GEAR APPLICATION GUIDE · SPUR GEAR · S06

Spur Gears for Packaging Equipment:
Drive Design, Hygiene Standards and Speed Synchronisation

Packaging equipment spur gears serve two distinct masters simultaneously — mechanical precision and regulatory hygiene. Whether driving a high-speed carton erector, indexing a bottle-filling carousel, or synchronising the film feed of a horizontal flow wrapper, spur gears in packaging lines must deliver repeatable angular position, maintain output speed constancy across variable product loads, and in food and pharmaceutical applications, comply with FDA 21 CFR, EU 1935/2004, and NSF standards. This comprehensive guide covers spur gear material selection, quality class, backlash control, NSF H1 lubrication, stainless housing design, and speed-synchronisation requirements for the full spectrum of industrial and hygienic packaging equipment drives.

20CrMnTi · 316L · C45 · NSF H1
M1.5–M8 · DIN 5–8 · IP67 · FDA 21 CFR
Flow Wrapper · Filler · Carton · Pharma

MODULE RANGE

M1.5 – M8

Packaging equipment spur gears span a wide module range. Pharma blister feeder: M1.5–M2. FFS film drive: M2–M4. Carton erector indexer: M3–M5. Heavy case packer conveyor: M5–M8

QUALITY CLASS

DIN 5 – 8

DIN 5–6 for high-speed index drives and servo-synchronised film feeds. DIN 7 for standard carton and case conveyor gears. DIN 8 for heavy product-handling drives below 3 m/s pitch line velocity

HYGIENIC RATING

NSF H1 / IP67

NSF H1 food-grade lubricant and IP67 housing sealing are the minimum requirements for spur gear drives on food and pharmaceutical packaging lines subject to CIP washdown with NaOH and peracetic acid cleaning agents

LINE SPEED

50–1,200 ppm

Packaging equipment spur gear drives are specified from slow 50 ppm cosmetic and luxury goods lines through to 1,200 ppm beverage capping and labelling lines. Speed synchronisation accuracy requirement increases with line speed

Why Spur Gears Are the Standard Choice for Packaging Equipment Drive Trains

The packaging machinery industry has converged on spur gears as the dominant gear type for the vast majority of within-machine drive trains for three reasons that no alternative gear type can match simultaneously: absolute phase repeatability (a spur gear mesh maintains a fixed angular relationship between driver and driven shaft across millions of cycles, making it ideal for register-critical packaging operations), compact inline geometry (the zero helix angle eliminates axial thrust loads that would require larger, more complex bearing arrangements in the constrained space of a packaging machine frame), and straightforward replacement (spur gear tooth form inspection and cross-referencing does not require specialised spiral bevel or worm gear measurement tools, allowing maintenance engineers to specify and verify replacement gears rapidly during a production shutdown).

Korea Ever-Power’s spur gears for packaging equipment are manufactured across the full range of packaging industry material requirements — 20CrMnTi case carburized for high-speed servo-synchronised index drives and film feed gears, C45 induction hardened for medium-duty carton and case conveyor drives, and 316L stainless for hygienic packaging applications subject to daily CIP washdown. The production programme includes both standard DIN metric module spur gears (M1.5 through M8) and non-standard pitch packaging machine gears manufactured to the dimensional specification of existing OEM gears — including inch diametral pitch gears for packaging equipment originally built to North American standards.

Forging Spur Gear

Speed synchronisation between adjacent packaging machine sections is the most critical performance parameter that packaging equipment spur gears must maintain. A horizontal flow wrapper with film feed speed mismatched to the product conveyor speed by more than 0.5% produces continuous pack defects — loose packs downstream of the seal jaw, tight packs that distort the product upstream. This synchronisation is achieved through a combination of spur gear ratio accuracy (which sets the nominal speed relationship), gear quality class (which limits the transmission error that causes cyclic speed variation), and backlash control (which determines the dead band when the drive direction reverses between push and pull phases of the film forming cycle). Korea Ever-Power packaging machine spur gears are available with measured and certified backlash for servo-synchronised drive applications.

