JP4886973B2 - Heat resistant conveyor belt - Google Patents

Description

  The present invention relates to a heat-resistant conveyor belt in which both end portions along the longitudinal direction of an endless belt body are improved.

  As is well known, conveyor belts using a belt base material (belt body) made of a heat-resistant fiber woven fabric impregnated with fluororesin dispersion, dried and fired make the most of its heat resistance and non-adhesiveness. It is used in various heat treatment processes in various industrial fields such as food heat treatment, freezing, thawing treatment or heat treatment of electronic parts. However, when manufacturing a belt having a predetermined width, it is necessary to cut the belt main body to a predetermined width, and at that time, the fibers constituting the woven fabric as the belt base material are exposed at both ends. It becomes a state.

Therefore, when a conveyor belt is manufactured from the belt body as it is and the running operation is performed, (1) warp fibers of the heat-resistant fiber cloth are frayed or fiber filaments are fuzzed and cut. There are problems such as being discrete, and (2) the belt being easily torn from the end. Therefore, conventionally, a method of wrapping the both ends of the belt with a material equivalent to that of the belt body, that is, a material in which a heat-resistant fiber woven cloth is coated with a fluororesin, and heat-sealing to protect / reinforce is used. FIG. 6 shows an example thereof, FIG. 6 (A) shows a schematic plan view of the heat-resistant conveyor belt 1, and FIG. 6 (B) shows a sectional view taken along line XX of FIG. 6 (A). . Reference numeral 2 in the figure indicates an endless belt body. Here, the belt body 2 is obtained by impregnating a heat-resistant fiber woven fabric with a fluororesin dispersion, drying and firing. At both ends of the belt body 2 along the longitudinal direction, a fluororesin coating material 3 having a U-shaped cross section is provided by heat sealing. The following Patent Document 1 discloses a sheet-like belt in which a reinforcing material is coated with a uniform thickness by dipping on both front and back surfaces and end surfaces of both end portions in the width direction of an endless belt body. It is.
JP-A-8-85645

However, the conveyor belt described above has the following problems (1) to (3).
(1) The portion of the heat-sealed coating material 3 becomes harder than the belt body 2 and is bent when the belt is running to cause wrinkles in the width direction of the belt body 2. And tend to tear.
(2) The covering material 3 generally has a small amount of the fluororesin covered and has irregularities on the surface. Therefore, the surface of the coated covering material 3 is worn and the fibers are exposed and peeled off. In particular, when a belt is used for heat treatment of foods and the like, there is a problem that the fibers are mixed into the processed material.

  (3) The heat-resistant conveyor belt 1 generally needs to prevent meandering, and as an example of the method, it may be used in a state as shown in FIG. Reference numeral 5 in the drawing denotes a roll having guide grooves 6 formed on the peripheral surface. The conveyor belt 1 travels in a state in which a string 4 provided inside the belt 1 is fitted in a guide groove 6 of a roll 5. However, also in this case, the portion provided with the covering material 3 becomes hard, and the thread 7 on which the string 4 is sewn is cut by bending while the belt is running, and the string 4 tends to come off.

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a heat-resistant conveyor belt that can prevent the occurrence of folding wrinkles and prevent the fibers constituting the coating material from peeling off due to wear. And

  In addition, the present invention has a disadvantage that when the string is sewed with the heat resistant fiber thread as one of the meandering prevention means inside the belt main body where the covering material is located, the string is dropped due to the heat resistant fiber thread being cut. It is an object to provide a heat-resistant conveyor belt that can improve the temperature.

The heat-resistant conveyor belt of the present invention includes an endless belt body obtained by impregnating a fluororesin dispersion into a heat-resistant fiber woven fabric, drying, and firing, and an adhesive layer so as to wrap both ends of the belt body. A heat-resistant resin covering material having a U-shaped cross section provided , wherein the adhesive layer is a PFA film or a PFEP film, and the covering material is a single fluororesin film or a polyimide film .

