Paper cushioning material, manufacturing method of paper cushioning material, and manufacturing apparatus of paper cushioning material

Abstract

To provide a paper cushioning material which can be disposed at low cost with reduced time and labor.SOLUTION: A paper cushioning material 1 is configured so that first to-be-crashed portions 3 and second to-be-crashed portions 4 are alternately provided on a paper cylinder 2 at an interval in a longitudinal direction, the provision of the first to-be-crashed portions 3 and the second to-be-crashed portions 4 causes each portion between the first to-be-crashed portion 3 and the second to-be-crashed portion 4 of the paper cylinder 2 to be formed into a triangular pyramid 5, inner surfaces of the paper cylinder 2 in the first to-be-crashed portion 3 are caused not to adhere to each other, and the inner surfaces of the paper cylinder 2 in the second to-be-crashed portion 4 are also caused not to adhere to each other.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a paper cushioning material, a method for manufacturing the paper cushioning material, and an apparatus for manufacturing the paper cushioning material. [Background technology]

[0002] When shipping products sold through mail order sales, etc., cushioning material is often placed in the gap between the product and the packaging box to protect the product from vibrations and shocks during shipping. Conventionally, air cushioning material made of plastic film has been used as this cushioning material (for example, Patent Documents 1 and 2).

[0003] The air cushioning material made of plastic film in Patent Documents 1 and 2 is formed by alternately providing vertical and horizontal seal parts at intervals in the longitudinal direction of a film tube made of plastic film that extends continuously in the longitudinal direction, and forming the part between the vertical seal part and the horizontal seal part into a triangular pyramid. The vertical seal part is a part formed by flattening a part of the longitudinal direction of the film tube and bonding the inner surfaces of the crushed film tube together by heat sealing, and the horizontal seal part is a part formed by flattening a part of the longitudinal direction of the film tube from a direction perpendicular to the crushing direction of the vertical seal part and bonding the inner surfaces of the crushed film tube together by heat sealing. The triangular pyramid formed between the vertical seal part and the horizontal seal part is a bag filled with air.

[0004] Meanwhile, in recent years, paper cushioning materials have been attracting attention from the perspective of SDGs. For example, the paper cushioning materials described in Patent Documents 3 and 4 are known. The paper cushioning materials described in Patent Documents 3 and 4 are made by feeding a continuously extending band-like kraft paper from a paper feeder, and crumpling the band-like kraft paper by sandwiching it between a pair of rotating bodies and passing it through. However, the paper cushioning materials described in Patent Documents 3 and 4 have problems in that they look bad and require a large amount of material (kraft paper) to be used. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 3-43123 [Patent Document 2] Application No. 62-159366 [Patent Document 3] Special Publication No. 2008-518859 [Patent Document 4] Special Publication No. 2003-535716 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, the inventors of the present application considered whether it was possible to realize a paper cushioning material that uses less material and looks good. As a result of the consideration, the inventors came up with the idea of ​​forming an air cushioning material with a triangular pyramidal bag like those in Patent Documents 1 and 2 out of paper instead of plastic film, and produced a prototype of such a paper cushioning material.

[0007] The paper cushioning material prototyped here was a paper tube that extended continuously in the longitudinal direction, with vertical and horizontal seals alternately spaced apart in the longitudinal direction, forming the portion between the vertical and horizontal seals into a triangular pyramid. The vertical seal was made by crushing a portion of the paper tube in the longitudinal direction flat and bonding the inner surfaces of the crushed paper tube together by heat sealing, while the horizontal seal was made by crushing a portion of the paper tube in the longitudinal direction flat from a direction perpendicular to the crushing direction of the vertical seal and bonding the inner surfaces of the crushed paper tube together by heat sealing. The paper that made up the paper tube was pre-coated with a heat sealant to enable heat sealing.

[0008] However, it was found that the above-mentioned prototype paper cushioning material had the following problems.

[0009] That is, as in Patent Documents 1 and 2, the air cushioning material in which vertical and horizontal seals are alternately formed on a plastic film tube has low material costs because the plastic film itself is formed from a material suitable for heat sealing, whereas the above-mentioned prototype paper cushioning material (in which vertical and horizontal seals are alternately formed at intervals along the length of a paper tube) requires the use of paper that has been pre-coated with a heat sealing agent in order to enable heat sealing of the vertical and horizontal seals, which results in the problem of high material costs.

[0010] Furthermore, with the air cushioning made of plastic film as in Patent Documents 1 and 2, the air cushioning can be packed between the product and the packaging box for delivery, and then when it is time to dispose of the air cushioning, it can be easily made smaller by making a hole in the triangular pyramid-shaped bag part with scissors or the like and letting the air out. However, with the paper cushioning prototype described above, in which vertical and horizontal seals are formed alternately on a paper tube and the parts between the vertical and horizontal seals are formed into a triangular pyramid, when the paper cushioning is packed between the product and the packaging box for delivery, it is not easy to make the triangular pyramid-shaped bag part smaller because paper is more rigid than plastic film, and there is a problem that disposal of the paper cushioning is time-consuming.

[0011] In addition, because paper has low thermal conductivity, it takes a long time to heat seal the insides of the paper tube, and it takes several seconds to form one vertical or horizontal seal. Therefore, the paper cushioning material prototyped above is difficult to manufacture quickly.

[0012] The problem to be solved by this invention is to provide a paper cushioning material which is low cost and does not require much effort to dispose of. [Means for solving the problem]

[0013] The inventors of the present application noticed that in the above-mentioned prototype, when the paper tube was alternately crushed vertically and horizontally at intervals along the length to form a triangular pyramid, rather than bonding the inner faces of the crushed parts of the paper tube together by heat sealing, the shape of the triangular pyramid could be maintained even if the inner faces of the crushed parts of the paper tube were not bonded together, because paper is a material that easily creases. This led to the idea of ​​using triangular pyramids formed without bonding the inner faces of the crushed parts of the paper tube together as paper cushioning material.

[0014] Based on this idea, the present invention provides a paper cushioning material having the following configuration in order to solve the above problems. [Configuration 1] A paper tube extending continuously in a longitudinal direction has first crushed portions and second crushed portions alternately provided at intervals in the longitudinal direction, The first crushed portion is a portion in the longitudinal direction of the paper tube that is crushed flat, The second crushing portion is a portion of the longitudinal direction of the paper tube that is crushed flat in a direction different from the crushing direction of the first crushing portion when viewed from the longitudinal direction, The portion of the paper tube between the first crushed portion and the second crushed portion is formed into a triangular pyramid by providing the first crushed portion and the second crushed portion, The inner surfaces of the paper tube in the first crushed portion are not bonded to each other, The paper cushioning material is such that the inner surfaces of the paper tube at the second crushed portion are also not bonded to each other.

[0015] When this configuration is adopted, the inner surfaces of the paper tube are not heat-sealed and not bonded in the first and second crushing sections, so there is no need to use paper that has been pre-coated with a heat sealant, and material costs are low. In addition, when forming the first and second crushing sections, there is no need to heat-seal the inner surfaces of the paper tube, so the paper cushioning material can be manufactured quickly. Therefore, this paper cushioning material is low cost. In addition, the inner surfaces of the paper tube are not heat-sealed and not bonded in the first and second crushing sections, so when disposing of the paper cushioning material after use, the triangular pyramid can be broken simply by stretching the paper cushioning material in the longitudinal direction. Therefore, it is easy to reduce the size of the paper cushioning material after use, and disposal is not time-consuming.

