JP6823223B1 - Conveyance belt and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transport belt having high visibility of a mark and capable of transporting a transported object without contaminating the transported object. SOLUTION: The information is laminated on a core body 1, a protective layer 2 laminated on a transport surface of the core body 1 and containing a resin component, and laminated on at least a part of the surface of the protective layer. A transparent non-adhesive layer 4 which is laminated on the mark layer 3 and the protective layer on which the mark layer is laminated, has a plurality of convex portions formed in the vertical and horizontal directions of the surface, and contains a silicone-modified resin containing an organosiloxane unit. A transport belt containing and is manufactured. The silicone-modified resin may be a silicone-modified polyurethane (particularly, a silicone-modified resin of a polyether-type polyurethane or a polycarbonate-type polyurethane). The mark layer may be formed of an ink composition in a part of a region of the protective layer. [Selection diagram] Fig. 1

Description

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

As a transport belt used to transport various types of food such as food, positioning marks, PR marks, trademarks, specification explanations, etc. are provided on the transport surface to make it easier to understand the position of the transport, the details of processing, etc. Transport belts that display marks (figures, lines, letters) are known. As such a transport belt, a transport belt in which a thermoplastic resin sheet (film) on which a mark is drawn in advance is welded or directly drawn on the transport surface by inkjet printing is known.

According to Japanese Patent Application Laid-Open No. 2-69610 (Patent Document 1), a conveyor belt having a basic structure made of a thermoplastic material having a woven fabric on at least one side surface, which is planned to receive a product to be transported. A conveyor belt provided by performing information retention printing by press transfer printing or transfer sublimation process on the belt surface of the above is disclosed.

In Japanese Patent Application Laid-Open No. 7-309414 (Patent Document 2), a tension material and an elastomer sheet are laminated, a mark composed of dots is printed on the surface of the elastomer sheet, and a transparent sheet is further laminated on the mark. The transport belt is disclosed.

Further, a transport belt with a mark is also used in a transport belt for transporting an adhesive transport object (article) such as bread or confectionery dough. In such applications, in order to prevent the transported object from adhering to the transport surface of the transport belt, the core canvas is used as the transport surface, and the unevenness (woven pattern) of the core canvas improves the peelability. Belts are also known.

Japanese Patent Application Laid-Open No. 2016-120116 (Patent Document 3) has transparency, and is laminated on the lower side of the first core canvas layer containing the canvas material and the first core canvas layer to provide transparency. A first resin layer containing a resin, a mark layer including a mark laminated under the first resin layer and transmitting information to the outside, and a protective layer laminated under the mark layer. A transport belt in which is laminated is disclosed.

On the other hand, Japanese Patent Application Laid-Open No. 2016-183049 (Patent Document 4) contains a core body and a non-silicone modified resin formed on the transport surface and / or inner peripheral surface side of the core body and containing an organosiloxane unit. A transport belt including an adhesive layer is disclosed.

Jikkenhei 2-69610 (Claim 1 of the Claims for Utility Model Registration) JP-A-7-309414 (Claim 1) JP-A-2016-12101 (Claim 1) JP-A-2016-183049 (Claim 1)

However, in the transport belts of Patent Documents 1 and 2, since the adhesion of the ink or film to the transport surface having irregularities such as woven fabric is low, the ink or film is likely to peel off during transport. Further, even in the transport belt of Patent Document 2, the transparent sheet is likely to be peeled off at the contact portion between the mark (ink layer) and the transparent sheet. There is a risk that the peeled material will adhere to and mix with the transported material as foreign matter, but this will be a major problem in food processing processes such as bread and confectionery dough.

On the other hand, in the transport belt of Patent Document 3, a transparent woven fabric material is used as the surface layer, and the internal mark can be visually recognized from the canvas surface, but the mark seen through the woven fabric has a fine pattern or a light color. The mark is difficult to see, and the visibility is low, such as lack of sharpness of characters and colors. Further, in a food production line or the like, when a substance adhering from a transported object (food) is rubbed into the threads of the woven fabric and clogged, the visibility of the mark is further lowered. Therefore, the belt whose surface layer is a canvas layer is excellent in non-adhesiveness to the conveyed object, but the visibility of the mark is low.

Note that Patent Document 4 does not describe the mark.

Therefore, an object of the present invention is to provide a transport belt having high visibility of marks and capable of transporting a transported object without contaminating the transported object, and a method for manufacturing the same.

Another object of the present invention is to provide a transport belt having excellent transportability of a highly sticky transported material (food such as bread dough) and suppressing peeling between layers, and a method for producing the same.

As a result of diligent studies to achieve the above problems, the present inventors have formed a protective layer containing a resin component, a mark layer, and a plurality of convex portions in the vertical and horizontal directions of the surface on the transport surface of the core body, and the organosiloxane. The present invention has been completed by finding that the visibility of marks can be improved and the conveyed material can be conveyed without contaminating the conveyed material by sequentially laminating transparent non-adhesive layers containing a silicone-modified resin containing a unit.

That is, the transport belt of the present invention transmits information laminated on the core body, the protective layer laminated on the transport surface of the core body and containing a resin component, and laminated on at least a part of the surface of the protective layer. A transparent non-adhesive layer containing a mark layer for the purpose and a silicone-modified resin containing an organosiloxane unit, which is laminated on the protective layer on which the mark layer is laminated to form a plurality of convex portions in the vertical and horizontal directions of the surface. And include. The silicone-modified resin may be a thermoplastic resin or a thermoplastic elastomer. The ratio of the organosiloxane unit may be 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 silicone-modified resin of a polyether-type polyurethane or a polycarbonate-type polyurethane). In particular, the silicone-modified resin may be a polycarbonate-type polyurethane containing 3 to 15% by mass of an organosiloxane unit. The resin component of the protective layer may be the same type of resin as the base resin of the silicone-modified resin. The core body may contain a fabric and a resin component, and the resin component may be the same type of resin as the base resin of the silicone-modified resin. The mark layer may be formed of an ink composition in a part of a region of the protective layer. The average thickness of the transparent non-adhesive layer may be 0.1 to 0.6 mm.

The method for producing a transport belt of the present invention may include a step of forming a transparent non-adhesive layer in which a transparent non-adhesive layer precursor is laminated on the transport surface side of the core precursor. The production method of the present invention is a step of forming a protective layer in which a protective layer precursor is laminated on a transport surface of a core precursor, and a mark layer forming in which a mark layer precursor is laminated on at least a part of the surface of the protective layer precursor. Step, transparent non-adhesive layer forming step of laminating a transparent non-adhesive layer precursor on a protective layer precursor on which the mark layer precursor is laminated to obtain a transport belt precursor, hot-pressing the transport belt precursor. It may be a manufacturing method including a hot pressing step of integrating with each other. In the heat pressing step, a convex portion may be formed on the surface of the transparent non-adhesive layer after the heat pressing or by using a mold together with the heat pressing.

In the present invention, a protective layer containing a resin component, a mark layer, and a transparent non-adhesive layer containing a silicone-modified resin containing an organosiloxane unit and having a plurality of convex portions in the vertical and horizontal directions of the surface are formed on the transport surface of the core body. Since the marks are sequentially laminated, the visibility of the marks can be improved and the transported object can be transported without being contaminated. Furthermore, by combining the protective layer and the transparent non-adhesive layer in a specific combination, it is possible to improve the transportability of highly adhesive transported materials (food such as bread dough), and even if the mark layer is present, the layers can be peeled off. Can be suppressed. In particular, by adjusting the thickness of the transparent non-adhesive layer formed of a specific silicone-modified resin to a specific range, transportability (non-adhesiveness) and interlayer adhesion (adhesiveness), which are in a trade-off relationship, can be obtained. It is compatible, has excellent non-adhesive durability, and can improve visibility. Specifically, even if the belt is run for a long time, it is possible to suppress the decrease in non-adhesiveness due to wear, reduce the occurrence of interference patterns (moire) due to the surface pattern, and it is important for automation of production. Decoding the pattern is also easy.

