JP7602253B2 - Manufacturing method for paper cushioning material for individual fruit packaging - Google Patents

Description

The present invention relates to a method for manufacturing paper cushioning material used for individually packaging fruits such as apples and peaches.

Conventionally, a packaging and cushioning material called a fruit net (also called a fruit cap) has been used to protect fruits such as melons and apples. Fruit nets are made from synthetic resin foam sheets that are molded into a net shape. Cylindrical fruit nets are also used to cover glass or ceramic bottles to prevent them from breaking. However, because fruit nets are made from bulky synthetic resin foam sheets, there is a problem in that they require a large amount of space for storage. Furthermore, because they are made from synthetic resin, they are not desirable from the perspective of protecting the global environment, such as the recent trend toward eliminating plastics.

For this reason, the applicant proposed a cylindrical paper cushioning material instead of a synthetic resin cushioning material (Patent Document 1). This cylindrical paper cushioning material 20 is a planar material in which a first paper and a second paper with long, zigzag cuts 2 are laminated, the cuts 2 of each paper are synchronized, and both longitudinal edges are bonded with adhesive to a longitudinal bonding area 3 (Fig. 1). When this planar paper cushioning material is stretched in the width direction, the paper body 1 between the cuts 2, 2 rises vertically to the surface direction and becomes mesh-like, and if a glass bottle or ceramic bottle is inserted between the first and second papers, it becomes a cylindrical cushioning material. Therefore, since it is planar during storage and cylindrical during use, it is preferable because it does not take up much space during storage. In addition, from the viewpoint of protecting the global environment, such a paper cushioning material is preferable.

The manufacturing method of the cylindrical paper cushioning material 20 proposed by the applicant is as shown in Figure 2. First, adhesive 13 is applied to both longitudinal edges of a long first paper 11 while it is being transported by a coating device 15, and then a long second paper 12 is superimposed on the first paper 11 to obtain a laminated paper 14. The laminated paper 14 is then transported to the position of a cutter 16 equipped with a linear cutting blade 19, and the cutter 16 is lowered toward a receiving table 17 to create a staggered cut 2. Then, a cutter 18 equipped with a cutting blade extending in the width direction of the laminated paper 14 is lowered toward the receiving table 17 to cut the laminated paper 14, obtaining a cylindrical paper cushioning material 20.

The cylindrical paper cushioning material 20 obtained by this method is suitable for use as a cushioning material for the exterior of glass bottles or ceramic bottles, but when used as an individual packaging material and cushioning material for fruit, the fruit may fall out of the bottom of the tube. For this reason, it was thought that it would be sufficient to glue one opening of the cylindrical paper cushioning material 20 and provide a bottom for the tube. In other words, an attempt was made to intermittently provide a width-bonded area in which the first and second papers are bonded in the width direction, and to use this width-bonded area as the bottom. However, in order to provide a width-bonded area, the conveyance of the first and second papers must be stopped for a long period of time. In other words, it is necessary for the bonding of the first and second papers to be fixed, for example, for the adhesive to set in the case of a solution-based adhesive such as a water-soluble adhesive, for the adhesive to set in the case of a pressure-sensitive adhesive, and for the adhesive to fuse in the case of a heat-sensitive adhesive, and conveyance must be stopped during this time, which is a drawback in that the paper cushioning material cannot be produced rationally.

Patent No. 6746163

The objective of the present invention is to provide a method for efficiently producing paper cushioning material without stopping the transport of the first and second sheets of paper.

The present invention solves the above problem by utilizing the manufacturing method shown in FIG. 2 and providing a non-cut region where there is no cut line made by the cutter 16, and by making this region the bottom of the tube. That is, the present invention relates to a method for manufacturing a paper cushioning material for individual packaging of fruit, which includes the cut region, the non-cut region, and a part of the adjacent cut region, and is characterized by comprising a first step of obtaining a laminated paper having a longitudinally bonded region in which both longitudinal edges of a long first paper and a long second paper are bonded with an adhesive; a second step of alternately providing cut regions with staggered cuts in the longitudinal direction and non-cut regions with no cuts in the width direction of the laminated paper in a region other than the longitudinally bonded region of the laminated paper; and a third step of cutting the laminated paper in the width direction at a position near the boundary between the cut region and the non-cut region and including a part of the adjacent cut region.

