Production method of functional oil-absorbing surface paper

Abstract

The invention provides a production method of functional oil-absorbing surface paper, which comprises the following steps: step 1, mixing pulped wood pulp fibers and light calcium carbonate, carrying out papermaking molding treatment, and then sequentially carrying out squeezing dehydration and primary drying treatment; 2, coating treatment is conducted on the paper sheet subjected to primary drying treatment through a coating preparation containing microcapsules; and step 3, sequentially carrying out secondary drying, reeling and super calendering treatment on the coated paper sheet to obtain the oil-absorbing surface paper. The invention aims to enhance the oil absorption function of the traditional oil absorption surface paper, and meanwhile, various functional microcapsule substances are loaded on the surface of the oil absorption surface paper, so that various additional functions can be realized on the premise of meeting high ash content, high tensile strength and other technical indexes of the oil absorption surface paper at the same time; therefore, various individual requirements of different oil-absorbing surface paper using groups can be met.

Description

Technical Field

[0001] The invention relates to the technical field of papermaking, and in particular to a method for producing functional oil-absorbing facial paper. Background Art

[0002] The traditional production of oil-absorbing facial paper uses wood pulp fiber as raw material and is made by papermaking on a paper machine. Due to the limitations of the production process, it is difficult to add other functional components inside or on the surface of the paper to achieve various new functions. In addition, the traditional oil-absorbing facial paper only absorbs facial oil into the fiber pores through the capillary action of the wood pulp fiber in the paper, thereby achieving the facial oil absorption function, but the oil absorption effect is relatively limited and the function is single. In addition, the ash content of existing oil-absorbing facial paper is generally below 10%, and the longitudinal tensile strength is 1.0-0.8 kN / m. If the ash content of the oil-absorbing facial paper is increased, the longitudinal tensile strength will be further reduced, and it is very easy to break the paper when the paper roll is rewound and cut. It cannot meet the requirements of high ash content and high longitudinal tensile strength at the same time, and it cannot meet the higher requirements of people for oil-absorbing facial paper. Summary of the invention

[0003] The present invention aims to enhance the oil absorption function of traditional oil-absorbing facial paper, and at the same time, provides a production method of functional oil-absorbing facial paper by loading various functional microcapsule substances on the surface of the oil-absorbing facial paper. While meeting the high ash content and high tensile strength and other technical indicators of the oil-absorbing facial paper, various additional functions can also be achieved to meet the various personalized needs of different oil-absorbing facial paper user groups.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] In a first aspect, the present invention provides a method for producing a functional oil-absorbing facial paper, comprising the following steps:

[0006] Step 1, mixing the pulped wood pulp fibers and light calcium carbonate for papermaking and forming, and then sequentially subjecting the mixture to pressing, dehydration and primary drying; the wood pulp fibers are composed of coniferous pulp fibers and broadleaf pulp fibers;

[0007] Step 2, coating the paper sheet after the primary drying process with a coating preparation containing microcapsules; the coating preparation containing microcapsules is formed by coating microcapsules with a polysaccharide solution; the polysaccharide is selected from at least one of oxidized starch, dextrin, maltodextrin, hydroxypropyl starch, and sodium carboxymethyl cellulose;

[0008] Step 3, subjecting the coated paper sheet to secondary drying, winding and super calendering in sequence to obtain the oil-absorbing facial tissue.

[0009] Preferably, in step 1, the composition of the wood pulp fibers in terms of weight percentage is: 30-70% coniferous pulp fibers and 30-70% hardwood pulp fibers, wherein the mass concentration of the coniferous pulp fibers and the hardwood pulp fibers is 2.5-4.5%.

[0010] Preferably, the beating conditions of the coniferous pulp fibers are: a beating concentration of 3.0%-5.0%, and a beating degree of 80°SR-90°SR; and / or, the beating conditions of the broadleaf pulp fibers are: a beating concentration of 3.0%-5.0%, and a beating degree of 55°SR-65°SR.

[0011] Preferably, in step 1, the light calcium carbonate is light solid calcium carbonate or light liquid calcium carbonate, and the absolute dry added amount of the light calcium carbonate accounts for 20-40% of the absolute dry weight of the mixed pulp; and / or, the papermaking and forming process adopts a fourdrinier paper machine, and further preferably, the web concentration is 0.1-1.0%; and / or, the control parameters of the primary drying process are: temperature 90-110°C, drying to a paper sheet moisture content of 3.0-5.0%.

[0012] Preferably, in step 2, the coating preparation containing microcapsules comprises, by mass percentage, 4-8% polysaccharide, 10-40% microcapsules, 0-10% dye, and the balance water; and / or, the coating treatment method is dip coating, and further preferably, the coating amount is 0.8-1.5 g / m 2 .

[0013] Preferably, the microcapsules are formed by encapsulating functional ingredients that can be used for facial care through wall materials, and the functional ingredients are plant extracts.

[0014] Preferably, the method for preparing the coating formulation containing microcapsules comprises the following steps:

[0015] Step 1), preparing a polysaccharide solution with water, and gelatinizing at 90-95°C for 30-60 minutes;

[0016] Step 2), lowering the temperature of the gelatinized oxidized starch solution to 40-50° C., adding microcapsules and dyes, and obtaining the coating preparation.

[0017] Preferably, in step 3, the control parameters of the secondary drying treatment are: temperature 90-115°C, drying to a semi-dry paper sheet with a moisture content of 3.0-6.0%; and / or, the control parameters of the super calendering treatment are: temperature 55°C-75°C, pressure 60kN / m-80kN / m, and vehicle speed 180m / min-220m / min.

[0018] In a second aspect, the present invention provides a functional oil-absorbing facial paper obtained by the production method described in the first aspect.

[0019] Preferably, the functional oil-absorbing facial paper has a thickness of ≥30 μm, a longitudinal tensile strength of ≥0.80 kN / m, a smoothness of a smooth surface of ≥450 s, a smoothness of a rough surface of ≥130 s, and an ash content of ≥13%.