[0016] [Configuration 2] The first crushed portion is provided with a pair of two-fold creases located at both ends in the extension direction of the first crushed portion, and a crease extending in the extension direction of the first crushed portion so as to intersect with the pair of two-fold creases, The paper cushioning material of configuration 1, wherein the second crushed portion also has a pair of two-fold creases located at both ends in the extension direction of the second crushed portion, and a fold extending in the extension direction of the second crushed portion so as to intersect with the pair of two-fold creases.

[0017] When this configuration is adopted, since a fold extending in the extension direction of the first crushed portion is provided, the fold prevents the folds at both ends of the first crushed portion in the extension direction from opening, and the shape of the first crushed portion can be stabilized. Similarly, since a fold extending in the extension direction of the second crushed portion is provided, the fold prevents the folds at both ends of the second crushed portion in the extension direction from opening, and the shape of the second crushed portion can be stabilized. Therefore, the shape of the triangular pyramid formed between the first crushed portion and the second crushed portion can be stabilized.

[0018] [Configuration 3] The first crushed portion has two or more folds including a mountain fold and a valley fold spaced apart in the longitudinal direction, The paper cushioning material according to configuration 2, wherein the second crushed portion has two or more folds, including a mountain fold and a valley fold, spaced apart in the longitudinal direction.

[0019] With this configuration, since the first crushed portion has both mountain folds and valley folds, the first crushed portion can be easily bent in either of the mountain fold and valley fold directions, and similarly, since the second crushed portion has both mountain folds and valley folds, the second crushed portion can be easily bent in either of the mountain fold and valley fold directions. Therefore, the paper cushioning material that extends continuously in the longitudinal direction can be bent as desired, and can be easily deformed according to the shape of the gap between the product and the packaging box.

[0020] [Configuration 4] Among the two or more creases provided in the first crushed portion, the length along the double fold from the crease located at one end in the longitudinal direction to the crease located at the other end in the longitudinal direction is set to 1 / 7 or more of the length of the extension direction of the first crushed portion, The paper cushioning material of configuration 3, wherein the length along the double fold from the fold located at one end in the longitudinal direction to the fold located at the other end in the longitudinal direction, among the two or more folds provided in the second crushed portion, is also set to be 1 / 7 or more of the length in the extension direction of the second crushed portion.

[0021] By adopting this configuration, the length of the folds at both ends of the first crushed portion in the extension direction is sufficiently secured, so that the shape of the first crushed portion is stable, and similarly, the length of the folds at both ends of the second crushed portion in the extension direction is sufficiently secured, so that the shape of the second crushed portion is also stable, so that it is possible to effectively stabilize the shape of the triangular pyramid formed between the first crushed portion and the second crushed portion.

[0022] [Configuration 5] The paper cushioning material according to any one of configurations 1 to 4, wherein the paper tube is formed by enveloping the front surface of one end of the width direction of the strip-shaped continuous paper and the back surface of the other end of the width direction of the continuous paper.

[0023] By adopting this configuration, it is possible to reliably prevent the product from being damaged by the paper cushioning material when it is filled into the gap between the product and the packaging box. In other words, it is possible to form a paper tube by gable gluing (a method in which the back surfaces of one end and the other end of a strip-shaped continuous paper in the width direction are overlapped and glued together) instead of envelope gluing, but in this case, the gable portion formed by gluing the back surfaces of one end and the other end of the continuous paper in the width direction has a shape that protrudes from the outer periphery of the paper tube when viewed from the longitudinal direction, so there is a risk that the product will be damaged by the tip of the gable portion coming into contact with the product (for example, holes or tears will occur in the shrink film that wraps the product). In contrast, when a paper tube is formed by envelope gluing, no part is formed that protrudes from the outer periphery of the paper tube when viewed from the longitudinal direction, so it is possible to reliably prevent the product from being damaged by the paper cushioning.

[0024] [Configuration 6] The paper cylinder is 50 to 280 g / m 2 6. The paper cushioning material according to any one of claims 1 to 5, which is formed of paper having a basis weight of 100 g / m2.

[0025] With this configuration, 50 g / m 2 Since the paper tube is formed from paper having a basis weight of 280 g / m or more, the paper has high rigidity and can effectively stabilize the triangular pyramid shape between the first and second crushed parts. 2 Since the paper tube is made of paper having the following basis weight, the cost of the paper cushioning material can be reduced.

[0026] The present invention also provides a method for producing the above-mentioned paper cushioning material, which has the following configuration. [Configuration 7] A paper tube continuously extending in a longitudinal direction is supplied from a paper tube supply unit; A pair of first crushing jigs are arranged opposite each other with the paper tube in between, and a portion of the paper tube in the longitudinal direction is clamped and crushed flat to form a first crushed portion in the paper tube in which the inner surfaces are not bonded to each other; a pair of second crushing jigs arranged opposite each other with the paper tube between them clamps and flattens a portion of the paper tube that is spaced apart from the first crushed portion in the longitudinal direction from a direction different from the crushing direction of the pair of first crushing jigs when viewed from the longitudinal direction, thereby forming a second crushed portion in the paper tube whose inner surfaces are not bonded to each other; A method for manufacturing paper cushioning material, in which the first crushed portion and the second crushed portion are alternately formed at intervals in the longitudinal direction on the paper tube supplied from the paper tube supply unit, thereby forming the portion of the paper tube between the first crushed portion and the second crushed portion into a triangular pyramid.

[0027] [Configuration 8] When the pair of first crushing jigs flatten a portion of the longitudinal direction of the paper tube to form the first crushed portion, the pair of first crushing jigs sandwich and crush the paper tube between a pair of opposing surfaces having a curved surface shape when viewed from the extension direction of the first crushed portion, thereby forming a pair of double folds at both ends in the extension direction of the first crushed portion and a fold that extends in the extension direction of the first crushed portion so as to intersect with the pair of double folds, The method for manufacturing paper cushioning material described in configuration 7, in which the pair of second crushing jigs flatten a portion of the paper tube spaced longitudinally from the first crushed portion to form the second crushed portion, by clamping and crushing the portion between a pair of opposing surfaces having a curved surface shape when viewed from the extension direction of the second crushed portion, thereby forming a pair of double folds at both ends in the extension direction of the second crushed portion and a fold that extends in the extension direction of the second crushed portion so as to intersect with the pair of double folds.

