JP2012001237A - Preventing corrugated cardboard from wounding hand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain sufficient hand wounding preventive effect by a low-cost punching die which does not require an excess accuracy while securing the strength of a corrugated fiberboard.SOLUTION: A plurality of trunk-crushable creases 10 in the direction orthogonal to a reference line of an edge are formed in an edge section of a corrugated fiberboard such as an outer flap 5, and branch-crushable creases 11 across the trunk-crushable creases 10 are formed intermittently for each trunk-crushable crease 10 in a T shape together with the trunk-crushable creases 10 except rear end side sections of the trunk-crushable creases 10. A crush section 9 is formed thereby. When a hand is applied to an edge of the corrugated fiberboard, the corrugated fiberboard is bent from the branch-crushable creases 11 to the trunk-crushable creases 10 in a guiding manner, and the corrugated fiberboard is softly abutted on the hand to obtain the excellent hand wounding preventive effect. Further, any branch-crushable creases 11 are not provided across rear end sections of the trunk-crushable creases 10, and a degradation in the strength of the corrugated fiberboard can be prevented thereby.

Description

  The present invention relates to a structure for preventing hand-cutting at an edge of a corrugated cardboard, and a die for punching a carton and a blank to which the structure is applied.

  For example, when packaging beverage cans such as beer, as shown in FIG. 9, a pair of side plates 1 and 2 are connected in a cylindrical shape through passage pieces 3 so that each pair faces each other. A plurality of packs containing cans C are wrapped by the cylindrical side plates 1 and 2, and the inner flap 4 extending from each side plate 2 and the outer flap 5 extending from each side plate 1 are sequentially folded inward, A wrap round type corrugated cardboard carton is used which is bonded at the bonding part a with a melt adhesive and seals the end face.

  In such a carton, a tear strip 6 such as a cut tape is provided from the side plate 2 to the inner flap 4 so that it can be opened in a tray shape in a horizontally placed state. Is formed in the center portion of the side plate 2 by cutting.

  By the way, when opening the carton as described above, the can C is taken out as much as necessary, and the remaining portion is stored without being bulky. In many cases, the outer flap 5 and the inner flap 4 are opened from the end surface where the outer flap 5 overlaps. At that time, when the outer outer flap 5 is to be peeled off from the inner inner flap 4, a hand is put on the edge of the outer flap 5, The hand may hit the sharp cutting edge of the cardboard and cut the hand.

  For this reason, in Patent Document 1 below, as shown in FIG. 10, a reference line L is set in parallel to the edge of the outer flap 5, and a plurality of ruled lines 51 perpendicular to the reference line L are provided. A corrugated cardboard carton has been proposed in which a plurality of intersecting ruled lines 52 intersecting each other are put in a lattice shape and the crushing portion 50 is formed to a position away from the edge of the cardboard.

  In the invention described in Patent Document 1, since the intermediate paper constituting the corrugated cardboard is formed in a corrugated shape, the squeezed portion 50 is used for the end edge portion of the outer flap 5 having thickness and rigidity. It is intended to soften the paper steps by crushing and to soften the touch at the time of opening. In addition, the oblique line 8 put in one side plate 1 is for bending at the time of opening and enlarging an opening part.

JP 2008-44664 A

  However, if the grid-like crushing portion as described above is provided, the compression portion of the cardboard extends over a wide range, so that the strength at the time of sealing may be slightly reduced, and the ruled line separated from the edge of the cardboard If is omitted, there is a problem that the effect of preventing hand-cutting cannot be sufficiently obtained.

  In addition, in the punching die that forms such a grid-like crushing portion, the number of parts such as pressing pieces to be implanted in the substrate increases in order to insert ruled lines, and many steps are required for forming the implantation groove in the substrate. Therefore, the manufacturing cost is high, and furthermore, it is necessary to fit all of the lattice-shaped pressing pieces into the grooves of the facing face plate. Therefore, it is strictly applicable to die cutting and face plate processing and mounting to these punching machines. There is a problem that high accuracy is required.

  Accordingly, an object of the present invention is to obtain a sufficient effect of preventing hand breakage while ensuring the strength of the cardboard, and to enable processing with a die cutting that is inexpensive and does not require excessive accuracy.

  In order to solve the above-described problems, the present invention provides a cardboard hand break prevention structure in which a crushing portion is formed along an edge of the cardboard, wherein the crushing portion is a reference line set in parallel to the edge of the cardboard. A plurality of trunk ruled lines in a direction orthogonal to the edge of the corrugated cardboard are inserted, and branch ruled lines intersecting the trunk ruled lines are intermittently provided for each trunk ruled line. By inserting except for the rear end portion of the ruled line, the trunk ruled line and the branch ruled line are formed in a T shape.

