24 results about "Folding endurance" patented technology

To provide a biaxially stretched film that has excellent folding resistance and heat resistance.SOLUTION: A biaxially stretched film contains a polyethylene naphthalate copolymer (A), wherein the average of hysteresis loss ratios after a tensile cycle test up to 5% tensile strain in the MD direction and in the TD direction is 47.0% or less.SELECTED DRAWING: None

The invention relates to the technical field of papermaking additives, in particular to an elastomer reinforcing agent, a preparation method thereof and paper, and the elastomer reinforcing agent comprises the following raw materials in parts by weight: 70-80 parts of pure water, 11.5-14.5 parts of styrene, 3.0-4.0 parts of tert-butyl acrylate, 1.0-3.0 parts of 2-ethylhexyl acrylate and 1.8-2.2 parts of glycidyl methacrylate. 1.0-1.5 parts by weight of methyl methacrylate, 2.0-3.0 parts by weight of ethyl acrylate, 0.03 part by weight of an initiator, 0.18 part by weight of a terminator and 1.3-1.5 parts by weight of an emulsifier. The elastomer reinforcing agent disclosed by the invention has good mechanical properties, can be well stretched and rebounded, and can effectively enhance the folding strength and the ring crush index of paper when being applied to the paper; according to the preparation method disclosed by the invention, polymerization reaction is carried out step by step by controlling the form of generating the prepolymer, so that the conversion rate is increased, an additional purification step is not needed, and the technological process is simplified.

The present invention belongs to the technical field of specialty paper preparation, and specifically relates to a method for producing specialty paper. The method for producing specialty paper of the present invention uses a compound of bleached sulfate masson pine pulp and bleached wheat straw pulp to construct a three-dimensional skeleton structure in which long and short fibers are interwoven, and uses modified calcium titanate whiskers, modified magnesium borate whiskers and polyacrylate microspheres as fillers. The rigid skeleton of the modified calcium titanate whiskers and the flexible buffer of the modified magnesium borate whiskers form a stress gradient transmission, and the addition of polyacrylate microspheres can reduce local stress concentration. The three act synergistically to improve tensile strength and folding endurance. The high retention rate of acorn starch ensures that the filler is in full contact with the fiber, providing dense reaction sites for trans-aconitic acid crosslinking, thereby forming a water-resistant crosslinked network. Thus, the raw materials work synergistically to ensure that the produced specialty paper has excellent dry tensile strength, bursting resistance, folding endurance and wet strength retention rate.

An adhesive composition has a low dielectric constant, a low dielectric loss tangent, and an excellent folding endurance. The adhesive composition includes: with respect to the total of 100 parts by mass of the adhesive composition, 75 to 90 parts by mass of a styrene elastomer; 3 to 25 parts by mass of a modified polyphenyleneether resin having a polymerizable group at an end; and totally 10 parts by mass or less of an epoxy resin and an epoxy resin curing agent, wherein the styrene ratio of the styrene elastomer is less than 30%.

The invention provides a bio-based epoxy resin surface sizing agent as well as a preparation method and application thereof, and belongs to the technical field of bio-modified materials. According to the invention, the bio-based epoxy resin is prepared by taking natural renewable rosin as a raw material and a green eutectic solvent as a catalyst; preparing a resin emulsion by using a compounded system of an anionic emulsifier and a nonionic emulsifier as an emulsifier; and adding a proper amount of oxidized starch and distilled water into the prepared emulsion, and reacting to obtain the sizing agent finished product. According to the prepared bio-based epoxy resin sizing agent, the functional monomer is introduced, the water resistance and various physical strengths are enhanced, the performance bottleneck of a traditional rosin sizing agent is broken through, and the defects that the traditional rosin sizing agent is poor in durability, prone to aging, poor in water resistance and the like are overcome. The water resistance, tensile strength, bursting strength, folding strength and other properties of the paper can be effectively improved, the problems that a traditional product is poor in durability and prone to aging are fundamentally solved, and a technical support is provided for replacing a plastic product with a paper product.