[0028] The present invention also provides a manufacturing apparatus for manufacturing the above-mentioned paper cushioning material, the manufacturing apparatus having the following configuration. [Configuration 9] a paper tube supply unit that supplies a paper tube that extends continuously in a longitudinal direction; a pair of first crushing jigs arranged opposite each other with the paper tube therebetween, which sandwich a portion of the paper tube in the longitudinal direction and crush it flat to form a first crushed portion in the paper tube, the inner surfaces of which are not bonded to each other; a pair of second crushing jigs arranged opposite each other with the paper tube therebetween, which sandwich and crush a portion of the paper tube spaced apart from the first crushed portion in the longitudinal direction from a direction different from the crushing direction of the pair of first crushing jigs as viewed from the longitudinal direction, thereby forming a second crushed portion in the paper tube whose inner surfaces are not bonded to each other; A paper cushioning material manufacturing device that forms the first crushed portion and the second crushed portion alternately at intervals in the longitudinal direction on the paper tube supplied from the paper tube supply unit, thereby forming the portion of the paper tube between the first crushed portion and the second crushed portion into a triangular pyramid.

[0029] [Configuration 10] The pair of first crushing jigs have a pair of opposing surfaces that sandwich and crush the paper tube therebetween, and the pair of opposing surfaces have a surface shape that is bent when viewed from the extension direction of the first crushed portion so as to form a pair of two-fold creases at both ends in the extension direction of the first crushed portion and a fold that extends in the extension direction of the first crushed portion so as to intersect with the pair of two-fold creases when the pair of opposing surfaces are crushed flat to form the first crushed portion, The pair of second crushing jigs have a pair of opposing surfaces that clamp and crush the paper tube between them, and the pair of opposing surfaces have a surface shape that is bent when viewed from the extension direction of the second crushed portion so as to form a pair of double folds at both ends in the extension direction of the second crushed portion and a fold that extends in the extension direction of the second crushed portion so as to intersect with the pair of double folds when the pair of second crushing jigs flatten a portion of the paper tube spaced longitudinally from the first crushed portion to form the second crushed portion. Effect of the Invention

[0030] In the paper cushioning material of this invention, the inner surfaces of the paper tube are not heat-sealed and not bonded in the first and second crushed sections, so there is no need to use paper that has been pre-coated with a heat sealant, and the material costs are low. In addition, when forming the first and second crushed sections, there is no need to heat-seal the inner surfaces of the paper tube, so the paper cushioning material can be manufactured quickly. Therefore, this paper cushioning material is low cost. In addition, in the first and second crushed sections, the inner surfaces of the paper tube are not heat-sealed and not bonded, so when disposing of the paper cushioning material after use, the triangular pyramid can be collapsed simply by stretching the paper cushioning material in the longitudinal direction. Therefore, it is easy to reduce the size of the paper cushioning material after use, and disposal is not time-consuming. [Brief description of the drawings]

[0031] [Figure 1] FIG. 1 is a perspective view of a paper cushioning material according to a first embodiment of the present invention; [Diagram 2] (a) is a plan view of the paper cushioning material in Fig. 1, and (b) is a diagram showing the state in which the paper cushioning material shown in (a) has been stretched in the longitudinal direction to break the triangular pyramid when it is disposed of. [Diagram 3] Cross-sectional view of the paper tube shown in Figure 2(b) [Figure 4] FIG. 4 is a comparative example in which the bonding method for one end and the other end of the continuous paper constituting the paper tube shown in FIG. 3 is changed from envelope bonding to flared bonding. [Diagram 5] FIG. 2 is a front view showing an example of a manufacturing apparatus for the paper cushioning material shown in FIG. [Figure 6] Plan view of Figure 5 [Figure 7] An enlarged view of the vicinity of the paper tube supply section in FIG. [Figure 8] Cross-sectional view taken along line VIII-VIII in FIG. 7. [Figure 9] Cross-sectional view taken along line IX-IX in Figure 7. [Figure 10] Cross-sectional view taken along line XX in Figure 7. [Figure 11] FIG. 7 is a plan view showing a state in which the moving frame shown in FIG. 6 is moved downstream by a frame driving device. [Figure 12]FIG. 12 is a plan view showing a state in which the paper tube is released from the second crushing jig shown in FIG. 11 and then the moving frame is moved upstream by the frame driving device. [Figure 13] FIG. 13 is a front view showing the state in which the paper tube is clamped and flattened by the first crushing jig from the state shown in FIG. 12. [Figure 14] FIG. 14 is an enlarged view of the pair of first crushing jigs shown in FIG. 13 and their vicinity; [Figure 15] FIG. 15 is a view of the vicinity of the first crushed portion formed by the first crushing jig shown in FIG. 14, viewed from the extending direction of the first crushed portion. [Figure 16] FIG. 15 shows a second embodiment of the present invention, corresponding to FIG. [Figure 17] FIG. 17 is a view of the vicinity of the first crushed portion formed by the first crushing jig shown in FIG. 16, viewed from the extending direction of the first crushed portion. [Figure 18] FIG. 15 shows a third embodiment of the present invention, corresponding to FIG. [Figure 19] FIG. 19 is a view of the vicinity of the first crushed portion formed by the first crushing jig shown in FIG. 18 from the extending direction of the first crushed portion; [Figure 20] FIG. 15 shows a fourth embodiment of the present invention, corresponding to FIG. [Figure 21] FIG. 21 is a view of the vicinity of the first crushed portion formed by the first crushing jig shown in FIG. 20, viewed from the extending direction of the first crushed portion. [Figure 22] FIG. 15 is a diagram showing a fifth embodiment of the present invention, corresponding to FIG. [Diagram 23] FIG. 23 is a view of the vicinity of the first crushed portion formed by the first crushing jig shown in FIG. 22 from the extending direction of the first crushed portion. [Figure 24] FIG. 2 is a front view showing another example of the paper cushioning material manufacturing apparatus shown in FIG. [Diagram 25] Plan view of FIG. [Figure 26] A schematic diagram showing the sample used in the vibration test (a product case placed in a cardboard box, with the paper cushioning material shown in Figure 1 stuffed between the inner surface of the cardboard box and the outer surface of the product case) viewed from above. [Figure 27] 27 is a schematic diagram showing the sample shown in FIG. 26 as seen from the front. [Figure 28]Photograph showing the paper cushioning removed from the sample after vibration testing DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Fig. 1 shows a paper cushioning material 1 according to a first embodiment of the present invention. This paper cushioning material 1 is formed by providing first crushed portions 3 and second crushed portions 4 alternately at intervals in the longitudinal direction on a paper tube 2 that extends continuously in the longitudinal direction, and by forming the portion between the first crushed portion 3 and the second crushed portion 4 into a hollow triangular pyramid 5.

[0033] The paper tube 2 is a paper tube formed by deforming a strip-shaped continuous paper 12 (see FIG. 5) into a cylindrical shape and pasting together one end 8 in the width direction and the other end 9 in the width direction. The paper constituting the paper tube 2 is 50 to 280 g / m 2 (Preferably 120 to 220 g / m 2 ) is used. The paper that constitutes the paper tube 2 is non-heat-sealable paper that is not coated with a heat-sealing agent, and the type of paper that can be used is kraft paper or cardboard base paper made from recycled paper (e.g., K-liner, C-liner, etc.). As shown in Fig. 3, the paper tube 2 is formed by envelope pasting, in which the front surface of one end 8 in the width direction of the continuous paper 12 (see Fig. 5) is overlapped with the back surface of the other end 9 in the width direction and bonded.

