46results about How to "High dimensional stability" patented technology

A new, faster and more efficient process to replace heating walls and ceilings in coke oven batteries. Thus, when replaced, at least one heating wall is constructed of thermally stable non-expanding large size modular cast modules from end to end and the ceiling adjacent the heating wall is constructed of thermally stable non-expanding large modular cast blocks.

The invention discloses a composite electromagnetic-shielding copper clad laminate with a heat conduction effect and a manufacture method of the composite electromagnetic-shielding copper clad laminate. The composite electromagnetic-shielding copper clad laminate, manufactured by utilizing the manufacture method, comprises a copper foil layer, an insulated polymer layer, a metal shielding layer, an electric conduction glue layer and a sixth stacking layer which are sequentially overlapped, wherein the sixth stacking layer is a metal layer or a release material layer. The composite electromagnetic-shielding copper clad laminate simultaneously has high heat dissipation and electromagnetic-shielding functions, can be applied to electronic products with relatively strict requirements on electromagnetic compatibility and is further used for solving the problem that the heat of electronic products cannot be timely dissipated. According to the composite electromagnetic-shielding copper clad laminate with the heat conduction effect and the manufacture method of the composite electromagnetic-shielding copper clad laminate with the heat conduction effect, a mode for using a conventional copper foil base material in a manner of being matched with shielding films and radiating electronic components is replaced, and original combination of multiple materials is replaced by a composite material, so that the material cost is saved, the thickness of products is decreased, the production process links are decreased, and the integral size stability of the base material of the products can be better improved.

The invention relates to the field of film or sheet products produced by plastic or plastic state substance, in particular to a five-layer co-extruded fiber felt reinforced plastic composite board. The five-layer co-extruded fiber felt reinforced plastic composite board is composed of plastic layers and fiber felts and is characterized in that there are three plastic layers and two fiber felts, the three plastic layers are respectively arranged in parallel, the three plastic layers are respectively a top layer, an intermediate layer and a bottom layer, a layer of fiber felts is respectively lined between the top plastic layer and the intermediate plastic layer and between the intermediate plastic layer and the bottom plastic layer, and the plastic layer is prepared from any one of polypropylene, polyethylene and rigid polyvinyl chloride. The five-layer co-extruded fiber felt reinforced plastic composite board provided by the invention is high in strength, low in density, good in weather resistance and wide in range of application.

This invention relates to porous paper machine clothing (1, 11, 21) for de-watering a paper web in a paper machine, comprising a filament lay-up made of at least one layer (2, 12, 22) of longitudinal filaments (3, 13, 23) and at least one layer (4, 14, 24) of transverse filaments (5, 6, 7; 15; 25) which cross the longitudinal filaments (3, 13, 23), wherein the longitudinal and transverse filaments (3, 13, 23; 5, 6, 7; 15; 25) are single-component filaments, which is characterised in that the longitudinal and transverse filaments (3, 13, 23; 5, 6, 7; 15; 25) are fused at crossing points (8, 16, 27) to each other and/or to parts (17, 18, 19) joining them as a result of heating to the melting temperature which is restricted to said crossing points (8, 16, 27).

The invention further relates to a method of producing porous paper machine clothing such as this.

The invention discloses a manufacture method of flexible glue-free double-face copper clad. The copper clad is of a five-layer structure respectively comprising copper clad, a thermoplastic polyimide layer, a thermosetting polyimide layer, a thermoplastic polyimide layer and copper clad. The manufacture method is that thermoplastic polyimide (TPI) solution is coated on two surface of a polyimide film respectively, and after drying, the polyimide film is once-pressed with the two layers of copper clad. The copper clad manufactured through the method is high in production efficiency and product yield and good in size stabilizing performance.

The present invention provides a polyimide resin, which is prepared by epolycondensing a dianhydride monomer including at least a dianhydride represented by formula (I)

• • wherein R is O or O(CH₂)_nO, n is an integer of 1 to 2 and a diamine monomer represented by formula (II)

H₂N—Ar—NH₂   (II)

wherein Ar is defined as in the text then imidizing the resulting polyamic acid resin to form a polyimide resin. Through using the dianhydride represented by formula (I) as the polymerizing unit, a biphenyl moiety and an ester moiety are introduced into the main chain of the polyimide resin, such that the resulting polyimide resin has lower moisture absorption and smaller linear thermal expansion coefficient and therefore have satisfactory heat resistance and dimensional stability, in addition, become more soluble in organic solvents.