FIG. 1 is a schematic view showing an example of a transport belt of the present invention. FIG. 2 is a side view of the transport belt of the present invention prepared in an endless shape and mounted on a pulley. FIG. 3 is a plan view of a joint portion of the transport belt of the present invention prepared in an endless shape. FIG. 4 is a diagram showing the shape of the mark layer of the transport belt obtained in the embodiment. FIG. 5 is a schematic view showing a method of evaluating the visibility of the embodiment. FIG. 6 is a schematic view showing the transport belt obtained in the second embodiment. FIG. 7 is a schematic view showing the transport belt obtained in Example 3. FIG. 8 is a schematic view showing the transport belt obtained in Example 4. FIG. 9 is a schematic view showing the transport belt obtained in Comparative Example 1. FIG. 10 is a schematic view showing the transport belt obtained in Comparative Example 4. FIG. 11 is a schematic view for explaining a running test of the transport belt obtained in the embodiment.

[Convey belt]
The transport belt of the present invention is for transmitting information laminated on a core body, a protective layer laminated on the transport surface of the core body and containing a resin component, and laminated on at least a part of the surface of the protective layer. It contains a mark layer and a silicone-modified resin which is laminated on the protective layer in which the mark layer is laminated in at least a part of a region, has a plurality of protrusions formed in the vertical and horizontal directions of the surface, and contains an organosiloxane unit. Includes a transparent non-adhesive layer.

FIG. 1 is a schematic view showing an example of a transport belt of the present invention, the core body 1, the protective layer 2 laminated on the transport surface side of the core body 1, and a part of the surface of the protective layer 2. It is formed of a mark layer 3 laminated in a region and a transparent non-adhesive layer 4 laminated on the protective layer 2 in which the mark layer 3 is laminated in a part of the region. In a transport belt having such a transparent non-adhesive layer, since the transparent non-adhesive layer is transparent and has excellent releasability, the visibility of the mark can be improved and the transported object can be transported without being contaminated. In this schematic view, the convex shape formed on the surface of the transparent non-adhesive layer is omitted.

(Transparent non-adhesive layer)
In the present invention, since the transparent non-adhesive layer contains a silicone-modified resin in which a plurality of convex portions are formed in the vertical and horizontal directions of the surface and contains an organosiloxane unit, it is possible to prevent the transported object from adhering to the transport belt.

In the silicone-modified resin contained in the transparent non-adhesive layer, the base resin is modified with a silicone component, and more specifically, the organosiloxane unit (silicone unit) is copolymerized and incorporated in the molecule of the base resin. The base resin (base resin unit) can improve the adhesion to the protective layer, and the silicone component can suppress the adhesion of the conveyed material.

The organosiloxane unit is represented by the formula: -Si (-R) _2- O- (in the formula, the group R is a substituent), and the substituent represented by the group R includes an alkyl group, an aryl group, and the like. Cycloalkyl groups and the like can be mentioned. 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 (trill), 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. Of these substituents, a C _1-3 alkyl group such as a methyl group and a C _6-12 aryl group such as a phenyl group are widely used.

The form of introducing 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 the side chain. The introduction method can be selected according to the type of base resin, and is based on a (poly) organosiloxane monomer having an ethylenically unsaturated bond (vinyl group, etc.) or a reactive group (hydroxyl group, amino group, carboxyl group, etc.). It may be introduced by reacting (polymerizing) with a resin or a monomer thereof. The form of copolymerization is not particularly limited, and may be any of random copolymerization, block copolymerization, and graft copolymerization. Organosiloxane units are often derived from polyorganosiloxane diols.

The molecular weight of the organosiloxane unit (polyorganosiloxane diol) is, for example, 100 to 50,000, preferably 500 to 10,000.

The ratio of the organosiloxane unit can be selected from the range of about 1 to 50% by mass with respect 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. Most preferably, it is 6 to 18% by mass. In particular, the proportion of the organosiloxane unit is preferably 3 to 15% by mass, preferably 3 to 15% by mass, based on the entire silicone-modified resin, from the viewpoint of improving the bonding strength with the protective layer having the mark layer while maintaining the non-adhesiveness to the transported material. May be 4 to 12% by mass, more preferably 5 to 10% by mass, and most preferably 6 to 9% by mass. If the proportion of the organosiloxane unit is too small, the non-adhesiveness to the conveyed material may decrease, and conversely, if the proportion is too large, the adhesion to the protective layer may decrease.

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 polyolefins, (meth) acrylic resins, polyesters, polyacetals, polycarbonates, polyurethanes, and polyimides. In the case of thermoplastic elastomers, examples of the base resin include polyolefin elastomers, polyester elastomers, polyamide elastomers, polyurethane elastomers and the like. These base resins can be used alone or in combination of two or more.

Among these base resins, a thermoplastic resin or a thermoplastic elastomer is preferable, and a polyurethane or a polyurethane elastomer is particularly preferable, from the viewpoint of handleability and flexibility.

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

Examples of the polyols include polyester polyols (including polycaprolactones), polyether polyols, polyether ester polyols, polycarbonate polyols, polyesteramide polyols, acrylic polymer polyols and the like. These polyols can be used alone or in combination of two or more. Among these polyols, polyether polyols (poly C _2-4 alkylene glycol such as polyethylene glycol and polytetramethylene glycol ether) and polycarbonate polyols (ethylene glycol and 1,1) are excellent in water resistance and chemical resistance. Reaction products of C _2-6 alkanediol such as 4-butanediol and di C _1-4 alkyl carbonate such as dimethyl carbonate or di C _6-12 aryl carbonate such as diphenyl carbonate) are preferred.

Polyisocyanates include, for example, aliphatic diisocyanates such as aliphatic polyisocyanates [propylene diisocyanate, trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate (HDI), trimethylhexamethylene diisocyanate (TMDI), lysine diisocyanate (LDI), etc. , 1,6,11-Undecantryisocyanate Methyloctane, 1,3,6-hexamethylene triisocyanate and other aliphatic triisocyanates], alicyclic polyisocyanate [cyclohexane-1,4-diisocyanate, isophorone diisocyanate (IPDI) , Hydrocyclic xylylene diisocyanate, alicyclic diisocyanate such as hydrogenated bis (isocyanatophenyl) methane, alicyclic triisocyanate such as bicycloheptane triisocyanate], aromatic polyisocyanate [phenylenediocyanate, tolylene diisocyanate ( TDI), xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate (TMXDI), naphthalenediocyanate (NDI), bis (isocyanatophenyl) methane (MDI), toluidine diisocyanate (TODI), 1,3-bis (isocyanato) Phenyl) Aromatic diisocyanates such as propane] and the like are included.

These polyisocyanates are multimers [dimers, trimers (polyisocyanates having an isocyanurate ring), tetramers, etc.], adducts, modified products (biuret modified products, alohanate modified products, urea modified products, etc.). Etc.), or a urethane oligomer having a plurality of isocyanate groups.