The application discloses a kind of high folding resistance special paper and its preparation method, utilize the cellulose nanofilament with unique nanometer scale structure, high specific surface area, super high length-diameter ratio as the reinforcing material of cotton pulp fiber, simultaneously utilize pulp screening reorganization technology to realize the accurate regulation of cotton pulp fiber length distribution, optimize fiber distribution interval span, improve the uniformity and the rate of whisk of pulp, while guaranteeing the dewatering and water retention effect of pulp, overcome the problems such as the wide range of traditional cotton pulp fiber length distribution, the poor flexibility caused by the serious damage of fiber strength and the low folding resistance of cotton fiber paper, significantly improve the mechanical strength and flexibility of special paper, and can be applied in the field of high durability and folding strength requirement such as paper money, securities, map, chart paper and the like.

This invention provides a fiber-bonded reinforcing emulsion and its preparation method, belonging to the field of papermaking additives. The preparation method of the fiber-bonded reinforcing emulsion comprises the following steps: pre-modification, cationization treatment, and emulsion preparation. This method, without using acrylamide monomers or acrylamide components, improves the bonding performance with papermaking fibers, effectively enhancing the tensile strength, bursting strength, and internal bond strength of the paper while simultaneously improving its flexibility and folding endurance. It also effectively improves the fiber-bonded reinforcing emulsion's resistance to anionic interference and water resistance, increasing its reinforcing efficiency for paper; and further enhances the long-term storage stability of the fiber-bonded reinforcing emulsion.

The application discloses a high-performance paper wet strength agent as shown in structural formula (I) and application thereof in papermaking. The paper wet strength agent is prepared from a raw material including alicyclic polyamine, polybasic aliphatic amine, acrylate and epichlorohydrin, the content of hydroxyl groups in the molecular structure of the wet strength agent is high, the wet strength agent is more easily to form hydrogen bonds with hydroxyl groups of wood fibers, and the retention performance of the wet strength agent is greatly improved. Meanwhile, the presence of the hydrophobic alicyclic structure can effectively prevent the water absorption and expansion of the fibers, reduce the expansion and deformation performance of the paper sheet, and improve the wet strength of the paper. Compared with traditional wet strength agents, even at a lower dosage, the paper can still be endowed with good folding endurance, tensile strength and dry strength and other performances.

The application discloses a kind of light PU foamed soles and preparation method thereof, belong to foamed sole technical field, the sole is significantly improved shock absorption and folding resistance by optimizing material formula and preparation process.The sole is composed of ethylene-vinyl acetate copolymer, ethylene octene copolymer, SBS thermoplastic elastomer, polyether polyurethane and other raw materials, and introduces specific shock absorbing additive.Preparation method includes steps such as banxie, mixing, foaming forming, by accurately controlling temperature, time and turning over times, ensure the uniform mixing of material and the full performance of crosslinking reaction.Compared with prior art, the sole of the application is outstanding in shock absorption and folding resistance, and has important practical application value and market prospect.

The invention discloses a high-performance paper yarn and a preparation method thereof, and particularly relates to the technical field of textiles. The method comprises the following steps: preparing a padding working solution, carrying out two-dipping and two-rolling treatment on raw paper, and controlling the liquid carrying rate to be 60-80%; reducing the water content of the paper to 15-25% by adopting infrared pre-drying, and then carrying out medium-temperature rapid curing and drying at 85-95 DEG C for 15-20 seconds; cooling and rolling to obtain a reinforced paper roll; and slitting and twisting the reinforced paper roll to obtain the finished product paper yarn. Through a specific resin compounding system and a gradient drying and curing process, the technical contradiction that the strength and the flexibility of the paper yarn are difficult to consider at the same time is synergistically solved, the breaking strength and the folding strength of the paper yarn are synchronously and remarkably improved, and the process is continuous, efficient and suitable for industrial production.