[0020] Compared with the prior art, the technical effects of the present invention are:

[0021] The present invention provides a method for producing functional oil-absorbing facial paper. While enhancing the oil absorption function of traditional oil-absorbing facial paper, various functional microcapsule substances are loaded on the surface of the oil-absorbing facial paper, which can not only meet the requirements of high ash content and high tensile strength and other technical indicators of the oil-absorbing facial paper, but also realize various additional functions, thereby meeting the various personalized needs of different groups of oil-absorbing facial paper users. Experimental detection shows that the oil-absorbing facial paper of the present invention has the dual effects of "oil absorption + oil control". In addition, it can also produce new effects such as anti-inflammatory, acne removal, moisturizing, refreshing, refreshing, aromatherapy, etc. according to the added functional ingredients. The present invention breaks the traditional mode that the oil-absorbing facial paper only has a single oil absorption effect, and greatly improves the traditional production process, giving it more new functions on the premise of further optimizing the technical indicators of the oil-absorbing facial paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a physical picture of the finished product of the oil-absorbing facial paper of Examples 1 to 6 of the present invention. DETAILED DESCRIPTION

[0023] In the embodiment of the present invention, the fiber raw materials, auxiliary materials and additives used are specifically:

[0024] (1) The control index of fiber raw materials entering the factory is: using imported coniferous and hardwood pulp fibers as raw materials, where the coniferous pulp fiber length is ≥ 2.0 mm, and the coniferous pulp fiber breaking length is ≥ 8.0 km (quantitative 60 g / m 2 , beating degree 45°SR); hardwood pulp fiber length ≥ 0.7mm, hardwood pulp fiber breaking length ≥ 5.6Km (quantity 60g / m 2 , beating degree 45°SR);

[0025] (2) The auxiliary material is liquid calcium carbonate: 2.0 ml / g ≤ apparent specific volume ≤ 4.0 ml / g, 3.0 μm ≤ volume average particle size ≤ 5.0 μm; commercially available light calcium carbonate can also be used.

[0026] (3) Additives: microcapsule materials containing different functional material components (core materials), the particle size of the microcapsule is 5μm≤≤200μm, and the capsule wall thickness of the microcapsule is 0.5μm≤≤10μm; the material components of the wall material are gelatin and gum arabic; the material added to the microcapsule (core material) is a plant extract, including but not limited to organic acids (such as tannic acid), aloe vera extract, wind oil, natural plant fragrances, various essential oils, menthol, marshmallow root extract, Centella asiatica extract, ginkgo leaf extract, motherwort extract, pomegranate extract, rhodiola rosea extract, licorice extract, corn silk extract, damiana extract, red date extract, ginseng extract, etc.

[0027] (4) Oxidized starch: 5cp≤viscosity≤30cp (concentration 8%, 25°C);

[0028] (5) Dyes: Cardasso red dye, Cardasso yellow dye, Cardasso blue dye, the supplier is a certain trading company in Jinan.

[0029] It should be further noted that, in the examples of the present invention, if no specific conditions are specified, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used, if no manufacturer is specified, are all conventional products that can be purchased commercially.

[0030] A specific embodiment of the present invention provides a method for producing a functional oil-absorbing facial paper, which specifically comprises the following steps:

[0031] Step 1: Preparation of fiber raw materials

[0032] The needle pulp and hardwood pulp fibers are broken down by a hydraulic pulper at a concentration of 5% to 8% respectively, so that the fibers are completely broken down and dispersed.

[0033] The completely broken and dispersed needle pulp and broadleaf pulp fibers are circulated and beaten by a double-disc refiner, and the beating concentration is 3.0%-5.0%. The beating degree of needle pulp fiber is 80°SR-90°SR, and the wet weight of needle pulp fiber is 8g-12g. The beating degree of broadleaf pulp fiber is 55°SR-65°SR, and the wet weight of broadleaf pulp fiber is 0.5g-3g.

[0034] After beating of needle and broadleaf pulp fibers, the pulp is mixed and prepared. The pulp concentration of needle and broadleaf pulp fibers is 2.5%-4.5%, the proportion of needle pulp fibers is 30%-70%, and the proportion of broadleaf pulp fibers is 70%-30%.

[0035] Step 2: Using a Fourdrinier paper machine to produce oil-absorbing facial tissue containing microcapsule substances

[0036] A certain proportion of light liquid calcium carbonate (or light solid calcium carbonate) is added to the mixed pulp after the needle and broadleaf pulp fibers are mixed and prepared. The addition ratio of light liquid calcium carbonate (or light solid calcium carbonate) is 20%-40% (the absolute dry addition amount accounts for the absolute dry weight of the mixed pulp). After being fully mixed, it is washed and diluted and then put on the net. The concentration of the net is 0.1%-1.0%. After being dehydrated and formed in the net part, it enters the pressing part for pressing and dehydration. The pressing pressure is 0.3-0.8Mpa. Then it enters the pre-drying part and is further dried and dehydrated by the drying cylinder. The drying temperature of the drying cylinder is 90℃-110℃. The moisture content of the paper sheet after the pre-drying part is 3.0%-5.0%. Then it enters the application part for dip coating. The coating amount is 0.8-1.5g / m 2 .

[0037] The coating aids include polysaccharides, microcapsules containing different functional material components (core materials), red dyes, yellow dyes, and blue dyes. The polysaccharides are selected from at least one of oxidized starch, dextrin, maltodextrin, hydroxypropyl starch, and sodium carboxymethyl cellulose.

[0038] Preparation of coating aids: prepare polysaccharide material at a final mass concentration of 4%-8%, gelatinization temperature of 90℃-95℃, gelatinization insulation time of 30min-60min. Then add microcapsule material containing different functional material components (core material) according to process requirements, the final mass concentration of microcapsule material is 10%-40%, and then add red dye, yellow dye, and blue dye. The final mass concentration of dye is 0%-10%, and the balance is water.

[0039] After coating, the paper enters the post-drying section and is dried and dehydrated again through the drying cylinder. The drying temperature of the drying cylinder is 90℃-115℃. The moisture content of the paper sheet after the post-drying section is 3.0%-6.0%, and then enters the winding section to be wound to obtain the semi-finished oil-absorbing facial paper containing microcapsule substances.

