Method for forming creases on a hollow plate made of synthetic resin and creasing blade

Abstract

The present invention provides a method and a creasing blade for forming creasing lines, which prevent the hollow portion from restoring to its original state and maintain the compressed deformation of the creasing line portion, even when the sealing of the hollow portion is released and the pressure of the creasing blade is released, thereby enabling bending. [Solution] A projection provided at the tip of the creasing blade penetrates at least the back plate that seals the hollow section, releasing the seal on the hollow section, making it possible to maintain the creasing even when the pressure of the creasing blade is released.

Description

Technical Field

[0001] The present invention relates to a ruled line forming method for making a synthetic resin hollow plate, which is formed by laminating and fixing a synthetic resin liner plate and a back plate on the front and back surfaces of a synthetic resin hollow structure in which a large number of hollow parts (bubble parts) with at least one end open in the thickness direction are arranged to seal (seal) the hollow parts, so that it can be bent at the bending part, and also relates to a ruled line blade used when forming the ruled line.

Background Art

[0002] For example, as shown in Patent Document 1, a synthetic resin hollow plate is proposed in which a synthetic resin liner plate and a back plate are laminated and fixed on the front and back surfaces of a synthetic resin hollow structure (bubble structure) in which a large number of hollow parts with the top surface side closed and the base surface side open in the thickness direction are independently arranged to seal the hollow parts.

[0003] The synthetic resin hollow plate has characteristics such as high bending strength, excellent compression resistance, lightweight while having high strength, and excellent heat insulation and sound absorption properties due to the air sealed in the hollow parts. Therefore, it can be used as products such as packaging cases, wall panels, and heat insulation plates used when transporting goods, etc.

[0004] When manufacturing a product material plate corresponding to the developed shape of the above product from a synthetic resin hollow plate, it is punched and cut into the product developed shape by a punching blade of a punching die, and at the same time, a ruled line is formed by a ruled line blade to make the bending part when assembling the product foldable.

[0005] When forming a ruled line on a synthetic resin hollow plate, the ruled line is formed by compressing and deforming the bending part in the thickness direction by a ruled line blade, and when assembling the product, it can be bent at the compressed and deformed part of the ruled line.

[0006] However, when the synthetic resin hollow plate (product material plate) is compressed in the thickness direction by the pressing of the ruled line blade, since each hollow part is independently sealed (closed), the internal air is compressed and deformed along with the pressing.

[0007] Therefore, when the pressure of the scoring blade against the hollow synthetic resin plate (product material plate) is released, the air compression in the hollow section is released, which may make it difficult or impossible to restore the original shape and maintain the compressed deformation state. As a result, it may become impossible to bend the product material plate into the desired shape and manufacture the desired product.

[0008] Furthermore, Patent Document 2 shows a honeycomb-structured synthetic resin hollow structure having a large number of adjacent hollow sections with openings on the front and back sides in the thickness direction, respectively, to which liner plates and back plates are fixed to the front and back sides to seal the hollow sections.

[0009] Even when using a honeycomb-structured hollow sheet of synthetic resin to punch out product material sheets, it was difficult or impossible to maintain the compressed deformation state of the bent portion when punching out the product material sheet from the hollow sheet of synthetic resin, as described above. [Prior art documents] [Patent Documents]

[0010] [Patent Document 1] Japanese Patent Publication No. 2021-181171 [Patent Document 2] Japanese Patent Publication No. 2018-96036 [Overview of the Initiative] [Problems that the invention aims to solve]

[0011] The problem to be solved is that when a die-cutting die is used to punch out a desired product material sheet from a hollow sheet of synthetic resin, the folding points are compressed and deformed to form a creasing line. However, even when a creasing blade is pressed against the sealed hollow part, only the air inside the hollow part is compressed and deformed. When the pressure from the creasing blade is released, the hollow part returns to its original state and can no longer maintain the compressed and deformed state, making folding at the creasing line point difficult or impossible. [Means for solving the problem]

