JP6528371B2 - Paper container - Google Patents

Description

  The present invention relates to a paper container which has been subjected to easy-opening processing so as to be easy to open. In particular, the present invention relates to a paper container in which back surfaces of both ends of one blank sheet are laminated and box-made.

  As the easy opening process of the paper container, a perforation process which penetrates the entire thickness of the paper is most commonly used. In the case of a paper box that does not particularly require sealing, such as an outer box of canned beer and an outer box of individually packaged confectionery, there is no problem even with perforations penetrating the paper layer, but some degree of sealing In the case of the required paper container, it can not apply.

  In order to develop a certain degree of sealability, there is one which is provided with an opening band. For example, in the case of a powder detergent paper container, the outside of the box may be exposed to water, and the contents are required to have some degree of moisture resistance. For this reason, in the case of a powder detergent paper container, for example, a polyethylene film is laminated on the front and back of the paper to ensure water resistance and moisture resistance, and the opening method is slightly offset from the planned opening line. An opening band is adopted which is subjected to a half cutting process from the front and back surfaces and is opened using layer peeling of paper.

  As with paper containers for powder detergents, when the paper thickness is thick, the open area is stable because the allowable range for half cutting is wide, but when the paper thickness is thin, the half cutting depth Due to the narrow tolerance range, there is a problem that the opening band deviates from the original planned opening line and the paper is torn or broken depending on the variation in the depth of half cutting.

  In order to solve such a problem, two parallel surface half-cut lines are formed on the surface of the paper as an opening band, and two parallel parallel lines are formed on the back surface of the paper. There is a proposal of forming a back half line and further providing an auxiliary half line between two back half lines (Patent Document 1).

  In addition, two surface half-cut lines penetrating the surface coating layer on the surface of the paper to reach the paper layer and parallel to the inside of the surface half-cut line and penetrating the back surface coating layer to reach the paper layer A plurality of back half cuts having two back half cuts and diagonally opposite to the front half cut line from the back half cut line in a direction opposite to the front half cut line and penetrating through the back coat layer to reach the paper layer There is a proposal of a paper container having an auxiliary line (Patent Document 2).

  Although these proposals have the effect of preventing tearing and tearing of the paper layer in the opening band, they are paper containers in which the back surface of the opening end of the opening band and the end surface overlap and are stuck. However, in a paper container formed by bonding back surfaces of both ends of one blank sheet to form a box, the back surface of the opening end of the opening band is bonded to the back surface of the end. Therefore, when these proposals are applied to such a paper container and opened from the opening end of the opening band, the paper layer between the front surface half line and the rear surface half line on the back surface is not separated. In some cases, the paper layer may delaminate between the two back half-slits, causing the paper layer to be exposed to the center of the opening band, or the paper layer torn or broken. There is a problem with The factor is that the adhesion strength between the opening end and the opening end of the opening band is stronger than the interlayer strength of the paper layer between the opening end and the end, so the opening end or end is also between the two back half lines at the time of opening. This is because the paper layer of the layer causes delamination.

JP, 2009-62078, A Unexamined-Japanese-Patent No. 2013-193771

In the present invention, in view of the problems of the background art, in the paper container to which the back surface of the opening end of the opening band is stuck, the paper layer is exposed to the central portion of the opening band even when the opening is made from the start end. It is an object of the present invention to provide a paper container which can be opened cleanly without tearing or tearing of the paper layer .

  In order to solve the above-mentioned subject, inventors conducted earnest examination and completed the present invention.

In the invention according to claim 1 of the present invention, the back surfaces of both ends of the blank sheet in which the coating layer is laminated on the front and back surfaces of the paper layer are attached to form an attached portion, and the open band is circulated. A paper container,
The tear band has two surface half-scores penetrating the surface skin layer to reach the paper layer, and in parallel between the two surface half-scores, penetrating the back surface skin layer And two back half-cut lines to reach the paper layer,
And on the back end of the tear strip has a plurality of straight backside half cutting auxiliary line to reach the paper layer through the backside coating layer so as to straddle the rear surface half cutting line, the rear surface half cutting aid It is a paper container characterized in that the adhesion strength between the start end and the end is reduced by a line.

  The invention according to claim 2 of the present invention is characterized in that the shape of the back surface half-cut auxiliary line is a V shape in which the central portion of the back surface half-cut auxiliary line faces toward the start end of the opening band. The paper container according to claim 1.

  The invention according to claim 3 of the present invention is the paper container according to claim 1, characterized in that the back surface half-cut auxiliary line has a square shape.

The paper container of the present invention is a container to which the back surfaces of the opening end and the opening end of the opening band are attached, and the paper layer is exposed up to the central portion of the opening opening or the paper layer It can be opened cleanly without tearing or breaking .

