PFM Screen steam pre-heater spiral belts are engineered for continuous pre-heating of chip and fiber mats in MDF, HDF, OSB, and particleboard production. Available in polyester (continuous to 150°C) and PPS polyphenylene sulfide (continuous to 240°C), with filler wire-controlled air permeability across 10 standard models. Width to 8 m. Compatible with Siempelkamp, Dieffenbacher, and all major continuous wood panel press lines.
Description
PFM Screen's Steam Pre-Heater Spiral Belts are precision-engineered for continuous chip and fiber mat pre-heating in MDF, HDF, OSB, particleboard, and engineered wood panel production lines. By enabling saturated steam injection directly into the mat surface layers immediately upstream of the continuous press, these belts accelerate resin cure, improve board density uniformity, and deliver documented throughput gains of 10–30% over non-preheated production. Choose from polyester (continuous service to 150°C) or PPS polyphenylene sulfide (continuous service to 240°C) — engineered to survive the combined stresses of high-temperature steam, mechanical tension, and tight roller bending in a wood panel pre-heater zone.
 Polyester Spiral Belt ● Continuous operating temperature: up to 150°C ● Factory heat-setting temperature: 200°C ● Cost-effective for standard MDF and particleboard pre-heater units ● Excellent flexibility around tight roller diameters ● Suitable for low-to-mid pressure steam injection environments |  PPS (Polyphenylene Sulfide) Spiral Belt — For High-Temperature Lines ● Continuous operating temperature: up to 240°C ● Factory heat-setting temperature: 290°C ● Superior hydrolysis resistance under high-pressure steam ● Required for high-throughput HDF, OSB, and pMDI resin lines ● Greater long-term dimensional stability under thermal cycling |
PFM Screen steam pre-heater spiral belts are available in three filler wire configurations — each changing belt air permeability, weight, and mat-contact surface to match your steam injection rate and mat density requirements. No other parameter has a greater effect on the temperature gradient achieved across the mat thickness during pre-heating.
 No Filler Wires Maximum open area and air permeability. Best for high steam-flow, low mat resistance pre-heater zones. | Round Filler Wires Controlled permeability reduction. Balances steam distribution uniformity with mat surface support across the belt width. |  Flat Filler Wires Minimum permeability configuration. Flat-profile wires maximise back-pressure for even steam penetration into dense fiber or chip mats. |
PFM Screen steam pre-heater spiral belts are engineered to the dimensional and performance standards of all major wood-based panel press systems. Share your press model number with our technical team to confirm the exact loop pitch, belt width, and permeability specification for your line.
| Press / Pre-Heater System | Manufacturer | Recommended Belt Material | Typical Panel Type |
|---|---|---|---|
| ContiRoll / ContiBooster | Siempelkamp | PPS (high throughput) / Polyester | MDF, HDF, Particleboard, OSB |
| EvoPress / CPS+ | Dieffenbacher | PPS (high throughput) / Polyester | MDF, HDF, Particleboard, OSB |
| Simbelcomb Pre-Heater | Simbelcomb | Polyester / PPS | MDF, Particleboard |
| Continuous Press Lines | Shanghai Wood-Based Panel Machinery | Polyester / PPS | MDF, Particleboard |
| Continuous Press Lines | Dunhua Yalian | Polyester / PPS | MDF, Particleboard |
Get a Custom Belt Specification Within 24 Hours Share your press model, operating temperature, mat width, and panel type — PFM Screen will specify the right spiral loop, filler wire configuration, and belt material for your pre-heater line. WhatsApp: +86 153 6967 9157Email: polyestermesh@pfmscreen.com |
Feature
Seamless Spiral Loop Architecture Interlocking polyester or PPS spiral loops form a continuous belt body with no warp crossover points and no localized weak spots. Every meter of belt delivers the same permeability, tensile strength, and surface profile — eliminating the permeability variation bands and hot/cold spots that occur with woven belt structures. | Filler Wire Permeability Tuning Air permeability is precisely controlled by inserting round or flat filler wires between the spiral loops — reducing permeability from a maximum of 9,000 m³/m²h (flat filler, model 6890B3) down to 4,480 m³/m²h (small-loop model 5080A1). This allows PFM Screen to engineer the exact steam throughput your specific pre-heater configuration requires. |
Factory Heat-Setting for Dimensional Stability Every PFM Screen pre-heater spiral belt is heat-set before shipment. This process stabilises the spiral loop geometry, relieves internal manufacture stresses, flattens the running surface, and prevents dimensional creep under the combined thermal and mechanical loads of the pre-heater zone. Polyester belts: heat-set to 200°C. PPS belts: heat-set to 290°C. | Sealed Edges & Endless Delivery Belts are delivered endless — joined and sealed to your exact operating circumference. Sealed lateral edges prevent loop fraying and ensure long-term tracking stability on conveyor guide systems. Available in widths up to 8 meters in a single seamless belt body, with no lateral joints or patching. |
240°C PPS Max Operating Temp PPS spiral belts maintain structural integrity and dimensional stability up to 240°C continuous service — covering all HDF and high-throughput OSB pre-heater requirements | 2600 N/cm Peak Strength Large-loop model 120130A1 achieves 2,600 N/cm tensile strength for wide, high-tension pre-heater installations across full 8 m belt width | 9000 m³/m²h Peak Permeability Flat filler wire model 6890B3 achieves maximum steam throughput of 9,000 m³/m²h (563 CFM at 127 Pa) — highest permeability in the product range | 30% Throughput Gain Steam pre-heating compresses resin cure time and reduces press dwell time, delivering documented production throughput improvements of 10–30% |
PFM Screen offers three spiral loop sizes. The correct choice depends on your pre-heater roller diameter, mat type (fiber vs chip), and required belt thickness. Contact PFM Screen with your press system model for a specific recommendation.
