WO2018173572A1 - ガラス板用合紙 - Google Patents
ガラス板用合紙 Download PDFInfo
- Publication number
- WO2018173572A1 WO2018173572A1 PCT/JP2018/005392 JP2018005392W WO2018173572A1 WO 2018173572 A1 WO2018173572 A1 WO 2018173572A1 JP 2018005392 W JP2018005392 W JP 2018005392W WO 2018173572 A1 WO2018173572 A1 WO 2018173572A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- glass plate
- glass
- mass
- pulp
- interleaving paper
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G49/00—Conveying systems characterised by their application for specified purposes not otherwise provided for
- B65G49/05—Conveying systems characterised by their application for specified purposes not otherwise provided for for fragile or damageable materials or articles
- B65G49/06—Conveying systems characterised by their application for specified purposes not otherwise provided for for fragile or damageable materials or articles for fragile sheets, e.g. glass
- B65G49/068—Stacking or destacking devices; Means for preventing damage to stacked sheets, e.g. spaces
- B65G49/069—Means for avoiding damage to stacked plate glass, e.g. by interposing paper or powder spacers in the stack
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D57/00—Internal frames or supports for flexible articles, e.g. stiffeners; Separators for articles packaged in stacks or groups, e.g. for preventing adhesion of sticky articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D57/00—Internal frames or supports for flexible articles, e.g. stiffeners; Separators for articles packaged in stacks or groups, e.g. for preventing adhesion of sticky articles
- B65D57/002—Separators for articles packaged in stacks or groups, e.g. stacked or nested
- B65D57/003—Separators for articles packaged in stacks or groups, e.g. stacked or nested for horizontally placed articles, i.e. for stacked or nested articles
- B65D57/004—Separators for articles packaged in stacks or groups, e.g. stacked or nested for horizontally placed articles, i.e. for stacked or nested articles the articles being substantially flat panels, e.g. wooden planks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
- B65D85/30—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure
- B65D85/48—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure for glass sheets
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/02—Synthetic cellulose fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/12—Organo-metallic compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/65—Acid compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/18—Paper- or board-based structures for surface covering
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Definitions
- the present invention relates to a slip sheet inserted between glass plates.
- the present invention relates to a slip sheet for a glass plate used in a distribution process or a manufacturing process in which a plurality of glass substrates for flat panel displays such as liquid crystal displays, organic electroluminescence displays, and plasma displays are stacked and stored and transported.
- Such foreign substances and contaminants include organic water-insoluble substances derived from natural resins and gum substances released from wood, pulp and paper, and additives.
- resins such as an adhesive natural resin (pitch) derived from wood, a synthetic resin in an additive, and an organic polysiloxane compound typified by polydimethylsiloxane.
- Glass plates particularly glass substrates used for flat panel displays, undergo a step of washing the glass surface using a medium mainly composed of water before shipping or mounting of electronic components and the like.
- a medium mainly composed of water mainly composed of water
- adhesive resin glue
- foreign substances such as paper dust attached to the glass substrate surface are almost washed away by this process, adhesive resin (pitch), foreign substances, and substances having high affinity with glass adhere to the glass surface even after cleaning. There is a high possibility.
- a pitch control agent may be used in order to reduce the harmful effects of resin (pitch).
- the pitch control agent is a substance for preventing the resin (pitch) from adhering in the manufacturing process and papermaking process. Specifically, talc, sulfuric acid band (aluminum sulfate), surfactant, cationic polymer, etc. It has been known.
- Patent Document 1 reduces the ratio of talc present on the surface, and instead uses a surfactant, a cationic polymer, a sulfate band (aluminum sulfate), etc. as a non-talc pitch control agent. It is disclosed.
- the present invention has been made in view of the above situation. That is, the subject of this invention is providing the interleaving paper for glass plates which reduced that the aggregate mainly consisting of resin part adheres to a glass plate.
- the present inventors have proceeded with analysis of adhered foreign substances that have caused product defects due to poor formation of electronic members or the like.
- the adhering foreign matter has a size of several tens of ⁇ m or more, and was found to be an aggregate containing a resin component.
