The very word "fold" comes from the German falz, which means “groove” or “gutter”, hence the name for this type of connection. Folding is good because it is such a technique and method of work in which there will not be a single nail or self-tapping screw on the surface. Of course, there is nothing wrong with fastening roofing materials with self-tapping screws if modern technologies are used: the hole is securely closed from above rubber gasket, clamping is provided by tightening the self-tapping screw. But still, the absence of fasteners on the surface gives a feeling of greater tightness and a guarantee against leaks, and also expresses a peculiar stylistic approach.

Fold types 1) standing single; 2) standing double;

3) recumbent single; 4) recumbent double

Distinguish seam connections recumbent and standing, single and double, as well as latched. The lateral long edges of the strips of steel, running along the slope, are connected by standing folds, and the horizontal ones are recumbent. Folds are made (rolled up) either manually special tool, or modern way- special electromechanical seaming devices. Usually the height of the double standing seam is 25mm. European standard, American equipment produces a rebate with a height of 38 mm. Single fold device possible on roofs with a slope of 30 to 60% (16-30°), the double seam reliably protects even flat roof having a slope of 5% (2-3°).

Roof overhang on a wooden crate

When installing the roof in places of the greatest accumulation of water (gutters, grooves, valleys) roofing sheets connect only double fold. Before installation of a folded roof, necessary measurements and calculations of the required number of roofing paintings and additional elements roofs (overhangs, grooves, valleys, junctions), as well as coordination of all nodes for mounting paintings, junctions, overhangs and grooves. This is usually done at the design stage or when calculating the cost of a seam roof by the seller (manufacturer) of the roofing material. It is very important to determine the type of catchment and drainage on a given roof.

Section of the weight of the roof on a wooden crate 1) eaves board, underestimated; 2) false punk made of galvanized steel; 3) drip;

4) round end of the roof overhang with reverse edging; 5) hanging chute,

gutter fastening; 6) the clamp is attached directly above the dropper;

7) drip from the air zone

The end of the roof overhang 1) rounded; 2) oblique; 3) direct

When installing a seam roof There are two types of catchment: using a hanging or wall gutter. The advantage of a suspended gutter is the complete collection of water, including even drops from the eaves, as well as the absence of additional lying folds, which makes the cornice overhang more reliable. The disadvantage is that as a result of the impact of ice and icicles, the hanging gutter is deformed. And in the event of snow and ice coming off, the gutter can fly out of the fasteners. The disadvantage of the wall gutter is that, simultaneously with the function of collecting water, it partially performs the functions of snow retention in winter time, basically useful property, but requiring from the performers especially careful performance of work.

Wall gutter device

Wall gutters are the most common location for leaks in seam roofing. In winter, wall gutters are a stopper for ice and snow, and when temperatures fluctuate near zero, the snow is saturated with melt water. The water level rises to the level of melted snow, and as you know, water will always find a gap if it is given the opportunity. So, the dimensions have been taken, the amount of material has been calculated, it is necessary to proceed with the preparation of roofing paintings. The essence of the process is to bend the edges of the sheet on four sides for their subsequent connection on the roof with folds.

Materials required for the installation of seam roofing

1) metal sheet, galvanized or coated (polyester, pural). copper, zinc-titanium, aluminum; 2) drainage system: 3) crate; 4) counter-lattice; 5) waterproofing; 6) insulation; 7) vapor barrier; 8) double-sided tape;

9) filing the ceiling; 10) technological crate; 11) rafters;

12) plain crate; 13) cornice filing (soffit)

Harvesting can be done by hand or mechanized way on folding machines. When using a folding machine, it is possible to make a picture the length of the entire slope (the so-called roll technology). Bending folds by hand is a rather cruel method in relation to your own time and effort. It is suitable only in the case when it is necessary to cover the roof small dacha, bathhouses, outbuildings, and with thin sheet metal.

Installation of finished paintings

For cottages, where roofs of 200-300 m2 are typical, it is almost impossible to manually bend such a volume of steel, therefore, manufacturers or sellers of roofing steel sell folded paintings, already prepared for folding, of the required length, according to their own calculations. In some cases, when large volumes- cutting of pictures and raising of a fold is made directly on a construction site or directly on a roof. All elements of a metal roof - overhangs, gutters, grooves, aprons - are arranged along a wooden crate. With a distance between the rafters of up to 1.2 m, the crate is arranged from boards with a section of at least 25x100 mm. The recommended batten spacing is 300-400 mm. With such an arrangement wooden elements the foot of a person walking along the slope of the roof will always rest on at least one bar, which will prevent the deflection of the roofing.

