Method and apparatus for packaging glass sheets together with interleaving paper.

Abstract

The packaging apparatus and method include positioning two or more glass sheets in a packaging apparatus and disposing an interleaf between adjacent glass sheets of the two or more glass sheets, the interleaf having a total lignin content of at least about 5 weight percent.

Description

Description of Related Applications

[0001] This application claims the benefit of priority under 35 U.S.C. § 119 to U.S. Provisional Patent Application No. 63 / 190501, filed May 19, 2021, the contents of which are relied upon and are hereby incorporated in their entirety by reference.

Technical Field

[0002] The present disclosure broadly relates to methods and apparatus for packaging a glass sheet with interleaving paper.

Background Art

[0003] In the packaging and transportation of glass sheets such as glass sheets used for display applications, an interleaving paper material such as interleaving paper is commonly sandwiched between the sheets to help protect the glass sheet from damage. The interleaving paper material is designed not only to provide physical protection but also to minimize the transfer of contaminants onto the glass surface. In addition, such an interleaving paper material should not impart an undesirable level of charge to the glass or adhere to the glass surface undesirably. Further, such a material should function well over time in various different environments such as varying temperature and / or humidity conditions.

Summary of the Invention

Problems to be Solved by the Invention

[0004] There is a continuing need for an interleaving paper material that meets these and other requirements in a cost-effective manner.

Means for Solving the Problems

[0005] The embodiments disclosed herein include a method of packaging a glass sheet. The method includes positioning two or more glass sheets within a packaging apparatus. The method also includes placing interleaving paper between adjacent ones of the two or more glass sheets. The interleaving paper has a total lignin content of at least about 5 weight percent.

[0006] The embodiments disclosed herein also include a packaging device, which includes two or more glass sheets positioned therein. The packaging device also includes interleaving paper placed between adjacent glass sheets of the two or more glass sheets, which has a total lignin content of at least about 5 mass percent.

[0007] Additional features and advantages of the embodiments disclosed herein are described in the following detailed description, some of which will be readily apparent to those skilled in the art from that description, or will be recognized by carrying out the embodiments of the disclosure described herein, including the following detailed description, claims, and accompanying drawings.

[0008] It should be understood that both the preceding general description and the following detailed description present embodiments intended to provide an overview or framework for understanding the nature and features of the embodiments described in the claims. The accompanying drawings are included for further understanding and constitute part of this specification. The drawings illustrate various embodiments of this disclosure and, together with the description, serve to illustrate their principles and operation. [Brief explanation of the drawing]

[0009] [Figure 1] Side perspective view of an illustrative packaging device according to the embodiments disclosed herein. [Figure 2] Side perspective view of a packing device in which multiple glass sheets and interleaving paper placed between adjacent glass sheets are shown in an example of the embodiments disclosed herein. [Figure 3] Perspective view of an exemplary glass sheet according to the embodiments disclosed herein [Figure 4] Perspective view of an example interleaving paper according to the embodiments disclosed herein. [Figure 5] Chart showing the water contact angle of the main surface of glass sheets after contact degradation over time and after contact degradation over time and subsequent cleaning, for various interleaving papers. [Figure 6]Charts showing particle density on the main surface of glass sheets after contact and after contact and subsequent washing for various interleaving papers. [Figure 7] Chart showing the zeta potential of glass sheets after contact with various interleaving papers. [Figure 8A] Chart showing the surface concentration of magnesium ions for various interleaving papers. [Figure 8B] Chart showing the surface concentration of aluminum ions in various interleaving papers. [Modes for carrying out the invention]

[0010] Herein, we refer in detail to currently preferred embodiments of the present disclosure, which are shown in the accompanying drawings. Wherever possible, the same reference numerals are used across the drawings to refer to the same or similar parts. However, the present disclosure can be embodied in many different forms and should not be considered limited to the embodiments described herein.

[0011] A range may be expressed herein as "approximately" from one specific value and / or "approximately" from another specific value. Where such a range is expressed, another embodiment includes that one specific value and / or the other specific value. Similarly, where a value is expressed as an approximation, for example by the use of the antecedent "approximately," it will be understood that a specific value forms another embodiment. It will further be understood that each endpoint of a range is significant both in relation to the other endpoint and independently of the other endpoint.

