1009 results about "Thermal shrinkage" patented technology

The invention relates to an antistatic PET (Polyethylene Terephthalate) base film for preparing a polaroid release film and a preparation method thereof, the release film base film is prepared by taking an optical-grade PET slice as a main body, adding modified PET with a specific structure and a modified SiO2 filler, and carrying out co-extrusion casting, a unique three-section stretching process and coating with a coating liquid. According to the invention, material modification and process improvement are carried out, specifically, an optical-grade PET slice is taken as a main body material, modified PET and a modified SiO2 filler with a specific structure are added, a film is prepared through co-extrusion casting and a unique three-section stretching process, and then the surface of the film is coated with a layer of antistatic coating liquid, so that the antistatic film is obtained. The finally prepared base film has low alignment angle, low transverse hot shrinkage rate and high surface adhesion, keeps the characteristics of high light transmittance and low haze of an optical-grade polyester film, endows the film with certain antistatic property, and is particularly suitable for being used as a release film of a high-end polaroid.

The invention discloses a dry-process high-temperature-resistant lithium battery diaphragm and a preparation method thereof, and relates to the technical field of lithium battery diaphragms. The specific preparation method comprises the following steps: activating and cross-linking polypropylene, polyimide, a PP-b-PI block copolymer and a cross-linking agent BIBP under the protection of nitrogen to prepare a polypropylene-polyimide matrix; after melting, adding a pre-sintered ZrO2-coated Al2O3 core-shell filler, hydroxylated boron nitride and zinc borate, and carrying out double-stage screw extrusion, ultrasonic orientation, nitrogen annealing and cold roller quenching to obtain a mixed melt; carrying out warm stretching and hot air circulation heat treatment to prepare a hard elastic crystal base film; carrying out stretching, thermal relaxation and thermal shaping to obtain a microporous base membrane; after slitting, plasma activation is carried out, epoxy silane and tetraethyl orthosilicate / polybenzimidazole aerogel precursors are sprayed, and a nano closed-pore coating is formed through pre-curing and heat shrinkage curing; and finally eliminating static electricity and rolling to obtain a finished product. The lithium battery diaphragm prepared by the invention is excellent in high temperature resistance and low in thermal shrinkage rate.

The invention discloses a 110kV high-voltage polypropylene power cable, and relates to the technical field of power cables, and the 110kV high-voltage polypropylene power cable comprises an outer sheath, a conductor is installed in the outer sheath, the conductor is sleeved with a cable core sleeve, a shielding sleeve is embedded in the outer wall of the cable core sleeve, an inner spacer bush is installed on the inner side of the outer sheath, and an outer spacer bush is installed on the outer side of the inner spacer bush. According to the invention, bidirectional limiting and locking protection of the inside and the outside of the cable can be realized, multiple supports are provided for the inside of the cable, the internal stress stability of the cable in the use process is effectively balanced, and the service life of the cable is prolonged. The interface compatibility among the structures in the cable is equivalently improved, the interface air gap generated by the thermal shrinkage of polypropylene is effectively compensated, the double restraint of water branches and electric branches is realized, the multiple optimization of the mechanical performance is structurally realized, the stability of the electric insulation performance is improved, and the effective service life of the cable is prolonged.

A 3-D honeycomb textile can include a textured yarn. The textile can exhibit a heat-shrinkage rate from about 10% to about 60%. The textile can be configured to reversibly change its dimensions under application of stress. Prosthetic valves can have the disclosed textiles as a sealing member. Additionally, prosthetic valves can the disclosed textiles as cushion materials. In addition, methods of making the disclosed textiles and prosthetic valves are described.

The invention provides a battery and an electric device. A positive plate comprises a positive active material, and the positive active material is doped and / or coated with a lanthanum element; the surface of the diaphragm is coated with a ceramic coating; the electrolyte comprises a first solvent, a second solvent, a first additive and a second additive; the first solvent comprises a cyclic carbonate compound, the second solvent comprises a chain fluorosulfonamide compound, the first additive comprises mannitol carbonate sulfate, and the second additive comprises succinonitrile; the lanthanum element is doped / coated on the positive active material, so that the release of lattice oxygen at high voltage or high temperature can be effectively inhibited, and the exothermic reaction activity at the thermal runaway initial temperature is reduced; the first additive and the second additive in the electrolyte respectively form a compact CEI film and an SEI film with high thermal stability on the surfaces of the positive electrode and the negative electrode; the diaphragm ceramic coating provides a physical barrier, the thermal shrinkage temperature of the diaphragm is increased, and internal short circuit is prevented.

