JP4153555B1 - Dust collection filter manufacturing method and apparatus - Google Patents

Abstract

When manufacturing a cylindrical dust collecting filter by thermally fusing both ends of a filter cloth made of non-woven fabric that is folded so as to fold to the center side, desired portions at both ends are accurately heat-fused. Provided is a method for manufacturing a dust collecting filter and a manufacturing apparatus for the dust collecting filter that can be attached and can prevent short fibers from being released from an end face and adhesion of dust to the end face.
The dust collecting filter manufacturing apparatus of this embodiment is formed into a substantially cylindrical shape by rounding both ends of a flat long filter cloth 2 made of a thermoplastic resin so as to be folded toward the center. However, the body 1 is a device for heat-sealing both ends overlapped with each other, and the main body 1 has rollers 6a and 6b that feed the downstream side of the filter cloth 2 with a desired force and a filter cloth on the table 3. 2, guide members 4 a and 4 b for guiding 2, a holder 11, and heating tools 5 a and 5 b for melting predetermined portions of the filter cloth 2.
[Selection] Figure 1

Description

  The present invention relates to a method for manufacturing a dust collecting filter and a manufacturing apparatus thereof, which are made of a cylindrical nonwoven fabric that captures dust floating in the air, and in particular, the both ends of the filter cloth are folded to the center side to form a cylindrical shape. The present invention relates to a method and an apparatus for heat-sealing both ends of a filter cloth that is overlapped in a cross section of a body portion formed in the above.

  In factories and processing facilities, various dust collectors are used to remove dust contained in the generated exhaust gas. Generally, these dust collectors are often provided with a cylindrical dust collecting filter made of a filter cloth made of organic fibers or inorganic fibers. By the way, such a dust collecting filter is manufactured by forming the filter cloth into a cylindrical shape so that both ends of the long flat filter cloth are folded toward the center, and joining the overlapped both ends. The Conventionally, the filter cloth has been joined by sewing, but this method has a problem in that dust leaks through the sewing machine needle hole remaining in the joint. Therefore, as a method for solving such a problem, a method of joining both end portions of the filter cloth by heat fusion has attracted attention.

The technology for heat-sealing two pieces of fabric made of a polymer material has been actively researched in various fields, and several inventions and devices have already been filed in this regard. For example, Patent Document 1 discloses a method and a joining apparatus for joining a water shielding sheet laid for waterproofing in a park or the like by thermal fusion, under the name of “water shielding sheet joining method and joining apparatus”. ing.
The invention disclosed in Patent Document 1 removes the surface layer portion of the joining portion with a polishing tool, blasting, and the like, and heat-fuses two water shielding sheets by pressing with a rotor while injecting hot air to the joining portion. To do.
According to such a method, the portion that has been exposed and deteriorated in the atmospheric environment is removed in advance from the joint portion, and therefore the joint portion can be reliably fused.

Further, in Patent Document 2, a single-layer film made of a single material of a thermoplastic resin such as polyethylene is conveyed under the name of “single-layer film bag making apparatus, single-layer film bonding method and single-layer film bonding machine”. However, an invention relating to an apparatus capable of forming a bag with an upholstery on the back, a method for adhering a single layer film, and an apparatus for adhering a single layer film is disclosed.
The “single-layer film bag making apparatus” disclosed in Patent Document 2 includes a film transport unit, an adhesive unit aligning unit that superimposes both side edges of the film and aligns the vertical adhesive unit, and an overlapped vertical unit. The vertical fusing heater unit, the vertical cooling unit, the vertical preheating heater unit, the vertical fusing heater unit, and the vertical cooling unit that melt and bond the bonding unit are moved up and down in conjunction with the intermittent conveyance of the film conveying means. And a vertical drive unit.
According to such a structure, the single-layer film can be quickly fused and formed into a bag shape without deforming or tearing the bonded portion or the periphery.