The utility model discloses a super-tough folding-resistant high-strength cable, and relates to the technical field of cables, the super-tough folding-resistant high-strength cable comprises a cable body, a folding-resistant reinforcing layer and a folding-resistant buffer layer, the cable body comprises a wear-resistant sleeve and an internal cable conductor, and an insulating layer is sleeved outside the cable conductor; the folding-resistant reinforcing layer comprises a plurality of reinforcing cylinders arranged in the wear-resistant sleeve, and a plurality of tightly polymerized steel wires are fixed in the reinforcing cylinders; according to the utility model, the bending performance of the whole cable is improved under the action of the reinforcing cylinder in a manner that a plurality of steel wires are tightly gathered in the reinforcing cylinder, and the bending performance of the whole cable is improved by matching with the fillers used for buffering inside and outside the reinforcing cylinder, so that the service life of the cable is prolonged. Therefore, the cable is uniformly stressed and is not easy to damage and crack when being bent, the folding resistance is further improved, the toughness of the cable is improved, and the cable is not easy to damage and crack when being bent.

The utility model discloses an anti-explosion line pressing wheel for a corrugated board production line. The anti-explosion line pressing wheel comprises an upper compound line wheel, a lower compound line wheel, a first support and a second support. According to the device, when the upper double-line wheel and the lower double-line wheel rotate, the middle protrusions, the auxiliary protrusions and the grooves are correspondingly engaged, too shallow or too deep line pressing of a paperboard is avoided, the folding endurance of the paperboard in the using process is high, line explosion is avoided, the locking rods on the outer sides of the upper double-line wheel and the lower double-line wheel can be rotated subsequently, the two sets of locking rods are both separated from screw holes in the initial positions, and therefore the paperboard is prevented from being damaged. After the upper double-line wheel and the lower double-line wheel are moved to designated positions, the two sets of locking rods are rotated to be combined with the screw holes in the corresponding positions, the upper double-line wheel and the lower double-line wheel are fixed, and therefore the positions of the upper double-line wheel and the lower double-line wheel can be conveniently adjusted; and rapid alignment of the upper double-line wheel and the lower double-line wheel can be realized.

An adhesive composition having a low dielectric constant, low dielectric loss tangent, excellent folding endurance, and excellent heat resistance. The adhesive composition includes: with respect to the total of 100 parts by mass of the adhesive composition, 70 to 90 parts by mass of the styrene elastomer; 5 to 25 parts by mass of a modified polyphenyleneether resin having a polymerizable group at an end; totally 10 parts by mass or less of an epoxy resin and an epoxy resin curing agent, wherein the styrene ratio of the styrene elastomer is less than 42%.

The invention provides a detection device for production of a novel stone powder composite material, and relates to the technical field of folding endurance detection, the detection device comprises a host, a touch screen is arranged on the surface of the host, a base is fixedly connected below the host, a shell is arranged on one side, away from the host, of the base, and an auxiliary shell is arranged above the shell; an elastic clamping assembly is arranged on the inner wall of the auxiliary shell and comprises a limiting ring frame fixedly installed at the front end of the lower surface of the auxiliary shell, and a spring is fixedly connected to the lower surface of the limiting ring frame. The two side plates and the angle arc clamping plate are driven to be unfolded at the same time through pressing, the upper clamping structure penetrates through the lower clamping structure, paper is clamped in the upward recovery process of the upper clamping structure, the paper is preliminarily cut by a rhombic cutting plate arranged on the surface when the lower clamping structure is reset, and therefore the paper needing to be detected can be preliminarily clamped, and the detection efficiency is improved. And cutting operation is carried out in the clamping process, so that the paper detection efficiency is improved.

The invention discloses a light PU (polyurethane) foamed sole and a preparation method thereof, and belongs to the technical field of foamed soles, and the sole is remarkably improved in shock absorption and folding resistance by optimizing a material formula and a preparation process. The sole is composed of an ethylene-vinyl acetate copolymer, an ethylene-octylene copolymer, an SBS thermoplastic elastomer, polyether polyurethane and other raw materials, and a specific cushioning additive is introduced. The preparation method comprises the steps of banburying, mixing, foaming forming and the like, and uniform mixing of the materials and full proceeding of a cross-linking reaction are ensured by accurately controlling the temperature, the time and the turning frequency. Compared with the prior art, the sole disclosed by the invention is excellent in shock absorption and folding resistance, and has important practical application value and market prospect.