20CrMnTi Case Carburized

The standard material for high-speed packaging equipment spur gears requiring maximum fatigue life and wear resistance. Case carburized to effective case depth 0.5–0.9 mm (module-dependent), HRC 58–62 tooth surface, ductile core HB 280–320. Used for film feed gears in FFS machines, index drive gears in carton erectors, and conveyor synchronisation gears on high-speed beverage and dairy packaging lines operating above 300 ppm. Shot peened tooth roots improve bending fatigue life by 20–25% under the cyclic acceleration and deceleration loads of servo-driven packaging indexers.

Best for: servo index drives, film feed, >300 ppm lines

C45 Induction Hardened

The cost-effective choice for medium-duty packaging equipment spur gears — carton conveyor gears, case packer product handling drives, and labelling machine label feed drives. Induction hardened to HRC 48–54 at the tooth surface, normalised core HB 180–210. Annual replacement is economically practical for many packaging line gears, making the lower first cost of C45 more attractive than the extended life of 20CrMnTi. Not suitable for food and pharmaceutical packaging lines requiring 316L material or NSF H1 hygienic design — C45 corrodes rapidly in CIP washdown environments.

Best for: carton conveyor, case packer, <200 ppm non-food

316L Stainless Steel

Mandatory for food, beverage, dairy, and pharmaceutical packaging equipment spur gears subject to product splash, CIP washdown at 80°C with NaOH and peracetic acid, or regulatory inspection under FDA 21 CFR Part 110 (food) or EU GMP (pharmaceutical). 316L stainless is austenitic and cannot be case carburized — maximum hardness HB 200 in the hobbed condition, or nitrided to approximately HV 900 in the tooth surface. Load capacity is lower than carburized steel, but adequate for the light-to-medium duty of most hygienic packaging drives. Paired with NSF H1 PAO lubricant and PTFE or EPDM shaft seals.

Best for: food, dairy, pharma, CIP washdown applications

Packaging Machine Application Drive Specifications

steel spur gear packaging machine drive Korea Ever-Power — Korea Ever-Power 20CrMnTi case carburized spur gear for packaging machine synchronisation drive — M3, 48 teeth, bore 25 mm H7, key 8×7, DIN 6 quality class, HRC 60–62 tooth surface, case depth 0.6–0.9 mm. Tip relief 5 μm applied to reduce mesh entry impact under servo acceleration. Backlash measured and certified at 0.04–0.06 mm at specified centre distance. Shot peened tooth root. Used in horizontal FFS flow wrapper film feed synchronisation and carton erector index drive applications at speeds up to 600 ppm.

PACKAGING MACHINE TYPE	MODULE	MATERIAL	DIN	BACKLASH	HYGIENIC
Horizontal FFS flow wrapper (film feed)	M2–M4	20CrMnTi	DIN 5–6	<0.05 mm	NSF H1 if food
Vertical FFS form-fill-seal (VFFS)	M2–M3	20CrMnTi/316L	DIN 6–7	<0.06 mm	IP67 + NSF H1
Carton erector / case former	M3–M5	C45 / 20CrMnTi	DIN 7	<0.10 mm	Not required
Bottle filler / capper (rotary)	M3–M6	316L / 20CrMnTi	DIN 6–7	<0.06 mm	NSF H1 / IP67
Labelling machine (self-adhesive)	M1.5–M3	C45 / 20CrMnTi	DIN 6–7	<0.05 mm	If food label
Pharmaceutical blister packer	M1.5–M2.5	20CrMnTi / 316L	DIN 5–6	<0.04 mm	EU GMP / USP
Heavy case packer / palletiser	M5–M8	C45 / 20CrMnTi	DIN 7–8	<0.15 mm	Not required

Korea Ever-Power gear manufacturing workshop packaging spur gear production — Korea Ever-Power precision gear manufacturing facility — CNC gear hobbing, profile grinding, and quality measurement equipment for packaging equipment spur gear production. All packaging machine spur gears are manufactured under ISO 9001:2015 quality system with 100% tooth profile inspection on precision CMM equipment. Production range M1.5–M20, module step 0.5, DIN quality class 4–9, annual capacity over 500,000 spur gears across all packaging industry material grades.