Furthermore, Patent Document 3 discloses an invention relating to an apparatus for continuously welding edges of two sheet materials under the name “sheet welding machine”.
The “sheet welding machine” disclosed in Patent Document 3 includes a wedge-shaped heating tool and a pressure roller, and a compressed air discharge pipe that protrudes from the converging portion of the heating tool in the running direction of the sheet material.
According to such a structure, the edge of the sheet material is pinched by the pressure roller immediately after being melted by the heating tool. Further, the upper and lower sheet materials in contact with the compressed air discharge pipe are separated, and a continuous unwelded zone is formed by the compressed air discharged from the front end portion. And since there exists a welding defect location, compressed air will leak, the presence or absence of a welding failure location can be detected easily.
JP 2002-18388 A JP 2004-136623 A Special Table 2002-060675

  The invention disclosed in Patent Document 1 has a configuration in which hot air is blown to the joining portion and melted, and thus there is a problem in that the melting range cannot be strictly controlled. In addition, for example, when a filter cloth made of a nonwoven fabric having a thickness of about 1 to 2 mm is bonded by the above-described bonding method, the short fibers constituting the filter cloth are released from the end face remaining exposed to the outside, Or there is a possibility that another dust may adhere to the end face. Therefore, the invention disclosed in Patent Document 1 has a problem that it is not suitable for a dust collecting filter using such a filter cloth.

  In the invention disclosed in Patent Document 2, it is possible to automatically form a bag made of a single layer film by performing longitudinal adhesion and lateral adhesion by a series of conveying operations on a single layer film made of a thermoplastic resin. it can. However, since the present invention is configured to melt only the adhesive surface, for example, when the end of a filter cloth made of a nonwoven fabric having a thickness of about 1 to 2 mm is heat-sealed to form a bag shape There was a problem that the end face remained fuzzy. In this case, various kinds of dust are likely to adhere to the end face, and the short fibers constituting the nonwoven fabric may be separated from the end face. Therefore, such a filter cloth cannot be used for the dust collecting filter.

  In the invention disclosed in Patent Document 3, although the edge portions of the two sheet materials can be welded continuously, the configuration is such that the end portions of the sheets that are butted together at the center are welded. Therefore, there is a problem that the sheet cannot be formed into a bag shape. Further, since the wedge-shaped heating tool is installed in parallel to the sheet conveying direction, for example, when the edge of the filter cloth made of a nonwoven fabric having a thickness of about 1 to 2 mm is welded, the end face of the filter cloth There was a problem that remained in a fuzzy state. In this case, there is a possibility that the short fibers may be released from the end face or dust may adhere to the end face. That is, the invention disclosed in Patent Document 3 has a problem that it cannot be applied to the joining of filter cloths for filters.

  The present invention has been made in response to such a conventional situation, and manufactures a cylindrical dust collecting filter by heat-sealing both ends of a filter cloth made of nonwoven fabric that is overlapped so as to be folded in the center. At the same time, a method and an apparatus for manufacturing a dust collecting filter capable of accurately heat-sealing desired portions at both ends and preventing the release of short fibers from the end surfaces and the adhesion of dust to the end surfaces The purpose is to provide.

In order to achieve the above object, the dust collecting filter manufacturing apparatus according to claim 1 is a dust collecting filter manufacturing apparatus that heat-seals two ends of a filter cloth made of a thermoplastic resin in an overlapping manner. , The table on which the filter cloth is placed, the transport means for transporting the filter cloth, the joining surface (the surface to be heat-sealed) at the end and the end face are installed close to the end surface and the joining surface and the end surface are melted And a heating unit that is installed on the downstream side of the heating unit and pressurizes an end including the joining surface and the end surface through a filter cloth.
In the dust collecting filter manufacturing apparatus having such a structure, the process of melting the joining surface and the end surface and pressurizing the end including the joining surface and the end surface is continuously performed while the filter cloth is being conveyed. By being pressed in the state, the end face is crushed, and as a result, the end is smoothed.

