491 results about "Thermal contraction" patented technology

According to this liquid crystal cell, a vacuum to be established between two electrode substrates as a result of the volume shrinkage of a liquid crystal having a high viscosity at the room temperature can be damped by communicating between two of a plurality of filling portions formed between two electrode substrates by a plurality of barrier walls through the intervening barrier walls. An anti-ferroelectric liquid crystal (AFLC) is used as the liquid crystal. The liquid crystal cell has a lower electrode substrate and an upper electrode substrate, between which a smectic liquid crystal is disposed together with a plurality of barrier walls on the inner side of a band seal. Each barrier wall has through holes to communicate between the two filling portions located on the two sides of the barrier walls.

A dicing sheet with a protective film forming layer has a substrate film, an adhesive layer, and a protective film forming layer, and at a minimum, the adhesive layer is formed in an area surrounding the protective film forming layer in a planar view, and the substrate film has the following characteristics (a)-(c): (a) the melting point either exceeds 130° C. or the film has no melting point; (b) the thermal contraction rate under conditions of heating at 130° C. for two hours is from −5 to +5%, and (c) the degree of elongation-to-break in the MD direction and the CD direction is at least 100%, and the stress at 25% is no more than 100 MPa.

A heat-resisting ultrafine fibrous separator of the present invention is prepared by an electrospinning process, formed of ultrafine fibers of heat-resisting polymer resin having a melting point more than 1800 C or not having the melting point, or ultrafine fibers of polymer resin capable of swelling in an electrolyte, together with the ultrafine fibers of heat-resisting polymer resin. Also, polyolefine fine particles providing a shutdown function are dispersed in the heat-resisting resin or the polymer resin capable of swelling in the electrolyte. The heat-resisting ultrafine fibrous separator of the present invention has the shutdown function, low thermal contraction, thermal endurance, excellent ionic conductivity and excellent adhesive property with an electrode, so a battery having excellent cycling characteristics, and having high-energy density and high capacity can be prepared.

The invention discloses a three-layer coextrusion heat shrinkage resin film, a production method and an application method. The-three layer coextrusion heat shrinkage resin film is produced by taking PE(LDPE, HPPE, LLDPE, mPE), EVA, PP, PA and EVOH resins as the main materials which are matched with a functional master batch and adopting a production method of one-step huffing. The largest transverse and longitudinal shrinking rates of the product can reach 60 percent and 85 percent; the largest shrinking force of the product can reach 2.0N/cm. The shrinking rate and the shrinking force of the product can be controlled and adjusted by controlling various technical parameters to lead a package to be firm and endurable. The packaged objects are pertinently led to reach the anti-rust, anti static, illumination-resistance, anti-aging, anti-puncturing, anti-low-temperature, anti-isolation, anti-bacteria and anti-degradation effects and the like by adjusting the material composition and mixture ratio of each layer. The three-layer coextrusion heat shrinkage resin film is used for replacing the traditional paper box wrappage to reduce the packaging cost. The mechanical properties are good, the pertinence is strong, the materials are saved; when the three-layer coextrusion heat shrinkage resin film is used, the shrinking temperature is low, the power is saved and the packaging cost is saved, thus effectively reducing the production cost and having extremely high application value.

A method of compensating for thermal contraction of superconducting and cryo-resistive cables. The method includes the steps of determining a compensation length for a cable such that when the cable is subjected to an operating temperature, the cable is in or near a stress-free state, and installing the cable into a pipe such that portions of the cable extend outwardly past ends of the pipe. The method further includes the steps of marking each end of the cable such that the determined compensation length is visibly shown, forcing the cable into the pipe at an ambient installation temperature such that a cable pattern is formed therein, and maintaining the cable in the pipe to prevent the cable from being pushed out of the pipe.

The invention provides a bittern-free flame-proof thermal contraction sleeve which comprises (by weight ratio), (1) 100 parts of one or more selected from ethane-vinyl acetate copolymer (EVA), ethene-ethyl acrylate copolymer (EEA), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), (2) 5-50 parts of one or more selected from ethylene-propylene terpolymerisate rubber (EPDM), ethylene propylene rubber (EPM), dimethyl silicone rubber (MQ), methylvinyl silicone rubber (VMQ), methylsilicone rubber with phenyl and vinyl Group (PVMQ), thermoplastic elastomer styrene - butadiene - styrene blocked copolymer (SBS), styrene-isoprene blocked copolymer (SIS), (3) 50-100 parts of bittern-free flame retardant, and (4) 0.5-6 parts of coupling agent.