The invention discloses a laser die-cutting machine capable of cutting an elastic film, and relates to the field of laser die-cutting machines, the laser die-cutting machine comprises a case, a first moving table capable of transversely and vertically moving and a second moving table capable of longitudinally moving are arranged in the case, a mounting frame is fixed on the first moving table, and a laser cutting head is arranged at the bottom end of the mounting frame; a fixing base coaxial with the laser cutting head is arranged at the bottom end of the mounting frame, and the bottom end of the fixing base is connected with an air blowing box and an air suction box which are oppositely arranged. When the stainless steel plate with the single face coated with the film is cut, high-power laser can be directly used for cutting the stainless steel plate at a time, high-speed airflow synchronously blown out by the air cooling mechanism can effectively restrain heat shrinkage of the elastic film caused by high temperature, material deformation and irregular edge cutting are avoided, the machining efficiency is remarkably improved while the high-power laser penetrates through the stainless steel plate, and the production cost is reduced. Repeated positioning errors and operation cost of equipment are reduced, and integrated efficient precision machining of the film-coated metal plate is achieved.

The invention discloses a cross-linking type biodegradable POF heat shrink film and a preparation method thereof, and belongs to the technical field of heat shrink films, and the cross-linking type biodegradable POF heat shrink film is characterized by comprising three layers of films which are sequentially attached, each of the first-layer film and the third-layer film comprises the following raw materials in percentage by weight: 89.5-94% of PP, 2-6% of degradable master batch, 0.5-3% of an anti-blocking agent and 1-4% of a slipping agent; the second-layer film is prepared from the following raw materials in percentage by weight: 30 to 35 percent of LLDPE-A, 9 to 14.5 percent of toughening agent, 0.5 to 1 percent of degradable master batch, 40 to 45 percent of LLDPE-B and 10 to 15 percent of metallocene LLDPE; the melt index of the LLDPE-A is 2.5 g / 10min, the melt index of the LLDPE-B is 2.1 g / 10min, the melt index of the metallocene LLDPE is 1.0 g / 10min, and through the synergistic effect between the LLDPE with different melt indexes and the flexibilizer, the low-temperature tear resistance of the heat shrink film is effectively improved.

The invention relates to the technical field of battery materials, in particular to a para-aramid lithium battery diaphragm and a preparation method thereof. The para-aramid lithium battery diaphragm comprises para-aramid slurry and a base membrane, the para-aramid slurry is coated on the two sides of the base membrane to form para-aramid coatings, and the para-aramid slurry comprises the following raw materials in parts by weight: 20-40 parts of modified para-aramid polymer liquid, 10-20 parts of nano ceramic composite material powder and 10-18 parts of a solvent; the nano ceramic composite material powder is prepared from the following raw materials in parts by weight: 50 to 100 parts of nano aluminum oxide, 8 to 12 parts of nano zirconium dioxide, 0.3 to 0.8 part of yttrium oxide, 1 to 5 parts of magnesium nitrate hexahydrate, 0.1 to 1 part of polyacrylic acid, 1 to 2 parts of ammonia water, 1 to 3 parts of coupling agent and 20 to 30 parts of silicon dioxide; the nano ceramic composite material powder is added into the para-aramid slurry, so that the para-aramid diaphragm has better thermal stability, and the phenomenon of thermal shrinkage of the diaphragm at high temperature is reduced.