[0012] The directional terms used here—for example, up, down, right, left, front, back, top, bottom—are used only in reference to the depicted drawing and are not intended to imply an absolute orientation.

[0013] Unless otherwise specified, none of the methods described herein are intended to be interpreted as requiring the steps to be performed in a specific order, nor are any apparatuses required to have a specific orientation. Therefore, if a claim for a method does not actually list the order in which the steps should be performed, or if a claim for an apparatus does not actually enumerate the order or orientation of the individual components, or if it is not otherwise specifically stated in the claim or description that the steps should be limited to a specific order, or if no specific order or orientation of the components of the apparatus is enumerated, no order or orientation is ever implied. This applies to any possible non-expressive criteria for interpretation, including the arrangement of steps, the flow of operations, the order of components, or the orientation of components; the obvious meaning derived from grammatical construction or punctuation; and logical matters relating to the number or type of embodiments described in the specification.

[0014] As used here, nouns include multiple objects unless the context clearly indicates otherwise. Therefore, for example, a reference to a component includes a form having two or more such components unless the context clearly indicates otherwise.

[0015] As used herein, the term lignin refers to a cross-linked phenolic biopolymer having a weight-average molecular weight of at least about 5,000 grams per mole.

[0016] As used herein, the term polysaccharide refers to high-molecular-weight carbohydrates that have monosaccharide units linked by glycosidic bonds. Examples include cellulose, amylose, glucan, xylan, mannan, arabinan, and galactan.

[0017] As used herein, the term "two month aging procedure with the paper interleaf" refers to the test method described herein, which involves weighting a laminate having a paper interleaf disposed between adjacent glass sheets at about 54% relative humidity and about 20°C for two months, then separating the glass sheets from the paper interleaf, subsequently washing the glass sheets with an aqueous solution containing about 1% Semiclean KG for about 1 minute, then rinsing in deionized water for about 1 minute, and repeating this twice.

[0018] As used herein, the term "vibration procedure with the paper interleaf" refers to the test method described herein, which involves placing a paper interleaf between adjacent glass sheets, vibrating using the Telecordia Standard, then separating the glass sheets from the paper interleaf, subsequently washing the glass sheets with an aqueous solution containing about 4% Semiclean KG for about 12 minutes at about 70°C under ultrasonic waves, and then rinsing in deionized water for 12 minutes at about 70°C under ultrasonic waves.

[0019] As used herein, the term "streaming potential procedure with the paper interleaf" refers to the test method described herein, which involves placing a paper interleaf on a glass sheet at about 54% relative humidity and about 20°C for a period of about 24 hours, and then separating the glass sheet from the paper interleaf.

[0020] As used herein, the term "fogging procedure with the paper interleaf" refers to the test method described herein, in which a perforated paper interleaf is placed on a glass sheet at about 54% relative humidity and about 20°C for a period of about 24 to 48 hours, then the paper interleaf is removed, the glass sheet is exposed to steam, and then the glass sheet is washed with an aqueous solution containing about 1% Semiclean KG for about 1 minute, followed by rinsing in deionized water for about 1 minute, and then the glass sheet is further exposed to steam.

[0021] As used herein, the term "Mura defects" is known to those skilled in the art and refers to non-uniformities visible on the surface, for example, as described in U.S. Patent No. 5,917,935.

[0022] FIG. 1 shows a side perspective view of an exemplary packaging apparatus 100 according to the embodiments disclosed herein. The packaging apparatus 100 includes a cover 102, a support member 104, a base 106, a pallet 108, and at least one support column 110. The packaging apparatus 100 is configured to surround a plurality of glass sheets positioned therein.

[0023] In one exemplary embodiment, the cover 102 can be made of metal, polymer, polymer composite, and / or metal / polymer laminate. In one exemplary embodiment, the support member 104, the base 106, the pallet 108, and / or the support column 110 can be made of a metal such as aluminum or stainless steel, or a polymer composite.

