JP2016183049A - Conveying belt and manufacturing method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveying belt that is excellent in performance in conveying conveyed objects with high adhesion (for example foods such as bread dough) and durability at the time of conveying the conveyed objects and suppresses peeling between layers thereof.SOLUTION: The conveying belt is prepared by forming a non-adhesive layer 1 including silicone-modified resin containing organosiloxane unit at a conveyance surface side and/or an inner peripheral surface side of a core body 2. The silicone-modified resin may be thermoplastic resin or thermoplastic elastomer. Ratios of the organosiloxane unit are about 5-20 mass% relative to the whole of the silicone-modified resin. The silicone-modified resin may be silicone-modified polyurethane. The core body contains a cloth and a resin component, and the resin component may be polyurethane.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transport belt for transporting various transport objects such as food and a method for manufacturing the same.

  Conventionally, a conveyor belt (conveyor belt) including canvas has been used for conveying various foods represented by bread dough and confectionery dough. The conveyance belt including the canvas is sealed by impregnating or adhering an adhesive (liquid composition) containing a thermoplastic resin or a thermoplastic elastomer as a main component in order to prevent the yarn fraying or weaving of the canvas. However, in this conveyor belt, a part of the transported object such as food may be rubbed into the canvas and a trouble may occur in the contraction of the belt. Therefore, a belt is also used in which a cover layer (protective layer) is further laminated on the canvas as a core body and the surface of the cover layer is the transport surface.

In JP-A-10-297730 (Patent Document 1), in a cut-edge type resin conveyor belt in which a resin cover layer is laminated on the surface of at least one canvas core body, the canvas core body is bonded. A resin conveyor belt that is dipped at a predetermined concentration at least 3 to 6 times and has a basis weight of 20 to 50 g / m ² is disclosed. In this document, the resin cover layer is formed of thermoplastic polyurethane, polyvinyl chloride, polyolefin-based thermoplastic elastomer, or the like.

  However, in the transport belt in which the resin cover layer is laminated, the transport surface has high adhesiveness, and when a highly sticky food such as bread dough is transported, the transported object sticks to the transport surface and is difficult to separate. In general, in order to improve non-adhesiveness, a method of applying a release agent such as a silicone release agent is known. However, because the release agent adheres and the conveyed product is contaminated. In particular, its use is limited in the food field. Moreover, when the fallen foreign material spilled from the transported material traveled to the inner peripheral surface (contact surface with the pulley) side of the belt and the foreign material adhered to the inner peripheral surface of the belt, the durability of the transport belt was lowered. That is, if the conveyance belt continues to run with foreign matter adhering to the inner peripheral surface of the belt, the foreign matter is sandwiched between the belt and the pulley, and local stress is applied to easily break the belt.

  JP-A-11-29212 (Patent Document 2) is composed of a resin layer, a core layer, and an adhesive layer disposed between the two layers, and the resin layer includes polyurethane, polyvinyl chloride, polyolefin, and It is formed by kneading and molding an antibacterial agent mainly composed of bis (2-pyridylthio-1-oxide) zinc into one resin selected from the group consisting of silicone. An antibacterial / antifungal belt for food conveyance that is 0.1 to 5 parts by weight of the antibacterial agent is disclosed. This document describes that a belt suitable for conveying an adhesive food can be produced by forming the resin layer of the belt with silicone.

  However, in this conveyor belt, the non-adhesiveness of the conveyor surface is increased, but if the resin layer is silicone, the adhesion to the core layer is lowered and the resin layer is easily peeled off. Furthermore, even this conveyor belt had low durability.

JP-A-10-297730 (Claim 1, paragraph [0010]) JP-A-11-29212 (Claim 1, paragraph [0026])

  Accordingly, an object of the present invention is to provide a transport belt that is excellent in transportability of a highly sticky transported object (food such as bread dough), has excellent durability when transporting the transported object, and suppresses peeling between layers. It is in providing the manufacturing method.

  Another object of the present invention is to provide a transport belt that can transport a transported object without contaminating it, and a method for manufacturing the transport belt.

  In order to achieve the above-mentioned problems, the present inventors have studied mixing and laminating a silicone resin and a binder resin as a cover layer on the conveying surface or inner peripheral surface (contact surface with the pulley). It was difficult to uniformly mix the two, and it was difficult to achieve both non-adhesiveness and adhesion of the cover layer to the core. Therefore, as a result of further intensive studies, by forming a non-adhesive layer containing a silicone-modified resin containing an organosiloxane unit on the transport surface and / or inner peripheral surface side of the core as a non-adhesive film or a cover layer, The present inventors have found that it is possible to improve the transportability (and the durability of the belt) of a high transported object and to suppress delamination between layers.

  That is, the transport belt of the present invention includes a core and a non-adhesive layer formed on the transport surface and / or inner peripheral surface of the core and including a silicone-modified resin containing an organosiloxane unit. The silicone-modified resin may be a thermoplastic resin or a thermoplastic elastomer. The ratio of the organosiloxane unit is about 5 to 20% by mass with respect to the entire silicone-modified resin. The silicone-modified resin may be a silicone-modified polyurethane (particularly a polyether-type polyurethane or polycarbonate-type polyurethane silicone-modified resin). The core body may include a fabric and a resin component, and the resin component may be the same type of resin as the silicone-modified resin (for example, polyurethane).

  The non-adhesive layer may be a non-adhesive film having an average thickness of about 10 to 100 μm. This non-adhesive film may contain a curing agent.

  The non-adhesive layer may be a non-adhesive cover layer having an average thickness of about 0.1 to 2 mm. In the conveyance belt having the non-adhesive cover layer, a plurality of convex portions may be formed in the vertical and horizontal directions on the surface of the non-adhesive cover layer.