The application discloses a high-performance separator coating for lithium battery positive electrodes and a processing method thereof, and belongs to the technical field of lithium battery materials, aiming to solve the problems of weak inhibition of polysulfides, difficult balance between ion transmission and blocking, poor high-temperature stability and low processing efficiency of the existing separator coating. The separator coating is composed of a composite sulfur carrier, a conductive additive, a functional adhesive and a thermal stability enhancer, adopts a double-layer gradient structure with a low-porosity dense barrier in the inner layer and a high-porosity high-efficiency lithium transmission in the outer layer, and its processing method comprises composite sulfur carrier preparation, double-station alternating coating, gradient temperature vacuum drying and low-temperature plasma activation. The application realizes triple synergy of physical adsorption, chemical anchoring and catalytic conversion, so that the capacity retention rate of lithium-sulfur batteries after multiple cycles still reaches a high level, the thermal shrinkage rate of the coating is low, the product qualified rate is improved, and the application is suitable for high-energy-density lithium-sulfur batteries and high-nickel ternary lithium batteries, and meets the long-cycle and high-safety requirements.

The application relates to the technical field of batteries, in particular to a high-safety separator for new energy batteries and a preparation method thereof. The separator is composed of a polyethylene microporous base film and a double-sided composite coating, and the coating contains core-shell nano-aluminum oxide and a polyvinylidene fluoride copolymer binder. The interface enhancement effect of the core-shell nanoparticles makes the separator have a lower thermal shrinkage rate at high temperatures, and the puncture strength is increased to above 430 N / mm. The application solves the contradiction between the thermal stability and the ion conduction performance of the traditional separator, and is particularly suitable for a high-energy-density power battery system, and effectively improves the battery safety and the cycle life.

The invention relates to the technical field of building materials, and provides high-crack-resistance concrete based on sheath temperature shrinkage-core material phase change composite fibers and a preparation method of the high-crack-resistance concrete. The composite fiber is of a core-shell structure, and a core material is formed by loading an organic or inorganic phase change material on a porous metal fiber; the material of the sheath layer comprises one or more of polyester, polypropylene, polyurethane and high-density polyethylene; and the sheath layer is thermally shrunk through thermal treatment and coats the core material. According to the concrete disclosed by the invention, by introducing the sheath temperature shrinkage-core material phase change composite fiber, not only is a temperature field actively regulated and controlled by utilizing phase change latent heat, but also beneficial pre-compressive stress is introduced into the concrete through the temperature shrinkage effect of the fiber sheath; therefore, the crack resistance of the concrete is synergistically improved from multiple dimensions of stress source control, concrete inner surface temperature difference reduction and matrix enhancement, and it is guaranteed that the mechanical property of the concrete is not remarkably reduced due to introduction of the PCM.

The present invention relates to a heat-shrinkable polyester film that exhibits a low value of shrink stress like Polyvinyl chloride resin film. Namely, the provided is a polyester heat-shrinkable film obtained from multiple amorphous polyester resins or the like that are reaction products of a polyvalent carboxylic acid and both a first polyalcohol having an alicyclic structure and a second polyalcohol not having an alicyclic structure, wherein the thermal shrink stress at 85° C. is below 6.8 MPa.

The invention discloses a device and method for testing the thermal shrinkage rate of a diaphragm, and the method comprises the steps: S1, cutting a diaphragm into a preset size in advance, and placing the diaphragm on a lower loading plate according to the position of a reference line; s2, a dyeing auxiliary plate is placed, and a dyeing agent is used for dyeing; s3, taking down the dyeing auxiliary plate and horizontally placing an upper pressing plate; s4, applying a preset pressure, simulating the stress condition of the diaphragm in the battery cell, maintaining a constant pressure, assembling the bolt, and fixing a torque; s5, placing in a temperature control box, heating to a preset temperature, and standing; s6, the camera captures and records changes of multiple groups of region areas and relative positions of diaphragm dyeing along with time, and the total shrinkage rate and the shrinkage rates of different dyeing regions are calculated respectively; and S7, collecting the real-time shrinkage rates of multiple groups of positions of the diaphragm at different temperatures, judging whether the local shrinkage rates of the whole diaphragm and each region are qualified or not, and providing reference for subsequent adjustment of a coating formula.