[0024] Figure 2 shows a side perspective view of a plurality of glass sheets 10 and interleaving paper 20 placed between adjacent glass sheets 10 in an exemplary packaging device 100 according to the embodiments disclosed herein. The glass sheets 10 and interleaving paper 20 are positioned on a cushioning member 112, which is then positioned on a base 106, and the cushioning member 112 may be bonded to the base 106 with a suitable adhesive. The cushioning member 112 may be made from an elastic polymer material, such as a material containing ethylene-propylene-diene terpolymer.

[0025] Figure 3 shows a perspective view of an exemplary glass sheet 10 according to the embodiments disclosed herein. The glass sheet 10 has a first main surface 12, an opposite second main surface 14 extending substantially parallel to the first main surface 12 (on the opposite side of the glass sheet 10 from the first main surface 12), and an edge surface 16 extending between the first main surface 12 and the second main surface 14 and extending substantially perpendicular to the first and second main surfaces 12 and 14.

[0026] Figure 4 shows a perspective view of an example interlayer 20 according to the embodiment disclosed herein. The interlayer 20 has a first main surface 22 and an opposite second main surface 24 extending substantially parallel to the first main surface 22 (on the opposite side of the interlayer 20 from the first main surface 22).

[0027] Embodiments disclosed herein include interleaving paper 20 having a total lignin content of at least about 5 mass percent, including at least about 10 mass percent, at least about 15 mass percent, and at least about 20 mass percent, including about 5 mass percent to about 40 mass percent, further including about 10 mass percent to about 35 mass percent, and further including about 20 mass percent to about 30 mass percent.

[0028] Embodiments disclosed herein include interleaving paper 20 having a total polysaccharide content of about 80 mass percent or less, including about 40 mass percent to about 80 mass percent, further including about 45 mass percent to about 75 mass percent, further including about 50 mass percent to about 70 mass percent, about 75 mass percent or less, further about 70 mass percent, and further about 65 mass percent or less.

[0029] Table 1 summarizes the content of five types of interpaper, the first two being comparative interpapers and the last three being illustrative interpapers according to the embodiments disclosed herein. The comparative interpapers are labeled "Paper 1" and "Paper 2" in Table 1, and are specifically commercially available polysaccharide interpapers. The illustrative interpapers are labeled "Paper 3," "Paper 4," and "Paper 5" in Table 1, and are specifically commercially available recycled newspaper ("Paper 3") and commercially available unused (virgin) newspaper ("Paper 4" and "Paper 5"). The composition of the papers was determined by subjecting approximately 30 grams of each paper to bulk lignocellulose analysis under the Celignis Biomass Analysis Laboratory P10 protocol.

[0030] [Table 1]

[0031] The glass sheet 10 may be made from various glass compositions. For example, the embodiments disclosed herein include a glass sheet 10 made from an alkali-free glass composition containing 58-65 mass percent (mass%) of SiO2, 14-20 mass percent of Al2O3, 8-12 mass percent of B2O3, 1-3 mass percent of MgO, 5-10 mass percent of CaO, and 0.5-2 mass percent of SrO. The glass sheet 10 may also be made from an alkali-free glass composition containing 58-65 mass percent of SiO2, 16-22 mass percent of Al2O3, 1-5 mass percent of B2O3, 1-4 mass percent of MgO, 2-6 mass percent of CaO, 1-4 mass percent of SrO, and 5-10 mass percent of BaO. In addition, the glass sheet 10 may be made from an alkali-free glass composition containing 57-61% by mass of SiO2, 17-21% by mass of Al2O3, 5-8% by mass of B2O3, 1-5% by mass of MgO, 3-9% by mass of CaO, 0-6% by mass of SrO, and 0-7% by mass of BaO. The glass sheet 10 may also be made from an alkali-containing glass composition containing 55-72% by mass of SiO2, 12-24% by mass of Al2O3, 10-18% by mass of Na2O, 0-10% by mass of B2O3, 0-5% by mass of K2O, 0-5% by mass of MgO, and 0-5% by mass of CaO, and in some embodiments, may also contain 1-5% by mass of K2O and 1-5% by mass of MgO.

[0032] In one exemplary embodiment, the glass sheet 10 has a thickness of less than 1 millimeter, including thicknesses ranging from about 0.1 millimeters to about 1 millimeter, including about 0.5 millimeters, about 0.2 millimeters to about 0.8 millimeters, and further including about 0.3 millimeters to about 0.7 millimeters. [Examples]

[0033] The embodiments disclosed herein will be further described by the following non-limiting examples.

