A method for producing composite antioxidant decorative paper

Abstract

The invention discloses a manufacturing method of composite antioxidant decorative paper, which relates to the production technology of antioxidant decorative paper, and comprises the following steps: S01, a paper base layer is conveyed by a symmetrically arranged guide roller group; S02, a bamboo charcoal fiber layer and a glass fiber layer are arranged on the upper surface and the lower surface of the paper base layer, and the bamboo charcoal fiber layer and the glass fiber layer are rollingly connected with a glue coating roller and a glue distribution roller in turn along the conveying direction toward the upper surface and the lower surface, so as to form a bonding surface; S04, as the paper base layer, the bamboo charcoal fiber layer and the glass fiber layer are conveyed, they are pressed together by a V-shaped composite splint. The invention first applies glue by a glue coating roller, and then evenly spreads the glue path formed by the glue coating roller on the bamboo charcoal fiber layer and the glass fiber layer by a glue distribution roller, and finally the center line of the composite antioxidant decorative paper is extended to both sides by the V-shaped composite splint, so as to drive the internal glue from the center position to both sides, so as to ensure that the glue laying surface after pressing is uniform.

Description

Technical Field

[0001] The invention relates to a production technology of antioxidant decorative paper, and in particular to a method for producing composite antioxidant decorative paper. Background Art

[0002] Composite antioxidant decorative paper usually refers to ordinary decorative paper, on the basis of which antioxidants or materials with antioxidant properties are added through composite technology to enhance its antioxidant capacity and durability. Composite antioxidant decorative paper usually refers to ordinary decorative paper, on the basis of which antioxidants or materials with antioxidant properties are added through composite technology to enhance its antioxidant capacity and durability.

[0003] Reference publication (announcement) number: CN117344577A, publication (announcement) date: 2024-01-05, discloses an antioxidant, waterproof and wear-resistant decorative paper and a preparation method thereof. The method comprises: polymerizing sodium carboxymethyl cellulose with acrylate monomers to obtain cellulose-acrylate prepolymer; polymerizing titanium dioxide-acrylate mixture dispersion with cellulose-acrylate prepolymer again to obtain modified polyacrylate composite emulsion; mixing silica template containing carbon-carbon double bonds, polyvinyl pyrrolidone, azobisisobutyronitrile, styrene, divinylbenzene, and trifluoroethyl methacrylate to obtain polymer hollow microspheres after alkali etching; loading the polymer hollow microspheres with styrene, ethylene glycol dimethacrylate and azobisisobutyronitrile to obtain modified polymer composite microsphere dispersion; impregnating the decorative paper with the modified polyacrylate composite emulsion, drying and then coating the modified silica composite microsphere dispersion on both sides, and obtaining the antioxidant, waterproof and wear-resistant decorative paper after thermal initiation reaction.

[0004] And, Publication (Announcement) No.: CN115746734A, Publication (Announcement) Date: 2023-03-07, disclosed is an impact-resistant and highly buffered decorative film and a preparation method thereof, wherein an impact-resistant and highly buffered decorative film comprises: a plastic decorative layer, a first adhesive layer, an aluminum foil layer, a second adhesive layer, a sponge layer, an adhesive layer and a release paper layer; the plastic decorative layer, the first adhesive layer, the aluminum foil layer, the second adhesive layer, the sponge layer, the adhesive layer and the release paper layer are stacked in sequence; the first adhesive layer bonds the plastic decorative layer and the aluminum foil layer into one; the second adhesive layer bonds the aluminum foil layer and the sponge layer into one; the material of the plastic decorative layer comprises PETG, PP, a compatibilizer, an antioxidant, and a masterbatch; the weight proportions of the above materials are 60-80 parts of PETG, 16-35 parts of PP, 2-3 parts of a compatibilizer, 1-2 parts of an antioxidant, and 1-2 parts of a masterbatch.

