For most blanchers, start with a honeycomb (flat wire) belt when you convey larger or whole products and need maximum flow-through; choose an eye link belt when hygiene and a smooth, gentle carrying surface matter most; and use a chain-driven balanced weave belt when small or fine products would fall through an open mesh. Product size and shape guide the mesh; water or steam temperature, load and the cleaning regime guide the alloy and the drive method.
A blancher is one of the most demanding duties on a food line. The belt runs in near-boiling water or live steam, stays under constant saturated moisture, carries heavy wet loads, and must satisfy strict food-safety and wash-down rules. On top of that, it has to let water and steam pass straight through the product bed for even heating, drain quickly on the exit incline, resist corrosion for years, and keep tracking without slipping while fully loaded and wet. No single belt is "best" for every blancher — the right choice depends on what you convey and how you clean it. This guide compares the three constructions PFM Screen builds most often for blanching, then covers the open-area, material and drive engineering that decides service life, and closes with a detailed FAQ.
Why Blancher Belts Are a Special Case
Before comparing constructions, it helps to be clear about what the blancher environment does to a metal belt. Understanding these five stresses is what separates a belt that lasts years from one that fails in months.
Heat and thermal expansion
Hot-water blanching runs at roughly 70–100°C and steam blanching a little higher. Metal expands as it heats, so a belt that is correctly tensioned cold can go slack once up to temperature. The take-up and tracking system has to absorb that movement, which is one reason positive (sprocket or chain) drive is preferred over friction drive on a blancher.
Constant moisture and corrosion
The belt is wet 100% of the time, and blanch water often carries dissolved plant acids, salts or blanching aids. That environment attacks the wrong alloy through pitting and stress-corrosion cracking. Material grade — not belt style — is the single biggest driver of corrosion life here.
Flow-through and drainage
Even blanching depends on hot water or steam reaching every piece, which needs a high open area through the belt. At the exit, the same open area lets the product shed water before the next process step. Open area is therefore a leading specification for any blancher belt.
Product retention vs. product damage
The mesh must be open enough to flow yet closed enough to retain the smallest piece you convey. Blanched product also softens, so the carrying surface must support it without bruising or marking. These two needs often pull in opposite directions, and the balance point decides the construction.
Hygiene and cleanability
Food blanchers run CIP or manual wash-down between shifts. A belt with fewer crevices and good rinse access is easier to keep hygienic, and every food-contact part — mesh, cross rods and side chains alike — should be a food-grade stainless steel.
Direct Comparison
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Feature
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Honeycomb / Flat Wire Belt
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Eye Link Belt
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Chain-Driven Balanced Weave
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Open area / flow-through
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High open area (approx. 40–65%) for fast water and steam penetration and quick drainage.
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Open, free-draining rod-and-eye surface with a flatter carrying plane.
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Open area set by pitch and wire size; can be woven tighter to retain small pieces.
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Product support
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Best for larger or whole products; a very open surface may let small pieces through.
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Smooth, stable surface that is gentle on softened, delicate product.
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Mesh selected to support small or fine products without loss.
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Drive method
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Positive sprocket drive; no slip on wet, loaded runs.
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Positive sprocket drive for reliable tracking.
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Driven side chains keep the woven mesh from wandering in the bath.
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Cleaning / hygiene
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Open structure rinses well for CIP wash-down.
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Flat, low-crevice surface is easy to clean; suits strict hygiene needs.
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Woven mesh with side chains; specify for accessible wash-down.
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Typical product
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Diced or whole vegetables, root crops, meat and poultry pieces.
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Delicate or easily-marked product; wide, heavy-duty blanch tunnels.
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Peas, sweet corn, cut leaf, diced fruit, nuts and other small pieces.
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The clear opening in every case depends on the pitch and wire diameter. PFM Screen builds each construction in food-grade stainless steel and can add the flights and side guards a blancher incline needs.
Choose a Honeycomb / Flat Wire Belt If...
