JP4428679B2 - Base paper for decorative sheet - Google Patents
Base paper for decorative sheet Download PDFInfo
- Publication number
- JP4428679B2 JP4428679B2 JP2000298446A JP2000298446A JP4428679B2 JP 4428679 B2 JP4428679 B2 JP 4428679B2 JP 2000298446 A JP2000298446 A JP 2000298446A JP 2000298446 A JP2000298446 A JP 2000298446A JP 4428679 B2 JP4428679 B2 JP 4428679B2
- Authority
- JP
- Japan
- Prior art keywords
- paper
- base paper
- decorative sheet
- strength agent
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Description
【0001】
【発明の属する技術分野】
本発明は、木質系ボード(合板、パーティクルボード、繊維板等)に貼り合わせることにより表面の意匠性を良くするために用いられる化粧シート用原紙に関する。
【0002】
【従来の技術】
化粧シート用原紙には、用途・目的により、薄葉紙、強化紙、含浸紙など、様々な種類がある。これらのうち含浸紙は、アクリル樹脂等が含浸されているため強度特性に優れており、各種用途に多用されている。
この含浸紙の強度特性の中で、最近特に耐セロテープ性、化粧材表面にセロテープを貼ってその後セロテープを剥がしたときに化粧紙が剥がれにくい特性、が重要視されてきている。
【0003】
かかる耐セロテープ特性を向上させる方法としては含浸率を上げる方法が一般的であるが、コストアップになるばかりでなくその効果も小さい。そこで含浸後に更に樹脂コートする方法(例えば、特開昭63−190029号公報)も報告されているが、工程が増えるために煩雑となる。
【0004】
一方、内添乾燥紙力増強剤を添加して抄造した原紙を含浸する方法(例えば、特開昭63−190094号公報)も提案されている。本方法によると煩雑さはないものの、一般的に乾燥紙力増強剤として使用されているものはアニオン性のものであり、目標の効果が得られるまでその添加量を増やすと顔料の定着が悪くなり、抄紙トラブルを起こしやすいという欠点があった。
【0005】
【発明が解決しようとする課題】
本発明は、工程を増やすことなく、かつ顔料の定着に影響を与えず安定生産できる、耐セロテープ性の優れた含浸紙、化粧シート用原紙を提供することを課題とする。
【0006】
【課題を解決するための手段】
本発明者らは、顔料の定着と関係のあるゼータ電位(ZP)に着目し、顔料のZPにほとんど影響を与えない紙力剤を内添すると、安定生産でき、工程も増やすことなく、耐セロテープ性に優れた化粧シート用原紙が得られることを見出し、本発明に到達した。
すなわち本発明は、パルプを主体とし両性ポリアクリルアミド系紙力剤を0.5〜2重量%内添した抄造原紙に、5〜25重量%の熱可塑性樹脂を含浸し、平滑化処理を施した化粧シート用原紙、を提供するものである。
【0007】
以下、本発明を詳細に説明する。
本発明に使用される抄造原紙は、パルプを主体とするもので、パルプとしてはLBKP、あるいはLBKPとNBKPの混合されたものが使用され、叩解度は300〜500mlCSFが好ましい。
【0008】
本発明で用いられる両性ポリアクリルアミド(PAM)系紙力剤は、0.5%〜2.0重量%内添される。
両性PAM系紙力剤としては、アクリルアミドを主鎖として両性のものであればいずれでもよく、例えば、荒川化学工業製ポリストロン等を例示することができる。
内添量が0.5重量%未満では十分な耐セロテープ性が得られず、一方、2.0重量%を超えると地合が悪くなるため好ましくない。
【0009】
抄造原紙は、更に、通常用いられる顔料(酸化チタン等)、湿潤紙力剤(ポリアミドポリアミン樹脂等)、硫酸アルミニウム、アルミン酸ナトリウム、等が添加され、長網あるいは円網式で抄造される。
【0010】
抄造原紙は熱可塑性樹脂で5〜25重量%含浸される。用いられる熱可塑性樹脂としては、アクリル酸エステル系、スチレンブタジエンゴム系、アクリロニトリルブタジエンゴム系、エチレン酢酸ビニル共重合体系等を例示することができ、これらは単独あるいは混合して使用することができる。
