Double Layer Roll Forming Machine Manufacturer | 840/900 Roof Tile Making Machine for Steel Building

Product Description

Double layer roll forming machine from the manufacturer, built around the 840 and 900 panel widths — the pairing that leaves the factory more often than any other, for steel building work where the market orders two standard profiles again and again.

A double layer machine stacks two independent sets of forming rollers one above the other inside a single frame, driven from one shared transmission. By repositioning the guide plates and baffles that lead the coil into the machine, the operator directs the strip into the upper or the lower roller set, and the same body produces the other panel. What makes this page specific is the pairing: the two most frequently specified panel widths in the market, carried on one body, so that a fabricator can produce both of the profiles a steel building project asks for most often without buying and housing two separate lines.

First, a clarification that protects your money: “roof tile” here means profiled steel roof panel, not antique glazed tile.

This is worth settling before anything else, because the phrase “roof tile making machine” is used for two different products in this industry, and buyers arrive at pages like this one carrying the wrong picture perhaps as often as the right one.

In the title of this page, roof tile means the profiled steel roof sheet — the trapezoidal metal panel that covers industrial and commercial buildings, factories, warehouses, logistics sheds and workshops. It is formed from coated steel coil by continuous rolling, and it is the ordinary workhorse roof and wall cladding of the steel building industry. The 840 and 900 figures are the width designations by which these panels are commonly known in the trade.

It does not mean the antique roof tile — the panel that imitates traditional clay tile, with an imprint stamped across each peak so that the finished roof reads as rows of tiles rather than as a smooth corrugation. That product is made on a different machine: a glazed tile machine, which is an arc-forming machine with an additional pitch-stamping device. It serves a different building type — villas, mosques, heritage and tourism projects, boutique hospitality — and it is a different purchase.

There is a further wrinkle worth knowing, and it causes real mistakes. The same width figures appear in both families: a profile designated by one of these widths can be a conventional trapezoidal panel, and the same width also occurs among the glazed tile profiles in the factory’s archive. So a width alone does not identify the machine. When you send an enquiry, state the profile family and the width — conventional trapezoidal or antique glazed tile — together with a cross-section drawing or a sample. A supplier who quotes from the width alone is guessing at which machine you meant, and if they guess the wrong family you will receive a perfectly good machine that produces the wrong product, which is the most expensive kind of error in this category because it is discovered after delivery.

Why this pairing is the volume build, and what that means for you.

The pairing described on this page is two trapezoidal layers: both profiles are conventional trapezoidal panels, formed by straightforward continuous rolling. Neither layer needs a pitch-stamping device, and neither needs curved tooling. That has three consequences, and all three work in the buyer’s favour.

First, it is the simplest family in the double layer range to build, which makes it the least expensive pairing to buy. Two tooling sets built on the same forming principle cost less than two tooling sets built on different principles, so a pairing of two trapezoidal layers sits at the economical end of the range, below combinations that mix a curved layer with a pitch-stamped layer.

Second, it is the most predictable to commission. Because both layers form the same way, the alignment work does not have to reconcile two different processes inside one frame — which is exactly the difficulty that makes a curved-plus-pitch-stamped pairing the most demanding of the common combinations.

Third, and most persuasive if you are buying rather than specifying — this is the pairing the factory builds and ships most often. The double layer archive records the 840 and 900 width pairing as its highest-frequency build, established across many repeat orders, with a standard configuration already settled from that experience. In practical terms, you are not commissioning a novel machine: you are ordering a configuration that has been built repeatedly, which is a materially lower-risk purchase than being the first to try a pairing. That is the real value of choosing a workhorse pairing rather than an exotic one.

One profile at a time — the sentence no supplier should omit.

A double layer machine carries two tooling sets, not two production lines, and it produces one panel at a time. Changeover is a matter of minutes of guide adjustment rather than a machine swap, but the two panels cannot be run simultaneously from a single drive. For most fabricators this is not a limitation, because roof work and wall work generally arrive as different jobs on different days, and a changeover of a few minutes fits that rhythm comfortably. If your order book genuinely runs both profiles in parallel at volume, the correct purchase is two single-layer machines, and a supplier who will not say so is optimising for their order value rather than your production.