[0034] As shown in Figures 1 and 2(a), the first crushed portion 3 is a portion of the longitudinal direction of the paper tube 2 that is pinched from both sides in a direction perpendicular to the longitudinal direction (perpendicular to the paper surface in Figure 2(a)) and crushed flat. The first crushed portion 3 extends in a direction perpendicular to the longitudinal direction and perpendicular to the crushing direction of the first crushed portion 3 (up and down in Figure 2(a)). The inner surfaces of the paper tube 2 at the first crushed portion 3 are not bonded together with an adhesive such as a heat sealant, and are in a non-bonded state.

[0035] The second crushed portion 4 is a portion of the longitudinal direction of the paper tube 2 that is pinched from both sides in a direction perpendicular to the longitudinal direction (the vertical direction in FIG. 2(a)) and crushed flat. The second crushed portion 4 extends in a direction perpendicular to the longitudinal direction and perpendicular to the crushing direction of the second crushed portion 4 (the direction perpendicular to the paper surface in FIG. 2(a)). The crushing direction of the second crushed portion 4 is a direction perpendicular to the crushing direction of the first crushed portion 3 when viewed from the longitudinal direction. The inner surfaces of the paper tube 2 at the second crushed portion 4 are not bonded together with an adhesive such as a heat sealant and are in a non-adhesive state.

[0036] The second crushing unit 4 differs from the first crushing unit 3 only in the direction in which it crushes the paper tube 2, and other configurations are the same as those of the first crushing unit 3. Therefore, hereinafter, the configuration of the first crushing unit 3 will be described, and the corresponding parts of the second crushing unit 4 will be denoted by the same reference numerals and description thereof will be omitted.

[0037] As shown in Fig. 2(a), the first crushed portion 3 has a pair of double folds 6 located at both ends in the extension direction of the first crushed portion 3 (the up-down direction in Fig. 2(a)), and two folds 7 extending linearly in the extension direction of the first crushed portion 3 so as to intersect with the pair of double folds 6. The two folds 7 are creases formed by folding the paper tube 2 in a flattened state as viewed from the extension direction of the first crushed portion 3, as shown in Figs. 14 and 15.

[0038] 1, one of the two folds 7 is a mountain fold and the other is a valley fold. The two folds 7 are arranged parallel to each other at an interval in the longitudinal direction of the paper tube 2, and form the boundary between the first crushed portion 3 and the triangular pyramid 5 adjacent to the first crushed portion 3 on one side in the longitudinal direction, and the boundary between the first crushed portion 3 and the triangular pyramid 5 adjacent to the first crushed portion 3 on the other side in the longitudinal direction, respectively.

[0039] As shown in Figure 15, of the two folds 7 provided in the first crushing portion 3, the length H along the two folds 6 from one fold 7 to the other fold 7 is set to be 1 / 7 or more of the length W of the first crushing portion 3 in the extension direction shown in Figure 2(a).

[0040] As shown in Figure 1, the triangular pyramid 5 formed between the first crushed portion 3 and the second crushed portion 4 of the paper tube 2 is a triangular pyramid 5 with the first crushed portion 3 and the second crushed portion 4 as two sides at the twist position. The length of the first crushed portion 3 in the extension direction and the length of the second crushed portion 4 in the extension direction are the same. The length of the side connecting the first crushed portion 3 and the second crushed portion 4 of the triangular pyramid 5 is set to 1.2 to 2.0 times the length W of the first crushed portion 3 in the extension direction (see Figure 2 (a)).

[0041] An example of a manufacturing device for the above-mentioned paper cushioning material 1 will be described.

[0042] As shown in Figure 5, the manufacturing equipment for paper cushioning material 1 has a paper tube supply section 10 that supplies a paper tube 2 extending continuously in the longitudinal direction to the downstream side, and a triangular pyramid forming section 11 that forms a first crushed section 3 and a second crushed section 4 alternately and at intervals in the longitudinal direction on the paper tube 2 supplied from the paper tube supply section 10, thereby forming the portion of the paper tube 2 between the first crushed section 3 and the second crushed section 4 into a triangular pyramid 5.

[0043] The paper tube supply unit 10 includes a paper roll 13 around which a continuous paper strip 12 is wound, as shown in Fig. 5, a guide member (not shown) that gradually deforms the continuous paper strip 12 unwound from the paper roll 13 into a cylindrical shape along the direction of travel, as shown in Figs. 5 and 6, a gluing device 14 that applies glue to one widthwise end 8 of the continuous paper strip 12, as shown in Figs. 7 and 8, a pressing member 15 that presses the other widthwise end 9 against the one widthwise end 8 of the continuous paper strip 12 deformed into a cylindrical shape, as shown in Figs. 7 and 9, and a circular guide 16 that guides the outer periphery of the paper tube 2, as shown in Figs. 7 and 10. The circular guide 16 has a circular hole 17 that fits into the outer periphery of the paper tube 2, and the inner peripheral surface of the circular hole 17 slidably supports the outer periphery of the paper tube 2, thereby maintaining the cross-sectional shape of the paper tube 2 in a circular shape.

[0044] 5 and 6, the triangular pyramid forming section 11 has a pair of first crushing jigs 18 arranged facing each other with the paper tube 2 therebetween, and a pair of second crushing jigs 19 arranged facing each other with the paper tube 2 therebetween at a position upstream of the first crushing jigs 18. The pair of first crushing jigs 18 face each other in a direction perpendicular to the longitudinal direction, and the pair of second crushing jigs 19 also face each other in a direction perpendicular to the longitudinal direction. The opposing direction of the pair of first crushing jigs 18 and the opposing direction of the pair of second crushing jigs 19 are at right angles to each other when viewed from the longitudinal direction.

[0045] 5 and 13, a pair of first crushing jigs 18 are each attached with a first actuator 20, and by operating the first actuator 20, the first crushing jig 18 can be moved back and forth between a pressing position (position in FIG. 13) where a portion of the longitudinal direction of the paper tube 2 is clamped from both sides and crushed flat, and a pressing release position (position in FIG. 5) where the clamping is released. The first actuator 20 is, for example, a pneumatic cylinder.

[0046] 6 and 12, a pair of second crushing jigs 19 are also attached with second actuators 21, and by operating the second actuators 21, the second crushing jigs 19 can be moved back and forth between a pressing position (position in FIG. 6) where a portion of the longitudinal direction of the paper tube 2 is clamped from both sides and crushed flat, and a pressing release position (position in FIG. 12) where the clamping is released. The second actuator 21 is, for example, an air pressure cylinder.

[0047] Here, the direction in which the paper tube 2 is crushed by a pair of first crushing jigs 18 (the vertical direction in Figure 5) and the direction in which the paper tube 2 is crushed by a pair of second crushing jigs 19 (the direction perpendicular to the paper surface in Figure 5) are perpendicular to each other when viewed in the longitudinal direction.

[0048] A pair of second crushing jigs 19 differs from the first crushing jig 18 only in the direction in which the paper tube 2 is crushed, and other configurations are the same as the first crushing jig 18. Therefore, below, the configuration of the first crushing jig 18 will be explained, and the explanation of the second crushing jig 19 will be omitted by assigning the same reference numerals to corresponding parts.

