TDPH-2.3 Automatic CNC Circulating Band Knife Foam Cutting Machine 3000x2200 mm 1300 mm Height

Product Overview

The TDPH-2.3 is an automatic CNC contour cutting machine built around a continuously circulating band knife instead of an oscillating blade. The blade runs in one direction at up to 70 m/min and rotates through ±360°, so the cutting head can follow complex irregular profiles without lifting, turning or repositioning the block. For factories moving from low-volume shaping to continuous special-shaped foam production, the difference is mainly cycle time: this machine cuts roughly seven to eight times faster than a conventional oscillating knife cutter on the same profile.

Its working envelope covers blocks up to 3000×2200 mm with a cutting height of 1300 mm, which matches the standard output of most batch foaming and block-cutting lines. Positioning tolerance is held at ±0.5 mm. The machine handles the soft foam families that make up the bulk of the profiling market: PU sponge, EPE pearl cotton, PE and EVA, plus laminated blocks of these materials where the adhesive lines are fully cured.

Unlike a hot wire or a die press, the circulating band knife separates the foam cells with a thin, continuously moving steel blade. There is no melting, no kerf, no burnt odour and no hardened edge, so the cut face stays open and bondable for the next lamination or gluing step. Because the blade turns through a full 360 degrees, shapes that would need multiple setups on a fixed-blade machine — rounded chair arms, curved packaging cavities, shoe-padding contours, irregular cushion profiles — can be completed in a single pass.

The TDPH-2.3 is aimed at packaging plants, furniture and mattress factories, luggage and footwear material suppliers, and foam converters that need repeatable contour output at volume. An optional pressure roller holds the workpiece down and prevents the block from lifting or shifting when the blade changes direction, which is particularly useful on tall, soft or laminated blocks.

A circulating band knife is an endless steel band running over two large wheels. The cutting section of the band passes through the workpiece while the return section runs behind the machine guard. Because the band moves continuously in one direction, the cutting action is smooth and uninterrupted: there is no reciprocating stroke, no dead point at the end of each oscillation and no reversal shock at the blade guides.

That continuous motion is the reason for the speed advantage. An oscillating blade spends part of every stroke reversing direction, and the effective cutting time is only a fraction of the cycle. A circulating band knife uses the full cycle for cutting, which is why the TDPH-2.3 can run at 0–70 m/min and still produce a clean edge. On long straight sections the operator can use the higher end of the range; on tight radii the feed rate is reduced so the blade can follow the contour without pushing the foam.

The ±360° blade rotation is the second key capability. The cutting head rotates the band around the vertical axis, so the blade edge always faces the direction of travel. The operator does not need to rotate the block or run the profile in several passes. On a complex shape, the machine simply follows the programmed path, and the blade orientation is maintained automatically by the control system.

A production cycle starts with the block loaded onto the table and, if fitted, the pressure roller lowered. The operator recalls the part program, checks the blade speed and feed rate for the foam grade, and starts the cycle. The machine completes the contour, returns to the load position and releases the workpiece. Programs are stored by part number, so the same shape can be repeated across shifts without re-teaching.

The machine is built on a rigid frame with a large working table; at 3000 kg and an overall size of 6500×5000×3200 mm, the structure is designed to absorb the load of a full foam block and the pull of a fast-moving band without deflection. The main components are:

• Circulating band knife unit — endless steel band driven at 0–70 m/min, with tensioning and tracking systems that keep the band centred on the wheels during long production runs.
• ±360° rotating cutting head — servo-controlled rotation that keeps the blade edge aligned with the direction of travel, enabling complex contours in a single pass.
• CNC motion system — interpolated X/Y movement with acceleration profiles tuned for foam, so the head does not tear the material when entering a corner or changing radius.
• Working table — a 3000×2200 mm support surface sized for full blocks; the table height and clearance match the 1300 mm cutting height.
• Optional pressure roller — a driven or free-rolling hold-down that keeps tall and soft blocks in contact with the table and prevents lifting during direction changes.
• Control cabinet and operator interface — stores part programs and cutting parameters, with production counters and fault diagnostics.
• Safety guarding and interlocks — the band return path and drive wheels are enclosed; the cycle stops if the guard is opened.

