Sailmaker sewing machine

Sailmaker’ job involve lie out, cut, assemble and repair sails that may be made from high tech textiles, such as carbon fibre, Zylon and Vectran, and by a lamination cloth as well as canvas. If you're going to start your sail making business, the first thing you'll need is a good industrial sewing machine.

Using the specialized sewing machine to ensure the panels are sewn together and heavy wear areas are reinforced with protective patches. 

General there are two types industrial sewing machines for sail makers and repairs: a basic heavy duty straight lockstitch sewing machine like (Cowboy #740 Top and bottom feed lockstitch sewing machine with large hook (, for detailed work and finishing, for example binding tape, sewing zippers & piping cords, attaching metal ring and straight stitching for day sailing, cotton sails, spray hoods, boat covers, interior & exterior boat upholstery etc. Most sail loft s have heavy duty zigzag industrial sewing machine like Durkopp Adler 166 or Adler 266-1, for sewing heavy corners, patches, attaching thick webbing, heavy duty canvas & sail work. The production of these machines stopped decade ago, you cannot find the new machine in today market, Sailmaster 9266 extra heavy duty zigzag sewing machine ( is the good replacement for sailmakers and repairs.
Adler 266-1 Type extra heavy duty zigzag

In modern sail making industry, triple zigzag (3-step zigzag) is necessary, so you need to have a cam-controlled zigzag industrial sewing machines, which has different cams for straight stitch, 1-step (2-point), 2-step (3-point) and 3-step zigzag (4-point), even 6-step zigzag. Durkopp Adler 72525 is the good sail maker sewing machine for sewing of light to medium weight materials, great for manufacturing and repairing surf sails, spinnakers, wetsuits, tents, awnings etc. But the price of this machine is too high to be affordable by most sailmakers. So many sail makers purchases the replacing machine Sailmaster 9518-30 long arm medium weight zigzag sewing machine (
Adler 525 type zigzag sewing machine for surf sails and spinnaker
For making large-surface sport sails, a long arm zigzag machine with large clearance was required. Durkopp Adler 366-76-12-HM is the specialized sail maker sewing machine for heavy sails. Before of high cost, many sail makers prefer to Sailmaster 9366-31HA High and long arm heavy duty zigzag sail making machine( This sail maker sewing machine is recognized as the ultimate sewing machine currently available, it out powers all other sail maker sewing machines, it is capable of powering its needle through 20mm of Dacron, Kevlar or leather, with its adjustable speed, pitch and zigzag action it can take on the largest sails you can imagine, described by the European sail makers as the Porsche of sewing machine, it is without doubt the strongest machine ever produced.

Durkopp Adler 366-76-12-HM type zigzag sail making machine. This heavy duty zigzag sail maker sewing machine is completely assembled and serviced (Ready to Sew), and deliver by large plywood crate. Customers just need to connect 220V electric and air compressor, before use.

 Anyway it is very important to get a right sewing machine for your sail manufacturing.

Watch sail making machine videos at youtube:

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Heat Sealing Coated/Laminated Fabric Seams

