Processing tool for paper cardboard, and molding method
A small, lightweight processing tool with notch grooves addresses the limitations of existing methods by forming cardboard ends into desired shapes without auxiliary materials, enhancing aesthetics and adhesion while allowing manual operation.
Patent Information
- Application Number
- JP2023219860
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-12-26
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2043-12-26
AI Technical Summary
Existing methods for processing the ends of cardboard boxes, such as attaching decorative tapes or thermoforming, are limited to straight lines and require auxiliary materials, leading to wrinkles, damage, or the inability to form shapes with bent corners, and are often associated with large, cumbersome equipment.
A small, lightweight processing tool with notch grooves of specific dimensions and configurations, including U-shaped or W-shaped cross-sections, allows for forming cardboard ends into arc shapes or shapes with bent corners without auxiliary materials, enabling manual operation and intermittent processing.
The tool effectively forms cardboard ends into desired shapes with reduced risk of damage, wrinkles, and manual operation, improving aesthetics and adhesion while reducing the need for additional materials and equipment size.
Smart Images
Figure 2025102422000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an instrument for processing the shape of the end of a cardboard box.
Background Art
[0002] Conventionally, when processing the end of a cardboard box, there has been a method of attaching a tape. In this case, there are advantages that the aesthetics are improved and there is no concern about cutting one's hand at the end. For example, in Patent Document 5, an instrument for continuously attaching tapes to both side surfaces of a cardboard box so as to close the end is disclosed. Since this is a method of pushing the cardboard box into a long linear groove provided on the instrument, the end is limited to a straight line.
[0003] Also, for a plastic hollow sheet or a plastic cardboard box, a method of thermoforming is known. In Patent Documents 1 and 6, apparatuses for heating and softening a hollow sheet or a cardboard box and then forming it with an arc-shaped mold and thereafter cooling it to fix the shape are disclosed. Also in this case, the end is limited to a straight line and the apparatus is large-sized.
[0004] Also, for a vehicle board member having a hollow interior, a method of thermoforming is known. In Patent Document 2, an apparatus for folding both side surfaces of the board member in the direction of the center of the thickness is disclosed. Also in this case, the apparatus is large-sized.
[0005] Also, among the methods of thermoforming a plastic hollow sheet or a plastic cardboard box, a method of forming using rollers is also known. In Patent Documents 3 and 4, apparatuses for forming the end into an arc shape are disclosed.
Prior Art Documents
Patent Documents
[0006]
Patent Document 1
Patent Document 2
Patent Document 3
Patent Document 4
Patent Document 5
Patent Document 6
Summary of the Invention
Problems to be Solved by the Invention
[0007] When attaching a decorative tape to the end as in Patent Document 5, it is necessary to prepare a cardboard with the tape attached to one side in advance, which increases the number of components and takes time. Also, when the end is curved, when folding from one side to the opposite side, wrinkles are always formed on the decorative tape, so it cannot be neatly pasted.
[0008] In the cases of Patent Document 1 and Patent Document 6, the material to be processed is a material that softens with heat. However, in the case of paper cardboard, since the deformation resistance and sliding resistance of the forming part are large, as shown in Fig. 9, it can be predicted that the cardboard will break and cannot be formed.
[0009] The case of Patent Document 2 also has a material to be processed that softens with heat. However, in the case of paper cardboard, since the deformation resistance of the forming part is large, as shown in Fig. 10, the cardboard is crushed near the forming part and "wrinkles" are formed, so it can be predicted that the appearance will be damaged.
[0010] In the cases of Patent Document 1 and Patent Document 6, since the structure is to push the cardboard along a linear mold, it is obvious that it cannot be processed when the end is curved, and a lightweight and small device cannot be realized. Also, a forming form in which the end cross-section of the cardboard is formed into a shape where both corners are bent at right angles and butted in the center has not been realized.
[0011] In the cases of Patent Document 3 and Patent Document 4, although the material to be processed is a material that softens with heat, if it is a roller-type processing tool, the part where the processing tool acts is local. When completing the forming, if the pressure contact rolling on the processing tool is carried out in several steps, the deformation resistance per time of the forming part is small. Also, since the contact area between the processing tool and the cardboard is small, the frictional resistance is small, so it can also be applied to paper cardboard. However, the end forming shapes disclosed so far are only arc shapes, and a forming form in which the end cross-section of the cardboard has a shape where both corners are bent at right angles and butted at the center has not been realized.
[0012] An object of the present invention is to provide a tool that can form the end of paper cardboard without using auxiliary materials such as decorative tapes, can correspond not only to straight lines but also to curves at the end, can perform intermittent processing, and can be manually operated due to its small size and light weight.
