CN111705544A

CN111705544A - Sterile blue medical crepe paper and preparation method thereof

Info

Publication number: CN111705544A
Application number: CN202010560872.9A
Authority: CN
Inventors: 汤新根; 邓根青
Original assignee: Welbon Special Material Co ltd
Current assignee: Welbon Special Material Co ltd
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2020-09-25

Abstract

The invention discloses sterile blue medical crepe paper and a preparation method thereof, wherein the pulp ratio of the crepe paper is as follows: the pulp comprises 75-95% of main pulp and 5-25% of auxiliary pulp. The preparation method comprises pulping, preparing pulp, making a front pool, flushing pulp and the like, and finally molding, squeezing, drying, press polishing, coiling, finally inspecting, slitting, packaging and warehousing. The invention takes the northern wood pulp as the main raw material and combines the broad pulp of cloth as the auxiliary raw material, and combines the characteristics of the northern wood pulp that the fiber is long and soft and the bonding force of the fiber is good, so that the prepared paper is fine and soft and has good folding endurance. The invention provides sterile blue medical crepe paper and a preparation method thereof, and the crepe paper has uniform crepe, high wet tensile strength, no decolorization at high temperature, no toxicity, no irritation and good water resistance and bacteria resistance.

Description

Sterile blue medical crepe paper and preparation method thereof

Technical Field

The invention relates to the technical field of special paper, in particular to sterile blue medical crepe paper and a preparation method thereof.

Background

The medical instrument terminal sterilization refers to that the medical instrument is sterilized in a package and can keep an aseptic state under the protection of the package before use, and relates to scenes including the sterilization of disposable aseptic medical instrument production enterprises after packaging products and the sterilization and storage of reusable medical instruments for the next use after packaging and sealing by a hospital disinfection supply center. Compared with the traditional mode of repackaging after sterilization, the terminal sterilization mode strengthens the control of the sterilization sufficiency of the medical apparatus and the contamination risk in the whole flow of transportation, storage and use, and the use safety is obviously improved.

Medical device sterile barrier systems have originated in countries and regions where medical systems are sound, such as the united states, europe, etc., where north america and europe are the primary markets for medical crepe paper. The market scale of the special paper for medical packaging in China is about 12.2 million yuan, and the consumption of the crepe paper is about 5.5 ten thousand tons. Considering the population scale and the development level of a medical service system in China, the market of the medical crepe paper still has a large promotion space.

The PPE wet strength agent is usually adopted to supplement the dry strength and the water-resistant strength of paper for the medical crepe paper on the market at present, the means is single, the prepared medical crepe paper generally has the characteristics of poor water resistance, low strength, hair and powder falling and the like, and the medical crepe paper also has the defects of poor bacterium inhibition effect, skin irritation and the like.

Disclosure of Invention

In order to solve the defects in the background technology, the invention aims to provide sterile blue medical crepe paper and a preparation method thereof. The invention provides sterile blue medical crepe paper and a preparation method thereof, and the crepe paper has uniform crepe, high wet tensile strength, no decolorization at high temperature, no toxicity, no irritation and good water resistance and bacteria resistance.

The purpose of the invention can be realized by the following technical scheme:

the sterile blue medical crepe paper comprises the following pulp proportioning: the pulp comprises 75-95% of main pulp and 5-25% of auxiliary pulp.

Furthermore, the northern wood pulp is processed by taking the cork in the Canada region as a raw material, and has long fiber, light and soft material, thin cell membrane and good fiber bonding force after pulping.

Further, the northern wood pulp is bleached sulfate softwood pulp, and the broad pulp is bleached sulfate hardwood pulp.

A preparation method of sterile blue medical crepe paper comprises the following steps:

firstly, taking northern wood pulp and broad cloth pulp, and pulping the northern wood pulp and the broad cloth pulp by a pulper, wherein the total pulp pulping concentration is 4.5-5.5%;

secondly, pulping the disintegrated fiber raw materials, wherein the pulping degree is 28-29 DEG SR, the wet weight is 9-12g, and blending into a pulp blending tank after pulping;

adding an auxiliary agent into the slurry preparation pool, wherein the auxiliary agent comprises a PPE wet strength agent, cationic starch and a blue pigment;

