Single stage cushioning material

Abstract

To provide a cushioning material which can fill gaps of various sizes generating between an object to be packaged and a packaging box with a small number of paper materials, whose environmental load is small, and which can be discarded easily in a state that is not bulky.SOLUTION: A single stage cushioning material is formed by overlapping a wave-form base paper 1 curved in a wave-like shape and forming stages repeatedly and a flat-shaped flat base paper 2, and by fastening the flat base paper 2 at a stage bottom part of the wave-form base paper 1. The stage height from a surface of the flat base paper 2 to a stage top part of the wave-form base paper is made to be equal to or higher than 20 mm. In packaging, it is filled in a gap between a commercial product G and a packaging box B, and it suppresses the movement of the commercial product G inside the packaging box B. The wave-form base paper 1 and the flat base paper 2 are bound at a fastening part 3 and fastened without using an adhesive agent, a cutting-off line 4 is formed between the fastening parts 3 of adjacent stages, and the single stage cushioning material can be cut and separated along the cutting-off line 4.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a cushioning material for protecting an item contained in a packaging box. [Background technology]

[0002] When shipping products purchased through mail order over the Internet, a packaging form is often adopted that prevents the product G from moving inside the packaging box B and protects the product G from shocks during transportation by filling the gap between the product G and the packaging box B with air cushioning material 61 made of a resin film with a continuous inflated bag portion filled with air, as shown in Figure 6, or by filling the gap between the product G and the packaging box B with rolled-up thick bogus paper 71, as shown in Figure 7.

[0003] However, the air cushioning material 61 may not fit into the narrow gap between the product G and the packaging box B, and the bogus paper 71 requires a large amount of paper material for each package, which not only makes it costly, but also raises concerns that the poor appearance when the package is opened may affect the impression of the product G.

[0004] Furthermore, when disposing of the package after unpacking, the air cushioning material 61 becomes very bulky unless the inflated bag portion is crushed, and the bogus paper 71 becomes very bulky unless it is stretched flat and folded.

[0005] Instead of such air cushioning material 61 or bogus paper 71, it is also possible to use cushioning materials such as those described in Patent Documents 1 to 4 below.

[0006] Patent Document 1 describes a cushioning material consisting of single-faced corrugated cardboard with a flat liner bonded to one side of a corrugated core, with an adhesive applied to the top of the corrugated core and attached to a product to provide cushioning properties, while Patent Document 2 describes a cushioning material in which only both sides of the single-faced corrugated cardboard core are bonded to the liner, increasing the core's freedom of deformation, and the packaged item is placed on the top of the corrugated core with a top plate interposed between them.

[0007] Furthermore, Patent Document 3 describes a cushioning material made of synthetic resin foam molded into a wave shape, and Patent Document 4 describes a cardboard cushioning material that consists of a zigzag plate bent into a wave shape and sandwiched between flat upper and lower plates, in which the folded parts of the zigzag plate are inserted into multiple parallel slits formed in the upper and lower plates and the material is cut to the required length along the perforated cutting lines cut into the upper and lower plates. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Utility Model Application Publication No. 62-99554 [Patent Document 2] Japanese Patent Application Publication No. 7-61474 [Patent Document 3] Japanese Utility Model Application Publication No. 53-22780 [Patent Document 4] Japanese Patent Application Publication No. 11-227835 Summary of the Invention [Problem to be solved by the invention]

[0009] However, the cushioning material described in Patent Document 1 can only be used in narrow gaps between the packaged item and the packaging box because the corrugated core height is at most about 5 mm according to the cardboard specifications, and the adhesive may cause a burden on the environment. Also, the cushioning material described in Patent Document 2 is limited to use at the bottom of the packaging box to receive the packaged item.

[0010] In addition, the cushioning material described in Patent Document 3 is made of synthetic resin, and therefore there is a risk of placing a burden on the environment when it is disposed of. The cushioning material described in Patent Document 4 cannot be folded to fill the gap between the packaged item and the packaging box, and there is also the problem that it requires a large amount of cardboard to be used.

[0011] To provide a cushioning material that can fill gaps of various sizes occurring between the packaged item and the packaging box with a small amount of paper, has a small environmental impact, and can be easily disposed of in a non-bulky state. [Means for solving the problem]

[0012] In order to solve the above problems, the present invention provides a single-step cushioning material in which a corrugated base paper that is curved in a corrugated shape and repeatedly forms steps is overlapped with a flat base paper, and the flat base paper is fixed to the bottom of the steps of the corrugated base paper at a fixing portion, The flute height from the surface of the plain base paper to the flute top of the corrugated base paper is 20 mm or more, The present invention provides a single-stage cushioning material that is stuffed into the gap between the packaged item and the packaging box to suppress movement of the packaged item inside the packaging box.