According to a second aspect of the present invention, in the dust collecting filter manufacturing apparatus according to the first aspect, the pressurizing means is installed in a substantially symmetrical position with the filter cloth interposed therebetween so that the distance between them can be changed. A pair of rollers that clamp the end portion through a cloth is provided.
According to the dust collecting filter manufacturing apparatus having such a structure, by changing the distance between the pair of rollers, the force for pinching the end portion is adjusted.

According to a third aspect of the present invention, in the dust collecting filter manufacturing apparatus according to the first or second aspect of the present invention, the dust collecting filter manufacturing apparatus includes a substantially S-shaped retainer having two continuous convex surfaces. Is characterized in that it is installed on the upstream side of the heating means so that one of the convex surfaces is arranged between the end portions superimposed on the two layers.
The dust collecting filter manufacturing apparatus having such a structure has an effect that the distance between the end portions superimposed on the two layers is kept substantially constant by the convex surface disposed therebetween.

According to a fourth aspect of the present invention, in the dust collecting filter manufacturing apparatus according to any one of the first to third aspects, the first joining surface and the end face are individually heated as heating means. The heating tool and the second heating tool are provided.
In the dust collecting filter manufacturing apparatus having such a structure, when different temperatures are set for the first heating tool and the second heating tool, there is a difference in the melting state of the joining surface and the end face of the end portion. It has the action.

According to a fifth aspect of the present invention, in the filter device for collecting dust according to the fourth aspect, the filter cloth is formed in a cylindrical shape by folding the end portions on both sides to the center side and overlapping the two layers. The second heating tool is installed close to the end surface of the end portion of the inner layer.
In the dust collection filter manufacturing apparatus having such a structure, the inner surface of the filter cloth formed in a cylindrical shape is smoothed by being crushed by the pressurizing means after the end surface of the end portion of the inner layer is melted. It has the action.

According to a sixth aspect of the present invention, there is provided a method for producing a dust collecting filter, the method for producing a dust collecting filter in which the end portions of a filter cloth made of a thermoplastic resin are superposed on two layers and thermally fused. A process of heating and melting the joining surface (surface to be heat-sealed) and the end face while conveying, and a step of pressing the end part including the end face and the joining surface through a filter cloth. It is a feature.
According to such a method for manufacturing a dust collecting filter, the end surface is crushed and the end portion is smoothed by melting and pressurizing the end surface.

According to a seventh aspect of the present invention, there is provided a method for producing a dust collecting filter, wherein a filter cloth made of a thermoplastic resin is formed into a cylindrical shape by folding both end portions toward the center and overlapping two layers. A step of heating, melting the joint surface of the end (surface to be heat-sealed) and at least the end surface of the end on the inner layer side while transporting the filter cloth, and the joint surface and the end surface through the filter cloth And a step of pinching the end portion including.
According to such a dust collecting filter manufacturing method, the end face of the inner layer is melted and pressed to crush the end face, thereby forming a cylindrical filter cloth with a smooth inner face. Has the effect of

  As described above, in the dust collection filter manufacturing apparatus according to claim 1 of the present invention, since two different types of processing such as end smoothing and heat fusion can be performed at the same time, the dust collection filter Is shortened. Also, these processes can be realized with a simple structure. Therefore, it is possible to reduce the manufacturing cost of the apparatus and the manufacturing cost of the dust collecting filter. Furthermore, by smoothing the end of the filter cloth, it is possible to prevent the short fibers constituting the filter cloth from being released and the dust from adhering.

  In the dust collecting filter manufacturing apparatus according to the second aspect of the present invention, a desired pressure can be evenly applied from both sides to the joint surface of the end portion, and the joint surface can be reliably heat-sealed.

  In the dust collecting filter manufacturing apparatus according to claim 3 of the present invention, a space for arranging the heating means is secured between the end portions superimposed on the two layers. The position of the heating means can be easily adjusted.

