JP4755914B2 - paper box - Google Patents

Description

  The present invention relates to a paper box that accommodates a film wound in a roll shape while being supported by a pair of left and right support plates.

  The background art will be described with reference to FIGS.

  A packaging film 1 made of, for example, a synthetic resin for wrapping confectionery or the like is housed and transported in a paper box (usually made of cardboard) in a state of being wound around a core body 2 made of a paper tube.

  A paper box main body (hereinafter referred to as a box main body) A is configured in a rectangular parallelepiped shape having an upper surface opened by a front surface 3, a rear surface 4, left and right side surfaces (toe surfaces) 5, 5 and a bottom surface 6. A pair of support plates 7 and 7 are inserted in an upright state to form a paper box.

  Both support plates 7 and 7 are provided with upper notches 7a and 7a, and both ends of the core body 2 are inserted into the notches 7a and 7a in the box body A so that the film 1 is supported at both ends. It is held in the box body A.

  During transportation, the box body A is put on and a lid B (shown in FIG. 9) is put on it.

  The bottom surface 6 is formed by folding a pair of left and right inner flaps 8, 8 extending from the lower ends of the left and right side surfaces 5, 5 and a pair of front and rear outer flaps 9, 9 extending from the lower ends of the front surface 3 and the back surface 4. Overlaid and configured.

  Here, the projecting length (front-rear direction dimension) of the outer flaps 9, 9 into the box body is approximately ½ of the front-rear direction dimension of the left and right side surfaces 5, 5, and the end faces of each other are abutted. Sealed at the butt.

  On the other hand, in the conventional paper box, the projection length L of the inner flaps 8 and 8 into the box body (dimension in the left-right direction; see FIG. 9) is set to the same dimension as the projection dimension of the outer flaps 9 and 9, for example Thus, the end faces of each other face each other with a slight gap.

In addition, although the general structure of a paper box is shown by patent document 1, for example, especially the structure which supports a roll-shaped film in a box main body by a pair of support plate as mentioned above is not found as a prior patent document.
JP 2002-2111548 A

  In such a paper box, when the film 1 is accommodated, a downward load W due to the film weight is applied to the base end side of the inner flap 8, that is, the inner flap 8 via the support plates 7 and 7, as shown in FIG. It acts on the bending fulcrum portion as a force for pressing it downward, and the inner flap 8 rises and rotates as shown in FIG.

  In this case, in the conventional paper box, since the protruding length L of the inner flap 8 is large as described above, the tip end of the inner flap comes into contact with the lower surface of the film 1 by a slight rising and turning as shown in FIG.

  As a result, the lower surface of the film is squeezed and scratched, or it is easy to break during use based on the damage at this time.

  Therefore, the present invention provides a paper box capable of preventing contact between the inner flap and the film due to the rising and turning of the inner flap.

  The invention according to claim 1 is a box main body that accommodates a film wound in a roll shape around a core body, and a pair of supports that are inserted upright on both the left and right sides of the box main body to support both ends of the core body. The bottom of the box body is a paper box formed by inner flaps projecting into the box body from the lower ends of the left and right side surfaces, and outer flaps stacked on the lower surface of the inner flaps. The protrusion length of the flap into the box body is set in a range that satisfies the following conditions.

  (i) As a lower limit, the dimension should be such that the entire lower surface of the support plate can be supported.

  (ii) The upper end of the inner flap is positioned at the maximum inclination angle that is assumed to cause the inner flap to rise and rotate with the base end side as a fulcrum by a load received via the support plate in a state where the film is accommodated as the upper limit value. The dimensions should not be in contact with the lower surface of the.

  According to a second aspect of the present invention, in the configuration of the first aspect, the upper limit of the protruding length of the left and right inner flaps into the box body is set to the tip of the inner flap when the inner flap rises and pivots with the base end side as a fulcrum. Are set to dimensions that do not intersect the lower surface of the film.

  According to the present invention, the lower limit value of the protrusion length of the left and right inner flaps into the box body is set to a dimension that can support the entire lower surface of the support plate, and the upper flap is set by the load received through the support plate. Since the tip of the inner flap is set to a dimension that does not come into contact with the lower surface of the film at the maximum inclination angle that is assumed to rise and rotate with the base end as a fulcrum, the inner flap tip and the film are secured while ensuring the function of supporting the support plate. It is possible to prevent the film from being damaged and to reliably prevent damage to the film and breakage during use due to damage.

