JPWO2007055195A1 - Welding flat brush, spiral cylindrical brush, and manufacturing method thereof - Google Patents

Abstract

All-resin brushes that do not use metal can be easily manufactured without stacking, and the diameter of the center hole, the density of the thread material at the brush section, the thread length, etc. can be easily changed, and mass production is possible. A cylindrical brush having a configuration capable of reducing the manufacturing cost is provided. In order to realize this, a welding fixed type flat brush in which a large number of meltable thread members 11 constituting the brush spread laterally and are arranged in a brush shape, and each thread member 11 is integrated by welding on one end side. Make 10. The flat brush 10 is spirally wound with the belt-like welded portion 13 formed on the fixed side facing inside, whereby a spiral cylindrical brush 20 is produced.

Description

  The present invention relates to a flat brush used for a toothbrush and various industrial brushes, a cylindrical brush using the flat brush, and a method for producing them.

  One type of industrial brush is a cylindrical brush. This has a structure in which a large number of thread members protrude radially from a rod-shaped or cylindrical core, and the structure is classified into the following four types according to the manufacturing method.

  The first is a flocking type in which a plurality of small yarn bundles formed by bundling resin yarns are implanted on the entire circumference and the entire length on the outer peripheral surface of a cylindrical core made of resin. In this cylindrical brush, a plurality of planting holes for thread bundles are provided on the entire outer peripheral surface of the core part. After the individual thread bundles are folded in two at the center and inserted into the flock holes. The individual yarn bundles are fixed to the head portion by driving a metal piece such as brass or aluminum slightly larger than the flock hole from above the bending insertion portion (see Non-Patent Document 1).

  Secondly, a flat brush in which an assembly of a large number of yarn materials arranged side by side is folded in half at the center, a core wire is passed through the inside of the bent portion, and the bent portion is caulked and fixed with a metal hoop from the outside. It is a channel-type cylindrical brush that is wound inside in a spiral shape and welded and fixed at both ends (see Non-Patent Document 2).

  The third is a torsion brush produced by sandwiching an assembly in which a large number of yarn materials are arranged side by side with a plurality of wires and twisting the wires (see Non-Patent Document 3).

  The fourth is a brush head of a toothbrush, in which about 20 to 25 thin nylon circular brushes having a thickness of about 0.5 mm are stacked. The nylon circular brush has an annular welded portion at the center, and a large number of nylon threads protrude radially from the welded portion. A cylindrical toothbrush is formed by stacking about 20 to 25 sheets and fitting them into the tip of the handle, and welding and fixing the tip protrusion of the handle to the handle (see Patent Document 1).

"Brush standard catalog 2006, page 10" Narutoya Co., Ltd. "Brush standard catalog 2006, page 8" Narutoya Co., Ltd. "Brush standard catalog 2006, page 37" Narutoya Co., Ltd. Japanese Patent No. 3646118

  In the first to third cylindrical brushes, even if the thread material is a resin thread such as nylon, since the metal is used for fixing to the core part and the core part, food-related, medical-related, toothbrush In such applications, there was a problem of metal corrosion (rust), and it was difficult to apply. In addition, it is difficult to completely fix the brush portion, which is an aggregate of the thread material, to the core portion, and dropping off of the brush portion has been a problem. Furthermore, since metal is used, there are restrictions on the shape, and there are problems in terms of weight, cost, and recycling.

  On the other hand, although the fourth cylindrical brush is a toothbrush brush head, there is an advantage that metal can be eliminated. However, since the process for manufacturing the nylon circular brush is complicated and it is difficult to automate the operation of stacking the manufactured circular brushes, there are limits to cost reduction and mass production. It was difficult to change the density and thickness of the thread material in the circular brush, the diameter of the central through hole, the material of the thread material, and the like, and there were many problems in use as an industrial brush.

  10 and 11 are explanatory diagrams of a manufacturing process of the cylindrical toothbrush using the fourth cylindrical brush, and FIG. 12 is a front view of the cylindrical brush.

  This cylindrical toothbrush has a cylindrical brush 50 formed by stacking 20 to 25 circular brushes 51 at the distal end of the handle 30. More specifically, the cylindrical brush 50 includes the handle 30. 20 to 25 circular brushes 51 are overlapped and fitted on the small-diameter shaft portion 31. Each circular brush 51 has a thin annular welded portion 52 at its center, and a brush portion 53 formed by radially extending a large number of resin yarns (nylon yarns) from the entire circumference of the welded portion 52. Is a disk type having a welded portion around the periphery. Then, the small diameter shaft portion 31 at the tip of the handle 30 is passed through the center holes of the 20 to 25 circular brushes 51, and the tip of the shaft portion 31 is melted by the high frequency welding horn 60 to increase the diameter. A circular brush 51 is laminated and fixed to the tip of the handle 30 to form a cylindrical brush 50.