[0013] Furthermore, in this single-stage cushioning material, the corrugated base paper and the plain base paper are bound together and fixed at the fastening portion without using any adhesive.

[0014] Further, a cut line is provided along the bottom of the corrugated base paper between the fixed portions of adjacent columns.

[0015] The distance d between the fixed portion and the cut line is ensured to be 2.5 mm or more.

[0016] In addition, when the Taber stiffness of the corrugated base paper is T (mN m), the run rate is a, and the run height is H (m), the forming difficulty index calculated as T × a / H must be 500 or less.

[0017] In addition, when the compressive strength is R (kN / m), the step ratio is a, and the step height is H (m), the strength index calculated by R x a / H is greater than 41. Effect of the Invention

[0018] The single-tier cushioning material of the present invention has a tier height of 20 mm or more by bonding corrugated base paper and plain base paper together. By appropriately elastically deforming the corrugated base paper in accordance with the gap between the packaged item and the packaging box, it can be packed into gaps of various sizes that arise between the packaged item and the packaging box, thereby preventing the packaged item from moving inside the packaging box.

[0019] In addition, by using corrugated and plain paper with appropriate stiffness according to the characteristics of the packaged goods and the mode of transportation, excellent cushioning properties can be obtained, and unlike air cushioning material, which loses its cushioning properties once it is broken, this cushioning property is not lost even when subjected to multiple impacts from being dropped.

[0020] In addition, since it is made entirely from paper, less base paper is used as a material compared to single-faced corrugated cardboard or its laminates, which have a low flute height and many flutes per unit length, resulting in a smaller environmental impact.

[0021] Furthermore, by cutting lines along the bottom of the corrugated paper, it can be cut to the required length with the necessary steps depending on the inner dimensions of the packaging box and the shape of the packaged items, allowing the number of pieces to be stuffed into the gap between the packaged items and the packaging box to be adjusted.

[0022] In addition, when the corrugated base paper and the plain base paper are bound together at a fastening portion without using adhesive, the corrugated base paper can be flattened simply by pulling the corrugated base paper to release the fastening from the plain base paper, and can be easily disposed of in a non-bulky state. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is an overall perspective view of a single-stage cushioning material according to an embodiment of the present invention, and an enlarged view of a fastening portion; [Diagram 2] An explanatory diagram showing the definition of the above-mentioned advance rate [Diagram 3] FIG. 2 is a perspective view showing the state of cutting along the cutting line of the above embodiment; [Figure 4] FIG. 2 is a plan view showing the state of packaging using the single-layer cushioning material of the same embodiment; [Diagram 5] FIG. 1 is a perspective view showing a flattened state in which the corrugated base paper and the plain base paper are released from their fixed state; [Figure 6] A plan view showing the state of packaging using conventional air cushioning material. [Figure 7] FIG. 1 is a plan view showing the state of packaging with the above-mentioned Bogus paper. [Figure 8] Table and graph showing the G value of each step height of the single-step cushioning material according to the embodiment of the present invention [Figure 9] Table and graph showing the G value of each step rate [Figure 10] Table and graph showing the G value of each basis weight of the above [Figure 11] Table and graph showing the G value of each step height when the impact of the above is weakened [Figure 12] Table and graph showing G values ​​when the impact is strengthened as above DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] <Embodiments of single-layer cushioning material> (shape) Fig. 1 shows an embodiment of the single-corrugated cushioning material according to the present invention. This single-corrugated cushioning material is made by overlapping a corrugated base paper 1, which is curved in a corrugated shape and forms repeated corrugations, with a flat base paper 2 without such corrugations, and the plain base paper 2 is fixed to the bottom of the corrugations of the corrugated base paper 1. The corrugation height H of the corrugated base paper 1 is 20 mm or more, which is extremely large compared to ordinary single-faced corrugated board.

[0025] The value of the flute height H of the corrugated base paper 1 was set after confirming that it satisfied the conditions for moldability described below and provided sufficient cushioning performance through performance evaluation.

[0026] The corrugated base paper 1 and the plain base paper 2 are bound together and fixed at a fastening part 3 without using adhesive. This fastening is achieved, for example, by a so-called stapleless stapler that folds a part of the paper to staple it together, or by a method in which the overlapped paper is clamped and pressed with the uneven surfaces of metal teeth.

[0027] Along the bottom of the corrugated base paper 1, in the area between the fastening parts 3 of adjacent base papers, there are cut lines 4 in the form of perforations that are intermittently cut into the corrugated base paper 1 and the plain base paper 2. If the fastening parts 3 and the cut lines 4 are too close, the fastening parts 3 will tear and the corrugated shape of the corrugated base paper 1 will be lost, so the distance d is set to 2.5 mm or more.