Means for Solving the Problems
[0013] A first invention is a processing tool for paper cardboard in which a notch groove is provided in the small end portion of a plate-like body having a plate thickness of 2 to 3T in the same direction as the plate thickness direction with respect to the thickness T of the paper cardboard whose end is processed. The notch groove has an arc-shaped bottom surface, and its upper part is in a U-shaped cross-section that opens to the surface of the small end portion. Further, the U-shaped cross-section of the notch groove is as follows: (1) The arc radius of the bottom surface of its cross-section is 0.5 to 0.6T. (2) The depth from the bottom surface of its cross-section to the surface of the small end portion is 0.8 to 1.5T. (3) The opening angle of the two straight lines in contact with both ends of the arc of the bottom surface of its cross-section is 5 to 10°. (4) The chamfer formed by its inner wall surface and the surface of the small end portion and / or both surfaces of the plate-like body has a radius of 0.5 to 1.0T. (5) A pressure contact sliding portion composed of a flat portion (width length 0.5 to 1.0T) and a rounded portion (chamfer radius 0.5 to 1.0T) that comes into contact with the end of the paper cardboard is provided on the bottom surface of the notch groove. Furthermore (6) The separation dimension between the two inner wall surfaces facing each other with the notch groove formed is 1.0 to 1.2T. It is a processing tool for cardboard characterized by comprising at least the above components.
[0014] A second invention is a processing tool for cardboard in which a notch groove is provided in the same direction as the plate thickness direction at the small end of a plate-like body having a plate thickness of 2 to 3T with respect to the thickness T of the cardboard whose end is processed. The notch groove has a substantially W-shaped bottom surface with rounded corners, and its upper part opens to the surface of the small end. Further, the substantially W-shaped notch groove has: (1) The radius of the rounded parts at both ends of the substantially W-shaped bottom surface in the cross-section is 0.1 to 0.2T. (2) The radius of the rounded part at the central raised part of the substantially W-shaped bottom surface in the cross-section is 0.1 to 0.5T. (3) The height difference between the central raised part and the two end valleys of the substantially W-shaped bottom surface in the cross-section is 0.05 to 0.16T. (4) The distance between the contact points of the rounded parts at both ends of the substantially W-shaped bottom surface in the cross-section and the two straight lines is 1.0 to 1.1T. (5) The depth from the deepest part of the bottom surface of the notch groove to the surface of the small end is 0.8 to 1.5T. (6) The opening angle between the two straight lines in contact with the rounded parts at both ends of the substantially W-shaped bottom surface in the cross-section is 5 to 10°. (7) The chamfering formed by the inner wall surface and the surface of the small end and / or both surfaces of the plate-like body has a radius of 0.5 to 1.0T. (8) A pressure contact sliding part composed of a flat part (width length 0.5 to 1.0T) and a rounded corner part (chamfering radius 0.5 to 1.0T) for contacting the end of the cardboard is provided on the bottom surface of the notch groove. Furthermore (9) The separation dimension between the two inner wall surfaces facing each other with the notch groove formed is 1.0 to 1.2T. It is a processing tool for cardboard characterized by comprising at least the above components.
[0015] The third invention is a processing tool for cardboard, in which a notched groove portion is provided along the circumferential direction on the outer peripheral surface of a disk-shaped plate body with a plate thickness of 2 to 3T with respect to the thickness T of the cardboard whose end is processed, and the disk-shaped plate body is axially attached and configured to be rotatable. The notched groove portion has a substantially W-shaped bottom surface with rounded corners, and its upper part opens to the outer peripheral surface of the disk-shaped plate body. Further, the substantially W-shaped of the notched groove portion (1) The radius of the rounded portions at both ends of the substantially W-shaped bottom surface in its cross-section is 0.1 to 0.2T. (2) The radius of the rounded portion at the central raised portion of the substantially W-shaped bottom surface in its cross-section is 0.1 to 0.5T. (3) The height difference between the central raised portion and the both end valleys of the substantially W-shaped bottom surface in its cross-section is 0.05 to 0.16T. (4) The distance between the contact points of the rounded portions at both ends of the substantially W-shaped bottom surface in its cross-section and the two straight lines is 1.0 to 1.1T. (5) The depth from the deepest part of the bottom surface of the notched groove portion to the outer peripheral surface of the disk-shaped plate body is 0.8 to 1.5T. (6) The opening angle between the two straight lines in contact with the rounded portions at both ends of the substantially W-shaped bottom surface in its cross-section is 5 to 10°. (7) The chamfer formed by its inner wall surface and the outer peripheral surface of the disk-shaped plate body has a radius of 0.5 to 1.0T. (8) An annular contact portion for press-contacting and rolling on the end of the cardboard is provided on the bottom surface of the notched groove portion. Furthermore (9) The separation dimension between the two inner wall surfaces facing each other and forming the notched groove portion is 1.0 to 1.2T. It is a processing tool for cardboard, characterized by comprising at least the above components.
[0016] The fourth invention is the processing tool for cardboard according to any one of the first invention, the second invention, or the third invention, characterized in that the surface roughness of the inner wall surface of the notched groove portion and the chamfered portion is Ra12.5 (JIS B 0601) or less.