  According to the heat resistant conveyor belt of the present invention, it is possible to prevent the occurrence of folding wrinkles and to prevent the fibers constituting the coating material from peeling off. In addition, according to the heat-resistant conveyor belt of the present invention, it is possible to improve the inconvenience that the meandering-preventive string falls off.

  Hereinafter, the heat-resistant conveyor belt of the present invention will be described in more detail.

  The inventors of the present invention conducted research on the conventional conveyor belt and found the following. That is, for the covering material at the end of the conveyor belt, a material reinforced with fibers is used from the viewpoint of emphasizing the strength of the covering material in order to improve the tear resistance of the belt end. As a result, the belt end portion (reinforcement portion) covered with the covering material becomes hard, and the phenomenon that wrinkles occur in the width direction of the conveyor belt has occurred. Further, in a conveyor belt configured to sew a meander-preventing string on the back side of the reinforcing portion with a heat-resistant fiber thread, the heat-resistant fiber thread may be broken or the fibers constituting the covering material may be worn out. This causes a problem that the belt is mixed into a processed product in which the belt is used.

  Therefore, the present inventors said that there is a material that does not contain fibers, is flexible, has good wear resistance, and has heat resistance equivalent to that of a belt body that is a fluororesin-coated heat-resistant fiber woven fabric. In order to solve the above problems based on the idea, intensive studies and tests were conducted.

  In the present invention, a commercially available fabric can be used as the heat resistant fiber woven fabric constituting the belt body. Specific examples of the heat resistant fiber constituting the heat resistant fiber woven fabric include glass fiber, aramid fiber, carbon fiber and alumina fiber. Here, glass fiber cloth is generally used because it is easy to handle and has many types. Examples of the fluororesin that is a covering material for the belt main body include ethylene tetrafluoride resin (PTFE resin), tetrafluoroethylene-hexafluoropropylene copolymer (PFEP), and tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer. Although a coalesced resin (PFA resin) and a tetrafluoroethylene-ethylene copolymer (PETFE) can be mentioned, it is common to use a PTFE resin because of its wide variety.

  In the present invention, as the single fluororesin film as the covering material, for example, PTFE resin skived film, modified PTFE resin skived film, PTFE unfired tape, PFA melt extruded film, PFEP melt extruded film and PETFE melt extruded film Can be mentioned. The modified PTFE resin according to the present invention means a case where the modified comonomer is modified to 1% by mass or less (see Japanese Industrial Standard 6935-1), for example, trade name: M manufactured by Daikin Industries, Ltd. -111 and M-112 are mentioned, but not limited thereto.

  In the case of the PTFE resin skived film and the modified PTFE resin skived film, the film thickness used is preferably 0.025 to 0.3 mm, more preferably 0.05 to 0.20 mm. Here, when the thickness of the film is less than 0.025 mm, there is a problem in strength, and when it is thicker than 0.3 mm, it is difficult to wrap as a coating material, and the coating with the processed coating material is difficult. The part becomes hard.

  When the PTFE resin or modified PTFE resin skived film is wrapped in a belt body, a PFA or PFEP film having a thickness of 0.025 mm is used as an adhesive layer for heat fusion between the belt body and the covering material. It is preferable to use it. On the other hand, in the case of a PFA melt-extruded film, a PFEP melt-extruded film, and a PETFE melt-extruded film, the film thickness used is preferably 0.025 to 0.2 mm. Here, when the thickness is less than 0.025 mm, there is a problem in strength, and when the thickness exceeds 0.2 mm, the film becomes hard and it is difficult to wrap the belt body. Further, when the PTFE green tape is used, one having a thickness of 0.05 to 0.3 mm is preferably used.

