JP7057763B2 - screen - Google Patents

Description

The present invention relates to a screen for sieving lumps and powders such as ores, crushed stones, coke, and chemicals.

Masses and powders such as ore, crushed stone, coke, and chemicals are screened using a screen (net) to make the particle size uniform. More specifically, sieving is performed by placing a lump or a powder or granular substance, which is an object to be screened (sorted object), on the upper surface of the screen and dropping it downward from the opening of the screen. Conventionally, a metal screen has been used as such a screen. However, in recent years, screens made of elastic material (rubber screens) have become the mainstream instead of metal screens because of their excellent life, noise problems, wear resistance, and ease of attachment to vibration screens. There is.

For example, Japanese Patent Publication No. 2-108779 (Patent Document 1) describes ropes having various cross-sectional shapes in which twisted yarns such as steel cords and chemical fibers are used as tensioning bodies and the periphery thereof is covered with a rubber-like elastic body such as polyurethane. The upper layer is parallel to the traveling direction of the object to be sorted, the lower layer is perpendicular to the traveling direction of the object to be sorted, and two types of ropes having different thicknesses in the upper and lower layers are interlaced and laminated at a predetermined pitch. Of all the cross-sections, the cross-section of the small-diameter rope is in a non-contact state, and the remaining cross-sections are weld-bonded to disclose a rubber screen for a vibrating sieve.

Further, in Japanese Patent Application Laid-Open No. 8-89896 (Patent Document 2), a cored rope in which a twisted yarn such as a steel cord or a chemical fiber is used as a tensioning body and the circumference thereof is coated with an elastic body such as polyurethane or rubber is laterally provided. A rubber screen for a two-layer structure vibrating sieve including a screen made of an elastic net in which cored or uncore ropes are aligned in parallel and laminated and interlaced with cored or uncore ropes perpendicular to each other in the vertical direction. It has been disclosed.

Further, in Japanese Patent Application Laid-Open No. 11-114498 (Patent Document 3), a urethane weft (weft rope) having a core wire made of a piano wire or a para-based total aromatic polyamide fiber is formed, and a longitudinal protrusion is formed at the lower portion. An improved net for a vibrating sieve is disclosed in which the urethane warp (warp rope) is crossed and the ridge is integrally welded to the upper part of the weft at the crossing.

Like the screens of Patent Documents 1 to 3, the screen is usually installed in a vibrating sieve and used in a vibrating state, but in order to efficiently perform the screening with the vibrating sieve, the opening is clogged. It becomes an issue. In particular, when the object to be sorted contains water or is in a state of high viscosity, the object to be sorted easily adheres to the screen surface (the surface of the elastic material) and accumulates, and clogging is likely to occur. However, with these screens, clogging cannot be sufficiently suppressed for the object to be sorted, which tends to adhere.

On the other hand, when sieving hard and angular objects such as ore, crushed stone, and coke, wear of the upper part of the rope (stripe formed of elastic body) constituting the screen is also an issue, and in particular, elasticity. In the case of a rope having a tension body inside the body, the tension body is exposed as the elastic material wears.

In order to suppress the wear of the elastic body of the rope, Japanese Patent Application Laid-Open No. 51-113250 (Patent Document 4) describes a rope in which the tension body is covered with wear-resistant rubber in two layers in the vertical and horizontal directions. In a rubber screen that is laminated and the crossed parts are joined and integrated, it is in a rope having a circular, elliptical, semicircular, semi-elliptical, polygonal shape such as a square or trapezoidal shape, and a cross-sectional shape combining an arc and a string. A rubber screen having an improved life is disclosed by unevenly distributing the position of the tension body downward to increase the thickness of the worn portion.

Further, in Japanese Patent Application Laid-Open No. 11-309414 (Patent Document 5), a warp and weft intersection of a polyurethane rope in which a core wire (tensile body) is embedded is welded, and the upper surface of the rope is flat and both side surfaces are substantially orthogonal to the upper surface. However, the lower surface is formed in a substantially arc shape, the height from the upper surface to the core wire is larger than the height from the lower surface to the core wire, and the height h from the upper surface to the center of the lower surface is from the width w between both side surfaces. A large netscreen network is disclosed.