[0017] The fifth invention is a molded product of the cardboard obtained by pressing and sliding, or pressing and rolling the notch groove portion of the processing tool against the end of the cardboard using the processing tool for cardboard according to any one of the first invention, the second invention, or the third invention, so that the end cross-section of the cardboard is formed into an arc shape, or a shape in which both corner portions are bent at right angles and abutted at the center.
[0018] The sixth invention is a molded product of the cardboard obtained by pressing and sliding, or pressing and rolling the notch groove portion of the processing tool against the end of the cardboard using the processing tool for cardboard according to the fourth invention, so that the end cross-section of the cardboard is formed into an arc shape, or a shape in which both corner portions are bent at right angles and abutted at the center.
[0019] The seventh invention is a method for molding cardboard, which uses the processing tool for cardboard according to any one of the first invention, the second invention, or the third invention, and presses and slides, or presses and rolls the notch groove portion of the processing tool against the end of the cardboard, so that the end cross-section of the cardboard is formed into an arc shape, or a shape in which both corner portions are bent at right angles and abutted at the center.
[0020] The eighth invention is a method for molding the cardboard, which uses the processing tool for cardboard according to the fourth invention, and presses and slides, or presses and rolls the notch groove portion of the processing tool against the end of the cardboard, so that the end cross-section of the cardboard is formed into an arc shape, or a shape in which both corner portions are bent at right angles and abutted at the center.
Advantages of the Invention
[0021] According to the present invention, at the end of the cardboard, it is possible to obtain a cardboard that is excellent in eliminating the risk of cutting hands at the cut corners, improving the aesthetic appearance, and facilitating end adhesion, without using auxiliary materials such as decorative tapes.
Brief Description of the Drawings
[0022]
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Embodiments for Carrying Out the Invention
[0023] Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
Examples
[0024] FIG. 1 shows a processing tool 1 according to an embodiment of the first invention. In a processing tool for cardboard, in which a notch groove is provided in the short side portion of a plate-like body having a plate thickness 1g of 2 to 3T with respect to the thickness T of the cardboard whose end is to be processed, in the same direction as the plate thickness direction, the notch groove has an arcuate bottom surface and has a U-shaped cross-section with its upper part opening to the surface of the short side portion. Further, the U-shaped notch groove (1) has a radius 1a of the arc at the bottom surface of the cross-section of 0.5 to 0.6T. (2) has a depth 1k from the bottom surface of the cross-section to the surface of the short side portion of 0.8 to 1.5T. (3) has an opening angle 1f of 5 to 10° between two straight lines in contact with both ends of the arc at the bottom surface of the cross-section. (4) has a chamfer 1j formed by the inner wall surface and the surface of the short side portion and / or both surfaces of the plate-like body with a radius of 0.5 to 1.0T. (5) A pressure contact sliding portion composed of a flat portion 1h (width length 0.5 to 1.0T) and a rounded portion 1s (chamfer radius 0.5 to 1.0T) that abuts against the end of the cardboard is provided on the bottom surface of the notch groove. Furthermore (6) has a separation dimension 1m between two inner wall surfaces facing each other and forming the notch groove of 1.0 to 1.2T. A processing tool for cardboard, characterized by comprising at least the above components.
[0025] Note that the "separation dimension 1m between two inner wall surfaces" represents the distance between two non-parallel planes and varies depending on the depth from the surface of the short side portion. In FIG. 1 (E), the distance at the middle portion of the notch groove depth is shown as an example.
[0026] Figure 4 shows the processing steps when the linear end is processed by the processing tool 1. Figure 4(B) shows the state before starting the processing of pressing and sliding in a direction orthogonal to the cardboard thickness while applying a pressing force F with the groove of the processing tool 1 facing downward on the upper surface of the cardboard dunnage 4 before processing. After starting, both corner portions of the dunnage end hit so as to contact the groove curved surface, and each time the pressing and sliding is repeated several times, deformation progresses in the direction of the center of the cardboard thickness following the groove shape, and finally, as shown in Figure 4(D), the end cross-section is formed into an arc shape. Note that the rounded portion 1s which is a part of the flat portion 1h and the chamfer 1j shown in Figure 1(F) contacts the cardboard during this pressing and sliding. Here, the T-T cross-section is shown as an example, but at each position of 1a and 1d in Figure 1(E), it has the same cross-sectional shape as Figure 1(F).