[0012] The present invention relates to a hollow structure made of synthetic resin, having a plurality of hollow sections arranged in a row, each open on at least one side in the thickness direction. Front and back A synthetic resin liner plate and back plate are fixed to a synthetic resin hollow plate to seal the hollow part, and then a die is used to punch out the material. Cutting blade When pressing and forming the product material sheet, the bent portion of the product material sheet A die-cutting scribing blade is pressed against it. Compression deformation By doing so In a method for forming creases that make a device foldable, When punching out product material sheets with a cutting blade, a scoring blade The most important feature is that the protrusion provided therein penetrates at least the back plate that seals the hollow portion, thereby enabling the seal to be released. [Effects of the Invention]

[0013] In this invention, when punching out a product material plate of a desired unfolded shape from a hollow synthetic resin plate using a punching die and compressing and deforming the bending portion to form a creasing line, even if the pressure of the creasing blade is released by releasing the seal of the hollow portion, the hollow portion can be prevented from returning to its original state, maintaining the compressed and deformed state of the creasing portion and enabling bending. [Brief explanation of the drawing]

[0014] [Figure 1] This is a partially broken, approximate perspective view showing the general structure of a hollow plate made of synthetic resin. [Figure 2] This is a longitudinal cross-sectional view of the hollow portion of a hollow plate made of synthetic resin. [Figure 3] This is a simplified front view of a punched-out type. [Figure 4] This is a simplified perspective view of a ruled blade. [Figure 5] This is a longitudinal cross-sectional view along line AA in Figure 4. [Figure 6] This is an explanatory diagram showing the formation state of grid lines. [Figure 7] This is an explanatory diagram showing the state of the product material sheet when it is folded along the marked lines. [Figure 8] This is a partially fractured, approximate perspective view showing an example of a modified hollow sheet made of synthetic resin. [Figure 9] It is an explanatory drawing showing the state when the product material plate is bent along the ruled lines.

Embodiments for Carrying Out the Invention

[0015] Hereinafter, the present invention will be described with reference to the drawings showing embodiments. First, regarding the synthetic resin hollow plate to be punched in the present invention, as shown in FIGS. 1 and 2, the synthetic resin hollow plate 1 has a synthetic resin hollow structure in which a large number of cup-shaped hollow portions 3a with the top surface side in the thickness direction closed and the base end side open are arranged independently in the column direction and the row direction. A thick synthetic resin liner plate 5 and a back plate 7 are fixed to the entire front and back surfaces of the hollow sheet 3 by heat welding or hot melt adhesion or the like in a laminated state.

[0016] The hollow portions 3a arranged in the hollow sheet 3 are sealed (closed) by the laminated and fixed liner plate 5 and back plate 7. Note that the cross section of the hollow sheet 3 is shown by a thick solid line.

[0017] The resin materials of the hollow sheet 3, the liner plate 5, and the back plate 7 are not particularly limited, and any of polyolefin resins, polystyrene resins, polyester resins, polyamide resins, etc. may be used. By using these as the same synthetic resin, the recycling efficiency at the time of disposal can be increased.

[0018] Next, an outline of a punching die 11 for punching and forming a product material plate 9 corresponding to the developed shape of various products such as envelopes, wall panels, heat insulating plates, etc., which is manufactured by bending each side from the above-described synthetic resin hollow plate 1, will be described. The punching die 11 is a conventionally known one for punching a paper cardboard plate, a synthetic resin cardboard plate, a synthetic resin plate (sheet), etc. into a required product developed shape, and the detailed description of the details will be omitted.

[0019] As shown in Figures 3 to 5, the die 11 is positioned to match the unfolded shape of the product and is provided with a die 13 for punching out the product material plate 9 from the hollow synthetic resin plate 1, and a scoring blade 15 which is positioned at the bending point of the product material plate 9 and forms a scoring line that compresses and deforms that point in the thickness direction, making it bendable.

[0020] The scoring blade 15 described above is constructed by fixing a piercing blade 17, whose tip is at least high (length) to penetrate the back plate 7 and enter the hollow portion 3a of the molded resin hollow plate 1 (product material plate 9) to break the sealing state, or to the same height (length) as the punching blade 13 and to reach the liner plate 5, and compression blades 19, whose tips are at a height (length) that reaches the top surface of the hollow portion 3a, on both sides of the piercing blade 17. The piercing blade 17 and the compression blade 19 may be separate or integrated. Figures 3 to 5 show a scoring blade 15 in which the piercing blade 17 and the compression blade 19 are formed separately.