  In the transport belt of the present invention, the core body further includes a second core body in addition to the first core body, and an intermediate layer is interposed between the first core body and the second core body. Also good.

  In the transport belt of the present invention, a non-adhesive layer may be formed on the transport surface side of the core body, and a cover layer containing a resin component may be formed on the inner peripheral surface side of the core body.

  The present invention also includes a method for manufacturing the transport belt including a non-adhesive layer forming step of forming a non-adhesive layer on the transport surface and / or inner peripheral surface side of the core. In the non-adhesive layer forming step, a liquid composition containing a silicone-modified resin may be applied to the transport surface and / or inner peripheral surface of the core to form a non-adhesive film. Further, in the non-adhesive layer forming step, the non-adhesive cover layer may be formed by laminating the sheet-like precursor on the transport surface and / or the inner peripheral surface of the core.

  In the present invention, a non-adhesive layer containing a silicone-modified resin containing an organosiloxane unit is formed on the transport surface and / or inner peripheral surface side of the core, so a highly adhesive transported product (food such as bread dough) Transportability and durability when transporting the transported object can be improved, and peeling between layers constituting the belt can also be suppressed. In particular, the adhesion between the layers can be further improved by using the same type of resin for the silicone-modified resin and the resin component contained in the core. Furthermore, when a non-adhesive layer is formed on the conveyance surface side of the core, non-adhesiveness can be improved without including an additive such as a release agent, so that the conveyed product can be conveyed without being contaminated. In particular, non-adhesiveness is expressed by the silicone unit, so even if it is transferred to a transported product, it is highly safe and suitable for transporting foods and the like.

FIG. 1 is a schematic view showing an example of a transport belt provided with the non-adhesive film of the present invention on the transport surface side. FIG. 2 is a schematic view showing an example of a transport belt provided with the non-adhesive cover layer of the present invention on the transport surface side. FIG. 3 is a side view of the transport belt of the present invention prepared endlessly and attached to a pulley. FIG. 4 is a plan view of the joining portion of the conveyor belt of the present invention prepared in an endless manner. FIG. 5 is a side view of the joint portion of the conveyor belt of the present invention prepared in an endless manner. FIG. 6 is a schematic diagram showing a schematic layout of a 5-axis running test machine used in the running test of the example.

[Conveyor belt]
The transport belt of the present invention includes a core and a non-adhesive layer formed on the transport surface and / or inner peripheral surface of the core and including a silicone-modified resin containing an organosiloxane unit. Furthermore, the non-adhesive layer can be roughly classified into a non-adhesive film having an average thickness of about 10 to 100 μm and a non-adhesive cover layer having an average thickness of about 0.1 to 2 mm.

  FIG. 1 is a schematic view showing an example of a transport belt provided with the non-adhesive film of the present invention on the transport surface side, and a core body 2 and a non-adhesive film 1 laminated on the transport surface side of the core body 2. It is formed with. The conveyor belt having such a non-adhesive film has a surface shape that follows the uneven shape of the fabric because the non-adhesive film is thin. The transportability of the transported object can be improved.

  On the other hand, FIG. 2 is a schematic view showing an example of a transport belt provided with the non-adhesive cover layer of the present invention on the transport surface side. The core body 4 and the non-adhesive layer laminated on the transport surface side of the core body 4 are shown. The cover layer 3 is formed. Since the transport belt having the non-adhesive cover (protective) layer has a relatively thick non-adhesive cover layer, it is possible to prevent a part of the transported object such as food from being rubbed into the core fabric. It is advantageous.

  The transport belt of the present invention is not limited to the embodiment shown in FIGS. 1 and 2, and a non-adhesive film or a non-adhesive cover layer is laminated on the inner peripheral surface side (the side opposite to the side on which the transport surface is laminated) of the core body. It may be a conveyor belt. In the conveyance belt in which the non-adhesive film or the non-adhesive cover layer is laminated on the inner peripheral surface, the durability of the belt can be improved. Furthermore, the conveyance belt of the present invention may be a conveyance belt in which a non-adhesive film or a non-adhesive cover layer is laminated on both sides of the core as a belt having the above-described characteristics.

(Non-adhesive layer)
The silicone-modified resin contained in the non-adhesive layer has a base resin that is modified with a silicone component, and more specifically, an organosiloxane unit (silicone unit) is incorporated in the base resin molecule as a copolymer. The resin (base resin unit) can improve the adhesion to the core body and can suppress the transfer (attachment) of the silicone component to the conveyed product.

The organosiloxane unit is represented by the formula: —Si (—R) ₂ —O— (the group R is a substituent), and examples of the substituent represented by the group R include an alkyl group, an aryl group, and a cycloalkyl group. Etc. Examples of the alkyl group include C _1-12 alkyl groups such as methyl, ethyl, propyl, butyl, hexyl, octyl and decyl. Examples of the aryl group include C _6-20 aryl groups such as phenyl, methylphenyl (tolyl), dimethylphenyl (xylyl), and naphthyl. Examples of the cycloalkyl group include C _5-14 cycloalkyl groups such as cyclopentyl, cyclohexyl, and methylcyclohexyl. These substituents can be used alone or in combination of two or more. Among these substituents, C _1-3 alkyl groups such as a methyl group and C _6-12 aryl groups such as a phenyl group are widely used.

  The form of introduction of the organosiloxane unit is not particularly limited as long as it is bonded (copolymerized) in the base resin, and may be introduced into the main chain or may be introduced into the side chain. The introduction method can be selected according to the type of the base resin, and is based on a (poly) organosiloxane monomer having an ethylenically unsaturated bond (such as a vinyl group) or a reactive group (such as a hydroxyl group, an amino group, or a carboxyl group). You may introduce | transduce by making it react (polymerize) with resin and its monomer. The form of copolymerization is not particularly limited, and any form of random copolymerization, block copolymerization, and graft copolymerization may be used.

