JP2004123186A - Carton for preventing powder spill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carton which prevents the occurrence of a gap in the corner of a box for making it difficult for a power or a granular product to be spilled. <P>SOLUTION: This relates to a seal-end type paper carton whose adjoining inside and outside flaps connected to the opening of a tubular body part seal the opening of the same. In making the box, the base part bordering the adjoining inside flap and the outside flap is formed in one connected by a thin back layer without being cut off, the back layer of the outer flap is peeled, a flipper shaped corner fin able to cover a wide area including the base part of the inside flap and the corner of the carton protruding toward the outside flap is formed in one with the inside flap, and when the outer flap is folded the corner fin is folded on the inside flap. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a paper carton suitable mainly for storing powdery or granular products such as detergents.
[0002]
[Prior art]
Conventionally, when filling or packing powdery or granular contents, four rectangular side plates are connected in one direction, inner and outer flaps for sealing are connected continuously above and below the four side plates, and the inner and outer flaps are attached. In addition, paper cartons that are boxed in a substantially rectangular or square shape are widely used.
In such a paper carton, when assembling a carton blank, which is a box material, with a cartoning machine, the eight corners of the box may not be correctly bent at 90 degrees from the fold, and a small gap may be formed at the corner. If a gap is formed, moisture may be absorbed from the gap during storage of the product, or the contents may leak from the carton during transportation and use.
[0003]
As a paper box for preventing leakage from a corner portion, four side plates and a glue margin piece are successively provided via fold lines (a, b, c, d) as shown in FIG. An upper surface plate, an upper surface inner plate, and two upper folding pieces are connected to each other at upper end sides of the four side plates via fold lines (e), respectively, and at lower end sides of the four side plates, The lower plate, the lower inner plate, and the two lower folding pieces are connected to each other via the fold line (f), and the side plate and the glue margin piece are adhered to each other. A paper box for powder which is formed by folding the lower folding piece and bonding the upper plate and the upper inner plate and the lower plate and the lower inner plate to form a rectangular parallelepiped box. At the intersections of the corresponding fold lines (a, b, c, d) and the fold lines (e, f), short half-cut lines 50 continuous with the fold lines are provided. There is a thing that has become. (For example, see Patent Document 1 below)
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 7-35312
The paper box described in the above publication, after bonding the side plate and the glue margin piece, folds the two upper folding pieces and the lower folding piece into the upper board, the upper inner board, and the lower board and the lower inner board. Are glued to form a rectangular parallelepiped box, but when the accuracy of right angle is difficult due to variation in filling operation and folding operation in the box making process, the short half-cut line 50 allows the crease line to be bent at right angle accurately. In this case, the corners of the powder box made in a rectangular parallelepiped shape are prevented from expanding, and no gap is formed in the corners, thereby preventing leakage of the contents.
[0006]
[Problems to be solved by the invention]
However, this conventional technique does not cut off the surface of the base at the boundary between the inner and outer flaps adjacent to each other in the carton and does not cause a gap in the corner, so that not only the corner of the carton but also a wide area including the corner is provided. It cannot cover the surface area. Therefore, during transportation, storage, or during use, the box bulges or distorts, creating a gap at the base of the flap, or hitting or dropping the box during handling, causing the box corner to fall. However, it has not yet completely solved the disadvantage that powder or granular products leak out from corners.
[0007]
In view of the above, the present invention provides a method of automatically forming web-like corner fins in the corner portion of a box in a box making process so that a gap that causes leakage of contents does not occur. An object of the present invention is to provide a paper carton capable of preventing leakage of powdery or granular contents.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the powder leakage preventing paper carton of the present invention employs the following means.
In a paper carton of a seal end type that seals the opening by adjacent inner and outer flaps connected to the opening of the cylindrical body,
The base portion of the boundary between the adjacent inner flap and outer flap is formed as a continuous state integrally with a thin back layer portion without being separated, and the back layer of the outer flap is peeled off, and the base portion of the inner flap is removed from the base portion. A web-shaped corner fin that can cover a wide area including the corner of the carton so as to protrude to the outer flap side is formed integrally with the inner flap, and when the outer flap is bent, the corner fin is placed on the inner flap. It is characterized by folding and box making.
[0009]
The root portion of the boundary between the adjacent inner flap and outer flap is engraved with a linear front half cut cut from the front side of the flap to about half of the thickness of the paper, and the outer flap is cut in the thickness of the paper from the back side of the flap. An arc-shaped back half-cut that is cut to approximately half is engraved, and the web-like corner fins are formed on the back layer of the outer flap.
Furthermore, a ruled line is provided from the back surface from the center of the arc to the circumference so as to bisect the arc.
[0010]
The corner fins are provided at at least four corners located at the bottom of the seal end carton.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a carton blank according to a first embodiment. The blank 10 is formed from paperboard, but if necessary, a paper or a composite material obtained by laminating a paper and a paperboard with a surface treatment such as moisture proofing can be used.
[0012]
In the carton shown in this embodiment, a pair of rectangular side plates 11 forming a long surface (long surface) among the opposing side surfaces of the carton and a rectangular plate forming a short surface (width surface) are provided at the center of the blank 10. The end plate 12 is alternately provided in one direction via a folding line.
An outer flap 14 for the bottom surface is provided on the lower edge of the side plate 11, and an outer flap 16 for the top surface is provided on the upper edge via a folding line. On the other hand, an inner flap 15 for the bottom surface is provided at the lower edge of the end plate 12, and an inner flap 17 for the top surface is provided at the upper edge via the folding line. Reference numeral 13 is a glue margin piece continuously provided at an end of the blank 10.
[0013]
In the present invention, the dimension F1 in the length direction of the bottom outer flap 14 is formed to be substantially equal to the length W in the width direction of the end plate 12 constituting the width surface of the carton, and the bottom outer flaps 14 are folded on each other. The entire bottom surface of the box is closed. The dimension F2 in the length direction of the top outer flap 16 is formed substantially equal to the length W in the width direction of the end plate 12 constituting the width face of the carton, and the outer flaps 16 for the top face are folded over each other. The top of the box is sealed.
[0014]
The outer flaps 14, 14 for the bottom surface and the inner flaps 15, 15 for the bottom surface are provided with the following powder leakage prevention mechanism which is a feature of the present invention.
That is, the boundary between the adjacent outer flaps 14 and inner flaps 15 is separated except for the base portion. In other words, the root portion of the boundary between the outer flap 14 and the inner flap 15 is formed integrally and continuously.
FIG. 2 is an enlarged plan view of part A of FIG. 1 as viewed from the front side of the flap. As shown in FIG. 2, a linear half cut 20 (front half cut) cut from the front side of the flap to about half the thickness of the blank is engraved at the base of the boundary line that defines the inner and outer flaps. .
[0015]
FIG. 4 shows an enlarged plan view of part A in FIG. 1 as viewed from the back side of the flap. As shown in FIG. 4, an arc-shaped (sector-shaped) half cut 21 (back half cut) cut out from the back side of the flap to about half of the paper thickness is engraved on the back surface of the outer flap 14. The arc-shaped back half cut 21 is formed in a substantially quadrant. The radius of the arc depends on the size of the carton, but in the case of a detergent storage carton container containing 500 g, for example, about 7 mm to 15 mm is preferable.
Further, in the present invention, it is preferable to provide a ruled line from the back surface from the center of the arc to the circumference so as to bisect the arc in the arc-shaped fin of the above-mentioned quadrant. Thereby, the fins are correctly folded in the correct direction when the inner flap is folded by the automatic machine. The ruled line is not displayed in FIG. 1 but is displayed as a dotted line 61 in FIG.
[0016]
FIG. 3 shows a cross-sectional view of the blank at the half-cut portion described above. As shown in the drawing, a front half cut 20 and a back half cut 21 are engraved on the outer flaps 14 and 14 for the bottom surface and the inner flaps 15 and 15 for the bottom surface. Peeling from the box 14 results in web-like corner fins 22 for preventing powder leakage from the box corners as described later.
[0017]
In this embodiment, a powder leakage prevention mechanism similar to the above-described powder leakage prevention mechanism on the bottom surface is also formed at the root of the outer flap 16 for the top surface and the inner flap 17.
That is, the boundary between the adjacent outer flaps 16 for the top surface and the inner flaps 17 is separated except for the root portion.
The root portions of the outer flap 16 and the inner flap 17 are the same as the bottom surface (see FIG. 2), and the root portion defining the inner and outer end flaps is a straight half cut from the front side of the flap to approximately half the thickness of the blank paper. Cut 20 (front half cut) is engraved. Similarly to FIG. 4, an arc-shaped half cut 21 (back half cut) cut from the back side of the flap to approximately half of the paper thickness is engraved on the back surface of the outer flap 16. The back half cut 21 is formed in a quadrant.
Although there is no particular limitation on the paperboard used for the box of the present invention, a paperboard obtained by laminating a multi-layered white paperboard mainly composed of waste paper and kraft paper is preferable. By making the kraft paper layer the back layer (the inner layer of the box), the corner fins can be peeled off cleanly without breaking, and can be folded accurately.
[0018]
Although not an essential requirement of the present invention, an opening zipper 19 may be provided in advance near the upper ends of the side plate 11 and the end plate 12 so as to easily open the box as shown. The zipper 19 is constituted by a break line 18 formed by a perforation, a half-cut state interrupted line, a tear line with a joint, or the like, and is separated from the box body into an elongated band shape when opened.
[0019]
In order to assemble the carton blank 10, the side plate 11 and the end plate 12 are sequentially bent, and a glue margin piece 13 is attached to the opposite end plate 12 to be connected in a square tube shape. This carton can be stored in a flat folded state until assembled.
At the time of filling the contents into the carton and making the box, the blank is raised into a rectangular tube shape, and then the bottom surface of the carton is bent in the order shown in FIGS.
First, as shown in FIG. 6, the outer flaps 14 for the bottom surface are bent outward from the side plate 11 from the state of FIG. 5. At this time, the back half cut 21 and the front half cut 20 are broken, the paper layer on the back surface of the outer flap is peeled off, and the web-shaped corner fins 22 are formed.
Next, the bottom inner flaps 15, 15 are bent inside the end plate 12 (see FIG. 7). At this time, the webbed corner fins 22 are almost folded in half. Next, the corner fins 22 are folded on the folded bottom inner flap 15, and the bottom outer flap 14 is folded and glued to adhere the bottom outer flaps 14 to each other.
The corner fins 22 formed at the four corners of the bottom surface of the box are integrally continuous with the three surfaces of the side plate 11, the end plate 12 and the inner flap 15 for the bottom surface and the root portion of the flap, and are folded together with the flap when the bottom surface is sealed. As a result, not only the corners of the carton but also a wide area including the corners is covered to prevent the formation of small gaps at the base of the flap.
[0020]
After sealing the bottom, contents such as powder detergent are filled into the carton. After the filling operation is completed, the top surface is sealed similarly to the bottom surface (see FIG. 8).
[0021]
As described above, the eight corners of the base of the flap are formed with the web-shaped corner fins 22, respectively. Therefore, when the flap is bent, even if the corner part does not bend exactly at a right angle, it can be formed at the base of the flap. There is no gap. Also, when the shape of the carton is collapsed due to the bulging of the box, no gap is formed at the base of the flap.
Therefore, even if the carton falls over during transportation, storage or use, it is possible to prevent the leakage of the contents from the corners of the carton.
[0022]
FIG. 9 shows a blank sheet before assembling showing a second embodiment of the present invention.
The material of the blank 23 is the same as the blank 10 of the first embodiment. The different points will be described below. Numerals 13, 13a and 13b are glue margin pieces.
Above the end plate 12a, a content take-out port 25 is formed.
[0023]
The configuration of the powder leakage prevention mechanism provided on the bottom outer flap 14 and the bottom inner flap 15 and the configuration of the powder leakage prevention mechanism provided on the top outer flap 16 and the top inner flap 17 are the same as those of the first embodiment. Since they are the same, the description is omitted.
[0024]
Further, since the method of assembling the blank 23 is a conventional method, a detailed description will be omitted. Also in this embodiment, the front half cut 20 and the rear half cut 21 are broken, and the corner fins 22 are peeled off from the back surface of the outer flap 16. That is, after the inner flap 17 is bent inward, the corner fins 22 are folded over the flap, and the outer flap 16 is further folded outside (see FIG. 10).
[0025]
As shown in FIG. 11, the carton of the above embodiment breaks the break line 24, opens the takeout port 25 inward or outward, tilts the carton, and shakes out the contents for use.
[0026]
FIG. 12 shows a blank sheet before assembling a carton according to the third embodiment. In the carton, inner flaps and outer flaps are alternately connected to end sides of four wall plates constituting a quadrangular cylindrical body through a folding line, and both end faces of the body are connected to the inner and outer flaps. This is a seal-end type paper carton that is sealed by a seal.
A front plate 34, a bottom plate 35, a back plate 36, and a top plate 37 are connected in the longitudinal direction at the center of the blank 30. At the lower edge of the top plate 37, a product outlet 39 for opening the product by a break line 38 is provided. The engraved front flap 43 is continuously provided, and a connecting flap 33 is continuously provided on an upper end edge of the front plate 34.
Side flaps 32 for sealing both end faces of the quadrangular cylindrical body are connected to the top plate 37 and the bottom plate 35 via a folding line, and the rear plate 36 and the front plate 34 have outer side flaps. The flaps 31 are continuously provided via a folding line.
The boundary between the adjacent outer flap 31 and inner flap 32 is cut off leaving a root portion. At the root, a linear front half cut 40 is cut from the flap surface side to approximately half of the paper thickness.
On the outer flap 31 side, an arc-shaped back half cut 41 cut into approximately half of the paper thickness is formed.
When the inner and outer flaps 31 and 32 are bent to close the opening surface, the front half cut 40 and the rear half cut 41 are broken, and as a result, a web-shaped corner fin 42 is formed at each of the eight corners at the root of the flap. Therefore, when the flap is bent, no gap is generated at the base of the flap even if the corner portion does not bend exactly at a right angle. Also, when the shape of the carton is collapsed due to the bulging of the box, no gap is formed at the base of the flap.
[0027]
The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments. For example, the back half cut for forming the corner fins is formed in an arc shape, but is not limited to this.
[0028]
【The invention's effect】
As described above, the present invention not only leaves the base surface layer at the boundary of the inner and outer flaps adjacent to the carton without cutting, but also peels off the back layer of the outer flap when bending the outer flap, Since the web-formed corner fins that can cover not only the corners but also the wide area including the corners are formed integrally with the inner flap, the corners can be accurately formed when the inner and outer flaps are folded during box making. Even if it is not bent at a right angle, a small gap (pinhole) does not occur at the base of the flap. Also, even if the carton bulges during use or if the corners are damaged, there is no gap in the corners, and the leakage of powder and granular contents from the corners is prevented. Can be.
In addition, the corner fins are provided not only at the four corners of the bottom of the carton but also at the four corners of the top, so that the contents leak from the corners of the carton when the carton is rolled over during transportation and during use. Can be prevented.
The corner fins are formed by peeling the back layer of the outer flap and folded on the inner flap during automatic filling and cartoning of the carton, so that the cost is not increased and the assembly is easy.
[Brief description of the drawings]
FIG. 1 is a plan view of a blank showing one embodiment of a carton according to the present invention.
FIG. 2 is an enlarged plan view of part A in FIG. 1 as viewed from the surface.
FIG. 3 is a sectional view of a portion A in FIG. 1;
FIG. 4 is an enlarged plan view of part A in FIG. 1 as viewed from the back.
FIG. 5 is a perspective view showing a state where the trunk portions are connected during the assembly of the carton of the embodiment.
FIG. 6 is a perspective view showing a state in which the outer end flap is spread outward during the sealing of the carton bottom surface in the embodiment.
FIG. 7 is a perspective view showing a state where the inner end flap is bent inward during the sealing of the bottom surface of the carton of the embodiment.
FIG. 8 is a perspective view showing a sealed state of the carton.
FIG. 9 is a plan view of the carton blank of the second embodiment.
FIG. 10 is a perspective view of the carton of the embodiment in the middle of sealing the top surface.
FIG. 11 is a perspective view of the carton of the embodiment in a state in which a takeout opening is opened.
FIG. 12 is a plan view of a carton blank of a third embodiment.
FIG. 13 is a perspective view showing an assembled state of the carton of the embodiment.
FIG. 14 is a perspective view of the carton of the embodiment in an opened state.
FIG. 15 is a plan view of a blank showing a conventional example.
[Explanation of symbols]
10, 30 blank 11 side plate 12 end plate 13 glue margin 14 bottom outer flap 15 bottom inner flap 16 top outer flap 17 top inner flap 18, 24, 38 break line 19 zipper 20, 40 half cut 21, 41 Half cut 22, 42 Corner fin 25, 39 Product outlet 31 Side outer flap 32 Side flap 33 Connecting flap 34 Front plate 35 Bottom plate 36 Back plate 37 Top plate 43 Front flap 61 Ruled line of corner fin

Claims (4)

In a paper carton of a seal end type that seals the opening by adjacent inner and outer flaps connected to the opening of the cylindrical body,
The base portion of the boundary between the adjacent inner flap and outer flap is formed as a continuous state integrally with a thin back layer portion without being separated, and the back layer of the outer flap is peeled off, and the base portion of the inner flap is removed from the base portion. A web-shaped corner fin that can cover a wide area including the corner of the carton so as to protrude to the outer flap side is formed integrally with the inner flap, and when the outer flap is bent, the corner fin is placed on the inner flap. A powder leakage prevention carton characterized by being folded and boxed. The root portion of the boundary between the adjacent inner flap and outer flap is engraved with a linear front half cut cut from the front side of the flap to about half the thickness of the paper, and the outer flap is cut in the thickness of the paper from the back side of the flap. 2. The powder leakage prevention carton according to claim 1, wherein an arc-shaped back half cut that is cut to approximately half is engraved to form the web-like corner fins on the back surface layer of the outer flap. . The powder leakage prevention carton according to claim 2, further comprising a ruled line from the back surface extending from the center of the arc to the circumference so as to bisect the arc. 4. The powder leakage prevention carton according to claim 1, wherein the corner fins are provided at at least four corners located at the bottom of the seal end carton. 5.

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