  In the present invention, a polyimide film can be suitably used as the covering material. As the polyimide film, for example, a commercially available DuPont product name: Kapton, Ube Industries, Ltd. product name: Upilex and other double-sided fluororesin film-coated products, or double-sided fluororesin-coated products can be used. It is not limited. As the thickness of the polyimide film, 0.013 mm to 0.05 mm is preferably used. Here, when the thickness is less than 0.013 mm, there is a problem in strength, and when it exceeds 0.05 mm, it becomes hard and it is difficult to wrap the belt body.

  As already described with reference to FIG. 6, as described above with reference to FIG. 6, as a form of use of the heat-resistant conveyor belt, a string for preventing meandering is provided on the inner side of the covering material. It may be attached while being sewn with fiber thread. In this case, as the string, a braid or a braid manufactured by braiding a heat-resistant and high-strength fiber yarn is used. Moreover, as a string thread, an aramid fiber, which is a heat-resistant and high-strength fiber thread, is usually used because of its high strength.

  The covering material of the present invention is attached to the belt body as follows. That is, FIG. 7 shows a state where the clip 52 is fixed to the belt main body 22 every 50 cm through the covering material 51 before processing. The clip 52 is removed before pressing. FIG. 8 shows a processing method of the covering material 51, FIG. 8 (A) is a side view of a roll, a belt and the like, and FIG. 8 (B) is a plan view. As shown in FIG. 8, a cooling press board 53 and a hot press board 54 are arranged along the press traveling direction (arrow X direction) in an area where the belt body and the covering material overlap.

  That is, for example, when using a PTFE skived film as a coating material, first, a skived film having a predetermined width and a PFA film having the same width as an adhesive layer are cut, and then the film is sky-cut by a manual iron (340 ° C.). A PFA film is temporarily bonded to the bud film to produce a covering material 51, which is bent in half as shown in FIG. Next, the coating is folded by the hot press board 54 and the cooling press board 53 arranged adjacent to the end along the longitudinal direction of the belt body 22 while winding the belt body 22 between the two rolls 55 and 56. The material 51 is held at, for example, a temperature of 375 ° C. and a pressure of 0.49 MPa for 10 seconds, and bonded at a pitch of 50 mm, so that the covering material 51 is wrapped around the end of the belt body 22 along the longitudinal direction. In FIG. 8B, the hatched portion S is a fused portion, and the coating agent 51 that has passed through the hot press disk 54 is fused so as to wrap the end portion along the longitudinal direction of the belt main body 22.

  Next, for the purpose of comparing the wear resistance of various coating materials according to the present invention with a conventional coating material, in order to obtain a sample close to the state of the coating material that also serves as an actual reinforcement, the belt body and the coating material are The following various coating material samples 1 to 6 according to the present invention and comparative samples 1 and 2 according to conventional coating materials were manufactured.

(Sample 1)
First, PTFE-covered aramid fiber woven fabric (trade name: FAF500-14, manufactured by Chukoh Chemical Industry Co., Ltd.), which is the belt body, is cut out with a width of 300 mm and a length of 1000 mm, and PTFE resin (trade name) that functions as a coating on both sides : T-7AJ: manufactured by Mitsui Dupont Fluoro Chemical Co., Ltd.), two skived films with a thickness of 0.05 mm, a width of 300 mm, and a length of 1000 mm, a thickness of 0.025 mm, a width of 300 mm, and a length that function as an adhesive layer Two PFA films having a thickness of 1000 mm were prepared, and a skived film, a PFA film, a PTFE-coated aramid fiber woven fabric, a PFA film, and a skived film were stacked in this order, and the aggregate was inserted between the hot press panel surfaces to obtain a surface pressure of 0.1 mm. State where surface pressure is maintained at 0.49 MPa with a cooling press through which cooling water is passed after heat fusion at 49 MPa and 375 ° C. It held until 30 ° C., to obtain a width 300 mm, laminate length 1000mm (Sample 1).