Small Loop Model: 5080A1 Spiral loop width: 5.2 mm Belt thickness: 2.1 mm Tensile strength: 1,800 N/cm Weight: 1.5 kg/m² For compact roller systems with the tightest bending radii; lowest profile belt in the range | Medium Loop ★ Most Specified Models: 6890A1 / B1 / B2 / B3 / B4 Spiral loop width: 7.15–8 mm Belt thickness: 2.45 mm Tensile strength: 2,000 N/cm Widest permeability range (5,760–9,000 m³/m²h) The most widely specified loop size — balances flexibility, strength, and filler wire tuning range for MDF and particleboard lines | Large Loop Models: 9090A1 / 90110A1 / 10090A1 / 120130A1 Spiral loop width: 8–12 mm Belt thickness: 3.03–4.3 mm Tensile strength: 2,000–2,600 N/cm Weight: 2.3–2.85 kg/m² For high-tension, wide-belt OSB and coarse chip-mat installations where maximum belt body strength is required |
Uniform Permeability Across Full Belt Width Each spiral is machine-interlocked to identical geometry — no hand-joined anomalies, no permeability variation bands across the belt width, no localized steam channelling or cold spots in the pre-heated mat. Board density profile is consistent from edge to edge. | Hydrolysis Resistance Under High-Pressure Steam PPS monofilament resists degradation from saturated steam, condensate, and the mildly acidic or alkaline extractives released by wood fiber at elevated temperatures — significantly extending service life versus standard polyester in high-intensity steam pre-heater environments. |
Conformability Around Tight Rollers The spiral architecture allows the belt to wrap cleanly around even the smallest infeed and return rollers in compact pre-heater units — without buckling, kinking, or loop deformation. Small-loop model 5080A1 is specified for the tightest roller geometries. | Reliable Long-Run Tracking Stability Factory heat-setting combined with precision-sealed edges ensures the belt tracks straight under full steam load — no edge wandering, no corrugation, no uneven tension buildup across the width during extended production runs. |
Ready to Specify Your Pre-Heater Belt? Talk to a Technical Expert WhatsApp: +86 153 6967 9157Email: polyestermesh@pfmscreen.com |
Application
PFM Screen steam pre-heater spiral belts are installed immediately upstream of the continuous press — carrying the chip or fiber mat through the pre-heater zone where saturated steam is injected from above and below through the permeable belt body. The steam raises the surface layer temperature and moisture content, activating the adhesive resin before the mat enters the press. The result is shorter press cycle time, more uniform board density, and lower energy consumption per cubic meter of panel produced.
