Process for production of polytetrafluoroethylene sheet, and process for production of polytetrafluoroethylene seal tape

A method of manufacturing a polytetrafluoroethylene seal tape, the method comprising:

• (i)providing a dispersion containing water as a dispersion medium, polytetrafluoroethylene particles, and a surfactant, applying a force to the dispersion, the force making the particles approach or contact with each other, thereby binding the particles to form a deformable polytetrafluoroethylene-containing solid material including the water, the surfactant and the bound particles, and discharging the formed solid material from an outlet of a chamber, wherein the force is applied in the chamber by spraying the dispersion to an inner wall of the chamber or a component placed in the chamber;
• (ii) deforming the solid material into a sheet form;
• and
• (iii) reducing a content of the water in the solid material deformed into a sheet form.

A method of manufacturing a polytetrafluoroethylene sheet, the method comprising:

• (i) providing a dispersion containing water as a dispersion medium, polytetrafluoroethylene particles, and a surfactant, applying a force to the dispersion, the force making the particles approach or contact with each other, thereby binding the particles to form a deformable polytetrafluoroethylene-containing solid material including the water, the surfactant and the bound particles, and discharging the formed solid material from an outlet of a chamber, wherein the force is applied in the chamber by supplying the dispersion to the chamber through a plurality of feeders, and by colliding the dispersions provided from the plurality of feeders with each other in the chamber;
• (ii) deforming the solid material into a sheet form;
• and
• (iii) reducing a content of the water in the solid material deformed into the sheet form.

A method of manufacturing a polytetrafluoroethylene seal tape, the method comprising:

• (i) providing a dispersion containing water as a dispersion medium, polytetrafluoroethylene particles, and a surfactant, applying a force to the dispersion, the force making the particles approach or contact with each other, thereby binding the particles to form a deformable polytetrafluoroethylene-containing solid material including the water, the surfactant and the bound particles, and discharging the formed solid material from an outlet of a chamber, wherein the force is applied in the chamber by supplying the dispersion to the chamber through a plurality of feeders, and by colliding the dispersions provided from the plurality of feeders with each other in the chamber;
• (ii) deforming the solid material into a sheet form;
• and
• (iii) reducing a content of the water in the solid material deformed into the sheet form.

A method of manufacturing a polytetrafluoroethylene sheet, the method comprising:

• (i) providing a dispersion containing water as a dispersion medium, polytetrafluoroethylene particles, and a surfactant, applying a force to the dispersion, the force making the particles approach or contact with each other, thereby binding the particles to form a deformable polytetrafluoroethylene-containing solid material including the water, the surfactant and the bound particles, and discharging the formed solid material from an outlet of a pipe having a barrier disposed therein, wherein the force is applied by supplying the dispersion to the pipe, thereby making the dispersion contact the barrier, thus inhibiting a flow of the dispersion;
• (ii) deforming the solid material into a sheet form;
• and
• (iii) reducing a content of the water in the solid material deformed into the sheet form.

A method of manufacturing a polytetrafluoroethylene seal tape, the method comprising:

• (i) providing a dispersion containing water as a dispersion medium, polytetrafluoroethylene particles, and a surfactant, applying a force to the dispersion, the force making the particles approach or contact with each other, thereby binding the particles to form a deformable polytetrafluoroethylene-containing solid material including the water, the surfactant and the bound particles, and discharging the formed solid material from an outlet of a pipe having a barrier disposed therein, wherein the force is applied by supplying the dispersion to the pipe, thereby making the dispersion contact the barrier, thus inhibiting a flow of the dispersion;
• (ii) deforming the solid material into a sheet form;
• and
• (iii) reducing a content of the water in the solid material deformed into the sheet form.