Glass spacing paper as well as preparation method and application thereof

Abstract

The invention relates to the technical field of glass packaging, and discloses glass spacing paper which is provided with wrinkled ridges and wrinkled valleys which are arranged continuously or at intervals in the length direction of the paper, and 10-15 wrinkled ridges are arranged in the length range of every 10 mm of the glass spacing paper. According to the glass spacing paper, paper web fiber bond bonds are broken due to wrinkling treatment, the number of exposed fiber free hydroxyl groups can be increased, the chemical performance of the paper is improved, then the paper is softer and looser, and the moisture absorption performance and the air permeability of the paper are improved; due to the wrinkling treatment, the elongation of the paper can be effectively improved, the toughness of the paper is further improved, the probability of brittle fracture of the paper is reduced, the pH value of the paper can reach 4.8 or below, the impact resistance of the paper can be improved, and a better protection effect on glass can be achieved; in addition, due to the wrinkling treatment, the surface roughness of the paper can be increased, and the surface roughness characteristic is beneficial to enhancing the surface friction coefficient of the glass, so that the glass is prevented from sliding or slipping off.

Description

Technical Field

[0001] The invention relates to the technical field of glass packaging, and in particular to a glass spacer paper and a preparation method and application thereof. Background Art

[0002] Glass spacer paper is a kind of isolation paper used between glass substrates and between glass substrates and inner and outer pads to effectively protect glass substrates from being scratched or moldy during transportation and storage. Glass mold is commonly known as glass weathering. Glass weathering is a surface corrosion phenomenon caused by the absorption of moisture on the surface, which causes the alkali components inside the glass to precipitate. Weathering can be divided into two categories: ① Alkali precipitation on the board surface. The alkali in the glass will reach the glass surface through ion exchange under the action of water vapor and accumulate on the surface to form white spots; ② The board surface is eroded by mold. This kind of weathering often occurs in glass with poor chemical stability.

[0003] Internal causes of glass weathering: Commonly used flat glass is an oxide glass formed by a silicon-oxygen ion structure network. The absence of oxygen ions on the glass surface creates holes, forming the surface free energy of the glass. The existence of surface free energy causes the relative activity of the glass surface, which is reflected in surface tension, friction and surface hygroscopicity, resulting in the easy hydrolysis of surface SiO2, easy decomposition of surface components, easy crystallization of the surface and wettability. External causes of glass weathering: mainly due to the effect of hydrolysis and high ambient temperature. During the storage of glass, a series of complex physical and chemical changes will occur when the glass surface contacts water or air, resulting in weathering phenomena such as color spots, white spots or mist. From the analysis of the mechanism of water on the glass surface, the weathering process can be divided into several stages: water first adsorbs on the glass surface and gradually penetrates inward, potassium silicate and sodium silicate on the glass surface are hydrolyzed to form caustic soda, caustic soda reacts with carbon dioxide in the air to form sodium carbonate, which gathers on the surface. Due to the light hygroscopicity of caustic soda, it will deliquesce into alkali solution, corrode the silicon-oxygen structure of the glass, and finally cause mold areas and depressions on the glass surface. The existing methods to reduce glass weathering are mainly to use acidic mildew inhibitors, neutral mildew inhibitors or mildew-proof isolation powders for moisture-proof and isolation, but this method requires high costs, or to use glass mildew-proof paper, but the existing glass mildew-proof paper on the market has poor mildew-proof effect, and the mildew-proof qualified rate is only 50% after 3 months, and the automatic packaging line of the machine used for glass packaging needs to ensure that the mildew-proof paper has a certain toughness.

[0004] Therefore, how to provide a low-cost, high-toughness glass spacer paper that can effectively prevent glass from mildew is a problem that those skilled in the art urgently need to solve. Summary of the invention

[0005] In view of this, the present invention provides a glass spacer paper to solve the problems of poor effect, poor toughness and high cost of existing glass anti-mildew methods.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] On the one hand, the present invention provides a glass spacer paper, which has continuous or intermittently arranged corrugated ridges and corrugated valleys along the length direction of the paper; the glass spacer paper meets the following conditions: 10-15 corrugated ridges are arranged within the length range of 10 mm of the glass spacer paper.