The invention relates to a compound soft board made of polyimide resin and a manufacturing method thereof. In the method, polyamide acid with the coefficient of thermal-expansion (CTE) above 20ppm after cyclization and the polyamide acid with the thermal-expansion coefficient below 20ppm after the cyclization are orderly smeared and arranged on metallic foil, and then the polyamide acid is heated and cyclized to form the polyimide, so that the compound soft board made of the polyimide resin used in printed circuit boards is obtained. The method provided by the invention requires no the adhesion agent for obtaining the compound soft board of polyimide with the outstanding adhesiveness, mechanical property, high heat resistance and high size stability without warping as well.

The invention discloses an environment-friendly high-flame-retarding blended conductive fabric and a manufacturing process thereof, which are in accordance with safety standards for fabrics for air transportation. The environment-friendly high-flame-retarding blended conductive fabric comprises wool blended yarns and an environment-friendly flame retardant, wherein the wool blended yarns comprise wool yarns and non-wool yarns which may be artificial fibers or metal fibers; and the environment-friendly flame retardant comprises phosphates and nitrides and account for 5 to 30 percent of the weight of the environment-friendly high-flame-retarding blended conductive fabric. The manufacturing process comprises a weaving process and a finishing process of the wool blended yarns, wherein the finishing process comprises a step of adding the environment-friendly flame retardant which comprises the phosphates and nitrides and account for 5 to 30 percent of the weight of the wool blended yarns.

The invention discloses an anti-blue-ray radiation curing perfusion glue, which comprises acrylated acrylic resin, a reactive monomer, a radiation curing agent, a blue-ray absorbent, an ultraviolet absorbent and an auxiliary agent, the acrylated acrylic ester resin is acrylated acrylic series resin with or without reactive double bond; the reactive monomer is a mixture of a general monomer and anacrylic resin series reactive monomer with reactive double bond; the radiation curing agent is any one or two of organic phosphine and thioketone radiation curing agents; the auxiliary agent is a defoaming agent. Anti-blue-ray glasses prepared from the anti-blue-ray radiation curing perfusion glue can isolate a relatively large part of harmful ultraviolet and radiation rays, is suitable for viewing a mobile phone, a computer or a television, can greatly reduce the stimulation of harmful short-wave blue rays on eyes, can eliminate acor, fever, pain or other uncomfortable symptoms of the eyes, can relieve eyestrain and harm, and protect our precious eyes.

Polyurethane foam compositions and processes to make flexible polyurethane foams are disclosed. Polyurethane foam is produced in the presence of additives comprising guanidine derivatives. Improvements in physical properties such as air flow, dimensional stability, tensile, tear, elongation and foam hardness is observed when these additives are present in polyurethane formulations. In addition, these additives can minimize polymer degradation under humid ageing conditions resulting in foam products with better mechanical properties.

A method for the manufacture of a three-dimensional object includes the steps of forming a mixture that contains a binder, a wetting agent, and a least one of aluminum or a first aluminum-base alloy into a green composite, removing the binder from said green composite forming a porous preform structure and infiltrating the porous preform structure with a molten second aluminum base alloy to form the three-dimensional object with near theoretical density. The wetting agent assists in wetting during infiltration. The green composite may be formed by an additive process such as computer aided rapid prototyping, for example selective laser sintering. The method facilitates the rapid manufacture of aluminum components by an inexpensive technique that provides high dimensional stability and high density.

A polymer powder having a surface energy of less than 35 mN/m is suitable for melting/sintering powder particles for layer-by-layer production of three-dimensional objects.

The invention discloses a combined ultrathin double-side copper foil substrate and a making method thereof. The combined ultrathin double-side copper foil substrate is formed by a first copper foil layer, a polyimide layer, an adhesion layer and a second copper foil layer, the polyimide layer is arranged between the adhesion layer and the first copper foil layer, and the adhesion layer is arranged between the second copper foil layer and the polyimide layer, wherein the sum of the thicknesses of the polyimide layer and the adhesion layer is 8-25mum. The combined ultrathin double-side copper foil substrate has the advantages of lightness, thinness, high dimension stability, high buckling performance and low rebounding force; and the combined ultrathin double-side copper foil substrate is made through coating or transfer printing and low temperature stitching, so the making method has the advantages of simplicity, high yield and low cost.

