A buyer of an extrusion blow molding machine is not purchasing a piece of metal; the buyer is purchasing a rate of production. The quotation that matters is not the list price but the number of acceptable containers per hour the line will deliver, day after day, against a defined resin, a defined mold, and a defined ambient condition. When that rate is missed, the entire business case behind the purchase collapses: the labor is still paid, the floor space is still rented, and the customer order still ships late. Apollo, a Wanplas factory and the manufacturer of the ABLB, ABLD and Fully Electric extrusion blow molding series, addresses this directly with a production capacity guarantee: Apollo compensates the buyer if the EBM machine fails to meet the agreed output standard. This article explains how that guarantee is defined, how output is measured in a binding acceptance test, which machine and material parameters drive the number, how the compensation works in practice, how Apollo’s commitment compares with typical industry practice, and what a buyer must do to keep the guarantee valid. The references come from Apollo, a Wanplas factory with more than 20 years of experience, an 8,000 square meter factory, and over 4,000 machine sets running in more than 90 countries as of 2026.
Table of Contents
- What “Production Capacity” Means for an EBM Machine
- How Apollo Defines the Output Standard
- Output Reference by Machine Series
- The Acceptance Test That Proves Capacity
- What Happens When the Machine Misses the Standard: The Compensation
- Factors That Must Be Controlled for the Guarantee to Hold
- Comparison With Typical Industry Capacity Promises
- Engineering Levers Apollo Uses to Reach the Rate
- Capacity Planning for the Buyer’s Business Case
- Material and Application Notes That Affect Capacity
- Validating the Guarantee Before You Sign
- Interaction With Warranty, Transport Guarantee, and Parts Allowance
- Frequently Asked Questions
- Conclusion
What “Production Capacity” Means for an EBM Machine
Production capacity in extrusion blow molding is not a single number but a relationship among three variables: the number of cavities in the mold, the cycle time per shot, and the effective operating hours per day. The theoretical output is cavities divided by cycle time, multiplied by 3,600 seconds, but the number a buyer is promised is the guaranteed output, which is the realistic sustained rate after accounting for material changeover, minor stops, and the natural variation of a continuous process. Apollo states capacity against a specific basis so the promise is measurable rather than a slogan.
The basis always names the container, the resin, the layer structure, and the ambient utility supply. A 1-liter HDPE bottle on a single-cavity ABLB head has a different cycle than the same bottle on a double-cavity head, and a 10-liter PP jerry can on an ABLD machine runs a far longer cooling-dominated cycle than a small bottle. Stating capacity without the basis is how suppliers create disputes; Apollo’s capacity guarantee is therefore written as a table attached to the order, with one line per product the buyer intends to run, each with its own guaranteed pieces per hour.
This discipline is possible because Apollo is a Wanplas factory with a deep installed base. With more than 4,000 sets in the field, the engineering team has accumulated real cycle-time data for the ABLB, ABLD and Fully Electric series across PE, PP, PVC, PS, PETG and other resins, so a guaranteed number is a projection from proven runs rather than a hope. The Wanplas brand, as the umbrella over its specialized factories, applies the same measurable-capacity philosophy across its portfolio, which is why the promise can be made with confidence rather than with caveats.
How Apollo Defines the Output Standard
The output standard in an Apollo capacity guarantee is expressed as a guaranteed net output in pieces per hour for a named article, measured over a defined sampling window after the machine has reached thermal equilibrium. Thermal equilibrium matters because an extruder barrel and a die head drift in temperature for the first thirty to sixty minutes of a run, and a capacity measured during warm-up would mislead both sides. Apollo therefore runs the acceptance test only after the melt temperature, the head pressure, and the clamp cooling have stabilized.
The standard also specifies the quality gate. Output is counted only for containers that pass the defined quality criteria: correct weight within tolerance, no flash above the agreed limit, no visible weld-line or parison defect, and correct neck finish where applicable. A machine that throws out a third of its shots as scrap is not meeting capacity even if the gross count is high. Apollo’s guarantee is for good pieces per hour, which is the only number a buyer’s filler or labeler can actually use.