fourthly, after the slurry is treated, the treated slurry is transferred into a fore-stock tank, and a medium-alkali sizing agent is added into the fore-stock tank;

fifthly, sizing the pulp obtained in the fourth step after two times of pulp washing and dilution, wherein the sizing concentration is 0.05-0.1%, dilute white water is recycled in the pulp washing process, and redundant white water is sent to a sewage treatment system;

sixthly, wrinkling by using a Yankee dryer scraper, wherein the angle between the wrinkling scraper and the tangent line of the cylinder surface is 40-50 degrees, the edge angle of the scraper on the cylinder-attached surface is 75 degrees, and the moisture of the paper before wrinkling is 20-30 percent;

and seventhly, molding, squeezing, drying, calendaring, reeling, finally inspecting, cutting, packaging and warehousing.

Further, the water for disintegration in the first step is tap water or reuse water in the production process.

Further, the PPE wet strength agent in the third step accounts for 10-15% of the weight of the total absolute dry slurry, the solid content is 12.5 +/-0.5%, and the pH value is 3-5;

the cationic starch accounts for 1-2% of the total weight of the oven-dry slurry, the whiteness is more than or equal to 80%, the water content is less than or equal to 15%, the PH value is 6-9, and the substitution degree is more than or equal to 0.02;

the blue pigment accounts for 0.2 to 0.3 percent of the weight of the total oven dry sizing agent.

Further, the medium-alkaline sizing agent in the fourth step accounts for 0.5-0.8% of the weight of the total absolute dry sizing agent, and is dripped in a low-concentration high-level box through a metering pump, the solid content is more than or equal to 10%, the PH value is 2-4, and the viscosity is less than or equal to 20mpa · s.

The invention has the beneficial effects that:

the invention uses the northern wood pulp as a main raw material and combines the broad pulp as an auxiliary raw material, and combines the characteristics of long and soft fiber and good fiber bonding force of the northern wood pulp, so that the prepared paper is fine and soft and has good folding resistance.

The invention adopts a Yankee dryer scraper for wrinkling, the angle between the wrinkling scraper and the tangent line of the cylinder surface is 40-50 degrees, the edge angle of the scraper on the cylinder surface is 75 degrees, the moisture of paper before wrinkling is 20-30 percent, the control of the moisture and the wrinkling scraper ensures that the manufactured paper is evenly wrinkled, and simultaneously the wrinkling rate is limited, so that the product has better appearance and hand feeling.

According to the invention, the PPE wet strength agent is added into the slurry, so that the longitudinal and transverse wet tensile strength and stiffness of the product are improved, and the water resistance and the bacteria resistance are improved.

And fourthly, cationic starch is added into the pulp, so that the fiber bonding force between the pulp is increased, and the strength and the folding strength of the product are improved.

Fifthly, the medium-alkaline sizing agent is dripped into the low-concentration high-level box on line, so that the longitudinal and transverse wet tensile strength and water resistance of the product are further improved, and the bacteria resistance of the product is further improved.

Sixthly, the invention combines the product use experience of users, blue dye is added into the pulp for dyeing, and the paper forming ration is limited to 45-60g/m²And the thickness is 0.11-0.17mm, so that the waterproof effect is optimal.

And seventhly, the raw materials of the product are all plant fibers, and the used chemical auxiliary agent does not contain any toxic substance and has no irritation to skin.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic flow diagram of a manufacturing process of the present invention;

FIG. 2 shows 45g/m according to the present invention²A technical index schematic diagram of medical crepe paper;

FIG. 3 shows 60g/m of the present invention²Technical indexes of the medical crepe paper are shown schematically.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.

A kind of aseptic blue medical crepe paper, the pulp proportion of the crepe paper is: the pulp comprises 75-95% of main pulp and 5-25% of auxiliary pulp.

The northern wood pulp is processed by taking the soft wood in the Canada region as a raw material, the fiber is longer than the common needle pulp, the material is light and soft, the cell membrane is thin, and the bonding force of the pulped fiber is better than that of the common needle pulp. The northern wood pulp is bleached sulfate softwood pulp, and the cloth broad pulp is bleached sulfate hardwood pulp.

firstly, taking northern wood pulp and broad cloth pulp, and pulping the northern wood pulp and the broad cloth pulp by a pulper, wherein the total pulp pulping concentration is 4.5-5.5%, and the pulping water is tap water or reuse water in the production process;

wherein, the PPE wet strength agent accounts for 10-15% of the total absolute dry slurry weight, the solid content is 12.5 +/-0.5%, and the PH value is 3-5; the longitudinal and transverse wet tensile strength and stiffness of the product are improved, and the water resistance and the bacteria resistance are improved.

