JP4224381B2 - Glass-like board slip - Google Patents

Abstract

Inserting paper for clean glass-like sheet materials reducing transport and storage costs without relying on packaging spacers, preventing paper marks, and providing electrostatic adhesion, comprised of a nonwoven sheet made from regenerated cellulose obtained by the viscose process, cuprammonium process, or other cellulose regenerating process, in particular one suppressed in content of hot water solubles (heat water soluble ingredients) to less than 0.1 wt% per unit nonwoven sheet, wherein the nonwoven sheet is formed so that the regenerated cellulose fibers are fused through fused parts without use of a binder and the surface of the nonwoven sheet is treated for dust prevention by for example pressing by a flat roller, suction by a suction system, etc. The obtained nonwoven sheet may be supercalendered. <IMAGE>

Description

  The present invention relates to an interleaving paper sandwiched between glass-like plate materials during transportation and storage of the glass-like plate material, and more particularly, to an interleaving paper that reduces contamination of the glass surface due to the interleaf paper itself and suppresses dust generation.

  Usually, when transporting or storing a glass plate such as a glass plate, a slip sheet is sandwiched between the glass plates to facilitate handling. In conventional interleaving papers, especially interleaving papers recycled from old paper, moisture on the glass surface (moisture in the air) reacts with alkali components in the glass during transport and storage, causing burns due to glass erosion. It was. In addition, the ink contained in the used paper and the resin component derived from the used paper raw material itself are transferred to the glassy plate material, causing a stain called a paper mark (paper mark) on the surface of the glassy plate material.

  In order to prevent the occurrence of burns and paper marks seen when using conventional slip sheets, slip sheets in which slit holes are dispersed (for example, see Patent Document 1), slip sheets in which zeolite is blended in the paper making process (for example, (See Patent Document 2), a slip sheet (for example, refer to Patent Document 3) coated with a water-soluble resin on the surface, and a slip sheet (for example, refer to Patent Document 4) in which a hot water soluble content is adjusted, has been developed. Improvements were repeated and used to improve various physical properties such as the contact area of the surface.

  However, the glass-like plate material used as a substrate of a flat panel display (FPD) represented by a liquid crystal display (LCD), a plasma display panel (PDP), an organic EL display, etc. is required to have a higher surface cleanliness. It has come to be. However, even if the above-mentioned various slip sheets are used, it is difficult to suppress the contamination of the glass surface to the required level. For this reason, at present, the “glass substrate” supplied to the display processor is not used for transportation or storage, but is only used for the “glass base plate” which becomes a glass substrate by coating a thin film.

Therefore, at the time of transportation and storage of the current glass substrate for display processors, a method of transporting and storing the glass-like plate material while holding it with a resin packaging auxiliary tool (spacer) (for example, see Patent Document 5) is widely used. ing. According to this method, adhesion between the glassy plate materials can be prevented, and it is effective against contamination of the surface of the glassy plate material. However, the space generated between the glass-like plate materials by the packaging auxiliary tool is wasted, and only a small number of glass-like plate materials can be transported and stored at a time, resulting in an increase in logistics and storage costs.
Japanese Patent Laid-Open No. 5-208841 JP 7-41034 A JP-A-9-170198 JP 2003-41498 A JP 2000-142873 A

  The present invention has been made in view of the above points, and reduces the transportation and storage costs without relying on packaging aids. In addition to preventing paper traces, a clean glassy plate material having electrostatic adhesion is provided. A slip is provided.

  That is, the invention of claim 1 is a nonwoven fabric comprising cellulose as a constituent material, and the content of the hot water soluble content in the nonwoven fabric is less than 0.1% by weight. Related to paper.

  The invention according to claim 2 relates to the slip sheet of the glassy plate material according to claim 1, wherein the nonwoven fabric is formed without using a binder.

  Invention of Claim 3 concerns on the slip sheet of the glass-like board | plate material of Claim 1 or 2 with which the press process by the flat roller is performed to the said nonwoven fabric.

