Jacket pressing bucks are the anatomical surfaces that touch the fabric directly on the press and give suits and jackets their three-dimensional shape.

This guide was prepared by Malkan Machinery Corporate Communications for the production, quality, maintenance and purchasing teams of garment manufacturers. Its aim is to base every decision, from buck selection to maintenance, on measurable technical criteria.

The quality of a jacket becomes visible mainly at final pressing: a clean shoulder line, a neatly set armhole and a soft lapel roll are the details a customer notices first. Poorly chosen or badly maintained jacket pressing bucks can downgrade even a well-sewn garment to second quality through shine, seam impressions and bagginess.

Shape is created by a controlled combination of moisture, heat, pressure and time, and it is fixed by vacuum. Jacket pressing bucks are the interface through which these four variables reach the fabric; if the buck is wrong, even a perfectly adjusted press will not deliver the expected result.

For this reason, the buck decision is one of the first items to review when setting up a new line, changing a model or analysing quality complaints.

1. WHAT IS A JACKET PRESSING BUCK? HOW IT DIFFERS FROM A GARMENT PATTERN AND FROM THE PRESS

Malkan Machinery jacket pressing bucks.

Two different tools are easily confused when people talk about shaping a jacket. A garment pattern is the flat template that defines the cutting geometry of the fabric pieces. A pressing buck, by contrast, is the three-dimensional surface on which the garment rests during pressing and through which steam and vacuum pass; this guide is about the second.

A jacket pressing machine consists of a frame, a pneumatic or hydraulic motion mechanism, steam and vacuum valves, and a control system. The buck is the part of this system that touches the fabric: the lower buck carries the garment, while the upper buck closes down and applies pressure and heat from above.

Jacket pressing bucks are therefore not an accessory of the press but a functional component that directly determines the quality of the result.

The lower buck usually has a hollow steam chamber and a pattern of perforations on its surface. Steam passes through these holes into the fabric; when vacuum is applied, the same holes draw moisture and heat back in the opposite direction. The upper buck is usually heated, and some types carry their own steam outlet.

The distinction between jacket pressing bucks and the press also matters in purchasing. The same press frame can serve different model families with different buck sets, whereas an unsuitable buck makes even the most advanced control system inefficient.

That is why jacket pressing bucks should be evaluated together with the choice of press, yet as a separate technical topic.

The geometry of jacket pressing bucks is derived from the garment pattern and from the intended fit of the finished garment. Shoulder slope, chest fullness and armhole depth are transferred to the buck surface in three dimensions.

When the fabric rests on this surface, it softens with moisture and heat, and as vacuum cools it, it takes on the shape of the buck.

2. THE ROLE OF BUCKS IN INTERMEDIATE AND FINAL PRESSING

In jacket production, pressing is not a single station but a process spread along the sewing line. Intermediate pressing opens seam allowances between sewing stages, lays edges flat and prepares the part for the next operation. Final pressing gives the assembled garment its finished shape and determines how the product will look on the shop floor.

The jacket pressing bucks used for intermediate pressing are mostly narrow and long; when opening sleeve seams, the centre back seam and side seams, they ensure that the fabric is pressed only along the seam line.

With these bucks, the priority is to open the seam allowance without leaving impressions rather than to create shape. When intermediate pressing is done carefully, the need for corrections at final pressing drops significantly.

At final pressing, jacket pressing bucks work by zone: the front panel, back, sides, shoulders, armholes, collar and lapels are each pressed on a buck that matches their own geometry.

A seamless transition between zones depends on the buck set being designed to work together. The wrong shape on a single buck also shows up in neighbouring zones as bagginess or pulling.

The division of work between intermediate and final pressing depends on the product mix of the company.

In high-volume standard models, zone-based final pressing machines provide an efficient flow, while in multi-model, short-run production, intermediate pressing tables and hand-iron support play a larger role. Planning should reflect this balance in the investment in jacket pressing bucks from the start.

3. CORE BUCK TYPES FOR THE 8 ZONES OF A JACKET

Cross-section of a jacket pressing buck showing its layered structure.

This guide works through the eight basic zone-specific buck types that are widely used among jacket pressing bucks at final pressing. Classification and naming may vary by company, machine and model family. The table below summarises the task of each type and the critical point to check.