Embodiment
[0027] Figure 2 shows a processing tool 2 according to an embodiment of the second invention. In a processing tool for cardboard in which a notch groove portion is provided in the direction of the plate thickness in the small opening portion of a plate-like body where the plate thickness 2g is 2 to 3T with respect to the thickness T of the cardboard whose end is processed, the notch groove portion has a substantially W-shaped bottom surface with rounded corners, and its upper part opens to the surface of the small opening portion. Further, the substantially W-shaped notch groove portion, (1) The radius of the rounded portions 2a at both ends of the substantially W-shaped bottom surface of its cross-section is 0.1 to 0.2T. (2) The radius of the rounded portion 2b at the central raised portion of the substantially W-shaped bottom surface of its cross-section is 0.1 to 0.5T. (3) The height difference 2n between the central raised portion and both end valley portions of the substantially W-shaped bottom surface of its cross-section is 0.05 to 0.16T. (4) The distance 2e between the contact points of the rounded portions at both ends of the substantially W-shaped bottom surface of its cross-section and the two straight lines is 1.0 to 1.1T. (5) The depth 2k from the deepest part of the bottom surface of its cross-section to the surface of the small opening portion is 0.8 to 1.5T. (6) The opening angle 2f of the two straight lines in contact with the rounded portions at both ends of the substantially W-shaped bottom surface of its cross-section is 5 to 10°. (7) The chamfer 2j formed by the inner wall surface, the surface of the small opening portion, and / or both surfaces of the plate-like body has a radius of 0.5 to 1.0T. (8) On the bottom surface of the notch groove portion, there is provided a pressure contact sliding portion composed of a flat portion 2h (width length 0.5 to 1.0T) that abuts against the end portion of the paper cardboard and a rounded portion 2s (chamfer radius 0.5 to 1.0T). Furthermore (9) The separation dimension 2m between the two inner wall surfaces that form the notch groove portion is 1.0 to 1.2T. A processing tool for paper cardboard, characterized by comprising at least the above components.
[0028] Note that the "separation dimension 2m between the two inner wall surfaces" represents the distance between two non-parallel planes and varies depending on the depth from the surface of the small opening portion. In FIG. 2(E), as an example, the distance at the middle part of the notch groove depth is shown.
[0029] FIG. 8 shows the processing steps when the linear end portion is processed by the processing tool 2. FIG. 8(B) shows the state before starting the processing of pressing and sliding in a direction orthogonal to the cardboard thickness while pressing the groove of the processing tool 2 downward on the upper surface of the cardboard 4 before processing. After starting, both corner portions of the cardboard end abut against the rounded portions at both ends of the substantially W-shaped bottom surface of the notch groove portion. Each time the pressure contact sliding is repeated several times, deformation progresses in the direction of the center of the cardboard thickness following the groove shape, and the forming is completed when the two corner portions before the start of forming meet at the center of the cardboard plate thickness. At this time, due to the substantially W-shaped central raised portion on the bottom surface of the notch groove portion, the folded-back portions of both corner portions of the cardboard at the time of forming completion become acute angles. When the processing tool separates after the forming is completed, due to the springback of the folded-back portions of both corner portions, the folded-back portions become right angles, and a shape in which both corner portions are bent at right angles and meet at the center is formed as shown in FIG. 11. Note that during this pressure contact sliding, what contacts the cardboard is the flat portion 2h and a part of the chamfer 2j, which is the rounded portion 2s shown in FIG. 2(F). Here, a V-V cross-section is shown as an example, but at each of the positions 2a, 2b, and 2d in FIG. 2(E), it has the same cross-sectional shape as FIG. 2(F).
Example
[0030] Figure 3 shows a processing tool 3 according to an embodiment of the third invention. In a processing tool for cardboard in which a notch groove is provided along the circumferential direction on the outer peripheral surface of a disk-shaped plate body 3p having a plate thickness of 2 to 3T with respect to the thickness T of the cardboard whose end is to be processed, and the disk-shaped plate body 3p is pivotally attached to a support portion 3q by a pin 3r and configured to be rotatable, the notch groove has a substantially W-shaped bottom surface with rounded corners, and its upper part opens to the outer peripheral surface of the disk-shaped plate body 3p. Further, the substantially W-shaped notch groove has the following characteristics: (1) The radius of the rounded portions 3a at both ends of the substantially W-shaped bottom surface of its cross section is 0.1 to 0.2T. (2) The radius of the rounded portion 3b at the central raised portion of the substantially W-shaped bottom surface of its cross section is 0.1 to 0.5T. (3) The height difference 3n between the central raised portion and the both-end valley portions of the substantially W-shaped bottom surface of its cross section is 0.05 to 0.16T. (4) The distance 3e between the contact points of the rounded portions at both ends of the substantially W-shaped bottom surface of its cross section and the two straight lines is 1.0 to 1.1T. (5) The depth 3k from the deepest part of the bottom surface of the notch groove to the outer peripheral surface of the disk-shaped plate body 3p is 0.8 to 1.5T. (6) The opening angle 3f of the two straight lines in contact with the rounded portions at both ends of the substantially W-shaped bottom surface of its cross section is 5 to 10°. (7) The chamfer 3j formed by its inner wall surface and the outer peripheral surface of the disk-shaped plate body 3p has a radius of 0.5 to 1.0T. (8) An annular contact portion for pressing and rolling on the end of the cardboard is provided on the bottom surface of the notch groove. Furthermore (9) The separation dimension 3m between the two inner wall surfaces facing each other and forming the notch groove is 1.0 to 1.2T. A processing tool for cardboard, characterized by comprising at least the above components.