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, aromatic aliphatic diisocyanates such as XDI, and aromatic diisocyanates such as MDI and TDI are widely used and are highly versatile. Aromatic diisocyanates are particularly preferred.

Among these polyurethanes, polyether type polyurethane and polycarbonate type polyurethane are preferable from the viewpoint of excellent water resistance and chemical resistance, and they are excellent in non-adhesiveness and transparency to the transported material, and have adhesion to a protective layer having a mark layer. Polycarbonate type polyurethane is particularly preferable from the viewpoint of improving the above.

When the silicone-modified resin is a silicone-modified polyurethane, the transparent non-adhesive layer may further contain a curing agent. As the curing agent, conventional curing agents such as polyisocyanates, polyols, and polyamines can be used and can be selected according to the type of polyurethane, but polyisocyanates are preferable from the viewpoint of reactivity and the like. As the polyisocyanates, the polyisocyanates can be used. Among the polyisocyanates, aromatic diisocyanates are preferable as the curing agent from the viewpoint of stable reactivity.

The ratio of the curing agent is, for example, 1 to 50 parts by mass, preferably 2 to 25 parts by mass, and more preferably 5 to 10 parts by mass with respect to 100 parts by mass of the silicone-modified polyurethane.

As the silicone-modified resin of the transparent non-adhesive layer, an elastomer-type polyurethane silicone-modified resin (silicone-modified polyurethane elastomer) that is not used in combination with a curing agent is preferable, and an elastomer-type polycarbonate-type polyurethane silicone-modified resin (silicone-modified polycarbonate type) is preferable. Polyurethane elastomer) is particularly preferred.

The transparent non-adhesive layer may further contain other resin components such as rubber, elastomer, and non-silicone modified polyurethane. The ratio of the other resin components is 30 parts by mass or less, preferably 0.1 to 20 parts by mass, and more preferably 1 to 10 parts by mass with respect to 100 parts by mass of the silicone-modified resin (particularly silicone-modified polyurethane).

The transparent non-adhesive layer contains conventional additives such as chain extenders, stabilizers (weather resistant stabilizers, antioxidants, thermal stabilizers, light stabilizers, etc.), fillers, plasticizers, lubricants, etc. May be good. 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, and more preferably 1 to 15 parts by mass with respect to 100 parts by mass of the silicone-modified resin (particularly silicone-modified polyurethane).

The total light transmittance of the transparent non-adhesive layer may be, for example, 50% or more, for example, 50 to 100%, preferably 60 to 100%, and more preferably 70 to 100%. If the total light rate is too low, the visibility of the mark may decrease. In the present application, the total light transmittance can be measured according to JIS K7361.

The average thickness of the transparent non-adhesive layer can be selected from the range of about 10 μm to 5 mm according to the type of belt and the type of manufacturing method, for example, 0.03 to 3 mm, preferably 0.05 to 1 mm (particularly 0.08 to 0.08 to 0.08 to 0.08 to 0). 0.7 mm), more preferably 0.1 to 0.6 mm (particularly 0.1 to 0.5 mm), more preferably 0.1 to 0.4 mm (particularly 0.15 to 0.3 mm), most preferably 0.15 to 0.3 mm. It is 0.1 to 0.3 mm (particularly 0.17 to 0.25 mm). If the thickness of the transparent non-adhesive layer is too thin, the non-adhesiveness and its durability may decrease, and if it is too thick, moire is likely to occur, and the visibility of the mark and the mechanical properties of the belt may decrease. There is.

In the present application, the average thickness of each layer can be measured by a method of observing the cross section of the transport belt using a scanning electron microscope and calculating the average value of the thicknesses at three locations. Further, when the mark layer described later is formed in a part of the protective layer, the thickness of the non-adhesive layer means the thickness in the region where the mark layer is formed.

Further, in the transparent non-adhesive layer, a plurality of convex portions are formed in the vertical and horizontal directions in order to improve the non-adhesiveness. The plurality of convex portions may be formed randomly or regularly at intervals 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, polygonal, circular, or elliptical. The average diameter of the planar shape of the convex portion is, for example, 0.1 to 10 mm, preferably 0.2 to 5 mm, and more preferably about 0.3 to 1 mm. The average distance between adjacent convex portions (distance between central portions) is, for example, 0.2 to 15 mm, preferably 0.3 to 10 mm, and more preferably 0.5 to 5 mm. The average height of the convex portion is, for example, 0.01 to 0.5 mm, preferably 0.03 to 0.3 mm, and more preferably 0.05 to 0.2 mm.

(Mark layer)
The mark layer is interposed between the transparent non-adhesive layer which is the outermost surface layer of the transport surface and the protective layer described later, and is interposed through the transparent non-adhesive layer which is transparent to the viewer of the transport belt. It is formed to convey information such as figures, lines, and characters.

The mark layer may be laminated on at least a part of the area of the protective layer, and the occupied area of the mark layer is not particularly limited, but from the viewpoint of visibility and interlayer adhesion, the area where the mark layer is laminated The area ratio is, for example, 1 to 99%, preferably 3 to 90%, more preferably 5 to 80%, and most preferably 10 to 50% with respect to the surface of the protective layer. If the area occupied by the mark layer is too small, the visibility of the mark may be lowered, and conversely, if it is too large, the interlayer adhesion may be lowered.

The mark layer may be formed of an ink composition. As the ink composition, a conventional ink composition can be used. The conventional ink composition may be a composition containing a colorant. As the colorant, conventional inorganic pigments and organic dyes can be used.

Examples of inorganic pigments include black pigments [carbon black (acetylene black, lamp black, thermal black, furnace black, channel black, Ketjen black, etc.), graphite, titanium black, black iron oxide, etc.] and white pigments [titanium-based pigments]. White pigments (titanium oxide, etc.), zinc-based white pigments (zinc oxide, zinc sulfide, etc.), composite white pigments (lithopon, etc.), extender pigments (magnesium silicate, calcium carbonate, barium sulfate, aluminum hydroxide, bentonite, etc.), etc. ], Yellow pigments [Kadomi yellow (Kadomi yellow), Yellow lead (Chrome yellow), Zinc chromate, Ocher, Yellow iron oxide (Mars yellow), etc.], Red pigments [Red pigment, amber, Red iron oxide (valve) Pattern, rust powder), cadmium red (fire red), lead tan (iron tetraoxide, Komeitan), etc.], orange pigment (molybdate orange, etc.), blue pigment [for example, navy blue, ultramarine blue, cobalt blue (tenal blue) ) Etc.], green pigments (for example, chrome green, cobalt green, viridian, etc.), purple pigments (manganese violet, etc.), cadmium pigments, lead pigments, cobalt pigments, etc.

Examples of organic dyes include azo dyes (pigment yellow, hanza yellow, benzidine yellow, permanent red, brilliant carmine 6B, etc.), phthalocyanine dyes (phthalocyanine blue, phthalocyanine green, etc.), and rake dyes (lake). Red, Watchyan Red, etc.), cyanine dyes, carbazole dyes, pyromethene dyes, anthracinone dyes, quinophthalone dyes, naphthoquinone dyes, triphenylmethane dyes, xantene dyes , Kinaclidene dyes, Perylene dyes, Perinone dyes, Kinonimine dyes, Metin dyes, Benzoquinone dyes, Naphthalimide dyes, Isoindrin dyes, Dioxazine dyes, Slen dyes Examples thereof include dyes, nitro dyes, and nitroso dyes.

These colorants can be used alone or in combination of two or more.