[0005] In the prior art including the above two patents, two methods for producing composite antioxidant decorative paper are provided, and the gluing production method provided by CN115746734A is more commonly used because the processing procedures are relatively simple and the stability of the decorative paper structure after production is relatively high. However, the biggest problem of the gluing and bonding production method is the unevenness of the gluing, because the extension direction of the multiple equidistantly arranged glue paths formed by the smearing is uncontrollable when bonding, so there will inevitably be parts where the glue is missing, making it difficult to control the bonding quality. Summary of the invention

[0006] The object of the present invention is to provide a method for producing a composite antioxidant decorative paper, which is used to improve the uniformity of glue coating, thereby avoiding the partial probability of glue missing.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A method for producing a composite antioxidant decorative paper comprises the following steps:

[0009] S01, a paper base layer conveyed by a symmetrically arranged guide roller group;

[0010] S02, regarding the bamboo charcoal fiber layer and the glass fiber layer arranged on the upper surface and the lower surface of the paper base, the bamboo charcoal fiber layer and the glass fiber layer are facing the upper surface and the lower surface, and are sequentially connected with the glue coating roller and the glue distribution roller in a rolling manner along the conveying direction to form a bonding surface;

[0011] S04, conveying the paper base layer, the bamboo charcoal fiber layer and the glass fiber layer and then pressing them together through a V-shaped composite clamping plate;

[0012] S05. The pressed decorative paper is pressed again by negative pressure rollers arranged symmetrically.

[0013] Preferably, a cooling medium is transmitted in the negative pressure roller.

[0014] Preferably, the glue coating roller is composed of an outer rod and an inner lining pipe, the outer wall of the inner lining pipe is provided with a glue guide channel, the outer rod is provided with a plurality of glue outlet streams arranged in a linear array, and the glue guide channel is connected to the plurality of glue outlet streams.

[0015] Preferably, the colloid guiding channel comprises:

[0016] A plurality of glue introduction channels arranged in a circumferential array along the axis of the lining pipe;

[0017] A plurality of annular glue grooves symmetrically arranged about the center of the glue outlet stream;

[0018] A plurality of the annular glue grooves are connected in parallel with the glue introduction channel.

[0019] Preferably, the width of the annular glue groove is one third of the width of the glue introduction channel.

[0020] Preferably, a mesh ring is fixedly installed in the glue outlet stream, and a chamber is formed between the mesh ring and the inner bottom of the glue outlet stream;

[0021] The periphery of the chamber is in communication with the annular glue grooves on both sides;

[0022] The radius of the mesh holes on the mesh ring member gradually increases from the periphery to the axis center.

[0023] Preferably, the height of the connection point between the chamber and the annular glue groove is less than the height of the axis of the chamber.

[0024] Preferably, the outer sleeve rod is provided with a glue storage compartment symmetrically arranged about the center of the chamber;

[0025] The glue storage cabin is a polygonal structure, with an electric heating ring wire arranged at the center;

[0026] The glue storage cabin is in communication with the annular glue groove, and a glue outlet arranged on the glue storage cabin near the annular glue groove is in communication with the chamber;

[0027] The rubber slurries are symmetrically arranged in the rubber outlet.

[0028] Preferably, the outer surface of the rubber-distributing roller is provided with a plurality of equidistantly arranged airbag protrusions, and the airbag protrusions are divided into a pentagonal supporting base and a circular contact surface according to the structure.

[0029] Preferably, the pressing surface of the V-shaped composite plywood is divided into an inclined surface and a horizontal surface according to the structure, and a V-shaped limiting rib is arranged on the pressing surface, and the V-shaped limiting rib is divided into a V-shaped cutting portion, an inclined portion and a horizontal portion according to the structure, the flat portion is located on the horizontal plane, and the V-shaped cutting portion and the inclined portion are located on the inclined surface.