Also, the tear strip has two surface half-scores that penetrate the surface coating layer to reach the paper layer, and in parallel between the two surface half-scores, penetrating the back surface coating layer It has two back half lines reaching the paper layer, and on the back side of the end of the opening zone, a plurality of back half lines extending through the back surface coating layer to reach the paper layer across the back half line The paper layer between the front surface half line and the back surface half line is delaminated even if it is opened from the start end of the opening band, and the sheet can be opened cleanly. The paper layer is exposed up to the center of the opening band, and the paper layer can be opened cleanly without tearing or tearing.

  In addition, the shape of the back surface half cutting auxiliary line is between the two back surface half cutting lines by being in a V shape where the central part of the back surface cutting auxiliary line faces toward the start end of the opening band. Delamination of the start or end paper layer can be prevented and can be opened more cleanly.

  In addition, since the shape of the back surface half cutting auxiliary line is a square back surface cutting line, it is possible to prevent the delamination of the paper layer of the start end or the end between two back surface cutting lines, It can be opened more beautifully.

Even if it is opened from the opening end of the opening band in order to reduce the adhesive strength between the start end and the end by forming a plurality of back half cut auxiliary lines so as to straddle the two back half cut lines, Delamination of the start or end paper layer can be prevented.

It is an explanatory view showing an example of a blank sheet which forms a paper container concerning the present invention. It is explanatory drawing which shows an example of the paper container which assembled the blank sheet | seat of FIG. The end of the open band of the blank sheet is shown. It is explanatory drawing which shows the other shape of a back surface half-cut auxiliary line. It is an explanatory view showing an example of a section of an opening belt. It is an explanatory view showing the state at the time of opening an opening belt. It is an explanatory view showing the state where the opening belt is opened. It is explanatory drawing which shows an example of the other shape of the paper container of this invention.

  Hereinafter, modes for carrying out the present invention will be described.

  FIG. 1 is an explanatory view showing an example of a blank sheet for forming a paper container according to the present invention. The surface of the blank sheet 2 is shown. Sticking pieces 5, 5 'for bonding the back surfaces of the blank sheet to each other are formed at both ends of the blank sheet 2, and the front plate 3 and the back plate 4 are connected via the vertical bending line a. It is done. Further, the first top plate 6 is connected to the upper portion of the surface plate 3 and the first bottom plate 7 is connected to the lower portion via the curved bending line b. Further, the second top panel 8 is connected to the upper portion of the back plate 4 and the second bottom plate 9 is connected to the lower portion via the curved bending line b.

  In addition, when assembling into a paper container, an opening band is formed at a desired opening position. The tear strip 10 has two surface half-scores 11 which penetrate the surface coating and reach the paper layer, and in parallel between the two surface half-scores and penetrating the back surface It has two back surface half-cut lines 12 that reach the paper layer, and on the back surface of the end 21 of the opening band, a plurality of penetrations through the back surface coating layer across the two back surface half-cut lines 12 to reach the paper layer The back half cut auxiliary line 13 is formed. In addition, an opening knob 23 corresponding to the width of the two front surface half-cut lines 11 is formed to project from the end edge of the adhesive piece 5 connected to the front plate.

  FIG. 2: is explanatory drawing which shows an example of the paper container which assembled the blank sheet | seat of FIG. The bending line a is bent so that the front plate 3 and the back plate 4 are opposed to each other, and then the curved bending line b is bent so that the first top plate 6 and the second top plate 8 are on the upper side. Similarly, the bending and bending line b is bent to overlap and bond the first bottom plate 7 and the second bottom plate 9 so that the first bottom plate 7 is on the upper side. Next, the back surfaces of the adhesive pieces 5 and 5 'are adhered to each other to form an adhesive part 16. A cylindrical paper container 1 is shown. Further, the opening band 10 is connected to the picker 23 and is formed from the start end 20 around the body 17 of the paper container to the end 21. The start end 20 and the end 21 are attached to form a start end / end attachment 22. When the picker 23 is pulled in the opening direction, the opening band 10 is cut off by the two front half lines 11 on the surface of the start end 20 and the two back half lines 12 on the back, and the two back sides. A plurality of back half cutting auxiliary lines 13 formed across the half cutting line 12 are cut, the start end and the end are peeled off, and the paper layer between the front half cutting line and the back half cutting line is sequentially delaminated and opened Be done.