[0049] As shown in FIG. 14, the pair of first crushing jigs 18 has a pair of opposing surfaces 22 that face each other with the paper tube 2 therebetween. The pair of opposing surfaces 22 have complementary shapes so as to crush the paper tube 2 flat when the paper tube 2 is sandwiched between them. Each opposing surface 22 has a surface shape bent at two V-shaped bent portions 23, 24 when viewed from the extension direction of the first crushed portion 3 (the direction perpendicular to the paper surface in FIG. 14). One of the two bent portions 23, 24 of each opposing surface 22 is a convex bent portion 23, and the other is a concave bent portion 24. The length of each opposing surface 22 along the extension direction of the first crushed portion 3 is greater than 1 / 2 the circumference of the paper tube 2 (= the length W of the first crushed portion 3 in the extension direction shown in FIG. 2(a)). As shown in Figure 14, when a portion of the longitudinal direction of the paper tube 2 is flattened, this pair of opposing surfaces 22 forms a pair of double folds 6 at both ends in the extension direction of the first crushed portion 3, and two folds 7 extending in the extension direction of the first crushed portion 3 so as to intersect with the pair of double folds 6, as shown in Figures 1 and 15.

[0050] 5 and 6, the first crushing jig 18, the second crushing jig 19, the first actuator 20, and the second actuator 21 are attached to a moving frame 26 that is supported by linear guides 25 so as to be movable in the longitudinal direction of the paper tube 2. The moving frame 26 is provided with a frame drive device 27 that reciprocates the moving frame 26 in the longitudinal direction of the paper tube 2.

[0051] An example of a method for producing paper cushioning material 1 (see FIG. 1) using the above-mentioned device will be described.

[0052] As shown in Figs. 5 and 6, a strip-shaped continuous paper 12 is unwound from a paper roll 13, and the continuous paper 12 is deformed into a cylindrical shape by a guide member (not shown). As shown in Figs. 7 and 8, a glue application device 14 applies glue to the surface (the surface that becomes the outside of the paper tube 2) of one end 8 of the continuous paper 12 deformed into a cylindrical shape. Then, as shown in Figs. 7 and 9, the back surface (the surface that becomes the inside of the paper tube 2) of the other end 9 of the continuous paper 12 deformed into a cylindrical shape is overlapped with the surface (the surface that becomes the outside of the paper tube 2) of one end 8 of the continuous paper 12 in the width direction, and the overlapped parts are sandwiched and pressed by a pressing member 15 to bond them together, thereby forming a paper tube 2. Then, as shown in Figs. 7 and 10, the paper tube 2 is supplied to a triangular pyramid forming section 11 while being held in a circular cross section by a circular guide 16. In the triangular pyramid forming section 11, a first crushing section 3 and a second crushing section 4 are formed on the paper tube 2 that has passed through the circular guide 16 as follows.

[0053] As shown in Figures 6 and 11, first, with the paper tube 2 sandwiched between the pair of second crushing jigs 19, the frame driving device 27 (see Figure 5) is operated to move the moving frame 26 downstream (left side in the figure). At this time, the pair of second crushing jigs 19 attached to the moving frame 26 also move downstream together with the moving frame 26, so that the paper tube 2 sandwiched between the pair of second crushing jigs 19 is pulled out by a predetermined length from the paper tube supply section 10 toward the triangular pyramid forming section 11, and the continuous paper 12 is also unwound from the paper roll 13 shown in Figure 5. After that, as shown in Figure 12, the paper tube 2 is released from being sandwiched between the second crushing jigs 19, and the frame driving device 27 (see Figure 5) is operated in the opposite direction to move the moving frame 26 upstream (right side in the figure).

[0054] Next, as shown in Fig. 13, the first actuator 20 is operated to sandwich the paper tube 2 from both sides with a pair of first crushing jigs 18 and crush it flat, forming the first crushed section 3 (see Fig. 1). After that, as shown in Figs. 5 and 6, the paper tube 2 is released from being sandwiched by the first crushing jigs 18, and in this state, the second actuator 21 is operated to sandwich the part of the paper tube 2 upstream of the first crushed section 3 with a pair of second crushing jigs 19 from both sides and crush it flat, forming the second crushed section 4 (see Fig. 1).

[0055] 6, the operation of squeezing and crushing the paper tube 2 with the second crushing jig 19 can be performed while the paper tube 2 is still being squeezed by the first crushing jig 18, but in that case, when the paper tube 2 is squeezed and crushed by the second crushing jig 19, excessive tensile force may be applied to the part of the paper that constitutes the paper tube 2 between the first crushing jig 18 and the second crushing jig 19, causing the paper to tear. Therefore, as described above, it is preferable to perform the operation of squeezing and crushing the paper tube 2 with the second crushing jig 19 while the paper tube 2 is released from being squeezed by the first crushing jig 18. In this way, when the paper tube 2 is clamped from both sides and crushed by the second crushing jig 19, it is possible to prevent excessive tensile force from acting on the part of the paper constituting the paper tube 2 between the first crushing jig 18 and the second crushing jig 19, causing the paper to tear.

[0056] Then, as shown in Figures 6 and 11, with the paper tube 2 clamped on both sides by a pair of second crushing jigs 19, the frame drive device 27 (see Figure 5) is operated to move the moving frame 26 downstream (to the left in the figure).

[0057] By repeating the above operations, the paper cushioning material 1 shown in FIG. 1 can be manufactured.

[0058] In this paper cushioning material 1, the inner surfaces of the paper tube 2 are not heat-sealed and are not bonded at the first crushed portion 3 and the second crushed portion 4, so there is no need to use paper pre-coated with a heat sealant, and material costs are low. Also, since there is no need to heat-seal the inner surfaces of the paper tube 2 when forming the first crushed portion 3 and the second crushed portion 4, the paper cushioning material 1 can be manufactured quickly. Therefore, this paper cushioning material 1 is low cost.

[0059] Furthermore, in this paper cushioning material 1, the inner surfaces of the paper tube 2 are not heat sealed and are not bonded to each other at the first crushed section 3 and the second crushed section 4 shown in Fig. 2(a), so when disposing of the paper cushioning material 1 after use, the triangular pyramid 5 can be collapsed simply by stretching the paper cushioning material 1 in the longitudinal direction as shown in Fig. 2(b). Therefore, it is easy to reduce the size of the paper cushioning material 1 after use, and disposal is not time-consuming.

[0060] 1, the paper cushioning material 1 has a fold 7 extending in the extension direction of the first crushed portion 3, which prevents the fold 6 at both ends in the extension direction of the first crushed portion 3 from opening, thereby stabilizing the shape of the first crushed portion 3. Similarly, the paper cushioning material 1 has a fold 7 extending in the extension direction of the second crushed portion 4, which prevents the fold 7 at both ends in the extension direction of the second crushed portion 4 from opening, thereby stabilizing the shape of the second crushed portion 4. Therefore, the shape of the triangular pyramid 5 formed between the first crushed portion 3 and the second crushed portion 4 is stable.