  In the dust collecting filter manufacturing apparatus according to claim 4 of the present invention, the molten state of the joint surface and the end surface can be adjusted according to the material and thickness of the filter cloth.

  In the dust collecting filter manufacturing apparatus according to the fifth aspect of the present invention, a cylindrical filter cloth used for filtering the air flow from the outside to the inside can be easily formed.

  According to the method for manufacturing a dust collecting filter according to claim 6 of the present invention, since the end of the filter cloth is smoothed, it is possible to prevent the short fibers constituting the filter cloth from being detached and the dust from adhering. That is, according to the method of the present invention, the end portions can be heat-sealed without deteriorating the filter function of the filter cloth.

  According to the method for manufacturing a dust collecting filter according to claim 7 of the present invention, it is possible to easily and inexpensively manufacture the dust collecting filter used for filtering the air flow from the outside to the inside. It is.

  An example of a method for manufacturing a dust collecting filter and an apparatus for manufacturing the same according to the best mode of the present invention will be described with reference to FIGS.

A dust collecting filter manufacturing apparatus of Example 1 will be described with reference to FIGS. 1 to 4 (particularly, corresponding to claims 1 to 3).
FIG. 1 is a perspective view showing a part of the appearance of Example 1 of a dust collection filter manufacturing apparatus according to an embodiment of the present invention. FIGS. 2A and 2B are a partial side view and a side view of the heating means of the dust collecting filter manufacturing apparatus of Embodiment 1, respectively. 3A is an external perspective view of the filter cloth showing a state guided by the guide member, FIG. 3B is an external perspective view of the holder, and FIG. 3C shows a state in which the holder is installed. It is an external appearance perspective view of a filter cloth.

The dust collecting filter manufacturing apparatus of the present embodiment rolls up both ends of a flat long filter cloth so as to be folded toward the center side to form a substantially cylindrical shape, and heats the overlapped both ends while transporting in this state. It is a device for fusing. The filter cloth is a nonwoven fabric made of a thermoplastic resin such as polyester, polyamide, polyethylene, polypropylene, urethane, acrylic, vinyl chloride, silicon, or fluorine.
As shown in FIGS. 1 and 2A, the main body 1 includes a table 3, guide members 4a and 4b, a holder 11, heating tools 5a and 5b, rollers 6a and 6b, and a servo motor (not shown). The filter cloth 2 rounded into a substantially cylindrical shape is placed on the upper surface of the table 3, and rollers 6 a and 6 b are installed above and below the filter cloth 2, respectively. The rollers 6a and 6b are driven by a servo motor so as to be rotatable. When the rollers 6a and 6b are rotated in the direction of the arrow B, the filter cloth 2 is drawn downstream and sent out downstream. That is, the rollers 6 a and 6 b function as a pressurizing unit and a conveying unit for the filter cloth 2. By the function of the rollers 6a and 6b, the filter cloth 2 moves at a constant speed in the direction of arrow A while being guided by the guide members 4a and 4b on the table 3.
The rollers 6a and 6b are substantially cylindrical metal members. The roller 6a is attached to the main body 1 so that the position in the vertical direction can be changed by the position adjusting means 10, and the roller 6b faces the roller 6a with the filter cloth 2 interposed therebetween. As shown in FIG. That is, the rollers 6a and 6b are installed so that the interval between them can be changed. In this case, the force which clamps the filter cloth 2 is adjusted by changing the space | interval of roller 6a, 6b. In the dust collecting filter manufacturing apparatus of this embodiment, the rollers 6a and 6b are driven and rotated by a servo motor. However, the present invention is not limited to this. For example, the roller is driven by a servo motor. A structure in which one of 6a and 6b is driven can also be adopted. Further, a roller driven by a servo motor may be provided separately from the rollers 6 a and 6 b, and this roller may be used as a conveying means for the filter cloth 2. Further, without providing the roller 6b, the filter cloth 2 conveyed on the table 3 is pressurized from above by the roller 6a, or a flat plate material is installed in parallel to the table 3 instead of the roller 6a. The filter cloth 2 may be sandwiched between the material and the roller 6b. However, it is desirable to provide a pair of rollers 6a and 6b as in the present embodiment in order to apply the desired pressure evenly from above and below and reliably perform heat fusion of the filter cloth 2. Further, the material of the rollers 6a and 6b is not necessarily a metal, and may be a heat-resistant resin, rubber, or elastomer, for example.