[0008] Preferably, after the fiber bonds inside the glass spacer paper are broken, they are arranged along the morphology of the wrinkle ridges and the wrinkle valleys.

[0009] Preferably, the paper thickness of the glass spacer paper is 0.045-0.065 mm, and the distance between the upper and lower end surfaces of the wrinkle ridges and the wrinkle valleys is 0.12-0.16 mm.

[0010] Preferably, the air permeability of the glass spacer paper is ≥4000 ml / min, the relative humidity is ≥350%, preferably ≥400%, and the pH value is less than 4.8.

[0011] On the other hand, the present invention also provides a method for preparing the glass spacer paper described in any one of the above items, comprising the following steps:

[0012] (1) Mix 15-85% softwood pulp and 85-15% hardwood pulp, crush, swell and then beat;

[0013] (2) adding additives to the pulp obtained in step (1);

[0014] (3) Papermaking at a concentration of 0.4-0.6%;

[0015] (4) forming a paper web with a water content of 40-50% through a wire section and a press section;

[0016] (5) The wrinkling process is carried out on the wrinkling device. After the wrinkling requirements are met, the product is dried by multiple cylinders in the drying section and then rolled up.

[0017] Preferably, the adjustment range of the beating degree in step (1) is 25-70°SR, the beating concentration is 3-5%, and the wet weight is 3.5-12 g.

[0018] Preferably, the coniferous pulp in step (1) is bleached pulp or unbleached pulp; and the broadleaf pulp is bleached pulp or unbleached pulp.

[0019] Preferably, the additives added in step (2) include, per ton of absolute dry pulp, 5-30 kg of sizing agent, 5-15 kg of preservative, 10-20 kg of mildew preventer, 10-20 kg of wet strength agent, 40-60 kg of aluminum sulfate, and 10 kg of retention aid.

[0020] Furthermore, the present invention also provides a use of any of the above-mentioned glass spacing papers in preventing glass from mildew.

[0021] The present invention provides a glass spacer paper, which has the following beneficial effects compared with the prior art:

[0022] The glass spacer paper of the present invention has a wrinkling treatment that causes the fiber bonds of the paper web to break, thereby making the paper softer and looser, increasing the number density of hydroxyl groups, and improving its hygroscopicity and air permeability. The main feature is that the hygroscopicity and air permeability can be adjusted by adjusting the wrinkling rate or thickness of the paper; the wrinkling treatment can effectively improve the elongation of the paper, thereby improving the toughness of the paper, reducing the probability of brittle fracture of the paper, so that the pH value of the paper can reach below 4.8, and can improve the impact resistance of the paper, thereby forming a better protective effect on the glass; in addition, the wrinkling treatment can increase the roughness of the paper surface, and the rough surface property is conducive to enhancing the friction coefficient of the glass surface, preventing the glass from sliding or falling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 This is a diagram showing the usage status of conventional glass spacer paper;

[0025] Figure 2 This is a diagram showing the use status of the glass spacer paper of the present invention;

[0026] Figure 3 is a cross-sectional view of the glass spacer paper of the present invention;

[0027] Figure 4 is a schematic diagram of the structure of a wrinkling device;

[0028] Figure 5 It is a schematic diagram of the structure of the wrinkling scraper;

[0029] Figure 6 This is the mildew test result diagram of Comparative Example 5, showing mildew on the surface;

[0030] Figure 7 This is the mildew test result diagram of Example 1, the surface is clean and free of mildew;

[0031] Figure 8 Schematic diagram of the creping process used in the middle section of the drying section of a multi-cylinder paper machine.