[0030] In the above technical scheme, the present invention provides a method for producing a composite antioxidant decorative paper, which has the following beneficial effects: in the embodiment, during the transmission of the bamboo charcoal fiber layer and the glass fiber layer, the glue is first applied by a glue roller, and then the glue path formed by the glue roller on the bamboo charcoal fiber layer and the glass fiber layer is evenly spread by a glue-distributing roller, and then the glue is pressed by two symmetrically arranged V-shaped composite plywoods as the transmission continues. The apex of the V-shaped composite plywood in the embodiment is opposite to the transmission direction, so during the transmission process, due to the structure of the V-shaped composite plywood, the center line of the composite antioxidant decorative paper is extended to both sides, thereby driving the internal glue from the center position to both sides, thereby squeezing the glue evenly applied by the glue-distributing roller to both sides, thereby ensuring that the glue laying surface after pressing is uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0032] Figure 1 A schematic diagram of an implementation structure provided for an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the structure of a glue coating roller provided in an embodiment of the present invention;

[0034] Figure 3 The embodiment of the present invention provides Figure 2 Schematic diagram of the explosion structure;

[0035] Figure 4 The embodiment of the present invention provides Figure 2 Schematic diagram of the cross-sectional structure;

[0036] Figure 5 A schematic diagram of the structure of a rubber-distributing roller is provided for an embodiment of the present invention;

[0037] Figure 6 A schematic diagram of the structure of a V-shaped composite splint is provided for an embodiment of the present invention;

[0038] Figure 7 A schematic structural diagram of a V-shaped composite splint pressing surface is provided for an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 1. Guide roller group; 2. Glue coating roller; 21. Outer rod; 22. Lining pipe; 23. Glue guide channel; 231. Glue introduction channel; 232. Annular glue groove; 24. Glue outlet; 3. Glue distribution roller; 31. Air bag protrusion; 311. Pentagonal bottom; 312. Circular contact surface; 4. V-shaped composite splint; 41. Inclined surface; 42. Horizontal surface; 43. V-shaped limiting rib; 431. V-shaped cutting part; 432. Inclined part; 433. Horizontal part; 5. Negative pressure roller; 6. Hole ring; 61. Chamber; 7. Glue storage cabin; 71. Electric heating ring wire; 72. Rubber raw material; 100. Paper base layer; 101. Bamboo charcoal fiber layer; 102. Glass fiber layer. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0042] like Figure 1-7 As shown, a method for producing a composite antioxidant decorative paper comprises the following steps:

[0043] S01, a paper base layer 100 conveyed by a symmetrically arranged guide roller group 1;

[0044] S02, regarding the bamboo charcoal fiber layer 101 and the glass fiber layer 102 arranged on the upper surface and the lower surface of the paper base layer 100, the bamboo charcoal fiber layer 101 and the glass fiber layer 102 are facing the upper surface and the lower surface side, and are rollingly connected with the glue coating roller 2 and the glue distribution roller 3 in sequence along the conveying direction to form a bonding surface;

[0045] S04, as the paper base layer 100, the bamboo charcoal fiber layer 101 and the glass fiber layer 102 are conveyed, they are pressed together by the V-shaped composite clamping plate 4;

[0046] S05 , the laminated decorative paper is laminated again by the symmetrically arranged negative pressure rollers 5 .

[0047] Specifically, the glass fiber layer 102 in the embodiment is impregnated with a modified polyacrylate composite emulsion layer. The composite antioxidant decorative paper in the embodiment comprises a paper base layer 100 located in the middle layer, and the bamboo charcoal fiber layer 101 and the glass fiber layer 102 are bonded to the two sides of the paper base layer 100. The V-shaped composite clamping plate 4 is pressed and the negative pressure rollers 5 arranged symmetrically are used for secondary rolling.

[0048] Furthermore, in the embodiment, the negative pressure roller 5 transmits a cooling medium, and the cooling medium can be cooling oil, cold water and coolant, which is supplied by a compressor and a pump, and its purpose is to quickly reduce the temperature of the two sides of the composite antioxidant decorative paper, so that the glue can be solidified. Because the glue rolled by the V-shaped composite clamping plate 4 will be squeezed out from the side edge, and then cooled by the negative pressure roller 5 to be shaped, and then the two sides of the composite antioxidant decorative paper are corrected by the cutting knife, and the cutting knife can be directly set on the composite antioxidant decorative paper transmission line, or it can be directly cut after the winding is completed.