  The invention according to claim 4 relates to the slip sheet of the glassy plate material according to any one of claims 1 to 3, wherein the non-woven fabric is subjected to a super calender treatment.

  The invention according to claim 5 is characterized in that the surface roughness of the nonwoven fabric is 1.5 μm or less as measured by a KES-FB-4S surface tester. Related to paper.

  According to the slip sheet of the glassy plate material according to the invention of claim 1, since it is a nonwoven fabric composed of cellulose, cellulose as found in slip sheets made from conventional pulp and slip sheets coated with a resin component No other components are contained. As a result, the content of the hot water soluble component can be made less than 0.1% by weight, which can be extremely effective in suppressing dirt (paper traces) generated on the glass surface during transportation and storage. .

  According to the slip sheet of the glassy plate material according to the invention of claim 2, since the binder is not used in the formation of the nonwoven fabric, the slip sheet is formed only from cellulose (regenerated cellulose) which is a constituent material. Thus, the transfer of impurities contained in the conventional interleaving paper to the glass surface can be eliminated. As a result, since a further effect can be exerted in suppressing dirt (paper traces) on the glass surface, the glassy plate material can be transported and stored in an extremely clean state.

  According to the slip sheet of the glassy plate material according to the invention of claim 3, since the pressing treatment by the flat roller is performed on the nonwoven fabric, it is possible to suppress dust generation when using the slip sheet made of the nonwoven fabric. It becomes possible.

  According to the slip sheet of the glassy plate material according to the invention of claim 4, since the super calender treatment is performed on the nonwoven fabric, it is possible to further suppress dust generation when using the slip sheet made of the nonwoven fabric. Become.

  In addition, since the smoothness of the nonwoven fabric surface is improved, the adhesion between the interleaf (nonwoven fabric) using static electricity and the glass-like plate material is improved, and there is convenience in the work of sandwiching the interleaf into the glass-like plate material. Improved.

  According to the slip sheet of the glassy plate material according to the invention of claim 5, since the surface roughness is 1.5 μm or less, good electrostatic adhesion with the glassy plate material can be obtained.

  The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a spun fiber according to an embodiment of the present invention, FIG. 2 is a partially enlarged view of a nonwoven fabric, and FIG. 3 is a schematic cross-sectional view showing an example of a suction device used for dustproof treatment.

  The slip sheet of the glassy plate material of the present invention is a nonwoven fabric containing cellulose as a constituent material, and in particular, the content of hot water soluble component (hot water soluble component) is suppressed to less than 0.1% by weight per unit nonwoven fabric. Further, in the slip sheet of the glassy plate material of the present invention, the constituent material made of cellulose is formed as a nonwoven fabric without using a binder (adhesive), and further, the surface of the nonwoven fabric is described in detail later. However, it is appropriately dustproof and super calendered.

  The cellulose in the present invention is cellulose (so-called regenerated cellulose) obtained by a known cellulose regeneration method such as viscose method or copper ammonia method from pulp adjusted by alkali dissolution or the like from cotton or wood chips. . The regenerated cellulose corresponds to fibrous rayon (viscose method) and cupra (copper ammonia method). Since the above-mentioned recycled cellulose such as rayon is used as a constituent material of the nonwoven fabric of the present invention, the content of the components is uniform, unlike the interleaving paper manufactured by recycling used paper or the so-called paper interleaving paper manufactured from wood pulp, etc. Is achieved.

  In the case of forming a slip sheet of glassy plate material as a woven fabric from the above-mentioned fiberized rayon or cupra, generally, in a loom, the lubricating oil must be appropriately soaked into the rayon and cupra fibers, and the final woven fabric product Impurities such as oil remain. Therefore, when the use for transportation of the glass substrate for flat panel displays (FPD) is assumed, contamination of the glass substrate surface by residual oil is a concern. Further, when a conventional woven fabric made of rayon and cupra fibers is used as a slip sheet for a glass-like plate material, it is necessary to separately remove oil from the woven fabric itself, which complicates the work process and inevitably increases costs. Therefore, it is preferable that the slip sheet of the glassy plate material is a non-woven fabric with cellulose as a constituent material as defined in claim 1.