The front panel buck has the largest surface area among jacket pressing bucks, so this is where the hole pattern and the uniformity of the padding are tested most.

On the back buck, edge design is decisive: if the edge facing the vent area does not have a soft transition, a line-shaped impression remains on the fabric. The side buck acts as a bridge that connects the front and back shapes.

The shoulder and armhole are the most complex curved zones of a jacket. If the shoulder buck is not chosen according to the thickness and position of the shoulder pad, the shoulder tip collapses or puffs; on the armhole buck, insufficient depth flattens the sleeve head.

Paired jacket pressing bucks that work symmetrically for the right and left shoulders are common for this reason.

On collar and lapel bucks, the goal is to guide rather than to flatten. In classic tailoring, the lapel turns not along a sharp line but in a rounded roll; the buck must protect this roll without crushing it.

Sleeve bucks, with their narrow, long and curved form, press the seam lines without disturbing the cylindrical shape of the sleeve.

Not every company has all eight types as separate presses; some stations can process two zones together. Whichever layout is chosen, jacket pressing bucks should be treated as a set, and the transitions between zones should be tested together.

4. BUCK ANATOMY: BODY, STEAM CHAMBER AND COVER LAYERS

Jacket pressing bucks look like a single piece from the outside, but they have a layered structure.

At the bottom is the metal body that carries the shape, with the steam chamber inside; above it are flexible intermediate layers, and at the top is the cover that touches the fabric. Each layer has a different role in steam flow, pressure distribution and surface softness.

In the industry, the metal body of jacket pressing bucks is commonly made of cast aluminium or formed sheet steel. Aluminium stands out for good heat conduction and low weight, while steel may be preferred for its mechanical strength.

The hole pattern of the body is the foundation of the design, ensuring that steam leaves the surface evenly and that vacuum works with the same force across the whole area.

In most applications, the intermediate layer above the body is a metal spring wire mesh or a similar porous structure. This layer lets steam and air spread along the surface while keeping the padding away from the hole openings. This prevents spot-like marks resembling hole impressions from forming on the fabric surface.

The padding layer is chosen from flexible, heat-resistant materials such as silicone foam or felt, and it spreads the pressure across the surface.

If the padding is too hard, the risk of shine and seam impressions increases; if it is too soft, the shape loses definition. The right density depends on the weight of the fabric being pressed and the required sharpness of the shape.

The cover cloth on top must be heat-resistant, permeable to steam and resistant to wear. Aramid-based weaves and similar technical fabrics are widely used for jacket pressing bucks. A cover with low steam permeability traps moisture, which can cause condensate to build up on the surface and lead to water marks.

A similar layered logic applies to the upper buck surface; here, heat conduction and the ability of the cover to prevent shine come to the fore.

On wool fabrics, choosing the right cover is decisive to ensure that the upper buck does not create shine on direct contact. When buying jacket pressing bucks, it is also worth asking about the lead time for spare cover and padding sets.

Summarised from bottom to top, the layer sequence is: steam inlet and vacuum outlet connections, steam chamber, perforated metal body, spring wire mesh, padding or felt, cover cloth, and finally the fabric being pressed. Wear or clogging at any link in this sequence reduces the performance of the entire chain.

Malkan Machinery uses materials such as silicone, padding and technical fabric in the cover layers of the jacket pressing bucks it manufactures. The hardness and thickness of the layers are determined according to the fabric group the buck will work with and the intensity of use.

5. HEAT, MOISTURE, PRESSURE AND TIME: HOW DOES SHAPE BECOME PERMANENT?

The shape-setting cycle in jacket pressing.

Under the effect of moisture and heat, wool fibres temporarily become able to change shape; the hydrogen bonds in the keratin structure of the fibre loosen, and the fabric adapts to the shape of the buck.

When the moisture is then removed and the temperature drops, the bonds re-form in their new position and the shape is set. The shape of a pressed jacket relies largely on this "soften, shape, set" cycle.

In practice, the cycle follows four steps: steaming, shaping under pressure as the press closes, a second steaming if required, and drying and cooling with vacuum.

The duration of each step is defined in the recipe and varies by fabric type. Shortening the times may increase capacity, but an insufficient vacuum time can cause the shape to spring back within a short time.