In the ropes of Patent Documents 4 and 5, a tension body forming a core portion (core wire) of the rope is embedded below the center of the rope (downstream side through which the object to be sorted passes). That is, the ropes of Patent Documents 4 and 5 have a circular cross-section, and the elastic body at the upper part of the tension body is thicker than the conventional rope in which the tension body is embedded in the center of the circle. have. Therefore, as compared with the conventional ropes, the ropes of Patent Documents 4 and 5 have a longer life due to wear because the tension body is less likely to be exposed even if the elastic body is worn from above by the object to be sorted.

However, among the ropes of Patent Documents 4 and 5, the rope having a larger diameter in the screen thickness direction than the conventional rope improves the wear resistance, but has more chances of contact with the object to be sorted. Clogs are likely to occur. In particular, while a conventional rope having a circular cross section easily makes point contact with an object to be sorted, in a rope having a planar shape in the screen thickness direction (a rope having a side surface having a planar shape), the planar shape is the object to be sorted. Surface contact is easy, the contact area between the object to be sorted and the side surface of the rope is large, and clogging is likely to occur.

Jikkenhei 2-108779 (Claim 1 of the Claims for Utility Model Registration) JP-A-8-89896 (Claim 1) JP-A-11-114998 (Claim 1, paragraph [0013] [0014]) Japanese Patent Application Laid-Open No. 51-113250 (Claims, pages 9 to 20, Fig. 4) JP-A-11-309414 (Claims)

Therefore, an object of the present invention is to provide a screen capable of suppressing clogging and efficiently sieving even an object to be sorted that is easily adhered.

Another object of the present invention is to provide a screen having excellent durability and suppressing clogging.

As a result of diligent studies to achieve the above problems, the present inventors have included a silicone-modified resin containing an organosiloxane unit in the elastic material forming the rope of the screen, so that even an object to be easily adhered to the material to be sorted can be easily adhered. We have found that clogging can be suppressed and screening can be performed efficiently, and the present invention has been completed.

That is, the screen of the present invention has a first rope, which is a plurality of lines arranged in parallel in the first direction at intervals, and a second rope that intersects the first rope in the first direction. A screen formed of a second rope, which is a plurality of strips that are arranged (or laminated) at intervals parallel to each other and have cross-contact portions with the first rope joined. The first rope is a first body portion made of a first elastic material, and a first tension body embedded in the first body portion and extending in the length direction to form a core wire. The second rope is formed of a second body portion made of a second elastic material, and a second tension body embedded in the second body portion and extending in the length direction to form a core wire. The first elastic material and / or the second elastic material contains 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 may be about 5 to 20% by mass with respect to the entire silicone-modified resin. The silicone-modified resin may be a silicone-modified polyurethane. The silicone-modified polyurethane may be a polyether-type polyurethane or a polycarbonate-type polyurethane silicone-modified resin. The silicone-modified resin may be a polycarbonate-type polyurethane containing 3 to 15% by mass of an organosiloxane unit. The first rope and / or the second rope may have a flat surface portion extending in the length direction. The first tension body and the second tension body may be a fiber cord or a metal cord. The second direction may be a direction orthogonal to the first direction. The screen may be a screen installed in a vibrating sieve.

In the present specification and claims, the screen means a net for sieving the object to be sorted, and the rope means a striatum constituting the screen.

In the present invention, since the elastic material forming the rope of the screen contains a silicone-modified resin containing an organosiloxane unit, clogging can be suppressed even if the object to be sorted is easy to adhere to, and the object to be sorted can be efficiently selected. Can be screened. Further, even a screen formed of a rope having a flat portion extending in the length direction can suppress clogging, so that not only clogging can be suppressed but also the durability of the screen can be improved.

FIG. 1 is a schematic partial perspective view showing an example of the screen of the present invention. FIG. 2 is a cross-sectional view showing an example of a rope constituting the screen of the present invention. FIG. 3 is a schematic diagram for explaining a method of evaluating the joint strength of the crossing rope in the embodiment. FIG. 4 is a schematic diagram for explaining a method of evaluating clogging in an embodiment. FIG. 5 is a schematic diagram for explaining an evaluation method in the vibrating sieve (actual machine) of the embodiment.

[screen]
The structure of the screen of the present invention is similar to that of a conventional screen used for various purposes. FIG. 1 is a schematic partial perspective view showing an example of the screen of the present invention, in which the screen 3 is a first rope (a first rope) which is a plurality of lines arranged in parallel in a first direction (horizontal direction) at equal intervals. The horizontal rope) 1 and the first rope 1 are arranged (or laminated) in parallel with the second direction (longitudinal direction) orthogonal to the first direction at equal intervals, and the first rope is arranged. It is formed of a second rope (vertical rope) 2 which is a plurality of strips to which the crossing contact portion with the rope 1 is joined.

