JP6527458B2 - Conveyor belt and method of manufacturing the same - Google Patents

Description

  The present invention relates to a conveyor belt for conveying articles and a method of manufacturing the same.

  In a conveyer belt for conveying an adhesive conveyed product (article) such as bread or confectionery dough, the core canvas is used as a conveyance surface in order to make it difficult for the conveyed product to adhere to the conveyance surface of the conveyer belt. In some cases, a conveyor belt is adopted in which good peelability is obtained by the unevenness (woven pattern) of the core canvas.

  Also, in general, in order to make it easy to understand the position of the conveyed product, the contents of processing, etc., the conveyance belt displays positioning marks, marks for PR, marks such as trademarks and specifications, etc. (graphics, lines, characters) on the conveyance surface. Sometimes.

  Conventionally, such marks have been displayed by a method such as drawing directly on the transport surface by ink jet printing, or welding a thermoplastic resin sheet (film) on which the marks are drawn in advance (see Patent Document 1).

Japanese Utility Model Publication No. 2-69610 Japanese Patent Application Laid-Open 7-309414 JP 2000-7119 A

  However, since the adhesion of the ink or film to the uneven conveyance surface such as the core canvas is low, peeling of the ink or film occurs during conveyance, and they adhere to the conveyance as foreign matter and are mixed. It may occur. In particular, it can be a big problem in food processing processes such as bread and confectionery dough.

  Moreover, in patent document 2, the tension body and an elastomer sheet are laminated, the mark which comprised the dot was printed on the surface of the elastomer sheet, and the conveyance belt which further laminated | stacked the transparent sheet on it is disclosed. In this way, by making the marks dot-printed, the contact area per unit area between the mark (ink layer) and the transparent sheet is reduced (= the contact area of the transparent sheet and the elastomer layer is increased). It is made to be able to prevent the fall of the adhesive force with an elastomer sheet.

However, since the contact portion between the mark (ink layer) and the transparent sheet is present also in this transport belt, the transparent sheet may be peeled off at that portion.
Furthermore, since the transparent sheet on the transport surface (belt surface) is a resin material such as urethane, there is a problem that the releasability is poor when the adhesiveness of the transported object is high.

  Further, in Patent Document 3, a running direction indication of a color different from the surface rubber or resin of the belt is embedded in the surface rubber or resin of the belt joint portion, and the running direction indication can be seen through the surface rubber or resin. A conveyor belt is disclosed. In this conveyance belt, since the traveling direction indication is embedded in the inside of the belt, peeling of the traveling direction indication and adhesion to the conveyed product can be prevented.

  However, since this method is a method of displaying the traveling direction only on the joint portion of the belt, it is not suitable for applications in which marks of various patterns are provided on the entire surface of the conveyance belt.

  Therefore, the present invention has a good releasability from a tacky transfer object such as bread or confectionery material, and can prevent the mark from being peeled off and adhering to the transfer object. Intended to provide a belt.

One of the present invention is a first core canvas layer having transparency and containing a canvas material,
A first resin layer laminated on the lower side of the first core canvas layer and having transparency and containing a resin;
A mark layer laminated under the first resin layer and including a mark for transmitting information to the outside;
It is a conveyance belt characterized by laminating a protective layer laminated under the above-mentioned mark layer.

According to the above configuration, by arranging the mark layer between the first resin layer and the protective layer, it is possible to prevent the mark layer from being in direct contact with the transported object and the like. Thereby, it is possible to prevent the mark layer from peeling off and adhering to or mixing with the conveyed product.
In addition, when the first core canvas layer and the first resin layer have transparency, the mark of the mark layer laminated on the upper side of the protective layer is externally passed through the first core canvas layer and the first resin layer. It can be viewed visually.
In addition, by adopting the canvas material for the first core canvas layer in direct contact with the conveyed product, it is possible to maintain good peelability for the conveyed product.

  Further, one of the present invention is characterized in that, in the above-mentioned transport belt, the protective layer is a second resin layer containing a resin.

  According to the above configuration, by arranging the mark layer between the first resin layer and the second resin layer, the mark layer can be sandwiched and held by the resin excellent in strength and processability. Thereby, the mark layer can be stably fixed between the first resin layer and the second resin layer.

  Further, one of the present invention is characterized in that, in the above-mentioned transport belt, the protective layer is a second core canvas layer containing a canvas material.

  According to the said structure, the upper side (surface on the side which contacts a conveyed product) and lower side of a conveyance belt can be covered by canvas material. Thereby, the strength and durability of the transport belt can be improved.

Further, according to one aspect of the present invention, in the above-described transport belt, the protective layer is laminated under the mark layer, and a second resin layer containing a resin,
And a second core canvas layer laminated on the lower side of the second resin layer and containing a canvas material.

  According to the above configuration, by arranging the mark layer between the first resin layer and the second resin layer, the mark layer can be sandwiched and held by the resin excellent in strength and processability. In addition, by covering the upper side (the surface on the side in contact with the conveyed product) and the lower side of the conveyance belt with the canvas material, the strength and durability of the conveyance belt can be improved.

  Moreover, one of the present invention is characterized in that, in the above-mentioned conveyance belt, the canvas material of the first core canvas layer is a fiber having a fineness of 280 to 1200 dtex.