Pressure is needed for the fabric to sit fully on the buck surface, but too much of it flattens the fibres and causes shine.

In pneumatic presses, pressure is determined by the setting on the air line and by the cylinder design; keeping the line pressure stable is therefore important. The padding layer on jacket pressing bucks plays a direct role in spreading the pressure evenly across the surface.

Temperature is controlled by the heating system of the upper buck and by the steam itself. Wool fabrics generally tolerate higher temperatures, while polyester and other blends with synthetic content should be pressed at lower temperatures; thermoplastic fibres shine or harden under excessive heat. Exact values are set according to the fabric manufacturer's recommendations and trial pressing.

Moisture control is the most frequently overlooked variable in the process. The drier the steam that reaches the fabric, the more evenly the moisture is distributed and the less likely water droplets are to form on the surface.

Insufficient removal of moisture from the fabric during the vacuum stage is one of the main reasons why a garment loses its shape on the hanger or in the package.

The document in which these four variables are recorded for each fabric and model is called a recipe. In presses with a programmable control system, the recipe is stored as step times and the steam and vacuum sequence, and it is recalled with a single selection when the model changes.

Jacket pressing bucks and recipes belong together; the same recipe will not give the same result on a different buck.

6. COMPATIBILITY WITH FABRIC, INTERLINING AND LINING

A jacket is made not of a single fabric but of layers: the outer fabric, fusible interlining on the front panel and, in most models, a chest canvas, with the lining on the inside.

Buck and process settings affect all of these layers at the same time. When choosing jacket pressing bucks, therefore, the entire inner construction must be considered, not only the outer fabric.

The adhesive on fusible interlining is a heat-activated polymer. If temperature and pressure are kept higher than necessary at final pressing, the adhesive can soften again; as a result, bubbling, waviness or separation may appear between the interlining and the fabric.

Fusing is a separate operation and should be carried out on dedicated fusing presses with its own parameters.

Linings are usually made of thinner and more slippery fabrics such as viscose, cupro or polyester. Because the heat sensitivity of the lining may differ from that of the outer fabric, temperature must be set carefully on the zones of jacket pressing bucks that touch the inner surface.

On garments with slippery linings, the ability of the vacuum to hold the garment in place on the buck also becomes particularly important.

Fabric weight and weave also change the processing behaviour on jacket pressing bucks. Heavy, densely woven wool fabrics may require longer steam application, whereas light summer fabrics take their shape in a short cycle and may ripple under excessive steam.

On stretch fabrics containing elastane, the fabric resting on the buck without being stretched is decisive for dimensional stability.

The most reliable confirmation of compatibility between the fabric and jacket pressing bucks is trial pressing before series production. A sample garment is processed with the defined recipe and checked for shine, impressions, sharpness of shape and dimensional change.

These results are entered into the recipe, so that the settings do not have to be searched for from scratch when the same fabric arrives again.

7. BUCK SELECTION BY MODEL, SIZE AND CUT

Malkan Machinery jacket pressing buck.

Jacket pressing bucks are selected according to the character of the model to be produced. A classic jacket with shoulder pads and a pronounced shoulder structure and an unpadded, soft-shouldered model will not give the same result on the same shoulder buck.

On slim-fit models the waist and side curves determine the buck geometry, while on relaxed-fit models chest and back volume do so.

The size range is the second key criterion. A single buck cannot be expected to cover the entire size scale equally well; for this reason, companies create size groups for jacket pressing bucks or work with adjustable bucks.

A mismatch between buck and size appears as excess fabric and wrinkling on small sizes, and as pulling and impressions on large sizes.

There are also clear differences between women's and men's jackets. Since chest curve, shoulder width and waist proportion differ in women's jackets, the front panel and side bucks often need to be designed separately. Companies that process both groups on the same line should include buck changeover time in their capacity plan.

The speed of buck changeover is a hidden driver of efficiency in multi-model production. Quick-release fasteners, standard steam and vacuum connections and a lightweight body on jacket pressing bucks shorten model transitions.

Building a buck library for jacket pressing bucks, in which each buck is matched to a model, size group and recipe, reduces the risk of using the wrong buck.

During selection, the mechanical and utility compatibility of new jacket pressing bucks with the existing press frame must also be verified.