[0040] Step 3: Supercalendering of oil-absorbing facial tissue containing microcapsule substances

[0041] In view of the special requirements of oil-absorbing facial paper for high smoothness and touch, the semi-finished oil-absorbing facial paper containing microcapsule substances produced needs to be super-calendered again. The temperature of the super calender is 55℃-75℃, the pressure of the super calender is 60kN / m-80kN / m, and the speed of the super calender is 180m / min-220m / min. The smoothness of the glossy surface of the oil-absorbing facial paper after super calendering is ≥400s, and the smoothness of the rough surface is ≥120s. The semi-finished oil-absorbing facial paper containing microcapsule substances is super-calendered to obtain the final product.

[0042] The technical scheme of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but the following examples are limited to a part of the research of the present invention and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on this, other embodiments obtained by ordinary technicians in this field without making creative work are all within the scope of protection of the present invention. In addition, some microcapsules are disclosed in the embodiments, among which the commercial model of tannic acid microcapsules is WJN-1, the commercial model of aloe extract microcapsules is WJN-2, the commercial model of menthol microcapsules is WJN-3, and the commercial model of rose essence microcapsules is WJN-4, all of which are purchased from Yunnan Science and Technology Co., Ltd. These microcapsules disclosed in the embodiments are only used as examples to illustrate the present invention and should not be regarded as limiting the scope of the microcapsules of the present invention.

[0043] Example 1

[0044] This embodiment provides a 18g / m 2 The production process of brown oil-absorbing facial paper with oil-control function comprises the following steps:

[0045] (1) Pulping. The needle pulp and broadleaf pulp fibers were respectively passed through a hydraulic pulper at a rate of 6% to be dispersed until the fibers were completely dispersed, and then circulated through a double-disc refiner for pulping. The beating concentration of the needle pulp fibers was 4.0%, the beating degree of the needle pulp fibers was 85°SR, and the wet weight of the needle pulp fibers was 9.5 g. The beating concentration of the broadleaf pulp fibers was 4.0%, the beating degree of the broadleaf pulp fibers was 58°SR, and the wet weight of the broadleaf pulp fibers was 1 g.

[0046] (2) Pulping. The pulping concentration of coniferous pulp and broadleaf pulp is 2.8%, with coniferous pulp fiber at 45% and broadleaf pulp fiber at 55%. Then, liquid calcium carbonate (light calcium carbonate) is added to the mixed pulp, and the absolute dry weight of the liquid calcium carbonate (light calcium carbonate) accounts for 25% of the absolute dry weight of the mixed pulp.

[0047] (3) Papermaking is done by a fourdrinier paper machine. The mixed pulp with liquid calcium carbonate (light calcium carbonate) is diluted by pulping and then put on the net. After being dehydrated and formed by the fourdrinier paper machine, it enters the pressing section for pressing and dehydration. The pressing pressure is 0.45Mpa. Then it enters the pre-drying section and is dried by multiple groups of pre-drying cylinders. The drying temperature of the drying cylinders is 90℃-115℃. The moisture content of the paper sheet after the pre-drying section is 3.0%-5.0%. Then it enters the coating section for coating. The coating method is dip coating, and the coating amount is 1.1g / m 2The coating aids include 6% oxidized starch; 3.5% dye, wherein red dye: yellow dye: blue dye = 10%: 30%: 60%; 20% tannic acid microcapsules. The coated paper sheet enters the post-drying section and is dried by multiple groups of post-drying cylinders. The drying temperature of the drying cylinders is 90℃-115℃. The moisture content of the paper sheet entering the take-up section after passing through the post-drying section is 3.0%-6.0%.

[0048] (4) Super calendering: Use a super calender to calender the 18g / m2 2 The semi-finished brown oil-absorbing facial paper with oil control function is super calendered, the temperature of the super calender is 60°C, the pressure of the super calender is 65kN / m, and the speed of the super calender is 200m / min. The smoothness of the glossy surface of the oil-absorbing facial paper after super calendering is ≥400s, and the smoothness of the rough surface is ≥120s. Thus, the finished oil-absorbing facial paper of the above product is obtained, and the specific indicators are shown in Table 1.

[0049] Example 2

[0050] This embodiment provides a 20g / m 2 The production process of dark grey oil-absorbing facial paper with anti-inflammatory, acne-removing and moisturizing functions comprises the following steps:

[0051] (1) Pulping. The needle pulp and broadleaf pulp fibers were respectively passed through a hydraulic pulper at a rate of 6% to be dispersed until the fibers were completely dispersed, and then circulated through a double-disc refiner for pulping. The beating concentration of the needle pulp fibers was 4.0%, the beating degree of the needle pulp fibers was 85°SR, and the wet weight of the needle pulp fibers was 9.5 g. The beating concentration of the broadleaf pulp fibers was 4.0%, the beating degree of the broadleaf pulp fibers was 56°SR, and the wet weight of the broadleaf pulp fibers was 1.2 g.

[0052] (2) Pulping. The pulping concentration of coniferous pulp and broadleaf pulp is 2.8%, with the coniferous pulp ratio being 42% and the broadleaf pulp ratio being 58%. Then, liquid calcium carbonate (light calcium carbonate) is added to the prepared mixed pulp, and the absolute dry amount of liquid calcium carbonate (light calcium carbonate) added accounts for 25% of the absolute dry weight of the mixed pulp.

[0053] (3) Papermaking is done by a fourdrinier paper machine. The mixed pulp with liquid calcium carbonate (light calcium carbonate) is diluted by pulping and then put on the net. After being dehydrated and formed by the fourdrinier paper machine, it enters the pressing section for pressing and dehydration. The pressing pressure is 0.45Mpa. Then it enters the pre-drying section and is dried by multiple groups of pre-drying cylinders. The drying temperature of the drying cylinders is 90℃-115℃. The moisture content of the paper sheet after the pre-drying section is 3.0%-5.0%. Then it enters the coating section for coating. The coating method is dip coating and the coating amount is 1.2g / m 2; Coating aids include 6% oxidized starch; 3.3% dye, of which red dye: yellow dye: blue dye = 9.2%: 28.3: 62.5%; 25% aloe extract microcapsules. The coated paper sheet enters the post-drying section and is dried by multiple groups of post-drying drying cylinders. The drying temperature of the drying cylinders is 90℃-115℃. The moisture content of the paper sheet entering the take-up section after passing through the post-drying section is 3.0%-6.0%.

