Provided are a temperature detection device and method that can simply and accurately detect the presence or absence of abnormal heating of a conveyor belt. Correlation data (R) between an electrical resistance value of a passive IC tag (2) embedded in a conveyor belt (13) and a temperature of the IC tag when the IC tag (2) is activated is grasped in advance when the IC tag (2) receives a transmitted radio wave (W1) from a non-contact detector (7). Data of an electrical resistance value when the IC tag (2) is activated is received by the detector (7) through a returned radio wave (W2) returned from the IC tag (2) in response to the transmitted radio wave (W1) transmitted from the detector (7) toward the IC tag (2) embedded in the conveyor belt (13) running. A temperature at a position of the conveyor belt (13) where the IC tag (2) is embedded is calculated by a calculation unit (8) in accordance with the data of the electrical resistance value received and the correlation data (R).
B65G 43/02 - Control devices, e.g. for safety, warning or fault-correcting detecting dangerous physical condition of load- carriers, e.g. for interrupting the drive in the event of overheating
2.
DEVICE AND METHOD FOR DETECTING VERTICAL TEAR IN CONVEYOR BELT
Provided are a detection device and method whereby it is possible to accurately detect the presence or absence of a longitudinal tear in a conveyor belt, while having high versatility and low cost. An embedded body 2, which has one antenna 4 and a passive IC tag 3, connected to the one antenna 4, at one end of a coaxial cable 6 and the other antenna 5 at the other end, is embedded in a conveyor belt 17 with the one antenna 4 and IC tag 3 spaced apart from the other antenna 5 in the width direction and with the coaxial cable 6 extended in the width direction. A calculation unit 12 determines whether or not a detector 10 has received the radio wave R2 transmitted from the IC tag 3 through the coaxial cable 6 and the other antenna 5 in response to the radio wave R1 transmitted from the detector 10 to the other antenna 5, and detects, on the basis of the determination result, the presence or absence of a longitudinal tear in the conveyor belt 17 in the area where the coaxial cable 6 is embedded.
B65G 15/08 - Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration the load-carrying surface being formed by a concave or tubular belt, e.g. a belt forming a trough
B65G 43/02 - Control devices, e.g. for safety, warning or fault-correcting detecting dangerous physical condition of load- carriers, e.g. for interrupting the drive in the event of overheating
The present invention addresses the problem of providing a surface-treated nanocellulose master batch that can be used to obtain a rubber composition in which nanocellulose is homogenously dispersed and which has excellent stretchability, hardness, water resistance, and tear resistance. To solve the problem, this surface-treated nanocellulose master batch contains a rubber component, nanocellulose, a resole type and/or a novolac type resorcin-formaldehyde initial condensation product, and formaldehyde, wherein 0.3-15 parts by mass of the nanocellulose is contained with respect to 100 parts by mass of the rubber component, and 0.03-1.2 parts by mass of the resole type and/or novolac type resorcin-formaldehyde initial condensation products and 0.02-0.8 parts by mass of the formaldehyde are contained with respect to 1 part by mass of the nanocellulose.
A conveyor belt 10 is formed by covering a belt core 14 with cover rubber 12. The cover rubber 12 is configured such that at least a portion of the surface thereof has a micro-asperity structure, and as a result of the micro-asperity structure, the surface roughness is 1 µm to 12 µm, the sharpness is 2 to 9, and the specular gloss with an incident angle of 60° is 0.1 to 10. In particular, it is preferable that the surface roughness be 2 µm to 5 µm, that the sharpness be 3 to 5, and that the specular gloss with an incident angle of 60° be 0.1 to 3. Due to this configuration, the conveyor belt 10 is less likely to have external appearance defects resulting from bloom.
In an embodiment of the present invention, to provide an epoxy resin composition for a fiber-reinforced composite material having excellent heat resistance, toughness, and workability, per 100 parts by mass of an epoxy resin component containing from 60 to 85 parts by mass of N,N,N',N'- tetraglycidyldiaminodiphenylmethane resin component (A) having a viscosity at 50 C of 6000 mPa-s or less and from 15 to 40 parts by mass of a liquid bisphenol A epoxy resin component (B) having a viscosity at 25 C of 20000 mPa=s or less, from 8 to 15 parts by mass of a thermoplastic resin (C), from 2 to 10 parts by mass of elastomer microparticles (D) having an average particle diameter of 1000 nm or less, and from 0.5 to 2.5 parts by mass of silica microparticles (E) having an average particle diameter of 1000 nm or less are blended.
