Medical glove liner paper and method of making

Abstract

The application relates to the papermaking technical field, in particular to a medical glove inner liner paper and a preparation method thereof. The medical glove inner liner paper comprises a base paper layer, mixed pulp with a beating degree of 25-35 degrees SR, a wet strength agent with an absolute dry fiber amount of 0.1-1% of the mixed pulp and a water resistance agent with an absolute dry fiber amount of 0.1-1% of the mixed pulp; and a surface sizing layer, wherein the adhesive is respectively applied to two surfaces of the base paper layer, and the total amount of the surface sizing on the two surfaces is 1-5 g / m 2 The medical glove inner liner paper provided by the application can obtain a medical glove inner liner paper with good air permeability by adopting the mixed pulp with specific components and controlling the beating degree, so as to guarantee the sterilization effect before use of the glove and the comfort during use.

Description

Technical Field

[0001] This application relates to the field of papermaking technology, specifically to a medical glove liner paper and its preparation method. Background Technology

[0002] Medical glove lining paper is a widely used fiber-based medical material used inside medical glove packaging to provide support and ensure ease of handling. This paper must have high air permeability to ensure sterilization before use, involving passing multiple layers of paper through ethylene oxide or steam. It must also have good stiffness to ensure the gloves are placed stably; its special manufacturing process and high bulk address the issue of paper bounce when handling medical gloves. High surface strength is required to prevent lint and dust shedding, ensuring the safety and hygiene of the medical gloves.

[0003] However, the existing ordinary glove liner paper cannot meet the requirements of medical glove liner paper. Therefore, special raw and auxiliary materials and manufacturing processes are needed to overcome the problems of ordinary glove liner paper and develop medical glove liner paper that meets the requirements of medical hygiene and packaging.

[0004] In summary, there is an urgent need in this field for a medical glove lining paper to solve the aforementioned technical problems.

[0005] In view of the above, this application is hereby submitted. Summary of the Invention

[0006] The purpose of this application is to provide a medical glove liner paper and a method for preparing the same, in order to solve at least one of the technical problems mentioned in the background art.

[0007] Specifically, in the first aspect of this application, a medical glove liner paper is provided, comprising:

[0008] The base paper layer comprises a mixed pulp with a freeness of 25-35°SR, and 0.1-1% of a wet strength agent and 0.1-1% of a water-resistant agent in the oven-dry fiber weight of the mixed pulp.

[0009] The adhesive layer is applied to both sides of the base paper layer, with a total adhesive content of 1-5 g / m² on both sides. 2 .

[0010] By adopting the above technical solution, and by using a mixed pulp with specific components and controlling the beating degree, it is possible to obtain medical glove lining paper with good air permeability, so as to ensure the sterilization effect before use and the comfort during use.

[0011] Preferably, the mixed pulp comprises 40-50% softwood pulp and 50-60% non-softwood pulp, wherein the non-softwood pulp is selected from at least one of hardwood pulp and bamboo pulp.

[0012] Preferably, the wet strength agent is 0.1-0.6% of the oven-dry fiber weight of the mixed slurry.

[0013] Preferably, the water-resistant agent is 0.2-0.5% of the oven-dry fiber weight of the mixed pulp.

[0014] Preferably, the wet strength agent is polyamide epichlorohydrin resin (PAE), and the water-resistant agent is alkyl ketene dimer (AKD).

[0015] Preferably, the adhesive comprises 2-6% polymer, 2-5% antistatic agent, and the balance being water; wherein the polymer is selected from at least one of oxidized starch, cellulose derivatives, polyvinyl alcohol, and acrylic latex; and the antistatic agent is a metal ion salt compound.

[0016] Preferably, the viscosity of the adhesive is less than 100 centipoise.

[0017] Preferably, the glass transition temperature (Tg) of the acrylic latex is greater than or equal to 20°C.

[0018] Preferably, the antistatic agent is selected from at least one of sodium chloride and calcium chloride.

[0019] Preferably, the basis weight of the medical glove lining paper is 28-32 g / m². 2 .