Ventilated gable roof ridge 1) ridge element; 2) false plank made of galvanized steel;

3) wooden crate; 4) a grid from flying snow; 5) laid fold;

6) execution of a fold in the form of an envelope

For rigid roofs, it is very important to maintain a normal temperature and humidity regime in the under-roof space. Violation of the required parameters leads to the formation of condensate on inside sheets, which can also cause premature corrosion. Therefore, it is recommended to lay a waterproofing layer over the rafters and fix it with bars along the entire length to ensure the necessary ventilation of the under-roof space. For the installation of a cornice overhang and wall gutters, a solid boardwalk with a width of 500-700 mm is laid.

Shed roof ridge with roof beam 1) ridge element; 2) a galvanized steel fly and plank;

3) wooden block> 60 mm; 4) laid fold; 5) facade overlap

depending on building height > 50 mm< 100 мм

It is also recommended to use solid battens with complex roof geometry and slopes from 3° to 14°. Along the ridge of the roof, two boards converging with edges are laid, which serve to maintain the ridge joint. A solid flooring of boards is also arranged under the grooves (up to a width of 500 mm in each direction). The cornice overhang begins to be arranged with the installation of pins with brackets (for a water intake funnel) and a T-shaped crutch. The cross bars of the crutches are placed at a distance of 120 mm from the overhang of the boardwalk. Pins, like crutches, are cut flush into the flooring and fastened with nails or screws. The paintings are alternately placed on crutches in such a way that their transverse strips enter the limbs of the droppers.

Comb with bar and cover profile

1) the abutment height must be > 60 mm; 2) laid fold

At the end of the coating of the cornice overhangs, wall gutters are laid. Typically, the gutters are located between the water intake funnels with a slope of 1:20 to 1:10. The connection of a wall gutter with an ordinary slope coating is made with a single or double lying seam. The installation of a seam roof to the crate is carried out using special building elements in the form of a steel strip with clamps - clamps. which at one end lead into the folds, and at the other they are attached to the crate beam. Clamps are placed at the rate of at least two on each side of the sheet (after about 400, maximum 600 mm), fasten them with galvanized nails or screws to the lathing bars and bend them onto the edge of the small bend.

Comb with profile

When using sheets longer than 10 m, in order to avoid deformations during linear expansion of the metal, movable ("floating") clamps are used. Double standing seam is performed using special frames: frame No. 1 is used for the first pass when closing a double seam, frame No. 2 - for the second pass when closing a double standing seam. After laying the coating on one slope, it is cooled in the same order on the adjacent slope. After that, ridge bends are made (30 and 50 mm wide), followed by a standing fold on the ridge. Rib folds on hip roofs are also made in the same way.

Sealing the seam with a seal Pre-compressed sealing tape for seam sealing (PSU/1)

is an indispensable element for sealing joints of various thicknesses.

width: 8 mm, opening: 20 mm (compressed - 4 mm)

If ventilation elements of the under-roof space are not provided, a ventilated ridge is arranged. The gable overhang should hang from the crate by 40-50 mm.

A very important element of the roof is the collar. chimney. This is the weakest link in a steel sheet roof. So that when assembling the upper and lower aprons with side aprons, no gaps form at the transition points of the vertical fold to the inclined one and the collar does not leak, you need to carefully take measurements in kind and correctly follow the technological instructions.

Clamps are movable and rigid

1) movable clamps are used to compensate for changes in the length of the picture, due to

temperature expansion. They are used when covering the roof with paintings from 3 to 10 m long.

With a length of paintings over 10 to 16 m, long movable clamps are used; 2) hard clamps

are used for fixing pictures when covering the roof up to 10 m

It is recommended to use sheets of length for roofing, equal to the length slope, and in this way to avoid the installation of horizontal seam joints. The device of an ordinary covering of roof slopes, eaves overhangs, valleys and grooves should be made from pre-prepared paintings. The connection of paintings in the direction of the slope of the water should be done with recumbent folds. Seam roofing can be caused by folds placed across, which connect metal sheets. While the process of freezing and thawing occurs during the change of seasons, small particles of water fall under the lying seam, and subsequently expand and expand the joint, thereby violating the tightness. It is in such places that leakage will occur later and, possibly, corrosion will begin. In order to avoid an unpleasant situation with damage to the roof, sheets should be ordered along the entire length of the slope.

