Heat-sealing apparatus and method for forming composite heat seal structure

1. A heat-sealing apparatus comprising:

a belt conveying, heating and press bonding portion configured to convey and heat a heat seal material to form a band-shaped peelable seal, wherein the belt conveying, heating and press bonding portion comprises:

a pair of belts, each of the pair of belts engaged to rollers and configured to travel between the rollers, and

a heating body spaced from the pair of belts; and

a die roll press bonding portion configured to add a linear peelable seal to the band-shaped peelable seal in a longitudinal direction of the band-shaped peelable seal for forming a composite heat seal structure, the die roll press bonding portion including

a linear roller having a linear rib on a peripheral surface of the linear roller in a circumferential direction of the linear roller, and

an elastic roller.

2. The heat-sealing apparatus as set forth in claim 1 , wherein at least one of the rollers is configured to move in a direction perpendicular to a traveling direction of the pair of belts to control a space between the rollers and change press bonding pressure applied to the heat seal material.

3. The heat-sealing apparatus as set forth in claim 1 , wherein the linear rib has a width ranging from 0.05 millimeters (mm) to 0.2 mm and a height ranging from 0.05 mm to 2 mm.

4. The heat-sealing apparatus as set forth in claim 1 , wherein a width of a surface of the linear roller in contact with the elastic roll is identical to a width of the band-shaped peelable seal.

5. The heat-sealing apparatus as set forth in claim 1 , wherein a peripheral surface of the elastic roller is covered with an elastic material sheet having a hardness of A 50 to A 80.

6. The heat-sealing apparatus as set forth in claim 1 , wherein at least one of the linear roller or the elastic roller is configured to move in a direction perpendicular to the longitudinal direction to adjust press bonding pressure.

7. The heat-sealing apparatus as set forth in claim 1 , further comprising:

a temperature keeping portion between the belt conveying, heating and press bonding portion and the die roll press bonding portion.

8. The heat-sealing apparatus as set forth in claim 7 , wherein the temperature keeping portion comprises a temperature keeping plate connected to a heat source.

9. The heat-sealing apparatus as set forth in claim 1 , wherein said each of the pair of belts comprises a metal belt.

10. The heat-sealing apparatus as set forth in claim 9 , wherein the metal belt comprises at least one of stainless steel, aluminum or brass and has a thickness ranging from 0.01 mm to 0.2 mm.

11. The heat-sealing apparatus as set forth in claim 1 , wherein the heating body is surrounded by a belt of the pair of belts.