If the fineness of the canvas material of the first core canvas layer is less than 280 dtex, the belt tension is low, and the transport belt may be slackened during conveyance, which may hinder the conveyance, and when the fineness exceeds 1200 dtex, The transparency of the first core canvas layer deteriorates and the visibility of the mark decreases.
Therefore, by making the canvas material constituting the first core canvas layer into a fiber with a fineness of 280 to 1200 dtex by the above configuration, it is possible to maintain good belt tension for transportation while securing the visibility of the mark. it can.

  Moreover, one of the present invention is characterized in that, in the above-mentioned conveyance belt, the thickness of the first core canvas layer is 0.2 to 0.8 mm.

If the thickness of the first core canvas layer is thinner than 0.2 mm, the strength and durability of the transport belt necessary for transporting the transported product can not be ensured, while if it is thicker than 0.8 mm, the first The transparency of the core canvas layer deteriorates and the visibility of the mark decreases.
Therefore, by setting the thickness of the first core canvas layer to 0.2 to 0.8 mm by the above configuration, the transport belt can maintain good strength and durability while securing the visibility of the mark. Can.

  Further, one of the present invention is characterized in that, in the above-mentioned transport belt, the first resin layer is a transparent thermoplastic elastomer or a transparent thermoplastic resin.

  According to the above configuration, it is possible to make the first resin layer excellent in processability and strength while securing the visibility of the mark disposed below the first resin layer.

  Further, one of the present invention is characterized in that, in the above-mentioned transport belt, the canvas material of the first core canvas layer contains white conductive fibers.

  According to the above configuration, the canvas material of the first core canvas layer contains white conductive fibers, whereby the transport belt can be made less likely to be charged without losing the visibility of the mark layer.

  Further, one of the present inventions is that, in the above-mentioned conveyor belt, the first core canvas layer contains the canvas material impregnated with an adhesive composed of a transparent thermoplastic elastomer or a transparent thermoplastic resin. It is characterized by

  According to the said structure, the adhesiveness of a 1st core canvas layer and a 1st resin layer can be improved, ensuring the visibility of the mark through a 1st core canvas layer.

  Further, one of the present invention is characterized in that, in the above-mentioned transport belt, the second resin layer is white.

  According to the above configuration, since the white second resin layer is disposed below the mark layer, the visibility of the mark can be improved.

In addition, one of the present invention is the mark layer formation which forms a mark layer by directly printing a mark transmitting information to the outside on the upper side of the second resin layer, or laminating a film on which the mark is printed. Process,
A first resin layer forming step of laminating a transparent first resin layer on the upper side of the mark layer;
And a first core canvas layer forming step of laminating a first core canvas layer having a transparency and containing a canvas material on the upper side of the first resin layer. It is.

According to the above method, the mark layer can be disposed between the first resin layer and the second resin layer, and the mark layer can be prevented from being in direct contact with the transported object or the like. As a result, it is possible to manufacture a transport belt capable of preventing the mark layer from being peeled off and adhering to the transported product.
In addition, when the first core canvas layer and the first resin layer have transparency, the mark of the mark layer laminated on the upper side of the second resin layer can be formed from the outside from the first core canvas layer and the first resin. A transport belt can be produced that can be viewed through the layers.
In addition, a canvas material can be used for the first core canvas layer in direct contact with the conveyed product to produce a conveyance belt having good releasability with respect to the conveyed product.

  Moreover, one of the present invention further includes a second core canvas layer forming step of laminating a second core canvas layer containing a canvas material on the lower side of the second resin layer in the method of manufacturing the transport belt. It is characterized by including.

  According to the above method, it is possible to manufacture a transport belt having the upper side (surface in contact with the transport object) and the lower side of the transport belt covered with the canvas material to improve the strength and durability of the transport belt.

Moreover, one of the present invention is a mark layer which forms a mark layer by directly printing a mark transmitting information to the outside under the first resin layer or laminating a film on which the mark is printed. Forming process,
A first core canvas layer forming step of laminating a first core canvas layer having transparency and containing a canvas material on the upper side of the first resin layer;
And a second core canvas layer forming step of laminating a second core canvas layer having a transparency and containing a canvas material on the lower side of the mark layer. is there.

According to the above method, it is possible to manufacture a transport belt having the upper side (surface in contact with the transport object) and the lower side of the transport belt covered with the canvas material to improve the strength and durability of the transport belt.
Moreover, a thin conveyance belt can be manufactured by using only a single resin layer.

  To provide a conveyor belt having good releasability from a tacky carrier such as bread or confectionery material, and capable of preventing marks from peeling off and adhering to the carrier. it can.

It is a schematic explanatory drawing of the conveyance belt which concerns on this embodiment. It is sectional drawing of the circumferential direction of the conveyance belt which concerns on 1st Embodiment. It is sectional drawing of the circumferential direction of the conveyance belt (with film) which concerns on 1st Embodiment. It is explanatory drawing of the manufacturing method of the conveyance belt which concerns on 1st Embodiment. It is explanatory drawing of the manufacturing method of the conveyance belt (with film) which concerns on 1st Embodiment. It is sectional drawing of the circumferential direction of the conveyance belt which concerns on 2nd Embodiment. It is explanatory drawing of the manufacturing method of the conveyance belt which concerns on 2nd Embodiment. It is sectional drawing of the circumferential direction of the conveyance belt which concerns on 3rd Embodiment. It is explanatory drawing of the manufacturing method of the conveyance belt which concerns on 3rd Embodiment. It is an explanatory view of a run test concerning an example. It is explanatory drawing of the test piece used by the sensory test of the visibility of a mark. It is a figure explaining the method of the sensory test of the visibility of a mark. It is a figure which shows the result of the sensory test of the visibility of a mark.

(Embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Conveying belt 1 outline)
The conveyance belt 1 according to the present embodiment is an endless flat belt, and as shown in FIG. 1, the conveyance belt 1 is wound around and used between a driving pulley 11 and a driven pulley 12. As a result, a conveyed product (article) such as a food such as bread or confectionery material can be placed on the surface of the conveying belt 1 and conveyed from the driven pulley 12 side to the driving pulley 11 side. In the present embodiment, an endless flat belt is described as an example of the transport belt, but an open end belt having both ends may be used.

First Embodiment
FIG. 2 shows a cross-sectional view of the conveyor belt 1 according to the first embodiment. In the conveyor belt 1 shown in FIG. 2, the upper surface side is the outer peripheral side on which the article is placed, and the lower surface side is the inner peripheral side (the surface side in contact with the drive pulley 11 and the driven pulley 12). The circumferential direction is 1 and the depth direction in the drawing is the width direction of the transport belt 1.

  As shown in FIG. 2, the conveyor belt 1 of the first embodiment includes a first core canvas layer 2, a first resin layer 4, and a mark layer 5 in order from the outer circumferential side to the inner circumferential side of the conveyor belt 1. The second resin layer 6 (protective layer) is formed as a laminated structure.

(First core canvas layer 2)
The first core canvas layer 2 is provided on the outermost surface of the conveyance belt 1 and serves as a conveyance surface in direct contact with the conveyance object. The first core canvas layer 2 is made of a canvas material impregnated with an adhesive 3. The canvas material is a woven fabric (plain weave, twill weave, satin weave, etc.) woven by crossing warp and weft yarns. It is used. For example, as a canvas material of the first core canvas layer 2, a plain weave cloth woven by crossing warp and weft at substantially right angles can be used.

  The first core canvas layer 2 is a canvas material so that the mark layer forming the marks described later has visible transparency from the transport surface side (the first core canvas layer side) (see FIG. 1). The material, size and density of the warp and weft, and the thickness of the first core canvas layer 2 are determined.

  As the material of the warp and weft, synthetic fibers such as polyester, vinylon, polylactic acid and polyurethane are used, but in order to enhance the transparency of the entire canvas, it is preferable to exhibit a transparent, semitransparent, and white appearance.

  When the warp and weft are multifilaments obtained by twisting filaments (long fibers) or a monofilament, the fineness (thickness of the yarn) of the warp and weft is preferably 280 to 1200 dtex (in the embodiment, the weft is 660 dtex). In addition, dtex (decitex) is what represented the mass of a 10,000-meter thread in a gram unit.

  When the warp and weft are spun yarns (spun yarns) obtained by twisting short fibers, the fineness (thickness of the yarn) is preferably 21 to 5 (in the embodiment, the warp is 20).

  If the fineness is less than 280 dtex (or 21st), the belt tension of the conveyance belt 1 is low, and the conveyance belt 1 may be slackened during conveyance, which may cause trouble in conveyance. When it exceeds the above, the transparency of the first core canvas layer is deteriorated and the visibility of the mark is lowered.

  The densities of the warp yarns and weft yarns are preferably 60-140 yarns / 5 cm (78 yarns in the embodiment) and 45-105 yarns / 5 cm (68 yarns in the embodiment), respectively.

  The thickness of the first core canvas layer 2 is 0.2 to 0.8 mm, preferably 0.25 to 0.6 mm. If the thickness of the first core canvas layer 2 is thinner than 0.2 mm, the strength and durability of the transport belt 1 necessary for transporting the transported object can not be ensured, while if it is thicker than 0.8 mm, This is because the transparency of the first core canvas layer 2 is deteriorated and the visibility of the mark is lowered.

  Furthermore, as a warp constituting the canvas material of the first core canvas layer 2, it is preferable to use a conductive warp in which conductive fibers are twisted. When the first core canvas layer 2 contains conductive fibers, the transport belt 1 can be made less likely to be charged. In addition, what twisted the conductive warp in the ratio of one for a plurality of normal warps is used as a warp. In addition, the conductive fiber is preferably white in order not to impair the visibility of the mark layer 5. By including conductive fibers in the fibers forming the first core canvas layer 2 in this manner, static electricity can be discharged and charging of the transport belt 1 can be prevented.

Here, as the conductive fiber, polyester conductive fiber or conductive carbon may be kneaded into polyester fiber, for example, fiber having a fineness of 28 dtex (twisting of two strands) and wire resistance of 10 ⁷ Ω / cm or less can be used. . Specifically, when twisting the warp constituting the first core canvas layer 2, a plurality of (for example, two) conductive fibers are twisted together to prepare a conductive warp.

  In order to improve the adhesion to the first resin layer 4, the canvas material of the first core canvas layer 2 is preferably subjected to an adhesion treatment in which the adhesive 3 is included. The adhesion process is performed by coating the canvas material with the adhesive 3 obtained by dissolving the same in the organic solvent using the same material as the first resin layer 4 or immersing the canvas material in the adhesive 3.