On the downstream side of the guide members 4 a and 4 b and the holder 11, heating tools 5 a and 5 b are installed as heating means for melting a predetermined portion of the filter cloth 2. The heating tools 5a and 5b are metal blocks containing electric heating lines (not shown), and generate heat by energizing the electric heating lines through the cable 7a. Thereby, the target object which exists close to the surface is heated. In this embodiment, the heating tools 5a and 5b are used as heating means. However, the present invention is not limited to this. For example, one heating tool having a structure in which the heating tools 5a and 5b are integrally formed may be used. .
In the dust collecting filter manufacturing apparatus of the present embodiment, the heating tools 5a and 5b are arranged so as to be close to the end surface 2c and the joining surface 8a of the filter cloth 2, as shown in FIG. Therefore, the end surface 2c and the joint surface 8a are heated and melted by the heating tools 5a and 5b during the conveyance of the filter cloth 2. In this embodiment, the heating tools 5a and 5b are arranged so as to contact the end surface 2c and the joining surface 8a, but if the heating tools 5a and 5b are arranged sufficiently close to the end surface 2c and the joining surface 8a, Even if they are not in contact with each other, the above action by the heating tools 5a and 5b is exhibited.

As shown in FIG. 3 (a), guide members 4a and 4b made of a thin metal member and having a substantially C shape in a side view are fixed to the main body 1 by a fixture (not shown).
The filter cloth 2 conveyed on the table 3 slides inside the guide member 4a in a state where the end 2a is slidably held by the guide member 4b as shown in FIG. At this time, the guide member 4a has an action of maintaining the shape of the outer peripheral surface of the cylinder so as not to break by defining the shape of the outer peripheral surface of the cylinder with respect to the filter cloth 2 sliding inside thereof. Moreover, the guide member 4b restrict | limits the movement to the direction of arrow C about the edge part 2a of the filter cloth 2 which slides the inner side. That is, the guide member 4b has an effect of accurately defining the width of a portion where the end portions 2a and 2b overlap each other when the filter cloth 2 is viewed from above.
As shown in FIG. 3B, the holder 11 is a substantially S-shaped metal member in side view having two continuous convex surfaces 11a and 11b, and is fixed to the main body 1 by a fixture (not shown). . The holder 11 is installed between the guide members 4a and 4b and the heaters 5a and 5b, and the convex surface 11b is interposed between the end portions 2a and 2b overlapped in two layers as shown in FIG. Be placed. Thereby, the space | interval of edge part 2a, 2b is kept substantially constant. Further, the end portion 2a slides inside the convex surface 11a, so that the movement in the direction of the arrow C is restricted. As described above, since the shape of the filter cloth 2 is maintained by the guide members 4a and 4b, there is no possibility that the end 2a moves in the direction opposite to the arrow C and comes off from the inside of the convex surface 11a. That is, the holder 11 has an effect of keeping the distance between the end portions 2a and 2b substantially constant and defining the position of the end portion 2a in the width direction. Thereby, the space for arrange | positioning the heating tools 5a and 5b is ensured. Accordingly, the heating tools 5a and 5b can be correctly arranged at desired locations by adjusting the positions of the end portions 2a with respect to the joining surface 8a and the end surface 2c.