The purpose of the present invention is to provide a cyanate ester resin composition such that resin flow when heated to cure can be suppressed without the addition of a thermoplastic resin to control viscosity, resin defects and uneven thickness are eliminated, and excellent workability is exhibited. The composition comprises (A) a cyanate ester resin, (B) a curing agent or a curing accelerator, (C) silica microparticles, and (D) core shell rubber particles, the amounts of (C) the silica microparticles and (D) the core shell rubber particles are, respectively, 1 to 5 parts by mass and 2 to 10 parts by mass with respect to 100 parts by mass of (A) the cyanate ester resin, and the mass ratio (C)/(D) of the (C) the silica microparticles to (D) the core shell rubber particles is 1/1 to 1/5.
C08L 79/04 - Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
C08J 5/24 - Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
C08L 51/04 - Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
In a pneumatic tire are defined: a first imaginary line VL1 passing through a ground contact surface in a meridian cross section of a tread portion, a second imaginary line VL2 passing through a bottom portion of a shoulder main groove and parallel to VL1 , an intersection point between VL2 and a surface of a shoulder land portion outward of a ground contact edge T in a lateral direction, and an equatorial plane CL. Given A as a distance in the lateral direction between an intersection point P and CL, B as a groove depth of the shoulder main groove, and C as a distance in the lateral direction between T and CL, 0.80 <= (B+C) / A <= 1.15 is satisfied and, given E as a distance in the lateral direction between the bottom portion of the shoulder main groove and P, 2.0 <= E/B <= 5.0 is satisfied.
B60C 11/13 - Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
B60C 9/08 - Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship the cords extend transversely from bead to bead, i.e. radial ply
B60C 9/18 - Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
B60C 11/00 - Tyre tread bands; Tread patterns; Anti-skid inserts
B60C 11/01 - Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
On a pneumatic tire are defined a first imaginary line VL1 passing through a ground contact surface in a meridian cross section of a tread portion, a second imaginary line VL2 passing through a bottom portion of a shoulder main groove and parallel to VL1, an intersection point P between VL2 and a surface of a shoulder land portion outward from a ground contact edge in a lateral direction, and an equatorial plane CL. 0.80 <= (B+C)/A <= 1.15 is satisfied, where A represents a distance in the lateral direction between P and CL, B represents a depth of the shoulder main groove, and C represents a distance in the lateral direction between the ground contact edge and CL. 0.75 <= S/A <= 0.95 is satisfied, where S represents a distance in the lateral direction between CL and an end portion of a longest belt ply in the lateral direction.
A pneumatic tire is provided with a tread portion and side portions. The tread portion includes shoulder main grooves and shoulder land portions. The following are defined in a meridian cross section of the tread portion: a first imaginary line passing through a ground contact surface, a second imaginary line passing through a bottom portion of a shoulder main groove and parallel to the first imaginary line, an intersection point between the second imaginary line and a surface of a shoulder land portion, and a tire equatorial plane. Given A as a distance in the tire lateral direction between the intersection point and the tire equatorial plane, B as a groove depth of the shoulder main groove, and C as a distance in the tire lateral direction between the tire equatorial plane and the ground contact edge, the condition 0.80 <= (B+C) / A <= 1.15 is satisfied.
The present technology provides an epoxy resin composition for a fiber-reinforced composite material, a method for producing an epoxy resin composition for a fiber-reinforced composite material, a prepreg, and a honeycomb panel. The epoxy resin composition for a fiber-reinforced composite material of the present technology contains: a reaction product obtained by reacting 100 parts by mass of a phosphorus-containing epoxy resin containing a phosphorus atom in the backbone thereof, and not less than 5 parts by mass and not greater than 20 parts by mass of an amino-terminated butadiene-acrylonitrile rubber; an epoxy resin other than the phosphorus-containing epoxy resin; a curing agent; and a curing accelerator.