[0020] Preferably, the longitudinal tensile strength of the medical glove lining paper is ≥15N, the longitudinal bending stiffness (bending moment 10mm 15°) is ≥8.0mN, the air permeability is 1500±200Cu, the paper conductivity is ≥50μs / cm, and the moisture content is 7-9%.

[0021] Preferably, the smoothness of the front side of the paper is 300-400s, and the smoothness of the back side is 20-50s.

[0022] A second aspect of this application provides a method for preparing the inner lining paper of medical gloves as described in the first aspect of this application, the method comprising the steps of:

[0023] Preparation of the base paper layer: Take softwood pulp and non-softwood pulp with a beating degree of 25-35°SR, add 0.1-1% of wet strength agent and 0.1-1% of water-resistant agent relative to the oven-dry fiber weight of the mixed pulp, and dry to obtain the base paper;

[0024] Surface sizing: The base paper then enters a two-roll sizing mill for surface sizing treatment. An adhesive emulsion consisting of 2-6% polymer, 2-5% antistatic agent, and the remainder water is prepared and applied to both sides of the base paper. The sizing amount is 1-5 g / m². 2 .

[0025] Preferably, in the step of preparing the base paper layer, the base paper is made using a cylinder or wire paper machine, and the drying cylinder is a Yankee drying cylinder with a diameter greater than 1.5 meters.

[0026] Preferably, the polymer is oxidized starch, and the antistatic agent is sodium chloride; the dissolving step of the adhesive emulsion includes: adding oxidized starch to cold water, then gradually heating to 80-100°C until the liquid becomes transparent, then keeping it at 50-70°C for 10-40 minutes, and then adding sodium chloride to dissolve it; wherein, the temperature of the cold water is 0-25°C.

[0027] Preferably, the polymer is sodium carboxymethyl cellulose and the antistatic agent is calcium chloride; the dissolution step of the adhesive emulsion includes: slowly adding sodium carboxymethyl cellulose powder to cold water while stirring, then gradually heating to 40-50°C until the powder is completely dissolved, with a solubility of 3-5%, followed by adding calcium chloride to dissolve it; wherein, the temperature of the cold water is 0-25°C.

[0028] Preferably, the polymer is polyvinyl alcohol, and the antistatic agent is sodium chloride; the dissolution step of the adhesive emulsion includes: adding polyvinyl alcohol to cold water, then gradually heating to 95°C until the polyvinyl alcohol is completely dissolved, with a solubility of 8-10%, and then adding sodium chloride to dissolve it; wherein the temperature of the cold water is 0-25°C.

[0029] Preferably, the polymer is acrylic latex (Tg = 30℃), and the antistatic agent is calcium chloride; the dissolution step of the adhesive emulsion includes: adding acrylic latex stock solution to cold water for dilution to a concentration of 2-6%, and then adding calcium chloride to dissolve it; wherein, the temperature of the cold water is 0-25℃.

[0030] Preferably, the method for preparing the medical glove liner paper further includes the step of:

[0031] Calendering: After the paper is sized and dried, it enters the calender, which includes hard rollers and soft rollers spaced apart. The front side of the paper contacts the hard rollers and the back side contacts the soft rollers. The calendering pressure is 0.5-5 kgf / cm.

[0032] Preferably, the method for preparing the medical glove liner paper further includes the step of:

[0033] Dust removal and purification treatment: After calendering, the paper is slit, wound and dust removed and purified outside the machine. The dust removal and purification is carried out by blowing air on one side of the paper and suctioning dust under negative pressure on the other side.

[0034] Preferably, the basis weight of the medical glove lining paper is 28-32 g / m².2 Longitudinal tensile strength ≥15N, air permeability 1500±200Cu, longitudinal bending stiffness (bending moment 10mm 15°) ≥8.0mN, paper conductivity ≥50μs / cm, moisture content 7-9%.

[0035] Preferably, the smoothness of the front side of the paper is 300-400s, and the smoothness of the back side is 20-50s.

[0036] In summary, this application has the following beneficial effects:

[0037] 1. The medical glove liner paper provided in this application, by using a mixed pulp of specific components and controlling the beating degree, can obtain a medical glove liner paper with good air permeability, so as to ensure the sterilization effect before use and the comfort during use.