- aluminum ions were dissociated from aluminum sulfate added as a pitch control agent, anionic substances and the like were agglomerated due to the strong aggregating action of the aluminum ions, and the agglomerates became coarse and became adhered foreign matter. It has been found.
- the present invention was born based on such knowledge. That is, the present invention has the following configuration.
- a slip sheet for glass plate comprising cellulose pulp as a main component, an aluminum content of less than 0.2% by mass, and a basis weight of 10 to 100 g / m 2 .
- the slip sheet for glass plate of the present invention it is possible to reduce adhesion of aggregates mainly composed of resin to the glass plate.
- the interleaving paper for glass plate of this embodiment is mainly composed of cellulose pulp, the aluminum content is less than 0.2% by mass, and the basis weight is 10 to 100 g / m 2 .
- the adhered foreign matter is an aggregate in which the resin component is aggregated and has a size of several tens of ⁇ m or more. Furthermore, it was found that the adhered foreign matter contains aluminum.
- Aluminum is mainly derived from aluminum sulfate used as a papermaking chemical.
- Aluminum sulfate not only functions as a pitch control agent, but also has a function of fixing a sizing agent, a function of improving drainage, and a function of suppressing pulp koji from adhering to papermaking equipment. For this reason, aluminum sulfate is often added in order to stabilize the operability of the slip sheet manufacturing.
- the mechanism by which aluminum sulfate functions as a pitch control agent is as follows. Since the aluminum ions dissociated from the aluminum sulfate have a cationic property, the anionic resin or the like and the pulp fiber are combined and incorporated into the paper. As a result, the occurrence of harmful effects due to the resin or the like is suppressed.
- agglomerated aggregates are formed by agglomeration of resin (pitch) and the like, which is a so-called papermaking foreign matter. Such coarsened aggregates may cause product defects such as electronic members.
- the present inventors set the aluminum content to less than 0.2% by mass in order to prevent the agglomerates mainly composed of the resin from adhering to the interleaf paper for glass plates. I found that it was necessary.
- the aluminum content is preferably less than 0.01% by mass.
- the talc adsorbing the resin (pitch) may agglomerate, and the agglomerate may be wrought into a foreign material. Therefore, the upper limit of the talc content was also examined. As a result, it was found that the talc content is preferably less than 0.1% by mass. The talc content is more preferably less than 0.01% by mass.
- paper using aluminum sulfate as a papermaking chemical more than a certain amount becomes so-called acidic paper when the hot water extraction pH measured in accordance with JIS P8133 is about 4 to 5.5, for example.
- the slip sheet for glass plate of this embodiment has cellulose pulp as a main component.
- cellulose pulp various cellulose pulp can be used 1 type or in mixture of 2 or more types.
- the cellulose pulp include chemical pulps such as kraft pulp (KP), sulfite pulp (SP), and soda pulp (AP); semi-chemical pulps such as semichemical pulp (SCP) and Chemi-Grandwood pulp (CGP);
- SCP semichemical pulp
- CGP Chemi-Grandwood pulp
- mechanical pulps such as groundwood pulp (GP), thermomechanical pulp (TMP, BCTMP), refiner grandwood pulp (RGP); and non-wood fiber pulps made from straw, mitsu, hemp, kenaf and the like.
- wood pulp it may be a softwood pulp, a hardwood pulp, or a mixture thereof.
- wood pulp kraft pulp (KP) having a low content of an adhesive natural resin derived from wood is suitable.
- KP kraft pulp
- having cellulose pulp as a main component means that the cellulose pulp exceeds 50% by mass, preferably 70% by mass or more, more preferably 90% by mass or more, with respect to the mass of the slip sheet. .
- the beating degree of cellulose pulp is preferably 200 to 700 mlcsf.
- the beating degree is the Canadian standard freeness according to JIS P8121.
- the beating degree is more preferably 350 to 600 mlcsf.
- a known method can be used as a method of beating the pulp in order to adjust the beating degree to 200 to 700 mlcsf.
- Paper making chemicals Regarding the papermaking chemicals used for papermaking of the glass sheet interleaf, various known chemicals can be used within a range that does not contaminate the glass surface and damage the glass surface.
