Manufacturing method of paper cushioning material, and web roll

Abstract

To provide a manufacturing method of a paper cushioning material which requires only a small space for manufacturing the paper cushioning material.SOLUTION: A manufacturing method of a paper cushioning material comprises the steps of: using a web roll 6 formed by winding a belt-like paper cylinder web roll 10 in a configuration where a paper cylinder 2 continuously extending in a longitudinal direction is flatly crushed over a whole length to bring both ends in a width direction into a two-folded form; delivering the paper cylinder web roll 10 from the web roll 6; introducing the paper cylinder web roll 10 into an opening guide 11 having an inner width φ narrower than a width W of the paper cylinder web roll 10, thereby, forming the paper cylinder 2 continuously extending in the longitudinal direction by opening the two-folded form of both ends in the width direction of a paper cylinder web roll 10 from a flat state; and forming first to-be-crushed portions 3 and second to-be-crushed portions 4 alternately in the paper cylinder 2 at intervals in the longitudinal direction; thereby, forming each portion between the first to-be-crushed portion 3 and the second to-be-crushed portion 4 of the paper cylinder 2 into a triangular pyramid 5 to obtain a paper cushioning material 1.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing a paper cushioning material, and a raw material roll used in the method for manufacturing the paper cushioning material. [Background technology]

[0002] When shipping products sold through mail order sales, etc., the gap between the product and the packaging box is often filled with cushioning material 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, those described in Patent Documents 3 and 4 are known as paper cushioning materials. The paper cushioning materials in Patent Documents 3 and 4 are made by feeding a strip of kraft paper that extends continuously in the longitudinal direction from a paper feeder, and crumpling the strip of kraft paper by sandwiching it between a pair of rotating bodies located on both sides in the width direction and passing it through. However, the paper cushioning materials 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 prototype paper cushioning material was made by arranging vertical and horizontal seals alternately at intervals along the length of a paper tube that extended continuously in the longitudinal direction, with the portion between the vertical and horizontal seals formed into a triangular pyramid.

[0008] In the above prototype, the paper cushioning material was manufactured as follows, using a paper roll on which a strip-shaped continuous paper extending continuously in the longitudinal direction was wound.

[0009] That is, a strip-shaped continuous paper that extends continuously in the longitudinal direction is paid out from a paper roll, the continuous paper is curved in the width direction and gradually deformed into a cylindrical shape, one end of the deformed continuous paper in the width direction and the other end of the width direction are overlapped and heat-sealed to form a paper tube that extends continuously in the longitudinal direction, and a part of the longitudinal direction of the paper tube is heat-sealed alternately at intervals in the longitudinal direction with a vertical seal bar and a horizontal seal bar to form a vertical seal section and a horizontal seal section, and the part between the vertical seal section and the horizontal seal section is formed into a triangular pyramid. The crushing direction of the vertical seal section and the crushing direction of the horizontal seal section are perpendicular to each other when viewed from the longitudinal direction of the paper tube. A heat-seal paper that has been coated with a heat-sealing agent in advance is used as the continuous paper that forms the paper tube.

[0010] Here, the inventors of the present application noticed a problem that when manufacturing paper cushioning material in the manner described above, it is difficult to secure space for manufacturing the paper cushioning material at the site where the paper cushioning material is stuffed into the gap between the packaging box and the product.

[0011] That is, when, as in the above prototype, a strip-shaped continuous paper is unwound from a paper roll and continuously extends in the longitudinal direction, the continuous paper is curved in the width direction to deform into a cylindrical shape, and one end and the other end of the deformed cylindrical continuous paper are overlapped and heat-sealed to form a paper tube that extends continuously in the longitudinal direction, a guide member is required to curve the strip-shaped continuous paper unwound from the paper roll and deform into a cylindrical shape in the width direction, and a heat-sealing device is required to heat-seal one end and the other end of the deformed cylindrical continuous paper to form a paper tube, and a large space is required to manufacture the paper cushioning material. Therefore, the problem was noticed that it is difficult to secure space to manufacture the paper cushioning material at the site where the paper cushioning material is filled into the gap between the packaging box and the product.

[0012] In addition, as in Patent Documents 1 and 2 above, 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. In contrast, 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 heat seal paper pre-coated with a heat seal agent in order to enable heat sealing of the vertical and horizontal seals, which results in the problem of high material costs.

[0013] Furthermore, with air cushioning made of plastic film as in Patent Documents 1 and 2 above, when it is time to dispose of the air cushioning after it has been packed between a product and a packaging box and delivered, 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 paper cushioning as in the prototype paper cushioning 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 it is time to dispose of the paper cushioning after it has been packed between a product and a packaging box and delivered, it is not easy to make the triangular pyramid-shaped bag part smaller because paper is more rigid than plastic film, and so there is a problem that disposal of the paper cushioning is time-consuming.

[0014] 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.

[0015] The problem to be solved by this invention is to provide a method for manufacturing a paper cushioning material that requires a small space for manufacturing the paper cushioning material. [Means for solving the problem]

[0016] The inventors of the present application came up with the idea that by pre-manufacturing a strip-shaped paper tube original in which a paper tube extending continuously in the longitudinal direction is flattened over its entire length so that both widthwise ends are folded in half, and then using a roll of the original paper formed by winding up this paper tube original, there is no need for guide members for curving the strip-shaped continuous paper extending continuously in the longitudinal direction unwound from the paper roll in the width direction to deform it into a cylindrical shape, or devices for bonding one widthwise end and the other widthwise end of the deformed cylindrical continuous paper to form a paper tube extending continuously in the longitudinal direction, thereby making it easier to secure space for manufacturing paper cushioning material at the site where the paper cushioning material is stuffed into the gap between the packaging box and the product.