[0031] Note that the "distance of 3 m between the two inner wall surfaces" represents the distance between the two conical curved surfaces, which varies depending on the depth from the outer peripheral surface of the disk-shaped plate body 3a. In FIG. 3(E), as an example, the distance at the midsection of the notch groove depth is shown.
[0032] When the groove of the disk-shaped plate body 3p is pressed against a cardboard with linear ends and the press-contact rolling is repeated several times in a direction orthogonal to the cardboard thickness, similar to the processing tool 2, a shape is formed in which both corners are bent at right angles and abutted at the center as shown in FIG. 11. Note that the annular contact portions in contact with the cardboard during this press-contact rolling are 3a and 3b shown as the portions constituting the inner wall surface in FIG. 3(E).
Example
[0033] The processing tool according to the embodiment of the fourth invention is the processing tool for the cardboard as described in any one of the first invention, the second invention, or the third invention, characterized in that the surface roughness of the inner wall surface of the notch groove portion and the chamfered portion is Ra12.5 (JIS B 0601) or less.
[0034] Since the surface roughness is Ra12.5 (JIS B 0601) or less, the frictional resistance when the notch groove portion of the processing tool is press-contact slid or press-contact rolled against the end of the cardboard is reduced, so that the force required for forming can be reduced. Also, since the unevenness on the surface of the processing tool is small, it is less likely to leave rubbing marks on the forming surface.
Example
[0035] The cardboard according to the embodiment of the fifth invention is a molded product of the cardboard in which the end cross-section of the cardboard is formed into an arc shape or a shape in which both corners are bent at right angles and abutted at the center by using the processing tool for the cardboard as described in any one of the first invention, the second invention, or the third invention and press-contact sliding or press-contact rolling the notch groove portion of the processing tool against the end of the cardboard.
Example
[0036] The cardboard box according to the sixth invention is a molded product of the cardboard box formed by pressing and sliding, or pressing and rolling the notch groove portion of the processing tool against the end portion of the cardboard box using the processing tool for cardboard boxes described in the fourth invention, so that the cross-section of the end portion of the cardboard box is formed into an arc shape, or a shape in which both corner portions are bent at right angles and butted against each other at the center.
[0037] Since the surface roughness of the processing tool is Ra12.5 (JIS B 0601) or less, it is difficult for rubbing marks to adhere to the molding surface, and it is clean.
Example
[0038] The molding method according to the seventh invention is a molding method of a cardboard box in which the notch groove portion of the processing tool is pressed and slid, or pressed and rolled against the end portion of the cardboard box using the processing tool for cardboard boxes described in any one of the first invention, the second invention, or the third invention, so that the cross-section of the end portion of the cardboard box is formed into an arc shape, or a shape in which both corner portions are bent at right angles and butted against each other at the center.
Example
[0039] The molding method according to the eighth invention is a molding method of a cardboard box in which the notch groove portion of the processing tool is pressed and slid, or pressed and rolled against the end portion of the cardboard box using the processing tool for cardboard boxes described in the fourth invention, so that the cross-section of the end portion of the cardboard box is formed into an arc shape, or a shape in which both corner portions are bent at right angles and butted against each other at the center.
[0040] Since the surface roughness of the processing tool is Ra12.5 (JIS B 0601) or less, the frictional resistance when the notch groove portion of the processing tool is pressed and slid, or pressed and rolled against the end portion of the cardboard box is reduced, so that the force required for molding can be reduced. Also, it is difficult for rubbing marks to adhere to the molding surface.
Example
[0041] The above is an example for implementing the present invention. However, the present invention is not limited to the above embodiments and can be appropriately modified without departing from the spirit of the present invention.
[0042] For example, the arc shape of the bottom surface of the notch groove of the processing tool 1 may be an ellipse instead of a perfect circle.
[0043] Also, in the processing tool 1, the processing tool 2, and the processing tool 3, the opening angles 1f, 2f, and 3f of the two straight lines in contact with the curve of the bottom surface of the notch groove may be 1 to 30°.
[0044] Also, in the processing tool 2 and the processing tool 3, the radii 2a and 3a of the rounded portions at both ends of the substantially W-shaped bottom surface of the notch groove may be 0.08 to 0.2T, the radii 2b and 3b of the rounded portions at the central raised portion of the substantially W-shaped bottom surface of the notch groove may be 0.1 to 0.8T, and the height differences 2n and 3n between the central raised portion and the valleys at both ends of the substantially W-shaped bottom surface of the notch groove may be 0.04 to 0.2T. Further, the distances 2e and 3e between the contacts of the rounded portions at both ends of the substantially W-shaped bottom surface of the notch groove and the two straight lines at both ends may be 1.0 to 1.2T.