| MDF — Medium Density Fiberboard● Fiber mat pre-heating before Siempelkamp ContiRoll or Dieffenbacher EvoPress entry● Steam injection activates UF/MF resin in the surface layer ahead of pressing● Supports thin MDF production (<3 mm) where rapid surface cure is critical● Standard lines: polyester belt; high-throughput lines: PPS belt recommended | HDF — High Density Fiberboard● Higher press temperatures and pressures demand PPS belt material● Steam pre-heating critical to achieve target density (>800 kg/m³) at high line speed● PPS belts withstand elevated steam temperatures in HDF pre-heater units● Supports flooring-grade HDF production with consistent surface bond |
| Particleboard (PB)● Chip mat steam injection improves surface layer particle bond in short press cycles● Reduces blow risk in thick particleboard by managing moisture gradient in the mat● Polyester and PPS belts both applicable depending on line steam temperature● Compatible with Simbelcomb, Dieffenbacher CPS+, and Chinese-made press lines | OSB — Oriented Strand Board● Wide strand mats require wide belts (to 8 m) for even steam distribution side-to-side● PPS belt recommended for high-temperature pMDI and PMDI-based resin systems● Large-loop models (9090A1, 120130A1) support coarser strand mat surface● Improves face-layer bond in structural OSB for construction applications |
 Steam pre-heater spiral belt in service on a continuous wood panel press line | Process Position in the Production Line → Mat Forming Station Chip or fiber mat formed on the forming belt to target basis weight → Pre-Press / De-Airing Belt Mat compressed between forming and pre-press belt; interstitial air evacuated → Steam Pre-Heater Zone [This Belt] Saturated steam injected through the spiral belt from above and below; surface layer resin activation begins; mat temperature and moisture raised → Continuous Press (ContiRoll / EvoPress) Full press cycle — shorter dwell time due to pre-activated resin in surface layers; 10–30% throughput gain achieved |
Panel Types Supported by PFM Screen Steam Pre-Heater Spiral Belts MDFHDFParticleboardOSBPlywoodLVL & Engineered Wood |
Tell Us Your Press System and Panel Type — We'll Specify the Right Belt WhatsApp: +86 153 6967 9157Email: polyestermesh@pfmscreen.com |
Specifications
10 standard models across three loop sizes (small, medium, large). All belts are available in polyester or PPS monofilament. Belts are delivered endless, heat-set, and sealed to your specified operating width (up to 8,000 mm) and circumference. Polyester: continuous service to 150°C / heat-set to 200°C. PPS: continuous service to 240°C / heat-set to 290°C. Custom loop pitch, filler wire configuration, and belt width available on request.
| Loop Size | Model | Spiral Loop Width (mm) | Filament Diameter (mm) | Strength (N/cm) | Weight (kg/m²) | Thickness (mm) | Air Permeability (m³/m²h) | CFM (127 Pa) | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Spiral Ring Mono (mm) | Connection Wire (mm) | Filler Wire | ||||||||
| Small | 5080A1 | 5.2 | 0.5 | 0.8 | Ø0.60 × 3 | 1,800 | 1.50 | 2.10 | 4,480 | 280 |
| Medium | 6890A1 | 8.0 | 0.68 | 0.9 | Ø0.80 × 4 | 2,000 | 2.00 | 2.45 | 6,080 | 380 |
| 6890B1 | 7.15 | 0.68 | 0.9 | Ø0.90 × 3 | 2,000 | 1.90 | 2.45 | 5,760 | 360 | |
| 6890B2 | 7.15 | 0.68 | 0.9 | Ø0.80 × 3 | 2,000 | 1.85 | 2.45 | 7,750 | 484 | |
| 6890B3 | 7.15 | 0.68 | 0.9 | Flat 2.1 × 0.80 | 2,000 | 1.80 | 2.45 | 9,000 | 563 | |
| 6890B4 | 7.15 | 0.68 | 0.9 | Flat 2.1 × 0.88 | 2,000 | 1.85 | 2.45 | 8,000 | 500 | |
| Large | 9090A1 | 8.0 | 0.9 | 0.9 | Ø0.90 × 3 | 2,300 | 2.30 | 3.03 | 7,500 | 468 |
| 90110A1 | 10.0 | 0.9 | 1.1 | Ø1.0 × 4 | 2,000 | 2.40 | 3.15 | 6,240 | 390 | |
| 10090A1 | 8.0 | 1.0 | 0.9 | Ø1.0 × 3 | 2,000 | 2.50 | 3.60 | 5,000 | 315 | |
| 120130A1 | 12.0 | 1.2 | 1.3 | Ø1.2 × 3 | 2,600 | 2.85 | 4.30 | 7,500 | 468 | |
* Model naming convention: first two digits = spiral ring filament diameter × 100; second two digits = connection wire diameter × 100. All belts available in polyester or PPS monofilament. Belt width up to 8,000 mm; custom widths and loop specifications available on request. All specifications subject to manufacturing tolerances.