The ink composition may further contain a binder resin in addition to the colorant. Examples of the binder resin include acrylic resin, olefin resin, vinyl resin, styrene resin, polyether resin, polyketone resin, polyacetal resin, polyester resin, polyamide resin, urethane resin, and epoxy resin. Amino resin, butyral resin, cellulose ether, cellulose ester and the like can be mentioned. These binder resins can be used alone or in combination of two or more. These binder resins may be thermoplastic resins or curable resins. Further, these binder resins may be hydrophilic resins or hydrophobic resins.

The ratio of the colorant is, for example, 1 to 200 parts by mass, preferably 5 to 150 parts by mass, and more preferably 10 to 100 parts by mass with respect to 100 parts by mass of the binder resin. If the proportion of the colorant is too small, the visibility of the mark may decrease, and conversely, if the proportion of the colorant is too large, the productivity of the mark layer may decrease.

When the binder resin is a curable resin, the ink composition may further contain a cross-linking agent. Examples of the cross-linking agent include melamine compounds, benzoguanamine compounds, acrylate-based monomers, carbodiimide compounds, epoxy compounds, oxetane compounds, phenol compounds, benzoxazine compounds, caric acid compounds, isocyanate compounds, and silane coupling agents. The ratio of the cross-linking agent is 0.1 to 50 parts by mass, preferably 0.5 to 30 parts by mass, and more preferably 1 to 20 parts by mass with respect to 100 parts by mass of the binder resin.

The ink composition may further include conventional additives used in the ink. Conventional additives include, for example, dispersants or surfactants, hue improvers, dye fixers, surface tension modifiers or leveling agents, stabilizers (weatherproof stabilizers, antioxidants, heat stabilizers, light stabilizers). Etc.), fillers, plasticizers, lubricants, etc. The ratio of the additive is, for example, 0.1 to 100 parts by mass, preferably 1 to 80 parts by mass, and more preferably 3 to 50 parts by mass with respect to 100 parts by mass of the colorant.

(Protective layer)
The protective layer is formed so as to be interposed between the transparent non-adhesive layer (or mark layer) and the core body described later in order to improve the interlayer adhesion of the transport belt, and contains a resin component. As the resin component, the resin exemplified as the base resin of the silicone-modified resin contained in the transparent non-adhesive layer can be used alone or in combination of two or more.

When the mark layer is formed in a part of the protective layer, the resin component is the same as the silicone-modified resin (that is, silicone-modified) from the viewpoint of improving the adhesion to the transparent non-adhesive layer and the mark layer. A resin of the same or the same type as the base resin of the resin is preferable. Therefore, when the silicone-modified resin is silicone-modified polyurethane, polyurethane is preferable as the resin component of the protective layer. 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. Of the polyurethanes, polyether type polyurethane or polycarbonate type polyurethane is preferable from the viewpoint of being excellent in water resistance and chemical resistance and being able to improve adhesion to transparent non-adhesiveness, and being excellent in adhesion and economic efficiency. Polyether type polyurethane is particularly preferable. The polyurethane of the protective layer may also be combined with the curing agent exemplified in the section of the transparent non-adhesive layer, but like the transparent non-adhesive layer, an elastomer type that is not used in combination with the curing agent is preferable.

The protective layer may also contain conventional additives similar to the transparent non-adhesive layer. 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, and more preferably 1 to 15 parts by mass with respect to 100 parts by mass of the resin component (particularly silicone-modified polyurethane).

The average thickness of the protective layer is 10 μm or more and can be selected according to the type of belt and the type of manufacturing method. For example, 0.03 to 3 mm, preferably 0.05 to 1 mm, more preferably 0.1 to 0.5 mm. , More preferably 0.15 to 0.3 mm, most preferably 0.17 to 0.25 mm. If the thickness of the protective layer is too thin, the interlayer adhesion may decrease.

(Core body)
The core body contains a cloth and a resin component, and usually, the resin component is impregnated between the fibers inside the cloth. As the cloth (or canvas), a cloth commonly used for the core body of the transport belt can be used, and examples thereof include woven cloth and knitted cloth. Of these fabrics, woven fabrics are preferable because they are excellent in strength and productivity.

The weaving structure (woven structure) of the woven fabric may be, for example, a plain weave, a twill weave (oblique weave), a satin weave (satin weave), or the like. Among these woven structures, a plain weave may be used because of its excellent balance of strength and the like, and a twill weave and a satin weave structure may be used from the viewpoint of adhesion to a protective layer.

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

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

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

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

The average thickness of the fabrics (the average thickness of each fabric when a plurality of fabrics are combined) is, for example, 0.2 to 2.0 mm, preferably 0.2 to 1.0 mm, and more preferably 0.3 to 0.7 mm. Most preferably, it is 0.4 to 0.6 mm.

As the resin component, a resin of the same type as the resin component contained in the protective layer is preferable, a polyether type polyurethane or a polycarbonate type polyurethane is preferable, and a polyether type polyurethane is particularly preferable, from the viewpoint of improving the interlayer adhesion. The core polyurethane may also be combined with the curing agent exemplified in the section on transparent non-adhesive layers. As the core polyurethane, a prepolymer type polyurethane used in combination with a curing agent is preferable to an elastomer type polyurethane. The proportions and preferred embodiments of the curing agent are similar to those of the transparent non-adhesive layer curing agent.

The ratio of the resin component is, for example, 10 to 100 parts by mass, preferably 10 to 50 parts by mass with respect to 100 parts by mass of the fabric. If the proportion of the resin component is too small, the strength may be insufficient and the adhesion to the protective layer may be lowered, and if it is too large, the flexibility required for the belt may be lowered.

The core body may be formed of a single cloth, or may be a laminated body of a plurality of cloths. The number of fabrics in the laminate is not particularly limited, and is 2 or more (for example, 2 to 10), preferably 2 to 5 (particularly 2 to 4), more preferably 2 to 3, and most preferably 2. When the core body contains a plurality of fabrics, it may contain a fabric that does not contain a resin component, but it is preferable that all the fabrics contain a resin component from the viewpoint of improving the interlayer adhesion.

When forming a laminate with a plurality of fabrics, an intermediate layer may be interposed between the fabrics. The intermediate layer is not particularly limited as long as the fabrics can be bonded to each other, and a conventional adhesive or adhesive can be used. However, from the viewpoint of improving the adhesion between the cores, it is the same as the resin component impregnated in the cores or It is preferable to use the same type of resin (particularly the same resin), and it is particularly preferable to use the same or the same type of resin (particularly the same resin) as the resin component contained in the protective layer. That is, the resin component of the intermediate layer is preferably an elastomer type that is not used in combination with a curing agent, like the transparent non-adhesive layer.

The average thickness of the intermediate layers (the average thickness of each intermediate layer when a plurality of intermediate layers are combined) is, for example, 0.05 to 1 mm, preferably 0.1 to 0.5 mm, and more preferably 0.2 to 0.4 mm. Degree.

In the core body, the number of laminated fabrics (number of plies) can be appropriately selected according to the mechanical strength and flexibility required for the target belt, but about 1 to 5 plies are generally used, and 1 to 3 plies are used. Is preferable, and 1 to 2 plies are more preferable.

(Cover layer)
In the transport belt of the present invention, a cover 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, it is preferable to use the same or the same type of resin (particularly the same resin) as the resin component impregnated in the core body from the viewpoint of improving the adhesion to the core body, and the protective layer contains the resin component. Resins of the same or the same type as the resin components (particularly the same resin) are particularly preferable. That is, the resin component of the cover layer is preferably an elastomer type that is not used in combination with a curing agent, like the transparent non-adhesive layer.