[0017] Based on this idea, in order to solve the above problems, the present invention provides a method for manufacturing a paper cushioning material having the following configuration. [Configuration 1] A roll of raw paper is used, which is formed by winding up a belt-shaped paper tube raw paper, the belt-shaped paper tube being configured by flattening the entire length of the paper tube that extends continuously in the longitudinal direction so that both ends in the width direction are folded in half, The paper tube roll is unwound from the roll and introduced into an opening guide having an inner width narrower than the width of the paper tube roll, so that the paper tube roll is folded in half at both ends in the width direction from a flat state to form a paper tube that extends continuously in the longitudinal direction; A method for manufacturing paper cushioning material in which a first crushed section, which is obtained by crushing a portion of the length of the paper tube flat, and a second crushed section, which is obtained by crushing a portion of the length of the paper tube flat from a direction different from the crushing direction of the first crushed section when viewed from the longitudinal direction, are alternately formed at intervals along the longitudinal direction of the paper tube, thereby forming the portion of the paper tube between the first crushed section and the second crushed section into a triangular pyramid to obtain the paper cushioning material.

[0018] When this configuration is adopted, a raw roll is used that is formed by winding up a strip-shaped paper tube raw roll that is configured by flattening the entire length of a paper tube that extends continuously in the longitudinal direction so that both widthwise ends are folded in half, so there is no need for a guide member for curving the strip-shaped continuous paper that extends continuously in the longitudinal direction in the width direction to deform it into a cylindrical shape, or a device for bonding one widthwise end and the other widthwise end of the deformed cylindrical continuous paper to form a paper tube, etc. Therefore, the space required for manufacturing the paper cushioning material is small, and it is easy to secure space for manufacturing the paper cushioning material at the site where the paper cushioning material is filled into the gap between the packaging box and the product.

[0019] [Configuration 2] When forming the first crushed portion, the first crushed portion is formed so that the inner surfaces of the paper tube at the first crushed portion are not bonded to each other; A manufacturing method for paper cushioning material according to configuration 1, in which the second crushed portion is also formed so that the inner surfaces of the paper tube at the second crushed portion are not bonded to each other.

[0020] By adopting this configuration, there is no need to use heat seal paper that has been pre-coated with a heat sealant as the paper that forms the paper tube roll. Also, since there is no need to heat seal the inner surfaces of the paper tube when forming the first and second crushed sections, the paper cushioning material can be produced quickly. This makes it possible to reduce the manufacturing costs of the paper cushioning material.

[0021] In addition, because the inner surfaces of the paper tube are not heat sealed and are not bonded in the first and second crushing sections, 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. This makes it easy to reduce the size of the paper cushioning material after use, and disposal is not time-consuming.

[0022] [Configuration 3] The method for producing a paper cushioning material according to configuration 2, wherein the paper tube raw material is formed of non-heat sealable paper that is not coated with a heat sealant.

[0023] By adopting this configuration, it is possible to keep the material cost of the paper tube roll low.

[0024] [Configuration 4] A method for manufacturing paper cushioning material described in any one of configurations 1 to 3, wherein the paper tube original roll is formed by envelope pasting, in which the front surface of one end of the continuous paper in the width direction is overlapped with the back surface of the other end of the continuous paper in the width direction and glued together.

[0025] By adopting this configuration, it is possible to reliably prevent the product from being damaged by the paper cushioning material when it is stuffed into the gap between the product and the packaging box. In other words, it is possible to form a paper tube original roll by seam-pasting (a method in which the back surfaces of one end of the continuous paper in the width direction and the other end of the continuous paper in the width direction are overlapped and glued together) instead of by envelope pasting, but in this case, the paper cushioning material formed from the paper tube original roll has a seam that protrudes from the outer periphery of the paper tube when viewed from the longitudinal direction, and there is a risk that the product will be damaged by the tip of the seam that comes 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 original roll is formed by envelope pasting, the paper cushioning material formed from the paper tube original roll does not have a protruding part 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 material.

[0026] [Configuration 5] A method for manufacturing paper cushioning material as described in configuration 4, in which an overlapping portion, in which the surface of one widthwise end of the continuous paper is overlapped with the back surface of the other widthwise end of the continuous paper, is positioned at one widthwise end of the paper tube roll.

[0027] When this configuration is adopted, the overlapping portion where the paper is doubled by overlapping the front surface of one widthwise end of the continuous paper with the back surface of the other widthwise end (i.e., the portion of the paper tube roll that is relatively rigid and relatively resistant to deformation) is located at one widthwise end of the paper tube roll, ensuring ease of deformation of the widthwise center portion of the paper tube roll. Therefore, it becomes possible to stably deform the paper tube roll from a flat state to a cylindrical shape in the opening guide.

[0028] [Configuration 6] A method for manufacturing paper cushioning material as described in configuration 5, wherein the overlapping portion is provided at the position of a fold at one end of the width direction of the paper tube roll so that the overlapping portion is folded in half.

[0029] When this configuration is adopted, one end of the paper tube roll in the width direction is folded in half so that the overlapping portion (i.e., the portion of the paper tube roll that is relatively rigid and relatively resistant to deformation) is folded in half, and the restoring force of the paper that constitutes the overlapping portion generates a force that tries to open the folded portion at one end of the paper tube roll in the width direction. Therefore, in the opening guide, the paper that constitutes the paper tube roll is less likely to deform in such a way that it is recessed toward the inner diameter, and the paper tube roll can be stably deformed into a cylindrical shape.