(Sample 2)
A skived film having a thickness of 0.050 mm manufactured from PTFE resin (trade name: T-7AJ, manufactured by Mitsui DuPont Fluoro Chemical Co., Ltd.) is used as a modified PTFE resin (trade name: M-112, manufactured by Daikin Industries, Ltd.). A laminated body (sample 2) having a width of 300 mm and a length of 1000 mm was obtained under the same conditions as sample 1 except that a PFA film functioning as an adhesive was not used in place of the film (thickness 0.050 mm).

(Sample 3)
A skived film with a thickness of 0.050 mm manufactured from PTFE resin (trade name: T-7AJ, manufactured by Mitsui DuPont Fluorochemical Co., Ltd.) was replaced with a polyimide film (trade name: Iupirec 25RCB01F [both sides of a polyimide film with a thickness of 0.025 mm). Instead of using a film that functions as an adhesive, a laminate (sample 3) having a width of 300 mm and a length of 1000 mm was obtained under the same conditions as in sample 1.

(Sample 4)
A laminate (sample 4) having a width of 300 mm and a length of 1000 mm was obtained under the same conditions as in sample 3, except that the polyimide film was replaced with a 0.1 mm thick PFA film.

(Comparative sample 1)
A skived film with a thickness of 0.050 mm made from PTFE resin (trade name: T-7AJ, manufactured by Mitsui DuPont Fluoro Chemical Co., Ltd.) is used as a PTFE-coated glass fiber woven fabric (trade name: FGF502-6, manufactured by Chuko Kasei Kogyo). A laminated body (Comparative Sample 1) having a width of 300 mm and a length of 1000 mm was obtained under the same conditions as Sample 1 except that the sample was replaced.

(Comparative sample 2)
A skived film with a thickness of 0.050 mm made from PTFE resin (trade name: T-7AJ, manufactured by Mitsui DuPont Fluoro Chemical Co., Ltd.) is used as a PTFE-coated aramid fiber woven fabric (trade name: FAF502-6, manufactured by Chuko Kasei Kogyo). A laminated body (Comparative Sample 2) having a width of 300 mm and a length of 1000 mm was obtained under the same conditions as Sample 1 except that the sample was replaced.

(Abrasion resistance test)
Wear resistance test in accordance with JIS-K-7204 using test pieces cut from the laminates obtained in Samples 1 to 4 (equivalent to the present invention) and Comparative Samples 1 and 2 (equivalent to conventional products) Carried out. The results are shown in Table 1 below.

Next, specific Examples 1 to 4 and Comparative Examples 1 and 2 relating to the conveyor belt according to the present invention will be described.
Example 1
Reference is made to FIGS. Here, FIG. 1 (A) shows a schematic plan view of the heat-resistant conveyor belt, FIG. 1 (B) is a sectional view taken along line XX of FIG. 1 (A), and FIG. 1 (C) is a heat-resistant conveyor. Sectional drawing of the belt main body which is one structure of a belt is shown.

  The heat-resistant conveyor belt 21 according to the first embodiment includes an endless belt body 22 and a covering material 23 made of a fluororesin having a U-shaped cross section provided by heat fusion at both ends along the longitudinal direction of the belt body 22. It consists of and. A PFA film 25 as an adhesive is used between the belt body 22 and the covering material 23.

  As shown in FIG. 1C, the belt main body 22 includes an aramid fiber woven fabric (heat-resistant fiber woven fabric) 27 composed of warp yarns 27a and weft yarns 27b, and PTFE formed on both surfaces of the aramid fiber woven fabric 27. A PTFE-coated aramid fiber woven fabric (trade name: FAF500-14, manufactured by Chuko Kasei Kogyo Co., Ltd.) made of a resin (fluororesin) layer 28 is used. The belt body 22 is obtained by impregnating an aramid fiber woven fabric with a PTFE resin dispersion, drying, and firing. Here, the belt body 22 has a width of 100 mm and a length of 1200 mm. As the covering material 23, a skived film (SK) having a thickness of 0.050 mm, a width of 40 mm, and a length of 1200 mm manufactured from PTFE resin (trade name: T-7AJ, manufactured by Mitsui DuPont Fluorochemical Co., Ltd.) is used. Yes.