[0054] (4) Super calendering: Use a super calender to calender the 20g / m2 2 The semi-finished dark gray oil-absorbing facial paper with anti-inflammatory, acne-removing and moisturizing functions is super-calendered, the temperature of the super-calender is 60°C, the pressure of the super-calender is 65kN / m, and the speed of the super-calender is 200m / min. The smoothness of the glossy surface of the oil-absorbing facial paper after super-calendering is ≥400s, and the smoothness of the rough surface is ≥120s. Thus, the finished oil-absorbing facial paper of the above product is obtained, and the specific indicators are shown in Table 1.

[0055] Example 3

[0056] This embodiment provides a 18g / m 2 The production process of the pink oil-absorbing facial paper with refreshing function comprises the following steps:

[0057] (1) Pulping. The needle pulp and broadleaf pulp fibers were respectively passed through a hydraulic pulper at a rate of 6% to be dispersed until the fibers were completely dispersed, and then circulated through a double-disc refiner for pulping. The beating concentration of the needle pulp fibers was 4.0%, the beating degree of the needle pulp fibers was 87°SR, and the wet weight of the needle pulp fibers was 9 g. The beating concentration of the broadleaf pulp fibers was 4.0%, the beating degree of the broadleaf pulp fibers was 56°SR, and the wet weight of the broadleaf pulp fibers was 1 g.

[0058] (2) Pulping. The pulping concentration of coniferous pulp and broadleaf pulp is 2.8%, with coniferous pulp fiber at 45% and broadleaf pulp fiber at 55%. Then, liquid calcium carbonate (light calcium carbonate) is added to the mixed pulp, and the absolute dry weight of the liquid calcium carbonate (light calcium carbonate) accounts for 27% of the absolute dry weight of the mixed pulp.

[0059] (3) Papermaking is done using a fourdrinier paper machine. The mixed pulp with liquid calcium carbonate (light calcium carbonate) is diluted by pulping and then put on the net. After being dehydrated and formed by the fourdrinier paper machine, it enters the pressing section for pressing and dehydration. The pressing pressure is 0.45Mpa. Then it enters the pre-drying section and is dried by multiple groups of pre-drying cylinders. The drying temperature of the drying cylinders is 90℃-115℃. The moisture content of the paper sheet after passing through the pre-drying section is 3.0%-5.0%. Then it enters the coating section for coating. The coating method is dip coating, and the coating amount is 1.0g / m 2; Coating aids include 6% oxidized starch; 0.5% dye, all red dye; 23% menthol microcapsules. The coated paper enters the post-drying section and is dried by multiple groups of post-drying cylinders. The drying temperature of the drying cylinders is 90℃-115℃. The moisture content of the paper entering the take-up section after passing through the post-drying section is 3.0%-6.0%.

[0060] (4) Super calendering: Use a super calender to calender the 18g / m2 2 The semi-finished pink oil-absorbing facial paper with refreshing function is super calendered, the temperature of the super calender is 60°C, the pressure of the super calender is 65kN / m, and the speed of the super calender is 200m / min. The smoothness of the smooth surface of the oil-absorbing facial paper after super calendering is ≥400s, and the smoothness of the rough surface is ≥120s. Thus, the finished oil-absorbing facial paper of the above product is obtained, and the specific indicators are shown in Table 1.

[0061] Example 4

[0062] This embodiment provides a 18g / m 2 The production process of purple oil-absorbing facial paper with rose fragrance comprises the following steps:

[0063] (1) Pulping. The needle pulp and broadleaf pulp fibers were respectively passed through a hydraulic pulper at a rate of 6% to be dispersed until the fibers were completely dispersed, and then circulated through a double-disc refiner for pulping. The beating concentration of the needle pulp fibers was 4.0%, the beating degree of the needle pulp fibers was 83°SR, and the wet weight of the needle pulp fibers was 9.5 g. The beating concentration of the broadleaf pulp fibers was 4.0%, the beating degree of the broadleaf pulp fibers was 55°SR, and the wet weight of the broadleaf pulp fibers was 1 g.

[0064] (2) Pulping. The pulping concentration of coniferous pulp and broadleaf pulp is 2.8%, with coniferous pulp fiber at 45% and broadleaf pulp fiber at 55%. Then, liquid calcium carbonate (light calcium carbonate) is added to the mixed pulp, and the absolute dry weight of the liquid calcium carbonate (light calcium carbonate) accounts for 25% of the absolute dry weight of the mixed pulp.

[0065] (3) Papermaking is done by a fourdrinier paper machine. The mixed pulp with liquid calcium carbonate (light calcium carbonate) is diluted by pulping and then put on the net. After being dehydrated and formed by the fourdrinier paper machine, it enters the pressing section for pressing and dehydration. The pressing pressure is 0.45Mpa. Then it enters the pre-drying section and is dried by multiple groups of pre-drying cylinders. The drying temperature of the drying cylinders is 90℃-115℃. The moisture content of the paper sheet after the pre-drying section is 3.0%-5.0%. Then it enters the coating section for coating. The coating method is dip coating, and the coating amount is 1.1g / m 2; Coating aids include 6% oxidized starch; 0.35% dye, of which red dye: yellow dye: blue dye = 14%: 4%: 82%; 25% rose essence microcapsules. The coated paper enters the post-drying section and is dried by multiple groups of post-drying cylinders. The drying temperature of the drying cylinders is 90℃-115℃. The moisture content of the paper entering the take-up section after passing through the post-drying section is 3.0%-6.0%.