[0030] [Configuration 7] The paper tube raw material is 50 to 280 g / m 2 7. The method for producing a paper cushioning material according to any one of claims 1 to 6, wherein the paper cushioning material is made of paper having a basis weight of 100 g / m2 or more.

[0031] With this configuration, 50 g / m 2 Since the paper roll is made of paper having a basis weight of 280 g / m or more, the paper that forms the paper roll is not too soft, and when both ends of the paper roll in the width direction are opened and pressed with a guide, the folded ends of the paper roll in the width direction can be stably opened. 2 Since the paper tube roll is made of paper having the following basis weight, the material costs of the paper cushioning material can be reduced.

[0032] [Configuration 8] The first crushed portion is formed by clamping a part of the longitudinal direction of the paper tube with a pair of first crushing jigs arranged opposite each other with the paper tube therebetween and crushing the paper tube flat, The second crushed portion is formed by clamping a part of the longitudinal direction of the paper tube with a pair of second crushing jigs arranged opposite each other with the paper tube therebetween from a direction different from the crushing direction by the pair of first crushing jigs as viewed from the longitudinal direction, and crushing the part flat. The pair of first crushing jigs and the pair of second crushing jigs are arranged in the following order from the opening guide toward the downstream side: the pair of second crushing jigs, and the pair of first crushing jigs; A method for manufacturing paper cushioning material described in any one of configurations 1 to 7, wherein the direction in which the paper tube is crushed by the pair of second crushing tools located immediately behind the opening guide is set to the same direction as the width direction of the paper tube original roll at a position immediately before the opening guide.

[0033] When this configuration is adopted, the extension direction of the second crushing portion formed by a pair of second crushing tools located immediately behind the opening guide is perpendicular to the width direction of the paper tube original located immediately before the opening guide, making it possible to stably deform the paper tube original from a flat state to a cylindrical shape at the opening guide position.

[0034] [Configuration 9] A method for manufacturing paper cushioning material according to any one of configurations 1 to 8, in which a roll presser is provided immediately before the opening guide to provide the paper tube roll with resistance to downstream movement.

[0035] When this configuration is adopted, tension is applied to the portion of the paper tube roll that contacts the opening guide, making it possible to stably deform the paper tube roll from a flat state to a cylindrical shape in the opening guide.

[0036] The present invention also provides a paper tube raw material used in the above-mentioned method for producing paper cushioning material, the raw material having the following configuration. [Configuration 10] The paper roll is formed by winding up a strip-shaped paper tube original, which is a paper tube that extends continuously in the longitudinal direction and is flattened over its entire length so that both ends in the width direction are folded in half.

[0037] [Configuration 11] 11. The paper tube raw material roll according to configuration 10, wherein the paper tube raw material roll is formed of non-heat sealable paper that is not coated with a heat sealant.

[0038] [Configuration 12] 12. The paper tube original roll according to configuration 10 or 11, wherein the paper tube original roll is formed by enveloping the continuous paper by overlapping and adhering the front surface of one end of the continuous paper in the width direction to the back surface of the other end of the continuous paper in the width direction.

[0039] [Configuration 13] A raw paper roll as described in configuration 12, in which an overlapping portion, in which the paper is doubled by overlapping the front surface of one widthwise end of the continuous paper with the back surface of the other widthwise end, is positioned at one widthwise end of the paper tube raw paper.

[0040] [Configuration 14] The paper roll according to configuration 13, wherein the overlapping portion is provided at a fold line at one end of the paper tube paper roll in the width direction so that the overlapping portion is folded in half.

[0041] [Configuration 15] The paper tube raw material is 50 to 280 g / m 2 15. The raw material roll according to any one of claims 10 to 14, which is formed of paper having a basis weight of Effect of the Invention

[0042] The method for manufacturing paper cushioning material of this invention uses a raw roll formed by winding up a strip-shaped paper tube raw roll that is configured by flattening the entire length of a paper tube that extends continuously in the longitudinal direction so that both widthwise ends are folded in half, so there is no need for a guide member for curving the strip-shaped continuous paper that extends continuously in the longitudinal direction in the width direction to deform it into a cylindrical shape, or a device for bonding one widthwise end and the other widthwise end of the deformed cylindrical continuous paper to form a paper tube, etc. Therefore, the space required for manufacturing the paper cushioning material is small, and it is easy to secure space for manufacturing the paper cushioning material at the site where the paper cushioning material is filled into the gap between the packaging box and the product. [Brief description of the drawings]

[0043] [Figure 1] FIG. 1 is a perspective view showing a paper cushioning material manufactured by a method for manufacturing a paper cushioning material according to an embodiment of the present invention; [Diagram 2]FIG. 2 is a front view of a manufacturing apparatus for manufacturing the paper cushioning material shown in FIG. [Diagram 3] Plan view of Figure 2 [Figure 4] FIG. 3 is a perspective view of the raw roll shown in FIG. [Diagram 5] Cross-sectional view of the paper tube roll being unwound from the roll shown in Figure 4. [Figure 6] FIG. 6 is a diagram showing a modified example of the paper tube original shown in FIG. 5. [Figure 7] An enlarged view of the vicinity of the paper tube forming 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. 4 is a plan view showing a state in which the moving frame shown in FIG. 3 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. 3 is a front view showing another example of the paper cushioning material manufacturing apparatus shown in FIG. [Figure 15] Plan view of Fig. 14 [Figure 16] FIG. 10 is a diagram showing another example of the opening guide shown in FIG. 9 . [Figure 17] FIG. 10 is a diagram showing still another example of the opening guide shown in FIG. 9 . [Figure 18] FIG. 10 is a diagram showing still another example of the opening guide shown in FIG. 9 . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0044] Fig. 1 shows a paper cushioning material 1 manufactured by a manufacturing method according to an 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.