The heat-resistant conveyor belt having the configuration shown in FIG. 1 was manufactured as follows.
First, a PTFE-coated aramid fiber woven fabric (belt body) 22 was cut into a width of 100 mm and a length of 1200 mm, and a skived film (covering material) 23 having a thickness of 0.050 mm, a width of 40 mm, and a length of 1200 mm manufactured from the PTFE resin. Two sheets of PFA film 25 having a thickness of 0.0250 mm, a width of 40 mm, and a length of 1200 mm that function as an adhesive were prepared. Next, as shown in FIG. 1 (B), the PTFE-coated aramid fiber woven fabric 22 is encased and reinforced with a PFA film 25 as an adhesive, with a covering material 23, as shown in FIG. 21 was produced.

  The heat-resistant conveyor belt according to Example 1 has a configuration in which both end portions along the longitudinal direction of the belt main body 22 are heat-sealed with the covering material 23 having a U-shaped cross section through the PFA film 25. Therefore, compared with the conventional conveyor belt of the structure heat-sealed with the same kind of coating material as the belt main body containing the fibers, the coating material 23 is more flexible, so that the coating portion is less likely to become hard. As a result, it is possible to prevent the occurrence of folding wrinkles that have conventionally occurred in the belt width direction due to the difference in hardness between the belt main body and the covering portion. In addition, since the coating material itself does not contain fibers, and because it has superior wear resistance compared to conventional coating materials, the surface of the coating material is worn and the fibers are exposed and peeled off as in the past. There is no, and it can prevent mixing of the fiber into a processed material.

(Example 2)
Compared to Example 1, a heat-resistant conveyor belt was produced in the same manner as in Example 1 except that a modified PTFE resin-made skived film (modified SK) was used instead of the skived film as a coating material. According to the heat resistant conveyor belt according to the second embodiment, the same effect as that of the first embodiment is obtained.

(Example 3)
Compared to Example 1, a heat-resistant conveyor belt was produced in the same manner as in Example 1 except that a PFEP-coated polyimide film was used instead of SK as the coating material. According to the heat resistant conveyor belt according to the third embodiment, the same effect as that of the first embodiment is obtained.

Example 4
Compared with Example 1, a heat-resistant conveyor belt was produced in the same manner as in Example 1 except that a PFA film was used instead of SK as a coating material. According to the heat resistant conveyor belt according to the fourth embodiment, the same effects as those of the first embodiment are obtained.

(Comparative Example 1)
Compared to Example 1, the heat-resistant conveyor belt is the same as Example 1 except that PTFE-coated glass fiber woven fabric (trade name: FGF502-6: manufactured by Chuko Kasei Kogyo Co., Ltd.) is used instead of SK as the coating material. Was made.

(Comparative Example 2)
Compared to Example 1, the heat-resistant conveyor belt is the same as Example 1 except that PTFE-coated aramid fiber woven fabric (trade name: FAF502-6, manufactured by Chuko Kasei Kogyo) is used instead of SK as the coating material. Was made.

(Bend resistance test)
This will be described with reference to FIGS. 2, 3 and 4. As shown in FIG. 2, the test machine used in this test includes a drive motor 42 for reciprocating the test sample 41, a furnace 43 for heating and maintaining the temperature of the test sample 41, and tensioning the test sample. A weight 44 for feeding and three rolls 45, 46 and 47 arranged in the furnace 43 for bending the test sample 41 are configured. In such a testing machine, the test sample 41 heated and maintained in the furnace 43 by the motor 42 is reciprocated through the rolls 45 to 47 to bend the test sample 41.

Using the testing machine as described above, the test sample 41 obtained in Examples 1 to 4 and Comparative Examples 1 and 2 was bent 5 million times, and then the state of the coating material was observed. The results are shown in Table 2 below.