Honeycomb / Flat Wire Belt
You need the highest possible flow-through
The flat wire (honeycomb) construction is built from formed flat-strip pickets standing on edge, joined by straight cross rods. Its published open area is roughly 40–65% depending on pitch and strip size, giving one of the most open surfaces of any metal belt. Hot water or steam passes straight up through the product bed for even, fast blanching, and the same open lattice drains the product quickly on the exit run. This is the classic starting point for most blancher lines.
You convey larger or whole products
Root crops, diced or whole vegetables, meat and poultry pieces sit well on the even carrying level. Match the pitch and clear opening to the smallest piece you convey so nothing drops through — cross-rod pitch alone does not define the actual opening. If the product is very small, look at the balanced weave option below.
You want positive, slip-free drive on a wet line
Flat wire belts are usually driven by sprockets that engage the belt structure directly, so a wet, fully loaded belt will not slip or wander the way a friction-driven belt can. Welded, clinched and chain-edge finishes are available to suit the conveyor. Send us the smallest product size and the belt width, and we will confirm the pitch and wire sizes.
Applications to consider: vegetable and root-crop blanching, meat and poultry pre-cook, and any duty where flow-through and drainage lead the specification. See our Honeycomb Conveyor Belt and Flat Wire Belt.
Choose an Eye Link Belt If...
Eye Link Belt
Hygiene and easy cleaning come first
The eye link surface is flat with relatively few crevices, so it rinses down quickly and leaves little for residue or bacteria to hold on to. For lines under strict food-safety and CIP wash-down routines, this is often the preferred carrying surface.
Your product softens and marks easily after blanching
Blanched product is warm and delicate. The smooth, closely spaced eye link surface carries softened vegetables, tomatoes or mushrooms with less mechanical damage than a very open mesh, while still draining freely. Eye and spacer arrangements can be set for narrower or wider gaps, so the belt is not limited to large products.
You run a wide, heavy-duty blanch tunnel
Eye link belts carry heavy loads across wide widths and are driven positively by sprockets, so tracking stays reliable under a full wet load. If a photo of your current belt is available, send it and we can match the eye and rod detail for a like-for-like replacement.
Applications to consider: hygiene-critical blanching, delicate produce, and wide heavy-duty tunnels. See our Eye Link Conveyor Belt and Eye Flex Belt.
Choose a Chain-Driven Balanced Weave Belt If...
Balanced Spiral Woven Belt
Your product is small or fine
Peas, sweet corn, cut leaf, diced fruit and nuts will drop through a very open flat wire belt. A balanced weave is built from alternating left- and right-hand spirals and can be woven to the exact mesh your product needs, so pieces stay on the belt while water still passes through.
You still need positive drive in the water bath
A plain woven belt driven only by friction can wander in a bath. Adding driven side chains (for example C2082 or C2062 hollow-pin chain) at each edge gives positive engagement, so the belt tracks and drives reliably while keeping the fine mesh across the full width. We match the chain to the width, load and temperature.
You want to balance retention, cost and open area
The pitch and wire diameter set both the retention and the remaining open area, so the belt can be tuned to hold the product without over-restricting flow. A denser weave alone does not raise the temperature or load rating — those come from the wire size and alloy. Tell us the smallest piece size and we will propose a mesh.
Applications to consider: blanching peas, corn, cut leaf vegetables, diced fruit and nuts on driven side chains. See our Balanced Spiral Woven Conveyor Belts and Chain Link Conveyor Belts.
Flights, Side Guards and the Exit Incline
Most blanchers have a submerged bath followed by a sloped exit run that lifts the product clear of the water. On that incline, product tends to slide back down the belt. Whichever construction you choose, we can add welded cross flights (baffles) to carry the product up the slope and side guards to keep it from spilling over the edges.
Flight height and spacing are calculated from your incline angle, product depth and batch load, and the flights must still allow the belt to articulate cleanly around the drive and return components. Side guards can be fixed steel plates or chain-mounted edges. Share the incline angle and target throughput with your enquiry so the retention design matches the line.
Material Selection: SS304 vs. SS316 / SS316L
On a blancher, alloy choice does more for belt life than any other single decision. Use the guide below as a starting point and confirm the grade against your actual water chemistry and cleaning cycle.
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Material
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Best for
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Watch out for
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Stainless Steel 304
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Standard hot-water or steam blanching in clean water; general food duty.