[0045] 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 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. The inner surfaces of the paper tube 2 in the first crushed portion 3 are not bonded to each other with an adhesive such as a heat sealant, and are in a non-bonded state.

[0046] Similarly, 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 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 crushing direction of the second crushed portion 4 is 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 to each other with an adhesive such as a heat sealant and are in a non-bonded state.

[0047] 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 is the same as the length of the second crushed portion 4 in the extension direction. 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 of the first crushed portion 3 in the extension direction.

[0048] A manufacturing device for paper cushioning material is shown in Figure 2. This manufacturing device has a paper tube forming unit 7 that uses a raw material roll 6 to form a paper tube 2 that extends continuously in the longitudinal direction, and a triangular pyramid forming unit 8 that forms a portion of the paper tube 2 between the first crushed portion 3 and the second crushed portion 4 into a triangular pyramid 5 by alternately forming first crushed portions 3 and second crushed portions 4 at intervals in the longitudinal direction on the paper tube 2 supplied from the paper tube forming unit 7.

[0049] The paper tube forming section 7 has a support shaft 9 that rotatably supports the original roll 6, an opening guide 11 that deforms the paper tube original roll 10 unwound from the original roll 6 from a flat state into a cylindrical shape, and a number of guide rollers 12, 13 that guide the paper tube original roll 10 from the original roll 6 to the opening guide 11.

[0050] As shown in FIG. 4, the raw roll 6 is formed by winding up a belt-shaped paper tube raw roll 10, which is a paper tube 2 extending continuously in the longitudinal direction, flattened over its entire length so that both ends in the width direction are folded in half. The paper that constitutes the paper tube raw roll 10 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.). The paper that constitutes the paper tube raw roll 10 has a weight of 50 to 280 g / m 2 (Preferably 120 to 220 g / m 2 ) basis weight is used.

[0051] As shown in FIG. 5, the paper tube original roll 10 is formed by overlapping and gluing the backside of the other widthwise end 15 to the front side of one widthwise end 14 of the strip-shaped continuous paper that extends continuously in the longitudinal direction (the direction perpendicular to the paper surface in the drawing). An overlapping portion 16, where the paper is doubled by overlapping the backside of the other widthwise end 15 to the front side of one widthwise end 14 of the continuous paper, is disposed at one widthwise end of the paper tube original roll 10. In the overlapping portion 16, a two-fold crease 17 is formed at one widthwise end of the paper tube original roll 10 so that both the one widthwise end 14 and the other widthwise end 15 of the continuous paper are folded in half. That is, the overlapping portion 16 is provided at the position of the two-fold crease 17 at one widthwise end of the paper tube original roll 10 so that the overlapping portion 16 is folded in half. It is possible to bond the entire area of ​​the overlapping portion of one width direction end 14 and the other width direction end 15 of the continuous paper, but here, only the part of the overlapping portion of one width direction end 14 and the other width direction end 15 of the continuous paper on the side where the edge of the other width direction end 15 is relative to the double fold 17 (the lower side in the figure) is bonded, and the part on the side where the edge of one width direction end 14 is relative to the double fold 17 (the upper side in the figure) is not bonded (see the dashed line in Figure 9). This makes it possible to reduce the amount of adhesive used to bond one width direction end 14 and the other width direction end 15 of the continuous paper, thereby reducing costs.

[0052] As shown in Fig. 2, a web presser 18 is provided immediately before the opening guide 11. The web presser 18 contacts the paper tube web 10 immediately before the opening guide 11 so as to provide resistance to the paper tube web 10 moving downstream. By providing this web presser 18, tension is applied to the portion of the paper tube web 10 that contacts the opening guide 11, so that the paper tube web 10 is stably deformed from a flat state to a cylindrical shape at the opening guide 11. Although a roller-shaped member is shown as the web presser 18 in the figure, the web presser 18 may be configured as a non-rotating member that is in sliding contact with the paper tube web 10.

[0053] As shown in Fig. 7, the opening guide 11 has a guide hole 19 with an inner width φ narrower than the width W of the paper tube original roll 10. As shown in Fig. 9, the opening guide 11 introduces the paper tube original roll 10 into the guide hole 19 and presses both ends of the paper tube original roll 10 in the width direction with the inner surface of the guide hole 19, thereby opening the double folds at both ends of the paper tube original roll 10 in the width direction and deforming the paper tube original roll 10 from a flat state to a cylindrical shape.

[0054] The inner width φ of the guide hole 19 shown in Fig. 7 is set to 0.64 times or more (preferably 0.65 times or more) and 0.82 times or less (preferably 0.80 times or less) the width W of the paper tube original roll 10. By setting the inner width φ of the guide hole 19 to 0.64 times or more (preferably 0.65 times or more) the width W of the paper tube original roll 10, it is possible to prevent the paper tube 2 and the guide hole 19 from having a dimensional relationship of tight fit. By setting the inner width φ of the guide hole 19 to 0.82 times or less (preferably 0.80 times or less) the width W of the paper tube original roll 10, it is possible to stably deform the paper tube original roll 10 from a flat state to a cylindrical state in the opening guide 11.