However, the test conditions were: roll diameter: φ50 mm, furnace set temperature: 200 ° C., test sample tension: 0.5 kg / cm, string: fluorinated resin impregnated aramid string (trade name: CS-B, Chuko Kasei Kogyo ( Co., Ltd.).

  Samples 1 to 4 and Comparative Samples 1 and 2 of the wear resistance test assumed the configuration of an enveloping portion where the heat-resistant conveyor belt of the present invention is applied along the longitudinal direction of both ends. That is, it is a sample having a configuration in which various coating materials are laminated on the top and bottom of the belt body (base material). In addition, the test samples of the bending test examples 1 to 4 and the comparative examples 1 and 2 are processed by wrapping both ends with a covering material corresponding to the wear resistance test samples 1 to 4 and the comparative samples 1 and 2, and the processed parts thereof. This is a test sample to which a string for preventing meandering is attached.

  From the results of the abrasion resistance test, the heat-resistant conveyor belt wrapped at both ends according to the present invention has a wrapping portion compared to the conventional heat-resistant conveyor belt wrapped with the coating materials of Comparative Examples 1 and 2. Excellent wear resistance. Further, according to the bending test, the heat-resistant conveyor belt according to the present invention of Examples 1 to 4 using the coating material corresponding to the abrasion resistance test samples 1 to 4 is the coating material corresponding to the comparative samples 1 and 2. Compared to the conventional heat-resistant conveyor belts of Comparative Examples 1 and 2 using No. 1, there was no peeling of the reinforcing material, so it was confirmed that the wrapping portion was excellent in flexibility. Thus, according to the present invention, there is provided a heat-resistant conveyor belt capable of preventing the generation of folding wrinkles due to the flexibility of the enveloping part by the covering material and preventing the fibers constituting the covering material from peeling off due to wear. it can.

(Example 5)
Reference is made to FIGS. Here, FIG. 9 (A) shows a schematic plan view of the heat-resistant conveyor belt, FIG. 9 (B) is a sectional view taken along line XX of FIG. 9 (A), and FIG. 9 (C) is a heat-resistant conveyor. Sectional drawing of the belt main body which is one structure of a belt is shown. The conveyor belt according to the fifth embodiment has the same configuration as the conveyor belt according to the first embodiment except that a string (cord) and a thread for preventing belt meandering are provided. To do.

  The heat-resistant conveyor belt 21 according to the fifth embodiment includes an endless belt body 22 and a covering material 23 made of a fluororesin having a U-shaped cross section provided by heat sealing at both ends along the longitudinal direction of the belt body 22. And a belt 24 for preventing meandering of the belt provided inside the belt body 22 where the covering material 23 is located. The string 24 is sewn to the belt body 22 and the like with a thread 26 at a distance of 80 mm between the strings. Here, the distance between the strings indicates the distance between the strings at both ends, that is, the distance L between the centers of the two strings.

  As shown in FIG. 9C, the belt main body 22 includes an aramid fiber woven fabric (heat resistant fiber woven fabric) 27 composed of warp yarns 27a and weft yarns 27b, and PTFE formed on both surfaces of the aramid fiber woven fabric 27. A PTFE-coated aramid fiber woven fabric (trade name: FAF500-14, manufactured by Chuko Kasei Kogyo Co., Ltd.) made of a resin (fluororesin) layer 28 is used. As the string 24, a fluorine resin-impregnated aramid string (trade name: CS-B, manufactured by Chukoh Chemical Industry Co., Ltd.) is used. Further, as the yarn 26, an aramid fiber yarn (trade name: Technora yarn ESF-1001, manufactured by Teijin Ltd.) is used.

