Ultrasonic fuse-bonding sealing apparatus with improved contact surfaces

An ultrasonic sealing apparatus, for fuse-bonding together a pair of sheet-like members by frictional heat generated by ultrasonic vibration, comprising:

• (a) horn means, having a contact surface in contact with one of said sheet-like members;
• and
• (b) anvil means, having a contact surface in contact with the other sheet-like member;
• said anvil means being in confrontation with said horn means, said contact surfaces of said horn and anvil means being formed with grooves to provide a plurality of protrusions, said grooves providing a bending pattern, each of said protrusions having a flat upper surface and slanted side surfaces so that each of said protrusions has a trapezoidal shape in cross-section, said protrusions being arranged such that said grooves extend from one end to the other end of each of said contact surfaces in zig-zag fashion, said flat upper surfaces of said protrusions having an octagonal shape, said pair of sheets having fuse-bonding surfaces and at least one of said horn and anvil means providing ultrasonic vibration in a direction oblique to said fuse-bonding surfaces.

An ultrasonic sealing apparatus, for fuse-bonding together a pair of sheet-like members by frictional heat generated by ultrasonic vibration, comprising:

• (a) horn means, having a contact surface in contact with one of said sheet-like members;
• and
• (b) anvil means, having a contact surface in contact with the other sheet-like member;
• said anvil means being in confrontation with said horn means, said contact surfaces of said horn and anvil means being formed with grooves to provide a plurality of protrusions, said grooves providing a bending pattern, each of said protrusions having a flat upper surface and slanted side surfaces so that each of said protrusions has a trapezoidal shape in cross-section, said protrusions being arranged such that said grooves extend from one end to the other end of each of said contact surfaces in zig-zag fashion, said flat upper surfaces of said protrusions having a circular shape, said pair of sheets having fuse-bonding surfaces and at least one of said horn and anvil means providing ultrasonic vibration in a direction oblique to said fuse-bonding surfaces.

An ultrasonic sealing apparatus, for fuse-bonding a bottom portion of a thermoplastic tubular container by frictional heat generated by ultrasonic vibration, comprising:

• (a) horn means, having a contact surface in contact with said bottom portion;
• (b) anvil means, having a contact surface in contact with said bottom portion,
• said bottom portion being held between said horn and anvil means, and a position of said anvil means being displaceable relative to said horn means, said contact surfaces of said horn and anvil means being formed with grooves to provide a plurality of protrusions, said grooves providing a bending pattern, each of said protrusions having a flat upper surface and slanted side surfaces so that each of said protrusions has a trapezoidal shape in cross-section, said protrusions being arranged such that said grooves extend from one end to the other end of each of said contact surfaces in zig-zag fashion, said flat upper surfaces of said protrusions being of honeycomb configuration, said bottom portion having fuse-bonding surfaces and at least one of said horn and anvil means providing ultrasonic vibration in a direction oblique to said fuse-bonding surfaces;
• (c) conveyor means adapted to position said bottom portion between said horn and anvil means when they are opened;
• and
• (d) guide means adapted to flatten said bottom portion and to introduce said bottom portion into a space defined between said contact surfaces of said horn and anvil means.

An ultrasonic sealing apparatus, for fuse-bonding a bottom portion of a thermoplastic tubular container by frictional heat generated by ultrasonic vibration, comprising:

• (a) horn means, having a contact surface in contact with said bottom portion;
• (b) anvil means, having a contact surface in contact with said bottom portion,
• said bottom portion being held between said horn and anvil means, and a position of said anvil means being displaceable relative to said horn means, said contact surfaces of said horn and anvil means being formed with grooves to provide a plurality of protrusions, said grooves providing a bending pattern, each of said protrusions having a flat upper surface and slanted side surfaces so that each of said protrusions has a trapezoidal shape in cross-section, said protrusions being arranged such that said grooves extend from one end to the other end of each of said contact surfaces in zig-zag fashion, said flat upper surfaces of said protrusions having an octagonal shape, said bottom portion having fuse-bonding surfaces and at least one of said horn and anvil means providing ultrasonic vibration in a direction oblique to said fuse-bonding surfaces;
• (c) conveyor means adapted to position said bottom portion between said horn and anvil means when they are opened;
• and
• (d) guide means adapted to flatten said bottom portion and to introduce said bottom portion into a space defined between said contact surfaces of said horn and anvil means.

An ultrasonic sealing apparatus, for fuse-bonding a bottom portion of a thermoplastic tubular container by frictional heat generated by ultrasonic vibration, comprising:

• (a) horn means, having a contact surface in contact with said bottom portion;
• (b) anvil means, having a contact surface in contact with said bottom portion,
• said bottom portion being held between said horn and anvil means, and a position of said anvil means being displaceable relative to said horn means, said contact surfaces of said horn and anvil means being formed with grooves to provide a plurality of protrusions, said grooves providing a bending pattern, each of said protrusions having a flat upper surface and slanted PG,38 side surfaces so that each of said protrusions has a trapezoidal shape in cross-section, said protrusions being arranged such that said grooves extend from one end to the other end of each of said contact surfaces in zig-zag fashion, said flat upper surfaces of said protrusions having a circular shape, said bottom portion having fuse-bonding surfaces and at least one of said horn and anvil means providing ultrasonic vibration in a direction oblique to said fuse-bonding surfaces;
• (c) conveyor means adapted to position said bottom portion between said horn and anvil means when they are opened;
• and
• (d) guide means adapted to flatten said bottom portion and to introduce said bottom portion into a space defined between said contact surfaces of said horn and anvil means.