500 results about "BoPET" patented technology

This case relates to a self-healing optical film and its preparation method. The optical film is made by adding a nanoparticle suspension to PET masterbatch as the main material during its melt extrusion process, resulting in a cast sheet. After biaxial stretching, a self-healing coating liquid is coated online, followed by shaping and cooling. The nanoparticle suspension includes nano-titanium oxide, MAH-PET polymer, ATO nanoparticles, and titanate coupling agent. The self-healing coating liquid is produced by core-shell emulsion polymerization, forming a nano-silica hard core and an acrylate functional monomer polymer soft shell. This invention adds the nanoparticle suspension by in-situ feeding in the middle of the extruder, reducing steps, improving dispersion uniformity, and making the film surface smoother. Then, the self-healing coating liquid is applied online after longitudinal stretching and before transverse stretching, forming a film on the film surface, improving the hardness and scratch resistance of the film material, enabling rapid self-healing at room temperature, strong stability, and avoiding the occurrence of rainbow patterns.

The invention relates to the technical field of films, in particular to a high-surface tension aluminized base film and a preparation method thereof. The method comprises the following steps: grafting modified fumed silica with a silane coupling agent KH-570, and grafting a ternary polymerization shell layer composed of 2-acrylamide-2-methylpropanesulfonic acid, lauryl methacrylate and glycidyl methacrylate on the surface of the modified fumed silica to obtain organic anti-sticking silica; secondly, synthesizing an aromatic sulfonated polyester prepolymer, loading nano titanium dioxide, and carrying out melt blending extrusion with polypropylene to form polar cluster polypropylene master batches; and finally, blending polypropylene resin, the master batch and maleic anhydride grafted polypropylene, and carrying out melt extrusion, air cooling and slow cooling and two-way stretching molding. The obtained base film is high in surface tension, high in aluminized layer adhesive force, excellent in oxygen and water vapor barrier property, good in thermal stability and suitable for the field of high-end packaging.

The invention relates to the technical field of optical films, and discloses a PET-based composite optical film and a preparation method thereof.The optical film is prepared from 100 parts of PET master batch, 5-10 parts of anti-blue-light nanofiller and 1-3 parts of interfacial compatibilizer through melt extrusion, asynchronous two-way stretching, online anti-fingerprint coating liquid coating and cooling and rolling; the blue-light-resistant nano filler is a core-shell structure filler prepared by taking KH570 silanized nano cerium oxide as a core, polymerizing by grafting glycidyl methacrylate to form a shell layer, and then reacting with 1H-benzotriazole-1-methanol. The anti-fingerprint coating liquid is prepared from perfluoropolyether modified siloxane acrylate and nano silicon dioxide sol. Through core-shell filler design and functional coating online coating, the technical problems that inorganic nanoparticles are easy to agglomerate and organic small molecule auxiliary agents are easy to migrate are synergistically solved, and the obtained optical film has excellent properties of high light transmittance, low haze, efficient blue light resistance and lasting fingerprint resistance and is good in durability.

The invention relates to the technical field of composite films, and particularly discloses a low-temperature heat-sealable high-strength BOPP composite film and a preparation process thereof.The BOPP composite film is prepared by adopting three-layer co-extrusion and two-way stretching processes, and the balance between high strength and low-temperature heat sealability is achieved. The composite film comprises an anti-adhesion surface layer, a core layer and a low-temperature heat-sealing layer; the anti-adhesion surface layer is prepared from the following raw materials: homo-polypropylene, a composite anti-adhesion agent, a slipping agent and PP-g-MAH; the composite anti-adhesion agent is prepared from modified silicon dioxide and modified diatomite in a mass ratio of 3 to 1; the raw materials of the core layer comprise homo-polypropylene, an antistatic agent and a coupling agent, and the raw materials of the low-temperature heat sealing layer comprise an ethylene-vinyl acetate copolymer, PP-g-MAH, a polyolefin elastomer, POE-g-MAH, a modified nucleating agent and an antioxidant, so that the balance of high strength and low-temperature heat sealability is realized, interlayer performance complementation is realized, the mechanical strength is improved, the heat sealing temperature is reduced, and the service life is prolonged. The overall peel strength is improved, and no layering phenomenon exists during stretching.