[0055] As shown in FIG. 7, the distance X from the position of the guide roller 13 located closest to the opening guide 11 to the entrance of the opening guide 11 is set to 1.1 times or more the width W of the paper tube original roll 10. In this way, the opening guide 11 can stably deform the paper tube original roll 10 from a flat state to a cylindrical shape. For example, when the width W of the paper tube original roll 10 is 35 mm, the distance X is set to 40 mm or more, when the width W of the paper tube original roll 10 is 55 mm, the distance X is set to 70 mm or more, and when the width W of the paper tube original roll 10 is 75 mm, the distance X is set to 90 mm or more, so that the opening guide 11 can stably deform the paper tube original roll 10 from a flat state to a cylindrical shape. The length Y of the opening guide 11 is set to 15 mm or more.

[0056] 7 and 10, an additional guide 20 is provided at the exit of the spread guide 11. The additional guide 20 has an inner width smaller than the inner width φ of the guide hole 19 at the end on the exit side of the spread guide 11, and by pressing both ends in the width direction of the cylindrical paper tube 2 formed by the spread guide 11, it deforms the cross-sectional shape of the paper tube 2 into an elongated cylindrical shape in a direction perpendicular to the width direction (the up-down direction in FIG. 10).

[0057] As shown in FIG. 2 and FIG. 3, the triangular pyramid forming section 8 has a pair of first crushing jigs 21 arranged opposite each other with the paper tube 2 therebetween, and a pair of second crushing jigs 22 arranged opposite each other with the paper tube 2 therebetween at a position upstream of the first crushing jigs 21. The pair of first crushing jigs 21 and the pair of second crushing jigs 22 are arranged in the order of the pair of second crushing jigs 22 and the pair of first crushing jigs 21 from the opening guide 11 toward the downstream side. The pair of first crushing jigs 21 face each other in a direction perpendicular to the longitudinal direction of the paper tube 2, and the pair of second crushing jigs 22 also face each other in a direction perpendicular to the longitudinal direction of the paper tube 2. The opposing direction of the pair of first crushing jigs 21 and the opposing direction of the pair of second crushing jigs 22 are perpendicular to each other when viewed from the longitudinal direction of the paper tube 2.

[0058] 2 and 13, a pair of first crushing jigs 21 are each attached with a first actuator 23, and by operating the first actuator 23, the first crushing jig 21 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. 2) where the clamping is released. The first actuator 23 is, for example, an air pressure cylinder.

[0059] 3 and 12, a second actuator 24 is attached to each of the pair of second crushing jigs 22, and by operating the second actuator 24, the second crushing jig 22 can be moved back and forth between a pressing position (position in FIG. 3) 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 24 is, for example, an air pressure cylinder.

[0060] 3, the direction in which the paper tube 2 is crushed by the pair of second crushing jigs 22 located immediately behind the opening guide 11 is set to be the same as the width direction of the paper tube original 10 (the vertical direction in FIG. 3) at the position immediately before the opening guide 11. In addition, the direction in which the paper tube 2 is crushed by the pair of first crushing jigs 21 (the direction perpendicular to the paper surface in FIG. 3) and the direction in which the paper tube 2 is crushed by the pair of second crushing jigs 22 (the vertical direction in FIG. 3) are perpendicular to each other when viewed from the longitudinal direction of the paper tube 2.

[0061] 2 and 3, the first crushing jig 21, the second crushing jig 22, the first actuator 23, and the second actuator 24 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.

[0062] An example of a method for producing paper cushioning material 1 (see FIG. 1) using the above-mentioned device will be described.

[0063] As shown in FIG. 2, a belt-shaped paper tube original roll 10 that extends continuously in the longitudinal direction is unwound from the original roll 6, and the paper tube original roll 10 is introduced into an opening guide 11 having an inner width φ narrower than the width W of the paper tube original roll 10 as shown in FIG. 7 and FIG. 9, whereby the folded portions at both ends in the width direction of the paper tube original roll 10 are opened to deform the paper tube original roll 10 from a flat state into a cylindrical shape, forming a paper tube 2 that extends continuously in the longitudinal direction. Then, as shown in FIG. 7 and FIG. 9, while the paper tube 2 is held in a cylindrical shape by the opening guide 11 and the additional guide 20, the paper tube 2 is supplied to the triangular pyramid forming section 8 as shown in FIG. In the triangular pyramid forming section 8, the first crushing section 3 and the second crushing section 4 are formed on the paper tube 2 that has passed through the opening guide 11 and the additional guide 20 as follows.

[0064] As shown in Figures 3 and 11, first, in a state where the paper tube 2 is sandwiched from both sides by a pair of second crushing jigs 22, the frame drive device 27 (see Figure 2) is operated to move the moving frame 26 downstream (left side in the figure). At this time, the pair of second crushing jigs 22 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 22 is pulled out by a predetermined length from the paper tube forming section 7 toward the triangular pyramid forming section 8, and accordingly, the paper tube original roll 10 is unwound from the original roll roll 6 shown in Figure 2, the paper tube original roll 10 just before the opening guide 11 is introduced into the opening guide 11 and deformed into a cylindrical shape, and the paper tube original roll 10 (i.e., the paper tube 2) deformed into a cylindrical shape by the opening guide 11 is supplied from the opening guide 11 to the triangular pyramid forming section 8. Thereafter, as shown in FIG. 12, the paper tube 2 is released from the clamping by the second crushing jig 22, and the frame driving device 27 (see FIG. 2) is operated in the reverse direction to move the moving frame 26 upstream (to the right in the figure).