[0061] 1, the first crushed portion 3 has both mountain and valley folds 7, so the first crushed portion 3 can be easily bent in either the mountain or valley fold direction, and similarly, the second crushed portion 4 has both mountain and valley folds 7, so the second crushed portion 4 can be easily bent in either the mountain or valley fold direction. Therefore, the paper cushioning material 1, which extends continuously in the longitudinal direction, can be bent as desired and can be easily deformed according to the shape of the gap between the product and the packaging box.

[0062] In addition, in this paper cushioning material 1, the length H (see FIG. 15) along the double fold 6 from the fold 7 located at one end in the longitudinal direction to the fold 7 located at the other end in the longitudinal direction among the two or more folds 7 provided in the first crushed portion 3 is set to 1 / 7 or more of the length W (see FIG. 2(a)) of the first crushed portion 3 in the extension direction, so that the length H of the double fold 6 at both ends in the extension direction of the first crushed portion 3 is sufficiently secured, and the shape of the first crushed portion 3 is stable. Similarly, as shown in FIG. 1, the length H along the double fold 6 from the fold 7 located at one end in the longitudinal direction to the fold 7 located at the other end in the longitudinal direction among the two or more folds 7 provided in the second crushed portion 4 is also set to 1 / 7 or more of the length W of the second crushed portion 4 in the extension direction, so that the length of the double fold 6 at both ends in the extension direction of the second crushed portion 4 is sufficiently secured, and the shape of the second crushed portion 4 is stable. Therefore, the shape of the triangular pyramid 5 formed between the first crushed portion 3 and the second crushed portion 4 can be stabilized.

[0063] In addition, as shown in Fig. 3, this paper cushioning material 1 forms a paper tube 2 by enveloping and gluing the backside of the other widthwise end 9 of the strip-shaped continuous paper 12 to the front side of one widthwise end 8, so that it is possible to reliably prevent the product from being damaged by the paper cushioning material 1 when the paper cushioning material 1 is stuffed into the gap between the product and the packaging box. That is, instead of enveloping, it is also possible to form the paper tube 2 by hand-laminated (a method of laminating and gluing the backsides of one widthwise end 8 and the other widthwise end 9 of the strip-shaped continuous paper 12) as shown in Fig. 4. In this case, however, the hand-laminated portion formed by gluing the backsides of one widthwise end 8 and the other widthwise end 9 of the continuous paper 12 to each other has a shape that protrudes from the outer periphery of the paper tube 2 when viewed from the longitudinal direction, so that the tip of the hand-laminated portion may come into contact with the product, causing damage to the product (for example, holes or tears in the shrink film wrapping the product). In contrast, as shown in Figure 3, when the paper tube 2 is formed by pasting an envelope, no protruding parts are formed from the outer circumference of the paper tube 2 when viewed from the longitudinal direction, so it is possible to reliably prevent the product from being damaged by the paper cushioning material 1.

[0064] The paper cushioning material 1 has a weight of 50 g / m 2 or more (preferably 120 g / m 2 Since the paper tube 2 is made of paper having a basis weight of 280 g / m or more, the paper has high rigidity and the shape of the triangular pyramid 5 between the first crushed portion 3 and the second crushed portion 4 shown in FIG. 1 is particularly stable. 2 or less (preferably 220 g / m 2 Since the paper tube 2 is made of paper having a basis weight of 100 g / m² (hereinafter referred to as "100 g / m²), the cost of the paper cushioning material 1 can be reduced.

[0065] In order to confirm that setting H in Fig. 1 to 1 / 7 or more of W is particularly effective in stabilizing the shape of the triangular pyramid 5, several types of paper cushioning material 1 samples with different W / H sizes were produced and tests were conducted to evaluate the ability of these paper cushioning materials 1 to retain the shape of the triangular pyramid 5. The test results are shown in Table 1. [Table 1]

[0066] As shown in Table 1, it can be seen that samples of paper cushioning material 1 in which the W / H ratio is less than 7.0 (preferably 5.8) (i.e., samples of paper cushioning material 1 in which H is set to 1 / 7 or more of W (preferably 1 / (5.8) or more)) have particularly excellent shape retention of the pyramid 5.

[0067] 16 and 17 show a second embodiment of the present invention. The second embodiment is different from the first embodiment only in the shapes of the opposing surfaces 22 of the pair of first crushing jigs 18 and the pair of second crushing jigs 19 that form the first crushed portion 3 and the second crushed portion 4, and the rest of the configuration is the same. Therefore, the parts corresponding to the first embodiment are given the same reference numerals and the description will be omitted.

[0068] 16, each of the opposing surfaces 22 has a surface shape bent at two L-shaped bends 23, 24 when viewed from the extending direction of the first crushed portion 3 (a direction perpendicular to the paper surface in FIG. 16). One of the two bends 23, 24 of each of the opposing surfaces 22 is a convex bend 23, and the other is a concave bend 24. As in the first embodiment, when a part of the longitudinal direction of the paper tube 2 is flattened, the pair of opposing surfaces 22 also form a pair of double folds 6 at both ends in the extending direction of the first crushed portion 3, and two folds 7 extending in the extending direction of the first crushed portion 3 so as to intersect with the pair of double folds 6, as shown in FIG.

[0069] 18 and 19 show a third embodiment of the present invention. The third embodiment is a modified example of the second embodiment. As shown in FIG. 18, a convex rib 28 protruding toward the other opposing surface 22 is formed at the convex bent portion 23 of one opposing surface 22 of the pair of opposing surfaces 22, and a concave rib 29 corresponding to the convex rib 28 is formed at the concave bent portion 24 of the other opposing surface 22. In this way, as shown in FIG. 19, when the paper tube 2 is sandwiched between the convex bent portion 23 of one opposing surface 22 of the opposing surfaces 22 and the concave bent portion 24 of the other opposing surface 22 to form the fold 7, it is possible to form a stronger fold 7.

[0070] 20 and 21 show a fourth embodiment of the present invention. The fourth embodiment is a modified example of the second embodiment. As shown in FIG. 20, each of the opposing surfaces 22 has a surface shape bent at four L-shaped bent portions 23, 24 when viewed from the extending direction of the first crushed portion 3 (the direction perpendicular to the paper surface in FIG. 20). Two of the four bent portions 23, 24 of each of the opposing surfaces 22 are convex bent portions, and the remaining two bent portions 24 are concave bent portions. When a part of the longitudinal direction of the paper tube 2 is flattened, the pair of opposing surfaces 22 form a pair of two-fold creases 6 at both ends in the extending direction of the first crushed portion 3 and four folds 7 extending in the extending direction of the first crushed portion 3 so as to intersect with the pair of two-fold creases 6, as shown in FIG. 21. The four folds 7 formed in parallel at intervals in the longitudinal direction are arranged such that mountain folds and valley folds are alternately arranged from one side to the other in the longitudinal direction.

[0071] As shown in Figure 21, of the four folds 7 provided in the first crushing section 3, the length along the double fold 6 from the fold 7 located at one end in the longitudinal direction to the fold 7 located at the other end in the longitudinal direction (the length of the fold line formed by the double fold 6) is set to be 1 / 7 or more of the length W of the first crushing section 3 in the extension direction (see Figure 2(a)).