[0066] (4) Super calendering: Use a super calender to calender the 18g / m2 2 The semi-finished product of purple oil-absorbing facial paper with rose fragrance is super calendered, the temperature of the super calender is 60°C, the pressure of the super calender is 65kN / m, and the speed of the super calender is 200m / min. The smoothness of the glossy surface of the oil-absorbing facial paper after super calendering is ≥400s, and the smoothness of the rough surface is ≥120s. Thus, the finished product of the oil-absorbing facial paper of the above product is obtained, and the specific indicators are shown in Table 1.

[0067] Example 5

[0068] This embodiment provides a 20g / m 2 The production process of blue oil-absorbing facial paper with oil-control and moisturizing composite functions comprises the following steps:

[0069] (1) Pulping. The needle pulp and broadleaf pulp fibers were respectively passed through a hydraulic pulper at a rate of 6% to be dispersed until the fibers were completely dispersed, and then circulated through a double-disc refiner for pulping. The beating concentration of the needle pulp fibers was 4.0%, the beating degree of the needle pulp fibers was 85°SR, and the wet weight of the needle pulp fibers was 9.5 g. The beating concentration of the broadleaf pulp fibers was 4.0%, the beating degree of the broadleaf pulp fibers was 55°SR, and the wet weight of the broadleaf pulp fibers was 1.0 g.

[0070] (2) Pulping. The pulping concentration of coniferous pulp and broadleaf pulp is 2.8%, with the coniferous pulp ratio being 42% and the broadleaf pulp ratio being 58%. Then, liquid calcium carbonate (light calcium carbonate) is added to the prepared mixed pulp, and the absolute dry amount of liquid calcium carbonate (light calcium carbonate) added accounts for 25% of the absolute dry weight of the mixed pulp.

[0071] (3) Papermaking is done by a fourdrinier paper machine. The mixed pulp with liquid calcium carbonate (light calcium carbonate) is diluted by pulping and then put on the net. After being dehydrated and formed by the fourdrinier paper machine, it enters the pressing section for pressing and dehydration. The pressing pressure is 0.45Mpa. Then it enters the pre-drying section and is dried by multiple groups of pre-drying cylinders. The drying temperature of the drying cylinders is 90℃-115℃. The moisture content of the paper sheet after the pre-drying section is 3.0%-5.0%. Then it enters the coating section for coating. The coating method is dip coating and the coating amount is 1.3g / m 2The coating aids include 6% oxidized starch; 3.5% dye, all blue dye; 20% tannic acid microcapsules, 20% aloe vera extract microcapsules. The coated paper enters the post-drying section and is dried by multiple groups of post-drying cylinders. The drying temperature of the drying cylinders is 90℃-115℃. The moisture content of the paper entering the take-up section after passing through the post-drying section is 3.0%-6.0%.

[0072] (4) Super calendering: Use a super calender to calender the 20g / m2 2 The semi-finished blue oil-absorbing facial paper with oil control and moisturizing composite functions is super calendered, the temperature of the super calender is 60°C, the pressure of the super calender is 65kN / m, and the speed of the super calender is 200m / min. The smoothness of the glossy surface of the oil-absorbing facial paper after super calendering is ≥400s, and the smoothness of the rough surface is ≥120s. Thus, the finished oil-absorbing facial paper of the above product is obtained, and the specific indicators are shown in Table 1.

[0073] Example 6

[0074] This embodiment provides a 20g / m 2 The production process of yellow oil-absorbing facial paper with rose fragrance comprises the following steps:

[0075] (1) Pulping. The needle pulp and broadleaf pulp fibers were respectively passed through a hydraulic pulper at a rate of 6% to be dispersed until the fibers were completely dispersed, and then circulated through a double-disc refiner for pulping. The beating concentration of the needle pulp fibers was 4.0%, the beating degree of the needle pulp fibers was 83°SR, and the wet weight of the needle pulp fibers was 9.5 g. The beating concentration of the broadleaf pulp fibers was 4.0%, the beating degree of the broadleaf pulp fibers was 55°SR, and the wet weight of the broadleaf pulp fibers was 1 g.

[0076] (2) Pulping. The pulping concentration of coniferous pulp and broadleaf pulp is 2.8%, with coniferous pulp fiber at 45% and broadleaf pulp fiber at 55%. Then, liquid calcium carbonate (light calcium carbonate) is added to the mixed pulp, and the absolute dry weight of the liquid calcium carbonate (light calcium carbonate) accounts for 25% of the absolute dry weight of the mixed pulp.

[0077] (3) Papermaking is done by a fourdrinier paper machine. The mixed pulp with liquid calcium carbonate (light calcium carbonate) is diluted by pulping and then put on the net. After being dehydrated and formed by the fourdrinier paper machine, it enters the pressing section for pressing and dehydration. The pressing pressure is 0.45Mpa. Then it enters the pre-drying section and is dried by multiple groups of pre-drying cylinders. The drying temperature of the drying cylinders is 90℃-115℃. The moisture content of the paper sheet after the pre-drying section is 3.0%-5.0%. Then it enters the coating section for coating. The coating method is dip coating, and the coating amount is 1.1g / m 2; Coating aids include 6% oxidized starch; 0.35% dye, of which yellow dye: red dye: blue dye = 80%: 12%: 8%; 25% rose essence microcapsules. The coated paper enters the post-drying section and is dried by multiple groups of post-drying cylinders. The drying temperature of the drying cylinders is 90℃-115℃. The moisture content of the paper entering the take-up section after passing through the post-drying section is 3.0%-6.0%.

[0078] (4) Super calendering: Use a super calender to calender the 18g / m2 2 The semi-finished product of purple oil-absorbing facial paper with rose fragrance is super calendered, the temperature of the super calender is 60°C, the pressure of the super calender is 65kN / m, and the speed of the super calender is 200m / min. The smoothness of the glossy surface of the oil-absorbing facial paper after super calendering is ≥400s, and the smoothness of the rough surface is ≥120s. Thus, the finished product of the oil-absorbing facial paper of the above product is obtained, and the specific indicators are shown in Table 1.

[0079] Example 7

[0080] The difference between this embodiment and embodiment 1 is that the polysaccharide substance used in the coating preparation is dextrin, and the rest is the same as embodiment 1. The specific indicators of the finished oil-absorbing facial paper are shown in Table 1.