[0049] In the above technology, in the embodiment, during the conveying process of the bamboo charcoal fiber layer 101 and the glass fiber layer 102, the glue is first applied by the glue roller 2, and then the glue path formed by the glue roller 2 on the bamboo charcoal fiber layer 101 and the glass fiber layer 102 is evenly spread by the glue distribution roller 3, and then pressed by two symmetrically arranged V-shaped composite plywoods 4 as the conveying continues. The apex of the V-shaped composite plywood 4 in the embodiment is opposite to the conveying direction, so during the conveying process, due to the structure of the V-shaped composite plywood 4, the center line of the composite antioxidant decorative paper is extended to both sides, thereby driving the internal glue from the center position to both sides, thereby squeezing the glue evenly distributed by the glue distribution roller 3 to both sides, thereby ensuring that the glue laying surface after pressing is uniform.

[0050] As an embodiment further provided by the present invention, the glue coating roller 2 is composed of an outer rod 21 and an inner lining pipe 22 which are plugged together. The outer wall of the inner lining pipe 22 is provided with a glue guide channel 23. The outer rod 21 is provided with a plurality of glue outlet streams 24 arranged in a linear array. The glue guide channel 23 is connected to the plurality of glue outlet streams 24.

[0051] Specifically, the lining pipe 22 in the embodiment is inserted into the opening at one end of the outer rod 21, and then the end of the lining pipe 22 without the shaft rod abuts against the inner end surface of the outer rod 21, and then the end of the lining pipe 22 with the shaft rod and the end of the outer rod 21 with the shaft rod are fixed by bolts respectively. Figure 2 It is knowable.

[0052] Furthermore, the glue coating roller 2 is driven to rotate by the transmitted bamboo charcoal fiber layer 101 and glass fiber layer 102, and the glue is transmitted through the glue guide channel 23 of the lining pipe 22 into the glue outlet stream 24 and fills the entire glue outlet stream 24, thereby leaving a uniform glue path on the bamboo charcoal fiber layer 101 and the glass fiber layer 102.

[0053] As another embodiment further provided by the present invention, the colloid guiding channel 23 includes:

[0054] A plurality of glue introduction channels 231 arranged in a circumferential array along the axis of the lining pipe 22;

[0055] A plurality of annular glue grooves 232 arranged symmetrically about the center of the glue outlet stream 24;

[0056] The plurality of annular glue grooves 232 are connected in parallel with the glue introduction channel 231 .

[0057] Specifically, in the embodiment, Figure 3 It can be seen that the glue introduction channel 231 is arranged in the longitudinal direction, while the annular glue groove 232 is arranged in the transverse direction, and because the width of the annular glue groove 232 is one third of the width of the glue introduction channel 231, when the glue enters the annular glue groove 232 from the glue introduction channel 231, the annular glue groove 232 will be quickly filled.

[0058] The annular glue grooves 232 in the embodiment are grouped into two and are located on both sides of the glue outlet stream 24. Therefore, when injecting, the glue on both sides of the glue outlet stream 24 is relatively full. Therefore, the bamboo charcoal fiber layer 101 and the glass fiber layer 102 transmitted by the glue coating roller 2 are driven to rotate, and the glue enters the glue outlet stream 24 during the transmission through the glue guide channel 23 of the lining pipe 22, and fills the entire glue outlet stream 24, thereby leaving a uniform glue path on the bamboo charcoal fiber layer 101 and the glass fiber layer 102. The two sides of this uniform glue path are higher than the center. The purpose is to prevent excessive glue from overflowing from the side of the composite antioxidant decorative paper during the subsequent pressing action of the V-shaped composite plywood 4, which solves the glue usage to a certain extent and avoids waste.

[0059] As another embodiment further provided by the present invention, a mesh ring 6 is fixedly installed in the glue outlet stream 24, and a chamber 61 is formed between the mesh ring 6 and the inner bottom of the glue outlet stream 24;

[0060] The periphery of the chamber 61 is in communication with the annular rubber grooves 232 on both sides;

[0061] The radius of the mesh holes on the mesh ring member 6 gradually increases from the periphery to the axis.

[0062] Specifically, because the glue is transmitted by the glue introduction channel 231, there will be a certain speed difference between the glue inlet of the glue introduction channel 231 and the other end relative to the glue outlet, which will cause the glue in the annular glue groove 232 to decrease from the glue inlet and the other end relative to the glue outlet. In order to solve this problem, the present embodiment provides a mesh ring member 6, which uses the mesh ring member 6 to limit the glue outlet speed of the glue outlet 24, thereby solving the above-mentioned problem.