If the connection dimensions, the steam and vacuum entry points and the closing geometry of the upper buck do not match, pressure imbalance occurs at the buck edges. This check should be carried out together with the machine manufacturer before purchase.

Four questions, answered in order, can simplify the selection:

1. Processing zone: Which zone of the jacket will the buck press: front panel, back, side, shoulder, armhole, collar, lapel or sleeve?
2. Model construction: Is the jacket padded or unpadded, slim-fit or relaxed-fit?
3. Fabric: Is the fabric wool, synthetic, a blend or elastane-based, and what are the interlining and lining structures?
4. Existing press: Are the selected jacket pressing bucks compatible with the mechanical connection of the press, its steam and vacuum inlets and its closing geometry?

8. TECHNICAL INFORMATION TO PREPARE BEFORE PURCHASING

The efficiency of a supplier meeting about jacket pressing bucks depends on how clear the data brought to the table is.

A selection made with incomplete information leads to mismatches noticed only after the buck has been installed on the line, and to additional correction costs. The list below groups the basic data that should be shared with the machine manufacturer.

• Press information: The make and model of the existing press, buck connection dimensions, the connection structure of the upper and lower bucks, and the steam and vacuum connection types.
• Product information: The jacket model family to be processed, the size range, zones to be pressed separately and points that require special curves.
• Material information: Fabric composition and weight, interlining type and lining structure, and where possible the fabric manufacturer's pressing recommendations.
• Production information: Target quantity per shift, model changeover frequency, and the split of women's and men's garments to be processed on the same line.
• Support expectations: Requests for sample pressing, needs for spare covers and padding, and lead times for service and spare parts.

This list is not an obligation to fill in a form; it makes visible the decision data that reduce the risk of choosing the wrong buck. Sharing the data in writing ensures that both parties work with the same assumptions during the quotation stage.

The purchasing decision should not be based on the initial price alone. The total cost of ownership of jacket pressing bucks also includes the consumption of spare covers and padding, fasteners, maintenance and service costs, the time spent on model changeovers and the losses caused by unplanned downtime.

Tracking these items over the life of the buck reveals the real difference between two quotations.

Standard jacket pressing bucks cannot cover every situation; the need for a custom buck usually arises where standard geometry is not enough. Special models with a pronounced shoulder structure, unusual size ranges or unconventional fabric combinations are examples.

In such cases, sharing the sample garment and the garment pattern with the machine manufacturer is the starting point for deriving the right buck geometry.

Malkan Machinery makes custom jacket pressing bucks for existing presses. Such work requires the connection dimensions of the press, its steam and vacuum inlets, its closing geometry and the model family to be processed to be considered together.

9. TRIAL AND ACCEPTANCE OF A NEW BUCK

Jacket pressing station with a buck.

Following an acceptance procedure when commissioning new jacket pressing bucks prevents problems from being carried into series production. The aim of the procedure is to approve the buck not on the basis of a single successful sample but on repeatable results. The flow below is a general framework and can be adapted to the company's quality system.

1. The reference model, fabric and size are defined, and the current recipe is recorded.
2. The buck is mounted; the mechanical connections and the steam and vacuum connections are checked for leaks.
3. During an empty run, the even release of steam across the surface and the suction of the vacuum over the whole area are observed.
4. Sample garments are processed with the defined recipe.
5. Surface shine, seam and edge impressions, right-left symmetry, sharpness of shape and dimensional change are checked.
6. The shape retention and drying behaviour of the garment after it has cooled on the hanger are evaluated.
7. If necessary, the recipe is revised by changing one variable at a time, and the trial is repeated.
8. The acceptance result is entered on the buck card together with the buck, model and recipe information.

Acceptance criteria for jacket pressing bucks should be defined in measurable terms wherever possible. The main criteria include the acceptable level of surface shine, dimensional tolerance, shape spring-back, buck surface temperature, vacuum performance, cycle time and repeatability between samples. The numerical limits are set by the company according to the product group, the fabric and the customer specification.

When assessing jacket pressing bucks, carrying out the checks under the same lighting conditions and side by side with a reference sample reduces subjective judgement. It is advisable to inspect the garment from different angles when checking for shine, and to measure at the same points before and after pressing when checking dimensions.