The invention belongs to the technical field of high polymer materials, and particularly relates to a PET decorative film and a preparation method thereof. The preparation method comprises the following steps: synthesizing hydroxyl-terminated hyperbranched polyester by taking pentaerythritol and 2, 2-dimethylolpropionic acid as raw materials, and reacting with polyol glycidyl ether to prepare an epoxy-terminated organic modifier; silver-loaded nano silicon dioxide subjected to surface treatment by an amino silane coupling agent is used as inorganic functional particles; pET resin, an organic modifier and inorganic functional particles are subjected to melt blending and extrusion granulation, and modified PET is prepared; the modified PET is prepared into the film through a two-way stretching process. Epoxy groups of the organic modifier chemically react with amino groups at the tail end of a PET molecular chain and on the surfaces of inorganic particles respectively, a stable organic-inorganic hybrid network is constructed, synergistic improvement of reinforcement, toughening and long-acting antibiosis is achieved, and the technical problems that functional particles are not uniform in dispersion, interface bonding is weak, and antibacterial components are prone to migration are effectively solved.

The invention discloses a bio-based low-VOC (volatile organic compound) water-based ink composition based on microbial fermentation PHA (polyhydroxyalkanoate) as well as a preparation method, application and a printing method thereof, and belongs to the technical field of printing ink and water-based polymer dispersion. The ink adopts a unique protective colloid-free PHA latex system, and is supplemented with precise crosslinking equivalent regulation and control. Compared with the conventional bio-based water-based ink which can be applied to a plastic film only by depending on prime coat or high-energy-consumption drying in the market, the bio-based water-based ink disclosed by the invention can realize excellent adhesion (0-1 level) and wet rubbing resistance on base materials such as BOPP / BOPET and the like without prime coat, and the printing process is greatly simplified. Under the condition that the environment-friendly high standard of low VOC and no PFAS is ensured, the high-speed printing energy consumption is remarkably reduced with lower drying enthalpy, the back sticking pain point is solved, meanwhile, the long working life and the excellent paper-based ink removal property are achieved, and the industrial problem that environment-friendly compliance and high-performance printing are difficult to achieve at the same time is effectively solved.

The invention relates to the technical field of polymer functional material processing, and particularly discloses a polyethylene waterproof breathable film using PTFE micro powder as an opening agent and a preparation method of the polyethylene waterproof breathable film. The waterproof breathable film is prepared from the following components in parts by weight: 50-70 parts of linear low-density polyethylene, 10-40 parts of PTFE (Polytetrafluoroethylene) micro powder, 3-8 parts of a modified compatilizer and an auxiliary agent. The preparation method comprises the following steps: S1, activating PTFE micro-powder by a silane coupling agent and coating the PTFE micro-powder with polyethylene wax to obtain modified micro-powder; s2, uniformly mixing all the components; s3, carrying out melt extrusion at 180-210 DEG C through a double-screw extruder, and carrying out tape casting to form a cast sheet; s4, the casting piece is heated to 90-115 DEG C for two-way stretching, and micropores are formed through interface stripping between the PTFE particles and the base body; and S5, carrying out heat setting at 120-130 DEG C, cooling, and rolling to form the film. Through the synergistic effect of the self-made compatilizer and the pretreatment process, the interface anchoring force is enhanced, the problems of powder falling and water leakage of highly-filled PTFE are solved, and meanwhile, high moisture permeability, high hydrostatic pressure resistance and high mechanical property are taken into account.