- papermaking chemicals include sizing agents such as rosin, styrene / maleic acid, alkenyl succinic anhydride, and alkyl ketene dimer, paper strength enhancers such as polyacrylamide, drainage retention improvers, and water resistance such as polyamide polyamine epichlorohydrin.
- Interleaf paper manufacturing method There is no restriction
- Specific examples of the paper machine include a long net former, a twin wire former, a circular net former, and an inclined former.
- the layer structure of the glass sheet interleaving paper may be a single layer or multiple layers.
- the basis weight of the interleaving paper is preferably large to some extent from the viewpoint of buffering properties.
- the basis weight of the slip sheet is 10 to 100 g / m 2 .
- the basis weight of the interleaving paper is preferably 35 to 80 g / m 2 .
- the thickness of the interleaving paper for glass plate is preferably 25 to 250 ⁇ m from the viewpoints of buffer properties and workability. Further, the density of the interleaf paper for glass plate is preferably 0.4 to 1.2 g / cm 3 .
- blending is a numerical value of the mass reference
- the aluminum content (mass%) in the slip sheet was obtained by a calibration curve prepared in advance using a slip sheet containing a predetermined amount of aluminum using an X-ray fluorescence analyzer (Spectris PW2404).
- ⁇ Talc content in interleaving paper> The glass interleaving paper was incinerated according to JIS P8251. Next, the talc content (% by mass) in the obtained ash was determined by using a fluorescent X-ray diffractometer (RINT-Ultima III, manufactured by Rigaku Corporation) and using a slip sheet containing a predetermined amount of talc. Obtained by line. The talc content m in the glass interleaving paper was determined by the following formula (1).
- m (b / a) ⁇ c ⁇ 100 (1)
- m talc content (% by mass)
- a Mass of glass interleaving paper
- b Mass of ash
- g Talc content in ash (% by mass)
- Glass plate surface contamination test A press operation was repeated by applying 310 mm ⁇ 310 mm glass sheet slip to a 300 mm ⁇ 300 mm glass sheet for flat panel display and applying pressure at 0.7 MPa for 10 seconds. That is, the same glass plate for a 300 mm ⁇ 300 mm flat panel display is used, and each time a 310 mm ⁇ 310 mm glass plate interleaf is pressed, it is changed to a new one, and the press operation is repeated 100 times. A glass plate for display was obtained.
- Paper is made with a long paper machine without adding aluminum sulfate or other papermaking chemicals to 100% pulp slurry (beating degree 450mlcsf) of commercial NBKP (conifer bleached kraft pulp) with a talc content of 0% by mass, dried and dried.
- a slip sheet for glass plate having an amount of 50 g / m 2 was obtained.
- Example 2 A glass sheet slip sheet was obtained in the same manner as in Example 1 except that a pulp slurry in which 1% by mass of aluminum sulfate hexahydrate was added to the mass of the absolutely dry pulp was used. The aluminum content of the obtained glass sheet slip sheet was 0.08% by mass.
- Example 3 A glass sheet interleaf was obtained in the same manner as in Example 1 except that a commercially available NBKP (softwood bleached kraft pulp) 100% pulp slurry having a talc content of 0.2% by mass was used. The obtained talc content of the interleaf paper for glass plate was 0.05% by mass.
- NBKP softwood bleached kraft pulp
- Example 1 A glass sheet slip sheet was obtained in the same manner as in Example 2 except that 4% by mass of aluminum sulfate 16 hydrate was added. The aluminum content of the obtained glass sheet slip sheet was 0.31% by mass.
- Example 2 A glass sheet interleaf was obtained in the same manner as in Example 1 except that a commercially available NBKP (softwood bleached kraft pulp) 100% pulp slurry having a talc content of 1% by mass was used. The obtained talc content of the interleaf paper for glass plate was 0.25% by mass.
- NBKP softwood bleached kraft pulp
- Table 1 shows the evaluation results of Examples 1 to 3 and Comparative Examples 1 to 3.