The heat-resistant conveyor belt having the configuration shown in FIG. 9 was manufactured as follows.
First, a PTFE-coated aramid fiber woven fabric (belt body) 22 was cut into a width of 100 mm and a length of 1200 mm, and a skived film (covering material) 23 having a thickness of 0.050 mm, a width of 40 mm, and a length of 1200 mm manufactured from the PTFE resin. Two sheets of PFA film 25 having a thickness of 0.0250 mm, a width of 40 mm, and a length of 1200 mm that function as an adhesive were prepared. Next, as shown in FIG. 10 (B), the PTFE-coated aramid fiber woven fabric 22 was reinforced by enveloping with a width of 20 mm with the skived film 23 using the PFA film 25 as an adhesive. Subsequently, the lace 24 was sewn with an aramid fiber thread 26 at a distance of 80 mm between the ends of the aramid fiber woven fabric 22 where both ends were wrapped and heat-sealed, and a heat-resistant conveyor belt 21 was produced.

  The heat-resistant conveyor belt according to Example 5 has a configuration in which both end portions along the longitudinal direction of the belt main body 22 are heat-sealed with the covering material 23 having a U-shaped cross section through the PFA film 25. Therefore, compared with the conventional conveyor belt of the structure heat-sealed with the same kind of coating material as the belt main body containing the fibers, the coating material 23 is more flexible, so that the coating portion is less likely to become hard. As a result, it is possible to prevent the occurrence of folding wrinkles that have conventionally occurred in the belt width direction due to the difference in hardness between the belt main body and the covering portion. In addition, since the coating material itself does not contain fibers, and because it has superior wear resistance compared to conventional coating materials, the surface of the coating material is worn and the fibers are exposed and peeled off as in the past. There is no, and it can prevent mixing of the fiber into a processed material.

(Comparative Example 3)
First, a PTFE-coated aramid fiber woven fabric (trade name: FAF500-14: Chuko Kasei Kogyo Co., Ltd., width 100 mm, length 1200 mm) is cut out and used as a coating material, a PTFE-coated glass fiber weave 40 mm wide and 1200 mm long Two sheets of cloth (trade name: FGF502-6: manufactured by Chukoh Chemical Industry Co., Ltd.) and two PFA films having an adhesive of 0.025 mm, a width of 40 mm, and a length of 1200 mm were prepared. Next, the PTFE-coated aramid fiber woven fabric was wrapped and heat-sealed in a width of 20 mm with the PTFE-coated glass fiber woven fabric through a PFA film as an adhesive agent at both ends in the width direction. Subsequently, a fluororesin-impregnated aramid string (code) used for the purpose of preventing belt meandering (code) (trade name: CS-B, manufactured by Chukoh Chemical Industry Co., Ltd.) ) Is sewed with an aramid fiber yarn (manufactured by Teijin Ltd., trade name: Techno-Layan ESF-1001) at a distance of 80 mm between the cords, and a heat-resistant conveyor belt having the structure shown in FIG. 9 is produced.

(Comparative Example 4)
Except for using PTFE-coated aramid fiber woven fabric (trade name: FAF502-6, manufactured by Chuko Kasei Kogyo) instead of PTFE-coated glass fiber woven fabric (trade name: FGF502-6, manufactured by Chuko Kasei Kogyo) as the covering material. In the same manner as in Comparative Example 1, a heat-resistant conveyor belt having the configuration shown in FIG.

(Bend resistance test)
This will be described with reference to FIGS. 2, 10 and 11. In this test, a testing machine as shown in FIG. 2 is used.
In this case, as shown in FIGS. 10 and 11, the test sample 41 is bent in a state where the side on which the cord (cord) 24 is attached faces outward. That is, the roll 46 is grooved so that the string 24 can travel. As shown in FIG. 11, the string 24 is fixed to the belt body 22 with an aramid fiber (trade name: Techno-Layan ESF-1001, manufactured by Teijin Limited) 26.

Using the testing machine as described above, the test sample 41 obtained in Example 5 and Comparative Examples 3 and 4 and used for the purpose of preventing meandering is sewn and fixed with a thread and fixed 120,000 times. After bending (720,000 times), the attached string 24 and the state of the sewing thread 26 to which the string 24 was attached were observed. The results are shown in Table 3 below.