A seam joint is a one-piece, but not rigid, butt joint of thin metal sheets. The word "falz" comes from the German "Falz" and translates as "groove, gutter."

This type of connection is most widely used in roofing. The fact is that when joining sheets of metal, it is necessary to solve issues related to their thermal expansion.

Changing the geometric dimensions with temperature differences does not allow the implementation of a rigid hermetic connection. At the point of joining, a stress of the material arises, leading to its significant deformation. That's why in the best possible way mating is a seam connection.

Folding combines two roofing elements, the edges of which are pre-processed in such a way that when they are reduced, it is possible to obtain a fixing seam (Fig. 1).

Seams are of three types:

• recumbent;
• standing;
• angular.

Structurally, the seams are divided into two groups:

• single;
• double (variety - slatted folds).

When connecting the end edges of roofing sheets running across the slope, a recumbent type of fold is used (Fig. 2), and for side edges that are directed parallel to the roof slope - standing.

Lying folds are considered not quite reliable, therefore they are used less and less. In addition, the rolled roofing material can be cut to the full length of the pitch, eliminating the need for a cross joint. But, since this type of fold has not completely outlived itself, let's consider its design features.

The folded edge of the lying type is produced as follows (Fig. 3):

a) lay the canvas on the edge of the table for marking, upholstered at the ends with a corner. Then a line is applied along the bend line of the roofing sheet. The width of the bend depends on the thickness of the sheet - the thinner the tin, the smaller the bend;

b) a wooden mallet or a rubber mallet perform a neat bend;

c) necessarily ensure the perpendicularity of the bend;

e) the edges of the two canvases are connected into a lock, which is pressed with a mallet;

f) using a hammer and a metal bar, cut the top sheet so as not to jam the seam seam.

standing seam

Single

This type of fold has the simplest design. It is used on roofs with a large slope (at least 10 °).

Installation procedure for a single standing seam:

1) from the side of the smaller edge, firmly press the scraper against the high edge. Adjust the scraper height to match the smaller edge. Bend the high edge to the surface of the scraper with a mallet. Remove comb.

2) close the low fold of the fold with a high one.

3) press the fold with a hammer and a comb bender bar, which is pressed tightly against back side seam connection (Fig. 4).

Double

Compared with single fold, double seam more reliable. Making it by hand can be difficult, but if you use special tools, such as seamers (Fig. 5), then you can do this job just fine.

Bending machines also greatly facilitate the work, with the help of which you can quickly and easily bend the edge to give it the desired profile. The double standing seam is the most commonly used method for joining two adjacent roof sheets. A seam roof is one of the most common types of roofing.

The manufacture of this seam connection begins with the creation of a corner standing seam, after which it is bent down 90 °. To compensate for temperature deformations, a gap of 3 to 5 mm wide is left at the base of the folded structure.

Since in order to obtain a double profile it is necessary to increase the number of working operations, the installation time of the roofing increases accordingly. But these inconveniences are fully compensated by the reliability of a thoroughly closed seam - after all, it ensures the hermetic integrity of your roof during precipitation.

However, even such a strong joint will not save from stagnant water on the roof, therefore the use of a double standing seam is only permissible on roofs with a slope of 10 ° or more. It is believed that a special sealant can help the case - a tape that is inserted into the fold before it is crimped by a seaming machine.

Rack

This type of connection of roofing sheets is more typical for European housing construction, although, recently, rack seam (Fig. 6) is gaining popularity among Russian roofers.

The lath fold in its essence resembles a double vertical fold, but, unlike it, has a wider joint edge due to the use of a wooden bar.

The bent parts of the roofing sheets rise along the sides of the bar and are attached either here (Belgian version) or on the surface of the bar (German version). The peculiarity of the use of such a seam connection is that it can only be used on roofs with a slope of more than 3 °, otherwise the water accumulated on the surface will penetrate into the under-roof structures.

Angular

Due to the volume and shadow cast by it, this seam connection looks quite elegant, which is why it is traditionally used for finishing large and well-viewed surfaces. It is typical for the installation of roofs with a large slope. Fixing the fold occurs in just one action. The design feature of the corner seam prevents stress in the metal, which means that deformations of the roof surface are minimized.