  Further, the edge of the corrugated cardboard was cut into a wave shape, and a trunk ruled line was inserted corresponding to the bulging portion of the waved edge.

  Further, an edge ruled line is continuously provided along the edge between the edge of the cardboard and the tip of the trunk ruled line.

  And in the corrugated cardboard carton where the inner flap is connected to the pair of side plates, the outer flap is connected to the other pair of side plates, and the end surface is sealed by bonding the inner flap and the outer flap, at least at the edge of the outer flap, This structure for preventing cardboard hand breakage was adopted.

  Also, in order to produce the corrugated cardboard carton, in the punching die, a plurality of stem pressing pieces for inserting the stem ruled lines are arranged in a direction perpendicular to the cutting edge for punching the edge of the cardboard, and the branch pressing for inserting the branch ruled lines A piece is provided so as to intersect with each of the stem pressing pieces so that the trunk pressing piece and the branch pressing piece have a T-shape.

  In this way, when the crushing portion is formed by inserting the trunk ruled line and the branch ruled line at the edge part of the cardboard, when the hand is put on the edge of the cardboard, the cardboard is moved from the branch ruled line to the trunk ruled line. Because it bends as if guided, the touch of the hand is soft, and an excellent hand cut prevention effect is obtained, and there is no branch ruled line at the rear end side portion of the trunk ruled line, thus preventing a reduction in the strength of the cardboard Is done.

  In addition, since the die for forming the crushing portion is provided with a branch pressing piece for each of a plurality of stem pressing pieces for inserting a trunk ruled line, the number of pressing pieces and the like is reduced, and the step of implanting into the substrate is performed. Can be manufactured at low cost, and there is no need for excessive accuracy in manufacturing and mounting to a punching machine.

The perspective view which shows the sealing state of the cardboard carton which concerns on 1st Embodiment Enlarged view of the outer flap part The partial expansion perspective view which shows the extraction of the edge part of an outer flap same as the above Schematic cross-sectional view of the punching process showing the same punching die as seen from the IV-IV direction in Fig. 3 and mounted on the punching machine Schematic cross-sectional view showing the punched state by the same die Sectional drawing which shows the curved state at the time of opening of an outer flap same as the above The enlarged view of the outer flap part of 2nd Embodiment The enlarged view of the outer flap part of 3rd Embodiment The perspective view which shows the opening state of the conventional common cardboard carton The perspective view which shows the sealing state of the corrugated cardboard carton concerning patent document 1

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  The corrugated cardboard carton shown in FIG. 1 is a can in which a pair of side plates 1 and 2 are connected in a cylindrical shape through passage pieces 3 so that each pair faces each other in the same manner as shown in FIG. A plurality of packs containing C are wrapped by the cylindrical side plates 1 and 2, and the inner flap 4 extending from each side plate 2 and the outer flap 5 extending from each side plate 1 are sequentially folded inward, and hot melt adhesive is used. It is a wrap round type in which the end face is sealed by bonding at the bonding part a.

  In this carton, from the side plate 2 to the inner flap 4, a tear strip 6 such as a cut tape used for unsealing is provided at the center in the width direction, and a cut-out portion of the tear strip 6 is provided. 7 is formed in the center part of the side plate 2 by cutting. Further, the side plate 1 that overlaps the outside of the passage piece 3 is provided with a diagonal fold line 8 that is bent when the outer flap 5 and the inner flap 4 are overlapped from the end face to expand the opening.

  Then, as shown in FIG. 2, at the middle portion of the edge of the outer flap 5 and at both shoulder portions formed lower than this, the edge of the corrugated cardboard is cut into a wave shape, and the edge of the outer flap 5 at this portion The part is provided with a crushing part 9 for preventing hand breakage. The crushing portion 9 sets a virtual reference line L that connects the vertices of the corrugated edge of the cardboard, and a plurality of straight trunk ruled lines 10 arranged at equal intervals in a direction orthogonal to the reference line L; It is formed by inserting a branch ruled line 11 intersecting the trunk ruled line 10 close to the edge thereof.

  In the crushing portion 9, the trunk ruled line 10 is inserted corresponding to the apex position of the bulging portion of the corrugated end edge of the cardboard. Further, the branch ruled line 11 is intermittently provided for each trunk ruled line 10 and symmetrically on both sides around the trunk ruled line 10 with the tip of the trunk ruled line 10 near the edge of the cardboard as a vertex. It is slanted so as to spread away from the edge, and is placed in a T-shape with the trunk ruled line 10, and is inserted into the rear end side portion of the trunk ruled line 10 away from the edge of the cardboard. Not.