The cationic starch accounts for 1-2% of the total weight of the oven-dry slurry, the whiteness is more than or equal to 80%, the water content is less than or equal to 15%, the PH value is 6-9, and the substitution degree is more than or equal to 0.02; the fiber bonding force between the sizing agents is increased, and the strength and the folding strength of the product are increased.

The blue pigment accounts for 0.2-0.3% of the total oven dry pulp weight, and the paper weight is limited to 45-60g/m²And the thickness is 0.11-0.17mm, so that the waterproof effect is optimal.

Fourthly, after the pulp is treated, transferring the treated pulp into a pre-papermaking tank, adding a medium-alkaline sizing agent into the pre-papermaking tank, wherein the medium-alkaline sizing agent accounts for 0.5 to 0.8 percent of the weight of the total absolute dry pulp, dropwise adding the medium-alkaline sizing agent into a low-concentration high-level tank through a metering pump, and the medium-alkaline sizing agent has the solid content of more than or equal to 10 percent, the PH value of 2 to 4 and the viscosity of less than or equal to 20mpa · s; the longitudinal and transverse wet tensile strength and the water resistance of the product are improved, and the bacterium resistance of the product is further improved.

Example 1:

the weight ratio of the northern wood pulp and the broad pulp is respectively 80 percent and 20 percent, the northern wood pulp and the broad pulp are pulped by a pulper, the total pulp pulping concentration is 5.1 percent, then pulping is carried out, the pulping degree is 28 DEG SR, the wet weight is 10g, after the pulping is finished, the northern wood pulp and the broad pulp are transferred into a pulp blending pool, and auxiliaries are added into the pulp blending pool, wherein the auxiliaries comprise PPE wet strength agent, cationic starch and blue pigment.

The pulp is treated and then is transferred into a papermaking front pool, a medium-alkaline sizing agent is added into the papermaking front pool, the pulp is subjected to sizing dilution twice, the sizing concentration is 0.065%, a Yankee dryer scraper is used for wrinkling during wrinkling, the angle between the wrinkling scraper and the tangent line of the cylinder surface is 42 degrees, the cutting angle of the scraper on the cylinder surface is 75 degrees, the paper moisture before wrinkling is 22 percent, and finally, the paper is subjected to forming, squeezing, drying, calendaring, reeling, inspection, slitting, packaging and warehousing.

Example 2:

the weight ratio of the northern wood pulp and the cloth broad pulp is respectively 88 percent and 12 percent, the northern wood pulp and the cloth broad pulp are pulped by a pulper, the total pulp pulping concentration is 4.8 percent, then pulping is carried out, the pulping degree is 28.2 DEG SR, the wet weight is 10.5g, the northern wood pulp and the cloth broad pulp are transferred into a pulp blending pool after pulping is finished, and auxiliaries are added into the pulp blending pool and comprise PPE wet strength agent, cationic starch and blue pigment.

The pulp is treated and then is transferred into a papermaking fore-pit, a medium-alkaline sizing agent is added into the papermaking fore-pit, the pulp is subjected to sizing dilution twice, the sizing concentration is 0.075%, a Yankee dryer scraper is used for wrinkling during wrinkling, the angle between the wrinkling scraper and the tangent line of the cylinder surface is 44 degrees, the cutting angle of the scraper on the cylinder surface is 75 degrees, the water content of paper before wrinkling is 25 percent, and finally, the paper is subjected to forming, squeezing, drying, calendaring, reeling, and finally, inspection, slitting, packaging and warehousing.

Example 3:

the weight ratio of the northern wood pulp and the cloth broad pulp is 84 percent and 16 percent respectively, the northern wood pulp and the cloth broad pulp are pulped by a pulper, the total pulp pulping concentration is 5.0 percent, then pulping is carried out, the pulping degree is 28.7 DEG SR, the wet weight is 9.6g, the pulp is transferred into a pulp blending pool after the pulping is finished, and auxiliaries are added into the pulp blending pool, wherein the auxiliaries comprise PPE wet strength agent, cationic starch and blue pigment.

