Coating facility

Abstract

To provide a coating facility capable of appropriately applying an adhesive when providing a tail seal to rolled sanitary paper.SOLUTION: There is provided a coating facility for pressing a tip part of a glue bar provided with an adhesive against a paper log of sanitary paper and provided a tail seal. The glue bar includes an apex part, a bottom part, and a body part for connecting the apex part and the bottom part. The apex part includes a flat tip part and a pair of inclined surfaces connecting the tip part and the body part, which is inclined to expand from the tip part. In a cross section orthogonal to a bar extension direction of the glue bar, the apex part is roughly of an isosceles trapezoid whose upper base is shorter than the lower base. The tip part corresponds to the upper base of the trapezoid, the pair of inclined surfaces corresponds to a pair of legs of the trapezoid, and a boundary part for connecting the apex part and the body part corresponds to the lower base of the trapezoid.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a coating device for tail sealing rolled sanitary paper. [Background technology]

[0002] Conventionally, in rolled sanitary paper (hereinafter simply referred to as "rolled sanitary paper"), which is sanitary paper such as toilet paper, kitchen paper, paper towels, and paper wipes (hereinafter simply referred to as "sanitary paper") wound into a roll, the end of the roll (hereinafter also referred to as the "tail part") is sealed (glued), and a groover, for example, is used to apply the coating to create the seal at the tail part (hereinafter also referred to as the "tail seal").

[0003] Figure 1 shows a cross section perpendicular to the bar extension direction of a conventional groover 80. In coating with a groover 80, the groover 80 is moved up and down in a glue vat, adhesive is placed on the tip 81 of the groover 80, and the tip 81 of the groover 80 is pressed against the tail portion of the paper log of the rolled sanitary paper to apply the adhesive, and the end of the winding end of the paper log of the rolled sanitary paper is overlapped to form a tail seal.

[0004] Here, the tail seal of the rolled sanitary paper is elongated to make it easy to peel off when used, and the tip 81 of the groover 80 needs to be elongated to match the tail seal, but as it moves up and down as described above, the groover 80 needs to be made somewhat thick to give it a certain degree of rigidity so that it does not deform. Taking these factors into consideration, a shoulder 82 is cut to give rigidity to the body of the groover 80, and the tip 81 is made elongated, unlike the body, to allow for the formation of an elongated tail seal. Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the groover 80 shown in Figure 1, adhesive is also applied to the shoulder 82, and the surface tension of the adhesive causes the adhesive to rise and stick to the tip end as well.As a result, when the tail seal is formed, excess adhesive adheres to the roll of sanitary paper, resulting in more adhesive than originally intended being applied to the roll of sanitary paper, or the formation of a tail seal with a larger area than originally intended.As a result, there is a risk that the tail seal cannot be properly removed when the roll of sanitary paper is used.

[0006] An object of the present invention is to provide a coating device that can properly apply adhesive when providing a tail seal to rolled sanitary paper. [Means for solving the problem]

[0007] A first form of coating equipment according to the present invention is coating equipment for pressing the tip of an adhesive-coated groover against a paper log of sanitary paper to create a tail seal, wherein the groover has a top, a bottom, and a body connecting the top and bottom, the top including a flat tip and a pair of inclined surfaces connecting the tip and body and diverging from the tip, and in a cross section perpendicular to the bar extension direction of the groover, the top is an approximately isosceles trapezoid whose upper base is shorter than the lower base, the tip corresponds to the upper base of the trapezoid, the pair of inclined surfaces correspond to a pair of legs of the trapezoid, and the boundary portion connecting the top and body corresponds to the lower base of the trapezoid.

[0008] A second aspect of the coating equipment according to the present invention is the first aspect, characterized in that the tip end has a recess capable of receiving adhesive provided along the bar extension direction. [Effects of the Invention]

[0009] According to the present invention, the cross-sectional shape of the top of the groover, which is perpendicular to the bar extension direction, is provided with an inclined surface that includes a trapezoid, and by minimizing the area on which adhesive is applied other than the tip, it is possible to form a proper tail seal. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view of a conventional groover taken along a line perpendicular to the bar extension direction. [Figure 2] 1 is a schematic perspective view of a roll-type sanitary paper manufacturing device including a coating device according to an embodiment of the present invention. FIG. [Figure 3] 1(a) to 1(d) are schematic side views for explaining a tail sealing process in a coating facility according to one embodiment of the present invention. [Figure 4] 4 is a cross-sectional view of the groover shown in FIG. 3 taken along a line perpendicular to the extending direction of the groover. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the coating equipment according to the present invention will be described in detail with reference to Figures 2 to 4. However, the present invention is not limited to this embodiment.