  As described above, in the dust collecting filter manufacturing apparatus having the above-described structure, the two processes of melting the joining surface 8a and the end surface 2c and pressurizing the end portions 2a and 2b are continuously performed while the filter cloth 2 is being transported. Done. Therefore, the time required for the two processes is shortened. This makes it possible to reduce the manufacturing cost of the dust collection filter. Further, since the pressure is applied by the rollers 6a and 6b immediately after the end surface 2c is melted, the end surface 2c is easily crushed. As a result, the end 2a is smoothed. Thereby, as will be described later, it is possible to prevent the short fibers constituting the filter cloth 2 from being separated from the end portion 2a and to prevent dust from adhering to the end portion 2a. These actions and effects are exhibited by the dust collecting filter manufacturing apparatus having a simple structure as shown in the present embodiment. That is, according to the filter manufacturing apparatus for dust collection of a present Example, the manufacturing cost of an apparatus can be reduced.

Next, a method for manufacturing a dust collecting filter using the dust collecting filter manufacturing apparatus of this embodiment will be described with reference to FIG. 4 (particularly, corresponding to claim 6).
4 (a) is a partially enlarged view of FIG. 2 (a), and (b) and (c) are partially enlarged views showing a filter cloth cross section in the vicinity of the end portion. The components shown in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 4 (a), both ends of the filter cloth 2 are rounded so as to be folded toward the center and formed into a substantially cylindrical shape. It is placed on the table 3 in a sandwiched state. Note that the end surface 2c and the joining surface 8a of the filter cloth 2 are in contact with the upper surface of the heating tool 5a and the side surface of the heating tool 5b, respectively. Therefore, when the heating tools 5a and 5b are heated, the end surface 2c and the joining surface 8a of the filter cloth 2 are easily melted.
In this embodiment, a polyester filter cloth 2 having a thickness of 2 mm is used, and the set temperatures of the heating tools 5a and 5b are set to 440 to 460 ° C. The feed speed of the filter cloth 2 by the rollers 6a and 6b is 3.5 to 7 m / min. The set temperature of the heating tools 5a and 5b depends on the material and thickness of the filter cloth 2, the conveying speed of the filter cloth 2, and the like. Therefore, the set temperature of the heating tools 5a and 5b is not limited to the case shown in the present embodiment, and can be changed as appropriate.
When the heating tools 5a and 5b are raised to a predetermined temperature and then the rollers 6a and 6b are rotated in the direction of the arrow B shown in FIG. 4A, the filter cloth 2 causes the end face 2c and the joining surface 8a to move the heating tool 5a. It moves to the direction of arrow A, making it contact with the side surface of this and the upper surface of the heating tool 5b, respectively. At this time, the end surface 2c and the joining surface 8a of the filter cloth 2 heated by the heating tools 5a and 5b are melted, and the end portions 2a and 2b are subsequently clamped from above and below by the rollers 6a and 6b. As a result, the joining surface 8a is thermally fused to the joining surface 8b, and the end 2a is smoothed.

The nonwoven fabric constituting the filter cloth 2 is formed by gathering raw material fibers, and the end face 2c is fuzzy. Therefore, for example, when only the joining surfaces 8a and 8b are heat-sealed without melting the end surface 2c, the end portion 2a is not smoothed as shown in FIG. A level difference will be generated by that amount. In this case, there is a possibility that the short fibers may be released from the end face 2c. In addition, since various kinds of dust are likely to adhere to the end surface 2c as compared to other portions, there is a high possibility that dust attached before use is released during use. As a result, the filter cloth 2 functions as a filter.
On the other hand, according to the method for manufacturing the dust collecting filter of this embodiment, the end 2a is smoothed as shown in FIG. Therefore, it is difficult for the short fibers to be released from the end 2a. Further, there is no possibility that dust adheres to the end 2a. That is, in the method for manufacturing the dust collecting filter of the present embodiment, the joining surfaces 8a and 8b can be heat-sealed without deteriorating the filter function of the filter cloth 2.