[0021] The tip of the piercing blade 17 is integrally provided with numerous tooth-shaped, needle-shaped, saw-tooth-shaped, or other protrusions 17a in the longitudinal direction, spaced at intervals of at least 1 / 2 of the arrangement width of the hollow portions 3a in the row or column direction of the product material plate 9.

[0022] The compression blade 19 has a thickness corresponding to the thickness of the hollow synthetic resin plate 1 (product material plate 9) on which the creasing lines are formed. For example, it is set to be narrow for thin hollow synthetic resin plates 1 (product material plate 9) and wide for thick hollow synthetic resin plates 1 (product material plate 9).

[0023] The compression blades 19 may be prepared in thicknesses corresponding to the thickness of the hollow synthetic resin plate 1 (product material plate 9), or they may be made into thin compression blades 19 according to the minimum thickness of the hollow synthetic resin plate 1 (product material plate 9), and these compression blades 19 may be stacked in a number corresponding to the thickness of the hollow synthetic resin plate 1 (product material plate 9).

[0024] In the product material plate 9 punched out from the synthetic resin hollow plate 1 by the punching die 11 described above, water is prevented from entering the gaps between the hollow portions 3a by filling and sealing each end face of the hollow sheet 3 with a thermoplastic adhesive (not shown), such as hot melt adhesive.

[0025] Next, the method for forming creasing lines on a hollow plate 1 made of synthetic resin using the creasing blade 15 described above, and the operation of the creasing blade will be explained.

[0026] As shown in Figure 6, the base plate 21 on which the punching die 11 is set is moved toward the faceplate 23 on which the hollow synthetic resin plate 1 is placed. The cutting edge of the punching blade 13, which penetrates the hollow synthetic resin plate 1, is pressed against the faceplate 23, and the scoring blade 15 is pressed against the bent portion of the product material plate 9 to compress and deform it. This punches out the product material plate 9 from the hollow synthetic resin plate 1.

[0027] When forming creasing lines on the product material plate 9, the projection 17a of the piercing blade 17 of the creasing blade 15 penetrates the back plate 7 of the product material plate 9 and then enters at least into the hollow portion 3a, releasing the seal (seal) of the hollow portion 3a and allowing the air inside the hollow portion 3a to be discharged to the outside.

[0028] Furthermore, the piercing blade 17 may be extended so that the projection 17a penetrates into the hollow portion 3a and then reaches the liner plate 5. In this case, perforated cuts will be formed in the liner plate 5, and these perforated cuts will facilitate the bending of the product material plate 9.

[0029] Furthermore, the compression blades 19 of the scoring blade 15 press against the back plate 7 and the hollow sheet 3, including the hollow portion 3a, located on both sides of the piercing blade 17, causing them to compress and deform into a concave shape. The width of the compression deformation formed on both sides of the piercing blade 17 by the compression blades 19 needs to be adjusted according to the thickness of the product material plate 9.

[0030] In other words, when the thickness of the product material plate 9 is thin, the compression deformation width needs to be narrow, and conversely, when it is thick, the compression deformation width needs to be wide. Specifically, various thicknesses of compression blades 19 corresponding to the thickness of the product material plate 9 can be prepared in advance and fixed to both sides of the piercing blade 17, or, for example, many compression blades 19 of a thickness corresponding to a thin product material plate 9 can be prepared and the number of overlapping compression blades 19 can be adjusted according to the thickness of the product material plate 9 to accommodate the thickness of the product material plate 9.

[0031] To form a product from the product material plate 9 removed from the surface plate 23 after the surface plate 21 has been returned to its original position, the product material plate 9 is bent along the score line (compression deformation area). At this time, as shown in Figure 7, the seal of the hollow portion 3a is released and both sides of the piercing blade 17 are compressed and deformed into a concave shape, so when the product material plate 9 is bent, the air inside the hollow portion 3a is expelled and deformed. Therefore, it is possible to avoid the situation in the conventional method where the compression deformation state is restored and bending becomes difficult.