[0012] In this specification and claims, the term "approximately isosceles trapezoid" refers to an isosceles trapezoid or a shape similar to an isosceles trapezoid. Specifically, the term "approximately isosceles trapezoid" also includes, for example, a trapezoid having curved surfaces where the portions corresponding to the pair of legs of the isosceles trapezoid bulge outward.

[0013] Furthermore, in this specification and claims, "rolled sanitary paper" refers to sanitary paper rolled into a roll, as described above, and "sanitary paper" refers to toilet paper, kitchen paper, paper towels, paper wipes, etc.

[0014] First, a roll-form sanitary paper manufacturing apparatus including a coating facility according to the present invention will be described.

[0015] <Manufacturing equipment> Figure 2 is a schematic oblique view of a roll-type sanitary paper manufacturing device 1 including a coating device 14 according to one embodiment of the present invention, Figure 3 is a schematic side view for explaining the tail sealing process in the coating device according to this embodiment, and Figure 4 is an enlarged side view of the tip of the groover shown in Figure 3.

[0016] As shown in Figure 2, the roll-shaped sanitary paper manufacturing device 1, which includes the coating equipment 14 of this embodiment, manufactures roll-shaped sanitary paper (toilet paper in this embodiment) 3, in which sanitary paper (toilet paper in this embodiment) is wound into a roll.

[0017] The roll-shaped sanitary paper manufacturing apparatus 1 is provided with a paper log producing unit 10 that produces roll-shaped paper logs 5 that are axially longer than the roll-shaped sanitary paper 3 by forming a tail seal at the tail of the paper log 5 in a coating device 14, an adjustment unit 20 that temporarily stores the paper logs 5 produced in the paper log producing unit 10 and adjusts the timing of the paper log 5's delivery, and a cutting unit 30 that cuts both longitudinal ends of the paper logs 5 delivered from the adjustment unit 20 to predetermined dimensions to produce a pair of trims 3T and a plurality of roll-shaped sanitary paper 3. The manufacturing apparatus 1 is further provided with a packaging unit 40 that packages the roll-shaped sanitary paper 3 in predetermined numbers, and a boxing unit 50 that boxes the packages 9 of roll-shaped sanitary paper 3 packaged in the packaging unit 40.

[0018] In this embodiment, in the coating equipment 14, as shown in FIG. 3, the groover 46 is moved up and down, the tip of the groover 46 is dipped into a glue vat (glue tank), and the tip with the adhesive attached is pressed against the surface of the tail portion of the paper log 5 to coat it, and then the end of the paper log 5 is wound up to form the tail portion.

[0019] 3 and 4, the coating equipment according to this embodiment presses the adhesive-coated tip of a groover 46 against a paper log 5 of sanitary paper to form a tail seal. The groover 46 has a top 46T, a bottom (not shown), and a body 46M connecting the top 46T and the bottom. The top 46T includes a flat tip 461 and a pair of inclined surfaces 462 that connect the tip 461 and the body 46M and incline so as to widen from the tip 461. In a cross section perpendicular to the bar extension direction of the groover 46, the top 46T is a substantially isosceles trapezoid whose upper base is shorter than its lower base. The tip 461 corresponds to the upper base of the trapezoid, the pair of inclined surfaces 462 correspond to a pair of legs of the trapezoid, and a boundary portion 463 connecting the top 46T and the body 46M corresponds to the lower base of the trapezoid. Details of the coating process will be described later.

[0020] Hereinafter, upstream and downstream are defined based on the order of the processes performed by each functional unit in the manufacturing apparatus 1. In the roll-shaped sanitary paper manufacturing apparatus 1, a paper log generating unit 10, an adjusting unit 20, a cutting unit 30, a packaging unit 40, and a boxing unit 50 are arranged in this order from upstream to downstream.

[0021] The paper log producing unit 10 unwinds the base paper 11 (material) from a raw roll 12, which is a strip of base paper 11 that is wider than the rolled sanitary paper 3, and rewinds the base paper 11 with a winder 13 to form a paper log 5. The paper log 5 has an axial length equal to the axial length of the raw roll 12 and a diameter equal to the diameter of the product 3.

[0022] In the winder 13, the base paper 11 may be embossed or printed. The base paper roll 12 may be a primary base paper (jumbo roll) on which a single layer (one ply) of base paper 11 made of one sheet of paper material is wound, or a secondary base paper on which multi-layer (two or more plies) base paper 11 made of multiple sheets of paper material is wound.