The invention discloses a waterproof bag film material and a preparation method thereof, relates to the technical field of polybutylene terephthalate polymer materials, and belongs to the patent classification number C08L67 / 02. The method comprises the following steps: sequentially carrying out silane coupling agent modification and solid-phase free radical polymerization on activated gas-phase nano silicon dioxide to construct a core-shell structure nano reinforced filler with rich epoxy groups on the surface; carrying out melt blending extrusion on the mixture, PBT (Polybutylene Terephthalate) resin, a chain extender, an end-capping reagent and the like to obtain hydrolysis-resistant modified granules; a PBT base film is prepared through casting, two-way stretching and heat setting; the preparation method comprises the following steps: performing ultraviolet ozone activation on a base film, coating a super-hydrophobic coating solution prepared from aminated nano silicon dioxide, epoxy-terminated polydimethylsiloxane, a cross-linking agent and an accelerant, and heating and curing to finally obtain the high-strength high-waterproof PBT waterproof bag film. The prepared film has excellent mechanical strength, body hydrolysis resistance and super-hydrophobic surface, the water contact angle is high, the coating adhesive force is high, and the waterproof performance is lasting and stable under high-frequency bending.

The invention discloses a preparation method of a high-performance electric-breakdown-resistant capacitor base film, which comprises the following steps: S1, preparing modified polypropylene master batch: mixing polypropylene, a cycloolefin copolymer, a barium titanate-carbon nanotube modified composite filler and an antioxidant, and carrying out melt blending, extrusion and granulation to obtain the modified polypropylene master batch; s2, carrying out melt extrusion on the modified polypropylene master batch, cooling and casting; s3, carrying out two-way stretching and heat setting on the obtained casting piece to obtain a polypropylene film; and S4, performing plasma treatment on the surface of the polypropylene film to obtain the high-performance electric-breakdown-resistant capacitor base film. The high-performance electric-breakdown-resistant capacitor base film prepared by the method has excellent electric breakdown resistance, mechanical strength, flame retardance and heat resistance, has a long-acting flame retardant effect, is excellent in comprehensive performance and has a wide market application prospect.

The invention discloses an aluminum-plastic film for a high and low temperature resistant solid-state battery. The aluminum-plastic film is sequentially composed of a first nylon layer, a first adhesive layer, a second nylon layer, a second adhesive layer, an aluminum foil layer, a third adhesive layer, a third nylon layer, a fourth adhesive layer and a fourth nylon layer from inside to outside. The first nylon layer adopts a copolymer casting film of PA6, PA66 and PA1010 as a heat sealing layer, so that the brittleness of a material in an extremely low-temperature environment can be avoided, and the low-temperature resistance of a finished product film is improved. The second nylon layer and the third nylon layer adopt PA6 biaxially oriented films as middle supporting layers, so that the stamping resistance of the finished aluminum-plastic film can be further improved. The fourth nylon layer adopts a PA66 biaxially oriented film as an outer protective layer, so that the high-temperature resistance of the finished aluminum-plastic film can be improved, and the problem of scalding in the heat sealing process is avoided. The barrier that a traditional aluminum plastic film is not resistant to low temperature and high temperature is broken through, and the application range is widened.

The application discloses a quinoline small molecule blended modified polymer dielectric material and a preparation method and application thereof, and belongs to the technical field of capacitor films. The preparation raw materials comprise quinoline derivatives, polymethyl methacrylate, styrene-methyl methacrylate copolymer, polyetherimide, polypropylene and N-methyl pyrrolidone solution, and the preparation steps comprise blending and film preparation. The blending solution or eutectic mixture is prepared through blending, and the polymer dielectric film is prepared through a flow casting method or bidirectional stretching. The prepared quinoline small molecule blended modified polymer dielectric film has excellent electrical properties, can reduce the leakage current of the polymer material, has high DC breakdown field strength, high energy storage density and low energy loss, and is easy to realize large-scale production.

The invention relates to the technical field of optical thin films, and particularly discloses a high-birefringence laminated reflecting film and a preparation method thereof. According to the laminated reflecting film, 4, 4 '-biphenyl dicarboxylate modified PET is used as a raw material of an A layer, PMMA or PETG is used as a raw material of a B layer, the difference value of the glass transition temperatures Tg of the raw material of the A layer and the raw material of the B layer is controlled to be smaller than or equal to 5 DEG C, and the laminated reflecting film formed by alternately laminating the raw material of the A layer and the raw material of the B layer is subjected to synchronous two-way stretching and heat setting treatment; according to the application, PET is modified by the BB monomer, and a biaxial stretching process and the content of the BB monomer are regulated and controlled for the first time, so that Tg difference values of the raw materials of the layer A and the raw materials of the layer B are close, meanwhile, a refractive index difference value is increased, the reflecting film with excellent optical performance and mechanical performance can be obtained with a small number of lamination layers, and the reflecting film has high in-plane birefringence, high in-plane birefringence, high in-plane birefringence, high in-plane birefringence, high in-plane birefringence and high in-plane birefringence. And the reflectivity reaches 74% or above.