  In processing into a nonwoven fabric, there is a method of adding various known binders to fibrous cellulose. However, for the purpose of suppressing the contamination of the glassy plate material surface, which is the object of the present invention, as much as possible, the nonwoven fabric should be formed without using a binder as defined in claim 2. Examples of the production method that does not use a binder include a pre-spun rayon, a needle punch method in which fibers are entangled while pulling fibers with a tension needle, but a lubricating oil must be appropriately attached to the tension needle. Therefore, it is not preferable for the same reason as the use of the loom.

  From the above viewpoint, as a production method that does not use a binder, a production method such as a spunlace method in which fibers such as pre-manufactured rayon and cupra are entangled between adjacent fibers by high-pressure water flow is used, and the regenerated cellulose is used as a constituent material. A non-woven fabric is produced. In addition, in the case of rayon, the fiber stock solution (viscose) is spun, the constituent fibers are fixed to each other by thermocompression bonding, and the nonwoven fabric production is continuously performed. Examples of the production method include continuous bonding from hydrogen bonding using surface water swellability of (Blau Faden (blue yarn)) and nonwoven fabric production by entanglement by high-pressure water flow.

  The hot water-soluble component in the claims is the ratio of the total weight of the components eluted in the hot water from the nonwoven fabric of the present invention to the nonwoven fabric. As described in the background art above, when transporting and storing a glass-like plate material, moisture in the air is absorbed by the slip sheet, so that contamination of the glass surface has been regarded as a problem due to elution of components in the slip sheet. Therefore, the hot water soluble component (hot water soluble component) was defined as an index for testing the elution of the components in the slip sheet.

  The hot water-soluble component in the present invention will be described in detail in Examples below, but “TAPPI T207 om-81, water-soluble component of wood and pulp, 6.2” prepared by the American Paper and Pulp Technology Association (TAPPI). , Measured in accordance with “hot water soluble content”. As described in Japanese Patent Application Laid-Open No. 2003-41498 disclosed in the background art, the hot water-soluble component is less than 0.1% by weight in the slip sheet of the glass-like plate material made from a conventional method of making used paper. This is extremely difficult. On the other hand, as will be apparent from the examples described later, the present invention uses cellulose as a constituent material and contains almost no other impurities, so the hot water soluble content may be less than 0.1% by weight. It is said that it is effective in preventing paper marks on the surface of a glass-like plate material (in particular, a glass substrate).

  A non-woven fabric produced based on the viscose method in obtaining a non-woven fabric composed of the regenerated cellulose will be described.

Cotton, fiber derived from a pulp such as an alkali under the (cellulose), is reacted with carbon disulfide, by then made adjusted to viscose, which spun in the spinning bath containing a methylol agent such as formaldehyde, FIG A spinning fiber 10 having three layers of cellulose 11, hydroxymethylcellulose xanthate (hereinafter referred to as HMCX) 12, and sodium cellulose xanthate (hereinafter referred to as NaCX) 13 shown in the sectional view of 1 is obtained. .

  The general chemical structure of the three components of the spun fiber 10 is shown in Table 1 below.

  The spun fiber 10 composed of the three layers is appropriately cut, dispersed and made into a sheet, and the HMCX is thermally fluidized by thermocompression when embossing is performed using an embossing roller in the presence of moisture. And welded to the surrounding spun fibers. When the heating further proceeds, HMCX is thermally decomposed and converted into cellulose, and the fused portion 21 shown in the partially enlarged view of FIG. 2 is formed and solidified. Thereafter, shrinkage is appropriately performed under dilute acid such as temperature and pH, and the above HMCX and NaCX are converted into cellulose. Subsequently, by passing through bleaching, washing with water, drying, and the like, the nonwoven fabric 20 formed without using a binder with cellulose as a constituent material is obtained. The code | symbol 22 is the regenerated cellulose which the inside was converted into the cellulose.