C08G 59/20 - Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups characterised by the epoxy compounds used
B32B 3/12 - Layered products essentially comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products essentially having particular features of form characterised by a discontinuous layer, i.e. apertured or formed of separate pieces of material characterised by a layer of regularly-arranged cells whether integral or formed individually or by conjunction of separate strips, e.g. honeycomb structure
B32B 5/28 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous one layer being a fibrous or filamentary layer impregnated with or embedded in a plastic substance
C08G 59/56 - Amines together with other curing agents
C08J 5/24 - Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
11.
DEVICE FOR MEASURING STATE OF CONTACT OF SUPPORT ROLLER OF CONVEYOR BELT
Provided is a device for measuring the state of contact of a support roller of a conveyor belt, the device precisely detecting how the support roller is in contact with the conveyor belt during the traveling of the conveyor belt. A pressure sensor (5) provided on the rotating surface (2a) of a measuring roller (2), which rotates in contact with the inner peripheral surface (16) of a conveyor belt (15) stretched between pulleys, detects resistance force (f) acting when the conveyor belt (15) rides over the measuring roller (2), a rotational position sensor (6) detects the circumferential position, on the rotating surface (2a), of the pressure sensor (5), the data thus detected are sequentially wirelessly transmitted to the outside of the measuring roller (2) by a transmission unit (8) installed on the measuring roller (2), and the transmitted detection data are received by a receiver (9).
The purpose of the present invention is to provide a rubber composition for a conveyor belt, the rubber composition allowing significant reductions in power consumption at low temperatures when the conveyor belt is formed, and also to provide a conveyor belt. The rubber composition for a conveyor belt of the present invention comprises: a rubber component containing butadiene rubber and/or styrene butadiene rubber, carbon black, sulfur, and a vulcanization accelerator; the glass transition temperature of the butadiene rubber and the styrene butadiene rubber being -65°C or lower; the nitrogen adsorption specific surface area of the carbon black being 90 m2/g or less; the total content of the butadiene rubber and the styrene butadiene rubber being 50% by mass or greater relative to the content of the rubber component; the content of the carbon black being from 30 to 50 parts by mass per 100 parts by mass of the rubber component; and the mass ratio (sulfur/vulcanization accelerator) of the content of the sulfur to the content of the vulcanization accelerator being 1.5 or less.
Provided are a steel cord and a method of manufacturing a rubber product that allow for the suppression of reductions in cord strength caused by the heat of a vulcanization process. A steel cord (1) has a stranded structure comprising a plurality of sheath strands (3) intertwined around the outer circumferential surface of a core strand (2); and a filament (4) having a linear mass density of at least 560 dtex and not more than 2,200 dtex wrapped in a spiral around the outer circumferential surface of the core strand (2). The steel cord (1) is embedded in an unvulcanized rubber member to mold a molded rubber article (7), which is then vulcanized.
D07B 1/06 - Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
D06M 15/41 - Phenol-aldehyde or phenol-ketone resins
D06M 15/693 - Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials with macromolecular compounds; Such treatment combined with mechanical treatment with natural or synthetic rubber, or derivatives thereof
14.
RUBBER COMPOSITION FOR HEAT-RESISTANT CONVEYOR BELTS, AND HEAT-RESISTANT CONVEYOR BELT
The purpose of the present invention is to provide a rubber composition for heat-resistant conveyor belts, which has achieved high physical properties, while at least maintaining heat resistance and processability. A rubber composition for heat-resistant conveyor belts according to the present invention contains an ethylene-butene copolymer and an ethylene-propylene-diene copolymer. The mass ratio of the ethylene-butene copolymer to the ethylene-propylene-diene copolymer [(ethylene-butene copolymer)/(ethylene-propylene- diene copolymer)] is from 5/95 to 95/5; and the amount of diene units in the ethylene-propylene-diene copolymer is 2.0% by mass or less relative to 100 parts by mass of the total of the ethylene-butene copolymer and the ethylene-propylene-diene copolymer. The present invention also provides a heat-resistant conveyor belt which uses this rubber composition for heat-resistant conveyor belts.