[Definition of terms]
In the present invention, the term "staggered cuts" refers to cuts in adjacent rows that are shifted by approximately half a degree, and cuts are present at any position perpendicular to the rows of cuts.
In the present invention, the term "slit region" refers to a region where staggered slits exist.
In the present invention, the term "non-slit region" refers to a region where no slits exist in a position perpendicular to the row of slits.
In the present invention, "near the boundary between a cut region and a non-cut region" means a position that includes the boundary between a cut region and a non-cut region and a part of the adjacent cut region.

According to the manufacturing method of the present invention, a cylindrical paper cushioning material with a base formed by the non-slit region and a part of the adjacent slit region can be obtained by the third step. Therefore, the step of fixing, fixing or fusing the adhesive in the width direction in the first step can be omitted, and a cylindrical paper cushioning material with a base can be obtained rationally. Therefore, even if the cylindrical paper cushioning material obtained by the manufacturing method of the present invention is used as a paper cushioning material for individually wrapping fruit, the fruit is unlikely to fall out of the bottom. In addition, this cylindrical paper cushioning material has the effect of not being bulky because it is flat before the fruit is individually wrapped, and has the effect of being suitable for protecting the global environment because it is made of paper.

FIG. 2 is a plan view of a tubular paper cushioning material obtained by the method described in Patent Document 1. 1A to 1C are schematic side views showing a manufacturing process for a tubular paper cushioning material or a manufacturing process for a paper cushioning material according to an example of the present invention. FIG. 2 is a plan view showing a cut region, a non-cut region, and the vicinity of a boundary between the cut region and the non-cut region. FIG. 2 is a plan view of a paper cushioning material for individual packaging of fruit obtained by a method according to one embodiment of the present invention.

First, a long first sheet 11 and a long second sheet 12 are prepared. The first sheet 11 and the second sheet 12 are generally prepared in the form of a roll as shown in FIG. ^2. Each sheet has a basis weight of about 50 to 120 g/m2. As each sheet, a conventionally known paper such as kraft paper or crepe paper can be used. However, since fruits such as peaches, which have a soft surface, are individually wrapped, it is preferable to use crepe paper, which has a soft surface, for each sheet. Then, adhesive 13 is applied to both longitudinal edges of the first sheet 11. As the adhesive 13, a commonly used pressure-sensitive adhesive, water-soluble adhesive, heat-sensitive adhesive, room temperature curing adhesive, or the like is used. If an acrylic pressure-sensitive adhesive or water-soluble adhesive that can be handled in liquid form is used, the adhesive 13 can be easily applied by extruding the adhesive 13 from a nozzle hole of an application device 15 equipped with a nozzle and applying it onto the first sheet 11 being conveyed.

After applying the adhesive 13, the second paper 12 is laminated on the first paper 11. The first paper 11 and the second paper 12 are then laminated with the applied adhesive 13 to obtain a laminated paper 14 having a longitudinal bonding region 3. If the first paper 11 is laminated with a heat-sensitive film on the entire surface, the step of applying the adhesive 13 is not necessary. That is, the first paper 11 is laminated with the second paper 12 so that the heat-sensitive film of the first paper 11 abuts against the second paper 12, and the regions that are to become both longitudinal ends are heated and, if necessary, pressurized to obtain a laminated paper 14 having a longitudinal bonding region 3. Here, the case where the heat-sensitive film is provided on the entire surface of the first paper 11 has been described, but the heat-sensitive film may be provided on the entire surface of the second paper 12, or may be provided on the entire surfaces of both the first paper 11 and the second paper 12. Generally, a polyethylene film is used as the heat-sensitive film.