[0032] In the figure:

[0033] 10-glass spacer paper, 11-wrinkle ridge, 12-wrinkle valley, 100-glass, 20-pressing part, 201-pressing stone roller, 202-pressing rubber roller, 203-paper guide roller, 21-wrinkling part, 211-wrinkling roller shaft, 212-adhesion roller shaft, 213-wrinkling scraper, 214-arc roller, 215-adjusting roller shaft, 22-drying part, 221-drying cylinder, 31-temperature-adjusting drying cylinder, 32-pressing roller, 33-rubber blanket. DETAILED DESCRIPTION

[0034] The present invention will be described below by specific examples, and it will be appreciated by those skilled in the art that the following specific examples are only for illustrative purposes, and do not limit the scope of the present invention in any way. In addition, in the following examples, unless otherwise specified, the reagents and equipment used are all commercially available. If in the following examples, specific treatment conditions and treatment methods are not clearly described, then conditions and methods known in the art can be used to process.

[0035] In one aspect of the present invention, the present invention provides a glass spacer paper, such as Figure 2-3 As shown, the glass spacer paper 10 has continuous or intermittently arranged corrugated ridges 11 and corrugated valleys 12 along the length direction of the paper. The fiber bonding bonds inside the glass spacer paper 10 are broken and arranged along the corrugated ridges 11 and corrugated valleys 12.

[0036] The wrinkling process makes the paper loose and soft, which can increase the number of free hydroxyl groups in the fiber and the density of free hydroxyl groups in the fiber. The inside of the paper is a loose fiber structure with a large number of pores, which improves the hygroscopicity of the paper. The water vapor on the glass surface enters the pores inside the paper to ensure the dryness of the glass surface. The outside of the paper is a wavy structure full of grooves, so there is enough space between adjacent glass, which improves the air permeability and enhances the air flow between adjacent glass surfaces. At the same time, it takes away some of the moisture absorbed by the paper itself, so that the paper can quickly and effectively absorb moisture for a long time. The hygroscopicity and air permeability of the paper work at the same time, thus creating a low-moisture environment on the glass surface, preventing water vapor from condensing on the glass surface, and inhibiting the occurrence of mildew.

[0037] In addition, due to the corrugation treatment, the elongation of the paper can be effectively improved, thereby improving the toughness of the paper and reducing the probability of brittle fracture of the paper, so that the pH value of the paper can reach below 4.8, and the impact resistance of the paper can be improved, forming a better protective effect on the glass, preventing damage caused by squeezing between adjacent glasses; and because the corrugation treatment can increase the roughness of the paper surface, the rough surface characteristics are conducive to enhancing the friction coefficient of the glass surface and preventing the glass from sliding or sliding.

[0038] Specifically, the corrugation treatment of paper breaks the fiber bonds of the paper web, increases the free hydroxyl groups of the paper, and enhances the hydrophilicity of the paper, thereby reducing the residence time of water on the glass surface. At the same time, the corrugation treatment of paper breaks the fiber bonds of the paper web, and improves the softness and looseness of the paper, which provides a favorable prerequisite for lowering the pH value of the paper, so that the paper can function effectively within the pH range of 4-4.8 without becoming brittle under low pH conditions.

[0039] In some embodiments of the present invention, the paper thickness a1 of the glass spacer paper 10 is 0.045-0.065 mm, for example, it can be 0.045 mm, 0.055 mm, 0.065 mm, etc.; the distance a2 between the upper and lower end surfaces of the wrinkle ridge 11 and the wrinkle valley 12 is 0.12-0.16 mm, for example, it can be 0.12 mm, 0.14 mm, 0.16 mm, etc.

[0040] It can be understood that the thickness of the glass spacer paper 10 before wrinkling is 0.045-0.065 mm, and due to the wrinkling process, the thickness of the wrinkle ridges 11 and the wrinkle valleys 12 is 0.12-0.16 mm. Figure 1 As shown, the thickness a3 of conventional ordinary glass 100 paper is 0.08-0.1 mm. In comparison, the present invention uses paper with a thinner initial thickness to construct a thicker glass spacing paper 10, which has better looseness and softness, leaves enough space between the glasses 100, has good air permeability, and enhances the air flow between adjacent glasses 100.

[0041] In some embodiments of the present invention, the glass spacer paper 10 meets the following conditions: 10-15 ridges 11 are provided within every 10 mm of the length of the glass spacer paper 10 , for example, 10, 11, 12, 13 or 15 ridges 11 are provided.