The invention discloses a wire harness full-automatic pipe penetrating thermal shrinkage machine which comprises a machine frame, a horizontally-arranged workbench is arranged at the upper end of the machine frame, a discharging conveying belt arranged in the axial direction of the Y axis is arranged on the left side of the workbench, and a pipe penetrating thermal shrinkage mechanism arranged in the axial direction of the Y axis is arranged at the upper end of the workbench. A wire feeding mechanism is arranged on the left side of the pipe penetrating thermal shrinkage mechanism, and a pipe cutting and feeding mechanism is arranged on the right side of the pipe penetrating thermal shrinkage mechanism; the device has the advantages that the design is novel, the structure is compact, the automation degree is high, the 5-1500mm heat shrinkable tube can be automatically cut, the electronic wire and the wire harness can automatically penetrate through the tube at any length, meanwhile, the heat shrinkable tube is accurately positioned, and the production rate and the product percent of pass are greatly improved.

The invention discloses ultra-high molecular weight polyethylene composite stab-resistant cloth and a preparation method and application thereof, and relates to the technical field of stab-resistant cloth, and the preparation method comprises the following steps: S1, preparing a binder solution; and S2, dipping the ultra-high molecular weight polyethylene non-woven fabric in the binder solution, taking out the ultra-high molecular weight polyethylene non-woven fabric, coating the surface of the base fabric with a layer of dispersion liquid containing negative expansion nanoparticles, and drying the base fabric to obtain the composite base fabric. The negative expansion layer is formed on the base cloth, so that the negative expansion layer is more compact during hot pressing or can be more tightly filled between the non-woven cloth, the porosity of the base cloth is reduced, larger resistance is formed, and the puncture-proof effect of the base cloth is greatly improved; meanwhile, the polyisoprene fibers with thermal shrinkage and cold expansion are further added, the toughness of the coating is improved, a complex network structure can be formed by the polyisoprene fibers and the nano-particles, certain space resistance can also be formed, and the puncture-proof effect is improved.

The invention discloses a lithium battery positive electrode high-performance diaphragm coating and a processing method, belongs to the technical field of lithium battery materials, and aims to solve the problems of weak polysulfide shuttling inhibition, difficulty in balancing ion transmission and barrier properties, poor high-temperature stability and low processing efficiency of an existing diaphragm coating. The diaphragm coating consists of a composite sulfur carrier, a conductive additive, a functional adhesive and a thermal stability enhancer, and adopts a double-layer gradient structure with low porosity of an inner layer for compact blocking and high porosity of an outer layer for efficient lithium transmission; the processing method comprises the steps of preparation of the composite sulfur carrier, double-station alternate coating, gradient heating vacuum drying and low-temperature plasma activation. According to the invention, triple synergy of physical adsorption, chemical anchoring and catalytic conversion is realized, so that the capacity retention ratio of the lithium-sulfur battery after multiple cycles still reaches a relatively high level, the thermal shrinkage rate of the coating is relatively low, the product percent of pass is improved, and the method is suitable for high-energy-density lithium-sulfur batteries and high-nickel ternary lithium batteries, and meets the requirements of long cycle and high safety.

The utility model relates to the technical field of photovoltaic packaging, and discloses a composite polyester backboard and a flexible photovoltaic assembly. The composite polyester backboard comprises a first base film and a second base film which are sequentially laminated from bottom to top, an outer weather-proof coating is arranged on the lower surface of the first base film, an inner bonding layer is arranged on the upper surface of the second base film, and the inner bonding layer is bonded on the lower surface of a photovoltaic cell; a composite adhesive layer is arranged between the first base film and the second base film; the first base film and the second base film are polyester base films, and the composite adhesive layer is an epoxy acrylic adhesive layer. The composite polyester backboard has the advantages of high strength, weather resistance, aging resistance, good cohesiveness with a packaging adhesive film, small thermal shrinkage and low production cost, avoids the problem of edge warping of the flexible photovoltaic module, reduces the power attenuation of the flexible photovoltaic module after a hail test, and is helpful for improving the packaging reliability and long-term power generation power of the flexible photovoltaic module.