[0065] Next, as shown in Fig. 13, the first actuator 23 is operated to sandwich the paper tube 2 from both sides with a pair of first crushing jigs 21 and crush it flat, forming the first crushed section 3 (see Fig. 1). After that, as shown in Figs. 2 and 3, the paper tube 2 is released from being sandwiched by the first crushing jigs 21, and in this state, the second actuator 24 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 22 from both sides and crush it flat, forming the second crushed section 4 (see Fig. 1).

[0066] 2, the operation of squeezing and crushing the paper tube 2 with the second crushing jig 22 can be performed while the paper tube 2 is still being squeezed by the first crushing jig 21, but in that case, when the paper tube 2 is squeezed and crushed by the second crushing jig 22, excessive tensile force may be applied to the part of the paper that constitutes the paper tube 2 between the first crushing jig 21 and the second crushing jig 22, 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 22 while the paper tube 2 is released from being squeezed by the first crushing jig 21. In this way, when the paper tube 2 is clamped from both sides and crushed by the second crushing jig 22, excessive tensile force is prevented from acting on the part of the paper constituting the paper tube 2 between the first crushing jig 21 and the second crushing jig 22, causing the paper to tear.

[0067] Then, as shown in Figures 3 and 11, with the paper tube 2 clamped on both sides by a pair of second crushing jigs 22, the frame drive device 27 (see Figure 2) is operated to move the moving frame 26 downstream (to the left in the figure).

[0068] By repeating the above operations, the paper cushioning material 1 shown in FIG. 1 can be manufactured.

[0069] The manufacturing method of the above-mentioned paper cushioning material 1 uses a raw roll 6 formed by winding up a belt-shaped paper tube raw roll 10 in which a paper tube 2 extending continuously in the longitudinal direction is flattened over its entire length so that both widthwise ends are folded in half, as shown in Fig. 4, so there is no need for a guide member for bending the belt-shaped continuous paper extending continuously in the longitudinal direction in the width direction to deform it into a cylindrical shape, or a device for bonding one widthwise end 14 and the other widthwise end 15 of the deformed cylindrical continuous paper to form the paper tube 2. Therefore, as shown in Fig. 2, the space required for manufacturing the paper cushioning material 1 is small, and it is easy to secure the space for manufacturing the paper cushioning material 1 at the site where the paper cushioning material 1 is filled into the gap between the packaging box and the product.

[0070] In addition, in the manufacturing method of the paper cushioning material 1, the first crushed portion 3 shown in FIG. 1 is formed so that the inner surfaces of the paper tube 2 at the first crushed portion 3 are not bonded to each other, and similarly, the second crushed portion 4 is formed so that the inner surfaces of the paper tube 2 at the second crushed portion 4 are not bonded to each other, so there is no need to use heat-seal paper as the paper for forming the paper tube original roll 10 shown in FIG. 2, and it is possible to use a paper tube original roll 10 formed of non-heat-seal paper. In addition, 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 at high speed. Therefore, it is possible to reduce the manufacturing cost of the paper cushioning material 1.

[0071] Furthermore, this manufacturing method for paper cushioning material 1 produces paper cushioning material 1 in which the inner surfaces of paper tube 2 are not heat sealed together and are not bonded at first crushed section 3 and second crushed section 4 shown in Fig. 1, so when disposing of paper cushioning material 1 after use, triangular pyramid 5 can be collapsed simply by stretching paper cushioning material 1 in the longitudinal direction. Therefore, it is easy to reduce the size of paper cushioning material 1 after use, and disposal does not require much effort.

[0072] In addition, in the manufacturing method of the paper cushioning material 1, as shown in Figures 4 and 5, the paper cushioning material 1 (see Figure 1) is manufactured using a paper tube original roll 10 formed by envelope pasting in which the back surface of the other widthwise end 15 of the continuous paper is overlapped and bonded to the front surface of one widthwise end 14 of the continuous paper, so that it is possible to reliably prevent a situation in which the product is 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, it is also possible to form the paper tube original roll 10 by palm-to-pallet pasting (a method in which the back surfaces of one widthwise end 14 and the other widthwise end 15 of the continuous paper are overlapped and bonded) instead of envelope pasting, but in this case, the paper cushioning material 1 formed from the paper tube original roll 10 has a palm-to-pallet portion that protrudes from the outer periphery of the paper tube 2 when viewed from the longitudinal direction, and the tip of the palm-to-pallet 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 Figures 4 and 5, when a paper tube original roll 10 is formed by pasting an envelope, the paper cushioning material 1 formed from the paper tube original roll 10 does not have any protruding parts from the outer circumference of the paper tube 2 when viewed in the longitudinal direction, so it is possible to reliably prevent the paper cushioning material 1 from damaging the product.

[0073] Furthermore, the manufacturing method for this paper cushioning material 1 uses paper tube original roll 10 at one end in the width direction, where overlapping portion 16 (i.e., a portion of paper tube original roll 10 that is relatively rigid and relatively resistant to deformation) is located at one end in the width direction, by overlapping the front surface of one end in the width direction 14 of the continuous paper with the back surface of the other end in the width direction 15, as shown in Fig. 5, so that ease of deformation of the central portion in the width direction of paper tube original roll 10 can be ensured. Therefore, in opening guide 11 shown in Fig. 2, paper tube original roll 10 can be stably deformed from a flat state into a cylindrical shape.