[0045] Also, in the processing tool 1 and the processing tool 2, the plate thicknesses 1g and 2g may be 1 to 8T, the depths 1k and 2k from the deepest part of the bottom surface of the notch groove to the surface of the small end may be 0.6 to 4T, the chamfers 1j and 2j formed by the inner wall surface of the notch groove and the small end surface and / or both surfaces of the plate-like body may have a radius of 0.2 to 2T, and the widths 1h and 2h of the flat portions may be 0 to 7T.
[0046] Also, in the processing tool 1, the processing tool 2, and the processing tool 3, the separation dimensions 1m, 2m, and 3m between the two inner wall surfaces forming the notch groove and facing each other may be 1.0 to 2.6T.
[0047] Also, in the processing tool 3, the chamfer 3j formed by the inner wall surface of the notch groove and the outer peripheral surface of the disk-shaped plate body may have a radius of 0.2 to 2T.
[0048] In addition, the end of the cardboard to be formed is not limited to a straight line, and as shown in FIGS. 5 and 6, the cardboard end can also be formed into a convex curve or a concave curve.
[0049] Also, the cardboard to be formed is not limited to a plane, and as shown in FIG. 7, the cardboard end can be formed even on a curved surface.
[0050] Structurally, the thickness of the instrument is small, and the width of the part in contact with the cardboard is even smaller, so intermittent forming is also possible.
[0051] In addition, with processing tools 1 to 3, the inner wall surface and the chamfered part of the notch groove are all set to Ra12.5 (JIS B 0601) or less, but Ra6.3 (JIS B 0601) or less is desirable. Compared with the conventional method of thermoforming a plastic hollow sheet or a plastic cardboard, in the case of a cardboard, since the deformation resistance and sliding resistance of the forming part are large, there is a problem that if it exceeds Ra12.5 (JIS B 0601), abrasion marks are likely to appear on the forming surface. For this solution, it is desirable that the surface roughness is smaller.
[0052] Also, the chamfer formed by the inner wall surface of the notch groove and other surfaces is not limited to a curved surface with a radius of 0.5 to 1.0T, and it may also be a shape cut linearly to remove the corners.
[0053] Note that the material of the processing tool in the above embodiment only needs to have a large friction coefficient such as rubber, and there is no restriction as long as it has a certain strength, such as plastic, metal, glass, ceramics, wood, etc. However, from the perspective of mass productivity, plastic is desirable.
[0054] Using the processing tool for cardboard according to any one of the first invention, the second invention, or the third invention, by pressing and sliding or pressing and rolling the notch groove of the processing tool against the end of the cardboard, after a part of the forming is completed, move to the adjacent part, and the processing range can be expanded.
[0055] Since the processing tool is small and lightweight, it is possible to process, for example, the inner peripheral end face of a circular hole in cardboard.
[0056] All corners formed by the inner wall surface of the notch groove portion of the processing tool 1 and the processing tool 2 and both surfaces of the plate-like body have chamfers, so pressure contact sliding in the reciprocating direction is possible and the working efficiency is good.
[0057] When completing the forming of paper cardboard, if the pressure contact sliding or pressure contact rolling with the processing tool is carried out in several steps, the deformation resistance per time is small, and since the contact area between the processing tool and the cardboard is small, the frictional resistance is also small. Therefore, it can be formed with a small operating force, so processing by manual operation is easy.
[0058] In the portion where the processing tool contacts the cardboard, two types of forces, the force pushing in the direction from the bottom surface of the notch groove portion to the opening portion and the force pushing in the sliding direction, contribute to the forming. However, since the directions of the forces are different by 90° and the forces are dispersed, the cardboard is less likely to be crushed during forming, and defects such as "wrinkles" are less likely to occur in the vicinity of the forming site.
[0059] On the bottom surface of the notch groove portion, flat portions 1h and 2h that contact the end portion of the paper cardboard are provided by 0.5 to 1.0T with respect to the thickness T of the cardboard, and after the forming is completed, this portion abuts against the bottom surface of the processing tool and the contact area increases. For this reason, compared with during the forming process, after the forming is completed, the deformation resistance of the forming site becomes larger, and even when too much force is applied during manual operation, the cardboard is less likely to be crushed, and defects such as "wrinkles" are less likely to occur in the vicinity of the forming site.
[0060] During processing, it is desirable that the center line of the groove cross-section of the processing tool (the cross-section center line in FIGS. 1(E) and 2(E)) be held perpendicular to the thickness direction of the cardboard. However, it is assumed that it will tilt slightly due to hand tremors during manual operation. Even in this case, since there is an opening angle at the upper part of the notch groove, only the arc part of the bottom surface of the notch groove or the rounded part of the substantially W-shaped bottom contacts the cardboard, and it is easy to keep the flat parts at both ends of the notch groove from contacting the cardboard. Therefore, it is possible to prevent the rubbing marks of the processing tool from appearing in places other than the forming part.