Russian specialists have developed a unique seam fastening scheme - a self-latching fold (Fig. 7). This invention is superior in manufacturability to all foreign analogues. The use of a “latch” saves the time of roofing installation and does not require special folding equipment.

There are two shaped profiles on the roofing sheet, made in such a way that one of them acts as the base of the latch, and the second plays the role of its cover. The latch cover profile of one leaf is snapped onto the base profile of the other leaf by a simple push from above. Thus, a strong and reliable seam lock is formed. You will spend only a few seconds on snapping the lock system. And this means a noticeable reduction in the time required for the installation of the entire roof.

The advantages of the fold - "latch" include:

• water resistance of the lock connection: no additional sealing is needed;
• ease of assembly and disassembly of roofing sheets: professional skills are not needed, and you can do without a special tool;
• a single panel for the entire roof slope, without additional joints;
• insensitivity to thermal expansion of the metal, which eliminates the deformation of roofing sheets;
• affordable price roofing material and installation works;
• roof installation speed;
• special connection strength.

Seam roofing is incredibly popular in low-rise construction. It is recognized as simple, reliable and quality construction. Affordable price also plays an important role. If you are the owner of a private house - perhaps this was your choice. We would be grateful for your story about how you covered the roof and what type of flange connection you used when installing it.

Metal has been used as a roof covering for a long time - it is durable, non-flammable, plastic and easy to use. Modern technologies significantly expanded the range metal coatings: for rebate systems today they use rolled and sheet galvanized steel, steel with a protective polymer coated and etc.

Seam roof got its name due to a special method of fastening metal sheets roofing material with each other. The special joint system guarantees absolute tightness without rubber seals, adhesive seams, and most importantly - through holes that can cause leaks. In addition, the stiffening ribs obtained during the folding process give the roof additional strength and expressiveness.

Pictures and folds

In order for the seam roof to be a continuous covering for the entire length of the slope, individual sheets are combined into pictures with the help of a seam lock, and they, in turn, are fastened to each other. What is a picture and a fold?

Painting- a roof element, the edges of which are prepared for connection.

Falz — special kind a seam formed when joining sheets of metal roofing material. There are several types of folds: single, double, recumbent and standing. Lying folds are used for horizontal connection roofing sheets, and standing ones - for fastening vertical (side) strips of roofing material.

The folds are performed (rolled up) manually with a special tool or in a more modern way - with electromechanical seaming devices. Self-locking folds hermetically connect roof sheets without the use of tools. But the most reliable is considered a double standing fold. It is this type of seam that is most often used on seam roofs abroad.

Modern equipment for rolling seams allows you to make paintings of any shape: conical, radius and others, so seam roofing is suitable for roofs of various configurations. In this case, the seam can have a thickness of 5 mm and a height of 30-70 mm, depending on the slope of the roof.

In valleys, the folds of one slope should be at the same levels as the folds of the second slope

Pros and cons of seam roofing

Benefits of seam roofing:

• the absence of fastening elements on the surface (in particular, transverse joints when creating a roofing card of any length), which eliminates leaks; the use of special seams that make the roof airtight;
• low weight of the roofing material, which does not require a reinforced truss system;
• durability;
• not flammability;
• flexibility to cover roofs of complex geometric shapes;
• ease of repair.

Disadvantages of seam roofing:

• smoothness of the surface, contributing to the avalanche of snow;
• high heat capacity, leading to the formation of icicles;
• low impact resistance.

Seam connection is considered one of the most reliable, as it does not require the use of through fasteners

Seam roof materials

galvanized roofing steel - one of the most popular roofing. It is a steel sheet coated on both sides with a layer of zinc. The material is light, relatively inexpensive, easy to work with and suitable for roofs of complex configuration. However, such a roofing coating has its drawbacks: under the influence of natural atmospheric factors, zinc is oxidized and weathered, which reduces the service life of the entire coating.

Steel with a protective polymer coating(pural, polyester, plastisol) lasts longer, and in addition, it also has decorative properties. It is quality and durable material with a multilayer structure, each element of which performs its own function. It's important to know that different coatings affect the properties of the material in different ways: polyester increases resistance to UV radiation, pural - to negative natural influences and temperature changes, and plastisol makes the roof especially durable.