  As described above, since the slip sheet of the glassy plate material of the present invention includes a cellulose derivative in the production process, it is finally converted into cellulose, so that cellulose can be said to be a constituent material.

  As defined in claim 3, it is desirable that a pressing process with a flat roller is further performed during the molding of the nonwoven fabric, particularly during the embossing. When a flat roller is used in this way, the spun fibers that have been thermocompression bonded by embossing are further smoothed by being pressed by the flat roller, and at the same time, the fluff of the spun fibers having a short fiber length is suppressed. Therefore, the pressing process using a flat roller effectively acts as a dustproof process. In addition, the shape and size of the emboss, the pressing amount by the flat roller, and the like are appropriately set.

  In addition, the non-woven fabric obtained by completely converting the internal components of the spun fiber into cellulose and undergoing bleaching, washing with water, drying, and the like, is wound up after drying, for example, in the schematic cross-sectional view of FIG. By using the suction device 30 as shown, a dustproof treatment for sucking fuzz on the surface of the nonwoven fabric may be performed. The suction device 30 blows air on the surface of the nonwoven fabric 20 transferred by the transfer roller 45 while vibrating the surface of the nonwoven fabric in combination with the ultrasonic waves irradiated from the ultrasonic generator 33 by the air injected from the pressurizing unit 32. As a result, the dust generation factor of the nonwoven fabric 20 is floated, sucked into the suction portion 31 and exhausted to the outside through the exhaust port 35. FIG. 3 shows an example in which the dust generation factor is sucked from one side of the nonwoven fabric 20, but it is desirable to suck the dust generation factor from both sides of the nonwoven fabric. Reference numeral 34 denotes a suction port, and 40 denotes a static electricity removing unit.

  As a usage mode of the slip sheet generally used for the glass-like plate material, for example, as disclosed in JP-A-49-13865, at least one of the slip sheet and the glass-like plate material is charged with a predetermined voltage. In many cases, the generated static electricity is used to overlap the two. In other words, it is intended to improve the convenience in the work of sandwiching the slip sheet between the glass sheet and the slip sheet by using static electricity.

  However, the surface shape of the nonwoven fabric is rough even when compared with conventional slip sheets. For this reason, the contact area between the glass-like plate material and the nonwoven fabric is smaller than that of conventional slip sheets, and it cannot be said that the effect of improving the adhesion due to electrostatic charging is sufficiently obtained. Therefore, it can be said that it is desirable to improve the smoothness of the nonwoven fabric as much as possible with respect to the adhesion between the nonwoven fabric and the glass-like plate material when static electricity is charged.

  Therefore, in order to improve the smoothness of the surface of the non-woven fabric formed as described above and subjected to dust-proofing treatment as needed, supercalendering is performed as defined in claim 4. The supercalender treatment (also referred to as supercalender treatment) is usually a nonwoven fabric according to the present invention in which metal rolls and non-metallic elastic rolls are alternately stacked in multiple layers of 5 to 20 layers. , And a pressure of 1900 to 2600 N / cm (maximum of about 3500 N / cm) at a linear pressure. By this super calendering treatment, the nonwoven fabric is subjected to high pressure to reduce its thickness, and at the same time, the dust-proof property of the nonwoven fabric surface is enhanced, and smoothness is also increased. In addition, processing conditions such as pressure (linear pressure), temperature, moisture content of the nonwoven fabric, and pressurization time in the super calendering process are appropriately set.

  Here, the smoothness of the nonwoven fabric of the present invention is positioned as the surface roughness of the nonwoven fabric (glass paper sheet) as defined in claim 5. The surface roughness is quantified in measurement using a KES-FB-4S surface tester manufactured by Kato Tech Co., Ltd., and is preferably regulated to 1.5 μm or less, and further to 1.2 μm or less. As will be apparent from the examples described later, a sample that has been subjected to a super calender treatment in order to improve smoothness has a better result in electrostatic adhesion. Considering the above, the relationship between surface roughness and electrostatic adhesion is inferred, and suppression of surface roughness is an index for improving electrostatic adhesion.

