Packing apparatus, packing bag forming method, and packing method

A method of forming a packing bag comprising:

• traveling a packing plastic bubble material sheet pulled out from an original roll along a triangular plane of a triangular plate while applying a tension to the material sheet along oblique sides connecting a base and a vertex of the triangular plate;
• sliding the material sheet from the base to the vertex while applying a reaction for curbing a drawn quantity of a middle portion of the material sheet in a width direction to both sides of the material sheet in a width direction that is contained in an overlapped portion having an end;
• forming a bending portion on a side of the vertex and a triangular open aperture on a side of the base by folding the material sheet using the vertex;
• drawing out the width-direction middle portion and the overlapped width-direction sides while holding the bending portion through a pair of drawing rolls;
• fusing and cutting off the end of the overlapped portion in a width direction, using a welding and cutting device;
• automatically pulling out a predetermined amount of the material sheet using the drawing rolls to form an incomplete packing bag having the bending portion as a bottom and the open space as an insertion aperture for a packed member;
• inserting into the incomplete packing bag the packed member through the insertion aperture thereof;
• fusing and cutting, in a width direction, the incomplete packing bag into which the packed member is inserted, using the welding and cutting device to form a packing bag with the packed member inserted therein;
• and
• consecutively iterating a series of steps from the step of forming an incomplete packing bag to the step of forming a packing bag.

A packing apparatus comprising:

• a holding roll for holding an original roll having a packing plastic bubble material sheet that contains a middle portion in a width direction;
• a triangular plate having a triangular plane, a base, a vertex, and oblique sides connecting the base and the vertex, the material sheet pulled out from the original roll, and folded in two at the width-direction middle portion by the vertex while being traveled along the triangular plane from the base to the vertex with a tension applied to the material sheet along the oblique sides, to form a bending portion on a side of the vertex, an overlapped portion containing sides in a width direction, and a triangular open space on a side of the base, the triangular plate being inclined downward from the base to the vertex with respect to a horizontal plane;
• a pair of drawing rolls for drawing out the width-direction middle portion of the material sheet and the overlapped width-direction sides while holding the bending portion;
• and
• a fusing and cutting device positioned away from the drawing rolls for fusing and cutting the overlapped portion in a width direction to consecutively form a packing bag having the bending portion as a bottom and the open space as an insertion aperture for a packed member,
• wherein the drawing rolls are positioned with respect to the triangular plate so that the tension is produced in a direction to curb the bending portion that is supposed to be drawn out;
• and
• wherein the pair of drawing rolls extend from the base to the vertex of the triangular plate and are inclined with respect to the horizontal plane.

A packing apparatus comprising:

• a holding roll for holding a original roll having a packing plastic bubble material sheet that contains a middle portion in a width direction;
• a triangular plate having a triangular plane, a base, a vertex, and oblique sides connecting the base and the vertex, the material sheet pulled out from the original roll, and folded in two at the width-direction middle portion by the vertex while being traveled along the triangular plane from the base to the vertex with a tension applied along the oblique sides, to form a bending portion on a side of the vertex, an overlapped portion containing sides in a width direction, and a triangular open space on a side of the base;
• a pair of drawing rolls for drawing out the width-direction middle portion of the material sheet and the overlapped width-direction sides while holding the bending portion;
• and
• a fusing and cutting device positioned away from the drawing rolls for fusing and cutting the overlapped portion in a width direction to consecutively form a packing bag having the bending portion as a bottom and the open space as an insertion aperture for a packed member,
• wherein the triangular plate is positioned having a downward inclination angle with respect to a horizontal plane from the base toward the vertex,
• wherein the drawing rolls are positioned having an inclination angle with respect to the horizontal plane so that the tension is produced in a direction to curb the bending portion that is supposed to be drawn out, and
• wherein the pair of drawing rolls extend from the base to the vertex of the triangular plate and are inclined with respect to the horizontal plane.