The invention belongs to the technical field of polyester window films, and particularly relates to a high-transmittance polyester film and a preparation method thereof. The composite window film comprises a wear-resistant layer and a BOPET base material layer, the wear-resistant layer is obtained by curing a coating liquid, and the coating liquid comprises the following raw materials in parts by mass: 100 parts of an epoxy acrylic resin emulsion, 8-12 parts of silane modified silicon dioxide, 3-5 parts of a modifier, 0.1-0.3 part of a light stabilizer and 40-60 parts of water. The modifier is prepared by reacting epoxy cyclohexyl ethyl POSS and amino polyethylene glycol hydroxyl according to a molar ratio of 1: (8.1-8.2), the solid content of the epoxy acrylic resin emulsion is 30-35wt%, and the epoxy acrylic resin emulsion is prepared by carrying out emulsion polymerization on an unsaturated epoxy monomer, a soft monomer and a hard monomer according to mass ratios of (15-25): (20-40): (40-60). The modifier has a flexible spacer arm formed by a rigid nano-sized inorganic siloxane cage core and a polyethylene glycol chain, and the flexible spacer arm acts on the surface of silicon dioxide to play a role in fixing and also plays a role in a three-dimensional barrier to block silicon dioxide agglomeration, and meanwhile, the wear resistance and the light transmittance of the polyester film are improved.

The invention relates to the technical field of metallocene polyolefin materials, and particularly discloses a modified polyolefin film material as well as a preparation method and application thereof. The film material is prepared from the following components in parts by weight: 50 to 70 parts of metallocene linear low-density polyethylene, 20 to 35 parts of ethylene-butyl acrylate copolymer, 15 to 25 parts of polyolefin elastomer, 5 to 15 parts of bio-based degradable polyester elastomer, 3 to 8 parts of reactive compatilizer, 5 to 15 parts of organic modified layered double hydroxide, 8 to 20 parts of composite flame retardant, 0.3 to 1.5 parts of antioxidant and 0.5 to 1.5 parts of lubricant. The preparation method comprises the steps of melt blending, casting extrusion, two-way stretching and the like. The thin film has low hardness, high elongation, low melting point and moderate mechanical strength, the performance of the thin film can accurately meet specific application requirements, and the thin film is particularly suitable for the field of composite fabric of clothes, bags, shoes, hats and the like with high requirements for touch feeling and elasticity.

The application discloses a kind of high-efficiency polytetrafluoroethylene filter material and preparation method thereof, it is related to filter material technical field, including following process: polytetrafluoroethylene base band is stretched in three directions, and ePTFE layer is obtained;ePTFE layer is placed above non-woven fabric layer, laminated, compounded, heat setting, and filter material is obtained.The application is based on horizontal and vertical stretching, and the middle part of polytetrafluoroethylene base band is stretched upward or downward arc by adopting olive-shaped roller, and reaction force is applied to both sides, so that the thickness of the middle of polytetrafluoroethylene base band is less than the thickness of both sides, the compensation of horizontal expansion stretching is formed, the complete stretching of polytetrafluoroethylene base band is promoted, the generation of node is reduced, the degree of fiberization of film is improved, the pore shape tends to be complex, the three-dimensional space structure of pore in ePTFE layer is generated more, and the pore performance and strength are optimized, so as to improve the filtering efficiency and mechanical strength of the prepared filter material.