The first rope 1 is a first body portion 1b made of a first elastic material, and a first tension body 1a that is embedded in the first body portion 1b and extends in the length direction to form a core wire. Is formed of. The cross-sectional shape of the first rope 1 (cross-sectional shape perpendicular to the length direction) is circular. The first tension body 1a is embedded in the center of the first body portion 1b, and its cross-sectional shape is circular.

Similar to the first rope 1, the second rope 2 is also embedded in the second body portion 2b made of the second elastic material and the second body portion 2b, respectively, and extends in the length direction to form a core wire. It is formed of a second tension body 2a to be formed. The cross-sectional shape of the second rope 2 is also circular. The second tension body 2a is also embedded in the center of the second body portion 2b, and its cross-sectional shape is circular.

In this screen 3, a plurality of first ropes (horizontal ropes) 1 and a plurality of second ropes (vertical ropes) 2 are arranged and crossed at equal intervals to form square openings (horizontal) arranged vertically and horizontally. An opening surrounded by a rope and a vertical rope) is formed, and the object to be sorted (the object to be screened) can be screened using this opening.

The screen 3 is used for sieving the material to be sorted by a conventional method, and may be installed in a vibration sieving machine to apply vibration to the screen 3 for sieving. In that case, a conventional hook locking portion (not shown) is usually attached to both ends of the screen 3 in the lateral direction, and the screen 3 supports the vibrating sieve via the two hook locking portions. Attached to the frame. In the screen 3 installed in the vibrating sieve via the hook locking portion, the screen 3 in a state where vibration is applied from the vibrating sieve is sorted from one end in the vertical direction of the screen 3 to the upper surface of the screen 3. The material is charged, and the charged material is screened while moving in the vertical direction.

As described above, when the screen 3 is installed and used in the vibrating sieve, a large tension is applied to the horizontal rope 1 attached to the vibrating sieve, so that the horizontal rope 1 is the lower side of the vertical rope 2 (the object to be sorted). Is arranged (or laminated) on the downstream side through which the rope passes. Therefore, the joint strength at the intersection of the horizontal rope and the vertical rope does not have to be so high.

The shape of the opening is not limited to a square shape, and may be a rectangular shape, a rhombus shape, a parallel quadrilateral shape, or the like. Of these, a square shape or a rectangular shape is preferable from the viewpoint of productivity and the like.

The opening diameter (the length of one side of the quadrangle) of the opening can be appropriately selected according to the type of the object to be sorted, and can be selected from, for example, in the range of about 2 to 35 mm. When the shape of the opening is square, the opening diameter (the length of one side of the square) is preferably about 3 to 30 mm, more preferably about 5 to 25 mm. When the shape of the opening is rectangular, the major axis (the length of the long side of the rectangle) is, for example, 5 to 35 mm, preferably 10 to 25 mm, more preferably about 12 to 20 mm, and is short. The diameter (the length of the short side of the rectangle) is, for example, about 2 to 10 mm, preferably about 2 to 5 mm.

The horizontal rope and the vertical rope may be arranged at intervals (equally spaced) in order to form such an opening diameter, and the crossing angle between the horizontal rope and the vertical rope also depends on the shape of the opening. It can be selected from a range of about 30 to 150 °, for example, 60 to 120 °, preferably 70 to 110 °, and more preferably 80 to 100 °. From the viewpoint of productivity and the like, it is particularly preferable to make the horizontal rope and the vertical rope orthogonal to each other.

The cross-sectional shape of the horizontal rope and the vertical rope is not limited to a circular shape, and various shapes such as an elliptical shape, a semicircular shape, a semicircular shape, a chevron shape, and a polygonal shape (triangular shape, square shape, rectangular shape, etc.) It may be trapezoidal, inverted trapezoidal, etc.). The cross-sectional shape may be a combination of these shapes. Further, the horizontal rope and the vertical rope may have the same cross-sectional shape or may have different cross-sectional shapes. Of these, a cross-sectional shape (for example, a semi-elliptical shape) having a flat portion extending in the length direction of the rope is easy to form because it has a large effect of suppressing clogging and it is easy to form a structure for improving wear resistance, which will be described later. , Polygonal shape, etc.) is preferable, and a cross-sectional shape in which the side surface of the rope (the rope surface along the thickness direction of the screen) is a planar shape is particularly preferable.