- the slip sheets for glass plates of Examples 1 to 3 were excellent in glass plate contamination. Moreover, compared with Example 3 containing talc, Example 1 and Example 2 which do not contain talc were further superior in glass plate contamination. On the other hand, the glass sheet slip sheets of Comparative Example 1 and Comparative Example 2 were inferior in glass plate contamination. The interleaving paper for glass plate of Comparative Example 3 was inferior in glass plate contamination and scratching property.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Wood Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Paper (AREA)
- Packaging Frangible Articles (AREA)
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Abstract
Description
本発明者らは、電子部材等の製品欠陥をもたらす付着異物についての分析を進めた。その結果、当該付着異物は、樹脂分が凝集した凝集物であり、数十μm以上の大きさを有していることが判明した。さらに、当該付着異物は、アルミニウムを含有していることが判明した。
本実施形態のガラス板用合紙は、セルロースパルプを主成分としている。セルロースパルプとしては、各種のセルロースパルプを1種または2種以上を混合して使用することができる。セルロースパルプとしては、例えば、クラフトパルプ(KP)、サルファイトパルプ(SP)、ソーダパルプ(AP)等の化学パルプ;セミケミカルパルプ(SCP)、ケミグランドウッドパルプ(CGP)等の半化学パルプ;砕木パルプ(GP)、サーモメカニカルパルプ(TMP、BCTMP)、リファイナーグランドウッドパルプ(RGP)等の機械パルプ;および楮、三椏、麻、ケナフ等を原料とする非木材繊維パルプ等が挙げられる。木材パルプの場合は、針葉樹パルプでも広葉樹パルプでもよく、またはこれらを混合したものでもよい。さらに、木材パルプとしては、木材由来の粘着性天然樹脂分の含有量が低いクラフトパルプ(KP)が好適である。ここで、セルロースパルプを主成分とするとは、合紙の質量に対して、セルロースパルプが50質量%を超えること、好ましくは70質量%以上、さらに好ましくは90質量%以上であることを意味する。
ガラス板用合紙の抄紙時に用いる抄紙用薬品については、ガラス表面を汚染せず、ガラス表面を傷付けない範囲内で、公知の各種薬品を使用することができる。抄紙用薬品としては、例えば、ロジン、スチレン・マレイン酸、アルケニル無水コハク酸、アルキルケテンダイマー等のサイズ剤、ポリアクリルアミド等の紙力増強剤、濾水歩留り向上剤、ポリアミドポリアミンエピクロルヒドリン等の耐水化剤、柔軟剤、帯電防止剤、消泡剤、スライムコントロール剤、填料、染料等が挙げられる。これらの抄紙用薬品はいずれもガラス板を汚染する恐れを有するものであるので、添加する場合であっても、合計で0.1質量%以下とすることが好ましい。
ガラス板用合紙の製造方法には特に制限はなく、種々の抄紙機を用いて、適切な抄造条件を選択することによって、抄造することができる。抄紙機としては、具体的に、長網フォーマ、ツインワイヤーフォーマ、円網フォーマ、傾斜フォーマなどを挙げることができる。ガラス板用合紙の層構成は、単層であってもよいし、多層であってもよい。
ガラス板用合紙の坪量は、小さい方が運搬時の質量が少なくなるため好ましいが、小さ過ぎると、ガラス板に対して十分な緩衝性を付与することができない。一方、合紙の坪量は、ある程度大きい方が緩衝性の点で好ましいが、大き過ぎると運搬時の質量が大きくなり好ましくない。緩衝性と運搬容易性とのバランスを考慮して、合紙の坪量は10~100g/m2である。合紙の坪量は、好ましくは35~80g/m2である。
合紙中のアルミニウム含有率(質量%)は、蛍光X線分析装置(スペクトリス社製、PW2404)を用い、予め所定量のアルミニウムを含有する合紙を用いて作成した検量線によって求めた。
ガラス合紙をJIS P8251に準じて灰化処理した。次に、得られた灰中のタルク含有率(質量%)を蛍光X線回折装置(リガク社製、RINT-UltimaIII)を用い、予め所定量のタルクを含有する合紙を用いて作成した検量線によって求めた。ガラス合紙中のタルク含有率mは次式(1)によって求めた。
