Pulp molded cushioning material and packing case provided with same
A pulp molded cushioning material includes a hollow fitting portion, into which an end portion of an article is fitted. The pulp molded cushioning material includes a main body, a cushioning portion, and a protrusion. The cushioning portion is integrally formed with the main body and protrudes in a first direction from a peripheral edge of the main body to form the fitting portion together with the main body. The protrusion is integrally formed with the main body and takes a first posture. The protrusion is changeable in posture from the first posture to a second posture. The first posture is a posture in which the protrusion protrudes in the first direction from the main body. The second posture is a posture in which the protrusion protrudes in a second direction across the first direction.
1. A pulp molded cushioning material with a hollow fitting portion, into which an end portion of an article is fitted, comprising:
a main body; and
a plurality of cushioning portions integrally formed with the main body and protruding in a first direction from a peripheral edge of the main body to form the hollow fitting portion together with the main body,
wherein the main body includes a protrusion protruding from the main body,
the cushioning portions have recesses notched from tip ends thereof to the main body,
the protrusion is changeable in posture between a first posture in which the protrusion protrudes from the main body in the first direction in an inside of the hollow fitting portion and a second posture in which the protrusion extends in a second direction across the first direction and protrudes from the inside of the hollow fitting portion to one recess of the recesses,
the protrusion in the first posture is not fitted into the one recess,
the protrusion in the second posture is fitted into the one recess,
the main body further includes a protrusion forming portion, on which the protrusion is formed,
the protrusion forming portion is foldable by being cut at a part of a perimeter thereof,
the protrusion forming portion, in the second posture of the protrusion, is folded along another part of the perimeter thereof that is not cut,
the protrusion in the second posture protrudes in the second direction from the folded protrusion forming portion to be fitted in the one recess,
the protrusion in the second posture reinforces part of one of the cushioning portions that has the one recess to which the protrusion is fitted,
a cutting line is formed on the part of the perimeter of the protrusion forming portion, and
the protrusion forming portion, in the second posture of the protrusion, is folded along another part of the perimeter thereof along which no cutting line is formed.
2. A pulp molded cushioning material according to claim 1 , wherein
the protrusion has a side surface and reduces in thickness as it goes from its base end to its distal end, and
a wall surface, which forms the one recess, inclines correspondingly to the side surface of the protrusion in the second posture.
3. A pulp molded cushioning material according to claim 1 , wherein
each of the recesses is formed in an inwardly expanding trapezoidal shape when viewed in plan.
4. A pulp molded cushioning material according to claim 1 , wherein
the protrusion has a side surface and reduces in thickness as it goes from its base end to its distal end, and
a wall surface, which forms the one recess, inclines relative to the second direction correspondingly to the side surface of the protrusion in the second posture, the one recess being tapered outward of the hollow fitting portion.
5. A pulp molded cushioning material according to claim 1 , wherein
the protrusion is a dummy rib.
6. A packing case, comprising:
an outer casing; and
a pulp molded cushioning material with a hollow fitting portion, into which an end portion of an article is fitted,
wherein the pulp molded cushioning material includes:
a main body; and
a plurality of cushioning portions integrally formed with the main body and protruding in a first direction from a peripheral edge of the main body to form the hollow fitting portion together with the main body,
wherein the main body includes a protrusion protruding from the main body,
the cushioning portions have recesses notched from tip ends thereof to the main body,
the protrusion is changeable in posture between a first posture in which the protrusion protrudes from the main body in the first direction in an inside of the hollow fitting portion and a second posture in which the protrusion extends in a second direction across the first direction and protrudes from the inside of the hollow fitting portion to one recess of the recesses,
the protrusion in the first posture is not fitted into the one recess,
the protrusion in the second posture is fitted into the one recess,
the main body further includes a protrusion forming portion, on which the protrusion is formed,
the protrusion forming portion is foldable by being cut at a part of a perimeter thereof,
the protrusion forming portion, in the second posture of the protrusion, is folded along another part of the perimeter thereof that is not cut,
the protrusion in the second posture protrudes in the second direction from the folded protrusion forming portion to be fitted in the one recess,
the protrusion in the second posture reinforces part of one of the cushioning portions that has the one recess to which the protrusion is fitted
a cutting line is formed on the part of the perimeter of the protrusion forming portion, and
the protrusion forming portion, in the second posture of the protrusion, is folded along another part of the perimeter thereof along which no cutting line is formed.