[0061] In processing tools 2 and 3, the notch groove has a substantially W-shaped bottom surface with rounded corners, thereby realizing a forming form in which the end cross-section of the cardboard is bent at both corners at right angles and butted against each other at the center. As a means for realizing this shape, it can be easily assumed that the shape of the bottom surface of the notch groove is replaced with a horizontal line with rounded corners. However, in this case, while the notch groove of the processing tool is in contact with the cardboard, both corners of the cardboard after forming are bent at right angles. However, when the processing tool is separated, due to the springback of the folded part, the folded part becomes an obtuse angle. The substantially W-shaped is effective for preventing this. When bending both corners of the cardboard, the central raised part is used to bend it at an acute angle in anticipation of the springback of the folded part, so that both corners of the cardboard after forming become right angles after the processing tool is separated.
Industrial Applicability
[0062] The present invention can be used to provide a paper cardboard that is excellent in eliminating the worry of cutting fingers at the corners, improving the appearance, and facilitating end adhesion at the end of the cardboard. Since no auxiliary materials other than cardboard and power such as power are required, it can also contribute to cost reduction.
Explanation of Signs
[0063] 1, 2, 3, 9, 10 Processing tools 1a Arc shape of the bottom surface of the notch groove cross-section 1c Contact points between the arc shape of the bottom surface of the notch groove cross-section and the two straight lines at both ends 1d, 2d, 3d Two straight lines from the opening to the bottom surface of the notch groove cross-section 1e, 2e, 3e Distance between contact points of the curve and the straight line on the bottom surface of the notch groove cross-section 1f, 2f, 3f Opening angle of the two straight lines tangent to the curve on the bottom surface of the notch groove cross-section 1g, 2g Thickness of the plate-like body 1h, 2h Width length of the flat part that abuts against the end of the cardboard on the bottom surface of the notch groove cross-section 1j, 2j Chamfering formed by the inner wall surface of the notch groove and the surface of the small opening part and / or both surfaces of the plate-like body 1k, 2k Depth from the deepest part of the bottom surface of the notch groove cross-section to the surface of the small opening part of the plate-like body 1m, 2m, 3m Spacing dimension between the two inner wall surfaces that form the notch groove and face each other 1s Rounded corner part that is a part of the chamfering 1j 2a, 3a Rounding at both ends of the substantially W-shaped bottom surface of the notch groove cross-section 2b, 3b Rounding of the central raised part of the substantially W-shaped bottom surface of the notch groove cross-section 2c, 3c Contact points between the rounding at both ends of the substantially W-shaped bottom surface of the notch groove cross-section and the two straight lines at both ends 2n, 3n Height difference between the central raised part and the valleys at both ends of the substantially W-shaped bottom surface of the notch groove cross-section 2s Rounded corner part that is a part of the chamfering 2j 3p Disk-shaped plate body 3q Support part 3r Pin 3j Chamfering formed by the inner wall surface of the notch groove and the outer peripheral surface of the disk-shaped plate body 3k Depth from the deepest part of the bottom surface of the notch groove cross-section to the outer peripheral surface of the disk-shaped plate body 4, 5, 6, 7 Cardboard before processing 4a, 4b, 4c, 5a, 6a, 7a, 8a Processed cardboard 4x, 8x Processed completion part 4y, 8y In-process part 4z, 8z Unprocessed part 9a, 10a Wrinkles caused by the crushing of the cardboard F pressing force
Claims
1. In a processing tool for cardboard, in which a notch groove portion is provided in the mouth portion of a plate-shaped body having a plate thickness of 2 to 3T with respect to the thickness T of the cardboard whose end is to be processed, in the same direction as the plate thickness direction, the notch groove portion has a bottom surface with an arc shape, and its upper portion is open to the surface of the mouth portion, and has a U-shaped cross section, and further, the U-shaped notch groove portion has, (1) an arc radius of the bottom surface of the cross section thereof is 0.5 to 0.6T. (2) a depth from the bottom surface of the cross section to the surface of the mouth portion is 0.8 to 1.5T. (3) an opening angle between two straight lines in contact with both ends of the arc of the bottom surface of the cross section is 5 to 10°. (4) a chamfer formed by the inner wall surface and the surface of the mouth portion and / or both surfaces of the plate-shaped body has a radius of 0.5 to 1.0T. (5) a pressure contact sliding portion composed of a flat portion (width length 0.5 to 1.0T) and a rounded portion (chamfer radius 0.5 to 1.0T) for contacting the end of the cardboard is provided on the bottom surface of the notch groove portion. Furthermore (6) a separation dimension between two inner wall surfaces facing each other and forming the notch groove portion is 1.0 to 1.2T. A processing tool for cardboard, characterized by comprising at least the above components.