[0038] 2. The medical glove liner paper provided in this application achieves a significant improvement in stiffness at low basis weight by preparing a specific adhesive and mixing it with a corresponding proportion of mixed pulp, so as to ensure that the gloves are placed stably and solve the technical problem of paper bounce when medical gloves are taken out.

[0039] 3. The medical glove lining paper provided in this application improves the antistatic properties of the paper by adding a small amount of antistatic additive and controlling the high moisture content of the paper after it leaves the machine. This reduces the adsorption of dust and paper fibers during slitting, thereby improving the hygiene and cleanliness of the medical glove lining paper.

[0040] 4. The method for preparing medical glove liner paper provided in this application is simple and efficient, and can efficiently prepare medical glove liner paper that meets quality requirements, and has good prospects for industrial application. Detailed Implementation

[0041] The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0042] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0043] The present application will be described in detail below through examples.

[0044] Medical glove lining paper is a widely used fiber-based medical material used inside medical glove packaging to provide support and ensure ease of handling. This paper must have high air permeability to ensure sterilization before use, involving passing multiple layers of paper through ethylene oxide or steam. It must also have good stiffness to ensure the gloves are placed stably; its special manufacturing process and high bulk address the issue of paper bounce when handling medical gloves. High surface strength is required to prevent lint and dust shedding, ensuring the safety and hygiene of the medical gloves.

[0045] Currently, the air permeability of ordinary glove lining paper is generally low, typically only 10-20Cu. Moreover, ordinary glove lining paper has low conductivity, poor antistatic ability, and serious static dust attraction, making it difficult to meet the requirements of medical glove lining paper. Therefore, it is necessary to use special raw and auxiliary materials and manufacturing processes to overcome the problems of ordinary glove lining paper and develop medical glove lining paper that meets the needs of medical hygiene and packaging.

[0046] In view of this, in order to solve the existing technical problems in the background art, the inventive concept of this application is to provide a medical glove lining paper, the base paper layer comprising a mixed pulp with a freeness of 25-35°SR, and a wet strength agent and a water-resistant agent at 0.1-1% of the oven-dry fiber weight of the mixed pulp; the surface sizing layer comprising an adhesive applied to both sides of the base paper layer, with a total surface sizing amount of 1-5 g / m² on both sides. 2 .

[0047] According to this inventive concept, this application can obtain a medical glove liner paper with good air permeability by using a mixed pulp of specific components and controlling the beating degree, so as to ensure the sterilization effect before use and the comfort during use.

[0048] To better understand the above technical solutions, the following detailed descriptions will be provided in conjunction with specific implementation methods. Those skilled in the art should also understand that the reaction time and component feeding involved in this application cannot be absolutely precise in actual production, but are all within the allowable error range. For example, if the desired heating time is 30 minutes, the actual operation may be 30 minutes plus or minus 1 second; if the desired sample weight is 30g, the actual weight may be 30.001g or 29.998g.

[0049] Unless otherwise specified, all raw materials mentioned in this application are commercially available products.

[0050] Example 1

[0051] Preparation of the base paper layer: Take 40% softwood pulp and 60% hardwood pulp, with a beating degree of 30°SR, and prepare a mixed pulp. Add 0.3% PAE and 0.4% AKD relative to the oven-dry fiber weight to the pulp. Dry the base paper in a Yankee oven.

[0052] Surface sizing: The base paper, after being dried in the Yankee oven, immediately enters a two-roll sizing mill for surface sizing. The surface sizing agent consists of a mixed adhesive emulsion of 3% oxidized starch and 3% sodium chloride. Surface sizing is applied to both sides of the base paper, with a sizing amount of 2 g / m². 2 ;

[0053] The method for dissolving oxidized starch includes the following steps: adding oxidized starch to cold water, gradually heating it to 95°C until the liquid becomes transparent, then keeping it at 60°C for 30 minutes to achieve a solubility of 3%; subsequently adding sodium chloride to achieve a sodium chloride concentration of 3%.

[0054] Calendering: After the paper with surface sizing is dried, it enters the calender. The calender includes steel rollers and soft rollers arranged at intervals. The front side of the paper is in contact with the steel rollers, and the back side is in contact with the soft rollers. The calendering pressure is 2.5 kgf / cm.