  As described above, the glass-like plate material in the present invention has been described in detail, but in the production of the paper, embossing using an embossing roller is omitted in welding the spun fibers, and a flat roller In some cases, only the pressing process is performed. In addition, in the production of interleaf made of nonwoven fabric, the pressing process using a flat roller and the super calendering process are appropriately incorporated in the process in consideration of the manufacturing equipment, production cost, etc., and are not necessarily limited to the above processes. Is not to be done.

  As described above, the inventors have prepared a non-woven fabric produced from the viscose method as described in detail above using a non-woven fabric formed without using a binder composed of cellulose as the glass sheet material of the present invention (Nikamura Chemical). Kogyo Co., Ltd .: Taiko TCF) was prepared as a slip sheet for the glassy plate material of the example. The nonwoven fabric of the above example was pressed by a flat roller during embossing as a dustproof treatment.

  Further, an interleaving paper actually used as an interleaving paper for a glass base plate for a flat panel display substrate was compared with the interleaving paper of the example as a comparative example. For the interleaving paper of the comparative example, interleaving paper made of acid paper made from ordinary pulp (manufactured by N company: NPD) is used as comparative example 1, and interleaving paper made of neutral paper (manufactured by N company: NDP) Was used as Comparative Example 2, and a slip sheet (manufactured by T company: ATP) regenerated from waste paper was used.

[Measurement of soluble in hot water]
The interleaving papers of Examples and Comparative Examples 1 to 3 were evaluated according to the above-mentioned “TAPPI T207 om-81, water-soluble content of wood and pulp, 6.2, hot water-soluble content”. Specifically, from the interleaving papers of Examples and Comparative Examples 1 to 3, 5 g of each was taken as a sample, 250 g of distilled water was added to each, and boiling was continued for 30 minutes. The extract was filtered off, and 250 g of distilled water was added again, and boiling was continued for 30 minutes. This operation was performed 3 times, and the extract for 3 times was collected.

  The extract was concentrated and dried in an evaporating dish and then weighed, and the weight ratio of the dried product to each sample was determined as the hot water soluble content (% by weight). The results are shown in Table 2.

  As can be understood from the results in Table 2 above, the slip sheet of the glassy plate material of the example does not use a binder when making pulp, for example, compared to the slip sheet of Comparative Examples 1 to 3. It is presumed that the amount of hot water soluble component is obviously small and effective in preventing paper marks on the glass surface.

[Evaluation of influence on glass surface]
The interleaving papers of Examples and Comparative Examples 1 to 3 cut into strips were arranged in parallel, and the interleaving papers were sandwiched between two TFT-LCD module plate glasses. Further, the glass was sandwiched between styrene foams so that pressure was applied uniformly and fixed with a rubber band. Such an integrated product of plate glass and interleaf paper was exposed at a temperature of 60 ° C. and a relative humidity of 95% for a maximum of 318 hours.

  After applying water vapor to the surface of the plate glass and becoming cloudy with respect to the integrated product of the plate glass and the slip sheet, a uniform pore pressure is applied to the contact surface of each slip sheet using a microporous urethane sponge. Scraped strongly. After the surface of the plate glass was dried, water vapor was applied again, and the degree of peeling of the paper mark (paper mark) on the interleaf contact surface was visually evaluated in four stages. In the same evaluation, the interleaf paper on the interleaf contact surface that was wiped off better than the degree of removal of paper marks was evaluated as “1”, and the interleaf paper on the interleaf contact surface that could not be wiped off was evaluated as “4”. The evaluation values for each elapsed time were totaled and a four-level comprehensive evaluation was performed. In addition, in order to correctly evaluate the paper trace, it was confirmed that there was no burn in the exposed portion of the plate glass to which the interleaf paper was not adhered. Table 3 below shows the exposure time and contamination of the plate glass surface.