  As the adhesive 3, a transparent thermoplastic elastomer or a transparent thermoplastic resin is used, and in particular, one obtained by dissolving a polyether polyurethane elastomer in a mixed solvent of methyl ethyl ketone / cyclohexane / tetrahydrofuran is preferable.

  The resin and solvent used for the adhesive 3 have a colorless and transparent appearance so that the mark layer forming the mark described later has visible transparency from the transport surface side (the first core canvas layer side). And does not contain components such as pigments, dyes, solid fillers, etc. that block light.

(First resin layer 4)
The first resin layer 4 is formed of a polyurethane, a polyolefin such as polyethylene / polypropylene, a transparent thermoplastic resin made of polyester, or a transparent thermoplastic elastomer. In particular, a polyether-based polyurethane elastomer which is a polyurethane elastomer excellent in processability and strength and excellent in hydrolysis resistance is preferable.

  The first resin layer 4 above the mark layer 5 (on the side of the transport surface) needs to be transparent so that the mark layer 5 can be seen through from the transport surface side, and has a colorless and transparent appearance. , Pigments, dyes, solid fillers, etc. shall not contain any components that mask light.

(Mark layer 5)
The mark layer 5 is formed of a mark 51 printed directly on the second resin layer 6 with ink as shown in FIG. 2 or a film 52 on which the mark 51 is printed in advance as shown in FIG. Here, the mark 51 has a function of visually transmitting information to the outside, and for example, a positioning mark, a mark for PR, a trademark, a description of the specification, etc., which are composed of figures, lines and characters Be

  Examples of the method of direct printing on the second resin layer 6 include inkjet printing, screen printing, transfer printing, or a method of drawing with a pen or the like. In particular, since the mark 51 can be displayed in various designs and color tones over the entire transport surface, a method of forming the mark layer 5 (mark 51) by printing using an inkjet printer is preferable. Moreover, in the case of inkjet printing, the contact area of the 1st resin layer 4 and the 2nd resin layer 6 which are laminated | stacked on both sides of the mark layer 5 is increased by printing the mark of the mark layer 5 in dot form, and adhesion | attachment You can improve your sex.

  As shown in FIG. 3, when the mark layer 5 is a film 52 on which the mark 51 is printed in advance, the size of the film 52 may be the same as the mark 51 or may be larger than the mark 51. For example, the mark layer 5 in which the mark 51 is printed on the film 52 having the same dimension as the conveyance belt 1 may be laminated on the second resin layer 6.

(Second resin layer 6)
Similar to the first resin layer 4, the second resin layer 6 is formed of a polyurethane, a polyolefin such as polyethylene / polypropylene, a transparent thermoplastic resin made of polyester, or a transparent thermoplastic elastomer.

  Similar to the first resin layer 4, the second resin layer 6 may have transparency. When the second resin layer 6 laminated on the lower surface side (inner peripheral side) of the mark layer 5 is white, color development of the mark 51 is improved, and the first core canvas layer 2 and the first resin from the transport surface side The visibility when looking at the mark 51 through the layer 4 is improved.

  The thicknesses of the first resin layer 4 and the second resin layer 6 are each 0.1 to 0.3 mm, and the first resin layer 4, the mark layer 5, and the second resin layer 6 are integrally laminated. 0.2-0.6 mm is preferable when it becomes.

(Method of Manufacturing Transport Belt of First Embodiment)
The manufacturing method of the conveyance belt 1 which concerns on the said 1st Embodiment is demonstrated.
First, an adhesive 3 is prepared by dissolving a transparent thermoplastic elastomer in an organic solvent, and the adhesive 3 is coated on a canvas material (plain weave cloth), or the canvas material is dipped in the adhesive 3 to perform adhesion treatment. The applied first core canvas layer 2 is prepared.

  In addition, the transparent thermoplastic elastomer is extruded into a sheet having a predetermined size by an extruder to produce the first resin layer 4 and the second resin layer 6.

  Next, as shown in the mark layer forming step of FIG. 4, the mark 51 is printed on the surface of the produced second resin layer 6 on the side of the transport surface by an ink jet printer to form the mark layer 5.

  Next, as shown in the first resin layer forming step of FIG. 4, the first resin layer 4 is laminated on the surface side of the second resin layer 6 on which the mark layer 5 is formed.

  Furthermore, as shown in the first core canvas layer forming step of FIG. 4, the first core canvas layer 2 subjected to the adhesion processing is laminated on the transport surface side of the first resin layer 4 and adhered by pressing. Thus, the conveyor belt 1 is obtained.

  When the mark layer 5 is formed by the film 52 on which the mark 51 is printed in advance, as shown in FIG. 5, in the mark layer forming step, the surface on the transport surface side of the second resin layer 6 is The mark layer 5 produced by printing the mark 51 on the film 52 by a printer is laminated.

  In the mark layer forming step and the first resin layer forming step, the mark 51 is printed on the lower side (inner peripheral side) of the first resin layer 4 to form the mark layer 5. The second resin layer 6 may be laminated on the lower side (inner peripheral side) on which the mark layer 5 is formed.

Second Embodiment
As shown in FIG. 6, the conveyor belt 1 of the second embodiment includes a first core canvas layer 2, a first resin layer 4, and a mark layer 5 in order from the outer peripheral side to the inner peripheral side of the conveyor belt 1. And a second resin layer 6 (protective layer), and a second core canvas layer 7 (protective layer) is formed on the lower side (inner peripheral side) of the second resin layer 6. Ru. The first core canvas layer 2, the first resin layer 4, the mark layer 5, and the second resin layer 6 are the same as in the first embodiment.