The pulp is treated and then is transferred into a papermaking front pool, a medium-alkaline sizing agent is added into the papermaking front pool, the pulp is subjected to pulp washing and dilution twice and then is sized, the sizing concentration is 0.088%, a Yankee dryer scraper is used for wrinkling during wrinkling, the angle between the wrinkling scraper and the tangent line of the cylinder surface is 49 degrees, the cutting angle of the scraper on the cylinder surface is 75 degrees, the paper moisture before wrinkling is 28 percent, and finally, the paper is subjected to forming, squeezing, drying, press polishing, reeling, inspection, slitting, packaging and warehousing.

Example 4:

the weight ratio of the northern wood pulp to the cloth broad pulp is 93.5 percent and 6.5 percent respectively, the northern wood pulp and the cloth broad pulp are pulped by a pulper, the total pulp pulping concentration is 5.2 percent, then pulping is carried out, the pulping degree is 28.1 DEG SR, the wet weight is 11.0g, the pulp is transferred into a pulp preparation pool after pulping, and auxiliaries are added into the pulp preparation pool, wherein the auxiliaries comprise PPE wet strength agent, cationic starch and blue pigment.

The pulp is treated and then is transferred into a papermaking fore-pit, a medium-alkaline sizing agent is added into the papermaking fore-pit, the pulp is sized after being diluted by two times of size washing, the sizing concentration is 0.084%, a Yankee dryer scraper is used for wrinkling during wrinkling, the angle between the wrinkling scraper and the tangent line of the cylinder surface is 43 degrees, the cutting edge of the scraper on the cylinder surface is 75 degrees, the paper moisture before wrinkling is 24.5 percent, and finally, the paper is molded, squeezed, dried, calendered, rolled, and finally inspected, cut, packaged and warehoused.

Comparative example 1:

the weight ratio of the northern wood pulp to the broad pulp is 96.5 percent and 3.5 percent respectively, the northern wood pulp and the broad pulp are pulped by a pulper, the total pulp pulping concentration is 5.0 percent, then pulping is carried out, the pulping degree is 26.5 DEG SR, the wet weight is 12.5g, the pulp is transferred into a pulp preparation pool after pulping, and auxiliaries are added into the pulp preparation pool, wherein the auxiliaries comprise PPE wet strength agent, cationic starch and blue pigment.

The pulp is treated and then is transferred into a papermaking front pool, a medium-alkaline sizing agent is added into the papermaking front pool, the pulp is subjected to sizing dilution twice, the sizing concentration is 0.065%, a yankee dryer scraper is used for wrinkling during wrinkling, the angle between the wrinkling scraper and the tangent line of the cylinder surface is 38 degrees, the cutting angle of the scraper on the cylinder surface is 75 degrees, the paper moisture before wrinkling is 20 percent, and finally, the paper is subjected to forming, squeezing, drying, press polishing, reeling, inspection, slitting, packaging and warehousing.

Comparative example 2:

the weight ratio of the northern wood pulp to the broad pulp is 72.5 percent and 27.5 percent respectively, the northern wood pulp and the broad pulp are pulped by a pulper, the total pulp pulping concentration is 5.75 percent, then pulping is carried out, the pulping degree is 27.4 DEG SR, the wet weight is 8.5g, after pulping, the pulp is transferred into a pulp preparing pool, and auxiliaries are added into the pulp preparing pool, wherein the auxiliaries comprise PPE wet strength agent, cationic starch and blue pigment.

The pulp is treated and then is transferred into a papermaking front pool, a medium-alkaline sizing agent is added into the papermaking front pool, the pulp is subjected to pulp washing and dilution twice and then is sized, the sizing concentration is 0.055%, a Yankee dryer scraper is used for wrinkling during wrinkling, the angle between the wrinkling scraper and the tangent line of a cylinder surface is 40 degrees, the cutting angle of the scraper on the cylinder surface is 74 degrees, the paper moisture before wrinkling is 29 percent, and finally, the paper is subjected to forming, squeezing, drying, press polishing, reeling, inspection, slitting, packaging and warehousing.