Examples of the cross-sectional shape in which the side surface of the rope is a planar shape include a square shape and a rectangular shape, but the upper surface and / or the lower surface of the rope may be in a curved shape shape, for example, FIG. It may have a cross-sectional shape shown in 1. In this cross-sectional shape, the upper surface of the rope has a planar shape as well as the side surface, but the lower surface has a curved surface shape (semicircular shape).

In FIG. 1, the tension body is embedded in the center of the body portion of both the horizontal rope and the vertical rope having a circular cross-sectional shape, but the exposure of the tension body is suppressed and the rope resistance is increased. From the viewpoint of improving wear resistance, it is preferable to bury it eccentrically below the center of the body portion (downstream side through which the object to be sorted passes). Further, when the tension body is eccentric and embedded in the body portion, the cross-sectional shape of the rope may be an isotropic shape such as a circular shape, but the long side is a screen from the viewpoint of improving wear resistance. Anisotropic shapes such as a rectangular shape in the direction and a cross-sectional shape shown in FIG. 2 are preferable. Also in FIG. 2, the tension body 1a is embedded below the center of the body portion 1b in the screen thickness direction.

When the tension body is eccentric and embedded in the body part, the ratio of the thickness of the thick part above the tension body to the thickness of the thin part below is the thick part / thin part = 5/1 ~. It is 1.2 / 1, preferably 3/1 to 1.5 / 1, and more preferably 2.5 / 1 to 1.8 / 1.

As described above, since the horizontal rope is subjected to a larger tension than the vertical rope, the tension body is easily damaged when the tension body is exposed due to the wear of the elastic material in the horizontal rope, but the tension is increased. When the body is damaged, the horizontal rope itself is likely to break. On the other hand, since the vertical rope does not receive as much tension as the horizontal rope, it is difficult for the vertical rope to break even if it wears and becomes thinner. Therefore, it is preferable to apply the rope in which the tension body is eccentric and embedded in the body portion to the horizontal rope. Further, for the same reason, it is preferable to apply a rope having a flat portion extending in the length direction (particularly, a rope having a flat side surface such as a rope having a cross-sectional shape shown in FIG. 2) to the horizontal rope.

The average diameter of the horizontal rope and the vertical rope can be selected from the range of about 1.5 to 20 mm, and is preferably about 3 to 18 mm. When the horizontal rope and the vertical rope have an isotropic shape (for example, a circular shape), the average diameter of the rope is, for example, 1.5 to 12 mm, preferably 2 to 10 mm, and more preferably about 3 to 8 mm.

When the horizontal rope and the vertical rope (particularly the horizontal rope) have an anisotropic shape, the average diameter in the screen thickness direction (diameter H in the case of the cross-sectional shape of FIG. 2) is, for example, about 5 to 12 mm, preferably about 8 to 12 mm. Is. The average diameter in the screen surface direction (diameter W in the case of the cross-sectional shape of FIG. 2) is, for example, about 10 to 20 mm, preferably about 11 to 18 mm. The average diameter in the screen thickness direction is preferably larger than the average diameter in the screen surface direction, and the average diameter in the thickness direction / the average diameter in the surface direction = 2/1 to 1.1 / 1, preferably 1.8 / 1. It is about 1.2 / 1, more preferably 1.6 / 1 to 1.3 / 1.

The joining method at the cross-contact portion between the horizontal rope and the vertical rope is not particularly limited, and heat welding is usually used from the viewpoint of productivity and the like. At the joint between the horizontal rope and the vertical rope, the cross-sectional shape is slightly distorted due to the joining by melting.

(Tension body)
The tension body is a cord that is usually flexible as well as the conventional tension body used for the screen. Flexible cords include fiber cords, metal cords and the like.

Examples of the fiber cord include organic fiber cords such as aromatic polyamide fibers (aramid fibers), aliphatic polyamide fibers (nylon fibers) and polyester fibers; and inorganic fiber cords such as glass fibers and carbon fibers. These fiber cords may be plyed. These fiber cords can be used alone or in combination of two or more. Of these fiber cords, the aramid fiber cord is preferable from the viewpoint of durability and the like.

Examples of the metal cord include a stainless cord, a steel cord, a copper cord, a nickel cord, a chrome cord and the like. These metal cords can be used alone or in combination of two or more. Of these, a steel cord (steel wire) is preferable from the viewpoint of durability and the like.