  As can be understood from the results of Table 3 above, it can be said that the interleaving paper of the example shows good properties and the quality is stable as compared with the interleaving paper of any comparative example.

  Based on these results, there is a clear relationship between the amount of the hot water soluble matter and the contamination of the surface of the glass sheet. In particular, the interleaf paper of the embodiment of the present invention, that is, the binder comprising cellulose as a constituent material. It is suggested that the nonwoven fabric formed without using is particularly suitable as a slip sheet for glass-like plate materials during transportation and storage of glass substrates that require high cleanliness.

[Preparation of non-woven fabric]
The inventors who have been convinced of the suitability of the nonwoven fabric based on the above knowledge are nonwoven fabrics having different basis weights (g / m ² ) and surface roughness (μm) obtained from the viscose method as described above in detail (Nimura) 3 types manufactured by Chemical Industry Co., Ltd .: Dazai TCF series) were produced. The three types of nonwoven fabrics were identified as Sample 1-1, Sample 1-2, and Sample 1-3 in the following examples. Note that only the nonwoven fabric of Sample 1-3 was pressed by a flat roller during embossing.

  Moreover, in order to control the smoothness of the nonwoven fabric surface, the inventors performed supercalender treatment on the nonwoven fabrics of Sample 1-1, Sample 1-2, and Sample 1-3, respectively. In the following examples, the non-woven fabric obtained by subjecting the sample 1-1 to the super calender treatment is designated as sample 2-1, and the non-woven fabric obtained by subjecting the sample 1-2 to the same treatment is designated as sample 2-2 and sample 1-3. The nonwoven fabric subjected to the same treatment was identified as Sample 2-3. The conditions for the super calendar process are 14 steps, 13 nips, linear pressure: 1960 N / cm, temperature: 80 ° C., and processing speed: 60 m / min.

[Measurement of surface roughness]
About the nonwoven fabric of each said sample, the surface roughness was measured using the KES-FB-4S surface testing machine by Kato Tech, respectively. The measurement conditions are: static load: 98 mN, tension: 196 mN / cm, contact length: 5 mm, pulling speed: 0.1 cm / sec, pulling distance: 2 cm. When measuring each sample, the vertical and horizontal directions were measured five times, the average value in the vertical direction and the average value in the horizontal direction were calculated, and the larger one was the surface roughness of the sample.

[Measurement of electrostatic adhesion]
In a room maintained at a room temperature of 20 ° C. and a relative humidity of 65%, the nonwoven fabric of each of the above samples cut into the A4 plate is superimposed on the TFT-LCD module plate glass cut into an A4 plate (about 210 mm × 297 mm). It was. From these non-woven fabrics, using an electrostatic charging device (electrostatic fine material collector JPK-3: manufactured by Kasuga Denki Co., Ltd.), -20 kV static electricity was applied for charging. In this case, the entire surface of the nonwoven fabric was charged while the charging electrode port of the electrostatic charging device was kept at a position of 5 cm immediately above the nonwoven fabric of each sample.

  The monolithic product of the sufficiently charged sheet glass and the nonwoven fabric of each sample was completely turned upside down, and the time until the nonwoven fabric of the sample completely peeled off the sheet glass was measured. However, the time measurement was up to 20 seconds.

  Regarding the nonwoven fabric of Sample 1-1, Sample 1-2, Sample 1-3, Sample 2-1, Sample 2-2, and Sample 2-3 and Comparative Example 2 (neutral paper) described above, their physical properties and Table 4 shows the measurement results.