The invention relates to the field of solid electrolyte preparation, and discloses a preparation method of a solid electrolyte membrane, the solid electrolyte membrane, a pole piece and a battery, the preparation method of the solid electrolyte membrane comprises the following steps: S1, uniformly mixing solid electrolyte powder with a fiberized binder to obtain a mixture; s2, rolling the mixture to form a primary membrane with a preset thickness; and S3, carrying out transverse and longitudinal two-way stretching on the primary membrane at a first temperature to obtain the solid electrolyte membrane, wherein the binder comprises PVDF (Polyvinylidene Fluoride) and / or a copolymer of PVDF; and the thickness of the solid electrolyte membrane is not greater than 10 microns. According to the invention, the excellent film-forming property and mechanical strength of the binder system are utilized, so that the solid electrolyte membrane has better processability, the solid electrolyte membrane can be stretched to be less than 10 microns, the safety performance of the battery can be guaranteed, and the energy density of the battery can be considered.

The invention provides a preparation method of a shrinkage-resistant supercritical TPU foaming material, and relates to the technical field of foaming materials, and the preparation method comprises the following steps: selecting an unactivated inorganic filler, and activating the inorganic filler by using a coupling agent containing amino or hydroxyl; uniformly dispersing the activated powder into a TPU base material through a pre-dispersion-dispersion process, and extruding into a plate through an extruder; placing the extruded TPU plate in a two-way stretching instrument, setting the temperature to be higher than the Vicat softening point and lower than the melting point of the TPU, and enabling the material to deform in the transverse direction and the longitudinal direction through two-way stretching; by introducing the filler with groups such as amino or hydroxyl, the filler and TPU can generate hydrogen-bond interaction, so that the dimensional stability of the material is improved; by adding the inorganic filler, the effect of heterogeneous nucleation points is achieved in the supercritical foaming process, and by means of two-way stretching and molecular chain orientation, the strength of the material in the length-width direction is improved, and the post-curing speed is increased.

A purpose of the present invention is to provide a biaxially stretched polyester film for laminating to a metal sheet, which can be prevented or inhibited from peeling from the metal sheet during forming and which can prevent or inhibit the metal sheet from suffering corrosion that can be caused by retorting. Another purpose is to provide a laminate and a container. The biaxially stretched polyester film for laminating to a metal sheet comprises an A layer including poly(ethylene terephthalate) and a B layer including a polyester which is substantially amorphous. T1 (i.e., the melting point of the polyester which is substantially amorphous) is 180-215°C. The difference between T1 and T2 (i.e., the melting sub-peak temperature of a differential scanning calorimetry curve of the biaxially stretched polyester film for laminating to a metal sheet) is 15-40°C. The laminate comprises a metal sheet and the biaxially stretched polyester film for laminating to a metal sheet. The container includes the laminate.

The invention discloses an optical encryption film material as well as a preparation method and application thereof, and the preparation method of the optical encryption film material comprises the following steps: uniformly mixing terephthalic acid, aliphatic dibasic acid and water to obtain a mixed aqueous solution; under the stirring action, 1, 5-pentamethylene diamine is slowly and dropwise added into the mixed aqueous solution, and a transparent salt solution is obtained; carrying out condensation polymerization reaction on the transparent salt solution to obtain nylon synthetic resin; preparing the nylon synthetic resin into a film; and carrying out two-way stretching on the film to obtain the optical encryption film material. The preparation method of the optical encryption thin film material is simple and low in cost, and the optical encryption material with higher cost performance can be prepared.

The invention discloses a preparation method of an environment-friendly bio-based PVC (polyvinyl chloride) film. The preparation method comprises the following steps: step S01, pre-treating and modifying bio-based raw materials; s02, PVC resin environment-friendly activating treatment is carried out; step S03, precisely compounding and pre-mixing according to a compound formula; step S04, carrying out high-shear melt blending and homogenization; step S05, carrying out in-situ grafting modification on the bio-based compatilizer; step S06, carrying out melt tape casting and preliminary shaping; s07, carrying out two-way stretching modification and performance strengthening; and S08, environment-friendly post-treatment and finished product rolling are conducted. The environment-friendly stabilizing agent has the beneficial effects that pollution can be reduced from the source, resource circulation can be realized, meanwhile, the interface bonding force between a biological base and PVC and the thermal stability of a system can be greatly improved, and the problems of poor compatibility and poor effect of the environment-friendly stabilizing agent are solved; the tensile strength, the barrier property, the surface activity and the antioxidant and antibacterial properties of the film can be remarkably improved, and the film is suitable for popularization and application.