10. COMMON DEFECTS AND THEIR SOLUTIONS

A large share of the defects seen at final pressing stems from a mismatch between jacket pressing bucks and the process parameters. The table below summarises the defects most frequently encountered on lines working with jacket pressing bucks, together with their possible causes and first corrective steps.

In defect analysis, especially for problems caused by jacket pressing bucks, changing one variable at a time is the key to a correct diagnosis. If pressure and temperature are changed at the same time, it is impossible to tell which setting improved the result; every trial should be recorded and entered into the recipe.

Recording in which zone and how often a defect occurs also speeds up diagnosis. An impression that recurs at a single station usually points to the cover or padding of that buck. Water marks appearing across the entire line at the same time, on the other hand, indicate that the steam infrastructure needs to be examined.

11. STEAM AND VACUUM INFRASTRUCTURE

Jacket pressing bucks work only as well as the steam and vacuum that supply them. Even the best hole pattern on a buck surface cannot produce the expected shape if the steam arriving through the line is wet or the vacuum is insufficient.

The investment in bucks should therefore be planned together with the steam and vacuum infrastructure of the plant.

The target for pressing is steam that is as close to dry saturated steam as possible. In long, uninsulated lines, steam condenses and carries water droplets; these droplets pass from jacket pressing bucks to the fabric and turn into marks. Properly sized lines, insulation, steam traps and, where necessary, moisture separators reduce this risk.

Condensate drainage matters for both quality and efficiency. Condensate collecting in the steam chambers of jacket pressing bucks reduces heating performance and can cause water to spray onto the fabric during steaming. With a suitable plant design, returning the condensate to the boiler through a return line can help to reduce water and energy consumption.

The capacity of the vacuum system must match the surface area of jacket pressing bucks and the air permeability of the fabric.

In plants using central vacuum, the vacuum at each station may drop when several presses draw at the same time; this can adversely affect the removal of moisture and the setting of the shape. An independent vacuum unit per press or a central system with sufficient capacity reduces this risk.

The capacity of the steam source is selected according to the total consumption of the presses and other pressing points.

If peak consumption is not taken into account, pressure fluctuations occur during the shift, and pressing quality varies from station to station. Water softening and regular blowdown limit scale build-up in the boiler and in the holes of jacket pressing bucks.

12. MAINTENANCE, COVER RENEWAL AND THE BUCK CARD

Maintenance of jacket pressing bucks starts with regular checks of the cover and padding layers. Padding that has been crushed, has hardened or has thinned in places cannot distribute pressure evenly and causes local shine on the fabric; a worn cover, meanwhile, loses its steam permeability.

The inspection interval should be defined in the maintenance plan according to the intensity of use.

Keeping the holes on jacket pressing bucks open is essential for continuous steam and vacuum distribution. Scale from hard water and fibres shed by the fabric gradually narrow the holes over time. A properly functioning water treatment system and periodic surface cleaning largely prevent this problem.

When renewing the cover, stretching the layers in the correct order and without wrinkles is important so that the new cover does not leave impressions from day one.

Keeping spare cover and padding sets for jacket pressing bucks in stock prevents unplanned downtime during busy seasons. Replacement dates and the materials used should be entered on the buck card.

The buck card is the record that brings together the identity and history of each buck in one place.

It may include the buck code, the matching model code, size group, fabric family, recipe number, revision date, maintenance dates and cover and padding replacement dates. These fields are examples; each company adapts them to its own production planning and quality system.

A card system reduces the risk of fitting the wrong buck in multi-model production and allows maintenance intervals to be adjusted to actual usage data. A legible code label on jacket pressing bucks and a buck store organised by model family shorten search time during changeovers.

13. LINE LAYOUT, BUCK CHANGEOVER AND OCCUPATIONAL SAFETY

When jacket pressing bucks are arranged on the line, the basic principle is that the garment moves in one direction without going back. On many lines, the zones that define the inner structure, such as the armholes and shoulders, are pressed first, followed by the front panel, back and sides, and finally the collar and lapels.

The sequence is adapted to the company's model structure. When the lapels are pressed in the final stages, their soft roll is not crushed by later operations.

Hanger transport between stations prevents pressed zones from creasing again. Letting the garment cool briefly on a hanger after pressing so that it releases its remaining moisture also helps the shape to settle.