[0055] Dust removal and purification treatment: After calendering, the paper is slit, wound and dust removed and purified outside the machine. The dust removal and purification is carried out by blowing air on one side of the paper and suctioning dust under negative pressure on the other side.

[0056] Example 2

[0057] Preparation of the base paper layer: Take 50% softwood pulp and 50% hardwood pulp, with a beating degree of 25°SR, and prepare a mixed pulp. Add 0.5% PAE and 0.3% AKD relative to the oven-dry fiber weight to the pulp. Dry the base paper in a Yankee oven.

[0058] Surface sizing: The base paper, after being dried in the Yankee oven, immediately enters a two-roll sizing mill for surface sizing. The surface sizing agent consists of a mixed adhesive emulsion of 5% sodium carboxymethyl cellulose and 3% calcium chloride; both sides of the base paper are sizing treated, with a sizing amount of 4 g / m². 2 ;

[0059] The method for dissolving sodium carboxymethyl cellulose includes the following steps: slowly adding sodium carboxymethyl cellulose powder to cold water while stirring, then gradually heating to 45°C until the powder is completely dissolved, with a solubility of 5%; subsequently adding calcium chloride to bring the calcium chloride concentration to 3%.

[0060] Calendering: After the paper with surface sizing is dried, it enters the calender. The calender includes steel rollers and soft rollers arranged at intervals. The front side of the paper is in contact with the steel rollers, and the back side is in contact with the soft rollers. The calendering pressure is 3.0 kgf / cm.

[0061] Dust removal and purification treatment: After calendering, the paper is slit, wound and dust removed and purified outside the machine. The dust removal and purification is carried out by blowing air on one side of the paper and suctioning dust under negative pressure on the other side.

[0062] Example 3

[0063] Preparation of the base paper layer: Take 50% softwood pulp and 50% bamboo pulp, with a beating degree of 30°SR, and prepare a mixed pulp. Add 0.4% PAE and 0.3% AKD relative to the oven-dry fiber weight to the pulp. Dry the base paper in a Yankee oven.

[0064] Surface sizing: The base paper, after being dried in the Yankee oven, immediately enters a two-roll sizing mill for surface sizing. The surface sizing agent is a mixed adhesive emulsion consisting of 3% polyvinyl alcohol and 3% sodium chloride; both sides of the base paper are sizing treated, with a sizing amount of 3 g / m². 2 ;

[0065] The method for dissolving polyvinyl alcohol includes the following steps: adding polyvinyl alcohol to cold water, then gradually heating to 95°C until the polyvinyl alcohol is completely dissolved, with a solubility of 8%; after the polyvinyl alcohol is dissolved, diluting it with warm water to a concentration of 3%; and then adding sodium chloride to make the sodium chloride concentration reach 3%.

[0066] Calendering: After the paper with surface sizing is dried, it enters the calender. The calender includes steel rollers and soft rollers arranged at intervals. The front side of the paper is in contact with the steel rollers, and the back side is in contact with the soft rollers. The calendering pressure is 4.0 kgf / cm.

[0067] Dust removal and purification treatment: After calendering, the paper is slit, wound and dust removed and purified outside the machine. The dust removal and purification is carried out by blowing air on one side of the paper and suctioning dust under negative pressure on the other side.

[0068] Example 4

[0069] Preparation of the base paper layer: Take 40% softwood pulp and 60% bamboo pulp, with a beating degree of 35°SR, and prepare a mixed pulp. Add 0.3% PAE and 0.4% AKD relative to the oven-dry fiber weight to the pulp. Dry the base paper in a Yankee oven.

[0070] Surface sizing: The base paper, after being dried in the Yankee oven, immediately enters a two-roll sizing mill for surface sizing. The surface sizing agent consists of a mixed adhesive emulsion of 6% acrylic latex (Tg = 30℃) and 5% calcium chloride; both sides of the base paper are sizing treated, with a sizing amount of 5 g / m². 2 ;

[0071] The method for diluting acrylic latex includes the following steps: adding acrylic latex stock solution to cold water to dilute it to a concentration of 6%; then adding calcium chloride to bring the sodium chloride concentration to 5%.