The crepe papers obtained in examples 1 to 4 and comparative examples 1 to 2 were used for: 1. high-temperature decolorization experiment at 140 ℃; 2. skin irritation test. Meanwhile, the crepe papers obtained in examples 1 to 4 were used for the bacteria-blocking experiments.

Experiment 1:

the crepe papers obtained in examples 1 to 4 and comparative examples 1 to 2 were put in an oven at 140 ℃ for 30 minutes to observe whether the color changed at high temperature.

The experimental results are as follows: the crepe papers of examples 1-4 did not change significantly in color, and the crepe papers of comparative examples 1-2 were yellow and dark in color.

Experiment 2:

the skin irritation of crepe paper was tested with reference to the ISO10993-10:2010 method, the crepe paper being in direct contact with the skin of the rabbit back. The negative control is medical sterilized gauze pieces, and the positive control is sodium dodecyl sulfate.

And (4) experimental conclusion: the crepe papers of examples 1-4 were non-irritating to rabbit skin reaction type and the crepe papers of comparative examples 1-2 were irritating to rabbit skin reaction type.

Bacteria resistance experiment:

with reference to DIN 58953-6: 2016 method for carrying out the microorganism barrier performance experiment-agar contact attack experiment of the product comprises the following steps:

taking 5 parts of a sample to be detected, cutting the sample into sample pieces with the side length of 50mm multiplied by 50mm, and sterilizing the sample pieces for later use;

secondly, transferring the sterilized sample to a sterile plate, and taking 4.5 × 10⁷5 drops of the staphylococcus aureus suspension of cfu/ml, wherein each drop is about 0.1ml, the staphylococcus aureus suspension is uniformly dropped on the outer surface of the sample without touching, and the staphylococcus aureus suspension is dried for 16 hours at the temperature of 19-25 ℃;

thirdly, the inner surface of the contaminated sample wafer is completely paved on the surface of a blood agar plate, and the sample wafer is discarded after 5-6 seconds; culturing the blood agar plate at 37 ℃ for 24h, and observing the growth condition of bacteria;

fourthly, comparison: sampling according to the method, inoculating and drying, contacting an inoculated surface with a blood agar plate as a positive control, contacting an uninoculated sample piece with the blood agar plate as a negative control, and then culturing and observing;

fifthly, evaluating results: if the bacteria-free colony grows on 5 blood agar plates, the antibacterial permeability of the sample packaging material is good; if no more than 5 colonies grow on 5 blood agar plates, taking 20 samples to repeat the test; if no more than 5 colonies grow on 20 blood agar plates, the packaging material passes the test.

Sixthly, the results

Serial number	Number of colonies
		1	0
2	0
		3	0
4	0
		5	0
Negative control	0
		Positive control	Can not count

Seventhly, the method comprises the following steps: and (4) conclusion: the experimental result of the experiment can be accepted.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.

Claims

1. The sterile blue medical crepe paper is characterized in that the pulp ratio of the crepe paper is as follows: the pulp comprises 75-95% of main pulp and 5-25% of auxiliary pulp.

2. The sterile blue medical crepe paper according to claim 1, wherein the northern wood pulp is processed from the raw material of canadian area cork, and has the advantages of long fiber, light and soft material, thin cell membrane and good fiber bonding force after pulping.

3. The sterile blue medical crepe paper according to claim 2, wherein the northern wood pulp is bleached sulfate softwood pulp and the broad wood pulp is bleached sulfate hardwood pulp.

4. A preparation method of sterile blue medical crepe paper is characterized by comprising the following steps:

5. The method for preparing sterile blue medical crepe paper according to claim 4, wherein the water for disintegration in the first step is tap water or recycled water in the production process.

6. The preparation method of sterile blue medical crepe paper according to claim 4, wherein the PPE wet strength agent in the third step accounts for 10-15% of the total absolute dry pulp weight, has a solid content of 12.5 +/-0.5%, and has a pH value of 3-5;

7. The method for preparing sterile blue medical crepe paper according to claim 4, wherein the medium-alkaline sizing agent in step four accounts for 0.5-0.8% of the total weight of the oven-dried pulp, and is dropwise added into a low-concentration high-level tank through a metering pump, wherein the solid content is greater than or equal to 10%, the pH value is 2-4, and the viscosity is less than or equal to 20 mpa-s.