[0023] The winder 13 cuts the base paper 11 every time it is wound around a cylindrical core 5c (long core tube) by a predetermined length, thereby continuously forming paper logs 5. The base paper 11 is wound from the inner periphery (core 5c side) of the paper log 5 toward the outer periphery (i.e., from the inside to the outside in the radial direction). Then, once a predetermined length of base paper 11 has been wound around the outer periphery of the core 5c, the base paper 11 is cut (divided) along a straight line intersecting the longitudinal direction of the base paper 11, thereby forming the paper log 5. Here, an example is shown in which the base paper 11 is cut along a straight line extending in its width direction (a direction perpendicular to the longitudinal direction).

[0024] As described above, of the base paper 11 that forms the continuous paper log 5, the downstream portion of the straight line becomes the winding end 5a (tail) of one paper log 5, and the upstream portion of the straight line (the portion separated from the winding end 5a) becomes the winding start end 5b of the next log 5.

[0025] As shown in Figures 2 and 3, each paper log 5 has its winding end 5a glued (tail sealed) to its outer surface in the coating equipment 14, which is the final process in the paper log production section 10, and then is sent to the downstream adjustment section 20.

[0026] The adjusting unit 20 stores a plurality of paper logs 5 in an accumulator 21, and sequentially sends out the paper logs 5 to the downstream cutting unit 30. Here, an adjusting unit 20 that sends out two paper logs 5 at a time toward the cutting unit 30 is illustrated as an example.

[0027] The cutting unit 30 cuts the paper logs 5 sent out from the adjusting unit 20 in the axial direction at predetermined intervals using a log saw 31. As a result, each paper log 5 is cut into a plurality of rolls of sanitary paper 3.

[0028] The packaging unit 40 inserts, for example, eight rolls of sanitary paper 3 (four rolls x two rows) into a packing bag 19 and seals the opening 22 of the packing bag 19 to form a package 9.

[0029] The boxing section 50 packs a plurality of (eight, for example) packages 9 as a set (eight sets, for example) into the cardboard box 23. Then, the packages 9 packed in the cardboard box 23 are shipped.

[0030] <Processes in coating equipment> Returning to FIG. 3, in the coating equipment 14 according to this embodiment, first, the paper log 5 after winding is moved to the tail sealing device (see the direction A in FIG. 3(a)), and is arranged so as to be sandwiched between the upper receiving roll 41 and the lower receiving roll 42. Air is sprayed from the air spraying unit 43 while rotating the paper log 5 to spread the tail (end of winding) (see FIG. 3(b)). Then, a photoelectric switch 44 consisting of a light emitting unit 44a and a light receiving unit 44b detects the tail of the paper log 5. When this is detected, the photoelectric switch 44 is activated and the tail of the paper log 5 is pulled back for a certain period of time (see Figure 3(c)). After this, the lower receiving roll 42 rotates in the reverse direction, the tail of the paper log 5 is fixed with a vacuum (not shown), and it is pulled out again (see Figure 3(d)). The paper log 5 is then discharged. The groover 46 is then raised from the glue vat (see direction B in Figure 3(d)). Glue is applied to the roll surface of the paper log 5, and the tail is stuck to it, and the paper log 5 is produced.

[0031] 4(a), as described above, the groover 46 has a top 46T, a bottom (not shown), and a body 46M connecting the top 46T and the bottom. The top 46T includes a flat tip 461 and a pair of inclined surfaces 462 that connect the tip 461 and the body 46M and incline so as to widen from the tip 461. In a cross section perpendicular to the bar extension direction of the groover 46, the top 46T is configured as a substantially isosceles trapezoid whose upper base is shorter than its lower base. The tip 461 corresponds to the upper base of the trapezoid, the pair of inclined surfaces 462 correspond to a pair of legs of the trapezoid, and a boundary portion 463 connecting the top 46T and the body 46M corresponds to the lower base of the trapezoid. In this embodiment, the bottom is not shown, but may be rectangular in shape when viewed from the side.

[0032] With this configuration, the cross-sectional shape of the top 46T of the groover 46, which is perpendicular to the bar extension direction, is formed by providing an inclined surface 462 so as to include a trapezoid, and by minimizing the area on which adhesive is applied other than the tip 461, it is possible to form a proper tail seal.

[0033] 4(b) shows a modified example of a groover 46' of a coating equipment according to an embodiment of the present invention. Of the elements constituting the groover 46' of a coating equipment according to this embodiment, those having similar functions are assigned the same reference numerals as in the first embodiment, and descriptions thereof will be omitted.

[0034] In a modification of this embodiment, a recess 464 capable of receiving adhesive is provided along the bar extension direction in the tip portion 461. With this configuration, the recess 464 can receive adhesive, so that a larger amount of adhesive can be applied to the roll surface of the paper log 5 within the narrow area of the tip portion 461.

[0035] In order to achieve the effects of the present invention, it is preferable that the width d1 of the groover 46 (i.e., the length d1 of the lower base (boundary portion 463) of the trapezoid of the top portion 46T shown in FIG. 4(a)) be 3.0 mm to 6.0 mm, the width d2 of the tip portion 461 of the groover 46 (i.e., the length d2 of the upper base of the trapezoid of the top portion 46T shown in FIG. 4(a)) be 0.5 mm to 3.0 mm, and the height h of the top portion 46T of the groover 46 (i.e., the height h of the trapezoid of the top portion 46T shown in FIG. 4(a)) be 1 mm to 4 mm, and more preferably 2 mm to 4 mm. Furthermore, in order to achieve the effects of the present invention, it is preferable that the groove depth of the recess 464 formed in the tip portion 461 of the groover 46 be 0.3 mm to 1.1 mm.

[0036] Groovers 46 with a wider width d2 (approximately 2.0 mm to 3.0 mm) are used when adding width to the sealed portion, and can be used for kitchen towels, while groovers with a narrower width d2 (approximately 0.5 mm to 1.5 mm) are used when narrowing the sealed portion, and can be used for toilet paper rolls. However, even within the same type of product, there are differences in specifications (for example, 1-ply and 2-ply, or differences in basis weight), so they can be used for further differentiation.

[0037] Groovers 46' with recesses 464 having a deep groove depth (approximately 0.8 mm to 1.1 mm) are used when a wider seal is required, and are suitable for use in kitchen towels, while grooves 464 with a shallow groove depth (approximately 0.3 mm to 0.6 mm) are used when a narrower seal is required, and are suitable for use in toilet paper. However, even within the same type of product, there are differences in specifications (for example, 1-ply and 2-ply, or differences in basis weight), which allows for further differentiation.

[0038] If the width d2 is less than 0.5 mm, the seal width will be narrow (the seal width will be insufficient), and in the case of kitchen towels, because they have more stiffness (rigidity) than toilet rolls, there is a possibility that the tail will peel off before use or the roll will become loose. On the other hand, if the width d2 is greater than 3.0 mm, the seal width will be wide (too much glue will be attached), and in the case of toilet rolls, the tail will be difficult to peel off when used or the lower layer (the inner layer of the roll) may tear along with it.

[0039] The present invention is not limited to the above-described embodiment or the modifications described throughout, and appropriate changes and modifications can be made without departing from the technical concept of the present invention. [Explanation of symbols]

[0040] 1. Sanitary paper roll manufacturing equipment 3. Sanitary paper rolls 5. Paper Log 5a End of winding 5b Starting end of winding 5c Core 10 Paper Log Generation Unit 11 Base paper (materials) 12 Raw roll 13 Winder 14 Coating equipment 41 Upper support roll 42 Lower support roll 43 Air injection unit 44 Photoelectric switch 44a Light projector 44b Light receiving part 45 Glue tray 46, 46' Gruber 46T top 461 Tip 462 Slope 463 Boundary part 464 recess 46M Torso 20 Adjustment part 21 Accumulator 30 Cutting section 31 Log saw 40 Packaging Department 50 Packing Department

Claims

1. A coating device for pressing a tip of a groover to which adhesive is applied against a paper log of sanitary paper to form a tail seal, The groover has a top portion, a bottom portion, and a body portion connecting the top portion and the bottom portion, the top portion includes a flat tip portion and a pair of inclined surfaces that connect the tip portion and the body portion and are inclined so as to widen from the tip portion, In a cross section perpendicular to the bar extension direction of the groover, the top portion has a substantially isosceles trapezoidal shape with an upper base shorter than a lower base, the tip portion corresponds to the upper base of the trapezoid, the pair of inclined surfaces correspond to a pair of legs of the trapezoid, and a boundary portion connecting the top portion and the body portion corresponds to the lower base of the trapezoid.

2. 2. The coating equipment according to claim 1, wherein the tip portion is provided with a recess that is capable of receiving adhesive and that extends in the direction in which the bar extends.

Images