The invention provides a continuous laminating method for a composite floor. The method comprises the steps that a base material, a surface plate and a bottom plate are selected and prepared; secondly, point type gluing is conducted on the base material through moisture curing reaction type polyurethane hot melt adhesive; thirdly, blank assembling is conducted, and the surface plate, the base material and the bottom plate are automatically and continuously assembled through accurate surface plate, base material and bottom plate positioning equipment, and are directly and automatically conveyed to enter a continuous press to be subjected to cold pressing; fourthly, continuous normal-temperature pressure applying is conducted; and fifthly, splitting is conducted, a floor blank obtained after cold pressing enters a multiple blade saw unit and is split into floor blank bodies equal in width, wherein a multiple blade saw is a composition unit of the continuous cold press and is arranged after the laminating procedure. The composite floor manufactured through the method has many beneficial effects that the glue spreading amount is small, glue spreading is uniform, the gluing strength is uniform, the inner stress of the floor is small, the size stability is high, free formaldehyde release is avoided, the product quality is high, and the cold pressing period is short; and the production technology is simple, energy consumption is low, the production efficiency is high, and continuous and automatic production can be achieved.

The invention provides a high-strength coal gangue sintered porous brick. The high-strength coal gangue sintered porous brick is prepared from the following components in percentage: 15 to 35 percentof shale, 2 to 10 percent of waste plastic particles, 4 to 7 percent of vermiculite powder, 5 to 10 percent of alkaline mineral slag, 0.5 to 1.8 percent of magnesium borate whisker, and the balance ofcoal gangue, and is also prepared from 0 to 10 percent of modified diatomaceous earth and 0 to 3 percent of a dispersing agent. According to the high-strength coal gangue sintered porous brick, through reasonable proportion of the raw materials, flow coupling among the components is effectively improved, the comprehensive performance is remarkably improved, and the prepared product has the compressive strength of greater than 28.4 MPa and the porosity of greater than 35 percent; industrial waste is fully utilized; and the high-strength coal gangue sintered porous brick is environment-friendly, economical and high in economic benefit, and is suitable for industrial popularization.

The invention discloses a composite-structure copper foil substrate and a making method thereof. The composite-structure copper foil substrate is formed by a copper foil layer, a black polymer layer, a black adhesion layer and a black strengthening layer, wherein the black polymer layer is arranged between the copper foil layer and the black adhesion layer, the black adhesion layer is arranged between the black polymer layer and the black strengthening layer, and the sum of the thicknesses of the black polymer layer and the black adhesion layer is 5-50mum. The composite-structure copper foil substrate is made through a simple method, and the thicknesses of the black adhesion layer and the black polymer layer can be adjusted according to the demands of FPC downstream factories to satisfy the demands of FPC clients, so the composite-structure copper foil substrate accords the demands of high dimensional stability, high stiffness and workability, and is especially suitable for relevant electronic products of mobile phone antenna plates and the like.

The invention discloses a composite high-frequency substrate with the characteristics of high Dk and low Df. The high-frequency substrate comprises a first copper foil layer and a core layer; the corelayer comprises a plurality of high-molecular polymer film layers and a plurality of dielectric adhesive layers; the dielectric adhesive layer comprises at least one of a first dielectric adhesive layer and a second dielectric adhesive layer; the first dielectric adhesive layer is an adhesive layer with a Dk value of 6-30 and a Df value of 0.002-0.020, the second dielectric adhesive layer is an adhesive layer with a Dk value of 15-100 and a Df value of 0.002-0.020, and the Dk value of the second dielectric adhesive layer is greater than the Dk value of the first dielectric adhesive layer; andthe core layer refers to a core layer with a Dk value of 6-50 and a Df value of 0.002-0.020. The laser drilling technology is better, the inward shrinkage condition is not likely to happen, the hygroscopicity is low, the insulativity is high, the size stability is high, the thermal stability is excellent, and the high Dk and low Df electrical property is better; normal press fit parameters can beused for being matched with quick press equipment or pressure transmission equipment, the cost advantage is achieved, and the thick film manufacturing technology is achieved.