含浸率が5重量%未満であると十分な耐セロテープ性が得られず、一方、25重量%を超えるとインク着肉性が劣り印刷適性が良くないので好ましくない。
【0011】
熱可塑性樹脂には、メラミン樹脂、ユリア樹脂等の熱硬化性樹脂を混合することもでき、また、紙への浸透性を良くするためにアニオン性の界面活性剤を添加することもできる。
【0012】
含浸後、ハードキャレンダー、ソフトキャレンダー、スーパーキャレンダー等を用いて平滑化処理が施される。平滑化処理により、平滑度を100秒以上にすることが望ましい。これ未満であると、印刷適性に問題が起こる場合があり好ましくない。
【0013】
【実施例】
以下実施例を挙げて本発明を具体的に説明する。
なお、実施例、比較例における測定・評価方法は次ぎの通りである。
(1)ZP:ゼータ電位測定装置LEZA−600(大塚電子製)により測定した。
(2)填料歩留まり:紙の灰分を測定し、数1により算出した。
【0014】
【数1】
【0015】
(3)層間剥離強度:JIS P−8139B法による。
(4)平滑度:JIS P−8119に定められている試験方法に従い、王研式平滑度計により測定した。
(5)耐セロテープ性:試験片(250mm×100mm)をグラビア印刷機(三正精機:PROOF MASTER)を用いて赤ベタ印刷した。これを酢酸ビニルエマルジョン接着剤(中央理化工業、リカボンドAC−500)を用いてパーティクルボードに貼り合わせた。12時間放置後、セロテープ(積水化学、セキスイセロテープ、24mm×35m)を長さ5cmに切り、手で試験片の上に貼り、更にセロテープの上からローラーを用いて手で5往復させてしっかり張り付けた試験体とした。試験体を40℃の乾燥機で48時間、次いで20℃65%RH条件下の恒温恒湿室に12時間放置した。これを、ボードに対して垂直に手でセロテープを剥がし、試験片の剥け具合を目視評価した。
評価:全く剥けていないもの5点、セロテープが貼ってあったところ全面剥けてしまっているもの1点
(6)地合:地合(良)を5点、地合(悪)を1点とし、目視評価した。
【0016】
実施例1
叩解度400ml(C.S.F.)に叩解された広葉樹晒しクラフトパルプ(LBKP)100部に、二酸化チタン15部、両性PAM系紙力剤(荒川化学工業製、ポリストロン1213)1.5部、湿潤紙力剤(ポリアミドポリアミン系)1部、硫酸アルミニウム1部、アルミン酸ナトリウム0.5部を添加して調整した紙料を抄造した。
この抄造原紙にアクリル系エマルジョン(日本ゼオン製、Nipol LX851)を20%(重量比)含浸した。含浸液には浸透剤として少量のドデシル硫酸ナトリウムを加えた。
更にこの含浸紙をキャレンダー処理し、化粧シート用原紙を得た。
【0017】
実施例2
両性PAM系紙力剤を1.0部にした以外は実施例1と同様に実施し、化粧シート用原紙を得た。
【0018】
比較例1
実施例1において、両性PAM系紙力剤を添加しない以外は実施例1と同様に実施し、化粧シート用原紙を得た。
【0019】
比較例2
実施例1において、両性PAM系紙力剤にかえて、アニオン性PAM系紙力剤(荒川化学工業製、ポリストロン117)1.5部にした以外は実施例1と同様に実施し、化粧シート用原紙を得た。
【0020】
比較例3
実施例1において、両性PAM系紙力剤にかえて、カルボキシメチルセルロース(CMC)系紙力剤(昭和高分子製、ポリフィックスHA−33、アニオン性)0.3部にした以外は実施例1と同様に実施し、化粧シート用原紙を得た。
【0021】
比較例4
両性PAM系紙力剤を0.3部にした以外は実施例1と同様に実施し、化粧シート用原紙を得た。
【0022】
比較例5
両性PAM系紙力剤を2.5部にした以外は実施例1と同様に実施し、化粧シート用原紙を得た。
【0023】
実施例1、2及び比較例1〜5で得られた化粧シート用原紙の評価結果を表1に示した。
【0024】
【表1】
【0025】
【発明の効果】
本発明は、顔料の定着に関係あるゼータ電位に着目し、従来使用されているアニオン性紙力剤では顔料のZPがよりマイナスに帯電するため定着が悪かったこと、両性PAM系紙力剤を添加することにより顔料のZPがほとんど変化しないこと、を見出し、安定して抄造原紙を製造でき、かつ新たな工程を必要とせず゛、得られた化粧シート用原紙は優れた耐セロテープ性を持つ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a base sheet for a decorative sheet that is used to improve the surface design by bonding to a wooden board (plywood, particle board, fiber board, etc.).