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Vulnerable to chlorides — salt, brine, chlorine-based CIP chemicals.
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Stainless Steel 316 / 316L
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Salty or acidic blanch water, chlorine or acid/alkaline CIP, marinades and brines.
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Higher cost — but far cheaper than an unplanned line stop from belt failure.
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Two rules apply to every food blancher. First, every part that touches food or blanch water should be the same grade of stainless steel, including the cross rods and any side chains — carbon-steel chain has no place on a food blancher because rust can contaminate product. Second, when in doubt in a chloride environment, move up to 316L; the modest cost increase avoids the far larger loss of a corroded belt failing mid-shift. Selecting stainless steel alone does not guarantee long life — load, alignment, cleaning and maintenance all contribute.
Drive, Tracking and Maintenance
Wet, loaded belts slip on friction drums, so blanchers almost always use positive drive — sprockets engaging a flat wire or eye link belt directly, or side chains engaging chain sprockets on a balanced weave belt. Positive drive holds speed and tracking even when the belt is fully submerged and loaded.
Support the carrying and return runs on stainless steel or food-grade UHMW-PE wear strips to limit sag inside the bath, and provide enough take-up travel to absorb thermal expansion as the belt heats. For planned maintenance, confirm the splice or joining method up front so a future repair or section replacement is quick. When you specify the belt, we can also supply matched sprockets or chain so the drive and belt wear together rather than against each other.
Frequently Asked Questions
What is the best metal conveyor belt for a blancher?
There is no single best belt — it depends on the product. For larger or whole products where flow-through leads, a honeycomb / flat wire belt is the usual first choice. For delicate product and strict hygiene, an eye link belt is preferred. For small or fine pieces that would fall through an open mesh, a chain-driven balanced weave belt is the safe choice. Confirm the smallest piece size, temperature and cleaning method and we will narrow it down.
Should I use SS304 or SS316 for a blancher belt?
Use SS304 for standard hot-water or steam blanching in clean water. Move up to SS316 or SS316L when the blanch water carries salt or acids, or when your CIP cycle uses chlorine-based or acidic/alkaline cleaners. Chlorides are the main threat to 304, and 316L resists them far better.
How do I stop small products falling through the belt?
Match the belt's clear opening to the smallest piece you convey, and remember that cross-rod pitch is not the same as the clear opening. If a flat wire belt is too open for peas, corn or cut leaf, a balanced weave belt woven to a finer mesh will retain them while still draining. Send the smallest piece dimension and we will propose the mesh.
Why do blancher belts use positive (sprocket or chain) drive instead of friction drive?
A blancher belt is wet and heavily loaded, and it heats up and expands in service. A friction drum can slip under those conditions, causing tracking and speed problems. Positive sprocket or side-chain drive engages the belt mechanically, so it keeps driving and tracking reliably even fully submerged.
Can you add flights and side guards for the exit incline?
Yes. On any of the three constructions we can weld cross flights to carry product up the exit slope and add fixed or chain-mounted side guards to prevent spillage. Flight height and spacing are calculated from your incline angle, product depth and batch load.
Can you match a replacement for my existing blancher belt?
Usually yes. Send the belt width and length, the mesh pitch and wire sizes if known, the edge and drive arrangement, and clear photos of the carrying surface, underside, edge and drive sprockets. A short belt sample is the most reliable way to match an unfamiliar specification.
What information should I send to get an accurate quote?
The essentials are: what you blanch and its smallest piece size; belt width and length; operating temperature; incline angle if any; the required throughput and belt speed; and how you clean the line (manual or CIP, and which chemicals). A product photo or a photo of your current belt speeds things up considerably.
Let PFM Screen Help You Choose Your Blancher Belt
Tell us what you blanch, the smallest piece size, the belt width, the operating temperature, the incline angle if any, and how you clean the line. A product photo or a photo of your existing belt is a useful starting point. We will compare the mesh options and set out a proposed specification for your review.
Browse the constructions covered in this guide: Honeycomb / Flat Wire Belt, Eye Link Belt and Balanced Spiral Woven Belt.
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