  The inner diameter d ′ of the center hole of the circular brush 51, that is, the inner diameter of the cylindrical core portion of the cylindrical brush 50 is determined by the thickness of the bundle of resin yarns used for the circular brush 51 and cannot be arbitrarily changed. The outer diameter D ′ of the annular welded portion 52, that is, the outer diameter of the cylindrical core portion of the cylindrical brush 50 must be increased to some extent due to the manufacturing method of the circular brush 51. For this reason, if the brush diameter is constant, the bristle length h 'in the brush portion 53, that is, the bristle length of the brush portion in the cylindrical brush is limited, and the brush diameter for securing a predetermined bristle length increases.

  That is, the fourth cylindrical brush 50 configured by laminating the circular brushes 51 has a small degree of freedom in design dimensions and design specifications.

  The present invention solves the problems of conventional cylindrical brushes at once, and it is possible to easily manufacture an all-resin brush that does not use metal without stacking work, and further, the hole diameter of the central hole and the yarn in the brush portion. It is an object of the present invention to provide a cylindrical brush having a configuration in which design specifications such as material density and yarn length can be easily changed, mass production is possible, and manufacturing cost can be reduced.

  Another object of the present invention is to provide a flat brush having a configuration capable of easily changing the density, yarn length, etc. of the thread material used as the material of the cylindrical brush, and capable of mass production and reducing the manufacturing cost. Objective.

  Still another object of the present invention is to provide a method of manufacturing a cylindrical brush and a flat brush that can manufacture these brushes efficiently and economically.

  The flat brush of the present invention is a welded flat brush in which a large number of meltable yarn materials constituting the brush spread laterally and are arranged in a brush shape, and each yarn material is integrated by welding on one end side.

  Moreover, the cylindrical brush of this invention is a spiral cylindrical brush comprised when the said welding flat brush was wound spirally by making the strip | belt-shaped welding part formed in the fixed side into inner side.

  Further, the flat brush manufacturing method of the present invention includes an aligning step in which a large number of meltable yarn materials constituting the brush are spread laterally and aligned in a brush shape, and the multiple yarn materials aligned in a brush shape are arranged at one end. And a welding step in which a welding flat brush is integrated by welding on the side.

  The cylindrical brush manufacturing method of the present invention is a spiral cylindrical brush obtained by spirally winding a welded flat brush manufactured by the flat brush manufacturing method with a belt-like welded portion formed on the fixed side inside. It is what it is.

  In the cylindrical brush of the present invention, the flat brush is made of a meltable thread material, and these thread materials are integrated by welding on one end side. And this flat brush is comprised by being wound spirally by making the strip | belt-shaped welding part formed in the fixed side inside. According to this configuration, since all parts including the cylindrical core portion are formed of the thread material, an all-resin cylindrical brush is formed if the thread material is a resin thread.

  The belt-like welded portion is preferably wound spirally without a gap. Thereby, a cylindrical core part is formed by the belt-like welded part. The cylindrical core can be integrated by welding. Thereby, a core part with high mechanical strength is formed.

  If such a cylindrical brush is attached to the tip of the handle that is operated in the central axis direction, a cylindrical toothbrush that has a small number of parts, is easy to manufacture, and is inexpensive.

  In the flat brush of the present invention, the belt-like welded portion formed on the fixed side may have the same thickness as the thickness of the brush portion where the thread material is dense, but if it has a flange shape protruding in at least one of the thickness direction, The spacing (pitch) between the spiral brush portions of the cylindrical brush is adjusted by the amount of protrusion. That is, if the protrusion amount is 0, the spiral brush portions of the cylindrical brush approach each other, and if the protrusion amount is increased, the interval (pitch) between the spiral brush portions is increased.

  The flat brush of the present invention is a welded flat brush in which a large number of meltable yarn materials constituting the brush spread laterally and are arranged in a brush shape, and each yarn material is integrated by welding on one end side. Moreover, the cylindrical brush of this invention is a spiral cylindrical brush comprised when the said welding flat brush was wound spirally by making the strip | belt-shaped welding part formed in the fixed side into inner side.