  The ratio of the organosiloxane unit can be selected from the range of about 1 to 50% by mass relative to the entire silicone-modified resin, for example, 2 to 30% by mass, preferably 3 to 25% by mass, and more preferably 5 to 20% by mass ( In particular, it is about 6 to 18% by mass. If the ratio of the organosiloxane unit is too small, the non-adhesiveness with respect to the conveyed product may be lowered, and conversely if too large, the adhesion to the core may be lowered.

  The silicone-modified resin may be a thermoplastic resin or a thermoplastic elastomer. In the case of a thermoplastic resin, examples of the base resin include polyolefin, (meth) acrylic resin, polyester, polyacetal, polycarbonate, polyurethane, and polyimide. In the case of a thermoplastic elastomer, examples of the base resin include a polyolefin elastomer, a polyester elastomer, a polyamide elastomer, and a polyurethane elastomer. These base resins can be used alone or in combination of two or more.

  Of these base resins, from the viewpoints of handleability and flexibility, thermoplastic resins or thermoplastic elastomers are preferable, and polyurethanes or polyurethane elastomers are particularly preferable.

  The polyurethane (or polyurethane elastomer) may be a polyurethane obtained by reacting polyols and polyisocyanates.

Examples of the polyols include polyester polyols, polyether polyols, polyether ester polyols, polycarbonate polyols, polyester amide polyols, and acrylic polymer polyols. These polyols can be used individually or in combination of 2 or more types. Among these polyols, polyether polyols (poly C _2-4 alkylene glycols such as polyethylene glycol and polytetramethylene glycol ether), polycarbonate polyols (ethylene glycol and 1, 1) are excellent in water resistance and chemical resistance. Preferred is a reaction product of a diol such as 4-butanediol and a di-C _1-4 alkyl carbonate such as dimethyl carbonate or a di-C _6-12 aryl carbonate such as diphenyl carbonate.

  The polyisocyanates include, for example, aliphatic polyisocyanates [propylene diisocyanate, trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate (HDI), trimethylhexamethylene diisocyanate (TMDI), lysine diisocyanate (LDI), etc. 1,6,11-undecane triisocyanate methyloctane, aliphatic triisocyanates such as 1,3,6-hexamethylene triisocyanate], alicyclic polyisocyanates [cyclohexane 1,4-diisocyanate, isophorone diisocyanate (IPDI), Alicyclic diisocyanates such as hydrogenated xylylene diisocyanate and hydrogenated bis (isocyanatophenyl) methane, and bicyclohept Cycloaliphatic triisocyanates, etc.], aromatic polyisocyanates [phenylene diisocyanate, tolylene diisocyanate (TDI), xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate (TMXDI), naphthalene diisocyanate (NDI), bis (Isocyanatophenyl) methane (MDI), toluidine diisocyanate (TODI), aromatic diisocyanates such as 1,3-bis (isocyanatophenyl) propane, and the like.

  These polyisocyanates include derivatives such as multimers (dimers, trimers, tetramers, etc.), adducts, modified products (biuret modified products, allophanate modified products, urea modified products, etc.) It may be a urethane oligomer having an isocyanate group.

  These polyisocyanates can be used alone or in combination of two or more. Among these polyisocyanates, aliphatic diisocyanates such as HDI, alicyclic diisocyanates such as IPDI, araliphatic diisocyanates such as XDI, and aromatic diisocyanates such as MDI and TDI are widely used because of their high versatility. Aromatic diisocyanates are particularly preferred.

  Of these polyurethanes, polyether type polyurethanes and polycarbonate type polyurethanes are preferred from the viewpoint of excellent water resistance and chemical resistance.

  When the silicone-modified resin is a silicone-modified polyurethane, the non-adhesive layer may further contain a curing agent. The curing agent is effective when the non-adhesive layer is formed by applying a liquid composition and is a thin layer of 10 to 100 μm.

  As the curing agent, polyisocyanates, polyols, polyamines and the like, which are conventional curing agents, can be used and can be selected according to the type of polyurethane, but polyisocyanates are preferable from the viewpoint of reactivity. The polyisocyanate can be used as the polyisocyanate. Of the polyisocyanates, aromatic diisocyanates are preferred as the curing agent from the viewpoint of stable reactivity.

  The ratio of a hardening | curing agent is 1-50 mass parts with respect to 100 mass parts of silicone modified polyurethane, Preferably it is 2-25 mass parts, More preferably, it is about 5-10 mass parts.

  Non-adhesive layers are conventional additives such as chain extenders, stabilizers (weather resistant stabilizers, antioxidants, heat stabilizers, light stabilizers, etc.), fillers, plasticizers, lubricants, colorants, solvents, etc. May be included. These additives can be used alone or in combination of two or more. The ratio of the additive is 30 parts by mass or less, preferably 0.1 to 20 parts by mass, more preferably about 1 to 15 parts by mass with respect to 100 parts by mass of the silicone-modified resin (particularly silicone-modified polyurethane).

  The average thickness of the non-adhesive layer can be selected from the range of about 10 μm to 1 mm according to the type of belt and the type of manufacturing method.

  Specifically, the non-adhesive film formed by application of the liquid composition may be thin, and the average thickness is, for example, about 10 to 100 μm, preferably 15 to 50 μm, and more preferably about 20 to 30 μm. . If the thickness of the non-adhesive film is too thin, the non-adhesiveness may decrease, and if it is too thick, the non-adhesive property may decrease.