The application discloses a kind of corrugated board raw paper folding endurance detection device, belongs to folding endurance detection technical field.Mainly including main body, upper chuck assembly, reciprocating folding mechanism, synchronous linkage mechanism, tension loading mechanism, straightening and centering assembly and lower chuck assembly.A kind of corrugated board raw paper folding endurance detection device of the application, preset test tension is driven by tension loading mechanism, using the straightening and centering assembly of sliding setting in the descending process drive the clamping pressure block of lower chuck assembly automatic separation, and cooperate straightening and centering roller to paper is carried out elastic straightening and centering, subsequently by rack and pinion engagement drive synchronous linkage mechanism realizes lower end strong locking;When testing, reciprocating folding mechanism drives lower chuck to fan-shaped swing, under constant tension paper is reciprocated and bent, the application solves the problem that manual mounting and clamping are easy to incline and initial tension is uneven, improves the degree of automation and data accuracy of folding endurance detection.

The present application provides a kind of micro-coated dictionary paper and its preparation method, including beating, pulp preparation, screening, wet paper sheet papermaking, pre-drying, hard calendering, coating, post-drying and soft roll calender finishing;With 100% of absolute dry pulp as the basis, 0.2~0.4% of carboxymethyl starch is added in the beating process;The coating used in the coating process includes the following components by weight fraction: light calcium carbonate 70~90 parts, rutile titanium dioxide 10~30 parts, styrene-acrylic latex 5~8 parts, coating starch 15~20 parts, carboxymethyl cellulose 1.0~2.0 parts, lubricant 0.3~0.5 parts, water repellent 0.3~0.5 parts.The dictionary paper provided by the present application has an opacity of 88%, a transverse folding endurance of 50 or more, clear and colorful printed patterns, and is suitable for high-speed rotary printing and lithographic printing of large-format books such as dictionaries, dictionaries, manuals, tool books and classics.

The invention relates to the technical field of papermaking, in particular to ancient hemp paper and a preparation method thereof. The preparation method of the ancient hemp paper comprises the following steps: S1, pretreating raw materials to obtain dry hemp; s2, soaking; s3, cooking; s4, cleaning; s5, material cutting; s6, pounding in spring; s7, pulping; and S8, papermaking: dehydrating and drying the paper formed by papermaking to obtain the ancient hemp paper. The hemp fibers are modified by adopting the sodium carbonate-hydrogen peroxide synergistic soaking process, the folding strength, the tearing index, the whiteness and the anti-aging performance of the obtained hemp paper are remarkably superior to those of existing conventional hemp paper, and unification of high strength, high whiteness and long service life is achieved.

The invention discloses a polyhydroxyalkanoate water-based coating composition with a multiphase structure as well as a preparation method and application of the polyhydroxyalkanoate water-based coating composition, and belongs to the technical field of macromolecular bio-based packaging materials and paper-based coating. The composition is a working solution obtained by mixing a basic solution and a water-based cross-linking agent and then adjusting the pH value and the solid content, the pH value of the working solution is 7.2-9.0, the total solid content is 25.0 wt%-50.0 wt%, and the median particle size D50 is 200-500 nm; based on the total mass of the specific non-volatile matter, the plasticizer is 5.0 wt%-7.0 wt%, the water-based cross-linking agent is 2.5 wt%-4.0 wt%, the coating auxiliary agent is 0.5 wt%-1.0 wt%, and the dry solid mass ratio of the polyhydroxyalkanoate polymer to the auxiliary resin is 22: 78-62: 38. The composition is suitable for single-layer and single-time coating of a paper-based material, and the obtained coating has good water resistance, moisture resistance and folding resistance.

The invention belongs to the technical field of papermaking, and particularly relates to special paper for a food barrel and a preparation process thereof. Wherein the basis weight of the special paper for the food barrel is 240 + / -3g / m < 2 >, the tightness is 0.76 + / -0.02 g / cm < 3 >, the interlayer bonding strength is greater than or equal to 235J / m < 2 >, the water absorption value per minute is greater than or equal to 200g / m < 2 >, the burst index is greater than or equal to 2.5 Kpa.m < 2 > / g, and the water content is 7.8-8.4%. The preparation process of the special paper for the food barrel has the beneficial effects that by controlling the ratio of the raw materials, the paper has relatively high folding resistance, so that the cracking of the food barrel during 180-degree flanging is prevented; according to the preparation process of the special paper for the food barrel, stickers are controlled in all stages, and the situation that normal operation of a paper machine is affected due to the fact that the stickers adhere to a forming net or a guide roller is prevented; gluing is not carried out in the preparation process of the special paper for the food barrel, and meanwhile, silica sol is used in a net part, so that the produced paper is high in air permeability, and the glue absorbency of the paper is further improved.

This invention discloses a surface sizing agent, its preparation method, and corrugated cardboard, belonging to the field of papermaking additives technology. To solve the problems of poor folding endurance and easy bursting of corrugated cardboard, this invention provides a surface sizing agent comprising a first modified component obtained by reacting polyvinyl alcohol with a first silane coupling agent containing epoxy groups, and a second modified component obtained by reacting nanocellulose with a second silane coupling agent containing amino groups. The preparation method includes modifying the two raw materials separately, wherein the nanocellulose is dispersed by ultrasonic treatment. Applying the sizing agent to the fold lines of the corrugated cardboard forms a double cross-linked network with both hydrogen bonds and covalent bonds on its surface, thereby significantly improving the folding endurance of the corrugated cardboard and effectively preventing bursting.

The utility model discloses a high-strength anti-cracking kraft paper board, which relates to the technical field of kraft paper boards and comprises core paper arranged in a wave shape, surface paper is compounded on the outer surface of the core paper, and the high-strength anti-cracking kraft paper board comprises a paper gasket compounded on the core part of the surface paper; the moisture absorption filler is arranged in the pores of the core paper; according to the paper board, the waterproof performance and folding resistance of the paper board can be improved through the waterproof film, the strength of the paper board can be improved through the cooperation of the non-woven fabric layer and the paper gasket so that the tear resistance of the paper board can be improved, and through the arrangement of the moisture absorption filler and the honeycomb through holes, the paper board can be conveniently pulled to recover deformation, and the paper board is convenient to use. And moisture can be guided to the moisture absorption filler while the tear resistance of the paperboard is further improved, so that the core paper is prevented from being damped and mildewed, and the strength is prevented from being influenced.

The invention provides a fiber-bonded reinforced emulsion and a preparation method thereof, and belongs to the field of papermaking additives. The preparation method of the fiber combined reinforced emulsion comprises the following steps: pre-modification, cationization treatment and emulsion preparation. According to the preparation method of the fiber combined reinforced emulsion, on the premise that an acrylamide monomer or an acrylamide component is not adopted, the bonding performance with papermaking fibers is improved, the tensile strength, bursting strength and internal bonding strength of paper are improved, and meanwhile the flexibility and folding strength of the paper are effectively improved; the anion interference resistance and the water resistance of the fiber combined reinforcing emulsion are effectively improved, and the reinforcing efficiency of the fiber combined reinforcing emulsion on paper is improved; the long-term storage stability of the fiber combined reinforced emulsion is further improved.

The utility model discloses a high-strength folding-resistant hang tag, which comprises a hang tag body, the hang tag body comprises a protective layer, a base layer and a bottom layer, the protective layer comprises a transparent protective layer, an elastic fiber reinforced layer and a macromolecule crosslinking reinforced layer, and the bottom layer comprises an antibacterial mildew-proof layer, a waterproof coating and a scratch-resistant coating. An edge flexible reinforcing strip is fixedly connected to the position, close to the outer side, in the hang tag body. According to the high-strength folding-resistant hang tag, through the multi-layer structural design of the protective layer, the protective layer comprises the transparent protective layer, the elastic fiber reinforcing layer and the macromolecule crosslinking reinforcing layer, the overall strength and folding resistance of the hang tag are greatly enhanced, and the transparent protective layer provides surface protection and prevents daily abrasion; the elastic fiber reinforced layer is made of thermoplastic polyurethane fibers, so that the hang tag is endowed with excellent elasticity and tear resistance; the high-molecular cross-linking strengthening layer utilizes a high-molecular network structure material to form a firm internal support, so that external force impact and bending deformation are effectively resisted.