  Moreover, since the above effect can be obtained only by setting the dimensions of the inner flap, for example, compared with the case where protective measures such as placing an insole on the inner flap are taken, the cost is increased and the assembly becomes complicated. No adverse effects occur.

  By the way, since the maximum rising angle of the inner flap due to the above load is determined by the film weight and the position of the contact point between the support plate and the inner flap, the protrusion of the inner flap according to the assumed maximum inclination angle based on verification etc. in theory. If the length is set, contact between the front end of the inner flap and the lower surface of the film can be prevented.

  However, there is a possibility that the inner flap rises beyond the assumed angle by applying a pushing force from below through the outer flap for some unexpected reason, for example during transportation.

  In this regard, according to the invention of claim 2, the upper limit value of the protrusion length of the inner flap is set such that the movement line of the front end of the inner flap intersects with the lower surface of the film when the inner flap rises and rotates with the base end side as a fulcrum. Even if the inner flap rises beyond the maximum inclination angle assumed based on the film load and rotates, the contact with the lower surface of the film at the inner flap tip can be reliably prevented.

  An embodiment of the present invention will be described with reference to FIGS.

  In the embodiment, the same parts as those in the conventional paper box shown in FIGS. 7 to 10 are denoted by the same reference numerals, and redundant description thereof is omitted.

1st Embodiment (refer FIGS. 1-5)
1 shows an unfolded state of the box body C of the paper box according to the first embodiment, FIG. 2 shows an assembling process of the paper box, and FIG. 3 shows an assembled state. The basic structure of the box body C is the same as that of the conventional box body A, and only the bottom structure is different.

  That is, the box body C is formed in a rectangular parallelepiped shape having an upper surface opened by a front surface 3, a back surface 4, left and right side surfaces (toe surfaces) 5, 5 and a bottom surface 10, and a pair of left and right support plates 7, 7 is inserted in an upright state to form a paper box. In FIG. 1, reference numeral 5 a denotes a bonding surface for pasting that extends from the left side surface 5.

  The bottom surface 10 is formed by folding a pair of left and right inner flaps 11, 11 extending from the lower ends of the left and right side surfaces 5, 5 and a pair of front and rear outer flaps 9, 9 extending from the lower ends of the front surface 3 and the back surface 4. Overlaid and configured.

  Here, the length of projection of the outer flaps 9 and 9 into the box body (the dimension in the front-rear direction) is approximately ½ of the dimension in the front-rear direction of the left and right side surfaces 5 and 5 as in the case of the conventional box body A. The end faces of each other are abutted and sealed at the abutting portion.

  On the other hand, the protrusion length M (left-right direction dimension, see FIGS. 1 and 4) of the inner flaps 11 and 11 into the box body is set as a value that satisfies the following conditions.

  (i) The lower limit value is not less than the dimension capable of supporting the entire lower surface of the support plates 7, 7, that is, the thickness dimension of the support plates 7, 7.

  (ii) The upper limit value is assumed that the inner flap 11 rises with the base end side as a fulcrum and rotates with the load W (see FIG. 5) received through the support plates 7 and 7 in the state in which the film 1 is accommodated. The inner flap tip should not be in contact with the lower surface of the film at the maximum inclination angle α.

  In this embodiment, the inner flap protrusion length M is set slightly shorter so that the inner flap 11 does not come into contact with the lower surface of the film even when the inner flap 11 rises slightly larger than the assumed maximum inclination angle α due to vibration during transportation. The case is illustrated.

  Here, the fulcrum for raising and turning the inner flap 11 is theoretically a fulcrum of bending, but the inner flap base end portion including the bending fulcrum is fixed by the support plate 7, so that the support plate 7 actually This is a contact point P (hereinafter referred to as a rotation fulcrum) between the lower end of the inner surface and the inner flap 11.

  In addition, the maximum inclination angle α of the inner flap 11 is determined by the film weight (the magnitude of the load W), the position of the rotation fulcrum P, the material (hardness, elasticity) of the inner flap 11, etc. The protrusion length M of the inner flap 11 is set based on the maximum inclination angle α.

  As a result, the inner flap protrusion length M is much shorter than the inner flap protrusion length L of the conventional box body A.

  According to this configuration, while ensuring the necessary minimum function of supporting the support plates 7 and 7, the inner flaps 11 and 11 are prevented from coming into contact with the film 1 due to the rising and turning of the inner flaps 11 and 11, It is possible to reliably prevent breakage during use due to damage.