[0081] Example 8

[0082] The difference between this embodiment and embodiment 1 is that the polysaccharide substance used in the coating preparation is maltodextrin, and the rest is the same as embodiment 1. The specific indicators of the finished oil-absorbing facial paper are shown in Table 1.

[0083] Example 9

[0084] The difference between this embodiment and embodiment 1 is that the polysaccharide substance used in the coating preparation is hydroxypropyl starch, and the rest is the same as embodiment 1. The specific indicators of the finished oil-absorbing facial paper are shown in Table 1.

[0085] Example 10

[0086] The difference between this embodiment and embodiment 1 is that the polysaccharide substance used in the coating preparation is sodium carboxymethyl cellulose, and the rest is the same as embodiment 1. The specific indicators of the finished oil-absorbing facial paper are shown in Table 1.

[0087] Embodiment 11

[0088] The difference between this embodiment and embodiment 1 is that the coating amount of the coating preparation is 0.8 g / m 2 , and the rest is the same as in Example 1. The specific indicators of the finished oil-absorbing facial paper are shown in Table 1. The specific indicators of the finished oil-absorbing facial paper are shown in Table 1.

[0089] Example 12

[0090] The difference between this embodiment and embodiment 1 is that the coating amount of the coating preparation is 1.2 g / m 2 , and the rest is the same as in Example 1. The specific indicators of the finished oil-absorbing facial paper are shown in Table 1.

[0091] Embodiment 13

[0092] The difference between this embodiment and embodiment 1 is that the coating amount of the coating preparation is 1.5 g / m 2 , and the rest is the same as in Example 1. The specific indicators of the finished oil-absorbing facial paper are shown in Table 1.

[0093] The test methods for the technical indicators in Table 1 and Table 2 adopt the following standards:

[0094] 1) Quantity (g / m 2 ): According to the national standard test method GB / T 451.2-2023 "Paper and paperboard Part 2: Quantitative determination".

[0095] 2) Thickness (μm): Based on the national standard test method GB / T 451.3-2002 "Determination of thickness of paper and paperboard".

[0096] 3) Ash content (%): According to the national standard test method GB / T 22877-2023 "Determination of ignition residue (ash) of paper, paperboard, pulp and cellulose nanomaterials (525°C)".

[0097] 4) Longitudinal tensile strength (kN / m), longitudinal elongation (%), longitudinal tensile energy absorption (J / m 2 ): Implement the national standard test method GB / T 12914-2024 "Determination of tensile strength of paper and paperboard". These three values ​​are detected simultaneously through one test.

[0098] 5) Glossy surface smoothness (s), rough surface smoothness (s): According to the national standard test method GB / T 456 "Determination of smoothness of paper and paperboard (Buick method)", glossy surface and rough surface simply refer to the side with higher smoothness and the side with lower smoothness of the paper.

[0099] 6) Moisture content (%): In accordance with GB / T 462-2023 "Determination of moisture content of paper, paperboard and pulp analysis samples".

[0100] 7) L value, a value, b value: According to GB / T 7975-2013 "Determination of color of paper and paperboard (diffuse reflectance method)", the L, a, and b values ​​of paper can be directly detected using a colorimeter.

[0101] Table 1 Technical indicators of oil-absorbing facial paper of Examples 1-13

[0102]

[0103]

[0104] Note: The oil-absorbing facial tissue currently on the market is a Japanese product and is available on regular domestic shopping websites.

[0105] In the early stage of the experimental exploration of the present invention, a series of parameters and control conditions were explored, and some of them are listed as follows: Comparative Example 1

[0106] In this comparative example, the wood pulp fiber adopts 100% coniferous pulp fiber, and the rest is the same as in Example 1. The specific indicators of the finished oil-absorbing facial paper are shown in Table 2.

[0107] Comparative Example 2

[0108] In this comparative example, the wood pulp fiber adopts 100% hardwood pulp fiber, and the rest is the same as in Example 1. The specific indicators of the finished oil-absorbing facial paper are shown in Table 2.

[0109] Comparative Example 3

[0110] In this comparative example, the coating amount of the coating preparation is 0.5 g / m 2 , and the rest is the same as in Example 1. The specific indicators of the finished oil-absorbing facial paper are shown in Table 2.

[0111] Comparative Example 4

[0112] In this comparative example, the coating amount of the coating preparation is 2.5 g / m 2 , and the rest is the same as in Example 1. The specific indicators of the finished oil-absorbing facial paper are shown in Table 2.

[0113] Comparative Example 5

[0114] In this comparative example, a rotary paper machine was used for papermaking and forming, and the rest was the same as in Example 1. The specific indicators of the finished oil-absorbing facial paper are shown in Table 2.

[0115] Comparative Example 6

[0116] In this comparative example, the mass ratio of coniferous fiber to broadleaf fiber in the wood pulp fiber is 20%:80%, and the rest is the same as in Example 1. The specific indicators of the finished oil-absorbing facial paper are shown in Table 2.

[0117] Comparative Example 7

[0118] In this comparative example, the mass ratio of coniferous fiber to broadleaf fiber in the wood pulp fiber is 80%:20%, and the rest is the same as in Example 1. The specific indicators of the finished oil-absorbing facial paper are shown in Table 2.

[0119] Table 2 Technical indicators of oil-absorbing facial paper of comparative examples 1 to 7

[0120]

[0121] The data in Table 1 and Table 2 show that it can be seen from Example 1 and Examples 7-10 that the polysaccharide coated on the oil-absorbing facial paper mainly affects the longitudinal tensile strength of the oil-absorbing facial paper. The polysaccharide substances that improve the longitudinal tensile strength of the oil-absorbing facial paper are ranked from strong to weak as follows: coated oxidized starch > dextrin ≈ maltodextrin > hydroxypropyl starch > sodium carboxymethyl cellulose.