  FIG. 3 shows the end of the opening band of the blank sheet. As shown in FIG. 3A, the end 21 has two front half lines 11 on the front surface, and straddles two rear half lines 12 and the two rear half lines 12 on the rear surface. As described above, a plurality of back surface half-cut auxiliary lines 13 are formed. 3-2 is explanatory drawing which showed the start end / end adhesion | pasting part 22 in which the back surfaces of the start end and the end were bonded together. The start end / end attachment portion 22 has two surface half lines 11 on the surface of the start end, and the back surface of the end has two parallel surface lines between the two surface half lines. The back half line 12 of the book is formed. Further, on the back surface of the end 21, a plurality of back surface half cutting line auxiliary lines 13 are formed so as to straddle the two back surface half cutting lines 12.

FIG. 4 is an explanatory view showing another shape of the back surface half cut auxiliary line. As shown in FIG. 4A, a plurality of V-shaped back surface half-score auxiliary lines 14 are formed on the back surface of the end, with the central portion facing toward the start end of the opening band so as to straddle the two back surface half-scores 12. It is formed. 4-2 is explanatory drawing which showed the start end / end adhesion | pasting part 22 in which the back surfaces of the start end and the end were bonded together. The start end / end attachment portion 22 has two surface half lines 11 on the surface of the start end, and the back surface of the end has two parallel surface lines between the two surface half lines. The back half line 12 of the book is formed. In addition, a plurality of V-shaped back surface half cutting line auxiliary lines 14 are formed on the back surface of the end 21 so as to straddle the two back surface half cutting lines 12.
Further, in FIG. 5, a plurality of square-shaped back surface half-cut line auxiliary lines 15 are formed on the back surface of the end so as to straddle the two back surface half-cut lines 12. By forming a plurality of back surface half cutting auxiliary lines, the adhesion strength between the start end and the end is reduced, and the delamination of the paper layer of the start end or the end is prevented even when opened from the start end of the opening band. Can. By doing this, it is possible to open the opening band cleanly.

  FIG. 6 is an explanatory view showing an example of a cross section of the opening band. The laminated sheet 30 forming the paper container has a front surface coating layer 31 on the front surface of the paper layer 32, and a rear surface coating layer 33 on the rear surface. The opening band 10 has two surface half-cut lines 11 penetrating the front surface coating layer 31 to reach the paper layer 32, and in parallel between the two surface half-cut lines 11, the back surface coating layer 33 has two back surface half-cut lines 12 reaching the paper layer 32 and on the back surface of the end of the opening band, the paper passes through the back surface coating layer so as to straddle the two back surface half-cut lines A plurality of straight back half cut auxiliary lines reaching the layer are formed. In addition, in FIG. 6, since it becomes difficult to understand, the back surface semi-solid line auxiliary line is omitted. When the tear strip 10 is unsealed, the paper layer between the front half line 11 and the back half line 12 is delaminated to form a delaminated portion 34 and unsealed. Therefore, the paper layer is protected by the front and back coating layers, and the front half and back half cut lines are provided with a predetermined gap, so that the front and back sides of the paper are connected by the cut. There is no part that is doing. For this reason, a paper container can exhibit a certain degree of moisture resistance and water resistance by selecting the material of the film of front and back.

  FIG. 7 is an explanatory view showing a state in which the opening band is opened. When the picking part 23 is picked up and pulled in the opening direction c and the opening band 10 is opened, the front half line 11 on the surface of the start end and the back half line 12 on the back are cut off at the start end / end adhesion part 22 And, the back side cutting auxiliary line is also cut, and the paper layer between the front side cutting line 11 and the back side cutting line 12 is delaminated. The paper layer between the front half line 11 and the back half line 12 is sequentially delaminated to form an unsealing portion 35 and opened.

  Furthermore, a mode for carrying out the present invention will be described.

As paper layers used for the paper container according to the present invention, manila cardboard, white cardboard, chip cardboard, yellow cardboard, coated cardboard, double-faced cardboard, back white cardboard, ivory paper, etc. are used. As a basis weight of a paper layer, 160-850 g / m < ² > paper is used.

  Moreover, the material and thickness of a surface film layer and a back surface film layer are not specifically limited, For example, a low density polyethylene film, a medium density polyethylene film, a linear low density polyethylene film, a high density polyethylene film, a polypropylene film, a polyester film And films having heat fusion property.

  Moreover, as a method of bonding the said film together to a paper layer, it is possible by the dry lamination method through an adhesive layer. As the adhesive, for example, a two-component curable urethane adhesive, a polyester urethane adhesive, a polyether urethane adhesive, an acrylic adhesive, a polyester adhesive, a polyamide adhesive, an epoxy adhesive, etc. It can be used. In addition to the dry lamination method, a low density polyethylene resin can be extruded and bonded by an extrusion sand poly method. It is also possible to coat a heat fusible resin on a paper layer to form a surface coating layer and a back surface coating layer.