[0042] When the wrinkling ratio is 10-15%, the air permeability, hygroscopicity, elongation and friction resistance of the glass spacer paper are all optimal. Specifically, the air permeability of the glass spacer paper is ≥4000ml / min, and can reach a maximum of 7800ml / min; the relative humidity is ≥350%, preferably ≥400%, and can reach a maximum of 429%; the pH value is less than 4.8, and the optimal value can reach 4.2. If the pH value of ordinary paper is lower than 4.8, it will cause the paper to be brittle, weak in strength, easy to break, and poor in usability. The glass spacer paper of the present invention has the characteristics of being softer and looser than ordinary paper, so it can make the pH value of the paper lower, and can neutralize the alkaline ions on the glass surface to a greater extent to prevent mildew.

[0043] The glass spacer paper 10 of the present invention is processed by a corrugating device, such as Figure 4-5As shown, the corrugating device includes a pressing section 20, a corrugating section 21 and a drying section 22 which are sequentially arranged along the paper conveying direction; the corrugating section 21 includes a corrugating roller 211, an adhesive roller 212 for pressing and gluing the paper onto the corrugating roller 211, a corrugating scraper 213 for scraping the paper off the surface of the corrugating roller 211, and an arc roller 214 and an adjusting roller 215 arranged downstream of the corrugating scraper 213; the speed of the adhesive roller 212 and the corrugating roller 211 rolling the paper is V1, and the paper guiding speed of the adjusting roller 215 is V2, which is less than V1, so that the paper web enters the drying section 22 for drying in a corrugated state; the drying section 22 includes a plurality of drying cylinders 221; the pressing section 20 includes a pressing stone roller 201, a pressing rubber roller 202 and a paper guide roller 203 rolling against each other.

[0044] Optionally, the corrugating device mainly realizes the corrugation of the glass spacer paper 10 through the corrugating part 21. The paper web is pressed and adhered to the corrugating roller 211 through the adhesive roller 212, and reaches the corrugating scraper 213 at a linear speed of V1. The scraper is attached to the side of the corrugating roller 211 to scrape the paper off the surface of the corrugating roller 211. The regulating roller 215 guides the scraped paper web into the drying part 22 at a linear speed of V2. Since V2 is less than V1, the paper web is wrinkled at the corrugating scraper 213. By strictly controlling V1 and V2, the wrinkle percentage can be controlled to ensure that there are 10-15 wrinkle waves per 10 mm length.

[0045] Optionally, the blade contact angle α is 21-25°, the blade horizontal angle β is 45-55°, the cutting angle δ is 100-115°, and the output angle θ is 100-115°.

[0046] It should be noted that the glass interlayer paper of the present invention can be prepared by other conventional corrugating processes in the art. For example, dry mechanical scraper corrugation (similar to the above-mentioned wet scraper corrugation) is adopted on a Yankee dryer, and reference can be made to the prior patent record scheme with the announcement number CN116234484A, such as Figure 8 As shown, a corrugating process is used in the middle section of the drying section of a multi-cylinder paper machine. When the temperature-adjusting drying cylinder 31 is in operation, the pressure roller 32 exerts pressure on the rubber blanket 33. The rubber blanket 33 resting on the surface of the adjusting cylinder is compressed, stretched and deformed. When the rubber blanket 33 is in operation, it is squeezed and rebounded on the surface of the drying cylinder, thereby rubbing the paper with a moisture content of about 30-36% on the surface of the drying cylinder, causing the paper to be corrugated. In this way, crepe paper with similar performance can also be produced.

[0047] The glass spacer paper of the present invention can be prepared by the following process:

[0048] The present invention also provides a method for preparing the glass spacer paper described in any one of the above items, comprising the following steps:

[0049] (1) Mix 15-85% coniferous pulp and 85-15% broadleaf pulp, crush them, swell them, and then beat them.

[0050] In this step, the beating degree is adjusted in the range of 25-70°SR, the beating concentration is 3-5%, and the wet weight is 3.5-12 grams; the coniferous pulp is bleached pulp or natural pulp, and the broadleaf pulp is bleached pulp or natural pulp.