  Similarly to the first core canvas layer 2, the second core canvas layer 7 is made of a canvas material impregnated with the adhesive 3 in order to improve the adhesion to the second resin layer 6, and the canvas material A woven fabric (plain weave, twill weave, satin weave, etc.) woven by crossing warp and weft yarns is used. Further, as the material of the warp and weft, synthetic fibers such as polyester, vinylon, polylactic acid and polyurethane are used similarly to the first core canvas layer 2. As for the second core canvas layer 7, unlike the first core canvas layer 2, the material, fineness, density and thickness of the warp and weft of the canvas material should be determined regardless of the transparency. Can.

(Method of Manufacturing Transport Belt of Second Embodiment)
First, an adhesive 3 is prepared by dissolving a transparent thermoplastic elastomer in an organic solvent, and the adhesive 3 is coated on a canvas material (plain weave cloth), or the canvas material is dipped in the adhesive 3 to perform adhesion treatment. The applied first core canvas layer 2 and the second core canvas layer 7 are produced.

  In addition, the transparent thermoplastic elastomer is extruded into a sheet having a predetermined size by an extruder to produce the first resin layer 4 and the second resin layer 6.

  Next, as shown in the mark layer forming step of FIG. 7, the mark 51 is printed on the surface of the produced second resin layer 6 on the transport surface side by an ink jet printer to form the mark layer 5.

  Next, as shown in the first resin layer forming step of FIG. 7, the first resin layer 4 is laminated on the surface side of the second resin layer 6 on which the mark layer 5 is formed.

  Furthermore, as shown in the first core canvas layer forming step of FIG. 7, the first core canvas layer 2 subjected to adhesion processing is laminated on the transfer surface side of the first resin layer 4, and the second core of FIG. As shown in the body canvas layer forming step, the second core canvas layer 7 subjected to the adhesion treatment is laminated under the second resin layer 6 and adhered by press pressure to obtain the conveyor belt 1.

Third Embodiment
As shown in FIG. 8, the conveyor belt 1 of the third embodiment includes, in order from the outer peripheral side to the inner peripheral side of the conveyor belt 1, a first core canvas layer 2, a first resin layer 4 and a mark layer 5. The second core canvas layer 7 (protective layer) is further stacked on the lower side (inner peripheral side) of the mark layer 5. The first core canvas layer 2, the first resin layer 4 and the mark layer 5 are the same as in the first embodiment, and the second core canvas layer 7 is the same as in the second embodiment. is there.

(Method of Manufacturing Transport Belt of Third Embodiment)
First, an adhesive 3 is prepared by dissolving a transparent thermoplastic elastomer in an organic solvent, and the adhesive 3 is coated on a canvas material (plain weave cloth), or the canvas material is dipped in the adhesive 3 to perform adhesion treatment. The applied first core canvas layer 2 and the second core canvas layer 7 are produced.

  Further, the first thermoplastic resin layer 4 is produced by extruding the transparent thermoplastic elastomer into a sheet of a predetermined size by means of an extruder.

  Next, as shown in the mark layer forming step of FIG. 9, the mark 51 is printed on the lower side (inner peripheral side) of the produced first resin layer 4 by an inkjet printer to form the mark layer 5.

  Next, as shown in the first core canvas layer forming step of FIG. 9, the first core canvas layer 2 subjected to adhesion processing is laminated on the transfer surface side of the first resin layer 4, and the second core canvas layer 2 of FIG. As shown in the core canvas layer forming step, the second core canvas layer 7 subjected to adhesion processing is laminated on the surface side of the first resin layer 4 on which the mark layer 5 is formed, and is adhered by pressing and conveyed Get the belt 1.

(First evaluation test)
Next, conveyance belts according to Examples 1 to 3 and Comparative Examples 1 and 2 are manufactured according to the configuration described in Table 1 below, and for each conveyance belt, (1) mark layer peeling test (wipe test), (2) Measurement of belt strength before running test, (3) Measurement of belt strength after running test, (4) Verification test of mark layer peeling after running test. Example 1 corresponds to the conveyor belt 1 according to the first embodiment described above, Example 2 corresponds to the conveyor belt 1 according to the second embodiment described above, and Example 3 relates to the first embodiment described above. It corresponds to the conveyance belt 1 according to the third embodiment. Moreover, the comparative example 1 is a conveyance belt comprised by one core canvas layer (1 ply), and the mark is printed on the conveyance surface of a core canvas layer. The comparative example 2 is a conveyance belt of the structure which pinched | interposed the resin layer by two-layer core canvas layer, and prints the mark on the core canvas layer by the side of a conveyance surface.

  (1) In the mark layer peeling test (wipe test), the conveyance surface of the conveyance belt was wiped with alcohol, and the presence or absence of mark peeling (ink peeling) of the mark layer was evaluated. As a judgment standard, if there is no peeling, it will be evaluated as "○", and if there is peeling, it will be evaluated as "x".