This invention discloses a method for preparing a heat-resistant, flame-retardant, and electrically breakdown-resistant modified polypropylene capacitor base film, comprising the following steps: S1, preparing composite intercalated organic montmorillonite and microcapsule-type reinforcing particles; S2, preparing modified polypropylene masterbatch: mixing polypropylene masterbatch, composite intercalated organic montmorillonite, microcapsule-type reinforcing particles, initiator, and additives, heating and stirring to obtain modified polypropylene masterbatch; S3, adding polyvinylidene fluoride to the premix, heating and stirring, and melting and extruding the resulting mixture; S4, cooling and casting; S5, biaxial stretching, heat setting, cooling, and corona treatment to obtain a heat-resistant, flame-retardant, and electrically breakdown-resistant modified polypropylene capacitor base film. This invention, by filling and modifying polypropylene with composite intercalated organic montmorillonite and microcapsule-type reinforcing particles, and by compounding with polyvinylidene fluoride, comprehensively improves the heat resistance, flame retardancy, electrical breakdown resistance, and mechanical strength of the polypropylene capacitor base film.

The invention relates to a dry-method electrode membrane supported by a skeleton membrane and a preparation method of the dry-method electrode membrane, and the dry-method electrode membrane comprises a porous skeleton membrane which is an ultrathin two-way stretched porous polymer membrane and has high porosity; and the dry-method electrode raw material is formed on the surface of the porous framework membrane and in pores. Specifically, the porous skeleton membrane adopts an ultrathin two-way stretching process to form a high-porosity structure, pores and the surface of the porous skeleton membrane provide uniformly distributed carriers for a dry-method electrode raw material, the use amount of a binder is reduced, and the binding force of an active substance and a conductive agent is enhanced. The dry-method electrode raw material is embedded into the surface and pores of the skeleton membrane, a three-dimensional conductive path is formed by using the high specific surface area and pore structure of the skeleton membrane, meanwhile, the preparation process is simplified, and the problems of increased surface resistance and low efficiency caused by a traditional spraying process are avoided.

The invention discloses a high-performance waterborne polyurethane primer applied to an optical-grade biaxially oriented polyester film and a preparation method of the high-performance waterborne polyurethane primer, and belongs to the field of waterborne polyurethane primer. The primer is prepared from the following raw materials in parts by weight: 52 to 68 parts of polyester polyol, 4 to 7 parts of sulfonate polyester polyol, 1 to 3 parts of polyether polyol, 1 to 6 parts of carboxylic acid type hydrophilic compound, 16 to 38 parts of isocyanate, 0.1 to 0.5 part of alcohol chain extender, 1 to 5 parts of amine chain extender, 0.02 to 0.06 part of catalyst, 1 to 6 parts of neutralizer, 160 to 280 parts of acetone, 1340 to 1740 parts of deionized water, 0.3 to 2 parts of silane coupling agent, 0.3 to 1 part of defoaming agent, 1 to 5 parts of wetting agent and 260 to 300 parts of isopropanol. And 4-7 parts of a closed curing agent. The primer prepared by the invention has good high-temperature yellowing resistance on an optical-grade biaxially oriented polyester film, is free of stripes after being coated, has the adhesive force of grade 0, and also has the advantages of flame retardance, environment friendliness, no toxicity, low VOC (Volatile Organic Compounds), low odor and the like.

The utility model discloses a PET (Polyethylene Terephthalate) film two-way stretching device, which comprises a conduction rack, a hot ironing assembly, a transverse stretching assembly and a calendering assembly, and is equipped with a compression roller and an output rotating roller, and the compression roller is in close contact with the surface of a conical roller sleeve, so that the stable transmission of a PET film is effectively ensured, and the poor sliding or loosening of a film material is avoided. Through accurate matching of the conical roller and the surface of the conical roller sleeve, pressure distribution in the transverse stretching process can be accurately controlled, and an efficient transverse stretching effect is provided. Besides, the two-way stretching structure designed by combining the rotating roller and the damping rotating roller integrally realizes accurate control in the longitudinal direction and the transverse direction, ensures that the stretching effect of the PET film is uniform and stable, and finally obtains a high-quality two-way stretching film. The PET film stretching device has the advantages of simple structure, remarkable stretching effect and the like, and can be widely applied to the PET film production process.

