ASO Co., Ltd.

 The polyethylene film is melted and welded by heat, and there are two main types of heat-sealing methods: the heat plate method and the impulse method.

 This method uses a nichrome wire embedded in a brass or copper heating plate to conduct heat to the heating plate, which is then pressed and adhered to the polyethylene tube (under the control of a thermostat).

 This method is to directly heat and weld the polyethylene tube for sealing with a nichrome wire.

 In other words, when the temperature of the heat plate drops, the thermostat detects this and switches on to generate heat, but the temperature does not immediately rise to the specified temperature, and a time lag occurs during this period.

 

 The heat plate method also has the problem that the sealing "ends" of the polyethylene tube tend to be pushed by the heat plate and become thinner due to the pressure applied. It is difficult to increase the sealing strength of the seal. However, the advantage of the heat plate method is that the heat source is stored in the brass seal bar, so sealing is completed only by the vertical movement of the hot plate, which can increase production speed.

 

 Therefore, if seal strength is the only consideration, impulse seals have an advantage, but this results in a higher cost due to the inability to increase production speed.