  (2) In the measurement of the belt strength before the running test, a test piece is collected for each of the transport belts before the running test (described later) according to JIS K 6376, and the tensile speed of 100 mm / min by Amsler testing machine And the belt strength was measured. As a judgment standard, if it is 10 N / mm or more which is required for food conveyance application, it is evaluated as no problem, and if less than 10 N / mm, it is evaluated as problematic.

  (3) In the measurement of the belt strength after the running test, first, the running test is performed for each of the transport belts. As a running test, each running belt was run using a running tester shown in FIG. 10, and the belt strength of each running belt after running was measured. Specifically, as shown in FIG. 10, the drive pulleys (φ 100) are used as the transport belts (belt size: width 100 mm × length 1450 mm) according to Examples 1 to 3 and Comparative Examples 1 to 2. Wrap around four pulleys: bend pulley (φ 100), take-up pulley (φ 25), and tail pulley (φ 25), and use a scraper (50 mm wide × 140 mm long × 5 mm thick) with a cylindrical shape of φ 6 mm (R 3 mm) at the tip. While pressing a pressing indenter) on the transport surface of each transport belt with a load of 2.6 kgf, the belt travels at a speed of 30 m / min, a belt tension of 2.6 kgf / cm, and a bending frequency of 600,000 cycles.

  And about each of each conveyance belt after a run test, the test piece was extract | collected by the method according to JISK 6376, tension was measured at the tension speed of 100 mm / min by Amsler testing machine, and belt strength was measured. As a judgment standard, if it is 10 N / mm or more which is required for food conveyance application, it is judged that there is no problem, and if less than 10 N / mm, it is judged that there is a problem.

  (4) In the confirmation test of mark layer peeling after running test, the conveyance surface of each conveyance belt after running test was observed, and the presence or absence of peeling of the mark layer (mark) was visually observed. As a judgment standard, if there is no peeling, it will be evaluated as "○", and if there is peeling, it will be evaluated as "x".

(Evaluation result of mark layer peeling test)
In Examples 1 to 3, since the mark layer 5 is disposed between the first resin layer 4 and the second resin layer 6 (the mark is inside the transport belt), the mark layer does not peel off before the traveling test. . In Comparative Examples 1 and 2, the mark layer was peeled off by wiping with alcohol.

(Measurement result of belt strength before running test)
The belt strength (46 N / mm) of the conveyor belt of Example 1 in which the core canvas layer is one layer (one ply) is the conveyor belt of Comparative Example 1 in which the same core canvas layer (one ply) is used. It showed almost the same strength as compared to the belt strength (44 N / mm). Also, the belt strengths (76 N / mm and 71 N / mm, respectively) of the conveyor belts of Example 2 and Example 3 in which the core canvas layer is 2 layers (2 plies) are the same 2 layers of core canvas layers ( As compared with the belt strength (90 N / mm) of the conveyor belt of Comparative Example 2 configured by 2 ply), the belt strength was smaller. However, since the belt strength required for ordinary food conveyance applications is 10 N / mm or more, it can be used without any problem.

(Measurement result of belt strength after running test)
The belt strength (43 N / mm) of the conveyor belt of Example 1 showed substantially the same strength as that of the conveyor belt of Comparative Example 1 (42 N / mm). Further, the belt strengths (72 N / mm and 68 N / mm, respectively) of the conveyor belts of Example 2 and Example 3 are comparable to the belt strengths of the conveyor belt of Comparative Example 2 (86 N / mm). It became smaller. Although the belt strength after the running test in Examples 1 to 3 and Comparative Examples 1 and 2 is slightly lower than that before the running test, it is 10 N / mm or more, which is the belt strength required for ordinary food conveyance applications. It can be used without problems.

(Evaluation results of mark layer peeling confirmation test after running test)
In Examples 1 to 3, since the mark layer 5 is disposed between the first resin layer 4 and the second resin layer 6 (the mark is inside the transport belt), the mark layer peels off even after the running test. do not do. In Comparative Examples 1 and 2, the mark layer peeled off after the running test.

  In the conveyor belts 1 of the first to third embodiments, the mark layer 5 (mark 51) is disposed below the first resin layer 4 so that the mark layer 5 does not peel off. At this time, in order to ensure the visibility of the mark layer 5, a material (type of fibers, fineness, density, thickness, etc.) having transparency in the first core canvas layer 2 and the first resin layer 4 is used. However, according to the above test results, the conveyor belts 1 according to the first to third embodiments have a belt strength of 10 N which is required for ordinary food conveyance applications even before and after the traveling test. It can be said that, since it has mm or more, it has sufficient performance as a conveyance belt.

(Second evaluation test)
Next, the superiority or inferiority of the thickness of the core canvas layer, which serves as an index for selecting the size and color of the mark, is verified by "functional test of mark visibility" and "measurement of belt strength before and after running test". did.

(Sensory test of mark visibility)
In the sensory test of the visibility of marks, the conveyance belts of Examples 4 to 7 having the same configuration as that of Example 1 except for the configuration of the core canvas layer according to the configuration described in Table 2 were produced. On each of the transport belts, a mark layer in which a mark (letter “A”) was printed by an inkjet printer was formed on the surface on the transport surface side of the second resin layer (white). As shown in FIG. 11, the size of the mark (letter “A”) was 50 mm, 40 mm, 30 mm, 30 mm, 20 mm, and 10 mm (mark size), respectively. In addition, as shown in FIG. 11, the color of the mark (the letter “A”) is set to four types of red, blue, black and yellow for each size. Then, each manufactured transport belt was cut into a predetermined size (210 × 297 mm) to obtain a test piece. That is, a total of 20 types of test pieces were created.