The present invention relates to a multi-layer biaxially-oriented, white-opaque polyester (BOPET) film with dead-fold properties, a process for producing the multi-layer biaxially oriented polyester film. In particular the present invention describes BOPET films with folding characteristics with white opaque appearance to be used in industry, primarily in packaging applications.

To provide: a biaxially oriented polyester film that can reduce environmental impact, can reduce a yellow tint, and can inhibit or reduce film rupture that may occur during drawing; a laminate comprising the biaxially oriented polyester film; and a packaging container comprising the laminate.SOLUTION: A biaxially oriented polyester film 8 contains a chemically recycled polyester. In a molecular weight distribution curve obtained by gel permeation chromatography of the biaxially oriented polyester film 8, the area ratio of a region having molecular weight of 1000 or less is from 1.9% to 5.5%, inclusive, of the total peak area. The chemically recycled polyester can reduce environmental impact. The area ratio being less than or equal to 5.5% can reduce a yellow tint. The area ratio being greater than or equal to 1.9% can prevent the stress during drawing in a manufacturing process (i.e., the drawing stress) from excessively increasing, and thus can inhibit or reduce film rupture that may occur during the drawing.SELECTED DRAWING: Figure 1

The object of this invention is to provide a polypropylene film with excellent transfer resistance and handling properties. [Solution] The surface with a relatively low surface roughness Sa is designated as surface A, the surface with a high surface roughness Sa is designated as surface B, and the sharpness of the surface height distribution of surface A is designated as Sku. A , the Sa on surface B is Sa B In that case, the Sku A The value is 5.0 or more and 250 or less, and the aforementioned Sa B 100nm or larger 1.0×10 3 / Log(Sku A A biaxially oriented polypropylene film characterized by having a size of ) nm or less.

The application discloses a restraining module for preventing arch deformation in a bidirectional stretching process and a bidirectional stretching device, and the restraining module comprises a fixed frame, a power source is installed on the fixed frame, the power source drives the arc surface of an arc roller to rotate, the arc roller can be adjusted to form different arc heights, two sets of expander rollers are arranged on the two sides of the fixed frame, the two sets of expander rollers are located downstream of the arc roller, the two sets of expander rollers have initial angles which are perpendicular to the length of the film, and the two sets of expander rollers can be unfolded and form different unfolding angles relative to the initial angles. The arc height of the arc roller is dynamically adjusted to change the travel of the film along the conveying direction when the film is stretched in the transverse direction, and the unfolding angle of the two sets of expander rollers is dynamically adjusted to generate a forward oblique pulling force on the film, which can effectively offset the arch deformation of the film, reduce the orientation anisotropy of the film at different positions, make the mechanical properties and thermal shrinkage rate of the film uniform, and improve the surface flatness and thickness uniformity.

To provide a container lid which can prevent cracks from occurring by dispersing external forces acting on the container lid without concentrating them on specific points, even when a material such as biaxially oriented polystyrene that easily cracks is used. [Solution] The container lid L is a container lid made of a synthetic resin sheet that covers the top opening of the container body, and has a top plate portion 1 with a flat portion and side wall portions 2a to 2d that extend downward from the periphery of the top plate portion 1, and the side wall portions 2a to 2d have trapezoidal first protrusions 21a to 21f that protrude outward at a predetermined interval in the circumferential direction and extend upward from the lower end of the side wall portions 2a to 2d to a height that does not reach the upper end.

The present application belongs to the field of polyester film, and relates to an optical polyester film for flexible display, which has a single-layer A, double-layer A / B, three-layer A / B / A or A / B / C structure; wherein the A layer, the C layer or / and the B layer contains a modified polyester; and then the single-layer A, double-layer A / B, three-layer A / B / A or A / B / C structure is made through bidirectional stretching. The optical polyester film has the characteristics of bending resistance, sufficient flexibility, strong bending resistance and the like, and the product can be widely applied to flexible display, especially the folding screen display field.