Hygienic Design for Food and Pharmaceutical Packaging Spur Gear Drives

The hygienic design of spur gear drives for food and pharmaceutical packaging equipment has evolved significantly since the original EU Machinery Directive requirements were supplemented by EHEDG (European Hygienic Engineering and Design Group) guidelines and the FSMA (Food Safety Modernization Act) requirements in North America. The current state of the art for food packaging line spur gear drives encompasses material selection, surface finish, lubricant compliance, sealing design, and drainage — all of which must be addressed simultaneously to achieve EHEDG-certified hygienic design for direct or incidental food contact zones.

A common misconception in food packaging plant specification is that 316L stainless spur gears are inherently hygienic. The gear material alone is necessary but not sufficient — a 316L stainless spur gear in a cast iron gearbox housing with standard nitrile rubber shaft seals and mineral gear oil is not EHEDG-compliant, because the housing material, lubricant, and seals all have direct or indirect food contact risk. Korea Ever-Power’s hygienic packaging spur gear drive specification addresses all four elements: 316L stainless gear set, electropolished aluminium or 316L stainless housing (Ra ≤ 0.8 μm), NSF H1 synthetic PAO lubricant, and EPDM or PTFE shaft seals rated for CIP chemical resistance at 85°C.

HYGIENIC PACKAGING SPUR GEAR DRIVE — COMPLIANCE CHECKLIST

GEAR MATERIAL

✓ 316L stainless (preferred for washdown zones)
✓ 20CrMnTi with sealed enclosed housing (acceptable for splash zones)
✗ C45 carbon steel (not acceptable in any food contact zone)
✗ Cast iron (not acceptable — corrosion risk)

LUBRICANT

✓ NSF H1 registered gear oil (Klüber Summit WF, Castrol Tribol GL)
✓ Change interval 2,000–4,000 h or annually
✗ Mineral gear oil (not NSF H1 compliant)
✗ EP gear oil with amine additives (not food-grade)

SEALING / HOUSING

✓ IP67 minimum; IP69K for high-pressure washdown
✓ EPDM or PTFE shaft seals for CIP compatibility
✓ Sloped housing surfaces for drainage, no horizontal ledges
✓ Electropolished 316L housing Ra ≤ 0.8 μm (EHEDG requirement)

stainless steel spur gear food pharmaceutical packaging Korea Ever-Power — Korea Ever-Power 316L stainless steel spur gear for hygienic food and pharmaceutical packaging equipment — M2, 36 teeth, bore 16 mm H7, electropolished tooth surface Ra ≤ 0.8 μm. Hobbed to DIN 7 quality class. No sharp edges or crevices that would trap food residue or bacteria — all tooth root filii machined to r ≥ 0.4 mm minimum radius as required by EHEDG hygienic design guidelines. Compatible with NSF H1 lubricant and CIP cleaning at 85°C with 2% NaOH and 0.5% peracetic acid. Individual dimensional and surface roughness certificate supplied with each gear order for food safety documentation package.

Backlash Control and Speed Synchronisation in Packaging Line Spur Gear Drives

Backlash in packaging machine spur gears is a primary contributor to pack registration error, particularly in servo-synchronised multi-axis packaging systems where the machine controller attempts to maintain precise angular relationship between independently servo-driven axes connected through spur gear drive trains. The backlash in each spur gear mesh represents a dead band — an angular range through which the output shaft can move without corresponding input shaft movement during direction reversal. In a three-mesh spur gear drive train with 0.08 mm backlash per mesh, the total drive train dead band at the final output shaft can exceed 0.24 mm tooth tangential equivalent — equivalent to a position error of several millimetres at a packaging conveyor pitch diameter of 100 mm.

Modern servo packaging machine controllers include backlash compensation algorithms that command an additional angular offset at each direction reversal, correcting for the known backlash in each axis drive train. Effective backlash compensation requires that the actual backlash is accurately measured and entered into the controller — which requires the gear supplier to measure and certify the backlash of each gear pair at the specified operating centre distance. Korea Ever-Power measures backlash on all packaging machine spur gear pairs ordered for servo drive applications, providing a measurement certificate that allows direct entry into the machine controller’s backlash compensation parameter set.