[0034] Example 1: A two-month aging procedure for interleaving paper was performed over a period of two months at approximately 54% relative humidity and approximately 20°C, with a load of approximately 5 kilograms applied to a laminate consisting of clean Corning® Eagle XG® glass sheets (with a main surface area of ​​approximately 4 inches x 4 inches (approximately 10 cm x 10 cm)) with interleaving paper in between. Next, the glass sheets and interleaving paper were separated, and the glass sheets were subsequently washed for approximately 1 minute in an aqueous solution containing approximately 1% Semiclean KG (manufactured by Yokohama Oil & Fat Industry Co., Ltd.), followed by rinsing in deionized water for approximately 1 minute, and this was repeated twice. This procedure was performed on five types of interleaving paper, specifically Paper 1, Paper 3, Paper 4, and Paper 5, as previously described in Table 1, as well as additional commercially available unused newspaper ("Paper 6"). The water contact angle of the main surface of each glass sheet in contact with the interpaper was measured before and after the washing and rinsing process by measuring the angle formed between the glass surface and a water droplet of approximately 2 microliters, determined using a Kruss DSA 100E Drop Shape Analyzer (5 measurements per sample). The results are shown in Figure 5. As can be seen from Figure 5, after the washing and rinsing process, a water contact angle of less than approximately 10 degrees was observed for all glass sheets. A water contact angle of less than approximately 10 degrees indicates a main surface of the glass sheet where hydrophilicity is acceptable.

[0035] Example 2: Interleaving paper was placed between adjacent Corning and Eagle XG glass sheets (20 sheets in total, each with a main surface area of ​​approximately 4 inches x 4 inches (approximately 10 cm x 10 cm)) and vibrated using the Telecordia Standard (GR63, Transportation Vibration, Section 4.4.5) in a vibration procedure for the interleaving paper. Next, the glass sheets and interleaving paper were separated, and the glass sheets were then washed at approximately 70°C under ultrasound with an aqueous solution containing approximately 4% Semiclean KG for approximately 12 minutes, and then rinsed at approximately 70°C under ultrasound with deionized water for 12 minutes. This procedure was performed for four types of interleaving paper (two experiments were performed for each type of interleaving paper), specifically, paper 1, paper 3, paper 4, and paper 5, as previously described in Table 1. In addition, the vibration procedure was performed for each type of interleaving paper at approximately 20°C and relative humidity of approximately 20%, 50%, and 80%. After each experiment, a Toray Engineering Model HS830 particle counter was used to count particles with a diameter greater than approximately 0.3 micrometers on the main surface of each glass sheet before and after the washing and rinsing process. The results are shown in Figure 6. As can be seen from Figure 6, on each main surface of the glass sheet, after washing, there were fewer than approximately 30 particles per square centimeter with a diameter greater than approximately 0.3 micrometers.

[0036] Example 3: A flow potential procedure was performed on interpapers by placing them on a clean Corning Eagle XG glass sheet (with a main surface area of ​​approximately 2 inches x 2 inches (approximately 5 cm x 5 cm)) at approximately 24 hours under relative humidity of approximately 54% and a temperature of approximately 20°C. This procedure was performed for four types of interpapers, specifically Paper 1, Paper 3, Paper 4, and Paper 5, as previously described in Table 1. Next, the glass sheet and interpapers were separated, and the zeta potential of the glass surface was analyzed using the Anton Paar SurPass system for electrodynamic analysis. The results are shown in Figure 7. This system measures the zeta potential of the glass surface as a function of pH using the flow potential method and the charged current method. As can be seen from Figure 7, each main surface of the glass sheet has a zeta potential at approximately pH 3 ranging from approximately -40mV to approximately -80mV, a zeta potential at approximately pH 7 ranging from approximately -70mV to approximately -110mV, and a zeta potential at approximately pH 11 ranging from approximately -80mV to approximately -120mV, and is indistinguishable from the control. Such zeta potentials represent an acceptable level of electrostatic repulsion between the glass sheet and the interpaper.