[0051] (2) Adding additives to the pulp obtained in step (1).

[0052] In this step, the additives are added in amounts per ton of absolute dry pulp including: 5-30 kg of sizing agent in the pulp, 5-15 kg of preservative, 10-20 kg of mildew preventer, 10-20 kg of wet strength agent, 40-60 kg of aluminum sulfate, and 10 kg of retention aid.

[0053] (3) Papermaking at a concentration of 0.4-0.6%;

[0054] (4) forming a paper web with a water content of 40-50% through a wire section and a press section;

[0055] (5) The wrinkling process is carried out on the wrinkling device. After the wrinkling requirements are met, the product is dried by multiple cylinders in the drying section and then rolled up.

[0056] In this step, a paper web with a water content of 40-50% passes between the adhesive roller and the corrugating roller, and the speed at which the adhesive roller and the corrugating roller roll the paper is V1; the corrugating scraper is attached to the side of the corrugating roller to scrape the paper off the surface of the corrugating roller, and the adjusting roller guides the scraped paper web into the drying section, and the paper guiding speed of the adjusting roller is V2, V2 is less than V1 and (V1-V2) / V2*100%=10-15%, so that the paper web enters the drying section in a corrugated state for drying.

[0057] The glass spacer paper of the present invention is described below by means of specific examples, wherein the glass spacer paper of each example and comparative example adopts Figure 4 The device shown, wherein the blade contact angle α = 25°, the blade horizontal angle β = 50°, the cutting angle δ = 110°, and the output angle θ = 110°;

[0058] The glass interlayer paper of each embodiment and comparative example adopts the following preparation process: (1) preparing pulp: 60% coniferous pulp and 40% broadleaf pulp are mixed, crushed, swollen, and the beating degree is adjusted to 25-70°SR, the beating concentration is 3-5%, and the wet weight is 3.5-12 grams; (2) additives are added to the pulp obtained in step (1), and the additives are added in an amount of 20kg of pulp sizing agent, 10kg of preservative (WF089), 15kg / ton of mildewproof agent, 15kg / ton of wet strength agent (PAE), 50kg of aluminum sulfate (pH regulator), and 10kg of retention aid (M302) per ton of absolute dry pulp; (3) putting paper on the screen at a concentration of 0.5%; (4) forming a paper web with a water content of 40-50% through the screen section and the pressing section; (5) carrying out the corrugation process on the corrugation device to meet the corrugation requirements, and winding up after multi-cylinder drying in the drying section.

[0059] It should be noted that the parameter values ​​involved above are only to ensure the uniformity of the preparation process and preparation device of the embodiment and the comparative example and reduce the influencing factors, but do not affect the other parameter conditions to be able to prepare the glass spacer paper.

[0060] Example 1

[0061] The glass spacer paper of this embodiment has a thickness of 0.045 mm, a distance between upper and lower end surfaces of the corrugated ridges and the corrugated valleys is 0.12 mm, and 15 corrugated ridges are provided within every 10 mm length of the glass spacer paper.

[0062] Example 2

[0063] The glass spacer paper of this embodiment has a thickness of 0.055 mm, a distance between upper and lower end surfaces of the corrugated ridges and the corrugated valleys is 0.14 mm, and 13 corrugated ridges are provided within a length range of every 10 mm of the glass spacer paper.

[0064] Example 3

[0065] The glass spacer paper of this embodiment has a thickness of 0.065 mm, a distance between upper and lower end surfaces of the corrugated ridges and the corrugated valleys is 0.16 mm, and 10 corrugated ridges are provided within every 10 mm length of the glass spacer paper.

[0066] Comparative Example 1

[0067] The glass spacer paper of this comparative example has a paper thickness of 0.040 mm, a distance between upper and lower end surfaces of the corrugated ridges and the corrugated valleys of 0.14 mm, and 13 corrugated ridges are provided within a length range of 10 mm of the glass spacer paper.

[0068] Comparative Example 2

[0069] The glass spacer paper of this embodiment has a thickness of 0.055 mm, a distance between upper and lower end surfaces of the corrugated ridges and the corrugated valleys is 0.14 mm, and 16 corrugated ridges are provided within every 10 mm length of the glass spacer paper.