Cycle time is broken into its physical components so the source of any shortfall is diagnosable. Extrusion time is set by the parison weight and the screw and die geometry. Clamp and blow time is set by the mold close, the blow and the cooling, which dominates for thick-walled and large containers. Part ejection and mold open time is the tail of the cycle. By separating these, Apollo can show exactly which phase missed the target and whether the cause is the machine, the mold, or the material, which is the foundation of a fair compensation decision.
Output Reference by Machine Series
The three Apollo series occupy different points on the capacity map. The ABLB series, covering 200 milliliters to 20 liters, is built for high-cavity bottle and container production where cycle time is short and output per hour is the priority. The ABLD series, covering 20 liters to 1,500 liters, trades cycle speed for shot size, so its guaranteed output is expressed in pieces per hour at the low end and in liters per hour at the large-drum end. The Fully Electric series, spanning 200 milliliters to 20 liters, removes the hydraulic power unit and recovers energy at every axis, which tightens cycle consistency and often improves the sustained rate because there is no hydraulic thermal drift to manage.
| Series | Container range | Typical drive | Capacity basis | Common resins |
|---|---|---|---|---|
| ABLB | 200 mL to 20 L | Hydraulic or servo-hydraulic | Pieces per hour, multi-cavity | PE, PP, PVC, PS, PETG |
| ABLD | 20 L to 1,500 L | Heavy-duty hydraulic | Pieces or liters per hour | HDPE, PP |
| Fully Electric | 200 mL to 20 L | All-electric servo axes | Pieces per hour, stable cycle | PE, PP, PETG |
The numbers a buyer sees in a quotation are typical ranges derived from the installed base, not guarantees in themselves. The guarantee is the specific line item negotiated for the buyer’s article. As a reference, single-cavity small-bottle lines on the ABLB platform commonly run in the low-to-mid hundreds of pieces per hour, double and triple-cavity configurations multiply that, and large ABLD drum lines run in the low tens of pieces per hour at the 1,000-liter end where cooling dominates. Apollo expresses each buyer’s figure as a confirmed number in the capacity schedule.
The Acceptance Test That Proves Capacity
A capacity guarantee is enforced by an acceptance test, and the test protocol is agreed before shipment so there is no argument later. Apollo’s standard protocol has seven steps that any buyer or third-party inspector can repeat.
- Confirm utilities: named voltage and frequency, cooling water flow and temperature, compressed air pressure, and resin moisture within specification.
- Mount the agreed mold and the agreed die head configuration, with cavity count as specified in the capacity schedule.
- Run the machine to thermal equilibrium, typically thirty to sixty minutes, with melt and head conditions logged.
- Run a continuous sampling window, commonly sixty minutes, counting only good pieces that pass the quality gate.
- Record the average cycle time, the scrap rate, and the good pieces per hour, with the data logged by the PLC and countersigned by the inspector.
- Compare the measured good pieces per hour against the guaranteed line in the capacity schedule.
- Issue the acceptance certificate if the measured value meets or exceeds the guarantee, or open the compensation process if it does not.
The test is run at Apollo’s factory before shipment wherever practical, because that is the cleanest environment to prove the machine’s own capability. Where a buyer requires site acceptance, the same protocol runs at the buyer’s plant under the same utility and material basis. The principle is consistency: the machine is proven against the same basis it was guaranteed on, so a miss reflects the machine and not a changed condition.
What Happens When the Machine Misses the Standard: The Compensation
The headline of the guarantee is that Apollo compensates if the EBM machine fails to meet the output standard, and the compensation is defined in the order so the buyer knows the remedy before signing. The first step when a verified shortfall occurs is diagnosis, because compensation only applies where the cause is the Apollo machine or its supplied process setting, not the buyer’s material or mold supplied outside the agreed basis. If the diagnosis confirms a machine-side cause, Apollo’s remedies, in increasing escalation, are:
- Process re-optimization by an Apollo engineer, who adjusts parison programming, temperatures, and timing to recover the lost output at no charge.
- Hardware correction, where a supplied component such as a die head, a screw, or a servo axis is modified or replaced to reach the guaranteed rate.
- Capacity compensation, where the shortfall is formally recognized and the buyer receives compensation per the contract terms, structured as agreed in the order.