[0037] Example 4: A spraying procedure for interpaper was performed over a period of approximately 24 to 48 hours at approximately 54% relative humidity and approximately 20°C, with a paper having a main surface area of ​​approximately 4 inches x 4 inches (approximately 10 cm x 10 cm) and a hole with a diameter of approximately 0.25 inches (approximately 6.3 mm) placed on a Corning Eagle XG glass sheet (with a main surface area of ​​approximately 4 inches x 4 inches (approximately 10 cm x 10 cm)). Next, the glass sheet was separated from the paper and exposed to vapor spray for a short period. Then, the glass sheet was washed at approximately 50°C with an aqueous solution containing approximately 1% Semiclean KG for approximately 1 minute, followed by rinsing in deionized water for approximately 1 minute, and this was repeated twice. After this process, the glass sheet was further exposed to vapor spray for a short period. This procedure was performed on two types of interpaper, specifically Paper 1 and Paper 3, as previously described in Table 1. In the case of interlayer paper 3, the main surface of the glass sheet showed visible uneven defects after exposure to the first vapor jet, but these visible defects were absent for both interlayer paper 1 and paper 3 after exposure to the second vapor jet.

[0038] Example 5: Each of the interleaved papers (Paper 1, Paper 3, Paper 4, Paper 5, and Paper 6, each with a main surface area of ​​approximately 1 inch × 1 inch (approximately 2.5 cm × 2.5 cm)) was analyzed using time-of-flight secondary ion mass spectrometry (TOF-SIMS). The results for normalized magnesium and aluminum ion intensities are shown in Figures 8A and 8B, respectively. Specifically, an IONTOF ToF-SIMS NCS with an M6 analyzer was used (ion beam characteristics: Bi3+, mass spectrometry mode, 400 micrometer beam-diffusing aperture, 200 micrometer × 200 micrometer random raster area at 128 × 128 pixel density, 350 microsecond cycle time, and approximately 0.7–0.8 pA pulsed current). A low-energy flood gun was used for charge compensation during the analysis. The analysis time was approximately 3 minutes, including 31 beam scans and approximately 1.94 × 10⁶ per square centimeter. 11The total ion dose of all ions was included. The peak area was normalized by the sum of all detected ions. Four analyses were performed per sheet (positive mode), and the plots shown are averaged from the four analyses, with error bars representing the standard deviation. As can be seen from Figures 8A and 8B, each principal surface of sheets 3 through 6 had a normalized magnesium ion intensity of less than approximately 2 and a normalized aluminum ion intensity of less than approximately 2. Magnesium and aluminum represent the presence of talc and aluminum silicate.

[0039] In a particular exemplary embodiment, after a two-month aging degradation procedure and cleaning of the interlayer, the main surface of the glass sheet has a water contact angle of less than 10 degrees, including less than 8 degrees, less than 6 degrees, and less than 4 degrees, such as less than 8 degrees, less than 10 degrees, less than 2 degrees, less than 8 degrees, and less than 3 degrees, less than 6 degrees, and less than 4 degrees.

[0040] In a particular exemplary embodiment, after a vibrating procedure relating to the interpaper, the main surface of the glass sheet has fewer than 30 particles, including about 5 to about 30 particles, more than 10 to about 25 particles, more than 20 particles, and more than 15 particles, with a diameter greater than about 0.3 micrometers per square centimeter after washing.

[0041] In a particular exemplary embodiment, after analysis of the flow potential of the glass sheet before and after contact with the interpaper, the main surface of the glass sheet has zeta potentials at pH 3 ranging from approximately -40mV to approximately -80mV, such as approximately -45mV to approximately -75mV; zeta potentials at pH 7 ranging from approximately -70mV to approximately -110mV, such as approximately -75mV to approximately -105mV; and zeta potentials at pH 11 ranging from approximately -80mV to approximately -120mV, such as approximately -85mV to approximately -115mV.

[0042] In a particular exemplary embodiment, after the spraying procedure relating to the interlayer, the main surface of the glass sheet does not exhibit any visible unevenness defects.

[0043] In a particular exemplary embodiment, the main surface of the interpaper has normalized magnesium ion intensity less than 2, such as less than 1.5, including about 0.5 to about 2, and further about 1 to about 1.5, as determined by time-of-flight secondary ion mass spectrometry (TOF-SIMS), and normalized aluminum ion intensity less than 2, such as less than 1.5, including about 0.5 to about 2, and further about 1 to about 1.5.

