Carrier-type heat-treatment apparatus

A carrier heat-treatment apparatus including a furnace main body that includes heaters and a mesh belt that transports an object to be heat-treated into the furnace main body, comprising:

• a gas pipe arranged inside the furnace main body, the gas pipe being configured to inject a gas into the furnace main body,
• wherein a low-temperature zone and a high-temperature zone are provided inside the furnace main body with the gas, the low-temperature zone being provided on an entrance side of the furnace main body, the high-temperature zone being provided on an exit side of the furnace main body and having a temperature higher than the low-temperature zone,
• wherein the heaters are aligned in a transportation direction of the object to be heat-treated,
• wherein a heat insulator is arranged in a gap that is selected from gaps between the heaters aligned in the transportation direction and that is located in the vicinity of the gas pipe, and
• wherein the gas from the gas pipe does not provide heat insulation within any of the gaps between the heaters aligned in the transportation direction.