The average thickness of the cover layer is, for example, 0.03 to 3 mm, preferably 0.05 to 1 mm, more preferably 0.1 to 0.5 mm, more preferably 0.15 to 0.3 mm, and most preferably 0.17. It is ~ 0.25 mm.

[Manufacturing method of conveyor belt]
The transport belt of the present invention may be a method obtained by a manufacturing method including a transparent non-adhesive layer forming step of laminating a transparent non-adhesive layer precursor on the transport surface side of the core precursor, and a conventional method is used. However, from the viewpoint of productivity and the like, a protective layer forming step of laminating the protective layer precursor on the transport surface of the core precursor, and laminating the mark layer precursor on at least a part of the surface of the protective layer precursor. The mark layer forming step, the transparent non-adhesive layer forming step of laminating a transparent non-adhesive layer precursor on a protective layer precursor in which a mark layer precursor is laminated in at least a part of a region to obtain a transport belt precursor, described above. A method of hot-pressing the transport belt precursor to integrate them is preferable.

As a method for preparing the core precursor used in the protective layer forming step, a conventional method can be used, for example, a method of impregnating a liquid composition containing a resin component and a curing agent with a cloth (Japanese Patent Laid-Open No. 11-29212). (The method described in the publication, etc.) and the like. Examples of the solvent of the liquid composition include hydrocarbons (for example, alicyclic hydrocarbons such as cyclohexane, aromatic hydrocarbons such as toluene and xylene), halogenated hydrocarbons (chloroform, dichloromethane and the like), and the like. Ethers (chain ethers such as diethyl ether, cyclic ethers such as dioxane and tetrahydrofuran), ketones (acetone, methyl ethyl ketone, etc.), esters (methyl acetate, ethyl acetate, etc.), amides (eg, formamide, N, N) − Dimethylformamide and the like), nitriles (eg, acetonitrile and the like), sulfoxides (eg, dimethyl sulfoxide and the like) and the like. These organic solvents can be used alone or as a mixed solvent. Among these solvents, hydrocarbons and ketones are widely used. The concentration of the resin component in the liquid composition is, for example, 5 to 50% by mass, preferably 10 to 30% by mass, and more preferably 15 to 20% by mass.

After the immersion, it may be heated and dried. The heating temperature is, for example, 60 to 200 ° C., preferably 80 to 160 ° C., and more preferably 100 to 140 ° C. The heating time may be, for example, 1 minute or more, for example, 1 to 30 minutes, preferably 3 to 10 minutes.

Further, when a plurality of fabrics are laminated as the core, a laminate of the fabric impregnated with the liquid composition and the sheet-like intermediate layer precursor may be used as the core precursor.

The method of laminating the protective layer precursor can be selected according to the type of the protective layer, and a coating method of applying the protective layer precursor to the transport surface of the core precursor may be used, but from the viewpoint of productivity and the like, the sheet-like precursor is used. A method of laminating the body on the transport surface of the core precursor is preferable.

In the mark layer forming step, the method of laminating the mark layer precursor may be a method of printing a liquid composition containing an ink composition for forming the mark layer.

The liquid composition may further contain a solvent in addition to the ink composition. The solvent can be appropriately selected according to the type of the colorant and the binder resin, and in addition to the solvent for impregnating the core precursor with the resin component and the curing agent, water, alcohols (ethanol, isopropanol, etc.) and the like can be used. Available. The solvent can be used alone or in combination of two or more. In the liquid ink composition, the ratio of the solvent is, for example, 0.01 to 100 parts by mass, preferably 0.1 to 50 parts by mass, and more preferably 1 to 30 parts by mass with respect to 1 part by mass of the colorant. ..

As a printing method, a conventional printing method can be used. Examples of the printing method include a screen printing method, an inkjet printing method, an intaglio printing method (for example, a gravure printing method), an offset printing method, an intaglio offset printing method, and a flexo printing method. Of these methods, the inkjet printing method is preferable.

In the transparent non-adhesive layer forming step, the method of laminating the transparent non-adhesive layer precursor can be selected according to the type of the transparent non-adhesive layer, and the protective layer precursor in which the mark layer precursor is laminated in at least a part of the region can be selected. A coating method may be applied on the body, but from the viewpoint of productivity and the like, a method in which the sheet-like transparent non-adhesive layer precursor is laminated on the protective layer precursor is preferable.

In the hot pressing step, the heating temperature can be selected according to the type of resin component, but may be, for example, 100 ° C. or higher, preferably 100 to 200 ° C., and more preferably 120 to 180 ° C. The applied pressure is, for example, 0.1 MPa or more, preferably 0.1 to 0.6 MPa, and more preferably 0.2 to 0.5 MPa. The hot pressing time may be, for example, 10 seconds or more, for example, 1 to 20 minutes, preferably about 3 to 10 minutes.

The heat pressing process is not limited to the process of collectively heat pressing the transport belt precursors, and may be divided into a plurality of times and heat pressed. For example, each time each layer precursor is laminated, heat is generated. You may press.

When the transport belt of the present invention has a cover layer, a cover layer forming step of laminating the cover layer precursor on the inner peripheral surface of the core precursor may be further included as a pre-step of the hot pressing step. The method of laminating the cover layer precursor can also be selected according to the type of the cover layer, and may be a coating method of applying to the inner peripheral surface of the core precursor, but from the viewpoint of productivity and the like, it is in the form of a sheet. A method of laminating the precursor on the inner peripheral surface of the core precursor is preferable.

In the transport belt of the present invention, a conventional method can be used as a method for forming a plurality of convex portions (concavo-convex structure) in the vertical and horizontal directions on the surface of the transparent non-adhesive layer, but from the viewpoint of simplicity and the like, it is in a molten state. A method of laminating and solidifying a release sheet having a mold having a desired uneven structure and an inverted mold on a transparent non-adhesive layer and then peeling off the release sheet. In the heat pressing step, the target mold is used. A method having an uneven structure and an inverted mold is preferable. When the release sheet is used, the heating temperature can be selected as a condition for melting the transparent non-adhesive layer according to the type of the silicone-modified resin contained in the transparent non-adhesive layer, but in the case of silicone-modified polyurethane, for example, 100 ° C. It may be the above, preferably 100 to 170 ° C., and more preferably 120 to 160 ° C. At the time of heating, pressure may be applied, and the pressure is, for example, 0.1 MPa or more, preferably 0.1 to 0.6 MPa, and more preferably 0.2 to 0.5 MPa. The heating time may be, for example, 10 seconds or more, for example, 1 to 20 minutes, preferably about 3 to 10 minutes.

The form of the obtained transport belt is not particularly limited and may be a belt having no joint (seamless belt), but is usually an endless belt that joins both ends. FIG. 2 is a side view of the transport belt of the present invention prepared in an endless shape and mounted on a pulley. As shown in FIG. 2, the obtained transport belt 10 is used by being wound between the drive pulley 11 and the driven pulley 12 after being prepared into an endless belt by joining both ends. Specifically, a transported object such as food is placed on the transport belt 10 mounted on the pulley, and can be transported from the driven pulley 12 side to the drive pulley 11 side.

The method of joining both ends of the obtained transport belt is not particularly limited, but usually, in order to firmly fix the joint, both ends are formed in a non-linear shape such as a zigzag shape (lightning shape), and the joint is further formed. A method of covering with a reinforcing member is used.