[0044] Embodiments disclosed herein can enable cost-effective packaging and transport of glass sheets, such as glass sheets used in display applications, having a main surface that is hydrophilic, has a reduced particle density of less than 1 micrometer, has an acceptable flow potential, is free from visible uneven defects, and has reduced talc contamination.

[0045] It will be apparent to those skilled in the art that various modifications and alterations can be made to embodiments of this disclosure without departing from the spirit and scope of this disclosure. Therefore, this disclosure is intended to include such modifications and alterations, provided that they fall within the scope of the accompanying claims and their equivalents.

[0046] Preferred embodiments of the present invention are described below in separate sections.

[0047] Embodiment 1 In the method of packaging glass sheets, A process of positioning two or more glass sheets inside a packaging device, and A step of placing interleaving paper between adjacent glass sheets of the two or more glass sheets, Includes, The interleaving paper has a total lignin content of at least about 5 mass percent, in a method.

[0048] Embodiment 2 The method according to Embodiment 1, wherein the interlayer paper has a total lignin content of about 5% by mass to about 40% by mass.

[0049] Embodiment 3 The method according to Embodiment 1, wherein the interlayer paper has a total polysaccharide content of about 80 percent by mass or less.

[0050] Embodiment 4 The method according to Embodiment 3, wherein the interlayer paper has a total polysaccharide content of about 40% by mass to about 80% by mass.

[0051] Embodiment 5 The method according to Embodiment 1, wherein, after a two-month period of deterioration and cleaning of the interlayer paper, the main surface of any one of the two or more glass sheets has a water contact angle of less than approximately 10 degrees.

[0052] Embodiment 6 The method according to Embodiment 1, wherein, after the vibration and cleaning procedure for the interlayer paper, the number of particles having a diameter greater than about 0.3 micrometers per square centimeter on the main surface of any one of the two or more glass sheets is less than about 30.

[0053] Embodiment 7 The method according to Embodiment 1, wherein, after the flow potential procedure for the interpaper, the main surface of any one of the two or more glass sheets has a zeta potential at pH 3 ranging from approximately -40 mV to approximately -80 mV, a zeta potential at pH 7 ranging from approximately -70 mV to approximately -110 mV, and a zeta potential at pH 11 ranging from approximately -80 mV to approximately -120 mV.

[0054] Embodiment 8 The method according to Embodiment 1, wherein, after the spraying procedure with respect to the interlayer paper, the main surface of any one of the two or more glass sheets does not show any visible unevenness or defects after cleaning.

[0055] Embodiment 9 The method according to Embodiment 1, wherein the main surface of the interpaper has a normalized magnesium ion intensity of less than about 2 and a normalized aluminum ion intensity of less than about 2, as determined by time-of-flight secondary ion mass spectrometry (TOF-SIMS).

[0056] Embodiment 10 In packaging equipment, Two or more glass sheets are positioned within it, A paper interleaving sheet placed between adjacent glass sheets of the two or more glass sheets, Includes, The interleaving paper has a total lignin content of at least about 5 mass percent in the packaging device.

[0057] Embodiment 11 The packaging apparatus according to Embodiment 10, wherein the interleaving paper has a total lignin content of about 5 mass percent to about 40 mass percent.

[0058] Embodiment 12 The packaging apparatus according to Embodiment 10, wherein the interleaving paper has a total polysaccharide content of approximately 80 percent by mass or less.

[0059] Embodiment 13 The packaging apparatus according to Embodiment 12, wherein the interleaving paper has a total polysaccharide content of about 40 mass percent to about 80 mass percent.

[0060] Embodiment 14 The packaging apparatus according to Embodiment 10, wherein, after a two-month period of deterioration and cleaning of the interleaving paper, the main surface of any one of the two or more glass sheets has a water contact angle of less than approximately 10 degrees.

[0061] Embodiment 15 The packaging apparatus according to Embodiment 10, wherein, after the vibration and cleaning procedure for the interlayer paper, the number of particles having a diameter greater than about 0.3 micrometers per square centimeter on the main surface of any one of the two or more glass sheets is less than about 30.