The laminated paper 14 obtained in the first step is conveyed, and at the installation position of the cutter 16 equipped with the linear cutting blade 19, the cutter 16 is lowered toward the receiving table 17 to provide a cut area 21 with a staggered cut 2 in the longitudinal direction in the area other than the longitudinal bonding area 3 of the laminated paper 14. Next, after conveying the laminated paper 14, the cutter 16 is lowered toward the receiving table 17 to provide the trailing cut area 21 so that a non-cut area 22 is provided between the leading cut area 21 and the trailing cut area 21. With this method, the cut area 21 and the non-cut area 22 can be provided alternately and sequentially as shown in FIG. 3. In addition, when a rotary blade equipped with a cutting blade on the circumferential surface of a cylindrical body or a cylinder is used as the cutter 16, instead of a push cutting blade as shown in FIG. 2, a part of the circumferential surface where no cutting blade is provided may be arranged, and the cut area 21 and the non-cut area 22 may be provided alternately and sequentially. It is acceptable for staggered cuts 2 to be made in the longitudinal bonding region 3. This is because the first sheet 11 and the second sheet 12 will not peel off even if cuts 2 are made here.

At the same time as or after the second step, the laminated paper 14 is cut in the width direction near the boundary between the cut region 21 and the non-cut region 22 in the third step. It is preferable to perform the second and third steps simultaneously. Since the transport of the laminated paper 14 is generally stopped and transported intermittently in the second and third steps, the purpose of the third step is to reduce the number of stops and streamline the manufacturing process. The cutting position is near the boundary 23 between the cut region 21 and the non-cut region 22 shown in FIG. 3, and is a position 24 including a part of the adjacent cut region 21. If the cutting is performed at the boundary 23, if the cutting position is within the non-cut region 22 due to a slight positional deviation, both openings of the cylindrical paper cushioning material will be closed, which may result in a defective product. The position 24 is preferably a position where half of the last cut rows of the adjacent cut region 21 are present, as shown in FIG. 3, but it may be a position further down where all the cut rows are present.

In this way, a paper cushioning material for individual packaging of fruit is obtained, which has a cut region 21, a non-cut region 22, and a portion of the adjacent cut region, as shown in Figure 4. The paper cushioning material shown in Figure 4 was obtained when cutting at position 24, near boundary 23, which includes a portion of the adjacent cut region 21.

By using this paper cushioning material, stretching the cut region 21 in the width direction, standing the paper body 1 upright to form a net shape, and inserting fruit such as an apple or a peach between the first paper 11 and the second paper 12, the non-cut region 22 becomes the bottom of the tube, making it difficult for the fruit to fall out. Therefore, if fruit is individually wrapped in the paper cushioning material obtained by the method of the present invention, the surface of the fruit is less likely to be damaged, making it an ideal paper cushioning material for individually wrapping fruit.

REFERENCE SIGNS LIST 1 Paper body 2 Cut 3 Longitudinal bonding area 11 First sheet 12 Second sheet 13 Adhesive 14 Laminated paper 15 Coating device 16 Cutter 17 Receiving table 18 Cutter 19 Linear cutting blade 20 Cylindrical paper cushioning material 21 Cut area 22 Non-cut area 23 Boundary between cut area and non-cut area 24 Position near the boundary 23 including part of adjacent cut area 21

Claims (2)

A first step of obtaining a laminated paper having a longitudinal bonding region in which both longitudinal end edges of a long first paper sheet and a long second paper sheet are bonded together with an adhesive;
A manufacturing method for paper cushioning material for individual packaging of fruit, comprising a second step of alternately providing cut areas with staggered cuts in the longitudinal direction and non-cut areas with no cuts in the width direction of the laminated paper in an area other than the longitudinal bonding area of the laminated paper; and a third step of cutting the laminated paper in the width direction at a position near the boundary between the cut areas and the non-cut areas and including a portion of an adjacent cut area. The method for producing the paper cushioning material for individual packaging of fruit according to claim 1, in which the second and third steps are carried out simultaneously.

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