[0028] (stage repetition rate) In manufacturing such single-step cushioning material, the corrugated paper 1 is fed out faster than the plain paper 2, and the corrugated paper 1 and the plain paper 2 are intermittently fixed together at the fixing portion 3. The step height H of the corrugated paper 1 and the length of each step are determined by the step ratio, and as shown in Figure 2, if the length of one step of the corrugated paper 1 is L1 and the length of the plain paper 2 between both ends of each step is L2, then the step ratio is expressed as L1 / L2.

[0029] (Use of single-layer cushioning material) When using this single-section cushioning material, it is cut to the required length and number of sections along the cut lines 4 at the bottom of the corrugated paper 1 to which the plain paper 2 is attached, as shown in Figure 3. At this time, the single-section cushioning material can be cut into individual sections as the minimum unit.

[0030] 4, product G, which is the item to be packed, is placed in packaging box B, and each cut piece of single-stage cushioning material is stuffed into the gap between product G and packaging box B according to the gap between product G and packaging box B. At this time, in the part where the gap between product G and packaging box B is narrow (the part surrounded by the dashed line in the figure), the corrugated base paper 1 can be elastically deformed so as to be appropriately compressed, so that it can be stuffed into the gap.

[0031] This reliably prevents the product G from moving inside the packaging box B, and excellent cushioning can be obtained by using corrugated base paper 1 and plain base paper 2 with appropriate stiffness depending on the characteristics and transportation form of the product G. Also, unlike air cushioning material, which loses its cushioning properties once it is broken, the cushioning properties are not lost even if it is subjected to impacts from being dropped multiple times.

[0032] In addition, since it is made entirely of paper rather than synthetic resin foam and does not use adhesives or glue, and uses less base paper as material compared to single-faced corrugated cardboard and its laminates, which have a low flute height and many flutes per unit length, it has a smaller environmental impact.

[0033] (Discard) When disposing of the single-stage cushioning material removed from packaging box B after opening the above-mentioned package, as shown in Fig. 5, the corrugated base paper 1 is pulled in the lengthwise direction to release the connection between the corrugated base paper 1 and the plain base paper 2 at the connection portion 3. This causes the corrugated base paper 1 to be flattened so that it overlaps the plain base paper 2, and it can be easily disposed of in a non-bulky state.

[0034] <Molding conditions> The stiffness of the paperboard measured by a Taber stiffness tester in accordance with JIS P 8125-2 is hereinafter referred to as Taber stiffness. We attempted to manufacture the above-mentioned cushioning materials using corrugated base paper 1 and plain base paper 2 with various characteristics. We then calculated the forming difficulty index of the cushioning material from the following relational expression using the base paper's Taber stiffness T, run rate a, and run height H, and confirmed the conditions under which the cushioning material can be formed. T×a / H= cushioning material molding difficulty index The larger the Taber stiffness T, the more difficult it is to form a corrugated shape. Also, the larger the step ratio a, the smaller the wave pitch at the same step height, making it more difficult to form a corrugated shape, whereas the higher the step height H, the easier it is to form a corrugated shape. Table 1 shows the molding difficulty index and evaluation of the cushioning material under each condition. [Table 1] The results of this verification showed that if the cushioning material has a molding difficulty index of ≦500, it is possible to produce a cushioning material by molding the corrugated base paper 1 into a corrugated shape.

[0035] <Performance evaluation> The performance of various cushioning materials was evaluated using an impact tester that measures the impact value (G value) when a weight is dropped on the cushioning material. The cushioning materials were made of materials with a basis weight of 120 to 280 g / m2. 2The corrugated base paper used was 1.2 to 1.8 in., with a corrugation ratio of 1.2 to 1.8 and a corrugation height of 20 to 100 mm. Those with an impact value of less than 100 G were deemed to have passed, and those with an impact value of 100 G or more were deemed to have failed.

[0036] (Evaluation by strength index) The ring crush strength measured in accordance with JIS P 8126 is hereinafter referred to as the compressive strength. Using an impact testing machine that measures the impact value when a falling weight hits the paper, a 340g falling weight was dropped from a height of 150mm, and the strength index of the cushioning material was calculated using the following formula using the compressive strength R of the base paper, the run rate a, and the run height H. R×a / H=Strength index of cushioning material The larger the compressive strength R, the stronger the corrugation. Also, the larger the step ratio a, the smaller the wave pitch at the same step height and the stronger the corrugation. Conversely, the higher the step height H, the weaker the corrugation and the more easily it is crushed and deformed by the impact of a falling weight. Table 2 shows the strength index and performance evaluation of the cushioning material based on the impact drop test. [Table 2] Based on the results of this verification, it was determined that a cushioning material has an excellent cushioning function if its strength index is greater than 41.

[0037] (G value measurement for each step height) The G-values ​​detected for the cushioning material of each step height when a 340g weight was dropped from a height of 150mm are shown in the table and graph in Figure 8. This cushioning material has a basis weight of 170g / m 2 The base paper used shall have a page ratio of 1.5.