[0074] Furthermore, the manufacturing method for this paper cushioning material 1 uses paper tube original roll 10 in which one widthwise end of paper tube original roll 10 is folded in half so that overlapping portion 16 (i.e., the portion of paper tube original roll 10 that is relatively rigid and relatively resistant to deformation) is folded in half, as shown in Fig. 5, and therefore a force that tries to open the folded portion at one widthwise end of paper tube original roll 10 is generated by the restoring force of the paper that constitutes overlapping portion 16, as shown in Fig. 8. Therefore, in opening guide 11 shown in Fig. 2, the paper that constitutes paper tube original roll 10 is less likely to deform and sink toward the inner diameter side, and paper tube original roll 10 can be stably deformed into a cylindrical shape.

[0075] The manufacturing method of the paper cushioning material 1 is as follows: 2 or more (preferably 120 g / m 2 Since the paper tube original roll 10 is made of paper having a basis weight of 280 g / m or more, the paper forming the paper tube original roll 10 is not too soft, and when both ends of the paper tube original roll 10 in the width direction are opened and pressed by guides 11 as shown in Figs. 7 and 9, the folded parts at both ends in the width direction of the paper tube original roll 10 can be stably opened. 2 or less (preferably 220 g / m 2 Since the paper tube raw material 10 is formed from paper having a basis weight of 100 g / m2 or less (hereinafter), the material cost of the paper cushioning material 1 can be reduced.

[0076] Furthermore, as shown in Figure 2, in the manufacturing method of this paper cushioning material 1, the extension direction (vertical direction in Figure 2) of the second crushing portion 4 formed by a pair of second crushing tools 22 located immediately behind the opening guide 11 is perpendicular to the width direction (direction perpendicular to the paper surface in Figure 2) of the paper tube original roll 10 located immediately before the opening guide 11, so that it is possible to stably deform the paper tube original roll 10 from a flat state to a cylindrical shape at the position of the opening guide 11.

[0077] Figures 14 and 15 show another example of a manufacturing device for the paper cushioning material 1. The manufacturing device shown in Figures 14 and 15 differs from the manufacturing device shown in Figures 2 and 3 in the way in which the paper tube original roll 10 is fed, but the rest of the configuration is the same. Therefore, parts corresponding to those in the manufacturing device shown in Figures 2 and 3 are given the same reference numerals and descriptions thereof will be omitted.

[0078] As shown in Fig. 14, a feed roller 30 is provided immediately before the opening guide 11. The feed roller 30 is provided in contact with the outer periphery of the guide roller 13 so as to sandwich the cylindrical original roll 10 between the outer periphery of the guide roller 13 and the outer periphery of the feed roller 30. An electric motor 31 (see Fig. 15) that rotates the feed roller 30 is connected to the feed roller 30. In the figure, the electric motor 31 is connected only to the feed roller 30, but the electric motor 31 may be connected to both the feed roller 30 and the guide roller 13 to rotate both the feed roller 30 and the guide roller 13.

[0079] 14, the first crushing jig 21, the second crushing jig 22, the first actuator 23, and the second actuator 24 are attached to a fixed frame 32. This fixed frame 32 is not provided with a device corresponding to the frame driving device 27 shown in FIG.

[0080] 14 is capable of sending out a predetermined length of the paper tube original roll 10 immediately before the feed roller 30 downstream by rotating the feed roller 30 a predetermined amount with the electric motor 31. At this time, the paper tube original roll 10 is unwound from the original roll roll 6 by a predetermined length, and the paper tube original roll 10 immediately before the opening guide 11 is introduced into the opening guide 11 and deformed into a cylindrical shape, and the paper tube original roll 10 deformed into a cylindrical shape by the opening guide 11 (i.e., the paper tube 2) is supplied from the opening guide 11 to the triangular pyramid forming section 8.

[0081] When the manufacturing apparatus shown in Figure 14 is used, no space is required for the moving frame 26 to move, compared to when the manufacturing apparatus used in Figure 2 is used, so it is possible to make the space required to manufacture the paper cushioning material 1 smaller.

[0082] In the above embodiment, as shown in Fig. 5, the overlapping portion 16 is located at one end of the width direction of the paper tube original roll 10, and the overlapping portion 16 is folded in half. However, as shown in Fig. 6, a paper tube original roll 10 in which the overlapping portion 16 is not folded in half but is located at one end of the width direction of the paper tube original roll 10 can also be used. Even in this case, since the overlapping portion 16 (i.e., the portion of the paper tube original roll 10 that is relatively rigid and relatively difficult to deform) is located at one end of the width direction, it is possible to ensure the ease of deformation of the central portion of the width direction of the paper tube original roll 10. Therefore, in the opening guide 11 shown in Fig. 2, it is possible to stably deform the paper tube original roll 10 from a flat state to a cylindrical shape.