  The non-adhesive cover layer formed by laminating sheet-like precursors may be relatively thick, and the average thickness is, for example, 0.05 to 3 mm, preferably 0.1 to 2 mm, more preferably It is about 0.15 to 1.5 mm (particularly 0.2 to 1 mm). If the thickness of the non-adhesive cover layer is too thin, the non-adhesiveness may be reduced, and if it is too thick, the mechanical properties of the belt may be reduced.

  In the present specification and claims, the average thickness of the non-adhesive layer can be measured by observing the cross section of the conveyor belt using a scanning electron microscope and calculating the average value of the thicknesses at three locations.

  Furthermore, the non-adhesive cover layer may be formed with a plurality of convex portions in the vertical and horizontal directions in order to improve non-adhesiveness. The plurality of convex portions may be formed randomly or regularly spaced from each other, and are preferably formed regularly from the viewpoint of high uniformity. The planar shape of the convex portion is not particularly limited, and may be, for example, a polygon, a circle, or an ellipse. The average diameter of the planar shape of the convex portion is, for example, about 0.1 to 10 mm, preferably about 0.2 to 5 mm, and more preferably about 0.3 to 1 mm. The average interval between adjacent convex portions (interval between the central portions) is, for example, about 0.2 to 15 mm, preferably about 0.3 to 10 mm, and more preferably about 0.5 to 5 mm. The average height of the convex portions is, for example, about 0.01 to 0.5 mm, preferably about 0.03 to 0.3 mm, and more preferably about 0.05 to 0.2 mm.

(Core)
The core includes a fabric and a resin component, and the resin component is usually impregnated between the fibers in the fabric. As the fabric (or canvas), a fabric conventionally used for the core of the conveyance belt can be used, and examples thereof include woven fabric and knitted fabric. Of these fabrics, a woven fabric is preferable because it is excellent in strength, productivity, and the like.

  The weaving configuration (woven structure) of the woven fabric may be a structure such as plain weave, twill weave (oblique texture), satin weave (lion weave, satin) or the like. Among these woven structures, a plain weave may be used from the viewpoint of excellent balance such as strength, and a twill weave and satin weave may be used from the viewpoint of adhesion to the non-adhesive layer.

  In the woven fabric, the density of the warp is, for example, about 10 to 150 pieces / 5 cm, preferably about 30 to 120 pieces / 5 cm, and more preferably about 60 to 100 pieces / 5 cm. The density of the weft is, for example, about 10 to 120 pieces / 5 cm, preferably about 30 to 100 pieces / 5 cm, and more preferably about 50 to 90 pieces / 5 cm.

  The fibers constituting the fabric may be short fibers, but from the viewpoint of strength, a spun yarn (spun yarn) in which long fibers and short fibers are brought together is preferable. Further, the long fibers may be monofilament yarns or multifilament yarns.

As the fibers, fibers of various materials can be used. For example, polyester fibers (polyalkylene arylate fibers such as polyethylene terephthalate and polyethylene naphthalate), polyamide fibers (aliphatic polyamide fibers such as polyamide 6 and polyamide 66, aramid fibers, etc.) Cellulosic fibers such as cotton and rayon may also be used. Of these, poly C _2-4 alkylene arylate fibers such as polyethylene terephthalate (PET) are preferred from the viewpoint of excellent balance between strength and flexibility.

  In the case of monofilament yarn or multifilament yarn, the average fiber diameter (thickness) of the fiber is, for example, about 280 to 1200 dtex, preferably about 300 to 1000 dtex, and more preferably about 500 to 800 dtex. In the case of a spun yarn, the thickness (count) of the fiber is, for example, 5 to 100, preferably 7 to 50, and more preferably about 10 to 30.

  The average thickness of the fabric is, for example, about 0.2 to 2.0 mm, preferably about 0.2 to 1.0 mm, and more preferably about 0.3 to 0.7 mm.

  As a resin component, the resin illustrated as a base resin of the said silicone modified resin can be utilized individually or in combination of 2 or more types. Among the resins, a resin of the same type as the silicone-modified resin (that is, the same or the same type as the base resin of the silicone-modified resin) is preferable from the viewpoint that the adhesion with the non-adhesive layer can be improved. Therefore, when the silicone-modified resin is a silicone-modified polyurethane, the resin component of the core is preferably polyurethane. As the polyurethane, the polyurethane exemplified as the base resin of the silicone-modified resin can be used alone or in combination of two or more. Among the polyurethanes, polyether type polyurethane or polycarbonate type polyurethane is preferable for the same reason as the non-adhesive layer. The core polyurethane may also be combined with the curing agent exemplified in the non-adhesive layer. The ratio with respect to a preferable hardening | curing agent and a polyurethane is the same as that of a non-adhesion layer.

  The ratio of the resin component is, for example, about 10 to 100 parts by mass, preferably about 10 to 50 parts by mass with respect to 100 parts by mass of the fabric. If the ratio of the resin component is too small, the strength may be insufficient and the adhesion to the non-adhesive layer may be decreased, and if it is excessive, the flexibility required for the belt may be decreased.

  The core body may be formed of a single core body, but may be a laminated body of a plurality of core bodies. The number of cores in the laminate is not particularly limited, and is 2 or more (for example, 2 to 10), preferably about 2 to 5 (particularly 2 to 4).

  When forming a laminated body with a some core, you may interpose an intermediate | middle layer between cores. The intermediate layer is not particularly limited as long as the cores can be bonded to each other. Conventional adhesives and pressure-sensitive adhesives can be used, but the same resin component impregnated in the cores can be used from the viewpoint of improving the adhesion between the cores. Alternatively, it is preferable to use the same type of resin (particularly the same resin). The intermediate layer is usually formed using a sheet-like precursor similar to the cover layer.

  The average thickness of the intermediate layer is, for example, about 0.05 to 1 mm, preferably about 0.1 to 0.5 mm, and more preferably about 0.2 to 0.4 mm.