The material and thickness of the filter cloth 2 and the feed speeds of the rollers 6a and 6b are not limited to those shown in the present embodiment, and can be changed as appropriate. In the present embodiment, the position adjusting means 10 is attached to the roller 6a. However, it may be attached to the roller 6b instead of the roller 6a, or may be attached to both the rollers 6a and 6b. Further, in FIG. 2B, the heating tool 5b is in contact with only the joining surface 8a of the end 2a. However, the present invention is not limited to this. For example, the lower surface of the heating tool 5b is connected to the joining surface of the end 2b. You may make it contact 8b.

Example 2 will be described with reference to FIG. 5 (particularly, corresponding to claim 4).
Fig.5 (a) is a side view of the heating means in the dust collection filter manufacturing apparatus of Example 2, (b) and (c) are the elements on larger scale which show the filter cloth cross section of an edge part vicinity. In addition, about the component shown in FIG.2 (b), the same code | symbol is attached | subjected and the description is abbreviate | omitted.
As shown in FIG. 5 (a), the heating means in the dust collecting filter manufacturing apparatus of the present embodiment incorporates an electric heating wire (not shown) in each of the heating tools 5a and 5b in the first embodiment, and the heating tool 5a. , 5b, a heat insulating plate 9 is provided. The heating tools 5a and 5b can be individually heated by energizing them through the cables 7a and 7b.
In general, the melted state of the filter cloth 2 is not uniform because it is affected by the material and thickness. Therefore, even when the set temperatures of the heating tools 5a and 5b are the same, if the material and thickness of the filter cloth 2 are different, for example, as shown in FIGS. 5B and 5C, the joining surface 8a of the end portion 2a. And the end surface 2c may have a difference in the molten state. On the other hand, in the heating means having the above structure, the heating tools 5a and 5b can be set to different temperatures. Therefore, it is possible to provide a difference in the heating temperature of the joining surface 8a and the end surface 2c of the end portion 2a and individually adjust the melting state thereof.

Example 3 will be described with reference to FIG. 6 (particularly, corresponding to claims 5 and 7).
6 (a) and 6 (b) are side views of heating means in the dust collecting filter manufacturing apparatus of Example 3, and (c) and (d) are partially enlarged views showing a filter cloth cross section near the end. is there. FIGS. 6C and 6D correspond to FIGS. 6A and 6B, respectively. Also, the components shown in FIGS. 5A to 5C are denoted by the same reference numerals, and description thereof is omitted.
As shown in FIG. 6A, the dust collecting filter manufacturing apparatus of the present embodiment is provided with a heating tool 5c installed in the vicinity of the end surface 2d of the end 2b in the heating means of the first embodiment. .
After the end surface 2d of the end portion 2b is melted and then the end portion 2b is clamped by the rollers 6a and 6b, the end surface 2d is easily crushed as shown in FIG. As a result, the tubular filter cloth 2 in which the end 2b is smoothed and heat-sealed is obtained. As shown in FIG. 6 (b), even when the heating tool 5b is not provided, the end surface 2d is easily crushed as shown in FIG. 6 (d), so the heating means of FIG. 6 (a) is used. As in the case of the case, the cylindrical filter cloth 2 in which the end 2b is smoothed and heat-sealed can be obtained.
According to such a method for manufacturing a dust collecting filter, for example, it is possible to easily and inexpensively manufacture a dust collecting filter that is used for filtering an air flow from the outside to the inside. These actions and effects are easily exhibited by the dust collecting filter manufacturing apparatus having a simple structure as shown in the present embodiment. That is, if the dust collecting filter manufacturing apparatus is structured as shown in this embodiment, the manufacturing cost of the apparatus can be reduced.

  6 (a) and 6 (b) show three heating tools 5a to 5c and two heating tools 5a and 5b, respectively. For example, these are one heating of a structure formed integrally with each other. It may be a tool. Further, the heating tools 5a to 5c may have a structure in which electric heating lines (not shown) are respectively incorporated and can generate heat individually as in the second embodiment.