[0072] Calendering: After the paper with surface sizing is dried, it enters the calender. The calender includes steel rollers and soft rollers arranged at intervals. The front side of the paper is in contact with the steel rollers, and the back side is in contact with the soft rollers. The calendering pressure is 5.0 kgf / cm.

[0073] Dust removal and purification treatment: After calendering, the paper is slit, wound and dust removed and purified outside the machine. The dust removal and purification is carried out by blowing air on one side of the paper and suctioning dust under negative pressure on the other side.

[0074] Comparative Example 1

[0075] The paper used is the lining paper for commercially available ordinary gloves, produced by Beijing Ruijing Latex Products Co., Ltd.

[0076] Detection Example 1

[0077] According to the testing methods in the relevant testing standards, the following indicators were tested in Examples 1-4 and Comparative Example 1: paper basis weight (GB / T 451.2-2002), density (GB / T 451.3-2002), air permeability (GB / T 23227-2018), longitudinal tensile strength (GB / T 12914-2018), longitudinal bending stiffness (GB / T 22364-2018), transverse bending stiffness (GB / T 22364-2018), front smoothness (GB / T 456-2002), back smoothness (GB / T 456-2002), printing surface strength (GB / T22365), paper conductivity (GB / T 7977-2007), and moisture content after printing (GB / T 462). The above indicators are all key indicators for glove lining paper. Glove lining paper that meets the requirements of the above indicators can be considered as a qualified product as desired in this application.

[0078] The test results are shown in Table 1.

[0079] Table 1. Paper parameters of Examples 1-4 and Comparative Example 1

[0080]

[0081]

[0082] Based on the experimental results in Table 1, those skilled in the art can understand that:

[0083] First, the medical glove liner paper obtained in Examples 1-4 of this application, after surface sizing and calendering, all meet the target value requirements in terms of performance indicators, which can solve the problems in the prior art and obtain high-quality medical glove liner paper.

[0084] Second, after applying a mixed latex composed of a high-polymer with strong adhesion and increased stiffness and an antistatic agent to the surface, the tensile strength, bending stiffness and printing surface strength of the paper are significantly improved compared to the target values, without affecting other paper parameters.

[0085] Third, the medical glove liner paper obtained in Examples 1-4 of this application has significantly improved air permeability and paper conductivity compared with commercially available ordinary glove liner paper, which makes the paper more breathable and antistatic, and more suitable for the use scenario of medical glove liner.

[0086] In addition, the air permeability of ordinary glove lining paper is generally low, usually only 10-20Cu, while the air permeability of the medical glove lining paper of this invention reaches 1500±200Cu. Moreover, ordinary glove lining paper has low conductivity, poor antistatic ability, and serious static dust attraction.

[0087] This invention patent improves the antistatic properties of paper by adding a small amount of antistatic additives and controlling a relatively high moisture content after the paper exits the machine. This reduces the paper's adsorption of dust and paper fibers during slitting, thus improving the hygiene and cleanliness of the medical glove lining paper. The antistatic additives, sodium chloride or calcium chloride, have a certain moisture-absorbing and moisturizing capacity. Adding a small amount of these substances can prevent moisture loss from the paper even in relatively dry conditions, reducing the increase in static electricity caused by water loss and preventing the paper from adsorbing paper fibers and dust during slitting. While the moisture content of ordinary paper exiting the machine is generally around 6%, the moisture content of the medical glove lining paper described in this invention patent is controlled at around 8%. This higher moisture content, without affecting paper quality, enhances the paper's antistatic properties and reduces the adsorption of dust and paper fibers.

[0088] Furthermore, the basis weight of the medical glove lining paper described in this invention is approximately 10 g / m² lower than that of ordinary glove lining paper. 2 Generally, a lower basis weight in paper results in lower stiffness, and higher moisture content further worsens stiffness. This invention addresses this issue by adding specific polymers to the surface sizing agent to enhance adhesion and stiffness. This effectively compensates for the reduced stiffness caused by lower basis weight and higher moisture content, while also increasing surface strength and reducing lint and dusting.