  In the sensory test of mark visibility, as shown in FIG. 12, 20 kinds of marked test pieces are placed on a 600 mm high table, and 6 observers (A to F) are about 1 m away from the table The mark was visually observed at the position where the mark (character) could be read (identified) "○", and when the mark (character) could not be read (not identified), "x" It was judged and it was judged and recorded for each observer whether or not the mark (character) of each example was read. The result of the sensory test of mark visibility is shown in FIG. Next, with respect to the result of the sensory test of the visibility of the marks in FIG. 13, the mark size of each example and the result of counting the number of “o” for each color and the correct answer rate are summarized in Table 4 . Note that, as an example of the calculation of the number of “o” and the calculation of the correct answer rate, Table 3 shows the result of aggregation of the propriety of identification according to observers whose mark (character) is red in the first embodiment.

[Table 3]
(Possor (character) in Example 1 is red for each observer's identification possibility or not)

  According to the result of the sensory test of the visibility of the marks, it can be seen that the thinner the core canvas layer, the smaller mark size can be identified. That is, the smaller the core canvas layer is, the smaller the mark can be used, but it is understood that the thicker the core canvas layer, the larger the mark. However, in Example 6 having a core canvas layer with a thickness of 0.9 mm, no core can be identified by six observers even if the mark size is 50 mm for the yellow mark. The thickness of the body canvas layer is preferably 0.8 mm or less (in Examples 1, 4, and 5, at least one observer has identified it).

  Further, in the conveyor belts of the respective embodiments, since the second resin layer is white, the conveyor surface is white. It can be understood that, with respect to the white conveyance surface, dark colors such as red, blue and black are easy to distinguish and yellow is hard to distinguish.

(Measurement of belt strength before and after running test)
Next, it was verified how much the belt strength decreased as the core canvas layer was made thinner. Example 8 (thickness 0.2 mm of core canvas layer) and Example 9 (thickness 0.1 mm of core canvas layer) of the same configuration as Example 1 except that the thickness of the core canvas layer is different. The conveyor belts were manufactured, and the measurement of the belt strength before and after the running test and the mark layer peeling test were performed. The measurement of the belt strength before and after the running test and the results of the mark layer peeling test are shown in Table 5.

  According to the measurement results of the belt strength before and after the running test, the belt strength of the conveyor belt of Example 8 in which the thickness of the core canvas layer is 0.2 mm is 19.5 N / mm before the running test and after the running test The belt strength is lower than that of Example 1 which is 15.5 N / mm and the thickness of the core canvas layer is 0.5 mm. However, since the belt strength of the conveyor belt of Example 8 in which the thickness of the core canvas layer is 0.2 mm is 10 N / mm or more which is the belt strength required for food conveyance applications, it can be used without any problem. On the other hand, the belt strength of the conveyor belt of Example 9 in which the thickness of the core canvas layer is 0.1 mm is 9.3 N / mm before the running test and 7.2 N / mm after the running test. The required belt strength was less than 10 N / mm. Therefore, it was found that the thickness of the core canvas layer is desirably 0.2 mm or more from the viewpoint of the belt strength.

  In addition, peeling of the mark layer of Example 8 and Example 9 did not occur similarly to Example 1, and there was no problem.

  From the second evaluation test, the thickness of the first core canvas layer may be in the range of 0.2 mm to 0.8 mm from the viewpoint of the belt strength and the visibility of marks (characters) in the conveyance belt. It turned out to be preferable.

(effect)
According to the above configuration, by arranging the mark layer 5 between the first resin layer 4 and the protective layer, it is possible to prevent the mark layer 5 from being in direct contact with the transported object and the like. As a result, it is possible to prevent the mark layer 5 from being peeled off and adhering to or mixing with the conveyed product.
In addition, since the first core canvas layer 2 and the first resin layer 4 have transparency, the mark 51 of the mark layer 5 stacked on the upper side of the protective layer can be exposed from the outside to the first core canvas layer 2 and the first core canvas layer 2. It can be visually observed through the first resin layer 4.
Moreover, by using the canvas material for the first core canvas layer 2 in direct contact with the conveyed product, it is possible to maintain good peelability for the conveyed product.

  Further, according to the configuration of the first and second embodiments, by arranging the mark layer 5 between the first resin layer 4 and the second resin layer 6, the mark layer 5 can be made stronger and processable. It can be sandwiched and held by an excellent resin. Thereby, the mark layer 5 can be stably fixed between the first resin layer 4 and the second resin layer 6.

  Further, according to the configuration of the second and third embodiments, the upper side (the surface on the side in contact with the object to be conveyed) and the lower side of the conveyance belt 1 can be covered with the canvas material. Thereby, the strength and durability of the transport belt 1 can be improved.

  Further, according to the above configuration, by making the canvas material constituting the first core canvas layer 2 into a fiber with a fineness of 280 to 1200 dtex, good belt tension for conveyance is maintained while securing the visibility of the mark 51. be able to.

  In addition, by setting the thickness of the first core canvas layer 2 to 0.2 to 0.8 mm by the above configuration, the visibility of the mark 51 is secured, and good strength and durability of the transport belt 1 can be obtained. It can be held.