[0002]
[Prior art]
There are various types of decorative sheet base paper, such as thin paper, reinforced paper, and impregnated paper, depending on applications and purposes. Among these, the impregnated paper is excellent in strength characteristics because it is impregnated with an acrylic resin or the like, and is widely used for various applications.
Among the strength characteristics of the impregnated paper, recently, importance has been placed on the resistance to cello tape and the characteristic that the decorative paper is not easily peeled off when the cello tape is applied to the surface of the decorative material and then the cello tape is peeled off.
[0003]
As a method for improving the cello tape resistance, a method of increasing the impregnation rate is common, but not only the cost is increased, but the effect is small. Therefore, a method of further resin coating after impregnation (for example, Japanese Patent Application Laid-Open No. 63-190029) has been reported, but it becomes complicated due to an increase in the number of steps.
[0004]
On the other hand, a method of impregnating a base paper made by adding an internal dry paper strength enhancer (for example, JP-A-63-190094) has also been proposed. Although there is no complication according to this method, what is generally used as a dry paper strength enhancer is anionic, and if the amount added is increased until the target effect is obtained, pigment fixation becomes poor. Therefore, there was a drawback that papermaking troubles were likely to occur.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide an impregnated paper excellent in cello tape resistance and a decorative sheet base paper that can be stably produced without increasing the number of steps and without affecting the fixing of the pigment.
[0006]
[Means for Solving the Problems]
The inventors focused on the zeta potential (ZP), which is related to the fixing of the pigment, and by adding a paper strength agent that hardly affects the ZP of the pigment, stable production can be achieved without increasing the number of steps, The present inventors have found that a base paper for a decorative sheet excellent in cello tape properties can be obtained, and reached the present invention.
That is, the present invention impregnates 5-25% by weight of a thermoplastic resin into a base paper made of pulp and containing 0.5-2% by weight of an amphoteric polyacrylamide-based paper strength agent, and then smoothed it. A decorative sheet base paper is provided.
[0007]
Hereinafter, the present invention will be described in detail.
The papermaking base paper used in the present invention is mainly composed of pulp. As the pulp, LBKP or a mixture of LBKP and NBKP is used, and the beating degree is preferably 300 to 500 mlCSF.
[0008]
The amphoteric polyacrylamide (PAM) paper strength agent used in the present invention is added in an amount of 0.5% to 2.0% by weight.
As the amphoteric PAM-based paper strength agent, any amphoteric one having acrylamide as the main chain may be used, and examples thereof include Polystron manufactured by Arakawa Chemical Industries.
If the amount of internal addition is less than 0.5% by weight, sufficient cello tape resistance cannot be obtained. On the other hand, if it exceeds 2.0% by weight, the formation becomes worse, which is not preferable.
[0009]
The paper base paper is further made into a long net or circular net type paper by adding a commonly used pigment (titanium oxide or the like), a wet paper strength agent (polyamide polyamine resin or the like), aluminum sulfate, sodium aluminate, or the like.
[0010]
The base paper is impregnated with a thermoplastic resin in an amount of 5 to 25% by weight. Examples of the thermoplastic resin to be used include acrylic acid ester series, styrene butadiene rubber series, acrylonitrile butadiene rubber series, ethylene vinyl acetate copolymer series, and the like, and these can be used alone or in combination.
If the impregnation rate is less than 5% by weight, sufficient cello tape resistance cannot be obtained.
[0011]
Thermoplastic resins such as melamine resins and urea resins can be mixed with the thermoplastic resin, and an anionic surfactant can be added to improve the permeability to paper.
[0012]
After the impregnation, a smoothing process is performed using a hard calendar, a soft calendar, a super calendar, or the like. It is desirable to set the smoothness to 100 seconds or more by the smoothing process. If it is less than this, there may be a problem in printability, which is not preferable.
[0013]
【Example】
Hereinafter, the present invention will be specifically described with reference to examples.
In addition, the measurement / evaluation method in an Example and a comparative example is as follows.
(1) ZP: Measured with a zeta potential measuring device LEZA-600 (manufactured by Otsuka Electronics).
(2) Filler yield: The ash content of paper was measured and calculated according to Equation 1.
[0014]
[Expression 1]
[0015]
(3) Interlaminar peel strength: According to JIS P-8139B method.
(4) Smoothness: Measured with a Oken type smoothness meter according to the test method defined in JIS P-8119.