[0089] Furthermore, in this invention, the front side of the medical glove lining paper is the printing surface, with a smoothness of 300-400s, while the smoothness of the back side is only 20-50s. Paper dried using common multi-cylinder drying methods does not have single-sided gloss, and subsequent calendering cannot guarantee single-sided gloss either. Therefore, special equipment is required for papermaking. The base paper of this invention is made using a long-wire paper machine or a rotary paper machine equipped with a Yankee drying cylinder and a surface sizing machine. The diameter of the Yankee drying cylinder must be greater than 1.5 meters to ensure rapid drying and single-sided gloss. However, the smoothness of the front side of the paper dried in the Yankee drying cylinder is generally only 60s, and the smoothness of the back side (not in contact with the cylinder) is only 3-4s. Therefore, the paper also needs calendering. However, if multi-roll calendering is used, the smoothness of both sides of the paper will exceed 100s, which cannot meet the requirements of single-sided calendering. Therefore, only one steel roller and one soft roller are used for calendering once to achieve the requirements of 300-400s on the front side and 20-50s on the back side.

[0090] Comparative Example 2

[0091] Preparation of the base paper layer: Take 40% softwood pulp and 60% hardwood pulp, with a beating degree of 38°SR, and prepare a mixed pulp. Add 0.3% PAE and 0.4% AKD relative to the oven-dry fiber weight to the pulp. Dry the base paper in a Yankee oven.

[0092] Surface sizing: The base paper, after being dried in the Yankee oven, immediately enters a two-roll sizing machine for surface sizing. The surface sizing agent consists of a mixed adhesive emulsion of 3% oxidized starch and 3% sodium chloride; both sides of the base paper are sizing treated, with a sizing amount of 2-3 g / m². 2 ;

[0093] The method for dissolving oxidized starch includes the following steps: adding oxidized starch to cold water, gradually heating it to 95°C until the liquid becomes transparent, then keeping it at 60°C for 30 minutes, achieving a solubility of 3-5%; subsequently adding sodium chloride to bring the sodium chloride concentration to 3%.

[0094] Calendering: After the paper with surface sizing is dried, it enters the calender. The calender includes steel rollers and soft rollers arranged at intervals. The front side of the paper is in contact with the steel rollers, and the back side is in contact with the soft rollers. The calendering pressure is 2.5 kgf / cm.

[0095] In Comparative Example 2, the freeness of the mixed pulp was 38°SR. After surface sizing and calendering, the air permeability of the paper was only 1006Cu, which did not meet the requirement of 1500±200Cu. Therefore, no further dust removal and purification treatment was carried out.

[0096] Comparative Example 3

[0097] Preparation of the base paper layer: Take 40% softwood pulp and 60% bamboo pulp, with a beating degree of 40°SR, and prepare a mixed pulp. Add 0.3% PAE and 0.4% AKD relative to the oven-dry fiber weight to the pulp. Dry the base paper in a Yankee oven.

[0098] Surface sizing: The base paper, after being dried in the Yankee oven, immediately enters a two-roll sizing machine for surface sizing. The surface sizing agent consists of a mixed adhesive emulsion of 3% oxidized starch and 3% sodium chloride; both sides of the base paper are sizing treated, with a sizing amount of 2-3 g / m². 2 ;

[0099] The method for dissolving oxidized starch includes the following steps: adding oxidized starch to cold water, gradually heating it to 95°C until the liquid becomes transparent, then keeping it at 60°C for 30 minutes, achieving a solubility of 3-5%; subsequently adding sodium chloride to bring the sodium chloride concentration to 3%.

[0100] Calendering: After the paper with surface sizing is dried, it enters the calender. The calender includes steel rollers and soft rollers arranged at intervals. The front side of the paper is in contact with the steel rollers, and the back side is in contact with the soft rollers. The calendering pressure is 2.5 kgf / cm.

[0101] In Comparative Example 3, the freeness of the mixed pulp was 40°SR. After surface sizing and calendering, the air permeability of the paper was only 945Cu, which did not meet the requirement of 1500±200Cu. Therefore, no further dust removal and purification treatment was carried out.

[0102] Comparative Example 4

[0103] This comparative example is basically the same as Example 2, except that the surface coating steps are different:

[0104] Replace 5% sodium carboxymethyl cellulose with 5% hydroxypropyl methyl cellulose.