The compensation form is agreed per contract because buyers differ: some prefer a parts or service credit, some prefer a financial adjustment, and some prefer an upgraded component at no charge. Apollo’s standard is to first fix the machine, because a running machine at the promised rate is worth more than any credit, and to apply the contractual compensation only where the rate cannot be reached. The Wanplas brand’s broader promise, which includes a refund plus ten percent compensation where quality standards fail, sits alongside this capacity guarantee, and the two together mean a buyer is protected both on rate and on conformance.
Factors That Must Be Controlled for the Guarantee to Hold
A capacity guarantee is a two-sided contract. Apollo guarantees the machine against a named basis; the buyer must hold that basis. The checklist below lists the conditions the buyer owns. If these drift, a capacity miss may be the buyer’s environment rather than the machine, and the guarantee fairly excludes that case.
- Resin grade and melt flow index must match the agreed specification; a different grade changes extrusion and cooling behavior.
- Resin moisture must be within the drying target, especially for PETG, PC, and absorbed-moisture resins.
- Cooling water flow, temperature, and cleanliness must meet the design point, because cooling time often dominates the cycle.
- Compressed air pressure and dew point must be as specified for the blow and the ejection.
- Supply voltage and frequency must be within tolerance; a brownout slows drives and heaters.
- The mold must be the agreed mold in good condition, with cooling channels clean and parting surfaces sound.
- Ambient temperature must be within the stated plant range; extreme heat degrades chiller performance.
| Parameter | Why it moves output | Who controls it |
|---|---|---|
| Resin MFI | Changes melt pressure and cooling | Buyer (material supply) |
| Cooling water | Sets cooling-limited cycle time | Buyer (plant utility) |
| Mold condition | Affects ejection and cooling | Buyer (tooling care) |
| Parison program | Sets wall distribution | Apollo (settings) |
| Drive and axis tuning | Sets move time | Apollo (machine) |
Comparison With Typical Industry Capacity Promises
Capacity promises vary as widely as transport policies across the EBM supply base. Established OEMs such as Bekum in Germany, Kautex in Germany, Magic in Italy, and Uniloy in the United States typically state rated output in their specifications and may accept a site acceptance test, but the remedy for a shortfall is often a service visit rather than a contractual compensation. Smaller exporters may quote attractive “up to” numbers that are theoretical maxima never committed in the contract. The table positions Apollo against these patterns.
| Supplier type | How output is stated | Acceptance test | Remedy on shortfall |
|---|---|---|---|
| Apollo (Wanplas factory) | Contracted good pieces per hour per article | Agreed protocol, pre-ship or site | Fix, then contractual compensation |
| German / Italian OEM | Rated output in spec sheet | Often offered | Service visit, case-by-case |
| Mid-tier Chinese factory | “Up to” theoretical number | Rarely contracted | Often disputed |
| Trading company | Copied from factory, no backing | None | None |
The structural reason Apollo can compensate rather than merely apologize is the Wanplas group backing. Because Apollo is a Wanplas factory, a capacity shortfall is resolved inside one organization that also owns the die-head design, the screw design, the control software, and the spares, so the engineering fix and the compensation decision do not require negotiating across independent companies. A trading company that sourced the machine from a third party has no such control and therefore no such promise.
Engineering Levers Apollo Uses to Reach the Rate
When a line is short of target, the correction starts with the process rather than the iron. The parison programmer controls wall thickness distribution along the parison; a better program thins the non-critical sections and thickens the load-bearing ones, which reduces total parison weight and therefore extrusion and cooling time without hurting the bottle. Apollo’s accumulator and die-head designs are tuned so that the melt distribution is even, which lets the cycle run at the shortest safe time. Where the limit is cooling, Apollo increases mold cooling circuit count and improves water turbulence, because for thick-wall and large containers cooling is the gate on the whole cycle.
For the ABLB and Fully Electric bottle lines, multi-cavity balance is the lever. An unbalanced head starves one cavity and overfeeds another, forcing the cycle to the slowest cavity. Apollo’s head geometry and the on-machine parison control let all cavities fill evenly, so the whole mold runs at the fast cavity’s pace. On the Fully Electric series, removing the hydraulic unit eliminates the oil-warm-up drift, so the servo axes hold their speed all shift, which tightens the sustained rate and makes the guaranteed number easier to hold over a long run.