[0072] A fifth embodiment of the present invention is shown in Figures 22 and 23. The fifth embodiment is a modified example of the first embodiment. As shown in Figure 22, one of the pair of opposing surfaces 22 has a surface shape bent at five V-shaped bent portions 23, 24 when viewed from the extending direction of the first crushed portion 3 (a direction perpendicular to the paper surface in Figure 22). Of the five bent portions 23, 24 on one of the opposing surfaces 22, two bent portions 23 are convex bent portions, and the remaining three bent portions 24 are concave bent portions. In addition, of the five bending portions 23, 24 on the other opposing surface 22, the two bending portions corresponding to the convex bending portions 23 on one opposing surface 22 are concave bending portions 24, and the three bending portions corresponding to the concave bending portions 24 on the other opposing surface 22 are convex bending portions 23.

[0073] 23, when a portion of the paper tube 2 in the longitudinal direction is pressed flat, the pair of opposing surfaces 22 form a pair of double folds 6 at both ends in the extending direction of the first crushed portion 3, and five folds 7 extending in the extending direction of the first crushed portion 3 so as to intersect with the pair of double folds 6. The five folds 7 formed in parallel with intervals in the longitudinal direction are arranged so that mountain folds and valley folds are alternately arranged from one side in the longitudinal direction to the other side.

[0074] Figures 24 and 25 show another example of a manufacturing device for the paper cushioning material 1. The manufacturing device shown in Figures 24 and 25 differs from the manufacturing device shown in Figures 5 and 6 only in the configuration of the paper tube supply section 10, and the other configurations are the same. Therefore, parts corresponding to those in the manufacturing device shown in Figures 5 and 6 are given the same reference numerals and descriptions thereof will be omitted.

[0075] As shown in Fig. 24, the paper tube supplying section 10 has a roll 31 on which a continuous, uninterrupted, belt-shaped paper tube original roll 30 is wound, and an opening guide 32 that changes the cross section of the paper tube original roll 30 unwound from the roll 31 to a non-flat tubular cross section. The paper tube original roll 30 is a long, belt-shaped body formed by flattening the paper tube 2 that extends continuously in the longitudinal direction over its entire length so that both ends in the width direction are folded in half. As shown in Fig. 3, the paper tube original roll 30 is formed by enveloping the front surface of one end 8 in the width direction of the continuous paper 12 with the back surface of the other end 9 in the width direction.

[0076] As shown in Figure 25, the opening guide 32 has a guide hole 33 with an inner width narrower than the width of the paper tube original roll 30. The paper tube original roll 30 is introduced into the guide hole 33 and pressed against both widthwise ends of the paper tube original roll 30 with the inner surface of the guide hole 33, thereby opening the double folds at both widthwise ends of the paper tube original roll 30 and deforming the paper tube original roll 30 from a flat cross-section to a non-flat cylindrical cross-section.

[0077] Because the paper tube supply unit 10 of this manufacturing device for paper cushioning material 1 is compact and space-saving, it is suitable for use at a site where the paper cushioning material 1 is filled into the gap between a packaging box and a product. That is, as shown in Fig. 5, when the paper tube 2 is formed by unwinding the continuous paper 12 from the paper roll 13, deforming the continuous paper 12 into a cylindrical shape, and bonding together one widthwise end 8 and the other widthwise end 9 of the continuous paper 12, a guide member for deforming the continuous paper 12 into a cylindrical shape, a gluing device 14 for applying glue to one widthwise end 8 of the continuous paper 12, a pressing member 15 for pressing down one widthwise end 8 and the other widthwise end 9 of the continuous paper 12, etc. are required, which makes it easy for the paper tube supply unit 10 to become large. In contrast, as shown in Fig. 24, when paper tube 2 is formed by unwinding paper tube original roll 30 from original roll 31, opening paper tube original roll 30, and deforming the paper tube 2 from a flat cross section to a non-flat cylindrical cross section with guide 32, there is no need for a guide member for deforming web 12 into a cylindrical shape, a gluing device 14 for applying glue to one widthwise end 8 of web 12, or a pressing member 15 for pressing down one widthwise end 8 and the other widthwise end 9 of web 12, etc., as shown in Fig. 5, making paper tube supply unit 10 compact and space-saving. Therefore, the manufacturing device for paper cushioning material 1 is suitable for use at the site where paper cushioning material 1 is stuffed into the gap between a packaging box and a product.

[0078] As shown in Figure 1, paper cushioning material 1, in which a triangular pyramid 5 is formed between a first crushed portion 3 whose inner faces are not bonded to each other and a second crushed portion 4 whose inner faces are not bonded to each other, was stuffed into the gap between the product and the packaging box, and a vibration test was conducted to confirm that the shape of the triangular pyramid 5 would not collapse when subjected to vibrations or shocks during delivery. The vibration test method will be explained.

[0079] As shown in Figs. 26 and 27, a product case (weight 2 kg) was placed in a cardboard box to resemble a product. Between the inner surface of the cardboard box and the outer surface of the product case, there was a clearance of 60 mm in each of the front-rear, left-right, and up-down directions. Next, paper cushioning material 1 was stuffed between the inner surface of the cardboard box and the outer surface of the product case, and the cardboard box was sealed. The paper cushioning material 1 used here was manufactured from a paper tube original roll 30 as shown in Fig. 24, in which the width of the paper tube original roll 30 was 55 mm, the length H along the double fold 6 from one fold 7 to the other fold 7 shown in Fig. 15 was 18 mm, and the paper constituting the paper tube original roll 30 was RKA170.

[0080] The cardboard box was then placed in a vibration tester and vibrations were applied to the cardboard box for a total of 90 minutes, 30 minutes in the X-axis direction, 30 minutes in the Y-axis direction, and 30 minutes in the Z-axis direction. The vibration test method used was in accordance with JIS Z0232:2020 "Packaged cargo - Vibration test method." The cardboard box was then opened, and the condition of the paper cushioning material 1 stuffed in the clearance between the inner surface of the cardboard box and the outer surface of the product case was checked.

[0081] As a result of the above test, it was confirmed that the triangular pyramid 5 of the paper cushioning material 1 did not lose its shape, as shown in Figure 28. In addition, even after the vibration test, the product case did not shift position inside the cardboard box, and it was confirmed that the paper cushioning material 1 maintained the fixation of the product case.