  For this reason, if the flat brush and the cylindrical brush of the present invention use a resin thread as a thread material that is a brush material, a single resin from which metal is excluded becomes a brush of the same resin. Therefore, recycling is easy. Further, unlike the method of fixing the brush material with caulking or the like, the brush material is welded and fixed, so that the brush material is drastically reduced and can be used in the food and medical fields. Moreover, the problem of metal corrosion (rust) and brush weight can be solved.

  In particular, the cylindrical brush of the present invention can reduce the thickness of the cylindrical core portion and the hole diameter of the center hole compared to those of a nylon circular brush, so that the hair length in the brush portion can be increased in the case of the same outer diameter, If the hair length is the same, the bra or outer diameter can be reduced. Moreover, the hole diameter of the center hole inside the core part can be freely changed by changing the winding diameter of the belt-like welded part. The brush diameter can also be changed within a wide range of 1.5 to 300 mm or more. Since there is no need for laminating operations such as laminating nylon circular brushes, the brush length can be easily increased, enabling mass production and cost reduction.

  Because of these advantages, the flat brush and cylindrical brush of the present invention are not only toothbrushes but also interdental brushes, static eliminator brushes, household appliance brushes, industrial brushes, face brushes, hair brushes, home brushes that do not use any metal components. It can be applied to a wide range of uses such as a supply brush.

  In addition, although the flat brush and cylindrical brush of this invention are based on a resin brush, if it is a heat-meltable substance, it can also manufacture with metals other than resin, for example.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a flat brush showing an embodiment of the present invention, FIG. 2 is a side view of a cylindrical brush using the flat brush, and FIG. 3 is a front view of the cylindrical brush.

  As shown in FIG. 1, the flat brush 10 of the present embodiment includes a brush portion 12 in which a large number of yarn materials 11 constituting the brush are formed in parallel, and a weld portion formed on one end side of the brush portion 12. 13 Since the thread material 11 is based on a toothbrush, it is a nylon resin thread. The brush portion 12 has a brush shape in which a large number of yarn materials 11 are spread widely in parallel. Since the welding part 13 is formed by integrating the respective thread materials 11 in the brush part 12 by welding, it has flexible flexibility. The welded portion 13 has a strip shape that is long in the lateral width direction of the brush portion 12, and has a flange shape that protrudes on both sides in the thickness direction (front-rear direction) of the brush portion 12. In other words, a large number of thread members 11 project in the perpendicular direction from the entire length of the central portion in the depth direction of the belt-like welded portion 13 to form a brush-like brush portion 12.

  And the cylindrical brush 20 of this embodiment is comprised by winding the said flat brush 10 helically without a gap | interval with the band-shaped welding part 13 inside as shown in FIG.2 and FIG.3. Has been. Therefore, the cylindrical brush 20 includes a cylindrical core portion 21 formed by being spirally wound with no gap between the belt-like welded portion 13 and the brush portion 12 of the flat brush 10 on the welded portion 13 side. The cylindrical brush portion 22 is formed by surrounding the core portion 21 in a spiral shape with the inner peripheral side being the inner peripheral side. The brush part 12 is spirally wound with the welded part 13 side as the inner peripheral side, so that the outer peripheral side is opened. For this reason, the cylindrical brush portion 22 has a configuration in which a large number of yarn materials 11 are spirally wound around the core portion 21 while extending radially from the core portion 21.

  Here, the spiral brush portion 12 constituting the cylindrical brush portion 22 has a flange shape in which the weld portion 13 on the inner peripheral side protrudes on both sides in the thickness direction. It spirals spirally. The size of the gap S is governed by the protruding amount s on both sides of the welded portion 13, and is specifically twice the protruding amount s. Due to the gap S, the yarn material 11 is not crowded in the brush portion 22. Further, the density of the thread material 11 in the brush portion 22 is adjusted by changing the gap S.

  Next, a method for manufacturing the flat brush and a cylindrical brush using the flat brush will be described. FIG. 4 is an explanatory view of a manufacturing process of a flat brush, FIG. 5 is an explanatory view of a process of manufacturing a cylindrical brush from the manufactured flat brush, and FIG. 6 is an explanatory view of a finishing process of the cylindrical brush.