The three checks that decide whether your two panels belong on one body.

Even for a workhorse pairing, three engineering rules decide whether your particular two profiles fit, and a buyer can use them to test any quotation.

The first is row-count balance between the two layers. Because both of these layers are trapezoidal, their forming requirements are usually close, which is the cleanest case: neither layer ends up lightly formed while the other is heavily worked. Where the two profiles do differ substantially in the number of forming stages they need, the lightly formed layer tends to show panel defects, and because both layers run at one speed from a shared drive, unequal roller diameters make the strip travel less steadily. A modest difference can be absorbed in the design; a large difference needs compensating work; an extreme difference should be answered in writing by engineering rather than chosen from a catalogue.

The second is feed width — and here the width designations are useful but not sufficient. Because these two profiles are commonly specified at close widths, the machine can often share one decoiler and one feed frame, which keeps the arrangement simple: one coil position, one material path, a quick and predictable changeover. That is the ideal. But the designation on your drawing is not the same thing as the coil width you can actually buy, and in the Gulf a coiled steel supplier may stock a narrower range of widths than the panel drawings assume. Confirm what you can source before the machine is specified around a width you cannot obtain.

The third is frame and drive specification. The frame of a double layer machine is set by the heavier of the two layers and steps up a grade from the single-layer frame that the same profile would need on its own, because the frame carries both roller stacks and absorbs the vibration of both. The chain is specified for the layer with the greatest torque demand. This is why a double layer quotation runs above the price of the heavier of its two single-layer equivalents, and why a quotation carrying single-layer frame or chain specifications on a double layer body should be questioned before it is compared on price.

What the width designation does not tell you — the most important technical caution on this page.

A width figure identifies a family of panels, not your panel. Two machines can both be described by the same width and still be different machines, because the profile is defined by its peak count, its pitch, the shape of its rib and trough, and the exact cross-section — not by the width alone. Among the factory’s own archive, the same width appears across multiple proven profiles with different characteristics, some suited to long-span roofing, some to wall cladding, some with additional stiffening detail in the rib.

So when you specify, do not rely on the width. Send a cross-section drawing or a sample of the panel you actually intend to sell. That drawing is what the factory matches against its archive to identify whether your profile corresponds to a proven blueprint or requires new tooling, and it is the difference between receiving a machine that produces your panel and receiving a machine that produces something close to it.

Material thickness is a per-layer question.

The two layers will rarely run the same gauge. A roof panel carries load and takes weather on an exposed plane, so it is often the heavier of the two; a wall panel is cladding, where appearance and weather-tightness matter more than structural span, so it is frequently the lighter. The machine must be specified for the heavier layer, and the working thickness range should be confirmed for each layer separately and in writing, rather than assumed from a single figure offered for the machine. On a two-layer machine, thickness is not one number; it is two.

Machine height, weight, and the workshop that has to hold it.

Stacking two roller sets makes a double layer machine taller and heavier than the single-layer machine for either of its panels. Three things belong in the pre-order checklist rather than in post-delivery surprises: clear height for the machine and for lifting the upper roller set during commissioning and maintenance; floor capacity and a lifting plan for the weight; and the machine’s overall height and access route checked against the building itself — roof trusses, crane rails, door openings and the path the machine takes to its position. Where the panels are very wide or very heavy, a double layer body may not be the right answer at all, and the conversation should move back to two single-layer machines.

Where this pairing earns its keep in the Middle East.

The Gulf construction market is dominated by exactly the building types this pairing serves. Industrial and logistics buildings, factories, warehouses, workshops, storage and agricultural sheds, labour accommodation blocks, commercial units and the general run of steel-framed structures all need conventional profiled roof and wall cladding, ordered repeatedly, in quantity, at the widths the market has settled on. A fabricator in that market is asked for the same two or three panel types week after week, and that repetition is precisely what makes the highest-frequency pairing the right purchase: you are buying the machine that matches the pattern of your order book rather than a machine chosen to look impressive on a specification sheet.