  Such an outer flap 5 has a thickness and rigidity due to the corrugated cardboard structure in which the inner paper is formed in a corrugated shape. By crushing the step of the middle paper with the ruled line 10 and the branch ruled line 11, the edge of the outer flap 5 is softened.

  Here, the wavelength of the edge of the corrugated cardboard may be set to an arbitrary size from slightly larger to slightly smaller than the thickness of the finger in order to effectively prevent finger slipping. Further, the edge of the cardboard may be subjected to anti-slip processing of fine irregularities. In this case, the corrugated processing described above is omitted, the edge of the cardboard is made straight, and the edge is set to the reference line L. May be set as

  The corrugated cardboard carton as described above is formed by assembling a sheet-like blank, and this blank is manufactured by punching a corrugated cardboard sheet with a die 21 as shown in FIG.

  In the punching die 21, straight stem pressing pieces 23 for inserting the stem ruled lines 10 are equally spaced in a direction perpendicular to the cutting blade 22 that is implanted in a plywood board serving as a substrate and punches out the contour as the edge of the outer flap 5. The branch pressing pieces 24 for placing the branch ruled lines 11 are provided at the same height so as to intersect with each of the trunk pressing pieces 23.

  That is, the shapes and arrangements of the cutting blade 22, the trunk pressing piece 23, and the branch pressing piece 24 correspond to the shapes and arrangement of the edge of the outer flap 5, the trunk ruled line 10, and the branch ruled line 11.

  As shown in FIG. 4, the punching machine to which such a die 21 is attached has an upper board 31 and a lower board 32 that are in contact with and away from each other, and the die 21 is attached to the upper board 31, and the lower board 32 is made of stainless steel. A made face plate 33 is attached. On the upper surface of the face plate 33, grooves 34 and 35 into which the trunk pressing piece 23 and the branch pressing piece 24 are respectively inserted are formed. The positions and shapes of the grooves 34 and 35 correspond to the positions and shapes of the trunk pressing piece 23 and the branch pressing piece 24, respectively.

  Instead of directly forming the grooves 34 and 35 in the face plate 33 in this way, a receiving member in which a groove into which the trunk pressing piece 23 and the branch pressing piece 24 are inserted is formed in a bakelite or brass plate material. It may be pasted so as to protrude.

  In this punching machine, the corrugated cardboard sheet S is fed between the die 21 and the face plate 33, and the upper board 31 and the lower board 32 are brought close to each other as shown in FIG.

  Along with this, the corrugated cardboard sheet S is punched out with the cutting blade 22 so that the cutting edge comes into contact with the face plate 33 to form an outline which becomes the edge of the outer flap 5, and the trunk pressing piece 23 and the branch pressing piece 24 form grooves. The trunk ruled lines 10 and the branch ruled lines 11 are inserted into the end edges of the outer flap 5. Thereby, the blank which has the crushing part 9 in the edge part of the outer flap 5 is formed.

  When such a crushing portion 9 is formed, as shown in FIG. 6, when the carton is opened, when the hand is put on the edge of the outer flap 5, the outer flap extends from the branch ruled line 11 to the trunk ruled line 10. 5 so as to be guided, the touch of the hand becomes soft, an excellent effect of preventing hand breakage is obtained, and there is no branch ruled line 11 at the rear end side portion of the trunk ruled line 10, so that the carton A reduction in strength during sealing is prevented.

  Moreover, as shown in FIG. 1, when the above crushing part 9 is formed not only on the edge part of the outer flap 5 but also on the edge part of the side plate 1 that overlaps the passage piece 3, When the crushing portion 9 as described above is formed on the edge portion of the inner flap 4, the edge of the inner flap 4 can be removed when the can C is taken out in a vertically placed state. It is possible to prevent hand cuts.

  By the way, in addition to the above-described embodiment, as in the second embodiment shown in FIG. 7, the crushing portion 9 is formed at the end edge portion of the outer flap 5 or the like, and therefore a straight line is formed in a direction perpendicular to the end edge Two branch ruled lines 11 may be provided on both sides between the front end and the rear end of the trunk ruled line 10 extending in a shape. In this case, the branch ruled line 11 is formed so as to be symmetrically widened toward both sides around the trunk ruled line 10 so as to spread toward the edge thereof, and to form a deformed T-shape with the trunk ruled line 10. ing.

  Further, as in the third embodiment shown in FIG. 8, after the trunk ruled line 10 and the branch ruled line 11 are put in the same manner as in the second embodiment, the edge of the cardboard such as the outer flap 5 and the trunk push The edge stamped ruled line 12 may be continuously provided along the edge between the front end of the ruled line 10. When the edge ruled line 12 is inserted in this manner, the vicinity of the edge of the cardboard is crushed and the touch of the hand is further softened.