The invention discloses a high-temperature-resistant high-toughness high-transparency PE heat-shrinkable film and a preparation method thereof, and relates to the field of PE heat-shrinkable films, and aims to solve the problems of poor high-temperature resistance, poor film toughness and poor transparency in the prior art, the adopted technical scheme is as follows: the high-temperature-resistant high-toughness high-transparency PE heat-shrinkable film comprises a layer A, a layer B and a layer C, the three layers are connected in sequence, the layer A comprises LDPE, HDPE, MLLDPE, PMP, OBC and PPA, and the layer B comprises LDPE, HDPE, MLLDPE, PMP, OBC and PPA; the layer B comprises LDPE (Low-Density Polyethylene), LLDPE (Linear Low-Density Polyethylene), HDPE (High- And the layer C comprises LDPE, MLLDPE, HDPE, POE, a slipping agent, a toughening agent and a coupling agent. The temperature resistance range, the toughness and the transparency of the PE heat shrink film are greatly improved, the problem that the PE heat shrink film is unstable in the using process is solved, the production efficiency of a user is greatly improved, the cost is saved, and the PE heat shrink film can be used for bundling packaging of beer, beverages, dairy products and the like.

The invention relates to a low-alignment-angle high-heat-resistance release film base film for a polaroid and a preparation method thereof, and the release film base film is prepared by taking an optical-grade PET slice as a main body material, adding modified PET and modified SiO2 filler with a specific structure, and carrying out co-extrusion casting and a unique three-section stretching process. According to the modified PET, a 2-(pyridine-3-yl) terephthalic acid comonomer and ionic liquid intercalated montmorillonite are introduced, so that the rigidity and heat resistance of a molecular chain are improved, and a heterogeneous nucleation point is provided; the surface of the modified SiO2 filler is grafted with a terpolymer, so that good compatibility with a matrix and internal lubrication are realized; according to the preparation method, a transverse-longitudinal-transverse three-section stretching sequence and step-by-step increasing temperature control are adopted to cooperatively regulate and control orientation and crystallization of molecular chains; and finally, the optical-grade polyester film with low alignment angle, low transverse thermal shrinkage rate and high surface adhesion is prepared, and is particularly suitable for being used as a release film of a high-end polaroid.

The invention provides a lithium ion battery composite membrane with high safety and high ionic conductivity and a preparation method thereof.The lithium ion battery composite membrane comprises a base membrane and a functional coating compounded on the surface of at least one side of the base membrane, and the functional coating comprises, by weight, 60-85% of a high-temperature-resistant polymer matrix, 1-5% of a binder, 1-5% of an antioxidant and 1-5% of a lubricant. And 15-40% of sulfobetaine functionalized inorganic nanoparticles. The high-temperature-resistant polymer matrix and the sulfobetaine functionalized inorganic nanoparticles form a synergistic effect, so that the high-temperature thermal shrinkage of the diaphragm can be effectively inhibited, the short-circuit risk of the battery caused by diaphragm melting can be greatly reduced, and the use reliability is improved. Meanwhile, the zwitterionic groups on the surfaces of the sulfobetaine functionalized inorganic nanoparticles are extremely high in hydrophilicity, so that the infiltration speed of the diaphragm on electrolyte can be increased, the electrolyte retention capability can be enhanced, a continuous micro-nano ion transmission channel can be constructed in the coating, and the lithium ion migration efficiency can be improved.

The invention relates to the technical field of batteries, in particular to a composite diaphragm, a preparation method thereof and a secondary battery. The composite diaphragm comprises: a base film; the coating is arranged on the surface of at least one side of the base film in the thickness direction, and the coating comprises a composite material; the composite material comprises polyimide fibers and a solid electrolyte coating at least part of the surface of the polyimide fibers. According to the composite diaphragm, the coating of the composite diaphragm contains the composite material, so that the lithium ion flux can be improved, the lithium deposition is uniform and compact, the growth of lithium dendrites is inhibited, the thermal shrinkage performance and mechanical strength of the diaphragm can be greatly improved, and the volume change in the charging and discharging process of a lithium metal negative electrode can be coped with; and meanwhile, the use amount of the electrolyte can be reduced, so that the cycle performance, the rate capability and the safety performance of the battery are improved.

