Abstract: A seal device includes a medium passage that sends a heating medium to a sealing units, the medium passage includes a heating medium passage portion for sending a heating medium to said communication part so as to heat the pressing part, a cooling medium passage portion for sending a cooling medium to the communication part so as to cool the pressing part, and a passage switch unit that switches between a state in which the heating medium passage portion and the communication part are connected, and a state in which the cooling medium passage portion and the communication part are connected.

Abstract: A sealing device is provided which is capable of a two-step holding operation with the use of a linear solenoid. The sealing device includes a stopping mechanism for stopping a movement of a movable part that forms the linear solenoid when the linear solenoid is driven at a predetermined midway point between a start point and an end point after the nozzle part has been moved from the waiting position to the stop position, and for releasing the movable part from a stop to allow the movable part to move again and reach the end point after the nozzle part has been returned from the stop position to the waiting position.

Abstract: A seal device includes a medium passage that sends a heating medium to a sealing units, the medium passage includes a heating medium passage portion for sending a heating medium to said communication part so as to heat the pressing part, a cooling medium passage portion for sending a cooling medium to the communication part so as to cool the pressing part, and a passage switch unit that switches between a state in which the heating medium passage portion and the communication part are connected, and a state in which the cooling medium passage portion and the communication part are connected.

Abstract: The present invention provides sealing device which is capable of a two-step holding operation with the use of a linear solenoid. The sealing device includes a stopping mechanism for stopping a movement of a movable part that forms the linear solenoid when the linear solenoid is driven at a predetermined midway point between a start point and an end point after the nozzle part has been moved from the waiting position to the stop position, and for releasing the movable part from a stop to allow the movable part to move again and reach the end point after the nozzle part has been returned from the stop position to the waiting position.

Abstract: A heat sealer includes a press mechanism, a heater, and an electric power circuit. The heater includes: a thin thermal-electrical insulator plate superposed on a heat dissipating base or on a jaw of the press mechanism; one or more heater wires each of which is a thin metal resistor plate superposed on the thin thermal-electrical insulator plate, each heater wire including an electrode and a heat generating portion; a thermally conductive electrical insulator superposed on the heat generating portion, the thermally conductive electrical insulator being an electrical insulator and having a thermal conductivity that is equal to or higher than that of alumina; a thermal-electrical insulator that covers exposed portions of the heater wires and the electrode; and a thin release film superposed on the thermally conductive electrical insulator. The elements of the heater are made to closely contact each other and fixed by using an adhesive or the like.