Which jacket pressing bucks will change at a model changeover, in which order the change will be made, and how the steam and vacuum connections will be disconnected and reconnected should all be defined in advance.

When changeover time is entered as a separate item in the capacity plan, delivery dates can be calculated more realistically. On lines with frequent model changes, completing the preparation part of the changeover while the machine is still running shortens downtime.

Because pressing machines work with hot surfaces, pressurised steam and moving bucks, occupational safety is an integral part of buck management. It should be verified periodically that protective devices such as two-hand controls and emergency stops are working at every station.

Before buck changeover and maintenance, steam, compressed air and electrical energy should be isolated and locked out, and jacket pressing bucks should be allowed to cool.

Maintenance and buck changeover should only be carried out by trained and authorised personnel in accordance with the instructions in the machine's operating manual. In the European Union, machinery safety is addressed under the Machinery Directive 2006/42/EC; from 20 January 2027, the Machinery Regulation (EU) 2023/1230 will apply.

14. Conclusion: jacket pressing bucks for lasting shape and repeatable quality

Jacket quality is determined as much in pressing as in fabric and sewing, and in pressing it is the buck that transfers the result to the fabric. Well-designed jacket pressing bucks deliver steam, heat, pressure and vacuum evenly to every zone of the garment and make the shape repeatable.

When a suitable buck, a standard recipe, a stable infrastructure, regular maintenance and operator training are applied together, the dependence of quality on the operator is significantly reduced.

When selecting jacket pressing bucks, model and size structure, fabric-interlining-lining compatibility, cover layers and machine compatibility should be evaluated together.

Data preparation before purchase, measurable acceptance criteria, a buck card and a spare parts plan ensure that the investment delivers the same quality in the long term. When defects appear, single-variable trials and recording discipline are the fastest way to a solution.

Malkan Machinery has been manufacturing ironing systems for the garment and ready-wear industry since 1971 and exports to 95 countries. Jacket ironing systems, jacket ironing presses and benches, and steam boilers are part of the company's product range; the company also manufactures custom jacket pressing bucks for existing presses.

15. Frequently Asked Questions (FAQ)

What is the difference between jacket pressing bucks and a jacket pressing machine? The press is the machine consisting of a frame, a motion mechanism, steam and vacuum valves and a control system. The buck is the anatomical surface on this machine that touches the fabric directly and gives the garment its shape.

Is a pressing buck the same as a garment pattern? No; a garment pattern is a flat template that defines the cutting geometry of the fabric pieces. A pressing buck is the three-dimensional surface on which the garment rests during pressing and through which steam and vacuum pass.

How many different buck types are used on a jacket line? At final pressing, the common classification is based on eight core zones: front panel, back, side, shoulder, armhole, collar, lapel and sleeve. Depending on the company's model structure, some zones can be processed together at the same station.

What materials are jacket pressing bucks made of? A common construction includes a cast aluminium or sheet steel body, a spring wire mesh intermediate layer, heat-resistant padding and a steam-permeable cover cloth. The choice of material varies according to the fabric being pressed and the intensity of use.

Can the same buck be used for different sizes? It can be used for neighbouring sizes, but a single buck cannot be expected to cover the entire size scale equally well. For this reason, size groups are created or adjustable bucks are used.

Can a new buck be fitted to an existing press? It can, if the connection dimensions, the steam and vacuum inlets and the closing geometry are compatible. This compatibility should be verified with the machine manufacturer before purchase.

When should the buck cover be replaced? Replacement is needed when the cover loses its steam permeability, when the padding is crushed, or when local shine and impressions start to appear on the fabric. The inspection interval is defined in the maintenance plan according to the intensity of use.

Why does shine appear on wool fabric? Shine occurs when fibres are flattened under excessive pressure or high temperature. Reducing pressure, checking the padding and cover, and bringing the upper buck temperature to a level suitable for the fabric usually solve the problem.

Do water marks come from the buck or from the steam line? Both can be the cause: wet steam and undrained condensate come from the line, while a cover with reduced steam permeability comes from the buck. For diagnosis, the steam traps and line insulation are checked first, then the condition of the cover.

What should be done to prevent interlining bubbling? At final pressing, temperature and time should be kept at a level that does not soften the interlining adhesive again. Fusing itself should be carried out on dedicated fusing presses with the parameters recommended by the interlining manufacturer.