[0122] From Examples 1 to 13, when oxidized starch is used in the coating formulation, the coating amount is (0.8-1.5) g / m 2 Within the range, the longitudinal tensile strength of the oil-absorbing facial paper is greater than 1.0 kN / m, which meets the requirements for the machine and use of the oil-absorbing facial paper. After using dextrin and maltodextrin to replace oxidized starch, the longitudinal tensile strength of the oil-absorbing facial paper can also be close to 1.0 kN / m, while after using hydroxypropyl starch and sodium carboxymethyl cellulose, the longitudinal tensile strength is reduced. It can be further seen from Comparative Examples 3-4 that the coating amount of the coating preparation is 0.5 g / m 2 <0.8g / m 2 Due to the low coating amount, the longitudinal tensile strength of the oil-absorbing paper produced is 0.87N / m, which is relatively low. During the paper machine production and rewinding and slitting process, paper breaks frequently and the yield rate is low. 2 >2.0g / m 2 The longitudinal tensile strength of the oil-absorbing facial paper produced is 1.08N / m, and its strength is greater than 1.0kN / m, which is stronger than the coating amount of 2.0g / m 2 The results are basically the same, and the strength improvement is not obvious. Considering the comprehensive analysis of production cost and strength index detection, the ideal coating amount of oxidized starch for oil-absorbing facial paper is (0.8-1.5) g / m 2 .

[0123] Further, from the comparison between Comparative Example 1 and Comparative Example 2, since Comparative Example 1 uses 100% softwood pulp fibers, the fibers are relatively long and closely interwoven, and its longitudinal tensile strength index is significantly improved. However, in the actual paper machine production process, it is found that the dehydration of the paper machine wire section is relatively difficult. In order to ensure the dryness of the finished paper, the steam consumption in the drying section is relatively large, and the oil-absorbing facial paper has poor surface uniformity, which cannot meet the customer's requirements for good appearance uniformity of the oil-absorbing facial paper. Since Comparative Example 2 uses 100% hardwood pulp fibers, the fibers are relatively short, and its longitudinal tensile strength index is significantly low. In the actual paper machine production process, it is found that due to the low strength of the paper sheet, the paper breaks frequently during the paper machine production process, and there are still frequent paper breaks during the rewinding and slitting process, and the problem of low yield rate.

[0124] Comparison of Comparative Example 6 and Comparative Example 7 shows that the coniferous fiber ratio in Comparative Example 6 is 20%, which is lower than the designed value of the coniferous fiber ratio (30%-70%). From the test data, it can be seen that its longitudinal tensile strength is 0.89 kN / m, and its strength is less than 1.0 kN / m, which is relatively low in strength. Frequent paper breaks and low yield rate will occur during paper machine production and rewinding and slitting processes. The coniferous fiber ratio in Comparative Example 7 is 80%, which is lower than the designed value of the coniferous fiber ratio (30%-70%). From the test data, it can be seen that its longitudinal tensile strength is 1.12 kN / m, and its strength is greater than 1.0 kN / m. The strength index meets the requirements, but in the actual paper machine production process, it is found that the dehydration of the paper machine wire is relatively difficult, and the surface uniformity of the oil-absorbing facial paper is poor, which cannot meet the customer's requirements for good appearance uniformity of the oil-absorbing facial paper.

[0125] From the comparison example 5, the comparison example 5 adopts the rotary screen paper machine instead of the fourdrinier paper machine to produce the oil absorbing facial tissue. Due to the low filler retention rate of the rotary screen paper machine system, its ash content detection value is obviously lower than that of the fourdrinier paper machine, which cannot meet the customer's requirement for the high ash content of the oil absorbing facial tissue. At the same time, the oil absorbing facial tissue produced by the rotary screen paper machine has a low ash content, and its touch is also significantly different from that of the oil absorbing facial tissue produced by the fourdrinier paper machine.

[0126] Application Example 1

[0127] In order to further verify the effectiveness of the oil-absorbing facial paper of the present invention, the 18 g / m 2 The oil absorption and oil control performance of brown oil-absorbing facial paper with oil control function is tested and verified as follows:

[0128] Since there is no industry standard or national standard for the oil absorption and oil control performance testing of oil absorbing facial paper, the testing and verification method of this invention is to indirectly verify the 18g / m 2 Whether the oil absorption and oil control performance of brown oil-absorbing facial paper is effective. The test principle is that after the oil-absorbing facial paper absorbs facial oil, the facial oil will fill the pores between the fibers, and the refractive index of light passing through the oil-absorbing facial paper will change, making it easier for light to pass through, and the detected transparency will be higher. Through a large number of experiments (using animal fats and vegetable fats to be quantitatively and evenly applied to a unit area of ​​oil-absorbing facial paper), the test results show that the greater the amount of oil absorbed per unit area of ​​the oil-absorbing facial paper, the higher the transparency value detected. The transparency value detected after the oil-absorbing facial paper absorbs oil is strongly positively correlated with the amount of oil absorbed per unit area of ​​the oil-absorbing facial paper. Therefore, the amount of facial oil absorbed per unit area of ​​the oil-absorbing facial paper can be monitored and determined by detecting the change in the transparency value after the oil-absorbing facial paper absorbs facial oil.

[0129] The experimental plan was formulated as follows:

[0130] Test instrument: YQ-Z-48A whiteness color tester produced by Hangzhou Qingtong Bo Ke Automation Technology Co., Ltd.

[0131] Test conditions: Subjects with oily skin aged between 25 and 45 were selected. The subjects voluntarily participated in the test and signed an informed consent form. During the test, the subjects were prohibited from using any other oil control and skin care products except the brown oil-absorbing facial paper obtained in Example 1. The test environment temperature was 23-25°C and the humidity was 40%-60%. During the test, the test conditions remained consistent.

[0132] Test number and parts: A total of 20 people were tested and randomly divided into 4 groups, each group corresponding to 5 people. Each person used 4 oil-absorbing facial papers to test the forehead, nose, chin and cheeks respectively. The average value of the transparency of the oil-absorbing facial papers was taken, which represents the average level of facial oil secretion of the test persons.