The shape of the tension body is not particularly limited, and is usually a substantially circular shape. The average diameter of the tension body can be selected from the range of, for example, about 0.1 to 10 mm (particularly 0.3 to 5 mm), and for the horizontal rope, the average diameter of the tension body is, for example, 0.5 to 10 mm, preferably 1. It is about 5 mm.

When the screen is installed in a vibrating sieve, a large tension is applied to the horizontal rope as described above. Therefore, it is preferable to use an aramid fiber cord or a steel cord as the tension body of the horizontal rope. On the other hand, since the vertical rope does not need as much tensile strength as the horizontal rope, any of the above-mentioned cords can be used as a preferable cord as the tension body of the vertical rope.

(Elastic material)
In the present invention, the first elastic material and / or the second elastic material of the body portion constituting the rope contains a silicone-modified resin containing an organosiloxane unit, so that clogging of the screen can be suppressed.

In the silicone-modified resin contained in the elastic material, the base resin is modified with a silicone component, and more specifically, the organosiloxane unit (silicone unit) is incorporated as a copolymer in the molecule of the base resin, so that the base resin is used. (Base resin unit) can improve the adhesion to the tension material, and the silicone component can suppress the adhesion of the object to be sorted.

The organosiloxane unit is represented by the formula: -Si (-R) ₂ -O- (in the formula, the group R is a substituent), and the substituents represented by the group R include an alkyl group and an aryl group. 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 _C6-20 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 _{C1-3 alkyl group such as a methyl group and a C6-12 aryl} group 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 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 polysiloxane diols.

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 ( In particular, it is about 6 to 18% by mass). In particular, the ratio of organosiloxane units is 3 to 15% by mass with respect to the entire silicone-modified resin, because it is possible to increase the bonding strength of intersecting ropes and improve durability while maintaining non-adhesiveness to the object to be sorted. It may be preferably about 4 to 12% by mass, more preferably about 5 to 10% by mass (particularly about 6 to 9% by mass). If the proportion of the organosiloxane unit is too small, the non-adhesiveness to the object to be sorted may decrease, and conversely, if the proportion is too large, the adhesion to the tension material 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, polyimides and the like. 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.

Polyurethane (or polyurethane elastomer) may be 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 (polyC _2-4 alkylene glycol such as polyethylene glycol and polytetramethylene glycol ether) and polycarbonate polyols (ethylene glycol and 1, Reaction products of C _2-6 alcan diols such as 4-butanediol and di C _1-4 alkyl carbonates such as dimethyl carbonate or di C _6-12 aryl carbonates 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) and the like. , 1,6,11-Undecantryisocyanate Methyl octane, 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), naphthalene diisocyanate (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 bodies (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.

Of these polyurethanes, polyether type polyurethanes and polycarbonate type polyurethanes are preferable from the viewpoint of excellent water resistance and chemical resistance, and polycarbonate type polyurethane is excellent in non-adhesiveness to the object to be sorted and can effectively suppress clogging. Polyurethane is particularly preferred.

When the silicone-modified resin is a silicone-modified polyurethane, the elastic material 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 polyisocyanate, the polyisocyanate 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.

The elastic material 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 about 1 to 10 parts by mass with respect to 100 parts by mass of the silicone-modified resin (particularly silicone-modified polyurethane).

Elastic materials include conventional additives such as chain extenders, stabilizers (weather resistant stabilizers, antioxidants, heat stabilizers, light stabilizers, etc.), fillers, plasticizers, lubricants, colorants, solvents, etc. It 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, and 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).

[Screen manufacturing method]
The horizontal rope and the vertical rope can be manufactured by using a conventional method, but in the manufacturing process, for example, an extrusion molding machine may be used as a method of coating the tension body with an elastic material. Specifically, the tension body may be pulled out from the extrusion molding machine, and the tension body may be covered with an elastic material melted and extruded from the extrusion molding machine to be solidified and integrated.

The heating temperature for melting the silicone-modified resin can be selected depending on the type of the silicone-modified resin, but in the case of the silicone-modified polyurethane, for example, it may be 100 ° C. or higher, preferably 100 to 200 ° C., more preferably 100 ° C. It is about 120 to 180 ° C. At the time of heating, pressure may be applied, and the pressure is, for example, 5 MPa or more, preferably 5 to 80 MPa, and more preferably about 9 to 75 MPa. The extrusion speed may be, for example, 2 m / min or more, for example, 2 to 30 m / min, preferably about 3 to 25 m / min.