  In the production of a flat brush, as shown in FIG. 4, a thread material group 1 is gripped by a lifting / lowering thread raising chuck 2 in a state where a bundle of a predetermined number of thread materials 11 is laterally spread and spread. The yarn raising chuck 2 grips the yarn material group 1 from both sides in the thickness direction at a position slightly lowered from the tip portion by utilizing expansion or contraction of a spring or rubber, and raises the yarn material group 1.

  A two-part die 3 is disposed above the yarn raising chuck 2. The mold 3 has a horizontally long through hole through which the thread material group 1 passes between opposing surfaces, and the upper end of the horizontally long through hole is a recess corresponding to the shape of the welded portion 13 of the flat brush 10 to be manufactured. 3a. The thread material group 1 is always inserted into the through hole of the mold 3 and is held at a level slightly protruding above the mold 3. The protruding amount of the thread material group 1 from the mold 3 is determined according to the volume of the welded portion 13 of the flat brush 10. That is, the protrusion amount is set so that the inside of the concave portion 3 a corresponding to the welded portion 13 is filled with the melted material (molten resin) of the yarn material group 1.

  With the thread group 1 slightly protruding above the mold 3, the laterally long welding horn 4 provided above the mold 3 is lowered to the vicinity of the front end surface of the thread group 1. The welding horn 4 is heated to an appropriate temperature by an internal heater 4A and melts the vicinity of the tip of the yarn group 1 in a non-contact manner by radiant heat. By this melting, the inside of the concave portion 3 a corresponding to the welded portion 13 of the mold 3 is filled with the melt (molten resin) of the thread material group 1. The yarn material group 1 can be melted by a flame capable of temperature control instead of the welding horn 4.

  When the melting is completed, the welding horn 4 is retracted, and instead, the cooling horn 5 is moved directly above the mold 3 and descends, and the molten material is pressed from above by its horizontal lower surface. This step is performed to increase the strength of the melt-molded portion and to flatten the end face shape, and is performed when the molten resin has sufficient residual heat (about 160 ° C. in the case of nylon resin). Thus, the welded portion 13 of the flat brush 10 to be manufactured is formed in the concave portion 3 a above the through hole of the mold 3. Cooling and shaping by the cooling horn 5 contributes to improving the efficiency in winding the manufactured flat brush 10, improving the quality of the cylindrical brush 20 as a product, and stabilizing the shape.

  When the cooling and shaping by the cooling horn 5 are finished, the cooling horn 5 is retracted to the original position, and the yarn raising chuck 2 is raised. As a result, the thread group 1 is exposed on the mold 3 together with the welded portion at the tip. When the yarn material group 1 is raised by an amount corresponding to the height of the flat brush 10 to be manufactured (brush length H), the yarn material group 1 is not shown slightly above the mold 3 so that the rise is removed. Cut with a cutter. Thus, the flat brush 10 shown in FIG. 1 is manufactured. After cutting, the state returns to the state of FIG. 4 in which the thread material group 1 slightly protrudes above the mold 3.

  By repeating this, the flat brush 10 shown in FIG. 1 is automatically and continuously manufactured.

  As shown in FIG. 5, the manufactured flat brush 10 is wound around a round bar-shaped winding heater 6 with the welded portion 13 inside. That is, the belt-like welded portion 13 of the flat brush 10 is wound around the winding heater 6 without a gap. The winding heater 6 is preheated. The temperature is higher than the softening point of the thread material 11 constituting the flat brush 10 and lower than the melting point. Specifically, in the case of resin, it is about 130 to 180 ° C. although it depends on the melting point. Winding is performed by one end of the flat brush 10 in the width direction being fixed by the fixed chuck 7 and the rotating chuck 8 gripping the other end rotating around the heater 6. Specifically, for example, when the rotary chuck 8 rotates, the round bar-shaped take-up heater 6 moves in the heater axial direction together with the fixed chuck 7 to cause the rotary chuck 8 to execute a relative spiral motion.

  By this winding, the flat brush 10 is formed into a cylindrical brush 20 as shown in FIGS. Similar to the temperature of the take-up heater 6, the speed of the rotary chuck 8 is appropriately adjusted depending on the diameter of the yarn material 11 and the resin component.

  Thus, the cylindrical brush 20 is completed once. In the completed cylindrical brush 20, the tensile strength of the thread material 11 in the brush portion 22 is 20 N or more, which is comparable to the tensile strength of the thread material 11 itself. Although the axial strength of the core portion 21 is not a problem, the core portion 21 is formed by winding the belt-like welded portion 13 of the flat brush 10, so that it is in an extended state depending on the method of use. In order to prevent this, as shown in FIG. 6, a rod-shaped inner surface welding horn 9 by ultrasonic waves is inserted into the core portion 21, and the inner peripheral surface of the core portion 21 is melted. Thereby, the elongation of the core portion 21 is permanently prevented.