[0133] Test method: After the tester washes the face with clean water at 7:00 in the morning, he sits quietly in a test environment that meets the standard, with the forehead exposed, relaxed, and avoids touching the face. At 9:00 in the morning, the oil-absorbing facial paper of the present invention (with specifications of 90 mm long * 70 mm wide) is used to press the forehead, nose, chin, and cheek parts of the face, 30 times each time (all the above parts are pressed), and the operation is unified. The oil-absorbing facial paper of the present invention is used to press the face for 2 hours each time, and the test is performed 5 times in total. After the oil-absorbing facial paper after each pressing is divided into groups according to the sequence, the transparency of the oil-absorbing facial paper is tested. At the same time, 10 unused blank samples of oil-absorbing facial paper are selected from each group of oil-absorbing facial paper (the oil-absorbing facial paper used in the four groups is cut from the same production paper roll, and the physical indicators can be approximately regarded as the same) as comparison samples, and the transparency is tested. After statistics, the test results are formed as shown in Table 3 below.

[0134] Table 3 Test results

[0135]

[0136]

[0137] It can be seen from the above test results that with the 18g / m 2 As the frequency of use of brown oil-absorbing facial paper with oil-control function increases, the transparency test value of the oil-absorbing facial paper continues to decrease, indicating that the amount of facial oil secretion of the test persons is continuously decreasing, reflecting that the 18g / m 2 The brown oil-absorbing facial paper with oil-control function has significant oil-absorbing and oil-control effects, and the oil-absorbing and oil-control effects are enhanced as the frequency of use of the oil-absorbing facial paper increases.

[0138] Application Example 2

[0139] Further, the 20 g / m 2 The oil control and moisturizing performance of the blue oil-absorbing facial paper with oil control and moisturizing composite functions was tested and verified, using the same subjects and groups as in Application Example 1, and the specific testing and verification methods were the same as in Application Example 1. The test results are shown in Table 4 below.

[0140] Table 4 Test results

[0141]

[0142]

[0143] From the comparison of the test results in Table 3 and Table 4, it can be seen that under the condition that the subjects and grouping conditions are exactly the same, the oil absorption + oil control effect of Example 5 is better than that of Example 1, which is consistent with the fact that the quantitative, ash content, and longitudinal tensile strength of Example 5 in Table 1 are all higher than those of Example 1. It can be seen that the microcapsules added in Example 5 are 20% tannic acid microcapsules and 20% aloe extract microcapsules, and their oil control effect is relatively better, and they also have moisturizing functions, so they also have a certain inhibitory effect on the production of facial oil. The above-mentioned embodiments only express several embodiments of the present invention, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A method for producing a functional oil-absorbing facial paper, characterized in that: The steps include: Step 1, mixing the pulped wood pulp fibers and light calcium carbonate for papermaking and forming, and then sequentially subjecting the mixture to pressing, dehydration and primary drying; the wood pulp fibers are composed of coniferous pulp fibers and broadleaf pulp fibers; Step 2, coating the paper sheet after the primary drying process with a coating preparation containing microcapsules; the coating preparation containing microcapsules is formed by coating microcapsules with a polysaccharide solution; the polysaccharide is selected from at least one of oxidized starch, dextrin, maltodextrin, hydroxypropyl starch, and sodium carboxymethyl cellulose; Step 3, subjecting the coated paper sheet to secondary drying, winding and super calendering treatment in sequence to obtain the oil-absorbing facial tissue.

2. The production method according to claim 1, characterized in that In step 1, the wood pulp fiber composition by weight percentage is: 30-70% coniferous pulp fiber and 30-70% hardwood pulp fiber, wherein the mass concentration of the coniferous pulp fiber and the hardwood pulp fiber is 2.5-4.5%.

3. The production method according to claim 2, characterized in that: The beating conditions of the coniferous pulp fibers are: a beating concentration of 3.0%-5.0%, and a beating degree of 80°SR-90°SR; and / or, the beating conditions of the broadleaf pulp fibers are: a beating concentration of 3.0%-5.0%, and a beating degree of 55°SR-65°SR.

4. The production method according to claim 1, characterized in that In the step 1, the light calcium carbonate is light solid calcium carbonate or light liquid calcium carbonate, and the absolute dry added amount of the light calcium carbonate accounts for 20-40% of the absolute dry weight of the mixed pulp; and / or, the papermaking and forming process adopts a fourdrinier paper machine, preferably, the web concentration is 0.1-1.0%; and / or, the control parameters of the primary drying process are: temperature 90-110°C, drying to a paper sheet moisture content of 3.0-5.0%.

5. The production method according to claim 1, characterized in that: In step 2, the coating preparation containing microcapsules comprises, by mass percentage, 4-8% polysaccharide, 10-40% microcapsules, 0-10% dye, and the balance is water; and / or, the coating treatment method is dip coating, preferably, the coating amount is 0.8-1.5 g / m 2 .

6. The production method according to claim 1 or 5, characterized in that: The microcapsule is formed by encapsulating a functional component that can be used for facial care through a wall material, and the functional component is a plant extract.

7. The production method according to claim 5 or 6, characterized in that: The method for preparing the coating preparation containing microcapsules comprises the following steps: Step 1), preparing a polysaccharide solution with water, and gelatinizing at 90-95°C for 30-60 minutes; Step 2), lowering the temperature of the gelatinized oxidized starch solution to 40-50° C., adding microcapsules and dyes, and obtaining the coating preparation.

8. The production method according to claim 1, characterized in that: In step 3, the control parameters of the secondary drying treatment are: temperature 90-115°C, drying to a semi-dry paper sheet with a moisture content of 3.0-6.0%; and / or, the control parameters of the super calendering treatment are: temperature 55°C-75°C, pressure 60kN / m-80kN / m, and vehicle speed 180m / min-220m / min.

9. The functional oil-absorbing facial paper obtained by the production method according to any one of claims 1 to 8.

10. The functional oil-absorbing facial paper according to claim 9, characterized in that: The functional oil-absorbing facial paper has a thickness of ≥30 μm, a longitudinal tensile strength of ≥0.80 kN / m, a smoothness of the smooth surface of ≥450 s, a smoothness of the rough surface of ≥130 s, and an ash content of ≥13%.

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