REDUCING BACKLASH — DESIGN METHODS

→Tight centre distance: holding the gear centre distance to the lower end of the tolerance range reduces backlash to 40–60% of nominal. Requires precise housing bore positioning (±0.03 mm recommended for packaging machine spur gear housings)
→Profile shift (addendum modification): positive profile shift on both pinion and wheel increases tooth thickness, reducing backlash at standard centre distance without changing the pitch diameter relationship. Korea Ever-Power can apply profile shift coefficients per DIN 3992 to reduce backlash by 30–50% in any packaging machine spur gear pair
→Anti-backlash scissor gear: two identical spur gears on the same hub, spring-loaded to push apart angularly, contacting the drive and coast flanks of the mating gear simultaneously. Eliminates backlash entirely at the cost of reduced maximum torque (limited by spring pre-load)
→DIN quality class upgrade: upgrading from DIN 8 to DIN 6 reduces the allowed tooth thickness tolerance band, tightening the achievable backlash range without changing module or centre distance

SPEED SYNCHRONISATION — SPUR GEAR ROLE

→Ratio accuracy: spur gear ratio = tooth count ratio. Tooth count is absolute — no manufacturing variable affects it. The synchronisation ratio of a spur gear drive is therefore exact, unlike belt or chain drives which are subject to slip and elongation
→Transmission error: TE at the mesh frequency superimposes a periodic velocity variation on the ideal ratio. DIN 5–6 quality class limits TE below 5 μrad at packaging speeds — below the threshold that causes visible pack position errors at up to 400 ppm
→Stiffness: spur gears have high torsional stiffness per mesh — typically 2–8 Nm/μrad — providing the rigid speed coupling between synchronised axes that servo controller algorithms rely on to maintain inter-axis phase accuracy
→Replacement traceability: when a spur gear is replaced in a servo-synchronised packaging line, the new gear must be from the same DIN quality class as the original to maintain the transmission error within the range the servo controller was tuned to. Korea Ever-Power supplies replacement packaging gears with the same quality class as the original specified gear

Frequently Asked Questions — Packaging Equipment Spur Gears

Q 01

My horizontal flow wrapper produces random pack lengths that vary by ±3 mm. Could the spur gear drive train be causing this, and how would I identify which gear mesh is the source?

Pack length variation in a horizontal flow wrapper has two possible gear-related causes that produce distinctly different fault signatures. Cyclic variation at the gear mesh frequency — variation that repeats with a period equal to the film feed per tooth mesh event — is caused by high transmission error in the film pull-roll spur gear pair. Diagnose by measuring pack length across a sample of 20 consecutive packs; if the length follows a sinusoidal pattern that repeats every N packs where N corresponds to the film feed per tooth count of the suspected gear, TE is the cause. Random or intermittent variation — packs that are occasionally long or short with no repeating pattern — is caused by intermittent backlash excursion, typically from backlash that has increased through wear and is now above the controller’s programmed compensation value. Diagnose by locking the film pull-roll shaft and measuring output shaft play on the spur gear — if the free play exceeds the original specified backlash by more than 0.03 mm, wear is the cause. Korea Ever-Power can supply matched replacement spur gear pairs with certified TE and backlash for both diagnoses — contact with the wrapper model, film pull-roll gear module, and the observed variation pattern for a specific replacement gear recommendation.

Q 02

Can Korea Ever-Power supply spur gears to fit existing packaging machines from Bosch Packaging, Coesia, IMA, or Multivac without OEM drawings?

Yes — Korea Ever-Power supplies packaging machine spur gear replacements for all major packaging machine OEMs including Bosch Packaging (now Syntegon), Coesia/R.A. Jones, IMA Group, Multivac, Theegarten-Pactec, Marchesini Group, and Uhlmann. Two supply modes are available: (1) Cross-reference from machine model: for machines in Korea Ever-Power’s reference library, provide the machine model number and the gear position designation (from the machine manual BOM or the gear nameplate if it carries one) — Korea Ever-Power identifies the gear from the reference database and quotes from known specification. (2) Measurement-based supply: for machines not in the database, or where the machine manual is unavailable, provide physical measurements of the gear to be replaced: module (calculated from OD and tooth count: Module = OD ÷ (tooth count + 2)), bore diameter, face width, hub length, keyway or spline details, and material (for identification by spark test or hardness measurement). Korea Ever-Power manufactures to these measurements with the same or upgraded material specification. Lead time for catalogue cross-reference gears: 10–18 days. For measurement-based reverse-engineered gears: 18–28 days.