In the manufactured rope, a plurality of vertical ropes are arranged in parallel at a predetermined interval, and a plurality of horizontal ropes are arranged in a direction orthogonal to the vertical rope at a predetermined interval. The intersecting contact portions of the horizontal rope and the vertical rope are joined by heat welding or the like to form a screen. In the process of arranging and welding the rope, a method of placing the rope on a plate and welding it, or a method of winding the rope on a roll and welding it can be selected depending on the thickness of the rope to be produced.

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]
Elastic material 1: Silicone-modified polycarbonate type thermoplastic urethane elastomer ["Resamine PS" manufactured by Dainichi Seika Kogyo Co., Ltd., silicone content 8% by mass]
Elastic material 2: Silicone-modified polycarbonate type thermoplastic polyurethane elastomer ["Resamine PS" manufactured by Dainichiseika Kogyo Co., Ltd., silicone content 16% by mass]
Elastic material 3: Silicone-modified polyether type thermoplastic polyurethane elastomer ["Resamine PS" manufactured by Dainichi Seika Kogyo Co., Ltd., silicone content 8% by mass]
Elastic material 4: Silicone-modified polyether type thermoplastic polyurethane elastomer ["Resamine PS" manufactured by Dainichi Seika Kogyo Co., Ltd., silicone content 16% by mass]
Elastic material 5: Polyester type thermoplastic polyurethane elastomer [Silicone unmodified product, "Milactran E385" manufactured by Nippon Miractran Co., Ltd.]
Steel cord (φ1.24): manufactured by Jiangsu Fasten Steel Cord, number of strands 7, number of strands 7, cord diameter 1.24 mm
Steel cord (φ3.3): manufactured by Jiangsu Fasten Steel Cord, 7 strands, 7 strands, 3.3 mm cord diameter
Glass cord (φ0.5): manufactured by Unitika Glass Fiber Co., Ltd., ECG150 S3 / 3-3.6S, cord diameter 0.5 mm.

Example 1
Using the materials shown in Table 1, while pulling out the tension body from the extruder, the tension body is covered with an elastic material extruded under the conditions of a temperature of 160 ° C. and a pressure of 65 MPa, solidified and integrated, and laterally. Rope and vertical rope were made respectively. A plurality of prepared vertical ropes were placed in parallel on the plate at predetermined intervals, and a plurality of horizontal ropes were further arranged at predetermined intervals in a direction orthogonal to the vertical ropes. The intersecting contact portions of the horizontal rope and the vertical rope were joined by heat welding by applying hot air at 250 ° C. to manufacture a screen of a small diameter rope (screen size: 2500 mm × 1500 mm, opening 7 mm × 7 mm).

Example 2
A screen was manufactured in the same manner as in Example 1 except that the elastic material of the rope was changed to the elastic material 2.

Example 3
A screen was manufactured in the same manner as in Example 1 except that the elastic material of the rope was changed to the elastic material 3.

Example 4
A screen was manufactured in the same manner as in Example 1 except that the elastic material of the rope was changed to the elastic material 4.

Example 5
Using the materials shown in Table 2, a large-diameter rope screen (screen size: 2500 mm × 1500 mm, opening 21 mm × 21 mm) was manufactured by the same procedure as in Example 1 except that the pressurizing condition was 11 MPa.

Example 6
A screen was manufactured in the same manner as in Example 5 except that the elastic material of the rope was changed to the elastic material 2.

Example 7
A screen was manufactured in the same manner as in Example 5 except that the elastic material of the rope was changed to the elastic material 3.

Example 8
A screen was manufactured in the same manner as in Example 5 except that the elastic material of the rope was changed to the elastic material 4.

Example 9
Using the materials shown in Table 3, the procedure was the same as in Example 1 except that the pressurizing condition of the horizontal rope was 17 MPa and the pressurizing condition of the vertical rope was 11 MPa, and the cross-sectional shape was the anisotropic shape shown in FIG. A screen (screen size: 2500 mm × 1500 mm, opening 21 mm × 21 mm) was manufactured.

Comparative Example 1
A screen was manufactured in the same manner as in Example 1 except that the elastic material of the rope was changed to the elastic material 5 (silicone-unmodified polyether type thermoplastic polyurethane elastomer).