FIG. 3 is a plan view of a joint portion of the transport belt of the present invention prepared in an endless shape. As shown in FIG. 3, first, the obtained transport belt is cut at both ends in the longitudinal direction in a zigzag shape (lightning shape), and the cut ends are abutted against each other. Next, as shown in FIG. 3, a reinforcing member 10a [for example, a sheet of the same material as the transparent non-adhesive layer (for example, silicone-modified polyurethane), a woven cloth, etc.] is placed on the joint portion in which both ends are joined. They are laminated and joined by pressurizing the joint portion of the transport belt together with the reinforcing member using a hot plate press machine. A mark layer 10b is formed on the transport 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 materials used]
(Sheet-like precursor for forming a transparent non-adhesive layer or a transparent surface layer, a protective layer, an intermediate layer, and a cover layer)
Silicone-modified elastomer A: Silicone-modified polycarbonate type thermoplastic urethane elastomer ["Resamine PS" manufactured by Dainichiseika Kogyo Co., Ltd., silicone content 8% by mass]
Silicone-modified elastomer B: Silicone-modified polycarbonate type thermoplastic urethane elastomer ["Resamine PS" manufactured by Dainichiseika Kogyo Co., Ltd., silicone content 16% by mass]
Silicone-modified elastomer C: Silicone-modified polyether type thermoplastic urethane elastomer ["Resamine PS" manufactured by Dainichi Seika Kogyo Co., Ltd., silicone content 8% by mass]
Silicone-modified elastomer D: Silicone-modified polyether type thermoplastic urethane elastomer ["Resamine PS" manufactured by Dainichi Seika Kogyo Co., Ltd., silicone content 16% by mass]
Urethane Elastomer A: Polyether Type Thermoplastic Polyurethane Elastomer [Unmodified Silicone, "Milactran E385" manufactured by Nippon Miractran Co., Ltd.]
Urethane elastomer B: Polycarbonate type thermoplastic polyurethane elastomer [Silicone unmodified product, "Milactran XN-2001" manufactured by Nippon Miractran Co., Ltd.].

(Material for forming the core)
Plain weave cloth A [War yarn: Polyester spun yarn (thickness 20 count, number of twisted yarns 2, yarn density: 140 yarns / 5 cm)], [Weft yarn: Polyester monofilament (fineness 1100 dtex, number of twisted yarns 1, yarn density: 56 yarns) / 5cm)], thickness 0.6mm
Plain weave cloth B [War yarn: Polyester spun yarn (thickness 20 count, number of twisted yarns 2, yarn density: 78 yarns / 5 cm)], [Weft yarn: Polyester monofilament (fineness 660 dtex, number of twisted yarns 1, yarn density: 68 yarns) / 5cm)], thickness 0.5mm
Resin component: Polyether type thermoplastic polyurethane resin (reactant of polytetramethylene ether glycol and MDI)
Solvent: A mixed solvent of methyl ethyl ketone, cyclohexane and tetrahydrofuran (methyl ethyl ketone / cyclohexane / THF = 15/45/40 (mass ratio))
Hardener: Polyisocyanate composition.

(Removable paper)
Lattice-like uneven pattern (the shape of the non-adhesive layer after transfer is an uneven pattern in which one side of a square is about 0.38 mm, the distance between adjacent convex portions is about 0.44 mm, and the height of the convex portions is about 0.1 mm). Paper pattern with.

[Evaluation of non-adhesiveness (peeling force) of the transport surface]
The transport belts obtained in Examples and Comparative Examples are cut to predetermined dimensions (width 190 mm, length 280 mm) to form test pieces, and the length of the test is placed on a horizontally movable table (rectangular table). Fix the vertical direction parallel to the length direction of the table. Next, a cellophane tape (width 15 mm, length 300 mm) is placed in the center of the surface (conveyed surface) of the test piece so that the length direction of the cellophane tape is parallel to the length direction of the table and the test piece. Press with a roller to attach. Further, the load cell is fixed on one side in the length direction of the table, and one end of the cellophane tape on the side opposite to the side where the load cell is fixed and the tip of the string fastened to the load cell are gripped and fixed with a clip. .. The table is moved in the length direction at 300 mm / min toward the direction away from the load cell, the cellophane tape is peeled off from the surface of the test piece in the 180 degree direction, and the peeling force is measured. The peeling force was an average value excluding the peak value at the initial stage of peeling. As a criterion (reference value) for determining non-adhesiveness (peeling force), 10 gf / mm or less is a passing level.

[Non-adhesive evaluation after running]
As shown in FIG. 11, the transport belts (width 100 mm × length 1450 mm, endless) obtained in Examples 2 and 8 to 14 were used in a multi-axis layout testing machine in which four pulleys having a diameter of 100 mm or 25 mm were arranged. Method: Lightning type) is suspended at a belt tension of 2.6 kgf / cm, and the transport surface (transparent non-adhesive layer) is pressed by a scraper 15 (2.6 kgf / width 100 mm), and the number of bends is 30 m / min at a belt speed. The belt was run until the number of times reached 600,000 times, and the peeling force was measured on the belt transport surface after the running.

[Adhesive strength to mark layer]
The adhesive force between the upper layer of the mark layer and the lower layer of the mark layer (adhesive force between the upper and lower layers sandwiching the mark layer) was measured according to JIS K 6256.

[Visibility (correct answer rate)]
On each of the transport belts obtained in Examples and Comparative Examples, a mark layer was formed by printing a mark (character "A") on the surface of the protective layer on the transport surface side with an inkjet printer. As shown in FIG. 4, the size of the mark (character of "A") was set to 30 mm, 20 mm, 10 mm, 5 mm, and 3 mm (mark size indicated by □ in the figure) in the vertical and horizontal directions of the character. In addition, as for the color of the mark (the letter "A"), four types of red, blue, black, and yellow were formed for each size. Then, each of the produced transport belts was cut to a predetermined size (210 × 297 mm) to produce a total of 20 types of test pieces.

In the sensory test of mark visibility, as shown in FIG. 5, test pieces 13 with 20 types of marks were placed on a table 14 having a height of 600 mm, and 6 observers were separated from the table 14 by about 1 m. Visually check the mark at the position, and if the mark (character) can be read (identified), it is judged by "○", and if the mark (character) cannot be read (identified), it is judged by "x". Then, for each observer, it was determined and recorded whether or not the mark (character) of each embodiment could be read. Regarding the results of the sensory test of mark visibility, the results of totaling the number of "○" for each mark size and color of each example and the correct answer rate are summarized.

[Visibility (reading QR code (registered trademark))]
In addition to the transport belts manufactured for evaluating the visibility (correct answer rate), each of the transport belts obtained in Examples 2 and 9 to 15 has a QR code on the surface of the protective layer on the transport surface side with an inkjet printer. A conveyor belt having a mark layer printed with (10 mm × 10 mm) was also manufactured. Cut each of the manufactured transport belts to a predetermined size (100 mm x 100 mm), and use the QR code scanner (Denso Wave's "Kurukuru-QR code reader") of the smartphone app to check the readability of the QR code as follows. Evaluated by criteria.

〇: QR code can be read instantly △: Can be read but takes time ×: Cannot be read.

Example 1
The plain weave cloth A is immersed in a liquid composition containing a resin component, a curing agent, and a solvent for 0.5 minutes to be taken out, and then heated at 120 ° C. for 5 minutes to dry to remove the solvent. A precursor was obtained.