[0038] Thus, when the step height is 80mm or less, the G value is equal to or less than that of an air cushioning material with a thickness of about 50mm after three drops, demonstrating sufficient cushioning performance.When the step height is 100mm, the impact value exceeds 100G after one drop, indicating insufficient cushioning performance.

[0039] (G value measurement for each step rate) The G-values ​​detected for the cushioning material with each step ratio when a 340g weight was dropped from a height of 150mm are shown in the table and graph in Figure 9. This cushioning material has a basis weight of 170g / m 2 The base paper used shall be 20 mm high. Thus, for all cushioning materials with step ratios between 1.2 and 1.8, the G value is equal to or less than that of an air cushioning material with a thickness of approximately 50 mm up to the third drop, demonstrating sufficient cushioning performance. However, after three drops, the impact value exceeds 100G and the cushioning performance becomes insufficient.

[0040] (G value measurement for each basis weight) The G-values ​​detected for cushioning materials made of base paper of each basis weight when a 340g weight was dropped from a height of 150mm are shown in the table and graph in Figure 10. The cushioning materials have a rung ratio of 1.5 and a rung height of 20mm. Thus, the larger the basis weight, the G value was equal to or less than that of an air cushioning material with a thickness of approximately 50 mm, demonstrating sufficient cushioning performance and being able to withstand many drops.

[0041] (G-value measurement with weakened impact) The G-values ​​detected for the buffer material of each step height when a 340g weight was dropped from a height of 50mm are shown in the table and graph in Figure 11. The buffer material has a step height of 20 to 100mm with a step ratio of 1.5. Thus, when the step height is 80mm or less, the G value is equal to or less than that of an air cushioning material with a thickness of approximately 50mm up to the fifth drop, demonstrating sufficient cushioning performance.When the step height is 100mm, the G value is less than that of an air cushioning material with a thickness of approximately 50mm up to the second drop.

[0042] (G-value measurement when the impact is increased) The G-values ​​detected for the cushioning material of the present invention after each drop when a 500 g weight was dropped from a height of 550 mm are shown in the table and graph of Figure 12. This cushioning material has a basis weight of 170 g / m 2 The base paper used shall have a step ratio of 1.5 and a step height of 20 mm. Thus, the G value at the first drop was lower than that of the air cushioning material with a thickness of about 50 mm, and it provided cushioning that was somewhat superior to that of the air cushioning material. This air cushioning material broke during the first drop, making it impossible to measure it after the second drop.

[0043] (Product fixation through vibration testing) Basis weight 120g / m 2 , 170g / m 2 , 280g / m 2 The above three types of base paper were used to form the cushioning material into layers with a layer height of 40 mm and a layer ratio of 1.5. The cushioning material was then packed into packaging box B, which also contained the product, and a vibration test was conducted in accordance with JIS Z 0232:2020 Packaged cargo - Vibration test method. In this vibration test, the product load was set to 2 kg, and random vibration was applied in the Z-axis direction → Y-axis direction → X-axis direction for 30 minutes each, and the condition of the cushioning material was checked after each vibration in each direction was completed. As a result, no crushing or shifting of the cushioning material was observed in any of the packages using cushioning materials made from base paper of any basis weight, and the product was kept in a fixed position. [Explanation of symbols]

[0044] 1 Corrugated base paper 2 plain paper 3. Attachment 4 Cut line B. Packing box G product

Claims

1. A single-step cushioning material in which a corrugated base paper that is curved into a wave shape and repeatedly forms steps is overlapped with a flat base paper, and the flat base paper is fixed to the bottom of the steps of the corrugated base paper at a fixing portion, The flute height from the surface of the plain base paper to the flute top of the corrugated base paper is 20 mm or more, A single-tier cushioning material that is stuffed into the gap between the packaged item and the packaging box to prevent the packaged item from moving inside the box.

2. 2. The one-stage cushioning material according to claim 1, wherein the corrugated base paper and the plain base paper are bound together and fixed at the fastening portion without using an adhesive.

3. 3. The single-section cushioning material according to claim 1, wherein a perforation line is provided along the bottom of the corrugated base paper between the fixed portions of adjacent sections.

4. 4. The one-stage cushioning material according to claim 3, wherein a distance d between the fixed portion and the cut line is ensured to be 2.5 mm or more.

5. The one-stage cushioning material according to claim 1, characterized in that the forming difficulty index is not more than 500. However, the forming difficulty index is calculated by T×a / H, where T (mN·m) is the Taber stiffness of the corrugated base paper, a is the run rate, and H (m) is the run height.

6. The single-section cushioning material according to claim 1, characterized in that the strength index is greater than 41. However, the strength index is calculated by R x a / H, where R is the compressive strength (kN / m), a is the section rate, and H is the section height (m).

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