Q 03

What is the correct oil change interval for spur gear drives in packaging equipment, and what are the warning signs that oil needs replacing early?

Standard oil change intervals for packaging equipment spur gear drives: ISO VG 100–150 mineral gear oil in standard carton and case packer drives — change at 3,000 operating hours or annually, whichever comes first. NSF H1 synthetic PAO gear oil in food or pharmaceutical packaging drives — change at 4,000 hours or annually; the superior oxidation stability of PAO extends the effective service life vs mineral oil, but annual change is recommended regardless of hours to maintain food safety documentation currency. Early oil change warning signs: (1) Oil colour change to dark brown or black — thermal oxidation has progressed beyond the additive’s useful life; drain and refill immediately. (2) Milky white oil — water contamination from CIP washdown has emulsified the oil; drain, flush with fresh oil (run 15 minutes no-load, drain), and refill. Water in the oil eliminates the EHL film and causes rapid tooth surface micro-pitting. (3) Metallic particles visible in the drained oil — bronze particles indicate worm wheel wear (if worm stage is present); steel particles indicate spur gear or bearing wear. Drain, inspect all gear surfaces for pitting or scoring, and refill after correcting the cause. (4) Viscosity above 20% of original specification (measured by oil analysis) — indicates contamination or oxidative thickening. For packaging lines with strict food safety management systems, Korea Ever-Power recommends quarterly oil sampling and viscosity measurement as part of the HACCP preventive maintenance programme.

Q 04

How do I correctly specify a spur gear pair for a new packaging machine design to ensure it meets the required speed synchronisation accuracy and service life?

A complete spur gear specification for a new packaging machine drive requires six parameters to be determined in sequence: (1) Ratio and tooth counts: select tooth counts to achieve the exact required speed ratio while using integers — e.g. for ratio 3:1 use 60T/20T not 61T/20T which gives 3.05:1. (2) Module selection: size the module using ISO 6336 tooth bending and contact stress calculation at the rated torque × service factor. Service factor for packaging machine spur gears: 1.0–1.25 for smooth electric motor drive; 1.5–2.0 if a servo axis with high acceleration in the drive train. Typical result: M2–M4 for most packaging drives below 7.5 kW. (3) Quality class: DIN 5–6 if synchronisation accuracy ≤ 0.5% speed variation or backlash ≤ 0.05 mm; DIN 7 for standard conveyor drives where synchronisation is not critical. (4) 材料： 20CrMnTi for drives above 200 ppm or 5 kW; C45 for slower, lower-power drives; 316L for food/pharma zones. (5) Backlash target: specify the maximum allowable backlash at the operating centre distance — for servo-compensated drives: 0.03–0.06 mm; for non-compensated drives: 0.06–0.12 mm. (6) Documentation: for food industry applications, specify: NSF H1 lubricant compatibility, surface finish Ra ≤ 0.8 μm (hygienic zones), EHEDG-compliant root fillet radius, and material certificate. Korea Ever-Power provides free gear sizing consultation for new packaging machine designs — contact with motor kW, speed, required ratio, and any hygiene or backlash requirements.

Explore Korea Ever-Power Gear Categories

Seven precision gear product lines for packaging, food processing, pharmaceutical and industrial applications worldwide.

Spur Gears

M1–M20 · 316L · 20CrMnTi · DIN 5–8

Helical Gears

Beverage · FFS · low noise · 316L

ベベルギア

Right-angle · packaging line drive

Worm Gears

NSF H1 · FFS · filling machine

Ring Gears

Internal · indexing table · planetary

Planetary Gears

Low backlash · servo · pick-and-place

Plastic Gears

POM · PEEK · FDA · food safe

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Need Spur Gears for Packaging Equipment?

Korea Ever-Power supplies 20CrMnTi, C45, and 316L stainless spur gears for all packaging machine applications — FFS flow wrappers, carton erectors, bottle fillers, labellers, pharmaceutical blister packers, and heavy case packers. DIN 5–8 quality class, NSF H1 lubricant compatible, IP67/IP69K housing options, backlash certified for servo drive applications. Cross-reference for Syntegon (Bosch), Coesia, IMA, Multivac and all major packaging OEMs. ISO 9001:2015 certified.

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Spur Gears for Packaging Equipment:
Drive Design, Hygiene Standards and Speed Synchronisation