  Further, according to the above configuration, by making the first resin layer 4 a transparent thermoplastic elastomer or a transparent thermoplastic resin, the visibility of the mark 51 disposed under the first resin layer 4 is secured. In addition, the first resin layer 4 can be configured to be excellent in processability and strength.

  Moreover, according to the said structure, since the canvas raw material of the 1st core canvas layer 2 contains a white electroconductive fiber, the conveyance belt 1 can be made hard to be charged, without impairing the visibility with respect to the mark layer 5. FIG.

  Further, according to the above configuration, since the first core canvas layer 2 contains the canvas material impregnated with the transparent thermoplastic elastomer or the adhesive 3 made of the transparent thermoplastic resin, the first core fabric The adhesiveness between the first core canvas layer 2 and the first resin layer 4 can be improved while securing the visibility of the mark 51 via the canvas layer 2.

  Further, according to the configuration of the first and second embodiments, since the white second resin layer 6 is disposed below the mark layer 5, the visibility of the mark 51 can be improved.

Further, according to the manufacturing method of the first embodiment, the mark layer 5 can be disposed between the first resin layer 4 and the second resin layer 6 so that the mark layer 5 does not come in direct contact with the transported object or the like. Can be As a result, it is possible to manufacture the transport belt 1 capable of preventing the mark layer 5 from being peeled off and adhering to the transported product.
In addition, since the first core canvas layer 2 and the first resin layer 4 have transparency, the mark 51 of the mark layer 5 stacked on the upper side of the second resin layer 6 can be externally processed from the first core canvas. The conveyance belt 1 which can be visually observed through the layer 2 and the first resin layer 4 can be manufactured.
In addition, by using a canvas material for the first core canvas layer 2 in direct contact with the conveyed product, it is possible to manufacture the conveyance belt 1 which retains good peelability with respect to the conveyed product.

  Further, according to the manufacturing method of the second embodiment, the upper side (the surface on the side in contact with the article to be conveyed) and the lower side of the conveyor belt 1 are covered with a canvas material to improve the strength and durability of the conveyor belt 1 The belt 1 can be manufactured.

Further, according to the manufacturing method of the third embodiment, the upper side (the surface on the side in contact with the article to be conveyed) and the lower side of the conveyor belt 1 are covered with the canvas material to improve the strength and durability of the conveyor belt 1 The belt 1 can be manufactured.
Moreover, the thin conveyance belt 1 can be manufactured by using only one resin layer.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment and an Example. Further, the scope of the present invention is indicated not only by the description of the embodiments and the examples described above but also by the claims, and further includes all modifications within the meaning and scope equivalent to the claims.

DESCRIPTION OF SYMBOLS 1 Transport belt 2 1st core canvas layer 3 Adhesive agent 4 1st resin layer 5 mark layer 6 2nd resin layer 7 2nd core canvas layer 51 mark 52 film

Claims (13)

A first core canvas layer having transparency and comprising a canvas material,
A first resin layer laminated on the lower side of the first core canvas layer and having transparency and containing a resin;
A mark layer laminated under the first resin layer and including a mark for transmitting information to the outside;
A protective layer laminated under the mark layer,
The conveyance belt characterized by being stacked.   The transport belt according to claim 1, wherein the protective layer is a second resin layer containing a resin.   The conveyor belt according to claim 1, wherein the protective layer is a second core canvas layer containing a canvas material. The protective layer is
A second resin layer laminated on the lower side of the mark layer and containing a resin;
A second core canvas layer laminated under the second resin layer and containing a canvas material;
The conveyor belt according to claim 1, comprising:   The conveyor belt according to any one of claims 1 to 4, wherein the canvas material of the first core canvas layer is a fiber having a fineness of 280 to 1200 dtex.   The conveyance belt according to any one of claims 1 to 5, wherein a thickness of the first core canvas layer is 0.2 to 0.8 mm.   The conveyance belt according to any one of claims 1 to 6, wherein the first resin layer is a transparent thermoplastic elastomer or a transparent thermoplastic resin.   The conveyor belt according to any one of claims 1 to 7, wherein the canvas material of the first core canvas layer contains white conductive fibers.   9. The first core canvas layer according to any one of claims 1 to 8, wherein the canvas material is impregnated with an adhesive made of a transparent thermoplastic elastomer or a transparent thermoplastic resin. Conveyor belt.   The transport belt according to claim 2, wherein the second resin layer is white. A mark layer forming step of forming a mark layer by directly printing a mark for transmitting information to the outside on the upper side of the second resin layer, or laminating a film on which the mark is printed;
A first resin layer forming step of laminating a transparent first resin layer on the upper side of the mark layer;
A first core canvas layer forming step of laminating a first core canvas layer having transparency and containing a canvas material on the upper side of the first resin layer;
A method of manufacturing a conveyor belt comprising:   The method according to claim 11, further comprising a second core canvas layer forming step of laminating a second core canvas layer containing a canvas material on the lower side of the second resin layer. . A mark layer forming step of forming a mark layer by directly printing a mark for transmitting information to the outside under the first resin layer, or laminating a film on which the mark is printed;
A first core canvas layer forming step of laminating a first core canvas layer having transparency and containing a canvas material on the upper side of the first resin layer;
A second core canvas layer forming step of laminating a second core canvas layer having transparency and containing a canvas material under the mark layer;
A method of manufacturing a conveyor belt comprising: