180 results about "Grammage" patented technology

Disclosed is a coreless roll of a tissue paper product having a first end and a second end, and a web of tissue paper product being wound such as to define a central inner hole with the first end located on the outer side and the second end located at the inner hole, the product including a bonded first ply and a second ply, a grammage of the product being 35 to 55 g / m2, and having a Geometric Mean Tensile strength of at least 200 N / m, the first ply and the second ply being made of Conventional Wet Press (CWP) paper and embossed to be nested, the coreless roll having an outer diameter of 95 to 150 mm, an inner hole diameter of 20 to 50 mm, and a density of the coreless roll of 70 to 90 kg / m3, a caliper ratio of the roll of 40% to 70%.

Disclosed is a coreless roll of a tissue paper product having a first end and a second end, and a web of tissue paper product being wound such as to define a central inner hole with the first end located on the outer side and the second end located at the inner hole, the product including a bonded first ply and a second ply, a grammage of the product being 35 to 55 g / m2, and having a Geometric Mean Tensile strength of at least 200 N / m, the first ply and the second ply being made of Conventional Wet Press (CWP) paper and embossed to be nested, the coreless roll having an outer diameter of 95 to 150 mm, an inner hole diameter of 20 to 50 mm, and a density of the coreless roll of 70 to 90 kg / m3, a caliper ratio of the roll of 40% to 70%.

Disclosed is a coreless roll of a tissue paper product having a first end and a second end, and a web of tissue paper product being wound such as to define a central inner hole with the first end located on the outer side and the second end located at the inner hole, the product including a bonded first ply and a second ply, a grammage of the product being 35 to 55 g / m2, and having a Geometric Mean Tensile strength of at least 200 N / m, the first ply and the second ply being made of Conventional Wet Press (CWP) paper and embossed to be nested, the coreless roll having an outer diameter of 95 to 150 mm, an inner hole diameter of 20 to 50 mm, and a density of the coreless roll of 70 to 90 kg / m3, a caliper ratio of the roll of 40% to 70%.

There is provided a method of producing a paper- or linerboard having a grammage measured according to ISO 536:2019 of 170-310 g / m2 and comprising a print layer, a middle layer and a back layer, wherein the middle layer is formed from a middle layer furnish comprising at least 25% by dry weight CTMP and the back layer is formed from a back layer furnish comprising an unbleached pulp, such as an unbleached kraft pulp, said method comprising the step of subjecting a multi-layered web at a speed of at least 600 m / min to pressing in a press section comprising a first and a second double-felted shoe press nip arranged in series, wherein the total press impulse of the double-felted shoe press nips is at least 95 kPa*s, preferably at least 100 kPa*s.

The specification relates to a face (100, 200) for a direct thermal linerless label. The face (100, 200) comprises a release layer (101, 201), a thermal layer (102, 202), a pre-coat layer (103, 203), a base paper (104, 204), and a barrier layer (105, 205). The base paper (104, 204) has a grammage of from 50 to 90 g / m2 and the barrier layer (105, 205) has a coat weight (dry) of from 0.5 to 3.5 g / m2. Further, a direct thermal linerless label (210), a linerless label product roll comprising direct thermal linerless labels and a labelled item are provided. Also, use of the direct thermal linerless label (210) for labelling an item as well as a method of manufacturing a linerless label web for providing the linerless product roll are provided.

The present invention concerns a paper-based barrier multilayer packaging material structure (1) being formed as a unitary sheet and comprising from its outer surface to its inner surface, the following layers: —a polymer dispersion coating (9) having a thickness of 1 to 10 μm, —a paperboard (8) having a grammage of between 120 g / m2 and 500 g / m2, —a water-based or solvent-less adhesive (7) having a thickness of 1 to 10 μm, —a barrier metallized paper layer (MBPL) having substance weight between 30-120 g / m2, preferably 45 to 90 g / m2 and a Water Vapour Transmission Rate (WVTR) of 10 to 0.1 g / m2 / d, preferably a WVTR of 1.0 to 0.1 g / m2 / d measured at 38° C. and 90% RH, and an Oxygen Transmission Rate (OTR) comprised between 100 and 0.1 cc / m2 / d, measured at 23° C. and 50% RH, preferably an OTR comprised between 1.0 and 0.1 cc / m2 / d. —at least one layer of a polymer dispersion coating (2) having a thickness of 1 to 25 μm, preferably of 5 to 15 μm.

The invention relates to a method for preparing carbon paper by blending PVA fibers and carbon fibers into a net, and relates to the technical field of carbon paper preparation, and the method comprises the following steps: (1) respectively opening carbon fibers and water-soluble polyvinyl alcohol fibers, mixing the two fibers in proportion, carding, lapping and reinforcing to prepare a preform with the gram weight range of 60-270g / m < 2 >; (2) reducing the preform with hot water to remove polyvinyl alcohol fibers, and then drying to obtain a uniform carbon paper preform with the gram weight of 10-180g / m < 2 >; (3) impregnating the carbon paper preform in resin, drying, and performing hot press molding to obtain a carbon paper base material; and (4) performing low-temperature carbonization and high-temperature graphitization treatment on the carbon paper base material in an oxygen-free environment to obtain a carbon paper finished product. The carbon fiber web forming method has the advantages that the carbon fiber web forming difficulty is reduced, meanwhile, continuous and stable carbon web forming can be achieved, and then continuous carbon paper can be rapidly prepared.

The invention relates to a method for adjusting the basis weight of a sliver (FB) in an integrated drafting unit (1) of a carding machine (K), having an input measuring roller pair (6a, 6b) located upstream of a main drafting zone of the drafting unit and having an output measuring roller pair (15a, 15b) located downstream of the main drafting zone, the basis weight of the sliver (FB) at the input measuring roller pair (15a, 15b) forms a given parameter and the draft multiple of the draft mechanism forms an operating parameter, a change in the basis weight of the sliver (FB) at the input measuring roller pair (6a, 6b) causes a change in the operating parameter in a control unit of the carding machine (K), and the change in the basis weight of the sliver (FB) at the input measuring roller pair (6a, 6b) causes a change in the operating parameter. The change amount of the operating parameter is stored in a controller of the carding machine (K) by means of a pattern or a curve, which is formed by at least two parameters. The invention also relates to a drafting mechanism for carrying out the method.

The present disclosure relates to a tissue paper product, such as toilet paper or household towel. The tissue paper product comprises two to four plies, including at least a first ply and a second ply. The two, three or four plies are optionally bonded using an adhesive, such as a lamination glue, or a mechanical bond, such as edge embossing, to form the tissue paper product. The first and second plies are the outermost plies of the tissue paper product. If the total number of plies of the tissue paper product is 2, the tissue paper product has a grammage in the range of 24-50 g / m 2 , if the total number of plies of the tissue paper product is 3, the grammage is in the range of 34-65 g / m 2 , and if the total number of plies of the tissue paper product is 4, the grammage is in the range of 55-95 g / m 2 . The first ply is made of conventional wet press (CWP) paper and embossed with a heated embossing roll. The second ply is a structured paper ply, such as a ply made of TAD, UCTAD, eTAD, Atmos or NTT.

The application discloses a kind of non-woven binding net and net roll, belong to the technical field of net weaving.The non-woven binding net of the application, a plurality of the warp yarn is arranged along the warp direction parallelly, and weft yarn is reciprocated and extends along the warp direction between warp yarns;Warp yarn includes sheet-like first branch yarn and second branch yarn, and weft yarn is stacked between first branch yarn and second branch yarn in sheet form, and the lower surface of first branch yarn and the upper surface of second branch yarn are fixed by hot pressing and compounding;The denier of first branch yarn and second branch yarn is 350-560 denier, and the formed binding net grammage is 4.5-7.0g / m 2 , the interval of adjacent warp yarn is 10-35mm, under a certain width, the tensile force that can be carried along the warp direction is not less than 270kg, which breaks through the existing warp knitting material limit;In addition, the binding net does not have the structure of warp yarn winding, which can significantly improve the strength, and through the compounding mode, the peeling of warp yarn and weft yarn is avoided, and the material is saved.

The application relates to the technical field of filter materials, and discloses a preparation method of a deformation-resistant high-dust-carrying-capacity filter bag material, which adopts melt spinning composite treatment to composite a skeleton layer, a non-woven fabric filter layer, an electrostatic layer and a non-woven fabric filter layer into the deformation-resistant high-dust-carrying-capacity filter bag material, the method does not use a coating and an adhesive, the skeleton layer is made of modified polypropylene made of modified graphite hollow spheres and polypropylene, the grammage of the prepared skeleton layer is 30-60 g / m 2 , the thickness is 0.4-0.6 mm, and the fiber wire diameter is 40-60 mu m; after the above skeleton layer is composited with the electrostatic layer and the non-woven fabric filter layer, the stiffness of the filter material can be obviously improved, the stiffness test of the deformation-resistant high-dust-carrying-capacity filter bag material can reach 72-83 percent, and the deformation resistance is obviously enhanced.

The application discloses a kind of light and thin solvent-free silicone oil release paper manufacturing process, belong to release paper manufacturing technical field, package following steps: paper selection, primer, drying primer, spraying release agent, scanning and scraping release layer, flatten release layer, drying release layer, water recovery, release paper winding, select low, thin base paper of grammage, then lower coating dry weight is used to primer to base paper is carried out primer and drying is formed to form film layer to obtain intermediate paper, when spraying release agent, atomizer will release agent atomization into particle and be sprayed to the surface of film layer of intermediate paper, let release agent particle be evenly attached to the surface of film layer of intermediate paper, then through scraper and two flatten rollers destroy the surface tension of release agent particle, let all release agent particles be fused together, the particle size of release agent particle after atomization is smaller, can reduce the thickness of release layer, then release layer is dried, water recovery is obtained after getting light and thin release paper of low grammage, low thickness.

The invention discloses an oil-proof acrylic emulsion, which belongs to the technical field of acrylic emulsion, and the oil-proof acrylic emulsion is prepared from the following raw materials: water, styrene, butyl acrylate, acrylic acid long-chain ester, carboxyl functional monomer, hydroxyl functional monomer and crosslinking monomer. The butyl acrylate and styrene are compounded, so that the film-forming property of the oil-proof acrylic emulsion is improved, a compact coating is quickly formed after the oil-proof acrylic emulsion is coated on low-gram-weight paper, oil permeation is prevented, and the oil-proof property of the paper is enhanced; by utilizing the characteristic that the hydroxyl cross-linking monomer can react with the cross-linking monomer, the monomer polymer can further form a compact net-shaped structure, so that the oil-proof performance of the oil-proof coating is improved, and the problems of high-temperature after-tack and rolling adhesion are avoided. Besides, large-particle-size latex particles are synthesized by adopting a reactive emulsifier system, and are matched with acrylic acid long-chain ester, so that the permeation of emulsion colloidal particles is reduced, and an excellent protective coating is ensured to be formed on the surface of the paper.

The invention relates to a high-gram-weight reinforced thermoforming PET (polyethylene terephthalate) non-woven fabric and a production method, and belongs to the technical field of non-woven fabrics, the high-gram-weight reinforced thermoforming PET non-woven fabric comprises a three-layer composite structure of an upper layer, a middle layer and a lower layer, the upper layer and the lower layer are polyester bi-component spun-bonded composite air flow drafting nets, and the middle layer is polyester bi-component woven gridding cloth; the three-layer structure is made into the non-woven fabric with the gram weight of 1000-4000 g / m through cross lapping and multi-channel needling shaping. According to the high-gram-weight reinforced thermal forming PET non-woven fabric and the production method, through the unique sandwich composite structure design, the bi-component woven gridding cloth is introduced between the upper layer of bi-component spun-bonded fiber net and the lower layer of bi-component spun-bonded fiber net to serve as a reinforcing layer, and the synergistic reinforcing effect is formed; the longitudinal and transverse mechanical properties of the product are more uniform, and the tear strength and the tensile modulus are obviously improved; the tensile modulus of the product can reach 1000-4000 Mpa, the tearing strength can reach 230-1500 N, the tensile strength after thermoplastic forming is 30-120 N / mm, and various mechanical indexes are improved by 50% or above compared with traditional non-woven fabric.

The composite device comprises a front waistline part, a rear waistline part and a core layer, the rear waistline part is arranged at the tail end of the front waistline part, and the core layer is arranged between the front waistline part and the rear waistline part. Each of the front waistline part and the rear waistline part comprises a surface layer, a bottom layer and a staggered composite light elastic component arranged between the surface layer and the bottom layer, the staggered composite light elastic component can be compounded by two layers of materials, the interval between adjacent rubber bands is 2-2.45 mm, the three layers of materials are compounded by the rubber bands in a staggered manner, the interval between the adjacent rubber bands is 2-2.45 mm, and each non-woven fabric has the basis weight smaller than 6 g / m < 2 >. According to the non-woven fabric, the requirement for the precision of a spraying device during manufacturing is lowered, so that the spraying cost and difficulty in the manufacturing process are reduced, meanwhile, the gram weight of the non-woven fabric is small, the overall weight is reduced, after the non-woven fabric is manufactured into hygienic products, the overall weight can be reduced, and the use comfort level is enhanced.

A packaging wrap (10) for a disposable hygiene article (78) is disclosed. The packaging wrap comprises an elongated sheet (12) having a first and a second folding axis (26; 28) dividing the elongated sheet into a first end region (30), a second end region (32) and a central region (34) between the first end region (30) and the second edge region (32). The elongated sheet (12) has a first side edge zone (36) and a second side edge zone (38). The packaging wrap (10) further comprises strips of adhesive in the first and second side edge zones (36, 38). The strips of adhesive including a first pair of strips of adhesive (40) in the first end region (30), a second pair of strips of adhesive (42) in the second end region (32), and a central pair of strips of adhesive (44) in the central region (34), with each strip of the pair of strips having a width (ws) extending in a transverse direction (T) from its respective longitudinal edge. The first pair of strips of adhesive (40) has a first grammage, the second pair of strips of adhesive (42) has a second grammage, and the central pair of strips of adhesive (44) has a third grammage, the third grammage being less than said first and second grammage.

The invention relates to a device for applying a dry film (003) to a web-like carrier substrate (006), comprising at least one first application unit (101), which comprises a first roller (102) and a second roller (103), which rotates counter to the first roller (102) according to the operating situation and forms a first gap (104) with the first roller, and a first pressing roller (103 '; 106), which is connected to the second roller (103) or arranged between the first pressing roller (103 '; 106) and a further roller between the second roller (103) together form a second gap (107), through which a substrate path for the carrier substrate (006) to be coated is guided, and a measuring device (413) for measuring the gram weight (FG) of the dry film (003), which measuring device comprises sensor means (413.1; 413.2) for adjusting the gap width (b104) of the first gap (104) and / or for adjusting the gap width (b104) of the first roller (102; 103) in the direction of the second roller (103) is provided with an adjustment drive (109; 111) for rotationally driving the first or second roller (102; 103) for driving at least the rotation of the first or second roller (102; 103) and a drive mechanism (148; 149) of the measuring device (143), the sensor means (413.1; 413.2) as a control circuit (RFG; 413.2) for controlling the gram weight (FG). R 'FG) is held in signal connection with a control and / or regulation device (156), which is designed to control the control and / or regulation device (156) on the basis of the basis weight (FG) determined by the measuring device (143) via a signal connection with the adjustment drive (109; 132) for driving a drive mechanism (132; 155) to vary the gap width (b104) of the first gap (104) and / or via a signal connection with the first or second roller (102; 103) and a drive mechanism (148; 149) for changing the ratio between the circumferential speed V (102) of the first roller (102) and the circumferential speed V (103) of the second roller (103), and further relates to a method for applying a dry film (003) to a web-shaped carrier substrate (008).

An image forming apparatus includes a transfer unit, a fixing unit, a conveyance unit, and a control unit. The control unit selectively performs a plurality of modes including a first mode and a second mode. The first mode is a mode in which, when a grammage of a sheet is a first grammage, if a leading edge of the sheet has reached the fixing unit, the control unit controls the first suction unit such that suction force of the first suction unit becomes first suction force. The second mode is a mode in which, when the grammage of the sheet is a second grammage smaller than the first grammage, if a leading edge of the sheet has reached the fixing unit, the control unit controls the first suction unit such that the suction force of the first suction unit becomes second suction force smaller than the first suction force.

The application relates to a composite film material, a urea-formaldehyde product and a preparation method thereof, and a toilet bowl. The composite film material comprises a modified film material, the modified film material comprises a reinforcing cloth and a PVB matrix coated on the surface of the reinforcing cloth and filled in the reinforcing cloth, the total thickness of the modified film material is 0.1mm-2mm, the modified film material is provided with a plurality of through holes arranged in the thickness direction, and the diameter of each through hole is 1mm-5mm; the grammage of the reinforcing cloth is 10g / m 2 ~120g / m 2 ; the material for preparing the PVB matrix comprises PVB 85-92 parts and a plasticizer 8-15 parts in mass fraction, the total mass fraction of the PVB and the plasticizer is 100 parts, and the viscosity of a 10% PVB ethanol solution at 20 DEG C is 30s-120s. The composite film material has high hardness and high impact resistance, is applied in the urea-formaldehyde product, and is favorable for improving the impact resistance of the urea-formaldehyde product.

The utility model discloses a warm paste structure which comprises a packaging bag and a warm paste unit packaged in the packaging bag, and the warm paste unit sequentially comprises a stiff breathable film layer, a heating layer, a low-gram-weight breathable film layer, an adhesive layer and a release paper layer from top to bottom. The warm paste structure has the advantages of being high in air permeability, good in heating effect, firm in contact with the skin and comfortable in contact when in use.

The invention relates to the technical field of folder production, and discloses an ultralow-gram-weight paper covering process which comprises the following steps: step 1, unwinding: putting ultralow-gram-weight toilet paper on an unwinding device, and carrying out tension control at 0.5-2 N; the PP material is heated to be in a molten state, the PP material is extruded into base cloth through an extruder, and the extrusion speed is controlled to be 10-20 m / min. 3, preheating, wherein the toilet paper with the ultralow gram weight is preheated. And 4, compounding: compounding the base cloth in the molten state and the preheated toilet paper with the ultralow gram weight through two extrusion rollers which are arranged left and right, wherein the compounding pressure is controlled to be 0.3-0.6 MPa. And 5, cooling: cooling the compounded surface paper through a cooling roller, and controlling the cooling temperature to be 50-60 DEG C. And 6, rolling, wherein the cooled surface paper is rolled. The technology can effectively solve the technical problems in the ultra-low gram weight toilet paper covering paper processing, and the prepared product has the advantages of being light in weight, environmentally friendly and the like.

The application discloses a kind of low gram weight's solvent-free silicone oil release paper manufacturing method, belong to release paper manufacturing technical field, including the steps of papermaking, primer, drying primer, coating release agent, drying release agent, water recovery, release paper is wound, the application is based on thermoplastic fiber silk heating to certain temperature can be repeatedly reshaped and the characteristics of setting, the process of papermaking is stretched by the speed difference of conveying before paper forming to obtain low gram weight base paper, then primer is carried out to base paper, after coating release agent, low gram weight release paper is obtained, since thermoplastic fiber silk has higher strength and toughness than plant fiber after solidification, the release paper of the application has better mechanical strength than the release paper of same gram weight or even higher gram weight, the release paper of the application can reduce the addition amount of pulp in the process of papermaking, realize higher environmental protection, and the gram weight and thickness of release paper are lower, can reduce the cost of release paper transportation.

An aerosol generating article (10) includes an aerosol generating substrate (12) comprising nicotine and a first paper layer (50) disposed about the aerosol generating substrate. The first paper layer has a first thickness / grammage value. A second paper layer (20) is disposed about the first paper layer. The second paper layer has a second thickness / grammage value. The first thickness / grammage value is less than the second thickness / grammage value.

The utility model relates to a kind of composite membranes for vacuum bag compression molding, the composite membranes for vacuum bag compression molding include demoulding layer, first glue point adhesive layer, isolation layer, second glue point adhesive layer and air-permeable felt layer which are sequentially laminated;The grammage of the first glue point adhesive layer and the second glue point adhesive layer is independently 4~7g / m 2 ;In vacuum bag compression molding, the composite membranes for vacuum bag compression molding of the utility model can be laid once, save time, help to vacuum, improve the surface quality of product, have good flatness, easy demoulding.

The present invention relates to paper or paperboard comprising cellulose fibers, said paper or paperboard comprising at least one coating layer formed by extrusion coating of a PP (polypropylene) resin, characterized in that the PP resin comprises at least 50% by weight of a branched PP copolymer having a density in the range of 890-910 kg / m3 (as determined according to ISO 1183), a melting temperature in the range of 155-170° C. (as determined according to ISO 11357-3), and a melt flow rate (230° C. / 2.16 kg) in the range of 10-15 g / 10 min (as determined according to ISO 1133), and wherein the PP resin is applied to the paper or paperboard at a grammage of less than 30 g / m2.

The utility model belongs to the technical field of automation control, and discloses a product gram weight slurry feeding time control device which comprises a bottom plate, a weighing platform is arranged on the bottom plate, a slurry storage container is arranged on the weighing platform, a supporting frame is arranged on the outer side of the slurry storage container, a stirring assembly is installed on the supporting frame, and the stirring assembly is arranged on the bottom plate. The stirring assembly is connected with the slurry conveying assembly, the weighing table monitors the gram weight change of slurry in the slurry storage container in real time so as to accurately control the conveyed slurry amount, and the stirring assembly and the slurry conveying assembly are combined so as to reduce extra occupation of the internal space of the slurry storage container and achieve efficient and stable slurry conveying. And the flushing assembly is combined with the stirring assembly and the slurry conveying assembly, so that occupation of the internal space of the slurry storage container is further reduced, the effect of flushing the inner wall of the slurry storage container is achieved, and the situation that residual slurry affects the quality of the slurry stored next time is avoided.

The invention discloses a mechanical fastening belt and a manufacturing method thereof, and relates to the technical field of mechanical fastening belts. The hook surface is compounded and fixed on the surface of one side of one end in the length direction of the base film through thermal forming; the base film is a modified base film added with a composite foaming system, and the composite foaming system is formed by compounding a physical foaming agent and a chemical foaming agent; the physical foaming agent is hollow glass beads, and the chemical foaming agent is azodicarbonamide. A composite foaming system formed by compounding hollow glass beads and azodicarbonamide is adopted in the base film, and the hook surface is compounded and fixed on the surface of one side of one end of the length direction of the base film through thermal forming, so that the uniformity of an internal bubble structure of the base film is improved; the problems that a traditional mechanical fastening belt is too high in gram weight, high in material cost and poor in use flexibility due to a single foaming system of a base film, and the compounding firmness of a hook face and the base film is insufficient can be solved.

Disclosed in the present invention are a paper substrate and a preparation method therefor, and a paper-based flexible package. The preparation method for the paper substrate comprises: carrying out pulping, refining and blending on softwood pulp and hardwood pulp to form pulp with a concentration of 0.1-0.6%; adding epoxy resin modified polyacrylate at 5-15 kg / per ton of bone-dry pulp, a rosin size at 0.2-2 kg / per ton of bone-dry pulp, and a wet strength agent at 30-80 kg / per ton of bone-dry pulp; and carrying out papermaking, drying, creping and winding. The paper-based flexible package comprises a package body; the package body is enclosed by a paper substrate to form a hollow cavity, comprising two end sealing portions and front and rear sealing portions; the two end sealing portions and the front and rear sealing portions are connected by means of a plurality of bonding layers; and the bonding layers are formed by the interlocking of plant fibers and polyacrylate. The paper substrate obtained in the present invention has the required heat-sealing properties and strength even at low grammage, ensuring the flexibility of the substrate and facilitating automated continuous production of devices.

The invention relates to the technical field of textiles, and discloses a preparation process of a light-weight environment-friendly automotive trim non-woven fabric. According to the process, three layers of fiber components including regenerated polyester, bio-based polyester and natural fibers are prepared; a sandwich structure is constructed by adopting multi-guide-bar parallel net forming, online electrostatic spinning is performed on a bio-based microporous membrane between layers, and low-melting-point hot melt adhesive powder is applied; and after needling reinforcement and gradient hot air curing are conducted, far infrared preheating is combined with a cold pressing mold for hot punching forming. While the gram weight is reduced, the sound absorption coefficient is improved, and the sound absorption material has excellent flame retardance, self-cleaning performance and full-life-cycle closed-loop recycling capacity.

The invention provides a preparation method of insulating flat paper for a high voltage grade, which belongs to the technical field of insulating product production and comprises the following steps: removing iron from slurry with the mass percentage concentration of 3-4%, adding the slurry into hydrochloric acid, stirring, washing until the mass percentage concentration is 3-4%, adding magnesium bicarbonate, stirring, and drying to obtain the insulating flat paper for the high voltage grade. The preparation method comprises the following steps: stirring, washing, deslagging, pulping and deironing, diluting to the mass percentage concentration of 0.3%-0.8%, purifying, carrying out jet molding at the linear velocity ratio of (1.1-1.7): 1 to obtain wet paper, controlling the gram weight of the wet paper to be 50-200gsm, carrying out vacuum suction dehydration and squeezing, drying to the dryness of 55-65% to form semi-wet paper, and squeezing and drying again to form the finished product flat paper. The use amount of hydrochloric acid is 0.5%-1.5% of the mass fraction of the slurry, and the addition amount of magnesium bicarbonate is 2%-2.5% of the mass fraction of the slurry, so that the technical problems that pure slurry is easily polluted and the phenomenon of breakdown caused by insufficient electric strength still occurs under high voltage in the existing flat paper preparation method are solved.