[0062] Embodiment 16 The packaging apparatus according to Embodiment 10, wherein, after the flow potential procedure for the interpaper, the main surface of any one of the two or more glass sheets has a zeta potential at pH 3 ranging from approximately -40 mV to approximately -80 mV, a zeta potential at pH 7 ranging from approximately -70 mV to approximately -110 mV, and a zeta potential at pH 11 ranging from approximately -80 mV to approximately -120 mV.

[0063] Embodiment 17 The packaging apparatus according to Embodiment 10, wherein, after the spraying procedure for the interlayer paper, the main surface of any one of the two or more glass sheets does not show any visible unevenness or defects after washing.

[0064] Embodiment 18 The packaging apparatus according to Embodiment 10, wherein the main surface of the interpaper has a normalized magnesium ion strength of less than approximately 2 and a normalized aluminum ion strength of less than approximately 2, as determined by time-of-flight secondary ion mass spectrometry (TOF-SIMS). [Explanation of Symbols]

[0065] 10 Glass film 12 First main surface of the glass sheet 14. Second main surface of the glass sheet 16. Edge surface of glass sheet 20-panel paper 22 The first main surface of the interleaving paper 24 The second main surface of the paper 100 Packaging device 102 Cover 104 Support member 106 units 108 Palettes 110 Post 112 Cushioning material

Claims

1. In the method of packaging glass sheets, A process of positioning two or more glass sheets inside a packaging device, and The process of placing interleaving paper between adjacent glass sheets of the two or more glass sheets, Includes, The interleaving paper has a total lignin content of 30 to 40 percent by mass.

2. The method according to claim 1, wherein the interlayer paper has a total polysaccharide content of 80 percent by mass or less.

3. The method according to claim 1, wherein, after a two-month period of deterioration and cleaning of the interlayer paper, the main surface of any one of the two or more glass sheets has a water contact angle of less than 10 degrees.

4. The method according to claim 1, wherein, after the vibration and cleaning procedure for the interlayer paper, the number of particles having a diameter greater than 0.3 micrometers per square centimeter on the main surface of any one of the two or more glass sheets is less than 30.

5. The method according to claim 1, wherein, after the flow potential procedure with respect to the interpaper, the main surface of any one of the two or more glass sheets has a zeta potential at pH 3 ranging from -40 mV to -80 mV, a zeta potential at pH 7 ranging from -70 mV to -110 mV, and a zeta potential at pH 11 ranging from -80 mV to -120 mV.

6. The method according to claim 1, wherein the main surface of the interpaper has a normalized magnesium ion intensity of less than 2 and a normalized aluminum ion intensity of less than 2, as determined by time-of-flight secondary ion mass spectrometry (TOF-SIMS).

7. In packaging equipment, Two or more glass sheets are positioned within it, A paper interleaving sheet placed between adjacent glass sheets of the two or more glass sheets, Includes, The aforementioned interleaving paper has a total lignin content of 30 to 40 percent by mass, in the packaging device.

8. The packaging apparatus according to claim 7, wherein the interleaving paper has a total polysaccharide content of 80 percent by mass or less.

9. The packaging apparatus according to claim 7, wherein, after a two-month period of deterioration and cleaning of the interleaving paper, the main surface of any one of the two or more glass sheets has a water contact angle of less than 10 degrees.

10. The packaging apparatus according to claim 7, wherein, after the vibration and cleaning procedure for the interlayer paper, the number of particles having a diameter greater than 0.3 micrometers per square centimeter on the main surface of any one of the two or more glass sheets is less than 30.

11. The packaging apparatus according to claim 7, wherein, after the flow potential procedure for the interpaper, the main surface of any one of the two or more glass sheets has a zeta potential at pH 3 ranging from -40 mV to -80 mV, a zeta potential at pH 7 ranging from -70 mV to -110 mV, and a zeta potential at pH 11 ranging from -80 mV to -120 mV.

12. The packaging apparatus according to claim 7, wherein the main surface of the interpaper has a normalized magnesium ion strength of less than 2 and a normalized aluminum ion strength of less than 2, as determined by time-of-flight secondary ion mass spectrometry (TOF-SIMS).

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