Shoe Factory Equipment: What do I need to make shoes?
What machines are needed to manufacture sneakers?
What shoe factory equipment do I need to open a real shoe factory? I’m going to walk you through a mass production shoe factory and detail all the shoe factory equipment you will need to do it right. If you are looking for hand tools for shoemaking click here.
I’m going to show you what you need to make a standard die-cut cold cemented sneaker. This is a simple shoe made with only die-cut parts. The outsole is a one-piece rubber cupsole with a die-cut midsole inside and channel stitching.
First, modern shoe manufacturing relies heavily on sub-contracted factories for many specialized operations. For example, the shoe factory technicians developed the outsole designs, but the outsole tooling is produced elsewhere, with the rubber parts also purchased somewhere else from a company that specializes in rubber pressing. The shoe factory then controls the components to ensure the uppers and outsoles all fit together correctly.
Shoe Material Cutting and Marking
Inside the shoe factory, the first operations in the manufacturing process are the cutting and marking operations. The factory uses cutting presses, also called clicker cutting machines. The clicker press is one of the standard pieces you will see in every shoe factory, and they require cutting dies for each shoe pattern part.
New technology for cutting is the computer controlled drag knife cutter. These machines use a vacuum table to hold materials in place while the blade cuts all the pattern parts. This technology is critical for custom mass production. Once the shoe parts are cut they get processed, with alignment marks screen printed on the parts and any logos added. Logos can be silk screen printed, radio frequency welded, or embroidered on the cut parts.
Footwear logo application
After the shoe parts are cut and marked for assembly, they may need to have logos added. Logos are added by silk screen printings, embroidery, or heat welding.
Footwear upper stitching
The sewing machines come in many types: post, long arm, short arm, etc. The stitching line will have hundreds of these machines, the amount depending on the complexity of the shoe design. The style of the machine will also change to fit the specific operations required to make each shoe design.
Once the stitching is finished, it is time to set the shape of the toe box and heel counters. These machines heat the thermoplastic counters inside the toe and heel, then clamp the shoe to set the shape.
With the upper almost complete, we will need a special sewing machine to finish it. The Strobel sewing machine was invented by a guy named…you guessed it… Strobel! This machine is used to sew the bottom fabric onto the upper, closing it. The fabric bottom or “sock” is marked with alignment lines to ensure the upper is straight and not twisted. Now the upper is ready for lasting and assembly.
Shoe assembly process
With the shoe ready for assembly, it’s time to bring out the heavy equipment. The basic assembly line is about 100 yards long. On the front of the line, you will find a steamer to soften the shoe uppers, preparing them for lasting. The lasting machines are used to get the uppers pulled down tight onto the shoe lasts.
The toe lasting machine is the centerpiece of the lasting equipment. This machine takes hold of the upper and physically pulls it down around the last. The machine simultaneously pulls the upper into place while injecting hot glue to fix the uppers into place on the last. Once the toe lasting is complete, the shoes’ waist and heel may also be pulled into place by either hand operation or machine processes. Following the lasting operations, the lasted upper is placed into the first of the tunnels on the line. These tunnels are cooling tunnels that shrink the upper down to adhere the last even tighter.
Footwear Primer and Cement
Now the lasted uppers and outsoles are on the conveyor line together, each receiving two coats each of primer and cement. After each application, the parts are placed back on the line to travel through a heat tunnel to dry the parts.
Once the parts are fully primed and covered with cement it is time to join the parts together. A worker takes the upper and sole in-hand, fitting them together. Once the parts are fit, a pressing operation ensures the bonding surfaces are completely in contact.
The pressing operation compresses the bottom, sides, and heel of the sole and upper together. To set the bond, the lasted upper with the bottom attached is often placed in a chiller unit. Once out of the chiller unit, the shoe is de-lasted by hand or by machine. Depending on the design of the shoe, there may be just a few operations left. A possible process is for a shot to receive channel stitching from a special oversized sewing machine that can stitch through the rubber outsole and the entire upper.
Finally, the shoe may pass through a dryer oven and UV light tunnel to ensure there is no possibility of mold growth while the shoe is in transit.
To see this shoe factory equipment in action, read chapters 8, 9, and 10 of How Shoes are Made.