m=(b/a)×c×100 ・・・(1)
ここで、m:タルク含有率(質量%)
a:ガラス合紙の質量(g)
b:灰分の質量(g)
c:灰中のタルクの含有率(質量%)
(ガラス板表面の汚染試験)
300mm×300mmのフラットパネルディスプレイ用ガラス板に、310mm×310mmガラス板用合紙を当て、0.7MPaで10秒間圧力を掛けるプレス操作を繰り返し行った。すなわち、300mm×300mmのフラットパネルディスプレイ用ガラス板は同一として、310mm×310mmガラス板用合紙を1回プレスする毎に新規なものに変えて、100回プレス操作を繰返し、試験後のフラットパネルディスプレイ用ガラス板を得た。
上記試験後のフラットパネルディスプレイ用ガラス板の表面を水で洗い流し、次に、スポットライトをガラス板表面に当てて、ガラス板表面の汚れを目視および顕微鏡にてカウントした。ガラス板汚染性の評価は以下のように行った。
◎:汚れ0個
○:汚れ1個
×:2個以上の汚れあり
(ガラス板表面の傷入り試験)
300mm×300mmのフラットパネルディスプレイ用ガラス板に、310mm×310mmガラス合紙を当て、0.7MPaで10秒間プレスを行なう方法において、300mm×300mmのフラットパネルディスプレイ用ガラス板は同一として、310mm×310mmガラス合紙を1回プレスする毎に新規なものに変えて、2000回プレスを繰返し、試験後のフラットパネルディスプレイ用ガラス板を得た。
上記試験後のフラットパネルディスプレイ用ガラス板表面をブラッシング洗浄した後、スポットライトをガラス板表面に当て、ガラス板表面の傷を目視及び顕微鏡にてカウントした。傷入り性の評価は以下のように行った。
○:0個~4個の傷あり
×:5個以上の傷あり
タルク含有率が0質量%の市販NBKP(針葉樹晒クラフトパルプ)100%のパルプスラリー(叩解度450mlcsf)に硫酸アルミニウムその他の抄紙薬品を添加せずに長網抄紙機で抄紙し、乾燥させ、坪量50g/m2のガラス板用合紙を得た。
絶乾パルプ質量に対して硫酸アルミニウム16水和物を1質量%添加したパルプスラリーを使用した以外は実施例1と同様にしてガラス板用合紙を得た。得られたガラス板用合紙のアルミニウム含有率は、0.08質量%であった。
タルク含有率が0.2質量%の市販NBKP(針葉樹晒クラフトパルプ)100%パルプスラリーを使用した以外は実施例1と同様にしてガラス板用合紙を得た。得られたガラス板用合紙のタルク含有率は、0.05質量%であった。
硫酸アルミニウム16水和物を4質量%添加した以外は実施例2と同様にしてガラス板用合紙を得た。得られたガラス板用合紙のアルミニウム含有率は、0.31質量%であった。
タルク含有率が1質量%の市販NBKP(針葉樹晒クラフトパルプ)100%パルプスラリーを使用した以外は実施例1と同様にしてガラス板用合紙を得た。得られたガラス板用合紙のタルク含有率は、0.25質量%であった。
叩解度を150mlcsfとした以外は比較例2と同様にしてガラス板用合紙を得た。
Claims (3)
- セルロースパルプを主成分とし、アルミニウム含有率が0.2質量%未満であり、坪量が10~100g/m2であることを特徴とするガラス板用合紙。
- 前記アルミニウム含有率が0.01質量%未満であることを特徴とする請求項1に記載のガラス板用合紙。
- タルク含有率が0.1質量%未満であることを特徴とする請求項1または請求項2に記載のガラス板用合紙。
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CN201880020296.XA CN110475931A (zh) | 2017-03-24 | 2018-02-16 | 玻璃板用衬纸 |
US16/496,205 US11913172B2 (en) | 2017-03-24 | 2018-02-16 | Glass plate interleaving paper |
KR1020197027781A KR20190116502A (ko) | 2017-03-24 | 2018-02-16 | 유리판용 합지 |
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JP2022009054A (ja) | 2022-01-14 |
JP2023033283A (ja) | 2023-03-10 |
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TW201840455A (zh) | 2018-11-16 |
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JP7237818B2 (ja) | 2023-03-13 |
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