(Cover layer)
In the conveyance belt of the present invention, when a non-adhesive layer is formed on the conveyance surface of the core body, a cover (protection) layer containing a resin component may be formed on the inner peripheral surface side of the core body. As the resin component of the cover layer, the resins exemplified as the base resin of the silicone-modified resin can be used alone or in combination of two or more. Among the resins, it is preferable to use the same or the same kind of resin (particularly the same resin) as the resin component to be impregnated into the core fabric because it can improve the adhesion to the core. The cover layer is usually formed using a sheet-like precursor.

  The average thickness of the cover layer is, for example, 0.05 to 1 mm, preferably 0.1 to 0.5 mm, and more preferably about 0.2 to 0.4 mm.

[Conveying belt manufacturing method]
The conveyance belt of the present invention is obtained by a production method including a non-adhesive layer forming step of forming a non-adhesive layer on the conveyance surface and / or inner peripheral surface side of the core.

  In the non-adhesive layer forming step, the method for forming the non-adhesive layer can be selected according to the type of the non-adhesive layer. For example, when forming a non-adhesive film, a liquid composition containing a silicone-modified resin is used as the core. May be a coating method applied to the transport surface and / or inner peripheral surface of the sheet, and in the case of forming a non-adhesive cover layer, a laminating method of laminating the sheet-like precursor on the transport surface and / or inner peripheral surface of the core body Etc.

  In the coating method, the liquid composition usually contains a solvent for dissolving or dispersing the silicone-modified resin. The solvent can be appropriately selected according to the type of the silicone-modified resin. When the silicone-modified resin is a silicone-modified polyurethane, for example, hydrocarbons (for example, alicyclic hydrocarbons such as cyclohexane, aromatics such as toluene and xylene, etc. Aromatic hydrocarbons), halogenated hydrocarbons (chloroform, dichloromethane, etc.), ethers (chain ethers such as diethyl ether, cyclic ethers such as dioxane, tetrahydrofuran), ketones (acetone, methyl ethyl ketone, etc.), esters ( Methyl acetate, ethyl acetate, etc.), amides (eg, formamide, N, N-dimethylformamide, etc.), nitriles (eg, acetonitrile, etc.), sulfoxides (eg, dimethyl sulfoxide, etc.), and the like. These organic solvents can be used alone or as a mixed solvent. Of these solvents, hydrocarbons and ketones are widely used. The density | concentration of the silicone modified resin in a liquid composition is 1-50 mass%, for example, Preferably it is 3-30 mass%, More preferably, it is about 5-25 mass%.

  As the coating method, a conventional method such as a bar coating method, a roll coating method, a knife coating method, a spray coating method, a brush coating method, or a dipping method can be used. Of these, the bar coating method, roll coating method, knife coating method and the like are widely used.

  After coating, it may be heated and dried. The heating temperature may be, for example, 60 to 200 ° C, preferably 80 to 160 ° C, and more preferably about 100 to 140 ° C. The heating time may be, for example, 1 minute or longer, for example, 1 to 30 minutes, preferably about 5 to 10 minutes.

  In the laminating method, the sheet-shaped precursor may be laminated with the core in a molten state or a non-molten state, and when laminated in a non-molten state, it is integrated with the core through a conventional adhesive or pressure-sensitive adhesive. However, from the viewpoint of being able to be firmly integrated by a simple method, it is preferable that the core is laminated in a molten state and bonded by solidification. The heating temperature for melting the sheet-like precursor can be selected according to the type of the silicone-modified resin, but in the case of silicone-modified polyurethane, it may be, for example, 100 ° C. or more, preferably 100 to 200 ° C. Preferably it is about 120-180 degreeC. In the heating, pressurization may be performed, and the pressure is, for example, about 0.1 MPa or more, preferably 0.1 to 0.6 MPa, and more preferably about 0.2 to 0.5 MPa. The heating time may be, for example, 10 seconds or longer, for example, 30 seconds to 10 minutes, preferably about 1 to 5 minutes.

  The non-adhesive cover layer obtained by the laminating method has a conventional method as a method for forming a concavo-convex structure when a convex part (concavo-convex structure) is formed on the surface in order to improve the non-adhesiveness with the conveyed product. Can be used, but from the standpoint of simplicity etc., the release sheet having the mold with the target concavo-convex structure and reversed mold is laminated and solidified on the non-adhesive cover layer in a molten state, and then the release sheet is peeled off. The method is preferred. As a condition for melting the non-adhesive cover layer, the heating temperature can be selected according to the type of the silicone-modified resin, but in the case of the silicone-modified polyurethane, it may be, for example, 100 ° C. or more, preferably 100 to 170 ° C., More preferably, it is about 120-160 degreeC. In the heating, pressurization may be performed, and the pressure is, for example, about 0.1 MPa or more, preferably 0.1 to 0.6 MPa, and more preferably about 0.2 to 0.5 MPa. The heating time may be, for example, 1 minute or longer, for example, 1 to 5 minutes, preferably about 1.5 to 4 minutes.

  As a manufacturing method of the core, a conventional method can be used, and examples thereof include a method of impregnating a fabric with a liquid composition containing a resin component (such as the method described in Patent Document 2). As the solvent for the liquid composition, the solvents exemplified as the liquid composition for forming the non-adhesive film can be used. The density | concentration of the resin component in a liquid composition is 5-50 mass%, for example, Preferably it is 10-30 mass%, More preferably, it is about 15-20 mass%. Furthermore, when laminating a plurality of cores, heating may be performed with a sheet-like precursor for the intermediate layer interposed between the fabrics. The conditions for heating and pressurization can be selected according to the type of the resin component.