(5) Resistance to cello tape: A test piece (250 mm × 100 mm) was red-solid printed using a gravure printing machine (Sansho Seiki: PROOF MASTER). This was bonded to the particle board using a vinyl acetate emulsion adhesive (Chuo Rika Kogyo, Rikabond AC-500). After standing for 12 hours, cut the tape (Sekisui Chemical Co., Ltd., Sekisui Cello Tape, 24mm x 35m) to a length of 5cm, paste it on the test piece by hand, and then stick it firmly on the cello tape by using a roller for 5 reciprocations by hand. It was set as the test body. The specimen was left in a 40 ° C. dryer for 48 hours and then in a constant temperature and humidity room at 20 ° C. and 65% RH for 12 hours. The cellophane tape was peeled off by hand perpendicularly to the board, and the degree of peeling of the test piece was visually evaluated.
Evaluation: 5 points that have not been peeled off, 1 point that has been peeled off when the tape is attached (6) Formation: 5 points for formation (good), 1 point for formation (bad) Visually evaluated.
[0016]
Example 1
100 parts of hardwood bleached kraft pulp (LBKP) beaten to a beating degree of 400 ml (CSF), 15 parts of titanium dioxide, amphoteric PAM paper strength agent (Arakawa Chemical Industries, Polystron 1213) 1.5 A paper stock prepared by adding 1 part of wet paper strength agent (polyamide polyamine), 1 part of aluminum sulfate and 0.5 part of sodium aluminate was made.
This paper base paper was impregnated with 20% (by weight) of an acrylic emulsion (Nipol LX851 manufactured by Nippon Zeon). A small amount of sodium dodecyl sulfate was added to the impregnating solution as a penetrant.
Furthermore, the impregnated paper was calendered to obtain a base paper for a decorative sheet.
[0017]
Example 2
A decorative sheet base paper was obtained in the same manner as in Example 1 except that the amphoteric PAM-based paper strength agent was changed to 1.0 part.
[0018]
Comparative Example 1
In Example 1, it carried out similarly to Example 1 except not adding an amphoteric PAM type paper strength agent, and obtained the base paper for decorative sheets.
[0019]
Comparative Example 2
In Example 1, instead of the amphoteric PAM paper strength agent, an anionic PAM paper strength agent (Arakawa Chemical Industries, Polystron 117) was used in the same manner as in Example 1, except that Sheet base paper was obtained.
[0020]
Comparative Example 3
In Example 1, instead of the amphoteric PAM-based paper strength agent, Example 1 was used except that 0.3 parts of carboxymethyl cellulose (CMC) -based paper strength agent (Showa Polymer, Polyfix HA-33, anionic) was used. In the same manner as above, a base paper for a decorative sheet was obtained.
[0021]
Comparative Example 4
A decorative sheet base paper was obtained in the same manner as in Example 1 except that the amphoteric PAM-based paper strength agent was changed to 0.3 part.
[0022]
Comparative Example 5
A decorative sheet base paper was obtained in the same manner as in Example 1 except that the amphoteric PAM paper strength agent was changed to 2.5 parts.
[0023]
Table 1 shows the evaluation results of the base papers for decorative sheets obtained in Examples 1 and 2 and Comparative Examples 1 to 5.
[0024]
[Table 1]
[0025]
【The invention's effect】
The present invention pays attention to the zeta potential related to the fixing of the pigment, and the anionic paper strength agent that has been used conventionally has a negative fixing property because the ZP of the pigment is more negatively charged. It was found that the ZP of the pigment is hardly changed by the addition, and the paper base paper can be stably produced and does not require a new process. The resulting base paper for decorative sheets has excellent cello tape resistance. .
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2000298446A JP4428679B2 (en) | 2000-09-29 | 2000-09-29 | Base paper for decorative sheet |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000298446A JP4428679B2 (en) | 2000-09-29 | 2000-09-29 | Base paper for decorative sheet |
Publications (2)
Publication Number | Publication Date |
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JP2002105886A JP2002105886A (en) | 2002-04-10 |
JP4428679B2 true JP4428679B2 (en) | 2010-03-10 |
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JP2000298446A Expired - Lifetime JP4428679B2 (en) | 2000-09-29 | 2000-09-29 | Base paper for decorative sheet |
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JP (1) | JP4428679B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3866601B2 (en) * | 2002-03-28 | 2007-01-10 | 株式会社興人 | Manufacturing method of base paper for decorative sheet |
JP2006183218A (en) * | 2004-12-28 | 2006-07-13 | Daio Paper Corp | Paper for decorative laminated sheet and method for producing the paper |
-
2000
- 2000-09-29 JP JP2000298446A patent/JP4428679B2/en not_active Expired - Lifetime
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