[0063] Secondly, the radius of the mesh holes on the mesh ring member 6 in the embodiment gradually increases from the periphery to the axis center, so when the glue enters the chamber 61, it is restricted by the mesh holes, thereby filling the entire chamber 61, so that the glue flowing out of the glue outlet 24 is a uniform glue path. The glue coating roller 2 is driven by the bamboo charcoal fiber layer 101 and the glass fiber layer 102 to rotate, so that a uniform glue path is left on the bamboo charcoal fiber layer 101 and the glass fiber layer 102.

[0064] As another embodiment further provided by the present invention, the height of the connection point between the chamber 61 and the annular adhesive groove 232 is smaller than the height of the axis of the chamber 61 .

[0065] Specifically, the glue in the annular glue groove 232 in the embodiment enters from the bottom of the chamber 61, and when both sides are filled, it begins to extend to the center of the chamber 61. When the glue enters the chamber 61, it is restricted by the mesh, thereby filling the entire chamber 61 so that the filled glue out of the glue outlet 24 is a uniform glue path.

[0066] As another embodiment further provided by the present invention, the outer sleeve rod 21 is provided with a glue storage compartment 7 which is arranged symmetrically with respect to the center of the chamber 61;

[0067] The glue storage cabin 7 is a polygonal structure, and an electric heating ring wire 71 is arranged at the center;

[0068] The glue storage compartment 7 is in communication with the annular glue groove 232, and a glue outlet arranged near the annular glue groove 232 is in communication with the chamber 61;

[0069] The rubber slugs 72 are symmetrically arranged in the rubber outlet.

[0070] Specifically, in the embodiment, the glue in the annular glue groove 232 first enters the glue storage cabin 7, and then the electric heating ring wire 71 in the glue storage cabin 7 is operated, so that the glue inside is kept at a high temperature. The glue enters from the bottom of the chamber 61, so the glue entering the glue storage cabin 7 will flow along the inner wall of the glue storage cabin 7 until the chamber 61 is in the state, and then squeezed into the chamber 61 through the rubber 72, so that the full glue coming out of the glue groove 24 is a uniform glue path. Therefore, when the glue coating roller 2 is driven by the transmitted bamboo charcoal fiber layer 101 and glass fiber layer 102 to rotate, a uniform glue path is left on the bamboo charcoal fiber layer 101 and glass fiber layer 102.

[0071] As another embodiment further provided by the present invention, the outer surface of the rubber-distributing roller 3 is provided with a plurality of equidistantly arranged airbag protrusions 31 , and the airbag protrusions 31 are divided into a pentagonal base 311 and a circular contact surface 312 according to the structure.

[0072] Specifically, the airbag protrusion 31 in the embodiment is divided into a pentagonal base 311 and a circular contact surface 312 according to the structure, and the airbag protrusion 31 is located between every two glue tracks, so when the airbag protrusion 31 contacts the bamboo charcoal fiber layer 101 and the glass fiber layer 102, it will shrink due to the extrusion and thus deform, thereby contacting the glue on the glue tracks on both sides, and under the action of the tension of the liquid, the glue will be extended along the deformed airbag protrusion 31, thereby extending toward between the glue tracks on both sides, thereby achieving full paving.

[0073] As another embodiment further provided by the present invention, the pressing surface of the V-shaped composite plywood 4 is divided into an inclined surface 41 and a horizontal surface 42 according to the structure, and a V-shaped limiting rib 43 is arranged on the pressing surface, and the V-shaped limiting rib 43 is divided into a V-shaped cutting portion 431, an inclined portion 432 and a horizontal portion 433 according to the structure, the horizontal portion 433 is located on the horizontal surface 42, and the V-shaped cutting portion 431 and the inclined portion 432 are located on the inclined surface 41.