  The form of the obtained transport belt is not particularly limited, and may be a belt (seamless belt) that does not have a joint, but is usually an endless belt that joins both ends. FIG. 3 is a side view of the transport belt of the present invention prepared endlessly and attached to a pulley. As shown in FIG. 3, the obtained conveyance belt 10 is prepared by joining both ends to be an endless belt, and is then wound around a drive pulley 11 and a driven pulley 12 for use. Specifically, a transported object such as food is placed on the transport belt 10 attached to the pulley, and can be transported from the driven pulley 12 side to the drive pulley 11 side.

  The method for joining the both ends of the obtained conveyor belt is not particularly limited. Usually, however, both ends are formed in a non-linear shape such as a zigzag shape (lightning shape) in order to firmly fix the joined portion. A method of covering with a reinforcing member is used.

  4 and 5 are a plan view and a side view of the joining portion of the conveyor belt of the present invention prepared in an endless manner. As shown in FIG. 4, first, the obtained transport belt is cut in zigzag (lightning shape) at both ends in the longitudinal direction, and the cut ends are abutted with each other. Next, as shown in FIGS. 4 and 5, a reinforcing member 10a [for example, a sheet of a material similar to the non-adhesive cover layer (for example, silicone-modified polyurethane), a woven fabric, etc. ] And using a hot plate press to join the reinforcing member together with the reinforcing member by pressurizing the joining portion of the conveyor belt.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

[Details of raw materials used]
(Liquid composition for forming non-adhesive layer)
Main component (resin component): Silicone modified thermoplastic polyurethane resin ("Diaroma SP" manufactured by Dainichi Seika Kogyo Co., Ltd.)
Solvent: Mixed solvent of toluene and methyl ethyl ketone (toluene / methyl ethyl ketone = 70/10 (weight ratio))
Solid content concentration: 20% by mass
Curing agent: polyisocyanate composition (“Crosnate D” manufactured by Dainichi Seika Kogyo Co., Ltd.)
Solvent: Ethyl acetate Solid content concentration: 50% by mass
Compounding ratio of curing agent: 10 parts by mass with respect to 100 parts by mass of the resin component.

(Sheet-like precursor 1 for forming a non-adhesive cover layer)
Silicone-modified polyether type urethane elastomer sheet ("Rezamin PS" manufactured by Dainichi Seika Kogyo Co., Ltd.), silicone content 8% by mass, thickness 0.3mm
(Sheet-like precursor 2 for forming a non-adhesive cover layer)
Silicone-modified polyether-type urethane elastomer sheet ("Rezamin PS" manufactured by Dainichi Seika Kogyo Co., Ltd.), silicone content 16% by mass, thickness 0.3mm
(Sheet-like precursor 3 for forming a non-adhesive cover layer)
Silicone-modified polycarbonate urethane elastomer sheet ("Rezamin PS" manufactured by Dainichi Seika Kogyo Co., Ltd., silicone content 8% by mass, thickness 0.3mm
(Sheet-like precursor 4 for forming a non-adhesive cover layer)
Silicone-modified polycarbonate urethane elastomer sheet ("Rezamin PS" manufactured by Dainichi Seika Kogyo Co., Ltd., silicone content 16% by mass, thickness 0.3mm
(Sheet-like precursor 5 for forming a non-adhesive cover layer)
Silicone-modified polycarbonate urethane elastomer sheet ("Rezamin PS" manufactured by Dainichi Seika Kogyo Co., Ltd., silicone content 8% by mass, thickness 1.1mm
(Sheet-like precursor 6 for forming a non-adhesive cover layer)
Silicone-modified polycarbonate urethane elastomer sheet ("Rezamin PS" manufactured by Dainichi Seika Kogyo Co., Ltd., silicone content 8% by mass, thickness 2.1mm
(Material for forming the core)
Plain woven fabric [warp: polyester spun yarn (thickness: 20 count, number of twists: 2, yarn density: 78 / 5cm)], [weft: polyester monofilament (fineness: 660 dtex, number of twists: 1, yarn density: 68 / 5cm)]
Resin component: Polyether-type thermoplastic polyurethane resin (reaction product of polytetramethylene ether glycol and MDI)
Solvent: Mixed solvent of methyl ethyl ketone, cyclohexane and tetrahydrofuran (methyl ethyl ketone / cyclohexane / THF = 15/45/40 (weight ratio))
Curing agent: polyisocyanate composition Solid content concentration: 25% by mass.

(Sheet-like precursor 1 for forming a cover layer)
Polyether type urethane elastomer sheet, thickness 0.3mm
(Sheet-like precursor 2 for forming a cover layer)
Polycarbonate type urethane elastomer sheet, thickness 0.3mm
(Release paper)
Lattice-like concavo-convex pattern (the non-adhesive layer after transfer has a concavo-convex pattern in which one side of the square is approximately 0.38 mm, the interval between adjacent protrusions is approximately 0.44 mm, and the height of the protrusions is approximately 0.1 mm) Release paper with.

[Average thickness of non-adhesive layer]
The average thickness of the non-adhesive layer (non-adhesive film or non-adhesive cover layer) was obtained by observing the cross section of the conveyor belt using a scanning electron microscope and calculating the average value of the thicknesses at three locations.

[Evaluation of non-adhesiveness (peeling force) of transport surface]
The transport belts obtained in the examples and comparative examples were cut into predetermined dimensions (width 190 mm, length 280 mm) to obtain test pieces, and the length of the test was placed on a horizontally movable base (rectangular base). Fix the vertical direction parallel to the length of the table. Next, a cellophane tape (width 15 mm, length 300 mm) is placed in the center of the surface (conveying surface) of the test piece, with the length direction of the cellophane tape parallel to the length direction of the table and the test piece, Press and stick with a roller. Furthermore, the load cell is fixed on one side in the length direction of the table, and one end of the cellophane tape opposite to the side on which the load cell is fixed and the tip of the string fastened to the load cell are fixed with a clip. . The table is moved in the length direction at a rate of 300 mm / min toward the direction away from the load cell, the cellophane tape is peeled in the direction of 180 degrees from the surface of the test piece, and the peeling force is measured. The peeling force was an average value excluding the initial peak value after peeling.