An image sensor and a manufacturing method thereof are provided, so that the warp or the distortion is not caused even if there is the thermal expansion difference or the thermal contraction difference in the longitudinal direction between the linear illuminating device and the frame. The image sensor comprises a linear illuminating device for illuminating an original; a light-receiving element array for receiving reflected light from the original; a lens array for focusing the original on the light-receiving element array; a frame for containing the linear illuminating device, the lens array, and the light-receiving element array; and a resilient retaining portion for pressing the linear illuminating device, which is mounted in the frame, into the frame.

Dual-walled piping segments and pipelines are described that use an annular bulkhead to secure the jacket pipe radially outside of the carrier pipe near the axial ends of the piping segment. Pup joints are welded to each end of the carrier pipe, and the bulkheads are welded to the pup joints. The bulkheads have a number of features that provide improved load path control for axial forces induced by temperature differentials. There is a mechanical load-sharing interlock mechanism provided between the bulkhead and the interior pup joint and field joint closure joints designed to transmit stress loading to a plurality of ridges or threads, that may be enhanced by thermal contraction, and preclude axial movement between the jacket pipe and pup joint. A number of methods are described for creating the load-sharing interlock. Additionally, the bulkhead has a generally arcuate cross-section that defines an interior channel. The arcuate cross-section allows the bulkhead to be somewhat flexible to absorb axial and radial loading while reducing the available heat transfer rate. The bulkhead also contains several ports for pressure equalization and plugged ports for the pressure-thermal-chemical conditioning of the annular spaces.

A multi purpose interconnect assembly between upper and lower helium vessels in a recondensing superconducting magnet to provide isothermal connections to extend the ride-through period, and to provide for helium liquid and gas passage, electrical interconnections, and to accommodate differential thermal contraction and expansion.

A thermal anti-oxidation radiation resistance polyolefine thermal contraction material, comprising the following components by weight part: linear low density polyethylene 100-150 part, ethylene copolymer 30-80 part, polyolefine elastomer 20-40 part, cross-link sensibilizer 1-3 part, composite antioxidant 1-10 part, light stabilizer 1-5 part, halogen-containing fire retardant 20-60 part and antimony trioxide 10-30 part. The material is not only used in the nuclear island of the nuclear power station, but also widely used in the fields with higher material performance requirement such as navigation, shipping, nuclear submarine or the like.

A servo or control technique and apparatus for an external cavity diode laser (ECDL) are described. Coarse tuning adjustments for the ECDL may be performed by varying the temperature of tunable filters. Fine tuning adjustments may be performed varying the temperature of the ECDL sled (base) to vary the length of the cavity via thermal contraction and expansion. A controller comprises a coupler matrix that mathematically relates multiple control signal inputs for varying the temperatures of the tunable filters and sled to produce multiple outputs used to control, for example, thermal-electric cooler (TEC) elements associated with the tunable filters and sled.

The invention provides a cellulose/polymer fiber composite material for a lithium secondary battery and a preparation method thereof. The composite material is prepared by papermaking structural fibers of celluloses and superfine polymer fibers through a wet paper making technology, wherein the celluloses are obtained by beating cellulose raw materials of a wood pulp or a jute pulp, a cotton pulp and the like and have microfibrillar structures. The composite material prepared through the preparation method of the invention has the characteristics of small thermal contraction, high thermal stability and good mechanical performance and can satisfy diaphragm requirements of a nonaqueous electrolyte energy storage device; and additionally, the composite material which partially adopts renewable celluloses as the raw material has the advantages of low cost, simple process and environmental protection.

The invention discloses polyester with an extensive amorphous region. The components of terephthalic acid, m-phthalic acid and dihydric alcohol and a dihydroxy compound with an ether bond are used as basic raw materials, an acid component contains 10-30 percent by mol of m-phthalic acid and 70-90 percent by mol of terephthalic acid, total acid and total alcohol are prepared into uniform slurry inthe mol ratio of 1.05:2.0, and the polyester which does not have an obvious melting peak under a DSC (differential scanning calorimetry) and has the extensive amorphous region and low melting point is generated by the reactions of esterification and polycondensation. The method can utilize a traditional semicontinuous and continuous polyester production line to realize industrialized production. The polyester produced by utilizing the method provided by the invention is used for preparing a packaging film, a sheet, a hot melt adhesive and the like. The invention is especially suitable for being prepared into a thermal contraction film used for a packaging purpose or a tag purpose so as to replace a polyvinyl chloride (PVC) thermal contraction film used in the market at present.

