摘要:
An air filter medium comprising a porous polytetrafluoroethylene film and an air-permeable support member laminated on at least one surface of said porous film and having a PF1 value exceeding 22, which is calculated according to the following formula: PF1=[−log(Penetration (%)/100)/Pressure loss (mmH2O)]×100 in which the penetration (%)=100−Collection efficiency from a pressure loss (unit: mmH2O) measured when an air is flowed through the air filter medium at a flow velocity of 5.3 cm/sec. and a collection efficiency (unit: %) measured using dioctyl phthalate having a particle size of 0.10 to 0.12 &mgr;m. This air filter medium has a low pressure loss and a high collection efficiency.
摘要:
A method of laminating at least two gas permeable sheet materials includes: (1) providing at least a first gas permeable sheet material, wherein at least a portion of at least a surface region of the first sheet material is thermoplastic material; (2) providing at least a second gas permeable sheet material of polytetrafluoroethylene; (3) superposing the sheet materials; and (4) contacting the sheet materials with a heating means to heat the thermoplastic material to a temperature from 140° to 230° C., so as to melt the thermoplastic material and laminate the sheet materials to one another, without the application of direct pressure in the thickness direction of the sheet materials during the contacting step so as to form a gas permeable laminate.
摘要:
A mechanism, of a camera, for surely resetting a microcomputer at time of switching among a plurality of types of power sources. In the mechanism in which a manual operation dial for switching among the plurality of types of power sources is rotated to slide an electrical contact piece over a predetermined electrically conductive/non-conductive pattern so that a desired power source type is selected, an electric conductivity/non-conductivity between an IC and a negative terminal changes, immediately before an electric power across a positive terminal and the negative terminal is changed from “ON” to “OFF”, and immediately after the electric power is changed from “OFF” to “ON”. In association with the change, the IC outputs a reset signal to the microcomputer of the camera.
摘要:
A filter medium which has an average pore diameter of more than 0.5 &mgr;m, a pressure loss of 2-50 mmH2O determined when air is permeated therethrough at a velocity of flow of 5.3 cm/sec, and a PF value of 18-12, which is calculated in accordance with the following equation on the basis of this pressure loss and a collection efficiency using DOP of a grain size of 0.10-0.12 &mgr;m. PF value = - log ( permeability ( % ) / 100 ) Pressure Loss × 100. Permeability (%)=100 −Collection Efficiency (%).
摘要:
This invention relates to lens type functional retroreflective sheeting having retroreflective regions and visual functionality presenting regions, the retroreflective sheeting comprising:a base sheet consisting of a support comprising a functional resin layer containing a functional pigment having light-storing or fluorescent properties, microspherical lens-embedding regions in which microspherical lenses are densely distributed on the surface of the functional resin layer of the support so as to form a mono-layer, and microspherical lens-free regions in which substantially no microspherical lens is embedded and the functional resin layer is exposed;a transparent protective film disposed above the microspherical lens-bearing surface of the base sheet; andbonds at which said base sheet and said transparent protective film are partly bonded together. This lens type functional retroreflective sheeting not only afford good visibility to viewers positioned in the direction of the light source (e.g., automobile drivers), but also afford good visibility at night to drivers and pedestrians positioned in directions different from the that of the light source.
摘要:
The present invention discloses lens-type retroreflective sheeting excellent in appearance and having constant thickness and desired retroreflective performance, wherein the transparent microspheres in the retroreflective layer are composed of transparent microspherical lenses (A) having a refractive index of 1.8 or more and transparent microspherical fillers (B) having a refractive index different by at least 5% from the refractive index of the lenses (A).
摘要:
A film treating agent for a non-oriented electrical steel sheet having excellent film characteristics such as high space factor, punchability, weldability, and adhesion, and having excellent lubricating properties after stress relief annealing agent comprises, as principal components thereof, 100 parts by weight, calculated in terms of the solid, of at least one member selected from the group consisting of aluminum phosphate, calcium phosphate and zinc phosphate, as an inorganic material, and 1 to 300 parts by weight of a coarse grain emulsion resin having a grain size of 0.3 to 3.0 .mu.m, as an organic material.
摘要:
The present invention provides a method for producing retroreflective sheeting useful for marking or the like of signs such as road signs and construction signs; number plates of vehicles such as motorcars and motorcycles; materials for safety such as clothes and life jackets; signboards, etc., and the method is a method for producing retroreflective sheeting, which comprises embedding glass beads substantially in a monolayer in a temporary support at least one surface of which is composed of a thermoplastic resin in such a manner that at least part of each bead is embedded in the thermoplastic resin; forming a vapor-deposited metal film on the surface in which the glass beads were embedded; superposing thereon a thermoformable support film; pressing the resultant superposed matter under heating to embed the vapor-deposited metal film portion of each of the glass beads in the support film; and peeling the temporary support from the superposed matter in such a manner that the glass beads remain in the support film, said method being characterized in that a thin film containing a coupling agent is previously formed on the vapor-deposited metal film of the temporary support in which the glass beads are embedded and on which the vapor-deposited metal film is then formed, and then the support film is superposed thereon.
摘要:
The present invention comprises lens-type retroreflective sheeting which is excellent in appearance and having constant thickness and desired retroreflective performance, wherein the transparent microspheres in the retroreflective layer are composed of transparent microspherical lenses (A) having a refractive index of 1.8 or more and transparent microspherical fillers (B) having a refractive index different by at least 5% from the refractive index of the lenses (A).
摘要:
A novel electromagnetic balance-type weighing apparatus according to the invention includes a weighing pan/balance beam assembly (15) whose balance beam is angularly displaced as a function of the weight of an object of weighing placed on the weighing pan. An electromagnetic coil (9) is provided to generate an electromagnetic force that offsets the displacement of the balance beam of the weighing pan/balance beam assembly (15) caused by the weight of the object of weighing. A displacement detector (3, 4, 5) is provided to detect the displacement of the balance beam of the weighing pan/balance beam assembly (15). An operation unit (7) performs operations to determine a control voltage in response to the detection signal transmitted from the displacement detector (3, 4, 5). A current transducer circuit (20) generates an electric current in response to the control voltage applied to it by the operation unit (7) and supplies it to the electromagnetic coil (9). The current transducer circuit (20) comprises a negative feedback loop circuit for feeding the output current from said current transducer circuit (20) back to the input terminal of the current transducer circuit (20). A weight calculator (24) calculates the weight of the object of weighing from the output current of the current transducer circuit (20).