering cost and environmental load without risking the product.
Process Parameter Optimization
Stable parameters turn a good mold into a consistent jerrycan. The values below are typical windows for 6L HDPE jerrycans and should be confirmed by trial on the actual mold. The goal is uniform wall, clean neck, and short cycle without over-cooling.
| Parameter | Recommended window | Effect on part |
|---|---|---|
| Melt temperature | 160 to 210 C | Flow and parison stability |
| Screw speed | 40 to 70 rpm | Melt homogenization |
| Blow pressure | 0.6 to 1.0 MPa | Corner and handle fill |
| Parison points | 32 to 64 | Wall thickness control |
| Mold temperature | 10 to 20 C | Cycle and surface |
| Cooling time | 8 to 14 s | Demold without warp |
Melt temperature sets parison stability. Too cold and the parison folds; too hot and it sags and thins at the handle. The parison programmer moves wall material from thick body sections into the handle and bottom corners, where jerrycans fail first.
Blow pressure must reach the far corners of a rectangular 6L shape. Pressure-decay leak testing later confirms the seal, but correct blowing prevents thin spots that testing would reject. Cooling time balances output against warpage; a part released early twists and fails the cap fit.
Apollo’s ABLB controls keep these setpoints in the recipe, so mixed cooking oil and vinegar runs return to target every time. The result is low scrap and steady output across a long production week.
Leak-Proof Quality Assurance
A jerrycan that leaks cooking oil or vinegar is a product recall waiting to happen. Leak-proof performance comes from design, process, and test together, not from a single control. Apollo builds all three into the ABLB line for edible-liquid service.
Wall thickness distribution is the first defense. The parison programmer places material where stress concentrates, especially at the handle junction and the bottom weld. A uniform, programmable wall removes the thin spots that start as weeps and grow into leaks.
The neck finish and sealing land decide cap performance. Precision mold machining holds the thread and the land flat, so the cap compresses evenly. A dirty or short-shot neck seat is the most common leak source, and it is caught by the neck camera or gauge on the line.
In-line leak testing uses pressure decay: the empty jerrycan is sealed, pressurized, and monitored for drop over a few seconds. Any part outside the limit is rejected before packing. For edible liquids, 100 percent testing is practical at 6L line speeds and strongly recommended for cooking oil and vinegar.
Finally, clean cooling and consistent demold protect the sealing face from dust and deformation. A small particle on the land or a warped neck ruins an otherwise perfect container, so housekeeping and mold maintenance matter as much as the process window.
EBM vs Alternative Processes for Jerrycans
Buyers sometimes ask whether injection blow molding or injection stretch blow molding could replace EBM for a 6L jerrycan. The comparison below shows why EBM stays the right route for handled edible-liquid containers in this size.
| Criterion | EBM (Apollo ABLB) | IBM | ISBM |
|---|---|---|---|
| Handle integration | Yes, in one shot | Limited | No |
| Container size | 200 mL to 20 L | 3 mL to 1 L | Up to 20 L |
| Material fit | HDPE, PP, PVC | PE, PP, PS | PET, PP |
| Tooling cost | Medium | High | High |
| Wall control | Programmable | Good | Excellent |
| Mixed production | Fast mold change | Slower | Slower |
EBM wins on handle integration and size range for the 6L jerrycan. IBM and ISBM excel at small, high-clarity bottles and tight necks, not at handled 6L edible containers. For cooking oil and vinegar, the handled rectangular jerrycan is exactly the EBM sweet spot.
The trade-off is surface finish: EBM parts carry a parting line and flash that must be removed, while IBM and ISBM can deliver flash-free necks. Apollo’s automatic deflash and neck trim close most of that gap for edible-liquid service, keeping the container clean and the cap seat true.
Selection Guide: Requirement to Model
The right machine depends on your SKU mix, volume, and compliance needs. The table maps common 6L edible-liquid requirements to the Apollo configuration that fits, so buyers can shortlist before requesting a detailed quote.
| Requirement | Recommended Apollo model | Reason |
|---|---|---|
| Mixed cooking oil and vinegar, frequent change | ABLB Series double station | Fast mold change, recipe storage |
| Single 6L SKU, high volume | ABLB multi-cavity | Higher output per hour |
| Low energy, no hydraulics | Fully Electric Series 6L | Electric drive, clean plant |
| Future 20L to 1500L drums | ABLD Series | Large-container range |
| Hot-filled vinegar above 80 C | ABLB with PP grade | PP heat resistance |
For most mixed edible-liquid plants, the ABLB Series double station is the starting point. It covers the 6L cooking oil and vinegar jerrycan today and scales to nearby sizes as the range grows. The Fully Electric Series answers plants with strict energy or cleanliness rules.
If the business already ships 20L drums or plans to, the ABLD Series shares the same Apollo engineering and service, so training and spare parts stay common. That commonality lowers lifetime cost across a mixed container portfolio.
Application Industries Served by Apollo
Apollo’s extrusion blow molding machines serve food and beverage, daily chemical, chemical, building material, medical, automotive, and transport segments. The 6L jerrycan line sits at the intersection of food and daily chemical, where cooking oil and vinegar are everyday examples.
In food and beverage, beyond edible oil and vinegar, the same ABLB platform runs soy sauce, syrup, and honey containers where HDPE and a clean neck protect taste. Daily chemical plants use it for detergent and disinfectant jerrycans that demand the same leak-proof discipline.
The chemical industry values EBM for aggressive liquids, because HDPE and PP resist a wide range of acids and solvents. Building material and automotive uses include AdBlue, washer fluid, and lubricant cans that share the 6L to 20L architecture. This breadth means one Apollo line can serve several departments or customers.