A mark layer described in the method for evaluating visibility was formed on one surface of urethane elastomer A as a protective layer precursor using an inkjet printer.

A urethane elastomer A having a mark layer formed by contacting a surface on which a mark layer is not formed with the core precursor is laminated on the core precursor, and a transparent non-adhesive layer is further formed on the urethane elastomer A. The silicone-modified elastomer A as a precursor was laminated and heat-pressed at 150 ° C. and 0.3 MPa for 5 minutes using a press machine to melt the laminate, and then cooled and solidified (heat pressing step). The transport belt shown in FIG. 1 was obtained.

The release paper is laminated on the transparent non-adhesive layer formed of the silicone-modified elastomer A of the obtained transport belt, and heat-pressed at 150 ° C. and 0.3 MPa for 5 minutes using a press machine to obtain the transparent non-adhesive layer. Was melted, then cooled and solidified. Further, the paper pattern was peeled off from the transparent non-adhesive layer to form an uneven structure on the surface of the transparent non-adhesive layer.

Example 2
The plain weave cloth B is immersed in a liquid composition containing a resin component, a curing agent, and a solvent for 0.5 minutes to be taken out, and then heated at 120 ° C. for 5 minutes to be dried to remove the solvent. A fabric was produced and a second fabric was obtained in a similar manner. A laminate in which urethane elastomer A as an intermediate layer precursor is interposed between the first cloth and the second cloth is used as a core precursor, and is subjected to a hot pressing step in the same manner as in Example 1. , As shown in FIG. 6, a core body in which an intermediate layer 1c is interposed between the first cloth layer 1a and the second cloth layer 1b, and a protective layer 2 laminated on the transport surface side of the core body. The mark layer 3 laminated on a part of the surface of the protective layer 2 and the transparent non-adhesive layer 4 laminated on the protective layer 2 on which the mark layer 3 is laminated on a part of the area. The formed transport belt was obtained. An uneven structure was formed on the surface of the transparent non-adhesive layer 4 of the obtained transport belt in the same manner as in Example 1.

Example 3
A transport belt was manufactured in the same manner as in Example 2 except that urethane elastomer B was used instead of urethane elastomer A as the protective layer precursor and the intermediate layer precursor.

Example 4
The urethane elastomer A was laminated as the cover layer precursor on the inner peripheral surface side of the core precursor, and subjected to the heat pressing step in the same manner as in Example 1. As shown in FIG. 7, the cover layer 5 and the cover layer 5 and the same. A core body 1 laminated on the transport surface side of the cover layer 5, a protective layer 2 laminated on the transport surface side of the core body 1, and a mark layer laminated on a part of the surface of the protective layer 2. A transport belt formed of 3 and a transparent non-adhesive layer 4 laminated on the protective layer 2 in which the mark layer 3 was laminated in a part of the region was obtained. An uneven structure was formed on the surface of the transparent non-adhesive layer 4 of the obtained transport belt in the same manner as in Example 1.

Example 5
The urethane elastomer A was laminated as the cover layer precursor on the inner peripheral surface side of the core precursor, and subjected to the heat pressing step in the same manner as in Example 2, and as shown in FIG. 8, the first fabric layer 1a A core body in which an intermediate layer 1c is interposed between the second cloth layer 1b, a cover layer 5 laminated on the inner peripheral surface side of the core body, and a protective layer laminated on the transport surface side of the core body. 2, a mark layer 3 laminated on a part of the surface of the protective layer 2, and a transparent non-adhesive layer laminated on the protective layer 2 on which the mark layer 3 is laminated on a part of the area. A transport belt formed by 4 was obtained. An uneven structure was formed on the surface of the transparent non-adhesive layer 4 of the obtained transport belt in the same manner as in Example 1.

Comparative Example 1
The plain weave cloth B is immersed in a liquid composition containing a resin component, a curing agent, and a solvent for 0.5 minutes to be taken out, and then heated at 120 ° C. for 5 minutes to be dried to remove the solvent. A fabric was produced and a second fabric was obtained in a similar manner. Urethane elastomer A as an intermediate layer precursor was interposed between the first cloth and the second cloth to obtain a laminated body as a core precursor.

A mark layer described in the method for evaluating visibility was formed on one surface of urethane elastomer A as a protective layer precursor using an inkjet printer.

A urethane elastomer A having a mark layer formed by contacting a surface on which a mark layer is not formed with the core precursor is laminated on the core precursor, and a transparent surface layer is further laminated on the urethane elastomer A. Urethane elastomer A as a precursor was laminated and heat-pressed at 150 ° C. and 0.3 MPa for 5 minutes using a press machine to melt the laminate, then cooled and solidified (heat pressing step). The transport belt shown in 9 was obtained. That is, the core body in which the intermediate layer 1c is interposed between the first cloth layer 1a and the second cloth layer 1b, the protective layer 2 laminated on the transport surface side of the core body, and the surface of the protective layer 2. A transport belt formed by a mark layer 3 laminated in a part of the region and a transparent surface layer 6 laminated on the protective layer 2 in which the mark layer 3 was laminated in a part of the region was obtained. ..

Comparative Example 2
An uneven structure was formed on the surface of the transparent surface layer 6 of the transport belt obtained in Comparative Example 1 in the same manner as in Example 1.

Comparative Example 3
A transport belt was manufactured in the same manner as in Example 2 except that an uneven structure was not formed on the surface of the transparent non-adhesive layer 4.

Comparative Example 4
The plain weave cloth B is immersed in a liquid composition containing a resin component, a curing agent, and a solvent for 0.5 minutes to be taken out, and then heated at 120 ° C. for 5 minutes to be dried to remove the solvent. A second fabric was obtained in the same manner.

A mark layer described in the visibility evaluation method was formed on one surface of the urethane elastomer A as the second intermediate layer precursor using an inkjet printer.

On the second cloth, the urethane elastomer A having the mark layer formed by bringing the surface on which the mark layer was not formed into contact with the second cloth was laminated. Further, the urethane elastomer A as the first intermediate layer precursor and the first cloth are sequentially laminated on the urethane elastomer A, and heat-pressed at 150 ° C. and 0.3 MPa for 5 minutes using a press machine. After melting the laminate, it was cooled and solidified (heat pressing step) to obtain a transport belt shown in FIG. That is, the second cloth layer 1b, the second intermediate layer 1e laminated on the transport surface side of the second cloth layer 1b, and a part of the surface of the second intermediate layer 1e are laminated. On the mark layer 3 and the first intermediate layer 1d laminated on the second intermediate layer 1e on which the mark layer 3 is laminated in a part of the region, and on the first intermediate layer 1d. A transport belt formed of the laminated first fabric layer 1a was obtained.

Comparative Example 5
A transport belt was produced in the same manner as in Comparative Example 2 except that urethane elastomer B was used instead of urethane elastomer A as the transparent surface layer precursor.

Example 6
A transport belt was produced in the same manner as in Example 2 except that a silicone-modified elastomer B was used instead of the silicone-modified elastomer A as the transparent non-adhesive layer precursor.

Example 7
A transport belt was produced in the same manner as in Example 2 except that the silicone-modified elastomer C was used instead of the silicone-modified elastomer A as the transparent non-adhesive layer precursor.

Example 8
A transport belt was produced in the same manner as in Example 2 except that the silicone-modified elastomer D was used instead of the silicone-modified elastomer A as the transparent non-adhesive layer precursor.

Examples 9 to 15
A transport belt was manufactured in the same manner as in Example 2 except that the thickness of the transparent non-adhesive layer was changed.