However, the test conditions were: roll diameter: φ50 mm, furnace set temperature: 200 ° C., test sample tension: 0.5 kg / cm, string: fluorinated resin impregnated aramid string (trade name: CS-B, Chuko Kasei Kogyo ( Co., Ltd.).

  Sample 1 and Comparative Samples 1 and 2 of the wear resistance test assumed a configuration of an enveloping portion where the heat-resistant conveyor belt of the present invention is applied along the longitudinal direction of both ends. That is, it is a sample having a configuration in which various coating materials are laminated on the top and bottom of the belt body (base material). Further, the test samples of the bending test example 5 and the comparative examples 3 and 4 are processed by wrapping both ends with a covering material corresponding to the wear resistance test sample 1 and the comparative samples 1 and 2, and for preventing meandering in the processed part. This is a test sample with a string attached.

  Therefore, from the results of the abrasion resistance test, the heat-resistant conveyor belt wrapped at both ends according to the present invention is compared with the conventional heat-resistant conveyor belt wrapped and wrapped with the coating material of Comparative Examples 3 and 4. The enveloping part has excellent wear resistance. Further, according to the bending test, the heat-resistant conveyor belt according to the present invention of Example 5 using the coating material corresponding to the abrasion resistance test sample 1 is compared using the coating material corresponding to the comparative samples 1 and 2. Compared to the conventional heat-resistant conveyor belts of Examples 3 and 4, since there was no cutting of the string fixing sewing thread for preventing meandering, it was confirmed that the wrapping portion was excellent in flexibility. Thus, according to the present invention, there is provided a heat-resistant conveyor belt capable of preventing the generation of folding wrinkles due to the flexibility of the enveloping part by the covering material and preventing the fibers constituting the covering material from peeling off due to wear. it can.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably.

Structure explanatory drawing of the heat resistant conveyor belt of this invention. Schematic of a bending test apparatus. Explanatory drawing which shows the mounting state to the testing machine of the bending-proof test sample in a furnace. Explanatory drawing for showing the positional relationship of a bending-proof test material and a roll. The perspective view which shows the usage method of the heat resistant conveyor belt of FIG. Explanatory drawing of the conventional heat resistant conveyor belt. Explanatory drawing which shows a mode that an ear reinforcement material is fixed before the process which wraps the both ends of a belt main body with a coating | covering material. Explanatory drawing which shows the mode at the time of the process which wraps the both ends of a belt main body with a coating | covering material. Structure explanatory drawing of the other heat resistant conveyor belt of this invention. Explanatory drawing which shows the mounting state to the testing machine of the bending-proof test sample in a furnace. Explanatory drawing for showing the positional relationship of a bending-proof test material and a roll. The perspective view which shows the usage method of the heat resistant conveyor belt of FIG.

Explanation of symbols

21 ... Heat-resistant conveyor belt, 22 ... Belt body, 23 ... Covering material,
24 ... string (code), 25 ... PFA film, 26 ... thread,
27 ... Aramid fiber woven fabric (heat resistant fiber woven fabric), 27a ... Warp, 27b ... Weft,
28: PTFE resin layer.

Claims (3)

An endless belt body formed by impregnating a fluororesin dispersion into a heat-resistant fiber woven fabric, drying, and firing,
A heat-resistant resin covering material having a U-shaped cross section provided through an adhesive layer so as to wrap around both ends of the belt body ,
The heat-resistant conveyor belt, wherein the adhesive layer is a PFA film or a PFEP film, and the covering material is a single fluororesin film or a polyimide film . The heat-resistant conveyor belt according to claim 1, wherein the single fluorine resin film is a PTFE resin skived film or a modified PTFE skived film, and the thickness of the film is 0.025 to 0.3 mm. The elemental fluorine resin film is PFA melt-extruded film is either PFEP melt extruded film and PETFE melt-extruded film, according to claim 1, wherein the thickness of the film is 0.025~0.2mm Heat resistant conveyor belt.

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