Provided are: a rubber composition that has excellent adhesiveness to galvanized steel cords and that has improved flame retardancy and cold resistance; and a conveyor belt. This rubber composition is a rubber composition that includes: a rubber component including butadiene rubber, chloroprene rubber, and natural rubber; an organic cobalt salt; rosin or a rosin derivative; and an organochlorine compound. The content of said butadiene rubber is from 5 parts by mass to 20 parts by mass inclusive per 100 parts by mass of said rubber component. The content of said chloroprene rubber is from 20 parts by mass to 65 parts by mass inclusive per 100 parts by mass of said rubber component. The content of said organic cobalt salt is from 0.2 parts by mass to 1.0 part by mass inclusive per 100 parts by mass of said rubber component when the mass of said organic cobalt salt is converted to that of cobalt. The content of said rosin or rosin derivative is from 2 parts by mass to 9 parts by mass inclusive per 100 parts by mass of said rubber component. The content of said organochlorine compound is from 5 parts by mass to 35 parts by mass inclusive per 100 parts by mass of said rubber component.
A pneumatic tire includes a tread that has: land portions formed and segmented by a plurality of circumferential grooves extending in a tire circumferential direction and by a plurality of widthwise grooves extending in a tire width direction; and sipes formed in contact patches of the land portions. The pneumatic tire includes: recessed sections (groove-bottom recessed sections) that are formed in tire-width-direction lateral surfaces of the land portions provided in tire-width-direction outermost parts, so as to connect to the widthwise grooves; and indents/lugs that are formed in bottom surfaces of the recessed sections such that indents/lugs thereof are arranged alternately and continuously in a linear manner.
This pneumatic tire has a plurality of recesses 22 provided on the surface of each figure 21 of a first indication portion 20. The recesses 22 are provided so as to extend in the tire circumferential direction and are aligned side by side with each other in a direction crossing the extending direction. One end side and the other end side in the width direction of each recess 22 are formed by curved surfaces of which a center of curvature is disposed at the outside in the tire width direction. Therefore, gradation of brightness occurs on the curved surface on the each recess 22. The gradation on the each recess 22 changes depending on the viewing direction or the lighting direction. Therefore, each figure 21 in the first indication portion 20 looks three-dimensionally and can become more conspicuous than the other portions of a side wall 10.
There is provided a pneumatic tire having improved snow traction and groove-crack resistance comprising a tread having a plurality of blocks divided by grooves, wherein a ratio of a block facing length c to a width b of the groove is 0.50 <= c/b <= 1.30, a ratio of the block facing length c to a depth a of the groove is 0.40 <= c/a <= 0.85, wherein c is a length of a shorter line segment obtained by selecting a pair of blocks adjacent to each other across a groove from a plan view of the tread, drawing perpendicular lines from two vertices of one block on a side of a sandwiched groove to other block across the sandwiched groove, respectively, connecting ends of the perpendicular lines by a line segment along an outer circumference of the block, and comparing a length of the line segment between the blocks.
A tread area is divided into a plurality of lands by a plurality of grooves formed in the tread area. Each of the grooves includes a plurality of protrusions arranged at intervals on a bottom of the groove. The protrusions are lower than the lands from the bottom of the groove, and separated from the lands. Each of the protrusions includes a protrusion main body having a top portion that is a highest portion from the bottom of the groove, and a slope portion having a slop that makes an angle with the bottom of the groove in a range between 3 degrees and 60 degrees. The slope portion is formed in at least one direction along the groove.
In a pneumatic tire, a block unit includes a center block and side blocks separated by a communication groove. Aspect ratios of the center block and the side blocks are approximately the same, The center block and the side blocks are arranged such that a longitudinal direction of a rectangle relating to the aspect ratio of the center block and longitudinal directions of rectangles relating to the aspect ratios of the side blocks are approximately orthogonal to each other. Size ratios of a short side of the rectangle relating to the aspect ratio of the center block and the long sides of the rectangles relating to the aspect ratios of the side blocks are in a range equal to or more than 0.90 to equal to or less than 1,10.
patents