[0105] Testing revealed that the longitudinal bending stiffness (bending moment 10mm 15°) of Comparative Example 4 was 7.0mN and the transverse bending stiffness (bending moment 10mm 15°) was 3.0mN, which failed to meet the target requirements of the product parameters.

[0106] Comparative Example 5

[0107] This comparative example is basically the same as Example 3, except that the surface coating step is different:

[0108] Replace 5% sodium carboxymethyl cellulose with 5% polyethylene glycol 4000.

[0109] Testing revealed that the longitudinal bending stiffness (bending moment 10mm 15°) of Comparative Example 5 was 6.8mN and the transverse bending stiffness (bending moment 10mm 15°) was 2.9mN, which failed to meet the target requirements of the product parameters.

[0110] Comparative Example 6

[0111] This comparative example is basically the same as Example 4, except that the surface coating step is different:

[0112] Replace 6% acrylic latex (Tg = 30℃) with 6% acrylic latex (Tg = 10℃).

[0113] Testing revealed that Comparative Example 6 had a longitudinal bending stiffness (bending moment 10mm 15°) of 7.2mN, a transverse bending stiffness (bending moment 10mm 15°) of 3.0mN, and an air permeability of 995Cu, failing to meet the target requirements of the product parameters.

[0114] Comparative Example 7

[0115] This comparative example is basically the same as Example 1, except that:

[0116] The base paper layer is prepared from 80% softwood pulp and 20% hardwood pulp.

[0117] Testing revealed that the air permeability of Comparative Example 7 was 945Cu, which failed to meet the target requirements of the product parameters.

[0118] Comparative Example 8

[0119] This comparative example is basically the same as Example 2, except that:

[0120] The base paper layer is prepared from 80% softwood pulp and 20% hardwood pulp.

[0121] Testing revealed that the air permeability of Comparative Example 8 was 1068Cu, which failed to meet the target requirements of the product parameters.

[0122] Comparative Example 9

[0123] This comparative example is basically the same as Example 3, except that:

[0124] The base paper layer is prepared from 80% softwood pulp and 20% bamboo pulp.

[0125] Testing revealed that the air permeability of Comparative Example 9 was 928Cu, which failed to meet the target requirements of the product parameters.

[0126] Comparative Example 10

[0127] This comparative example is basically the same as Example 4, except that:

[0128] The base paper layer is prepared from 80% softwood pulp and 20% bamboo pulp.

[0129] Testing revealed that the air permeability of Comparative Example 10 was 806Cu, which failed to meet the target requirements of the product parameters.

[0130] Those skilled in the art understand that paper stiffness is closely related to its basis weight; generally, the higher the basis weight, the higher the paper stiffness. The basis weight of ordinary glove lining paper is typically around 40 g / m³. 2 The medical glove lining paper of this invention has a low basis weight, only 30g / m². 2 Approximately. According to the comparative examples 2-10 above, this application, by preparing a specific adhesive and combining it with a corresponding proportion of mixed pulp, significantly improves the stiffness of paper at low basis weight, achieving efficient utilization of raw materials.

[0131] In summary, the medical glove liner paper and its preparation method provided in this application produce medical glove liner paper with good air permeability, excellent tensile strength and bending stiffness, effectively solving the technical problems of medical glove liner paper in the prior art, and has good application prospects.

[0132] It should be noted that, for those skilled in the art, the technical features in the above embodiments can be freely combined, and the resulting technical solutions also belong to the embodiments disclosed in this application.

[0133] Furthermore, without departing from the principles of this application, several improvements and modifications may be made to this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A medical glove lining paper, characterized in that, include: The base paper layer comprises a mixed pulp with a freeness of 25-35°SR, and 0.1-1% of a wet strength agent and 0.1-1% of a water-resistant agent in the oven-dry fiber weight of the mixed pulp. For the surface adhesive layer, the adhesive is applied to both sides of the base paper layer, with a total adhesive amount of 1-5 g / m². 2 .

2. The medical glove lining paper according to claim 1, characterized in that: The mixed pulp comprises 40-50% softwood pulp and 50-60% non-softwood pulp, wherein the non-softwood pulp is selected from at least one of broadwood pulp and bamboo pulp.