In the transport belts obtained in Examples 1 to 5 and Comparative Examples 1 to 4, the laminated structure formed on the core body and the thickness of each layer are shown in Table 1, and the details of the core body and the evaluation result of the transport belt are shown. It is shown in Table 2. In the transport belts obtained in Examples 6 to 8 and Comparative Example 5, the evaluation results of the transport belts are shown in Table 3 together with the results of Examples 2 and 2. Further, also in the transport belts obtained in Examples 9 to 15, the evaluation results of the transport belts are shown in Table 4 together with the results of Example 2. In Table 4, the QR code reading test was evaluated as the visibility, and the non-adhesiveness after running was also evaluated. In addition, detailed visibility results are shown in Tables 5-7 for all Examples and Comparative Examples.

As is clear from the results in Tables 2 and 5, the transport belts obtained in Examples 1 to 5 in which the transparent non-adhesive layer was formed of a silicone-modified elastomer had a high surface non-adhesiveness and was resistant to the mark layer. In addition to high adhesion, it also has excellent visibility. On the other hand, the transport belts obtained in Comparative Examples 1 and 2 in which the transparent surface layer was formed of urethane elastomer and the transport belts obtained in Comparative Example 3 in which the surface pattern was not formed had non-adhesive surfaces. Was low. Further, the transport belt obtained in Comparative Example 4 in which the transparent non-adhesive layer was not formed and the mark layer was formed between the first intermediate layer and the second intermediate layer had low visibility. ..

Further, as is clear from the results in Tables 3 and 5-6, the transport belts in which the silicone content of the silicone urethane elastomer forming the transparent non-adhesive layer was changed had excellent visibility, but the silicone content was high. As it became lower, the non-adhesiveness decreased and the adhesiveness improved. In the transport belts of Comparative Examples 2 and 5 having a silicone content of 0% by mass, the non-adhesiveness exceeded the acceptance standard of 10 gf / mm and was rejected. Further, considering the balance between non-adhesiveness and adhesiveness, when the silicone content was 16% by mass, the adhesive strength was slightly insufficient, so 8% by mass was the most excellent. Further, regarding the structure of the urethane elastomer in the silicone urethane elastomer forming the transparent non-adhesive layer, the polycarbonate type was slightly superior to the polyether type in terms of adhesive strength. That is, the transport belt of Example 2 in which the transparent non-adhesive layer was formed of the polycarbonate-type silicone-modified elastomer having a silicone content of 8% by mass was the most excellent in balance.

Further, as is clear from the results in Tables 4 and 7, the transport belts obtained in Examples 2 and 10 to 11 having a transparent non-adhesive layer having a thickness of 0.1 to 0.3 mm have good visibility (more visible). The correct answer rate was 80% or more), but the transport belts obtained in Examples 12 to 13 having a thickness of 0.4 to 0.6 mm had reduced visibility (correct answer rate of less than 80%) and had a thickness of 0.8 to 0.8. In the transport belts obtained in Examples 14 to 15 of 1.0 mm, the visibility was further lowered (correct answer rate was less than 60%, QR code could not be read). In addition, when a surface pattern (concavo-convex structure) is provided, a tendency for interference patterns (moire) to occur can be observed, and the larger the thickness of the transparent non-adhesive layer, the greater the influence of the interference pattern (moire) due to the surface pattern. The resolution of prints and markings has decreased (images are blurred). In particular, since fine figures and characters are difficult to see, there is a risk that problems such as tired eyes of the operator may occur in actual use.

On the other hand, the transport belt obtained in Example 9 having a thin transparent non-adhesive layer of 0.05 mm had good visibility, but the transparent non-adhesive layer on the transport surface was worn by the running test, and the transparent non-adhesive layer was worn. Non-adhesive persistence was low.

Summarizing the results in Tables 4 and 7, the appropriate range of the transparent non-adhesive layer thickness X (mm) can be ranked as follows (A rank is the best and C rank is the worst).

0.1 ≤ X ≤ 0.3: A rank (best mode)
0.3 <X <0.8: B rank 0.8 ≤ X ≤ 1.0: C rank

Since the required level of "visibility" differs depending on the use of the transport belt, the purpose of the mark, and the like, the pass / fail of the rank changes depending on the required level. For example, if the mark is a QR code and it is used to be read by a reader, the C rank is practically unacceptable. On the other hand, if the mark is a large character or figure and it is only necessary to be able to see it, it can be practically used even in C rank, and the transport belt of the present invention is selected and used according to the application. it can.

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 has excellent releasability. Therefore, highly sticky articles (for example, foods such as bread dough and confectionery dough). ) Is suitable as a transport belt.

1 ... Core body 1a ... 1st cloth layer 1b ... 2nd cloth layer 1c ... Intermediate layer 2 ... Protective layer 3 ... Mark layer 4 ... Transparent non-adhesive layer 5 ... Cover layer

Claims (11)

A core body, a protective layer laminated on the transport surface of the core body and containing a resin component, a mark layer for transmitting information laminated on at least a part of the surface of the protective layer, and this mark layer. A transport belt comprising a transparent non-adhesive layer containing a silicone-modified resin containing an organosiloxane unit, and having a plurality of protrusions formed in the vertical and horizontal directions of the surface, which is laminated on the protective layer in which the above-mentioned material is laminated .
A conveyor belt in which the mark layer is formed of an ink composition in a part of a region of the protective layer . The transport belt according to claim 1, wherein the silicone-modified resin is a thermoplastic resin or a thermoplastic elastomer. The transport 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 transport belt according to any one of claims 1 to 3, wherein the silicone-modified resin is a silicone-modified polyurethane. The transport belt according to claim 4, wherein the silicone-modified polyurethane is a polyether-type polyurethane or a polycarbonate-type polyurethane silicone-modified resin. The transport belt according to any one of claims 1 to 5, wherein the silicone-modified resin is a polycarbonate-type polyurethane containing 3 to 15% by mass of an organosiloxane unit. The transport belt according to any one of claims 1 to 6, wherein the resin component of the protective layer is a resin of the same type as the base resin of the silicone-modified resin. The transport belt according to any one of claims 1 to 7, wherein the core body contains a cloth and a resin component, and the resin component is a resin of the same type as the base resin of a silicone-modified resin. The transport belt according to any one of claims 1 to 8 , wherein the transparent non-adhesive layer has an average thickness of 0.1 to 0.6 mm. A core body, a protective layer laminated on the transport surface of the core body and containing a resin component, a mark layer for transmitting information laminated on at least a part of the surface of the protective layer, and this mark layer. A method for manufacturing a transport belt, which comprises a transparent non-adhesive layer containing a silicone-modified resin containing an organosiloxane unit, and having a plurality of protrusions formed in the vertical and horizontal directions of the surface, which is laminated on the protective layer in which There,
A protective layer forming step of laminating a protective layer precursor on the transport surface of the core precursor, a mark layer forming step of laminating a mark layer precursor on at least a part of the surface of the protective layer precursor, and the mark layer precursor. A transparent non-adhesive layer forming step of laminating a transparent non-adhesive layer precursor on a protective layer precursor laminated with the above to obtain a transport belt precursor, and a heat pressing step of hot-pressing the transport belt precursor to integrate them. Manufacturing method including . The manufacturing method according to claim 10 , wherein in the hot pressing step, a convex portion is formed on the surface of the transparent non-adhesive layer after hot pressing or by using a mold together with hot pressing.

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