[0074] Specifically, the combination of the embodiments Figure 6 and Figure 7As shown, the bamboo charcoal fiber layer 101 and the glass fiber layer 102 enter along the inclined surface 41 during the transmission process, and then the bamboo charcoal fiber layer 101, the glass fiber layer 102 and the paper base layer 100 are bonded together at the horizontal plane 42. During the transmission process, the vertex of the V-shaped cutting portion 431 corresponds to the center line of the composite antioxidant decorative paper, and then as the inclined surface 41 moves toward the horizontal plane 42, the glue between them moves from the center to both sides, and the glue crushed by the inclined portion 432 and the horizontal portion 433 will be squeezed out from the side edges.

[0075] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for producing a composite antioxidant decorative paper, characterized in that: The following steps are involved: S01, a paper base layer (100) conveyed by a symmetrically arranged guide roller group (1); S02, with respect to the bamboo charcoal fiber layer (101) and the glass fiber layer (102) arranged on the upper surface and the lower surface of the paper base layer (100), the bamboo charcoal fiber layer (101) and the glass fiber layer (102) are rollingly connected with the glue coating roller (2) and the glue distribution roller (3) in sequence along the conveying direction, facing the upper surface and the lower surface, so as to form a bonding surface; S04, conveying the paper base layer (100), the bamboo charcoal fiber layer (101), and the glass fiber layer (102) and pressing them together through a V-shaped composite clamping plate (4); S05, the laminated decorative paper is laminated again by means of symmetrically arranged negative pressure rollers (5); The glue coating roller (2) is composed of an outer rod (21) and an inner lining pipe (22) connected by plugging, the outer wall of the inner lining pipe (22) is provided with a glue guide channel (23), the outer rod (21) is provided with a plurality of glue outlet streams (24) arranged in a linear array, and the glue guide channel (23) is connected to the plurality of glue outlet streams (24); The colloid guiding channel (23) comprises: A plurality of glue introduction channels (231) arranged in a circular array along the axis of the lining pipe (22); A plurality of annular glue grooves (232) arranged symmetrically about the center of the glue outlet stream (24); The plurality of annular glue grooves (232) are connected in parallel to the glue introduction channel (231); A mesh ring (6) is fixedly installed in the glue outlet stream (24), and a chamber (61) is formed between the mesh ring (6) and the inner bottom of the glue outlet stream (24); The periphery of the chamber (61) is in communication with the annular glue grooves (232) on both sides; The radius of the mesh holes on the mesh ring (6) gradually increases from the periphery to the axis; The outer sleeve rod (21) is provided with a glue storage compartment (7) which is arranged symmetrically with respect to the center of the chamber (61); The glue storage cabin (7) is a polygonal structure, with an electric heating ring wire (71) arranged at the center; The glue storage cabin (7) is in communication with the annular glue groove (232), and a glue outlet arranged on the storage cabin near the annular glue groove (232) is in communication with the chamber (61); The rubber outlet is symmetrically provided with rubber raw materials (72) that are bonded together.

2. The method for producing a composite antioxidant decorative paper according to claim 1, characterized in that: A cooling medium is transmitted inside the negative pressure roller (5).

3. The method for producing composite antioxidant decorative paper according to claim 1, characterized in that: The width of the annular glue groove (232) is one third of the width of the glue introduction channel (231).

4. The method for producing composite antioxidant decorative paper according to claim 3, characterized in that: The height of the connection point between the chamber (61) and the annular adhesive groove (232) is smaller than the height of the axis of the chamber (61).

5. The method for producing composite antioxidant decorative paper according to claim 1, characterized in that: The outer surface of the rubber-distributing roller (3) is provided with a plurality of equidistantly arranged airbag protrusions (31), and the airbag protrusions (31) are divided into a pentagonal supporting base (311) and a circular contact surface (312) according to the structure.

6. The method for producing composite antioxidant decorative paper according to claim 1, characterized in that: The pressing surface of the V-shaped composite splint (4) is divided into an inclined surface (41) and a horizontal surface (42) according to the structure, and a V-shaped limiting rib (43) is provided on the pressing surface. The V-shaped limiting rib (43) is divided into a V-shaped cutting portion (431), an inclined portion (432) and a horizontal portion (433) according to the structure. The flat portion (433) is located on the horizontal surface (42), while the V-shaped cutting portion (431) and the inclined portion (432) are located on the inclined surface (41).

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