The invention provides a novel automatic packing system and a novel automatic packing method applied for electronic commerce and express delivery logistics industry. The packing system and the packing method are mainly provided for packing of paper boxes in electronic commerce and express delivery logistics industry. The packing system comprises a material conveyer belt, an industrial personal computer, a printer, a PLC, an infrared sensor, a film cutting machine, a sealing machine, a hot wind box, a cooling mechanism and a list pasting mechanism. The automatic packing method comprises steps of using transparent PE films as packing materials; scanning codes of paper boxes; matching information; sealing and packing four edges of each of the paper box; and performing thermal contraction, cooling and list pasting processes. Thus, automatic packing of the paper boxes is finished.

The present invention belongs to the field of textile measuring instrument, and is one kind image test method and apparatus for the heat shrinkage of chemical fiber. The measuring method includes taking images of single fiber samples hung to cylindrical frame with CCD camera to obtain the length change before and after heating, and calculating in computer the heat shrinkage of chemical fiber. The measuring apparatus includes stepped motor, turntable, positioning pin, sample cylinder, elevator, metering calibration block, upper spring clamp, lower tensile clamp, holding circular ring, CCD camera, pulse distributor, casing, computer, display and printer. The present invention has the advantages of reliable test result, high precision, simple instrument structure and low fault rate.

The invention relates to a slurry composition and a lithium ion battery diaphragm containing the same. The slurry composition contains inorganic micro-particles, a water soluble polymer, non-water soluble organic micro-particles and water, wherein the water soluble polymer is used as a dispersant and is uniformly adsorbed on the surface of the inorganic micro-particles, so that the inorganic micro-particles are uniformly and stably dispersed in water, and an aqueous dispersion liquid of the inorganic micro-particles is obtained; the non-water soluble organic micro-particles have a core-shell structure, and the non-water soluble polymer as a core-layer material is uniformly dispersed in water due to the presence of a shell-layer material; the aqueous dispersion liquid of the inorganic micro-particles and the non-water soluble organic micro-particles are mixed uniformly, and the prepared slurry composition is used in the lithium ion battery diaphragm; through coating modification of the diaphragm, the heat resistant performance of the lithium ion battery diaphragm is improved, safety problems such as short circuit caused by thermal contraction of the diaphragm are reduced, and the reliability of a lithium ion battery is improved significantly.

The invention relates to a double bubble blow-molding film molding method of polyester heat-shrinkable film, belonging to the processing field of polymer materials. Polyester material is fed into a single-screw extrusion machine to carry out plasticizing extrusion after being dried, and a first film bubble is obtained after being blew by a blowing mould ram head, the first bubble is formed into a first bubble double-bending film through a first gable and a first pull roll, and secondary blowing is carried out to obtain a second film bubble for quenching molding after secondary heating is carried out to be in elastomeric state between Tg and Tf (Tg being a vitrification temperature, and Tf being a fusion temperature) through a second pull roll and a heating device, a second bubble double-blending film is formed through a second gable and a third pull roll and lastly taken up to obtain the polyester heat-shrinkable film. Compared with the existing flat film stretching method, the invention has the characteristics of small equipment investment, easy regulation for product standard and strong flexibility, and is applied to heat-shrinkable extension type label or goods package of containers.

The invention discloses a polyester thermal contraction film with balanced thermal contraction performance and production method thereof, the film is of three-layer construction: a top layer, a core layer and a bottom layer, wherein the component of the core layer is polyethylene terephthalate; the top layer and the bottom layer comprise parent material 15-25% wt and copolymerized modified polyester. The vertical, horizontal thermal contractions of the film are balanced and the vertical thermal contraction is about 65% and the horizontal thermal contraction is about 70% at 90-100DEG C; the vertical, horizontal tensile strengths are 240-260MPa. The process is mature with very strong operability, especially suitable for two-step tensile polyester film production line.

The invention discloses production equipment and process for a large-diameter biaxial-stretching PVC pipe fitting. The equipment mainly comprises a tapered double-screw extruder, an extruder head, a vacuum sizing device A, a first traction device, a reheating device, a stretching and diameter expanding molding device, a vacuum sizing device B and a second traction device which are sequentially and linearly arrayed to form a production line; the stretching and diameter expanding molding device is composed of an inflation rod, an expansion bag, an expansion sizing mould and a shaping bag; each of the expansion bag and the shaping bag is of an annular bag-shaped structure; the expansion bag is continuously expanded and retracted under the action of the inflation rod; a pipe fitting to be expanded moves by a certain distance through the action of an outer ring circular-arc surface of the expansion bag when the expansion bag is expanded once, so that each point of the pipe fitting can be subjected to annular expansion; the stretching is generated in the axial direction of the pipe fitting through a stretching ratio between the first traction device and the second traction device. By adopting the production equipment and process, the continuous production of the diameter-expanded pipe fitting is successfully realized, the thermal contraction of the pipe fitting is small and the axial mechanical property can be enhanced.