[0070] Comparative Example 3

[0071] The glass spacer paper of this embodiment has a thickness of 0.055 mm, a distance between upper and lower end surfaces of the corrugated ridges and the corrugated valleys is 0.14 mm, and 8 corrugated ridges are provided within every 10 mm length of the glass spacer paper.

[0072] Comparative Example 4

[0073] The glass spacer paper of this embodiment has a thickness of 0.070 mm, a distance between upper and lower end surfaces of the corrugated ridges and the corrugated valleys is 0.14 mm, and 13 corrugated ridges are provided within a length range of 10 mm of the glass spacer paper.

[0074] Comparative Example 5

[0075] This comparative example is ordinary glass spacer paper that has not been subjected to the wrinkling treatment of step (5).

[0076] A series of tests were conducted on the glass spacer papers of Examples 1-3 and Comparative Examples 1-5. The results are shown in Table 1:

[0077] Table 1

[0078]

[0079]

[0080] Note: The test method of absorption rate is as follows: in the test room with a temperature of 25°C and an air humidity of 75%, take the glass spacer paper of the embodiment and the comparative example of the same gram weight into a standard size and quantitative shape, and put them in a 140°C oven to dry for 30 minutes. Place a 10*10cm glass on each standard electronic quantitative meter (at this time, the glass absorbs natural moisture in the air), set it to zero, take it out immediately after half an hour (at this time it is the absolute dry weight of the paper) and put it on the glass surface, and record the weight change within 30 seconds.

[0081] It can be seen from Table 1 that, compared with the glass spacer paper that has not been corrugated, the glass spacer paper treated with corrugation of the present invention has faster moisture absorption, higher air permeability, and lower pH value.

[0082] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A glass spacer paper, characterized in that: The glass spacer paper has continuous or intermittently arranged wrinkle ridges and wrinkle valleys along the length direction of the paper; There are 10-15 wrinkle ridges within every 10 mm length of the glass spacer paper.

2. The glass spacer paper according to claim 1, characterized in that: After the fiber bonds inside the glass spacer paper are broken, they are arranged along the morphology of the wrinkle ridges and the wrinkle valleys.

3. The glass spacer paper according to claim 1, characterized in that: The paper thickness of the glass spacer paper is 0.045-0.065 mm, and the distance between the upper and lower end surfaces of the wrinkle ridge and the wrinkle valley is 0.12-0.16 mm.

4. The glass spacer paper according to claim 1, characterized in that: The air permeability of the glass spacer paper is ≥4000 ml / min, the relative humidity is ≥350%, and the pH value is less than 4.

8.

5. A method for preparing the glass spacer paper according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) Mix 15-85% softwood pulp and 85-15% hardwood pulp, crush, swell and then beat; (2) adding additives to the pulp obtained in step (1); (3) Papermaking at a concentration of 0.4-0.6%; (4) forming a paper web with a water content of 40-50% through a wire section and a press section; (5) The wrinkling process is carried out on the wrinkling device. After the wrinkling requirements are met, the product is dried by multiple cylinders in the drying section and then rolled up.

6. The method for preparing glass spacer paper according to claim 5, characterized in that: The adjustment range of the beating degree in step (1) is 25-70°SR, the beating concentration is 3-5%, and the wet weight is 3.5-12 grams.

7. The method for preparing glass spacer paper according to claim 5, characterized in that: In step (1), the coniferous pulp is bleached pulp or unbleached pulp; and the broadleaf pulp is bleached pulp or unbleached pulp.

8. The method for preparing glass spacer paper according to claim 5, characterized in that: The additives added in step (2) include, per ton of absolute dry pulp, 5-30 kg of sizing agent, 5-15 kg of preservative, 10-20 kg of mildew preventer, 10-20 kg of wet strength agent, 40-60 kg of aluminum sulfate and 10 kg of retention aid.

9. Use of the glass spacer paper according to any one of claims 1 to 4 or the glass spacer paper prepared by the method according to any one of claims 5 to 8 in preventing glass from mildew.

Images