Heel Shaping Specifications
Process Parameter Guidelines
Heat Activation Process (Heat Mold / Hot Air)
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Working Temperature: 130°C to 160°C
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Pressing Time: 25-40 seconds (depending on equipment model, working conditions, and upper/lining material)
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Interface Temperature: Measured temperature between the heel and upper: 80°C-100°C
Cold Shaping Process
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Working Temperature: 5°C or lower
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Pressing Time: 25-40 seconds (depending on equipment model, working conditions, and upper/lining material)
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Interface Temperature: Measured temperature between the heel and upper: Must be below 40°C
Note: The lower the temperature of the component after cold shaping, the better the final shaping effect.
Cutting
The heel counters should be cut transversely along the widest width of the material. Multi-layer cutting is supported, with the number of layers depending on the material grade and the cutting equipment used.
Thinning (Slitting)
Slitting should be done on the reverse side of the material (opposite to the side facing up during cutting). To achieve the best results, it is recommended to use a rotary blade slitting machine and apply silicone-based lubricant or cool down the blade to prevent the blade from sticking to the material.
Pre-Lamination
Medium-temperature series products can be laminated with heel linings using appropriate lamination equipment. The use of hot melt adhesive for the lining provides the best results.
Pre-Shaping
To facilitate embedding and positioning, medium-temperature series products can be pre-formed, but the material must first be heated to 50°C-60°C. This temperature range allows the material to soften appropriately for shaping, while preventing premature activation of the hot melt adhesive, which could make the operation difficult.
Embedding Specifications
In the footwear manufacturing process, the CAYO team recommends sewing the edges of the heel part naturally to the upper. Using solvent-based adhesives to fix the heel position may negatively affect adhesive strength and shaping effectiveness.
Heel Molding
To achieve the best activation effect, it is recommended to use a heel molding machine equipped with a heated inner mold and airbag pressure device. Silicone pressure devices are also suitable.
For the best molding results, cold molds must be used. It is recommended to use cold molds at below 5°C combined with an airbag pressure device for cold shaping.