[0083] In the above embodiment, as shown in Fig. 9, a cylindrical guide hole 19 with a closed inner circumference is used, and the inner surface of the guide hole 19 guides the entire outer circumference of the paper tube 2, but as shown in Fig. 16, a guide hole 19 having a partially cylindrical inner surface only at the portions corresponding to both ends of the paper tube original roll 10 in the width direction and an open portion corresponding to the center of the paper tube original roll 10 in the width direction may be used, as shown in Fig. 17, a diamond-shaped guide hole 19 with a closed inner circumference may be used, and as shown in Fig. 18, a guide hole 19 having a V-groove-shaped inner surface only at the portions corresponding to both ends of the paper tube original roll 10 in the width direction and an open portion corresponding to the center of the paper tube original roll 10 in the width direction may be used. It is also possible to use a truncated cone-shaped guide hole 19 whose inner diameter gradually decreases from the upstream side to the downstream side. [Explanation of symbols]

[0084] 1 Paper cushioning material 2 paper tube 3 First crushing section 4 Second crushing section 5 triangular pyramid 6 Raw material roll 10 Original paper tube 11 Opening guide 14 One end in the width direction 15 Other end in width direction 16 Overlapped section 17 Double fold 18 Fabric holder 21 First crushing jig 22 Second crushing jig W width φ Inner width

Claims

1. A raw roll (6) is used, which is formed by winding up a belt-shaped paper tube raw roll (10) in which a paper tube (2) extending continuously in the longitudinal direction is flattened over its entire length so that both ends in the width direction are folded in half, The paper tube original roll (10) is unwound from the original roll roll (6) and introduced into an opening guide (11) having an inner width (φ) narrower than the width (W) of the paper tube original roll (10), thereby opening the paper tube original roll (10) from its flat state by folding both ends in half in the width direction to form a paper tube (2) that extends continuously in the longitudinal direction; A method for manufacturing a paper cushioning material in which a first crushed section (3) is formed by crushing a portion of the length of the paper tube (2) flat, and a second crushed section (4) is formed by crushing a portion of the length of the paper tube (2) flat from a direction different from the crushing direction of the first crushed section (3) when viewed from the longitudinal direction, and these sections are alternately formed at intervals in the longitudinal direction of the paper tube (2), 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) to obtain the paper cushioning material (1).

2. When forming the first crushed portion (3), the first crushed portion (3) is formed so that the inner surfaces of the paper tube (2) at the first crushed portion (3) are not bonded to each other; A manufacturing method for paper cushioning material as described in claim 1, characterized in that when forming the second crushed portion (4), the second crushed portion (4) is formed so that the inner surfaces of the paper tube (2) at the second crushed portion (4) are not bonded to each other.

3. 3. The method for manufacturing a paper cushioning material according to claim 2, wherein the paper tube raw material (10) is formed of non-heat sealable paper that is not coated with a heat sealant.

4. A method for manufacturing paper cushioning material as described in any one of claims 1 to 3, wherein the paper tube original (10) is formed by envelope pasting, in which the back surface of one widthwise end (14) of the continuous paper is overlapped and glued to the back surface of the other widthwise end (15).

5. A method for manufacturing paper cushioning material as described in claim 4, in which an overlapping portion (16) in which the paper is doubled by overlapping the front surface of one widthwise end (14) of the continuous paper with the back surface of the other widthwise end (15) is positioned at one widthwise end of the paper tube roll (10).

6. A method for manufacturing paper cushioning material as described in claim 5, wherein the overlapping portion (16) is provided at the position of a fold line (17) at one end of the width direction of the paper tube original (10) so that the overlapping portion (16) is folded in half.

7. The paper tube raw material (10) has a weight of 50 to 280 g / m ２ 4. The method for producing a paper cushioning material according to claim 1, wherein the paper cushioning material is made of paper having a basis weight of 1000 g / m2 or more.

8. The first crushed portion (3) is formed by clamping a part of the longitudinal direction of the paper tube (2) with a pair of first crushing jigs (21) arranged opposite each other with the paper tube (2) therebetween and crushing it flat, The second crushed portion (4) is formed by clamping a part of the longitudinal direction of the paper tube (2) with a pair of second crushing jigs (22) arranged opposite each other with the paper tube (2) therebetween from a direction different from the crushing direction by the pair of first crushing jigs (21) as viewed from the longitudinal direction, thereby crushing the part flat. The pair of first crushing jigs (21) and the pair of second crushing jigs (22) are arranged in the following order from the opening guide (11) toward the downstream side: the pair of second crushing jigs (22) and the pair of first crushing jigs (21); A method for manufacturing paper cushioning material as described in any one of claims 1 to 3, wherein the direction in which the paper tube (2) is crushed by the pair of second crushing jigs (22) located immediately behind the opening guide (11) is set to the same direction as the width direction of the paper tube original roll (10) at a position immediately before the opening guide (11).

9. A method for manufacturing paper cushioning material as described in any one of claims 1 to 3, wherein a roll presser (18) for applying resistance to downstream movement of the paper tube roll (10) is provided immediately before the opening guide (11).

10. The paper roll (6) is formed by winding up a belt-shaped paper tube original (10) made by flattening a paper tube (2) extending continuously in the longitudinal direction over its entire length so that both ends in the width direction are folded in half.

11. The paper roll (6) according to claim 10, wherein the paper tube paper roll (10) is formed of non-heat sealable paper that is not coated with a heat sealant.

12. The paper tube original roll (10) is formed by envelope pasting in which the back surface of one widthwise end (15) of the continuous paper is overlapped and glued to the front surface of one widthwise end (14) of the continuous paper.

13. The paper roll (6) described in claim 12 has an overlapping portion (16) in which the paper is doubled by overlapping the front surface of one widthwise end (14) of the continuous paper with the back surface of the other widthwise end (15), and the overlapping portion (16) is arranged at one widthwise end of the paper tube original (10).

14. The paper roll (6) according to claim 13, wherein the overlapping portion (16) is provided at a fold line (17) at one end of the width direction of the paper tube paper roll (10) so that the overlapping portion (16) is folded in half. 【Request 15】 The paper tube raw material (10) has a weight of 50 to 280 g / m ２ 12. The paper roll (6) according to claim 10 or 11, which is made of paper having a basis weight of 100%.

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