3. The medical glove liner paper according to claim 1, characterized in that: The wet strength agent is 0.1-0.6% of the oven-dry fiber weight of the mixed slurry, and / or the water-resistant agent is 0.2-0.5% of the oven-dry fiber weight of the mixed slurry.

4. The medical glove liner paper according to claim 3, characterized in that: The wet strength agent is polyamide epichlorohydrin resin, and the water-resistant agent is alkyl ketene dimer.

5. The medical glove liner paper according to claim 1, characterized in that: The adhesive comprises 2-6% polymer, 2-5% antistatic agent, and the balance water; wherein the polymer is selected from at least one of oxidized starch, cellulose derivatives, polyvinyl alcohol, and acrylic latex; and the antistatic agent is a metal ion salt compound selected from at least one of sodium chloride and calcium chloride.

6. The medical glove liner paper according to claim 1, characterized in that: The basis weight of the medical glove lining paper is 28-32 g / m². 2 .

7. The medical glove liner paper according to claim 1, characterized in that: The longitudinal tensile strength of the medical glove lining paper is ≥15N, the longitudinal bending stiffness is ≥8.0mN, the air permeability is 1500±200Cu, the paper conductivity is ≥50μs / cm, and the moisture content is 7-9%.

8. A method for preparing the inner lining paper of a medical glove as described in any one of claims 1-7, characterized in that: The method includes the following steps: Preparation of the base paper layer: Take softwood pulp and non-softwood pulp with a beating degree of 25-35°SR, add 0.1-1% of wet strength agent and 0.1-1% of water-resistant agent relative to the oven-dry fiber weight of the mixed pulp, and dry to obtain the base paper; Surface sizing: The base paper then enters a two-roll sizing mill for surface sizing treatment. An adhesive emulsion consisting of 2-6% polymer, 2-5% antistatic agent, and the remainder water is prepared and applied to both sides of the base paper. The sizing amount is 1-5 g / m². 2 .

9. The method for preparing the medical glove liner paper according to claim 8, characterized in that: The polymer is oxidized starch, and the antistatic agent is sodium chloride. The dissolution step of the adhesive emulsion includes: adding oxidized starch to cold water, gradually heating to 80-100℃ until the liquid becomes transparent, keeping it at 50-70℃ for 10-40 minutes, and then adding sodium chloride to dissolve it; wherein the temperature of the cold water is 0-25℃. And / or, The polymer is sodium carboxymethyl cellulose, and the antistatic agent is calcium chloride. The dissolution step of the adhesive emulsion includes: slowly adding sodium carboxymethyl cellulose powder to cold water while stirring, then gradually heating to 40-50°C until the powder is completely dissolved, with a solubility of 3-5%, followed by adding calcium chloride to dissolve it; wherein the temperature of the cold water is 0-25°C. And / or, The polymer is polyvinyl alcohol, and the antistatic agent is sodium chloride; the dissolution step of the adhesive emulsion includes: adding polyvinyl alcohol to cold water, then gradually heating to 95°C until the polyvinyl alcohol is completely dissolved, with a solubility of 8-10%, followed by adding sodium chloride to dissolve it; wherein, the temperature of the cold water is 0-25°C; And / or, The polymer is acrylic latex, and the antistatic agent is calcium chloride. The dissolution step of the adhesive emulsion includes: adding acrylic latex stock solution to cold water for dilution to a concentration of 2-6%, and then adding calcium chloride to dissolve it; wherein the temperature of the cold water is 0-25℃.

10. The method for preparing the medical glove liner paper according to claim 8, characterized in that: The method for preparing the inner lining paper of the medical gloves further includes the following steps: Calendering: After the paper with surface sizing is dried, it enters the calender. The calender includes hard rollers and soft rollers arranged at intervals. The front side of the paper contacts the hard rollers and the back side contacts the soft rollers. The calendering pressure is 0.5-5 kgf / cm. Dust removal and purification treatment: After calendering, the paper is slit, wound and dust removed and purified outside the machine. The dust removal and purification is carried out by blowing air on one side of the paper and suctioning dust under negative pressure on the other side.

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