[0082] In the above embodiment, as shown in FIG. 2(a), an example was given in which the crushing direction of the first crushing portion 3 and the crushing direction of the second crushing portion 4 are perpendicular when viewed from the longitudinal direction. However, the crushing direction of the first crushing portion 3 and the crushing direction of the second crushing portion 4 may be different directions when viewed from the longitudinal direction. For example, the crushing direction of the first crushing portion 3 and the crushing direction of the second crushing portion 4 may form an angle of 60° when viewed from the longitudinal direction. [Explanation of symbols]

[0083] 2 paper tube 3 First crushing section 4 Second crushing section 5 triangular pyramid 6 Fold in half 7. Folding 8 One end in the width direction 9 Other end in width direction 10 Paper tube supply section 12 Continuous paper 18 First crushing jig 19 Second crushing jig 22 Opposite Surface H,W length

Claims

1. A first crushed portion (3) and a second crushed portion (4) are alternately provided at intervals in the longitudinal direction on a paper tube (2) extending continuously in the longitudinal direction, The first crushed portion (3) is a portion in the longitudinal direction of the paper tube (2) that is crushed flat, The second crushed portion (4) is a portion in the longitudinal direction of the paper tube (2) that is crushed flat from a direction different from the crushing direction of the first crushed portion (3) when viewed from the longitudinal direction, The portion of the paper tube (2) between the first crushed portion (3) and the second crushed portion (4) is formed into a triangular pyramid (5) by providing the first crushed portion (3) and the second crushed portion (4), The inner surfaces of the paper tube (2) in the first crushed portion (3) are not bonded to each other, The paper cushioning material is such that the inner surfaces of the paper tube (2) at the second crushed portion (4) are also not bonded to each other.

2. The first crushed portion (3) is provided with a pair of two-fold creases (6) located at both ends in the extension direction of the first crushed portion (3), and a fold (7) extending in the extension direction of the first crushed portion (3) so as to intersect with the pair of two-fold creases (6), The paper cushioning material according to claim 1, wherein the second crushed portion (4) also has a pair of two-fold creases (6) located at both ends in the extension direction of the second crushed portion (4), and a fold (7) extending in the extension direction of the second crushed portion (4) so ​​as to intersect with the pair of two-fold creases (6).

3. The first crushed portion (3) has two or more folds (7) including a mountain fold and a valley fold, spaced apart in the longitudinal direction, The paper cushioning material according to claim 2, wherein the second crushed portion (4) has two or more folds (7) including a mountain fold and a valley fold, spaced apart in the longitudinal direction.

4. Among the two or more folds (7) provided in the first crushed portion (3), a length (H) along the double fold (6) from the fold (7) located at one end in the longitudinal direction to the fold (7) located at the other end in the longitudinal direction is set to be 1 / 7 or more of a length (W) in the extension direction of the first crushed portion (3), The paper cushioning material according to claim 3, wherein the length (H) along the two-fold crease (6) from the crease (7) located at one end in the longitudinal direction to the crease (7) located at the other end in the longitudinal direction, among the two or more creases (7) provided in the second crushed portion (4), is also set to be at least 1 / 7 of the length (W) in the extension direction of the second crushed portion (4).

5. The paper cushioning material according to any one of claims 1 to 4, wherein the paper tube (2) is formed by envelope pasting in which the back surface of one widthwise end (8) of a strip-shaped continuous paper (12) is overlapped and glued to the back surface of the other widthwise end (9).

6. The paper cylinder (2) has a weight of 50 to 280 g / m ２ 5. The paper cushioning material according to claim 1, which is formed from paper having a basis weight of 100% or more.

7. A paper tube (2) extending continuously in the longitudinal direction is supplied from a paper tube supply section (10); A pair of first crushing jigs (18) are arranged opposite each other with the paper tube (2) therebetween, and a portion of the paper tube (2) in the longitudinal direction is clamped and flattened to form a first crushed portion (3) in the paper tube (2) whose inner surfaces are not bonded to each other; A pair of second crushing jigs (19) are arranged opposite each other with the paper tube (2) therebetween, and clamp a portion of the paper tube (2) spaced from the first crushed portion (3) in the longitudinal direction from a direction different from the crushing direction of the pair of first crushing jigs (18) as viewed from the longitudinal direction, thereby forming a second crushed portion (4) in the paper tube (2) whose inner surfaces are not bonded to each other; A method for manufacturing paper cushioning material, in which the first crushed portion (3) and the second crushed portion (4) are alternately formed at intervals in the longitudinal direction on the paper tube (2) supplied from the paper tube supply unit (10), thereby forming the portion of the paper tube (2) between the first crushed portion (3) and the second crushed portion (4) into a triangular pyramid (5).

8. When the pair of first crushing jigs (18) flatten a portion of the longitudinal direction of the paper tube (2) to form the first crushed portion (3), the pair of first crushing jigs (18) sandwich and crush the paper tube (2) between a pair of opposing surfaces (22) having a curved surface shape when viewed from the extension direction of the first crushed portion (3), thereby forming a pair of two-fold creases (6) at both ends in the extension direction of the first crushed portion (3) and a fold (7) extending in the extension direction of the first crushed portion (3) so as to intersect with the pair of two-fold creases (6), The method for manufacturing paper cushioning material described in claim 7, wherein when the pair of second crushing jigs (19) flatten a portion of the paper tube (2) spaced from the first crushed portion (3) in the longitudinal direction to form the second crushed portion (4), the pair of second crushing jigs (19) clamp and crush the portion between a pair of opposing surfaces (22) having a curved surface shape when viewed from the extension direction of the second crushed portion (4), thereby forming a pair of double folds (6) at both ends in the extension direction of the second crushed portion (4) and a fold (7) extending in the extension direction of the second crushed portion (4) so ​​as to intersect with the pair of double folds (6).

9. a paper tube supply unit (10) that supplies a paper tube (2) that extends continuously in the longitudinal direction; a pair of first crushing jigs (18) that are disposed opposite each other with the paper tube (2) therebetween and that pinch a portion of the paper tube (2) in the longitudinal direction and crush it flat to form a first crushed portion (3) in the paper tube (2) whose inner surfaces are not bonded to each other; a pair of second crushing jigs (19) that are disposed opposite each other with the paper tube (2) therebetween and that clamp and flatten a portion of the paper tube (2) spaced apart from the first crushed portion (3) in the longitudinal direction from a direction different from the crushing direction of the pair of first crushing jigs (18) as viewed from the longitudinal direction, thereby forming a second crushed portion (4) in the paper tube (2) whose inner surfaces are not bonded to each other; The paper tube (2) supplied from the paper tube supply unit (10) is alternately formed with the first crushed portion (3) and the second crushed portion (4) spaced apart in the longitudinal direction, thereby forming the portion of the paper tube (2) between the first crushed portion (3) and the second crushed portion (4) into a triangular pyramid (5).

10. The pair of first crushing jigs (18) have a pair of opposing surfaces (22) that sandwich and crush the paper tube (2) therebetween, and the pair of opposing surfaces (22) have a surface shape that is bent when viewed from the extension direction of the first crushed portion (3) so as to form a pair of two-fold creases (6) at both ends in the extension direction of the first crushed portion (3) and a fold crease (7) that extends in the extension direction of the first crushed portion (3) so as to intersect with the pair of two-fold creases (6) when a part of the longitudinal direction of the paper tube (2) is crushed flat to form the first crushed portion (3); The pair of second crushing jigs (19) have a pair of opposing surfaces (22) that clamp and crush the paper tube (2) between them, and the pair of opposing surfaces (22) have a curved surface shape when viewed from the extension direction of the second crushed portion (4) so ​​as to form a pair of two-fold creases (6) at both ends in the extension direction of the second crushed portion (4) and a fold (7) extending in the extension direction of the second crushed portion (4) so ​​as to intersect with the pair of two-fold creases (6). This is the paper cushioning material manufacturing device described in claim 9.

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