• Seven to eight times faster than oscillating knife cutting — continuous band motion and 0–70 m/min blade speed shorten cycle time substantially on volume profiling work.
• Full ±360° blade rotation — complex irregular contours are cut in one pass without rotating the block or re-fixturing.
• ±0.5 mm precision tolerance — repeatable dimensions across a long batch, so downstream assembly does not need trimming or rework.
• Clean, unsealed cut face — no melting or densification, which protects adhesive joints in lamination and keeps the foam compressible at the edge.
• Wide material coverage — PU sponge, EPE pearl cotton, PE, EVA and compatible laminated blocks.
• Optional pressure roller — stabilises tall, soft or laminated blocks and reduces scrap caused by material shifting.
• Low tooling cost — the profile is a program, not a die; design changes take minutes and require no new tooling.

The practical benefit of the circulating band is not only a higher maximum speed but a higher average speed. On a contoured part, an oscillating machine has to slow down at every direction change because the blade is reversing; the TDPH-2.3 keeps the band moving in the same direction and only the feed rate changes. That means the time saved is largest on exactly the kind of work this machine is bought for: repetitive irregular profiles with many curves.

Accuracy comes from three things working together. The band is guided close to the cutting point, which limits lateral deflection; the servo feed keeps a constant advance through curves instead of speeding up and slowing down with the operator's hand; and the pressure roller, when fitted, prevents the block from creeping. Under normal production conditions the machine holds ±0.5 mm, which is tight enough for parts that go directly into lamination, upholstery or packaging assembly.

Edge quality is a separate advantage. Because the band cuts rather than melts, the cell walls at the cut face remain open. Adhesive penetrates the surface instead of sitting on a glazed skin, and the finished laminate is less likely to delaminate in service. There is also no wire consumption and no fume extraction requirement, which lowers running cost and simplifies the workplace.

• PU flexible foam — cushions, mattress layers, packaging inserts and convoluted profiles.
• EPE pearl cotton — protective packaging, fragile-goods inserts and laminated sheets.
• PE foam — construction, sports and protective packaging components.
• EVA — shoe soles, sports mats, tool inlays and costume parts.
• Laminated foam blocks — where the adhesive has fully cured and the layers are compatible with band cutting.

Custom-shaped EPE and PU inserts, shock buffers, trays and cradles for electronics, instruments, glassware and medical devices. High-volume packaging programs benefit most from the speed advantage, because the same profile is repeated thousands of times.

Irregular PU foam cushions, sofa and chair arm profiles, mattress transition layers and special-shaped accessories. The 360-degree rotating head handles rounded contours that would need multiple setups on a fixed-blade machine.

EVA and PE shaped blanks for luggage lining, shoe padding, insoles and sports protection. These parts often combine tight radii with soft material, where a pressure roller makes a visible difference to yield.

High-volume automatic profiling of large special-shaped foam production, replacing manual cutting or multiple passes on slower equipment. The machine is also a natural upgrade path for plants that already run a vertical block cutter and a peeling line but still shape profiles by hand.

The TDPH-2.3 sits in the shaping stage. Upstream, it receives squared blocks from a foaming line, a horizontal peeling machine or a vertical block cutter. Downstream, its output feeds lamination, gluing, quilting, upholstery or packaging assembly. The link to the previous process matters: the block should have a flat bottom and reasonably square sides, because the table and the pressure roller need a stable reference surface and the program assumes a known datum.

In a typical layout, a vertical cutter squares the block, the TDPH-2.3 cuts the contour, and a lamination line bonds the shaped part to fabric or another foam layer. Where the plant also runs a peeling machine, thin sheets can be peeled first and then profiled, which is often more economical than cutting thin sections from a full block. We can review the complete process with the buyer and recommend table size, roller configuration and material flow before shipment.