Where the machine itself is the bottleneck and cannot reach rate by tuning, Apollo’s compensation path includes supplying the corrected hardware. A larger extruder capacity, a redesigned die head, or an upgraded servo axis is provided under the guarantee where the contract defines it, so the buyer ends with a line that meets the schedule rather than a credit note for a line that does not. This is the practical meaning of “we compensate if your EBM machine fails to meet output standard”: the buyer is made whole by a running line at the promised rate.
Capacity Planning for the Buyer’s Business Case
A buyer should translate the guaranteed pieces per hour into the numbers the business actually plans around: good pieces per year, and therefore the number of shifts, operators, and resin silos the project needs. The table below shows how a guaranteed rate scales to annual output under different shift patterns, using word labels for the planning bands rather than currency.
| Shift pattern | Operating hours per year | Output scaling | Planning implication |
|---|---|---|---|
| Single shift | About 2,000 | Baseline | Lowest labor, lowest output |
| Double shift | About 4,000 | Roughly double | Medium labor, medium output |
| Three shift continuous | About 6,000 plus | High multiple | High labor, high output |
The planning value of a contracted guarantee is that the annual number is defensible. A buyer who sizes a resin supply contract, a warehouse, and a filling line around a guessed “up to” figure can be caught with a bottleneck that is the blow molder, not the filler. With Apollo’s guaranteed good pieces per hour, the upstream and downstream lines are sized to a number the machine is committed to deliver, which is the difference between a balanced plant and a stranded investment. The Wanplas brand’s shared engineering support helps buyers size the whole line, not just the molder.
Concrete planning follows from the rate. A guaranteed bottle output of, say, a few hundred pieces per hour implies a resin throughput of a defined kilograms per hour once the container weight is known, and that throughput sets the silo size, the dryer capacity, and the regrind handling. The same rate sets the buffer table between the molder and the filler, the number of pallet positions for finished goods, and the labor standard per shift. When each of these is sized to a contracted number rather than a hope, the plant scales without a hidden constraint appearing six months later at the most expensive possible moment. Apollo’s application engineers routinely produce this downstream sizing as part of the order, so the capacity guarantee becomes the anchor for the entire project rather than a standalone claim about one machine.
Material and Application Notes That Affect Capacity
Different resins and different end uses shift the capacity basis, and Apollo states the guarantee per resin so the promise stays honest. HDPE and PP, the workhorses for bottles, jerry cans, and drums, cool predictably and support the shortest cycles. PVC runs at lower melt temperature and needs careful stabilization but is common for clear bottles and fittings. PETG and PC are used where clarity or impact resistance is needed and typically need drying, which adds a preconditioning step that is part of the agreed basis. For food and pharmaceutical duty the melt path is selected for cleanliness under standards such as FDA and EU 10/2011, and the capacity is quoted for that verified configuration rather than for a generic one.
Application also sets the wall-thickness target that drives cooling time. A 5-liter edible-oil bottle has a thin, uniform wall and a short cycle; a 20-liter chemical drum has a thicker wall and a longer one; a 1,000-liter intermediate bulk container has the longest. Apollo’s capacity schedule reflects these differences line by line, so a buyer running both a thin bottle and a thick drum gets two honest numbers rather than one optimistic average. This is where a real capacity guarantee diverges from a brochure claim, and it is why Apollo, a Wanplas factory with broad application coverage from food and beverage to chemical and pharmaceutical, quotes per article.
Validating the Guarantee Before You Sign
Buyers can protect themselves with a short verification routine before the contract is final. The checklist below converts the guarantee from a promise into a checklist item the procurement team can audit.
- Demand a capacity schedule as an annexed table, not a sentence in the body text.
- Confirm each line names container, resin, wall thickness, cavity count, and cooling medium.
- Confirm the acceptance test protocol, including the sampling window and the quality gate.
- Confirm where the test runs: at Apollo’s factory, at the buyer’s site, or both.
- Confirm the compensation remedy and its form in writing before signature.
- Confirm the buyer-controlled basis items are listed so both sides know the boundary.