The polyester film according to the embodiment prepared while the crystallinity of a copolymerized polyester film is controlled can be improved in thermal properties and chemical properties. Specifically, the polyester film has not only an excellent shrinkage rate with respect to temperature, but also excellent adhesive strength by a solvent even when applied to gravure printing, UV curing printing, and VSOP printing, making it suitable for a heat shrinkage process and a seaming process. In addition, the polyester film can be applied to a recycling process since it has an appropriate change in crystals during washing with an aqueous solution of NaOH, and the generation of fusion is suppressed even upon prolonged high-temperature drying.

The utility model discloses a heat shrink packaging machine for a high-grade cigarette packaging box, which relates to the technical field of packaging machines, and comprises a rack, support plates are symmetrically arranged at the front end of the outer top surface of the rack, rotating shaft rollers I are symmetrically and rotationally arranged between the two support plates, and the exteriors of the two rotating shaft rollers I are rotationally connected with a conveying belt; the rear end of the outer top surface of the rack is fixedly provided with a heat shrinking machine through bolts, the outer walls of the front side and the rear side of the heat shrinking machine are provided with a feed port and a discharge port in a penetrating mode respectively, a plurality of second rotating shaft rollers are rotationally installed in the heat shrinking machine, and the front ends of the outer top surfaces of two supporting plates are provided with guide assemblies; a hot cutting assembly is arranged at the rear ends of the outer top faces of the two supporting plates. Cigarette packaging boxes to be thermally shrunk can be stably conveyed through the arranged conveying belt, the cigarette packaging boxes of different sizes can be limited and guided under the assistance of the guiding assembly, then the positions of the cigarette packaging boxes are corrected, and therefore practicability is improved.

The invention relates to the technical field of polyester yarns, in particular to a high-strength polyester yarn and a preparation method thereof.The method comprises the steps that PET slices with the intrinsic viscosity of 0.85-1.00 dL / g are subjected to melt spinning and cooled through circular blowing to obtain nascent fibers, the nascent fibers are subjected to surface activating treatment through low-temperature plasma or esterase bio-enzyme, and the high-strength polyester yarn is obtained; the preparation method comprises the following steps: firstly, activating fibers, then carrying out graft copolymerization reaction on the activated fibers and graft monomer solutions such as fluorinated acrylate and acrylic acid, and finally, cleaning, drying, carrying out thermal network and winding on the composite fibers, so that the prepared polyester yarn has the breaking strength of more than or equal to 7.7 g / D, the dry heat shrinkage rate of less than or equal to 3.5% and the shrinkage tension of less than or equal to 0.03 g / D, has the high functional characteristics of lasting super-hydrophobicity, antibacterial property and the like, is excellent in washing resistance, and is suitable for industrial production. The problem that functionalization is difficult due to surface inertia of the polyester fiber is solved, and the mechanical property and the surface characteristic of the polyester fiber are comprehensively improved.

This invention relates to the field of packaging film technology and provides a low-temperature polyolefin packaging film and its preparation method. The packaging film comprises a three-layer co-extruded structure consisting of an outer layer, a middle layer, and an inner layer. The components of each layer are as follows: Inner layer: metallocene polyolefin, high-performance polypropylene, modified lignin nanofibers, and erucamide / silica composite microspheres; Middle layer: PCR, modified nano-kaolinite, and trimethylolpropane triacrylate; Outer layer: PCR, modified tourmaline nanotubes, benzoyl peroxide microcapsules, and polydopamine-coated chitosan. This invention uses PCR, which is more energy-efficient and environmentally friendly. The addition of modified lignin nanofibers to the inner layer improves tensile strength; the addition of modified nano-kaolinite to the middle layer improves thermal shrinkage; the addition of modified tourmaline nanotubes to the outer layer lowers the crosslinking reaction initiation temperature and improves shrinkage; and the addition of polydopamine-coated chitosan allows for reversible recombination upon damage, improving puncture strength.

The application discloses a glass fiber separator for lead-acid storage batteries and a preparation process thereof and belongs to the technical field of automobile lead-acid storage batteries. The separator is prepared from superfine glass fibers as a base, with the addition of nano-silicon dioxide fillers, nano-attapulgite-nano-boron nitride modifiers, dispersants, binders and acid-resistant stabilizers, and is prepared through wet papermaking, segmented drying and hot-pressing shaping. The separator has the advantages of high porosity, fast acid absorption speed, high tensile strength, acid-erosion resistance and low thermal shrinkage rate, and the 100% DOD cycle life of an assembled battery can reach 912 times, the service life of a starting battery for an automobile is significantly prolonged, the process is stable and environment-friendly, and the process is suitable for industrial mass production.