  The design dimensions of the completed cylindrical brush 20 and the freedom of design specifications will be described with reference to FIGS. The center hole of the cylindrical brush 20, that is, the inner diameter d of the cylindrical core portion 21 is determined by the winding diameter of the belt-like welded portion 13 of the flat brush 10. That is, it depends on the outer diameter of the winding heater 6 to be used. Therefore, the inner diameter d can be freely changed over a wide range without being restricted by others.

  The outer diameter D of the cylindrical core portion 21 is determined by the height k of the welded portion 13 in the flat brush 10 and the winding diameter described above. The height k of the welded portion 13 can be reduced, and the winding diameter can be freely changed. For this reason, if the outer diameter D of the core part 21 can be made small and the brush diameter is made constant, the hair length h in the brush part 22 can be made long, and if the hair length h is made constant, the brush diameter can be made small.

  FIG. 7 is an explanatory view of a method for manufacturing a toothbrush using the cylindrical brush.

  The manufactured cylindrical brush 20 can be used as a brush head of a toothbrush. That is, the round brush-like shaft portion formed at the tip of the toothbrush handle 30 is pierced through the center hole inside the core portion of the cylindrical brush 20, and the cylindrical brush 20 is fixed to the shaft portion. Is manufactured. As a method of fixing the cylindrical brush 20 to the shaft portion of the handle 30, the shaft portion is press-fitted into the center hole inside the core portion of the cylindrical brush 20, and the tip portion protruding from the end of the cylindrical brush 20 is increased in diameter by welding. There is a way. In this case, when the core part 21 of the cylindrical brush 20 is not welded to the inner surface, the core part 21 may be extended.

  The method shown in FIG. 7 is a method for preventing the extension of the core 21 without welding the core 21 of the cylindrical brush 20 on the inner surface. In this method, a shaft portion 31 having an outer diameter smaller than the central hole of the cylindrical brush 20 is provided at the distal end portion of the handle 30 made of PP or PET. The small-diameter shaft portion 31 is provided with a plurality of through-holes 32 in a perpendicular direction. With the small-diameter shaft portion 31 facing upward and being inserted into the central hole of the cylindrical brush 20, an adhesive resin is injected into the central hole from the upper resin injector 40, and the tip of the handle 30 is injected with this resin. The cylindrical brush 20 is bonded and fixed to. By bonding and fixing the cylindrical brush 20, the core portion 21 is also bonded and fixed, and its elongation is prevented.

  The adhesive resin used here is preferably a dimer acid-based thermoplastic polyamide resin. This resin exhibits adhesiveness to the nylon resin constituting the cylindrical brush 20 and satisfies the mechanical strength required for the handle 30 after curing. Moreover, it conforms to the “Standards for Food Sanitation Law / Food, Additives, etc.” (Ministry of Health and Welfare Notification No. 370 in 1959) and has no safety problems. Furthermore, since the softening point is low, it becomes a fluid state at a relatively low temperature, the viscosity in the fluid state is low, and the fluidity is good, so that the tip portion of the handle 30 can be molded even under low pressure. The general chemical structure of a dimer acid based thermoplastic polyamide resin is shown in Formula 1.

  However, this resin does not exhibit the same adhesiveness as that of nylon with respect to PP and PET constituting the handle 30. Therefore, a plurality of right-angled through holes are provided in the small-diameter shaft portion of the handle 30, and the cylindrical brush 20 and the handle 30 are mechanically coupled to each other by flowing resin therein. As a result, the coupling between the cylindrical brush 20 and the handle 30 is complete.

  FIG. 8 is an explanatory diagram of another toothbrush structure. This toothbrush is not a cylindrical type as described above, but is a flat brush in which thread materials in the brush portion are densely oriented in one direction. In this flat brush, the brush portion is formed by the flat brush 10 which is a molding material of the cylindrical brush 20.

  More specifically, the flat brush 10 is fixed to the head portion of the handle 20 by so-called insert molding, in which the toothbrush handle 30 is molded and the flat brush 10 is inserted into the head portion. As the mold resin, the above-mentioned dimer acid-based thermoplastic polyamide resin is preferable from the viewpoint of adhesion to the flat brush 10 and the like.