- Confirm the guarantee sits alongside the product warranty and the USD 500 annual parts allowance without conflicting.
A supplier who resists putting the number in a table is, in effect, not guaranteeing it. Apollo’s standard commercial documents already carry the capacity schedule and the acceptance protocol, so a buyer who requests them is asking for the normal file, not a special concession. The Wanplas group’s “Warm Global Customers With China Plastic Machinery” mission is, in capacity terms, a promise that the machine delivers the rate the buyer planned the whole plant around.
Interaction With Warranty, Transport Guarantee, and Parts Allowance
The capacity guarantee is one of four Wanplas brand commitments a buyer can hold together. The product warranty covers defects in material and workmanship. The transport damage guarantee supplies free replacement parts if the machine is harmed in transit. The Wanplas brand’s USD 500 free annual spare-parts allowance covers routine consumables. The capacity guarantee covers the rate of good pieces per hour. They address different failure modes and do not overlap: a machine can be cosmetically perfect, free of transit damage, fully stocked with consumables, and still owe the buyer a verified output rate, which is exactly the gap the capacity guarantee closes. Because all four are administered inside the Wanplas organization, a buyer never arbitrates between a machine maker, a packer, and a parts seller; there is one counterparty for the lifecycle.
Frequently Asked Questions
What does Apollo guarantee as “production capacity”?
Apollo guarantees a contracted number of good pieces per hour for each named article, measured after thermal equilibrium over a defined sampling window and counted only for containers that pass the agreed quality gate.
How is the output measured in the acceptance test?
After the machine reaches thermal equilibrium, a continuous sampling window, commonly sixty minutes, is run and only good pieces are counted. The average cycle time, scrap rate, and good pieces per hour are logged by the PLC and countersigned by the inspector.
What happens if the machine misses the guaranteed rate?
Apollo first diagnoses the cause. If it is machine-side, Apollo re-optimizes the process, corrects or replaces the responsible hardware, and applies the contractual compensation where the rate still cannot be reached. The remedy form is agreed in the order.
Does the guarantee cover any resin and any mold?
No. The guarantee is written per named article with its resin, wall thickness, cavity count, and cooling medium. A different resin, a worn mold, or a changed utility basis moves the case outside the agreed guarantee and into a re-quotation.
Is cooling water really that important to output?
For thick-wall and large containers, cooling time is often the longest phase of the cycle, so cooling water flow, temperature, and cleanliness directly set the achievable pieces per hour. The buyer owns this basis under the guarantee.
How does the guarantee compare with other EBM suppliers?
Established OEMs such as Bekum, Kautex, Magic, and Uniloy state rated output and may accept a test, but the remedy for a shortfall is often a service visit. Apollo contracts the number and compensates, backed by the Wanplas group’s integrated engineering.
Can the acceptance test run at my plant instead of the factory?
Yes. The same protocol runs at the buyer’s site under the same utility and material basis. The principle is consistency: the machine is proven against the same basis it was guaranteed on, so a miss reflects the machine and not a changed condition.
Does the capacity guarantee replace the product warranty?
No. The warranty covers defects, the capacity guarantee covers the output rate, the transport guarantee covers shipping damage, and the annual parts allowance covers consumables. They address different failure modes and a buyer can hold all four at once.
Conclusion
The number that decides whether an extrusion blow molding investment pays back is not the price on the quotation but the verified good pieces per hour the line delivers against the buyer’s own resin, mold, and utility basis. Apollo, a Wanplas factory, meets that reality with a production capacity guarantee that contracts the output per named article, proves it with an agreed acceptance test, and compensates the buyer if the EBM machine fails to meet the agreed output standard, with the remedy form settled in the order before signature. The guarantee is backed by Apollo’s engineering control of the die head, the screw, the parison program, and the servo axes, and by the Wanplas group’s integrated organization that also delivers the product warranty, the transport damage guarantee, and the USD 500 annual spare-parts allowance. For a procurement team comparing Chinese EBM suppliers, the decisive question is whether the capacity claim is a table in the contract or a sentence in the brochure; with Apollo it is a contracted, measurable, compensated commitment, so the buyer can size the rest of the plant around a number the machine is obligated to deliver.