An electronic dosing drive comprising a support structure, a threaded spindle with an external thread for driving a plunger, at least one first guide element is firmly connected, and is guided parallel to the threaded spindle on a second guide element, a spindle nut having an internal thread is engaged with the external thread of the threaded spindle, an electric drive motor having a motor shaft is coupled with the spindle nut and is attached to the support structure, an electric control apparatus is connected to the electric drive motor, where the external thread of the threaded spindle has multiple threaded areas that are separated from each other by first flattenings on their circumference extending in the longitudinal direction, and the first flattenings have guide areas that abut the core diameter of the internal thread of the spindle nut.

Dental cement composition comprising (i) a particulate filler reactive with a polyacid in a cement reaction; (ii) a water-soluble polymerizable compound of the following formula (1), AXn (1) wherein A is a linker group containing at least n nitrogen atoms and optionally one or more acidic groups, X are moieties containing a polymerizable double bond and forming an amide bond with a nitrogen atom of A, which X may be the same or different and are represented by the following formula (2) wherein R¹ and R² are independent from each other and represent a hydrogen atom, a C_1-6 alkyl group or a group —(CH₂)_m—Z, wherein Z is COOM, OPO₃M₂, PO₃M₂, SO₃M, and M is independently a hydrogen atom or a metal atom, and m is an integer of from 0 to 6, L is a bond or a C_1-6 alkylene group; and n is an integer of at least 1; provided that at least one X cannot be a (meth)acryl group; and (iii) an initiator system; optionally a polyacidic polymer having polymerizable double bonds; and optionally water.

The invention discloses a preparation method for polyamide acid resin and a preparation method for a double-sided flexible copper-clad plate. The preparation method for the polyamide acid resin is asfollows: under the protection of nitrogen, aromatic diamine monomer is dissolved into an aprotic polar solvent, and after stirring for dissolution at 25 DEG C to 50 DEG C, an aromatic diamine monomersolution with the mass concentration of 6 to 9 percent is obtained; after being cooled to 0 DEG C to 25 DEG C, the aromatic diamine monomer solution is added with an aromatic dianhydride monomer, wherein the molar ratio of the aromatic diamine monomer to the aromatic dianhydride monomer is (1:0.95) to (1:1.05), and after 6 to 10 hours of polymerization reaction, standing for defoaming is carried out, so that the polyamide acid resin is obtained. The invention further discloses the method for preparing the double-sided flexible copper-clad plate by utilizing the polyamide acid resin. Accordingto the invention, the reaction for preparing the polyamide acid resin is simple and controllable, and the polyamide acid resin has excellent heat resistance and chemical resistance; and the prepared double-sided flexible copper-clad plate has good heat resistance, high dimensional stability and excellent chemical resistance, and properties such as peel strength and elongation are excellent.

The pipe structure according to the present invention includes: a fiber-reinforced plastic pipe 5; moisture-proof foils 11, 12 which individually cover an outer circumferential surface of the pipe 5 and an inner circumferential surface thereof; and an intermediate part 4 which is made of metal and fitted to an end of the pipe 5, wherein end portions of the moisture-proof foils 11, 12 are tightly sandwiched between the pipe 5 and the intermediate part 4. This configuration reliably prevents an FRP pipe from absorbing moisture, and thus, prevents the FRP pipe from shrinking due to moisture exhaustion in outer space, whereby it is possible to obtain the pipe structure having excellent dimensional stability.

Disclosed is a light diffusion plate for use in a backlight unit of a liquid crystal display or an illumination apparatus, which includes polycarbonate resin or polystyrene resin as a base resin, so that appropriate brightness and high hiding properties or appropriate hiding properties and high brightness are exhibited, and thus, while minimizing the use of additional optical films, brightness is sufficiently high, therefore maintaining good light emission quality. The diffusion plate has high ability to hide a light source, is inexpensively manufactured, and has high dimensional stability, so that no curling occurs even under high-temperature and high-humidity conditions, leading to excellent light properties.

A composite sheet and a manufacturing process for producing a decorative sheet using the composite sheet are provided. The composite sheet has a base layer and a foamable layer bonded to the base layer. The foamable layer includes 100 parts by weight of a polyolefin material having an elastic modulus of <0.1 GPa, 0.1-10 parts by weight of a foaming agent, and 0-200 parts by weight of additives. The foamable layer has a thickness of 0.05 to 0.3 mm.