Medical and pharmaceutical grade containers are possible with validated materials and clean rooms, showing how far the ABLB platform reaches when compliance steps up. For cooking oil and vinegar, the food-contact grade and in-line leak test already meet the practical bar most buyers need.
Service and サポート Commitments
Apollo, as a Wanplas factory, backs every line with the group’s shared promises. Before shipment, each machine passes factory acceptance testing that runs the target jerrycan and confirms output, wall, and seal. Engineers then travel to the customer site for installation and commissioning.
The Wanplas group supplies USD 500 free spare parts per year, so routine wear items do not stop a running line. Warranty covers defective parts with free replacement, and the transportation guarantee protects the machine in transit. Production capacity is guaranteed against the agreed specification.
Training covers operation, mold change, and basic maintenance, so the customer team owns the changeover skill. Remote monitoring lets Apollo engineers read PLC data and spot drift before it becomes scrap. The open-factory policy welcomes visits to see the line run and to approve molds in person.
Quality standards carry a clear promise: if the machine fails to meet the agreed quality, the customer receives a refund plus 10 percent compensation. That commitment sits behind every 6L fast mold change EBM line Apollo ships for cooking oil and vinegar production.
Defect Prevention for Edible Jerrycans
Even a well-set 6L EBM line can drift, and edible jerrycans expose defects quickly because oil and vinegar reveal thin walls and weak necks. A short defect checklist keeps the cooking oil and vinegar run stable and protects the food-contact claim through a long production week.
| Defect | Likely cause | Prevention on ABLB |
|---|---|---|
| Thin handle root | Wrong parison profile | Shift wall into handle via programmer |
| Neck flash | Mold parting dirty | Auto deflash and clean air |
| Warped body | Early demold | Lengthen cooling, lower mold temp |
| Weep at seam | Low blow pressure | Raise to 0.6 to 1.0 MPa |
| Off-taste | Contaminated stream | Dedicated food-grade HDPE line |
Warped bodies usually trace to cooling that ended before the wall set, so the part springs when ejected. Lowering mold temperature and extending cooling time restores shape without slowing the line much, because the 6L cycle already carries a healthy cooling window. The parison programmer should also keep the body lean rather than over-thick, since excess wall only lengthens cooling for no gain.
Neck flash is the enemy of a square cap, and on edible cans it also traps product residue that later weeps. Apollo’s automatic deflash trims the neck and parting line every cycle, and the leak tester rejects any can whose land is not true. Keeping the mold and the shop air clean stops flash from returning after a long run of cooking oil or vinegar jerrycans.
Off-taste and odor complaints point to material hygiene rather than machine drift. Running cooking oil and vinegar on a dedicated, food-grade HDPE stream, with the resin certificate on file, removes most taste risks. The ABLB recipe store also prevents a wrong setpoint from sending a soft-wall can downstream, because each product reloads its own verified parameters on changeover.
Pigmentation and UV stability also matter for edible jerrycans stored in light. A small masterbatch dose gives shelf appeal without harming melt flow, and a UV stabilizer protects oil from light-induced rancidity during long retail display. Apollo recommends confirming additive food-contact status with the supplier before running any colored or stabilized grade.
Frequently Asked Questions
What is extrusion blow molding and how does it make a jerrycan?
Extrusion blow molding extrudes a molten plastic tube called a parison from a die head, captures it between two mold halves, and inflates it with compressed air into the cavity shape. The cooled part is ejected as a finished hollow container such as a 6L jerrycan.
Can one EBM machine produce both cooking oil and vinegar jerrycans?
Yes. With a fast mold change system and recipe storage, the same ABLB Series line switches between cooking oil and vinegar jerrycan molds in minutes. Both products use food-contact HDPE, so material handling stays consistent.
How fast is a mold changeover on the ABLB fast-change line?
A standardized mold base with hydraulic clamp and quick couplings typically completes a full changeover in 15 to 30 minutes. Recipe parameters reload automatically, removing manual setpoint re-entry.
Which plastic is best for edible oil and vinegar containers?
Blow molding grade HDPE is the standard choice for cooking oil and vinegar jerrycans. It resists oil penetration and acetic acid, meets FDA and EU 10/2011 food-contact rules, and provides the impact strength needed for handled containers.
How does the machine guarantee a leak-proof seal?
Leak resistance comes from programmed parison wall thickness, a clean neck finish, and in-line pressure-decay leak testing. The sealing land and cap thread are held to tight tolerances by precision mold machining.
What output can a 6L EBM line deliver?
A single-cavity 6L line typically yields 110 to 150 containers per hour. Double-station and multi-cavity configurations raise output substantially for steady single-SKU runs.
Does Apollo provide on-site installation and training?
Yes. Apollo dispatches engineers for installation and commissioning, runs factory acceptance testing, and trains operators. The Wanplas group also supplies USD 500 free spare parts per year.
Is the ABLB line suitable for food-contact compliance?
Yes. When paired with compliant HDPE and clean production practice, ABLB containers meet FDA and EU 10/2011 food-contact requirements. Formal compliance depends on the resin certificate and local registration.
Conclusion
A 6L fast mold change EBM machine lets one Apollo ABLB Series line serve cooking oil and vinegar jerrycans through quick mold swaps and stored recipes. HDPE grade selection, parison programming, and in-line leak testing keep every container food-contact safe and leak-proof. Apollo, a Wanplas factory, supports the line with testing, installation, USD 500 free spare parts per year, and a quality refund promise. Send your jerrycan drawing and daily volume to receive a tailored configuration, arrange a factory visit, and book a sample trial run on the target mold.