[Durability evaluation (running test)]
Both ends of the conveyor belts obtained in Examples 8, 10 and 11 were formed in a zigzag shape (lightning shape). The obtained both ends were butted against each other, and the same sheet (width 100 mm, length about 50 mm) as the sheet-like precursor 3 for forming the non-adhesive cover layer was covered as a reinforcing layer so as to cover the joint portion. Then, it joined by heat sealing | fusion, and it was formed with the junction part reinforced with the belt main-body part and the reinforcement layer, and produced the endless conveyance belt of width 100mm and length 1500mm.

  The obtained endless conveyor belt is placed on a 5-axis running test machine (pulley diameter: 15 mm) whose schematic layout is shown in FIG. 6, and subjected to a running test under conditions of belt tension: 3 N / mm and number of bendings: 2 million times. Provided. In addition, about the conveyance belt obtained in Example 11, the driving | running | working test was further done with the 5-axis driving | running | working testing machine with a pulley diameter of 50 mm.

  About the conveyance belt before a running test and after a test, belt strength was measured with the tension test method based on JISK6376, and the strength retention was computed based on the following formula. In addition, the test part was extract | collected from the belt main body part which does not include a junction part, and the joint part of the belt strength measurement site | part. Moreover, in the junction part, it extract | collected so that a junction part might be arrange | positioned in the center of a test piece.

    Strength retention rate = strength after running test / strength before running test x 100 (%)

  As the evaluation of the strength retention rate, if the belt strength after the running test was 30 N / mm or more and the strength retention rate was 50% or more, it was judged that the belt could be practically used.

  Furthermore, the belt surface state after the running test was also visually observed, and if there were no abnormalities such as cracks, it was determined that the belt could be practically used (no abnormality).

Comparative Example 1
A plain woven fabric is dipped in a liquid composition containing a resin component and a curing agent for 0.5 minutes, taken out, heated at 120 ° C. for 5 minutes, dried to remove the solvent, and a core (conveying belt) Got. An adhesive was fixed on the surface of the core.

Example 1
The surface of the core obtained in Comparative Example 1 was coated with a liquid composition for forming a non-stick film using a knife coating method, and then heated at 120 ° C. for 5 minutes to dry to remove the solvent. Thus, a transport belt having a thin non-adhesive film laminated on the core was obtained. The average thickness of the non-adhesive film was 25 μm.

  Table 1 shows the results of evaluating the non-adhesiveness of the conveyor belts obtained in Comparative Example 1 and Example 1.

  As is clear from Table 1, the peel strength of Example 1 was much smaller than that of Comparative Example 1, and the non-adhesiveness was improved.

Comparative Example 2
A sheet-like precursor 1 for forming a cover layer is laminated on the surface of the core obtained in Comparative Example 1, and is heated and pressed at 150 ° C. and 0.3 MPa for 5 minutes using a press machine. After the precursor was melted, it was cooled and solidified to obtain a conveyor belt in which a thick cover layer was laminated on the core. The average thickness of the cover layer was 0.2 mm.

Example 2
A transport belt was obtained in the same manner as in Comparative Example 2 except that the sheet-like precursor 1 for forming the non-adhesive cover layer was used instead of the sheet-like precursor 1 for forming the cover layer. The average thickness of the non-adhesive cover layer was 0.2 mm.

Example 3
A transport belt was obtained in the same manner as in Comparative Example 2 except that the sheet-like precursor 2 for forming the non-adhesive cover layer was used instead of the sheet-like precursor 1 for forming the cover layer. The average thickness of the non-adhesive cover layer was 0.2 mm.

Comparative Example 3 and Examples 4-5
Release paper was laminated on the cover layer or non-adhesive cover layer of the conveyor belt obtained in Comparative Example 2 and Examples 2-3, respectively, and heated at 150 ° C. and 0.3 MPa for 5 minutes using a press machine. After pressing and melting the cover layer or the non-adhesive cover layer, it was cooled and solidified. Furthermore, the release paper was peeled from the cover layer or the non-adhesive cover layer, and an uneven structure was formed on the surface of the cover layer or the non-adhesive cover layer.

Comparative Example 4
A sheet-like precursor 2 for forming a cover layer is laminated on the surface of the core obtained in Comparative Example 1, and is heated and pressed at 150 ° C. and 0.3 MPa for 5 minutes using a press machine. After the precursor was melted, it was cooled and solidified to obtain a transport belt in which a thick non-adhesive cover layer was laminated on the core. The average thickness of the non-adhesive cover layer was 0.2 mm.

Example 6
A transport belt was obtained in the same manner as in Comparative Example 2 except that the sheet-like precursor 3 for forming the non-adhesive cover layer was used instead of the sheet-like precursor 2 for forming the cover layer. The average thickness of the non-adhesive cover layer was 0.2 mm.

Example 7
A transport belt was obtained in the same manner as in Comparative Example 2, except that the sheet precursor 4 for forming the non-adhesive cover layer was used instead of the sheet precursor 2 for forming the cover layer. The average thickness of the non-adhesive cover layer was 0.2 mm.