  Moreover, as a method of forming a front surface half cut line, a back surface half cut line, and a back surface half cut line auxiliary line in a lamination sheet, it is possible by the method by a blade, and the method of using a laser. It is possible to use a flat press or a rotary cutter using a punch equipped with a Thomson blade.

  Further, as a method of punching a laminated sheet into a blank sheet, it is possible to use a flat press or a rotary cutter using a punching die equipped with a Thomson blade. The blank sheet punched into a desired shape can be made into a paper container by sack sticking or other forming processing.

  The paper container of the present invention is a paper container assembled by pasting back surfaces of both ends of one blank sheet to form a sticking part. The shape of the paper container can also be a square paper container as shown in FIG. In order to open the paper container, a sticking portion 16 having a pick portion 23 for opening is formed, and a tear strip 10 connected to the pick portion 23 orbits the trunk portion of the paper container from the start end 20 It is formed up to the end 21.

  Hereinafter, specific examples of the present invention will be described.

A low density polyethylene film 15μ was extrusion laminated on both sides of a ^two sided card paper having a basis weight of 250 g / m ² to prepare a laminated sheet.

  Next, using this laminated sheet, a blank sheet as shown in FIG. 1 was prepared. The width of the front and bottom plates 80 mm × height 160 mm, width of the attached pieces 10 mm × height 160 mm, the first top plate, second top plate and first bottom plate, second bottom plate 27 mm in height Created. At this time, an opening band is formed on the blank sheet, two surface half-cut lines are formed in parallel on the surface, and two back surface half-cut lines are formed 5 mm inside of the surface half-cut line on the back surface. And formed an open band 25 mm wide. In addition, on the back surface of the end of the opening band, four back surface half cutting line auxiliary lines were formed at equal intervals so as to straddle the two back surface half cutting lines. The surface half cut line, the back half cut line, and the back half cut line auxiliary line were performed by a flat press using a cutting die equipped with a Thomson blade. In addition, the external shape removal processing was also performed by a flat press using a punching die equipped with a Thomson blade. At this time, a knob was also formed at the outer edge of the start end with the width of the opening band.

  Next, the back surfaces of the sticking pieces of the above-mentioned blank sheet were pasted together to form a sticking part, and as shown in FIG. The cylindrical paper container in which the opening band connected with the knob part was circulated was created.

  Below, the comparative example of this invention is demonstrated.

Comparative Example
A cylindrical paper container was formed in the same manner as in Example 1 except that the back surface half-cut auxiliary line was not formed.

<Evaluation method>
The picking part was picked and opened in the opening direction, and the state of the opening part was confirmed.

<Evaluation result>
In the example, even when the opening end of the opening end was opened, the paper layer was exposed up to the central portion of the opening band, and the sheet layer could be opened cleanly without tearing or tearing . However, in the comparative example, the paper layer may be exposed to the central portion of the opening band, or the paper layer may be torn or shredded , so that the paper can not be opened beautifully.

DESCRIPTION OF SYMBOLS 1 paper container of this invention 2 blank sheet 3 surface plate 4 back surface plate 5 sticking piece 5 'sticking piece 6 1st top plate 7 1st bottom plate 8 2nd top plate 9 2nd bottom plate 10 opening belt 11 surface half Cutting line 12 back half cutting line 13 back half cutting auxiliary line 14 square shaped back half cutting auxiliary line 15 square back half cutting auxiliary line 16 sticking part 17 paper container body 20 start end 21 end 22 start Edge / end attachment portion 23 Picking portion 30 Laminated sheet 31 Surface film layer 32 Paper layer 33 Back surface film layer 34 Delamination portion of paper layer 35 Opened portion 40 Other paper container of the present invention a Vertical bending line b Curved shape Folding line c opening direction

Claims (3)

It is a paper container which is formed by sticking back surfaces of both ends of a blank sheet in which a coating layer is laminated on the front and back surfaces of a paper layer to form a sticking portion, and having an opened band which is circulated,
The tear band has two surface half-scores penetrating the surface skin layer to reach the paper layer, and in parallel between the two surface half-scores, penetrating the back surface skin layer And two back half-cut lines to reach the paper layer,
And on the back end of the tear strip has a plurality of straight backside half cutting auxiliary line to reach the paper layer through the backside coating layer so as to straddle the rear surface half cutting line, the rear surface half cutting aid A paper container characterized in that the adhesion strength between the start end and the end is reduced by a line .   2. The paper container according to claim 1, wherein the shape of the back surface half cutting auxiliary line is a V shape in which the central portion of the back surface cutting auxiliary line faces toward the start end of the opening band.   The paper container according to claim 1, wherein the back surface half cutting auxiliary line has a square shape.

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