Comparative Example 2
A screen was manufactured in the same manner as in Example 5 except that the elastic material of the rope was changed to the elastic material 5 (silicone-unmodified polyether type thermoplastic polyurethane elastomer).

Comparative Example 3
A screen was manufactured in the same manner as in Example 9 except that the elastic material of the rope was changed to the elastic material 5 (silicone-unmodified polyether type thermoplastic polyurethane elastomer).

(Evaluation of joint strength of crossing rope)
From the screens produced in Examples 1 to 9 and Comparative Examples 1 to 3, one vertical rope 1 and one horizontal rope 2 are cut out so as to leave only one crossing contact portion between the vertical rope 1 and the horizontal rope 2. A test piece was collected. Then, as shown in FIG. 3, one end of the vertical rope 1 and the horizontal rope 2 of the collected test piece is sandwiched and fixed by the chucks 1A and 2A, respectively, and the tensile tester ("Strograph T" manufactured by Shimadzu Corporation) is used. ), The rope was pulled in the direction of the arrow at a speed of 5 mm / min, and the strength at which the cross-contact portion was peeled off (that is, the joint strength) was measured.

Table 4 shows the results of evaluating the joint strength of the crossed rope.

(Evaluation of non-adhesiveness of screen)
The screens obtained in Examples 1 to 8 and Comparative Examples 1 and 2 are cut into predetermined dimensions (width 215 mm, length 330 mm) to form test pieces, which are placed on a horizontally movable table (rectangular table). In addition, the length direction of the test piece is parallel to the length direction of the table and fixed. Next, an adhesive tape (width 50 mm, length 250 mm) was placed in the center of the surface (upper surface of the screen) of the test piece so that the length direction of the adhesive tape was parallel to the length direction of the table and the test piece. Press with a roller to paste. Furthermore, the load cell is fixed on one side in the length direction of the table, and one end of the adhesive 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 grasped 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, and the adhesive tape is peeled 180 degrees from the surface of the test piece, and the peeling force is measured. The peeling force was an average value excluding the peak value at the initial stage of peeling.

Table 4 shows the results of evaluating the non-adhesiveness of the screen.

(Clogging evaluation)
The screens prepared in Examples 1 to 9 and Comparative Examples 1 to 3 were used to evaluate clogging. Each screen is cut to a predetermined size (width 215 mm, length 330 mm) and placed in a metal frame. Next, as shown in FIG. 4, the screen 3 fixed by the metal frame is fixed to the L-shaped angle 4 with an inclination angle of 20 °. As a sample, a mixture of gravel and crushed stone 5 [grain size: 1 to 5 mm (Examples 1 to 4 and Comparative Example 1), 1 to 15 mm (Examples 5 to 9 and Comparative Examples 2 to 3), water content: 10%] was placed near the center position on the screen, the screen was vibrated by the vibrating device 6 for 60 seconds, and the weight of the sample dropped from the opening was measured. As an index of clogging, as shown in the following formula, the drop rate was calculated from the weight of the sample dropped from the opening of the screen with respect to the total weight of the sample placed on the screen.

Drop rate (%) = [Weight dropped from the opening (g) / Weight placed on the screen (g)] x 100

Table 4 shows the results of evaluating the clogging of the screen.

As is clear from the results in Table 4, regarding the joint strength of the cross rope, the joint strength of the cross rope (cross contact portion) was lower in each of the silicone-modified examples than in each of the comparative examples of unmodified silicone. , There was no problem in practical use. Further, the higher the silicone content, the lower the bonding strength.

Regarding the non-adhesiveness, the peeling force of Examples 1 to 4 was smaller than that of Comparative Example 1 and that of Examples 5 to 8 was smaller than that of Comparative Example 2, and the non-adhesiveness was improved. In addition, the higher the silicone content, the better the non-adhesiveness. Moreover, when comparing the types of silicone-modified polyurethane, the polycarbonate type was somewhat superior in non-adhesiveness to the polyether type.

Further, regarding clogging, Examples 1 to 4 had a higher drop rate than Comparative Example 1, Examples 5 to 8 had a higher drop rate than Comparative Example 2, and Example 9 had a higher drop rate than Comparative Example 3. It turned out that the example screen was less likely to be clogged.

Example 10 and Comparative Example 4
The screen was manufactured by the same method as described in Example 1 so as to have the materials and sizes shown in Table 5.