The surface can be of any shape, the main thing is that its slope is at least 10 °

Aluzinc— more new material, which is a thin steel sheet protected not by pure zinc, but by an alloy containing 55% aluminum, 43.4% zinc and 1.6% silicon. By corrosion resistance this alloy is 6-8 times superior to conventional zinc. For expansion color palette polymers are also applied to the aluzinc coating.

copper roof is considered not only the most reliable and durable, but also the most beautiful. In addition, it does not require operating costs (table). Usually, a tape made of an alloy with a copper content of 99.9% is used for this type of roofing. Due to the plasticity of copper, it can be used for laying roofs of any shape. The necessary additional elements are also made from it, starting from drainage system and ending with ridge decorations. When working with it, there is practically no waste. Copper lends itself well to welding, which makes coating repairs simple and reliable. The time-tested method of soldering (or tinning) is also used, in which tin is used.

Of all the metals used to make roofing sheets, copper is considered the most reliable and durable.

It is important to consider that the presence of mechanical damage does not require the replacement of the entire sheet or strip - it is enough to cut out the copper patch and weld (or solder) the seams. After 12-15 years of operation on copper roof a green patina appears. Since objects covered with patina are traditionally associated with the image of noble antiquity, there are even special formulations, allowing to significantly accelerate the process of formation of patina on a copper roof.

The ribs formed by the folding system ensure the direction of rain and snow along the longitudinal lines, eliminating lateral runoff

pure zinc at present, they are no longer used for roofing (due to the complexity of manufacturing curvilinear elements). But it was replaced by a new alloy, called titanium-zinc (modified zinc or D-zinc). For its production, a complex of alloying additives from titanium, copper and aluminum is introduced into zinc.

Copper and aluminum give the material the necessary plasticity, and titanium increases corrosion resistance.

Seam roofing is arranged on a crate or a solid base

Possessing high consumer qualities, titanium zinc also has some features. Its coefficient of linear expansion is approximately 30% greater than that of steel. Therefore, in those climatic zones, where in summer period hot and cold in winter roof structures made of titanium-zinc, it is necessary to provide for expansion gaps.

It is necessary to remember one more feature of titanium-zinc: upon contact with iron and copper, it forms galvanic vapors, resulting in the effect of electrocorrosion. Therefore, when installing roofs and gutters, it is necessary to ensure that titanium-zinc parts are isolated from contact with copper and iron products. In particular, it is recommended to use only galvanized steel nails for fastening to the crate. This material is suitable for installation on a solid base of roofs of any configuration with a slope of at least 5%.

aluminum roof possesses high durability, color fastness, is practically not subject to atmospheric influences. For laying roofing aluminum, like copper, is produced in rolls. It is distinguished by relatively low weight (about 2 kg / m2), which allows the material to be used on almost all roof battens. Especially effective is the use of aluminum roofing together with the now popular metal siding for cladding the walls of buildings. As a result, it became possible harmonious combination material and shape of the roof, facade and entrance group. You can buy roofing iron in a wide range at any building supermarket or from an enterprise specializing in roofing.

Creating a seam roof is not an easy process, but the result is worth it

The nuances of the roof structure

For ordinary roofing, steel with a thickness of 0.5 mm is usually used. For slopes, eaves and gable overhangs, details downpipes it is better to use thicker steel - 0.6 mm. Each roofing material is recommended for a specific roof pitch.

The fastening system concealed under the seam guarantees no roof leaks and no need for through holes

It is better to arrange a seam roof on a roof with a slope of at least 10 °. Its creation is difficult process. If at home cold attic sufficient ventilation attic space. If the roof is insulated, the roofing “pie” above the insulation layer should include a ventilation gap and a special anti-condensation diffusion membrane.

Ready-made paintings with curved edges, created on the ground, are raised to the roof

The folded roof is arranged on a crate or a solid base. Used as a crate wooden bars with a section of 50 x 50 mm, which are installed perpendicular to the rafters in increments of 250 mm. With a larger pitch of the battens, the steel sheets can bend, which will cause deformation of the seams and lead to roof leakage.

Clamps are used in the work - special fasteners with which the paintings are mounted on the crate

Seam roof installation rules

The installation of a folded roof does not provide for fastening through a sheet of metal, so the roof is obtained without technological holes. The paintings are connected to each other along the edges, and fastened to the crate with the help of clamps. This is convenient if the width of the sheets from which the picture is assembled is 50-60 cm. The most common size of a galvanized sheet is 1 x 2 m, so it is cut lengthwise into two equal strips, 0.5 x 2 m in size. Steel sheets must be cut with scissors or a guillotine, but in no case with a grinder. Then required amount sheets (it depends on the length of the slope) are connected into a picture using recumbent folds. Bend the folds towards the slope of the roof.