[0032] [Examples of modifications to hollow sheets made of synthetic resin] As shown in Figure 8, the hollow plate 31 made of synthetic resin may be a structure in which a honeycomb structure 33 is formed by continuously attaching a liner plate 35 and a back plate 37 to the upper and lower surfaces of a honeycomb structure 33, which is a hollow structure made of synthetic resin in which a large number of honeycomb-shaped hollow portions 33a with open upper and lower ends in the thickness direction are formed, thereby sealing the hollow portions.

[0033] Even with the synthetic resin hollow plate 31, when the product material plate 9 is punched out, as shown in Figure 9, the projection 17a of the piercing blade 17 is pierced into at least the back plate 37 to release the seal of the hollow portion 33a in the honeycomb structure 33, making the bending edge bendable.

[0034] The above description assumes a configuration in which compression blades 19 are provided integrally or separately on both sides of the piercing blade 17. However, in the present invention, it is also possible to construct the scoring blade 15 using only a piercing blade 17 with a projection 17a at its tip. [Explanation of symbols]

[0035] 1. Hollow plate made of synthetic resin 3. Hollow sheets as hollow structures made of synthetic resin 3a Hollow part 5 Liner plate 7 Backboard 9. Product material board 11 punching dies 13 punching blades 15 ruled blade 17 stabbing blade 17a Protrusion 19 Compression blade 21 Surface plate 23 sided board 31. Hollow plate made of synthetic resin 33 Honeycomb structure as a hollow structure made of synthetic resin 33a Hollow part 35 Liner plate 37 Backboard

Claims

1. In a method for forming a creasing line on a hollow synthetic resin sheet, which is formed by pressing a cutting blade of a punching die against a hollow synthetic resin sheet, which is formed by pressing a creasing blade of a punching die against a hollow synthetic resin sheet, in which a number of hollow sections arranged in a hollow synthetic resin structure having at least one opening in the thickness direction is fixed to the front and back surfaces of the hollow sections to seal the hollow sections, the creasing line on the product material sheet is pressed against the bending portion of the sheet to compress and deform it, thereby making it bendable, A method for forming creases on a hollow sheet of synthetic resin, characterized in that, when punching out a product material sheet with a cutting blade, a projection provided on the creasing blade penetrates at least the backing plate that seals the hollow portion, thereby enabling the seal to be released.

2. In claim 1, The above-mentioned hollow structure made of synthetic resin is a hollow sheet having a number of cup-shaped hollow sections arranged on either the liner plate side or the back plate side. This is a method for forming creases on a hollow sheet made of synthetic resin.

3. In claim 1, The above-mentioned hollow structure made of synthetic resin is a honeycomb structure in which numerous hollow sections of polygonal prism shape, with both ends in the thickness direction open, are formed adjacent to each other. This is a method for forming creases on a hollow plate made of synthetic resin.

4. In Claim 1, The above-mentioned hollow structure made of synthetic resin, liner plate, and back plate are made of the same synthetic resin, and the method for forming creases in a hollow plate made of synthetic resin.

5. In Claim 1, A method for forming creases in a hollow plate made of synthetic resin, wherein the projection of the creasing blade that penetrates the back plate of the hollow section penetrates the liner plate to form a cut.

6. The scoring blade according to any one of claims 1 to 5 is characterized in that it consists of a piercing blade having a number of protrusions at its tip, spaced apart to correspond to the arrangement of the hollow portion.

7. The piercing blade according to claim 6 is characterized in that it consists of a tooth-shaped, needle-shaped, or saw-tooth-shaped projection.

8. The piercing blade according to claim 6 is characterized in that it is provided with a compression blade on at least one side surface that compresses and deforms the back plate and the hollow structure made of synthetic resin by a width corresponding to the thickness of the hollow structure made of synthetic resin.

9. The piercing blade and compression blade of Claim 8 are characterized in that they are integrally formed.

10. The piercing blade of Claim 8 is characterized in that a compression blade having a thickness corresponding to the thickness of the hollow plate made of synthetic resin is fixed to at least one side surface.

11. The compression blade according to claim 10 is characterized in that a unit compression blade with a plate thickness corresponding to the minimum thickness of the hollow plate made of synthetic resin is stacked and made adjustable in accordance with the thickness of the hollow plate made of synthetic resin.

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