  As can be seen from Table 4, the sample 2-1, the sample 2-2, and the sample 2-3 that have been subjected to the supercalender treatment compared to the sample 1-1, the sample 1-2, and the sample 1-3 In both cases, the numerical value of surface roughness decreased. In connection with this, it turns out that the electrostatic adhesiveness (duration duration) of a sample is also improved significantly. Therefore, it can be said that the smoothness of the nonwoven fabric surface is effective in improving electrostatic adhesion. Moreover, the comparison with Sample 2-1, Sample 2-2, Sample 2-3 and Comparative Example 2 showed the same electrostatic adhesion as the conventional slip sheet (Comparative Example 2: neutral paper). Therefore, the inventors use a non-woven fabric that has been subjected to a super calender treatment, thereby allowing close contact with a glass-like plate material using static electricity, and improving convenience in the work of sandwiching a slip sheet between the glass-like plate materials. Confirmed.

[Measurement of dust generation]
A simple hood made of a vinyl chloride resin that can be opened only on one side of the side surfaces of 700 mm in length, 500 mm in width, and 500 mm in depth was assembled in a clean room of class 10000. A hole was made in the center of the ceiling of the simple hood, and the air and particulate counter (The Portable: manufactured by HIAC / ROICO) was placed so that the suction port hanged about 10 cm in the simple hood.

  Each of the nonwoven fabrics of Sample 1-1, Sample 1-2, Sample 1-3, Sample 2-1, Sample 2-2, and Sample 2-3 previously cut into A4 plates (about 210 mm × 297 mm) The creases were made so that the size was 1/8. Subsequently, the simple hood is opened about 100 mm, and the non-woven fabric of each material creased at the central portion of the simple hood is used with sewing scissors so that the speed becomes 5 seconds per time. One sample was cut a total of 8 times.

  Of the particles (dust) scattered from the sample into the clean room by the above-described cutting, particularly particles of 0.3 μm or more were measured by the above-mentioned air / fine particle counter. The measurement results are shown in Table 5. The number of particles measured was obtained as the number per unit cubic foot, and the converted number per unit cubic meter was attached for reference.

  As can be seen from Table 5, Samples 2-1 2-2, and 2-3, which were subjected to supercalendering compared to Sample 1-1, Sample 1-2, and Sample 1-3, In both cases, the number of measured particles was reduced by almost half. Therefore, it can be seen that the super calendar process is also effective as a dust-proofing process for the nonwoven fabric.

  As a result, the use of interleaving paper, which was previously used for the “glass base plate” that becomes a glass substrate by coating a thin film, can be used for transportation and storage of the “glass substrate” supplied to display processors. Can be enlarged. Therefore, even when transporting or storing a glass substrate or the like, an improvement in the flow rate and storage amount per time is expected without depending on a packaging auxiliary tool (spacer).

It is sectional drawing of the spinning fiber which concerns on one Example of this invention. It is the elements on larger scale of the nonwoven fabric which concerns on one Example of this invention. It is a schematic sectional drawing which shows an example of the suction device used for a dustproof process.

Explanation of symbols

10 Spinning fiber 11 Cellulose 12 HMCX
13 NaCX
DESCRIPTION OF SYMBOLS 20 Nonwoven fabric 21 Fusion part 22 Regenerated cellulose 30 Suction apparatus 31 Suction part 32 Pressurization part 33 Ultrasonic wave generation part

Claims (5)

  A slip sheet of glassy plate material, which is a nonwoven fabric comprising cellulose as a constituent material, wherein the content of the hot water-soluble component in the nonwoven fabric is less than 0.1% by weight.   The slip sheet of the glass-like board | plate material of Claim 1 in which the said nonwoven fabric is formed without using a binder.   The slip sheet of the glass-like board | plate material of Claim 1 or 2 with which the press process by the flat roller is performed to the said nonwoven fabric.   The slip sheet of the glass-like board | plate material of any one of Claim 1 thru | or 3 with which the super calendar process is performed to the said nonwoven fabric.   The slip sheet of the glassy board | plate material of any one of Claim 1 thru | or 4 whose surface roughness of the said nonwoven fabric is 1.5 micrometers or less in the measurement by a KES-FB-4S surface testing machine.

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