2. In a processing tool for cardboard, in which a notch groove portion is provided in the mouth portion of a plate-shaped body having a plate thickness of 2 to 3T with respect to the thickness T of the cardboard whose end is to be processed, in the same direction as the plate thickness direction, the notch groove portion has a bottom surface with a substantially W shape rounded at the corners, and its upper portion is open to the surface of the mouth portion, and further, the substantially W-shaped notch groove portion has, (1) a radius of rounding at both ends of the substantially W shape of the bottom surface of the cross section thereof is 0.1 to 0.2T. (2) a radius of rounding of the central raised portion of the substantially W shape of the bottom surface of the cross section is 0.1 to 0.5T. (3) a height difference between the central raised portion and both end valleys of the substantially W shape of the bottom surface of the cross section is 0.05 to 0.16T. (4) a distance between contact points of the rounding at both ends of the substantially W shape of the bottom surface of the cross section and the two straight lines at both ends is 1.0 to 1.1T. (5) a depth from the deepest part of the bottom surface of the cross section to the surface of the mouth portion is 0.8 to 1.5T. (6) an opening angle between two straight lines in contact with the rounding at both ends of the substantially W shape of the bottom surface of the cross section is 5 to 10°. (7) a chamfer formed by the inner wall surface and the surface of the mouth portion and / or both surfaces of the plate-shaped body has a radius of 0.5 to 1.0T. (8) On the bottom surface of the notch groove portion, there is provided a pressure contact sliding portion composed of a flat portion (width length: 0.5 to 1.0T) and a rounded corner portion (rounding radius: 0.5 to 1.0T) that abuts against the end portion of the cardboard. Furthermore (9) The separation dimension between the two inner wall surfaces that face each other and form the notch groove portion is 1.0 to 1.2T. A processing tool for cardboard, characterized by comprising at least the above components.
3. In a processing tool for cardboard, a notch groove portion is provided along the circumferential direction on the outer peripheral surface of a disk-shaped plate body having a plate thickness of 2 to 3T with respect to the thickness T of the cardboard whose end portion is processed, and the disk-shaped plate body is axially attached and configured to be rotatable. The notch groove portion has a substantially W-shaped bottom surface with rounded corners, and its upper portion opens to the outer peripheral surface of the disk-shaped plate body. Furthermore, the substantially W-shaped notch groove portion (1) The radius of the roundness at both ends of the substantially W-shaped bottom surface in its cross-section is 0.1 to 0.2T. (2) The radius of the roundness of the central raised portion of the substantially W-shaped bottom surface in its cross-section is 0.1 to 0.5T. (3) The height difference between the central raised portion and the both end valley portions of the substantially W-shaped bottom surface in its cross-section is 0.05 to 0.16T. (4) The distance between the contact points of the roundness at both ends of the substantially W-shaped bottom surface in its cross-section and the two straight lines is 1.0 to 1.1T. (5) The depth from the deepest part of the bottom surface in its cross-section to the surface of the small opening portion is 0.8 to 1.5T. (6) The opening angle between the two straight lines in contact with the roundness at both ends of the substantially W-shaped bottom surface in its cross-section is 5 to 10°. (7) The chamfering formed by its inner wall surface and the surface of the small opening portion and / or both surfaces of the plate-like body has a radius of 0.5 to 1.0T. (8) On the bottom surface of the notch groove portion, an annular contact portion for press-contacting and rolling the end portion of the cardboard is provided. Furthermore (9) The separation dimension between the two inner wall surfaces that face each other and form the notch groove portion is 1.0 to 1.2T. A processing tool for cardboard, characterized by comprising at least the above components.
4. The processing tool for cardboard according to any one of Claims 1, 2, or 3, characterized in that the surface roughness of the inner wall surface of the notch groove portion and the chamfered portion is Ra12.5 (JIS B 0601) or less.
5. Using the processing tool for cardboard according to any one of claims 1, 2, or 3, by pressing and sliding, or pressing and rolling the notch groove portion of the processing tool against the end of the cardboard, a molded product of the cardboard in which the end cross-section of the cardboard is formed into an arc shape, or a shape in which both corner portions are bent at right angles and butted against each other at the center.
6. Using the processing tool for cardboard according to claim 4, by pressing and sliding, or pressing and rolling the notch groove portion of the processing tool against the end of the cardboard, a molded product of the cardboard in which the end cross-section of the cardboard is formed into an arc shape, or a shape in which both corner portions are bent at right angles and butted against each other at the center.
7. Using the processing tool for cardboard according to any one of claims 1, 2, or 3, by pressing and sliding, or pressing and rolling the notch groove portion of the processing tool against the end of the cardboard, a method for molding cardboard in which the end cross-section of the cardboard is formed into an arc shape, or a shape in which both corner portions are bent at right angles and butted against each other at the center.
8. Using the processing tool for cardboard according to claim 4, by pressing and sliding, or pressing and rolling the notch groove portion of the processing tool against the end of the cardboard, a method for molding the cardboard in which the end cross-section of the cardboard is formed into an arc shape, or a shape in which both corner portions are bent at right angles and butted against each other at the center.
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