When installed in different occasions use either hammers or a seaming machine (mechanized fasteners)

Parts for fastening are cut from a steel sheet - clamps(strips 50 wide and 150 mm long). These preparatory work perform on the ground. You can reduce the duration and labor intensity of the process by purchasing ready-made factory-made roofing sheets. They locks are guaranteed to be even and the same size.

After that, clamps are nailed vertically on the roof, in increments of 50 cm. The paintings are lifted to the roof, the free end of the clamp is brought into the side lock, with which they are connected to each other, and rolled up with a double standing seam.

Bad example. On raw steel sheets corrosion forms over time, so they must be protected - either with a special coating (at the factory) or by painting (after installation)

To perform this operation manually, only two hammers and fasteners are required, and for mechanized fastening, the hammers will be replaced by a special seaming machine. This mounting technology allows not only to connect the parts of the roof, but also to attach them to the roof.

§ 1. General concepts. False connections. Welt seams.

Standing, corner, bottom folds. Standing, lying folds.

Seam connection is the connection of two sheet blanks with bent edges tightly pressed against each other. The connection belongs to the type of one-piece, since it cannot be disassembled without violating the integrity of at least one part.

Seam joints are used relatively rarely. They have been superseded by more advanced assembly methods - welding and gluing. The exception is the production ventilation systems various ducts and containers.

By design, seam seams are divided into single, double, combined and corner, and by appearance - into standing and lying.

On fig. 142, a-m shows folded seams. The simplest of these types of seams is . Such seams are usually used as closing and longitudinal seams of air ducts, as well as in products that do not require high density and strength.

Rice. 142. Seam seams:

a - single recumbent, b - double recumbent, c - one and a half combined, d - single standing, d - double standing, e - single angular, g - angular combined, z - rack, and - simple bottom, k - bottom to landfill, l, m - bottom point-blank

Combined (one and a half and double) folds are applied where increased requirements to density and durability are imposed. Due to the difficulty of execution, a double fold is much more difficult than a one-and-a-half fold, therefore, in production, a one-and-a-half fold is often preferred.

Standing seams are mainly used for cross-connection of air and ventilation elements of systems. At the same time, the standing seam gives the systems additional rigidity.

Corner rebates used in the manufacture of rectangular elements of air and ventilation systems.

Bottom folds used to connect the shells and bottoms of tanks, cylindrical and conical dishes, etc.

Seam joints are used for fastening thin-sheet materials with a thickness from a few tenths of a millimeter (tin) to 1-2 mm.

On fig. 61 shows seam joints used for joining thin-walled pipes and shells.

The most common connection (Fig. 62) with flanging of the edges of parts (view a), the formation of a lock (view b), bending and flattening the lock with the formation of a four-layer seam (view c).

Types d-f - folded connection with a strip overlay sheet material, types w-l - reinforced seam connection with a six-layer seam (one-and-a-half fold), types m-p - connection with a seven-layer seam.

On fig. 62 shown seam joint designs used for fastening flat sheets and forming longitudinal seams of cylindrical shells.

On fig. 63 shows the methods of seam attachment of bottoms and covers to cylindrical shells.

Designs (a, b) are used to connect relatively thick-walled products (0.5-2 mm).

Tin products are joined by folding to form a three-layer (types v-m), four-layer (types n-p), five-layer (types p-m) or seven-layer (types y-h) seams. The seam is flattened on last operation with an emphasis on the central mandrel, driven into the recess of the bottom.

The most common folding type p-m.

On fig. 64 shows a diagram of mechanized seaming of such joints on rotary multi-position seaming machines. Seaming is carried out in cartridges, consisting of a central mandrel 1 and seaming rollers 2, 3, making a planetary movement around the product. Usually, two rollers are used, diametrically located along the periphery.

The initial stage of the operation is shown in view a. The rolled cover is supplied with pre-rolled edges: the edges of the shell are pre-flared.

First, rollers 2 of the first operation (view b) are brought to the product, forming a seam, then rollers 3 of the second operation (view c), flattening and sealing the seam.

The rollers of the first and second operations are usually installed in a checkerboard pattern on one cartridge. During the rotation of the rotor, the rollers are automatically approached and moved apart, first of the first operation, then of the second.

Multi-cartridge seaming machines operating according to the described scheme have a capacity of up to 500 products per minute.

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