Dialectric Welding Vs. Rotary Welding

Generally made from a polyester or nylon internal fabric scrim and covered with a thermoplastic coating, industrial coated fabrics are used today for a vast array of important and interesting products. When manufacturing products from these fabrics, heat sealing machines apply a measured amount of heat and pressure to the seams of pattern pieces to fuse them together, making an airtight and watertight seal. Thermoplastic coatings, such as polyvinylchloride (PVC), polyurethane (PU), polyethylene (PE) and polypropylene (PP) lend themselves to heat sealing, eliminating the need for sewing, taping, gluing or other more complicated and costly methods. Tents, awnings, tarpaulins, inflatable boats, water toys, geo-membranes, truck covers, farm building covers, fishing waders, environmental and protective garments, and inflatable advertising balloons are just a few of the common products made today from industrial coated fabrics using heat sealing machines. There are two basic types of heat seal machines in common use today, the dielectric or radio frequency (RF) welder and the rotary heat sealer. Dielectric welder was developed over 40 years ago. It is a discrete process where a die is lowered onto the pattern pieces which are supported by an underlying base plate and then a timed pulse of radio frequency energy is delivered between the die and the base plate. The energy heats the fabric between the die and base plate enough to temporarily melt the thermoplastic coating, thereby fusing the two pattern pieces together. Once fused, the die is lifted, a new section of fabric is moved into position, and the process is repeated. The younger of the two processes, rotary welding (like MASTERBUILT S700 hot air welding machine for inflatable products) is more widely used today than dielectric. It is a continuous process where the pattern pieces move continuously through the weld area, generally pulled along by a pair of drive wheels. Heat is delivered from some source, either a heated metal wedge or hot air, immediately before the fabric passes between the drive wheels where the welding pressure is applied. There are several important differences between the dielectric and rotary welding process: Rotary Welding is Faster Rotary welding is much faster than dielectric welding for most products. This difference is greatest where seam length and product size are greater than about a meter and increases accordingly with larger size products and longer seams. Typical welding speeds up to 20 feet (6 meters) per minute and higher are attainable. 

Rotary Welding Requires a Skilled Operator While little training is usually required to operate a dielectric welding machine, rotary heat sealing is a skill, similar to sewing, and a longer training cycle can be expected before the full speed and flexibility of rotary heat sealing can be realized. Rotary Welders Can Produce 3-D Products Rotary welders can be used to produce three dimensional finished products (products that do not lie flat) such as garments, inflatable boats, bags, packs and luggage. Due to the flat base plate, dielectric welding is typically limited to products whose seams must lie flat during the sealing process or where the curvature is so small that the pieces can be laid flat. Note: Some specialized dielectric welders incorporate three dimensional dies and base plates and vacuum systems for holding the pattern pieces in position while the dies are applied. However, because of the high cost of these machines and especially the associated tooling, they are typically used only for certain, very high volume applications. Rotary Welding is Adaptable Dielectric welding is good for making many small, flat seamed welds, each exactly like the other. A rotary welder can be used for a variety of seam types and pattern designs with little or no setup change required. Rotary Welding Requires No Tooling Other than a selection of appropriate drive wheel widths and air nozzles to match them, rotary welders do not require dies or other tooling. This makes production set up much faster than with dielectric welding, a huge benefit in the product development cycle. 

 Wedge Welding Vs. Hot Air Welding ( There are also important differences between rotary wedge welding and rotary hot air welding. Typically, hot air is a much faster welding process that hot wedge. A wedge welder uses a small metal wedge to deliver heat to the fabric immediately before it passes between the drive wheels where pressure is applied to seal the fabric together. The advantages of the wedge welder are that it uses less power and is relatively quiet compared to the noise of the airflow from hot air welders. Hot air welders use a hot air nozzle instead of a metal wedge to deliver heat. This simple difference gives the hot air welder several distinct advantages. Heat Build-up Hot air welders are not subject to the heat build-up experienced when stopping and starting a wedge welder. Whenever the seaming process is interrupted or stopped, the heat in the wedge builds up. When the wedge is reintroduced to the fabric for seaming, it can often burn the fabric at the start point. Uniform Heat Transfer Contamination on the surface of the wedge can block the transfer of heat from the wedge to the fabric, affecting the uniformity of the weld. This contamination can come from two sources: dirt on the fabric, picked up during the material handling process, or bits of melted coating that adhere to the wedge while welding. Since hot air welders use air rather than metal to deliver heat, they are not subject to this problem. Surface Irregularities Irregularities on the surface of the fabric being welded, particularly a cross seam, raise the wedge as it goes over the irregularity. On the back side of the irregularity, this momentarily leaves the rigid metal wedge too far above the bottom piece of fabric to ensure a good weld. Since hot air is not rigid, it can flow over surface irregularities, ensuring a better weld. These advantages make the hot air welder more versatile than the wedge welder. While the wedge welder is suitable for welding relatively simple products made from less technically advanced fabric that have few or no cross seams, the hot air welder is used in a much broader field of applications with more advanced design and fabrics.