Comparative Example 5 and Examples 8-9
Release paper was laminated on the cover layer or non-adhesive cover layer of the conveyor belt obtained in Comparative Example 4 and Examples 6 to 7, respectively, and heated at 150 ° C. and 0.3 MPa for 5 minutes using a press machine. After pressing and melting the cover layer or the non-adhesive cover layer, it was cooled and solidified. Furthermore, the release paper was peeled from the cover layer or the non-adhesive cover layer, and an uneven structure was formed on the surface of the cover layer or the non-adhesive cover layer.

Example 10
A transport belt was obtained in the same manner as in Comparative Example 2 except that the sheet-like precursor 5 for forming the non-adhesive cover layer was used instead of the sheet-like precursor 1 for forming the cover layer. The average thickness of the non-adhesive cover layer was 1 mm.

  A release paper is laminated on the non-adhesive cover layer of the obtained transport belt, and is heated and pressed at 150 ° C. and 0.3 MPa for 5 minutes using a press machine to melt the non-adhesive cover layer, and then cooled. And solidified. Further, the release paper was peeled from the non-adhesive cover layer, and an uneven structure was formed on the surface of the non-adhesive cover layer.

Example 11
A transport belt was obtained in the same manner as in Comparative Example 2 except that the sheet-like precursor 6 for forming the non-adhesive cover layer was used instead of the sheet-like precursor 1 for forming the cover layer. The average thickness of the non-adhesive cover layer was 2 mm.

  A release paper is laminated on the non-adhesive cover layer of the obtained transport belt, and is heated and pressed at 150 ° C. and 0.3 MPa for 5 minutes using a press machine to melt the non-adhesive cover layer, and then cooled. And solidified. Further, the release paper was peeled from the non-adhesive cover layer, and an uneven structure was formed on the surface of the non-adhesive cover layer.

  Table 2 shows the results of evaluating the non-adhesiveness of the conveyor belts obtained in Comparative Examples 2 to 5 and Examples 2 to 11.

  From the results shown in Table 2, there was a tendency that the peeling force decreased as the silicone content increased. Further, when the non-adhesive cover layer and the surface uneven structure were combined, the non-adhesiveness could be remarkably improved.

  Table 3 shows the results of running tests on the conveyor belts obtained in Examples 8, 10 and 11.

  In each of Examples 8 and 10, the belt strength after the running test was 30 N / mm or more, the strength retention rate was 50% or more, and the belt surface state was not abnormal in both the belt main body and the joined portion. As practical as possible.

  In Example 11 where the thickness of the non-adhesive cover layer was large (2 mm), although the belt strength after the running test was 30 N / mm or more and the strength retention was 50% or more, cracks occurred on the belt surface. It was impossible to use under traveling conditions with a pulley diameter of 15 mm. However, as a result of carrying out the same running test with a larger pulley (pulley diameter 50 mm), the belt strength after the running test is 30 N / mm or more, the strength retention is 50% or more, and the belt surface condition is also abnormal. Since it was not present, it was sufficiently practical as a conveyor belt.

  From these experimental results, if the thickness of the non-adhesive cover layer is large, the bendability is slightly lowered, so it cannot be applied to a travel layout that requires winding on a pulley with a small diameter, but the diameter of the pulley to be wound is large. The layout proved to be practical enough.

  The transport belt of the present invention can be used as a transport belt (conveyor belt) for various articles such as agricultural products, foods, and industrial products, and is excellent in releasability. Therefore, the transport belt is highly sticky articles (for example, food such as bread dough and confectionery dough). ).

1 ... Non-adhesive film 2,4 ... Core 3 ... Non-adhesive cover layer

Claims (15)

  A transport belt comprising a core and a non-adhesive layer formed on the transport surface and / or inner peripheral surface of the core and containing a silicone-modified resin containing an organosiloxane unit.   The conveyor belt according to claim 1, wherein the silicone-modified resin is a thermoplastic resin or a thermoplastic elastomer.   The conveyance belt according to claim 1 or 2, wherein the ratio of the organosiloxane unit is 5 to 20% by mass with respect to the entire silicone-modified resin.   The conveyor belt according to claim 1, wherein the silicone-modified resin is a silicone-modified polyurethane.   The transport belt according to claim 4, wherein the silicone-modified polyurethane is a silicone-modified resin of polyether type polyurethane or polycarbonate type polyurethane.   The conveyor belt according to any one of claims 1 to 5, wherein the core includes a fabric and a resin component, and the resin component is the same type of resin as the silicone-modified resin.   The conveyance belt according to claim 1, wherein the non-adhesive layer is a non-adhesive film having an average thickness of 10 to 100 μm.   The transport belt according to claim 7, wherein the non-adhesive film contains a curing agent.   The conveyance belt according to claim 1, wherein the non-adhesive layer is a non-adhesive cover layer having an average thickness of 0.1 to 2 mm.   The conveyance belt according to claim 9, wherein a plurality of convex portions are formed in the vertical and horizontal directions on the surface of the non-adhesive cover layer.   The core body further includes a second core body in addition to the first core body, and an intermediate layer is interposed between the first core body and the second core body. The conveyor belt as described in 2.   The transport belt according to any one of claims 1 to 11, wherein a non-adhesive layer is formed on the transport surface side of the core body, and a cover layer containing a resin component is formed on the inner peripheral surface side of the core body.   The manufacturing method of the conveyance belt in any one of Claims 1-12 including the non-adhesion layer formation process of forming a non-adhesion layer in the conveyance surface and / or inner peripheral surface side of a core.   The manufacturing method of Claim 13 which apply | coats the liquid composition containing silicone modified resin to the conveyance surface and / or inner peripheral surface of a core body in a non-adhesion layer formation process, and forms a non-adhesion film | membrane.   The manufacturing method of Claim 13 which forms a non-adhesive cover layer by laminating | stacking a sheet-like precursor on the conveyance surface and / or inner peripheral surface of a core body in a non-adhesive layer formation process.

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