  Here, the brush portion of the flat brush has a configuration in which a plurality of flat brushes 10 are arranged in parallel, but it is needless to say that the present invention is not limited to this. As a matter of course, the flat brush 10 is embedded in the head portion of the handle 30 on the side of the welded portion 13.

  9A and 9B are perspective views of another flat brush of the present invention. In the flat brush 10 of FIG. 9A, a strip-like welded portion 13 formed at one end portion in the height direction of the flat brush 10 projects from the brush portion 12 only on one side in the brush thickness direction. It has become. Incidentally, in the flat brush 10 shown in FIG. 1, the welding part 13 is the both flange shape which protruded to the both sides of the brush thickness direction. Further, in the flat brush 10 of FIG. 9B, the belt-like welded portion 13 formed at one end portion in the height direction of the flat brush 10 has the same thickness as the brush portion 12. That is, the welding part 13 does not protrude on either side of the brush thickness direction with respect to the brush part 12.

  Thus, the welding part 13 in the flat brush 10 may be the same thickness as the brush part 12, and may protrude to any side or both sides in the thickness direction. When the welding part 13 is the same as the brush part 12, in the cylindrical brush 20 using this, the brush part 12 becomes a shape swirled densely without a gap. On the other hand, when the welding part 13 is a flange shape, the gap according to the protrusion amount is ensured in the center axis direction in both the flanges and both flanges.

It is a perspective view of the flat brush which shows one Embodiment of this invention. It is a side view of the cylindrical brush which uses the same flat brush. It is a front view of the cylindrical brush. It is explanatory drawing of the manufacturing process of a flat brush. It is explanatory drawing of the process of manufacturing a cylindrical brush from the manufactured flat brush. It is explanatory drawing of the finishing process of the cylindrical brush. It is explanatory drawing of the method of manufacturing a toothbrush using the cylindrical brush. It is structure explanatory drawing of another toothbrush. (A) and (b) are perspective views of another flat brush of the present invention. It is explanatory drawing of the manufacturing process of the toothbrush which uses the conventional cylindrical brush. It is explanatory drawing of the manufacturing process of the toothbrush. It is a front view of the conventional cylindrical brush.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Thread material group 2 Thread raising chuck 3 Die 3a Recess 4 Welding horn 5 Cooling horn 6 Winding heater 7 Fixed chuck 8 Rotating chuck 9 Inner surface welding horn 10 Flat brush 11 Thread material 12 Brush part 13 Welding part 20 Cylindrical brush 21 Core Part 22 Brush part 30 Handle

Claims (10)

  A welding flat brush in which a large number of meltable yarn materials constituting a brush are spread horizontally and arranged in a brush shape, and the respective yarn materials are integrated by welding on one end side.   A welding flat brush in which a belt-like welded portion formed on the fixed side has a flange shape protruding in one or both of the thickness direction of the brush portion in which the thread material is densely packed.   A spiral cylindrical brush constructed by winding the welding flat brush according to claim 1 or 2 spirally with a belt-like welded portion formed on a fixed side as an inside.   The spiral cylindrical brush according to claim 2, wherein the belt-like welded portion is spirally wound without a gap and formed into a cylindrical shape.   5. The spiral cylindrical brush according to claim 4, wherein a cylindrical core portion formed by spirally winding a belt-shaped welded portion without a gap is integrated by welding.   A toothbrush in which the spiral cylindrical brush according to any one of claims 3 to 5 is attached to a distal end portion of a handle operated in a central axis direction.   An alignment process of spreading a plurality of meltable yarn materials constituting the brush horizontally and aligning them in a brush shape, and welding a flat brush by integrating a plurality of yarn materials aligned in a brush shape on one end side by welding A flat brush manufacturing method including a welding step.   A spiral cylinder produced by spirally winding a welded flat brush produced by the flat brush production method according to claim 7 with a belt-like welded portion formed on the fixed side as an inner side to form a spiral cylindrical brush Brush manufacturing method.   The manufacturing method of the spiral cylindrical brush of Claim 8 WHEREIN: The said welding part is wound around the heated shaft body, and the manufacturing method of the spiral cylindrical brush which carries out a shaping process helically.   9. The method of manufacturing a spiral cylindrical brush according to claim 8, wherein a belt-shaped welded portion is spirally wound without a gap to form a cylindrical core, and the core is integrated by welding. Manufacturing method.