Q1: What does a steam pre-heater spiral belt do in a wood panel production line? A steam pre-heater spiral belt carries the chip or fiber mat through a pre-heating zone located immediately upstream of the continuous press. Steam injectors positioned above and below the belt fire saturated steam through the open-mesh spiral structure into the mat, raising the surface layer temperature and moisture content. This pre-activates the thermosetting adhesive resin (UF, MF, pMDI, etc.) before the mat enters the press, allowing the press to cure the board faster at the same temperature — reducing press dwell time and enabling 10–30% higher throughput on MDF, HDF, OSB, and particleboard lines. |
Q2: What is the difference between polyester and PPS spiral belts for steam pre-heater applications? Polyester spiral belts are rated for continuous service up to 150°C and are cost-effective for standard MDF and particleboard pre-heater lines operating at moderate steam temperatures. PPS (polyphenylene sulfide) spiral belts are rated for continuous service up to 240°C, offering significantly better resistance to hydrolysis, thermal degradation, and dimensional creep under high-pressure saturated steam. PPS is the specified material for high-throughput HDF lines, OSB lines using high-temperature pMDI resin systems, and any installation where the belt regularly operates above 150°C. Both materials are factory heat-set before delivery to maximise dimensional stability. |
Q3: How do filler wires control air permeability, and which configuration should I choose? Filler wires are monofilaments inserted laterally between the spiral loops to partially fill the inter-loop openings, reducing the effective air permeability of the belt. No filler wires = maximum permeability (up to 9,000 m³/m²h). Round filler wires reduce permeability moderately while maintaining a rounded surface contact with the mat. Flat filler wires achieve the greatest permeability reduction. The correct configuration depends on your steam injection rate, mat basis weight, and the desired temperature gradient through the mat cross-section. PFM Screen's technical team will specify the optimal filler wire type and count based on your process parameters — share your mat specifications and press system details when inquiring. |
Q4: Which press and pre-heater machine brands are compatible with PFM Screen steam pre-heater spiral belts? PFM Screen steam pre-heater spiral belts are engineered to the dimensional and performance requirements of all major wood-based panel press systems, including Siempelkamp ContiRoll and ContiBooster, Dieffenbacher EvoPress (formerly CPS+), Simbelcomb, Shanghai Wood-Based Panel Machinery, and Dunhua Yalian continuous press lines. The correct loop pitch, belt width, filler wire configuration, and material (polyester vs PPS) must be matched to your specific press model — contact PFM Screen with your press type and belt dimensions for a confirmed specification. |
Q5: What loop size (small, medium, or large) should I specify for my pre-heater? Loop size selection is driven primarily by the minimum roller diameter in your pre-heater unit and the mat type. Small-loop model 5080A1 (loop width 5.2 mm, thickness 2.1 mm) is specified for compact units with the tightest bending radii. Medium-loop models 6890A1 through 6890B4 (loop width 7.15–8 mm, thickness 2.45 mm) are the most widely used and offer the widest range of filler wire configurations for MDF and particleboard applications. Large-loop models 9090A1 through 120130A1 (loop width 8–12 mm, thickness 3.03–4.3 mm) are specified for high-tension wide belts on OSB and coarse chip-mat lines requiring maximum tensile strength (up to 2,600 N/cm). Share your roller diameters and pre-heater design with PFM Screen for a confirmed loop size recommendation. |
Q6: What throughput improvement can I realistically expect from adding a steam pre-heater belt? Industry data and press manufacturer records (including Siempelkamp's ContiBooster documentation) report throughput gains of 10–30% on MDF, HDF, OSB, and particleboard lines following installation of steam pre-heating. The specific gain depends on the baseline press speed, mat moisture content, resin type and dosage, target board thickness, and the steam injection rate achievable through the belt. The pre-heater reduces required press dwell time by initiating surface-layer resin cure before the mat reaches full press pressure — allowing higher line speeds at the same final board quality target. PFM Screen can provide case data relevant to your panel type on request. |
Q7: How is the belt delivered and installed — is it truly endless? Yes. PFM Screen steam pre-heater spiral belts are delivered as a fully endless loop, sealed to your specified operating circumference and belt width. The spiral loops are joined and the seam is finished to match the open-area and surface profile of the rest of the belt — there is no visible join line, no permeability disruption at the seam, and no hardware to catch on steam injector nozzles. Endless delivery means the belt is ready to install directly onto the pre-heater conveyor rollers without any on-site joining. Confirm your available installation access (whether the belt can be slid on over an end roller, or requires a straight-through threading path) with PFM Screen before ordering so the correct closure method is applied. |
Q8: What is the minimum order quantity and typical lead time for a custom-width steam pre-heater spiral belt? PFM Screen accepts orders for single replacement belts through to multi-belt project supply — there is no fixed minimum order quantity. Standard lead time for custom-width, custom-circumference steam pre-heater spiral belts is typically 3 to 6 weeks from drawing confirmation, depending on belt width, material (polyester vs PPS), loop model, and current production scheduling. Rush lead times can be discussed for urgent replacement situations. Contact PFM Screen via WhatsApp (+86 153 6967 9157) or email (polyestermesh@pfmscreen.com) with your belt width, circumference, loop model, material, and press system — we will respond with a formal quotation and lead time confirmation within 24 hours. |
Ready to Order? Get Your Custom Quote Within 24 Hours Send us your belt width, circumference, loop model, material (polyester or PPS), filler wire configuration, and press system — PFM Screen will respond with a full specification and pricing within one business day. WhatsApp: +86 153 6967 9157Email: polyestermesh@pfmscreen.com |