The utility model discloses a disposable cup conveying mechanism of a heat shrinking machine, which comprises a conveying part and a shaping part, the conveying part comprises a left transmission chain, a right transmission chain and a plurality of cup supporting pieces, the cup supporting pieces are transversely arranged, and the two ends of each cup supporting piece are respectively connected with the left transmission chain and the right transmission chain; the shaping component comprises a plurality of shaping sets, one cup supporting piece is provided with one shaping set, each shaping set comprises a cup blocking piece and a cup jacking piece which are installed on the cup supporting piece, and the cup jacking piece transversely moves relative to the cup blocking piece and extends into a cup. A cup is placed on a cup supporting piece of the conveying component and is conveyed in the discharging direction under the driving of a left transmission chain and a right transmission chain, a cup jacking piece moves towards the cup in the conveying process, a cup blocking piece blocks the cup, the cup jacking piece stretches into the cup, a film at a cup opening enters the cup and is attached to the inner wall of the cup body, in this way, the film enters a thermal shrinkage furnace, and the cup body is wrapped by the film in a shrinkage mode. In addition, the containing cavity with the cup opening is reserved, the disposable cups can be stacked together in a sleeved mode when collected, and stacking of the cups is facilitated.

A heat-shrinkable polyester film is provided, in which the loss coefficient and the like are controlled in a plurality of temperature regions, and which has excellent wrinkle resistance characteristics. The heat-shrinkable polyester film is a heat-shrinkable polyester film derived from a polyester resin composition containing 30% to 90% by weight of an amorphous polyester resin and 10% to 70% by weight of a crystalline polyester resin with respect to the total amount, in which (a) a loss coefficient obtained using a dynamic viscoelasticity measuring apparatus has a first loss coefficient peak in a temperature region of below 100° C.; (b) a loss coefficient obtained in the same manner has a second loss coefficient peak in a temperature region of 100° C. or higher; and (c) a heat shrinkage ratio obtained when the film is immersed in hot water at 80° C. for 10 seconds is 30% or more.

The invention relates to the technical field of superconducting magnets, in particular to a superconducting magnet system. The superconducting magnet system provided by the invention comprises a plurality of superconducting coil units and a connecting structure, the superconducting coil units are connected in series through connecting structures to form an annular magnet structure; the connecting structure comprises a connecting plate, a flexible connecting piece and fixing ends, the connecting plate is provided with a connecting groove, the flexible connecting piece is fixed to the connecting groove, the two ends of the flexible connecting piece are fixed to the two fixing ends, and the two superconducting coil units are connected through the two fixing ends. The superconducting coil units are connected through the flexible connecting pieces so as to adapt to infinitesimal displacement of the connecting interface caused by thermal shrinkage difference, stress concentration is avoided, and fretting wear of the connecting interface is prevented.

This invention belongs to the field of polymer materials, specifically relating to a low-heat-shrinkage polymeric film for laser drilling and its preparation method. The film comprises modified polyphenylene ether resin, vinyl-containing benzoxazine resin, a specific cationic initiator, a toughening agent, and inorganic modified fillers: gadolinium lanthanum zirconate core-shell nanocrystals and lithium aluminum borosilicate nanowires. The preparation method includes: first, surface-treating the two inorganic fillers with a silane coupling agent and then dispersing them in a solvent to obtain a slurry; then, mixing this slurry with the modified polyphenylene ether resin, vinyl-containing benzoxazine resin, cationic initiator, and toughening agent to form a homogeneous adhesive; finally, coating the adhesive onto a carrier film and drying and curing it at three temperature stages from low to high to obtain the finished film. The film prepared by this method exhibits extremely low heat shrinkage during laser drilling, effectively controlling resin protrusion or indentation defects on the hole wall, and significantly improving the quality and reliability of micropore processing.