  Even in the case where the trunk ruled line 10 and the branch ruled line 11 are inserted as in the first embodiment, in addition to the trunk ruled line 10 and the branch ruled line 11, continuous along the edge of the cardboard. If the edge ruled line 12 is inserted in the frame, the effect of preventing hand breakage is improved.

  Here, in order to form the corrugated cardboard blanks according to the second and third embodiments, as in the case of the die 21 according to the first embodiment, the edge of each corrugated cardboard, the trunk ruled line 10 and the branches. What is necessary is just to manufacture the die | dye which planted the cutting blade corresponding to the ruled line 11, the stem pressing piece, and the branch pressing piece in the board | substrate.

  In the die cutting according to each embodiment as described above, the branch pressing piece 24 is provided for each of the plurality of stem pressing pieces 23 into which the trunk ruled line 10 is inserted, so that the pressing piece is compared with the die cutting described in Patent Document 1. In addition, the number of points such as sponges in the vicinity thereof is reduced, the process of implantation into the substrate can be saved, and it can be manufactured at low cost, and there is no need for excessive accuracy in manufacturing and mounting on a punching machine.

  Further, it is more effective to provide the stem pressing ruled line 10 of the hand cutting prevention structure according to each of the above embodiments at a position close to the edge of the cardboard in order to improve the hand cutting prevention effect. If the length of the ruled line 10 is too long, the strength of the cardboard is lowered.

  Further, when the edge of the cardboard is inclined with respect to the reference line L, the trunk ruled line 10 is obliquely directed to the edge of the cardboard and extends in a direction orthogonal to the reference line L. Good.

  In addition, the branch ruled line 11 may be a straight line as in the above embodiment as long as it forms a T shape with the trunk ruled line 10 by crossing the straight trunk ruled line 10 and extending to both sides thereof. In addition, a curved shape such as an arc shape may be used. However, it is preferable that the shape is symmetrical to both sides with the trunk ruled line 10 as the center.

  Further, as in the above-described embodiments, the branch ruled line 11 is more effectively provided in the vicinity of the tip of the trunk ruled line 10 near the edge of the corrugated cardboard, so that the hand cut prevention effect is effectively obtained. If provided, the strength of the cardboard may only be reduced.

  The cardboard hand break prevention structure as described above can be applied to structures other than the wrap round type, such as a corrugated cardboard carton and a corrugated cardboard toy, and can improve safety during handling.

DESCRIPTION OF SYMBOLS 1, 2 Side plate 3 Passage piece 4 Inner flap 5 Outer flap 6 Tear strip 7 Cut part 8 Diagonal fold line 9 Crushing part 10 Stem crease line 11 Branch crease line 12 Edge crease line 21 Cutting die 22 Cutting blade 23 Trunk push piece 24 Branch pressing piece 31 Upper board 32 Lower board 33 Face plates 34, 35 Groove L Reference line

Claims (5)

  In the corrugated cardboard hand-break preventing structure in which the crushing portion (9) is formed along the edge of the cardboard, the crushing portion (9) is orthogonal to the reference line (L) set parallel to the edge of the cardboard. Put a plurality of trunk ruled lines (10) in the direction to be close to the edge of the cardboard and branch ruled lines (11) intersecting the trunk ruled lines (10) to the trunk ruled lines (10 ) Intermittently and with the exception of the rear end portion of the trunk ruled line (10), the trunk ruled line (10) and the branch ruled line (11) are formed in a T shape. Corrugated cardboard hand cut prevention structure characterized by that.   The corrugated cardboard hand-break preventing structure according to claim 1, wherein the corrugated cardboard edge is cut into a corrugated shape and a trunk ruled line (10) is inserted corresponding to the bulging portion of the corrugated edge. .   The edge ruled line (12) is continuously inserted along the edge between the edge of the cardboard and the tip of the trunk ruled line (10). Corrugated cardboard hand cut prevention structure.   The inner flap (4) is connected to the pair of side plates (2), the outer flap (5) is connected to the other side plate (1), and the inner flap (4) and the outer flap (5) are bonded together. A corrugated cardboard carton, wherein the structure for preventing breakage of corrugated cardboard according to any one of claims 1 to 3 is adopted at least at the edge of the outer flap (5).   In order to manufacture the corrugated cardboard carton according to claim 4, a plurality of stem pressing pieces (23) for inserting stem ruled lines (10) are provided side by side in a direction perpendicular to the cutting edge (22) for punching the edge of the cardboard. The branch pressing piece (24) for inserting the branch pressing ruled line (11) is provided so as to intersect with each of the trunk pressing pieces (23), and the trunk pressing piece (23) and the branch pressing piece (24) are T Die-cutting corrugated cardboard sheet.

Images