It also fits the way many Gulf fabricators actually work. A workshop serving local contractors typically needs a roof panel and a wall panel rather than two exotic profiles, and it needs them on a footprint and a capital budget that will not stretch to two separate production lines. One body producing both of the profiles the market asks for most often, switched a few times a week at a changeover measured in minutes, is the arrangement that suits that business.

Two climate points belong with the specification. Along the Gulf coast, humidity and salt-laden air place the emphasis on the coil and the coating system the buyer chooses, because cladding on a coastal building is exposed on both faces and the coating decides how long the appearance and the weather-tightness survive — the machine forms the geometry and nothing more. Inland, intense solar loading, strong thermal cycling and wind-borne dust put the same emphasis on the coil. A lifespan question answered with a machine figure is an answer to a different question. And because a double layer machine is taller, heavier and more loaded with tooling than the single-layer machine for either panel, installed in a hot, humid workshop, its own surface protection, lubrication routine and alignment checks matter more, not less: the maintenance plan belongs in the purchase conversation rather than in an afterthought afterwards.

As the manufacturer and supplier.

These machines are built and supplied directly by the factory, not resold through intermediaries, and they are built from a tooling archive rather than designed from scratch for every order. That archive is what makes the pairing on this page a low-risk purchase: because the two trapezoidal layers at these widths have been built repeatedly, a buyer starts from an established configuration rather than from a blank sheet. When you send your two profiles, the factory identifies the closest production-proven blueprint, runs the two checks that decide whether the pair belongs on one body — the balance of forming stages between the layers and the feed width of each — and states in writing whether your pair matches an existing build or requires new tooling. Frame class, chain specification and the commissioning plan follow from the heavier of the two layers. Documentation, electrical configuration matched to the destination market, installation and commissioning with factory technicians on site, operator training, illustrated manuals, video guidance, engineering support and spare parts supply form part of the supply relationship, and the specific scope should be written into the order rather than assumed.

To quote this machine, send these items. The two panel profiles you intend to produce, each with a cross-section drawing or a sample — peak count, pitch, rib and trough detail, and the effective width — rather than the width designation alone. Confirmation of which family you want for each layer, because the same widths occur in both the conventional trapezoidal range and the antique glazed tile range. The working thickness for each of the two layers. The coil widths you can actually buy in your market. The material and coating system you intend to run. Whether the two profiles run in parallel at volume, because that single answer decides between a double layer machine and two single-layer machines. Your workshop’s clear height, floor area and lifting arrangements. The panel lengths and the daily output you need for each profile. Your site’s voltage and frequency. Whether you also need to slit coil to width. With those answers the factory can propose the configuration, state the frame and drive specification the pair requires, confirm whether the profiles match proven tooling or need new tooling, and return an itemised factory-direct quotation with the line layout drawing for your building.

In one sentence, the honest summary. A double layer machine built around the 840 and 900 widths is the volume pairing: two conventional trapezoidal layers, the simplest and least expensive family in the range, and the build the factory has made most often — which makes it a low-risk machine to buy, provided you specify by cross-section rather than by width, and accept that it produces one panel at a time.

♦ COMPANY PROFILE:

    Hebei Xinnuo Roll Forming Machine Co., Ltd., not only produce different types of professional roll forming machines, but also develop intelligent automatic roll forming production lines, C&Z shape purline machines, highway guardrail roll forming machine lines, sandwich panel production lines, decking forming machines, light keel machines, shutter slat door forming machines, downpipe machines, gutter machines, etc. 

Roll forming is a continuous process which converts sheet metal into an engineered shape using consecutive sets of mated rolls, each of which makes only incremental changes in the form. The sum of these small changes in form is a complex profile.