  And since it is the structure which prevents a contact with the film 1 only by the dimension setting of the inner flaps 11 and 11, as a contact prevention measure, for example, the structure of covering an insole over the left and right inner flaps 11 and 11 etc. There are no adverse effects such as cost increase and deterioration of assemblability due to an increase in parts as in the case of taking.

Second embodiment (see FIG. 6)
Since the assumed maximum inclination angle α of the inner flaps 11 and 11 is determined by the film weight and the like as described above and can be obtained by verification of an actual product or the like, the inner inclination is usually based on the obtained assumed maximum inclination angle α. If the protrusion length M of the flaps 11 and 11 is set, the contact between the front end of the inner flap and the lower surface of the film can be prevented.

  However, the inner flaps 11 and 11 are lifted over the assumed maximum inclination angle α in FIG. 5 by applying a pushing force from below through the outer flaps 9 and 9 for some unexpected reason, for example during transportation. There is a possibility that the tip of the inner flap contacts the lower surface of the film.

  Therefore, in the second embodiment, the protruding length M of the inner flap 11 is set to a dimension such that the movement lines β1 and β2 of the inner flap tip when the inner flap 11 rises and rotates do not intersect the lower surface of the film 1. Yes.

  In FIG. 6, the alternate long and short dash line indicates the assumed maximum inclination angle state of the inner flap 11 determined by the load, and the alternate long and two short dashes line indicates a state where the inner flap 11 has risen to the vertical as the worst situation. Β1 is a movement line inside the inner flap tip, and β2 is an outer movement line.

  In this way, even if the inner flap 11 exceeds the assumed maximum inclination angle and stands upright as an extreme case, contact with the lower surface of the film at the tip of the inner flap can be reliably prevented.

  However, the probability that such an unexpected situation as described above will occur is extremely low, and the inner flap 11 also has a role of preventing upward rotation of the outer flap 9 and suppressing deformation of the entire box body C, In order to fulfill this role, it is desirable that the protruding dimension M is as large as possible. Therefore, in practice, it is desirable to adopt the first embodiment.

  By the way, in the said embodiment, the thing of the type which covers an upper surface opening part with the cover B of another body as the box main body C was taken as an example, However, this invention is made into the thing of the type which closes an upper surface opening part with an inner and outer flap like the bottom face 10. Can also be applied.

It is an expanded view of the box main body of the paper box concerning 1st Embodiment of this invention. It is a perspective view which shows the assembly process of a paper box. It is a perspective view of the same assembly completion state. It is an expanded sectional view of the state where a film was stored. It is the figure which expanded a part of FIG. 4 further. FIG. 6 is a view corresponding to FIG. 5 of a paper box according to a second embodiment of the present invention. It is a perspective view which shows the assembly process of the conventional paper box. It is a perspective view which shows the same assembly completion state. It is an expanded sectional view of the state where a film was stored. It is the figure which expanded a part of FIG. 9 further.

Explanation of symbols

C Box body 1 Film 2 Core body 3 Front face 4 Back face 5, 5 Left and right side faces 7, 7 Support plate 9 Outer flap 10 Bottom face 11 Inner flap M Projection dimension of inner flap P Lifting pivot point W Load α Assumed maximum inclination angle β1 , β2 Inner flap tip movement line

Claims (2)

The box comprising: a box main body that accommodates a film wound in a roll shape around the core; and a pair of support plates that are inserted in a standing state on both the left and right sides of the box main body and support both ends of the core. The bottom surface of the main body is a paper box formed by an inner flap projecting into the box body from the lower ends of the left and right side surfaces and an outer flap superimposed on the lower surface of the inner flap, and the left and right inner flaps into the box body. A paper box characterized in that the protruding length is set in a range satisfying the following conditions.
(i) As a lower limit, the dimension should be such that the entire lower surface of the support plate can be supported.
(ii) The upper end of the inner flap is positioned at the maximum inclination angle that is assumed to cause the inner flap to rise and rotate with the base end side as a fulcrum by a load received via the support plate in a state where the film is accommodated as the upper limit value. The dimensions should not be in contact with the lower surface of the.   Set the upper limit of the protrusion length of the left and right inner flaps into the box body so that the movement line of the inner flap tip does not intersect the lower surface of the film when the inner flap rises around the base end and rotates. The paper box according to claim 1, wherein

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