• Versus oscillating knife: the circulating band is roughly seven to eight times faster on the same profile, and it does not have the stroke reversal that limits speed on long contours. The oscillating machine remains preferable for very small radii and some very soft grades where band tension can compress the material.
• Versus hot wire: no melted or hardened edge, no wire consumption, no fumes, and better glue adhesion on the cut face. Hot wire is cheaper to buy but limited to straight cuts and simple shapes.
• Versus die cutting: no die cost, no die storage and no waiting for a new die when the design changes. Die cutting remains faster for very high volumes of a single small part.
• Versus manual cutting: repeatable dimensions, lower dependence on operator skill, and a stored program for every part.

Tall foam blocks are light for their size, and a fast-moving band can lift or shift them when the cutting head changes direction. The optional pressure roller addresses this by holding the workpiece against the table across the full width of the cut. It is particularly recommended for blocks above roughly 800 mm in height, for very soft or low-density grades, and for laminated blocks where a layer could separate if the block moved.

For parts that cannot be held by the roller, a simple fixture or a sacrificial base board can be used. The program reference is the table plane, so any fixture must be accounted for in the setup. Our application team can advise on the best holding method once the part drawing and material grade are known.

The band wheels and the return section of the blade are enclosed by guards with interlocks, and the control system prevents the cycle from starting if a guard is open. Emergency stops are placed at the operator position and at the rear of the machine. Blade changes are carried out with the drive isolated and with cut-resistant gloves; because the band is a continuous loop, correct tensioning and tracking after a change are essential and are covered in the manual.

Operation is learned quickly. A new operator typically needs one to two days to load programs, set the roller and blade speed and run a first article. Programming is done offline from a DXF or drawing and transferred to the controller; no machine-side code writing is required. Training at installation, a printed operation manual and remote support for program preparation are included.

• Foundation: a level, reinforced concrete floor able to carry the 3000 kg machine plus the workpiece; anchor points are supplied.
• Power: a dedicated supply matching the 8.5 kW total connected load, with correct earthing and stable voltage.
• Space: the 6500×5000×3200 mm footprint must be accessible from the loading side and allow safe blade changes.
• Daily checks: band tension, band condition, guide cleanliness and roller pressure.
• Weekly checks: wheel tracking, guide wear, lubrication points and electrical connections.
• Spares: band knives, guide inserts, wheel bearings, tension springs and proximity sensors are the usual consumables; we keep these available for repeat buyers.

Band life depends on foam density and abrasive content, but a well-run machine normally gives weeks of production per band. When the cut edge starts to show fuzz or the feed force rises, the band is re-sharpened or replaced. Wheel tracking and guide wear are the second maintenance items to watch, because they gradually open the tolerance if left unchecked.

Each machine is assembled, wired and run before shipment. The test report covers band tracking and tension, head rotation through the full 360 degrees, servo response, guarding, emergency stop and a sample contour cut measured against the drawing. The buyer receives the inspection record with the machine.

The machine is shipped in export-grade packaging with the table and frame protected against moisture, the cutting head secured, and loose parts boxed and labelled. Packaging details are confirmed with the buyer before dispatch because the 6500×5000×3200 mm frame may require a flat-rack or an open-top container depending on the route. Delivery is 45 working days after downpayment, and payment terms are L/C or T/T.

The TDPH-2.3 is the right choice when production volume is high, when profiles include many curves, or when a fixed-blade machine is limiting output. It is not the best choice for very small radii on extremely soft foam, where an oscillating knife may give better control, or for foam containing hard inclusions. Buyers should confirm the maximum block size, the smallest radius and minimum part size, the foam grades, the available power and floor space, and whether a pressure roller is needed. Sharing those details lets us confirm the configuration and the spare band requirement before the order.