Comparative Example 5
Conventional metal screens made of stainless steel mesh of the sizes listed in Table 5 were used.

(Evaluation in a vibrating sieve (actual machine))
Using the screens produced in Example 10 and Comparative Example 4 having a width of 1445 mm and a length of 1200 mm and the screen of Comparative Example 5, a vibrating sieve having a path of 3.6 m in which three screens are arranged in the longitudinal direction (vertical direction in FIG. 1). The evaluation was done by the machine. That is, as shown in FIG. 5, three screens are arranged in the longitudinal direction with both ends of the screen 3 in the width direction (horizontal direction of FIG. 1) fixed to the clamping bar 7 via hooks (not shown). The object to be sorted (processed object) 8 is thrown onto the screen from one end of the 3.6 m path formed by the above process, and is dropped from the opening while being transferred toward the other end in the direction of the arrow in the figure. Sifting was performed. The unit of size (dimensions) in Table 5 and FIG. 5 is all mm. The evaluation conditions are as shown in 1) to 4) below.

1) Object to be sorted: Limestone with a diameter of 5 mm or less 2) Moisture content: 7 to 8% (sprinkle water on the screen as a measure against dust)
3) Processing amount: 35 tons or more / hour 4) Period: Until the life of the screen

As is clear from the results in Table 5, the stainless steel screen of Comparative Example 5 was significantly worn and had a short life of one month. Further, the screen of Comparative Example 5 was easily clogged and had to be knocked off with a jig.

On the other hand, the screen using the elastic material (Example 10 and Comparative Example 4) was suppressed in wear and the life was extended to 6 months.

On the other hand, when Example 10 and Comparative Example 4 are compared, Example 10 using the silicone-modified polyurethane elastomer is less likely to be clogged than Comparative Example 4 using the silicone-unmodified polyurethane elastomer, and many subjects are covered. It was possible to pass (process) the selected material (limestone). As a result, in Example 10, the passing amount (processing amount) per hour was improved 1.25 times (25% increase) from 40 tons to 50 tons as compared with Comparative Example 4.

In addition, although the life (replacement time) of Example 10 and Example 11 (Comparative Example) was the same as 6 months, Example 10 was able to process more in the same period (many selections). Considering that the object is in contact with the screen), it can be said that the life is improved.

The screen of the present invention can be used as a screen for sieving lumps and powders such as ore, crushed stone, coke, and chemicals, and is particularly useful as a screen installed in a vibration sieving machine.

1 ... 1st rope 1a ... 1st elastic material 1b ... 1st elastic material 2 ... 2nd rope 2a ... 2nd elastic material 2b ... 2nd elastic material 3 ... Screen 4 ... L-shaped angle 5 ... Gravel and crushed stone Mixture 6 ... Vibration device

Claims (10)

A first rope, which is a plurality of striatum arranged parallel to the first direction at intervals, and a space on the first rope parallel to the second direction intersecting the first direction. A screen formed of a second rope, which is a plurality of strips that are arranged and placed and whose cross-contact points with the first rope are joined, and the first rope is each the first. A first body portion made of one elastic material and a first tension body embedded in the first body portion and extending in the length direction to form a core wire are formed, and the second rope is a second rope, respectively. A second body portion made of two elastic materials and a second tension body embedded in the second body portion and extending in the length direction to form a core wire, and the first elastic material and / Alternatively, the front second elastic material is a screen containing a silicone-modified resin containing an organosiloxane unit. The screen according to claim 1, wherein the silicone-modified resin is a thermoplastic resin or a thermoplastic elastomer. The screen 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 screen according to any one of claims 1 to 3, wherein the silicone-modified resin is a silicone-modified polyurethane. The screen according to claim 4, wherein the silicone-modified polyurethane is a polyether-type polyurethane or a polycarbonate-type polyurethane silicone-modified resin. The screen according to claim 1 or 2, wherein the silicone-modified resin is a polycarbonate-type polyurethane containing 3 to 15% by mass of an organosiloxane unit. The screen according to any one of claims 1 to 6, wherein the first rope and / or the second rope has a flat surface portion extending in the length direction. The screen according to any one of claims 1 to 7, wherein the first tension body and the second tension body are fiber cords or metal cords. The screen according to any one of claims 1 to 8, wherein the second direction is orthogonal to the first direction. The screen according to any one of claims 1 to 9, which is a screen installed in a vibrating sieve.

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