  As described above, the invention described in claims 1 to 7 is not limited to the dust collecting filter, and is used when the ends of a sheet or a film made of a thermoplastic resin are overlapped and heat-sealed. Applicable.

It is a perspective view which shows a part of external appearance of Example 1 of the filter production apparatus for dust collection which concerns on embodiment of this invention. (A) And (b) is the partial side view of the filter manufacturing apparatus for dust collection of Example 1, and the side view of a heating means, respectively. (A) is the external appearance perspective view of the filter cloth which shows the state guided by the guide member, (b) is the external appearance perspective view of a holder, (c) is the filter cloth which shows the state in which the holder was installed FIG. (A) is the figure which expanded FIG. 2 (a) partially, (b) And (c) is the elements on larger scale which show the filter cloth cross section of an edge part vicinity. (A) is a side view of the heating means in the dust collection filter manufacturing apparatus of Example 2, (b) And (c) is the elements on larger scale which show the filter cloth cross section near an edge part. (A) And (b) is a side view of the heating means in the filter manufacturing apparatus for dust collection of Example 3, (c) and (d) are the elements on larger scale which show the filter cloth cross section of an edge part vicinity.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Main body 2 ... Filter cloth 2a, 2b ... End part 2c ... End surface 3 ... Table 4a, 4b ... Guide member 5a-5c ... Heating tool 6a, 6b ... Roller 7a, 7b ... Cable 8a, 8b ... Joining surface 9 ... Heat insulation Plate 10 ... Position adjusting means 11 ... Holder 11a, 11b ... Convex surface AC ... Arrow

Claims (7)

  In a dust collecting filter manufacturing apparatus that heat-seals two ends of a filter cloth made of a thermoplastic resin in two layers, a table on which the filter cloth is placed, and a conveying means for conveying the filter cloth And a heating means installed in the vicinity of the joining surface (surface to be heat-sealed) of the end portion and the end face and melting the joining surface and the end face, and the filter cloth installed downstream of the heating means. And a pressurizing means for pressurizing the end portion including the joint surface and the end surface.   The pressurizing means includes a pair of rollers that are respectively installed at substantially symmetrical positions with the filter cloth interposed therebetween so as to be able to change the distance between them, and press the end portion through the filter cloth. The dust collecting filter manufacturing apparatus according to claim 1.   A holder having a substantially S-shaped side view having two continuous convex surfaces is provided, and the holder is arranged such that one of the convex surfaces is disposed between the end portions stacked in two layers. 3. The dust collecting filter manufacturing apparatus according to claim 1, wherein the dust collecting filter manufacturing apparatus is installed upstream of the heating means.   4. The heating device according to claim 1, further comprising: a first heating tool and a second heating tool that individually heat the joining surface and the end surface of the end portion, respectively. 5. The filter for dust collection manufacturing described in 1.   The filter cloth is formed in a cylindrical shape so that the end portions on both sides are folded to the center side and overlapped in two layers, and the second heating tool is installed close to the end surface of the end portion of the inner layer. The dust collecting filter manufacturing apparatus according to claim 4.   In the manufacturing method of the dust collection filter which heat-seals the edge part of the filter cloth which consists of a thermoplastic resin on two layers, the joining surface (surface to be heat-sealed) while conveying the filter cloth And a step of heating and melting the end surface, and a step of pressing the end portion including the end surface and the joint surface through the filter cloth. Folding the ends on both sides of the filter cloth made of thermoplastic resin to the center and forming it in a cylindrical shape so as to overlap two layers, and joining surfaces of the ends while transporting the filter cloth (The surface to be heat-sealed), at least a step of heating and melting the end surface of the end portion on the inner layer side, and a step of pressing the end portion including the joining surface and the end surface through the filter cloth A method for manufacturing a filter for dust collection, comprising: