TW201842261A - Raw paper for thermal transfer paper and thermal transfer paper excellent in tensile strength, tensile strength after heat treatment, printing property and workability - Google Patents
Raw paper for thermal transfer paper and thermal transfer paper excellent in tensile strength, tensile strength after heat treatment, printing property and workability Download PDFInfo
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本發明關於熱轉印紙用原紙以及使用此熱轉印紙用原紙的熱轉印紙。The present invention relates to a base paper for thermal transfer paper and a thermal transfer paper using the base paper for the thermal transfer paper.
將以紙漿作為原料使用抄紙機抄出的濕紙的僅一面壓合在鏡面狀的圓筒形乾燥機（以下稱為楊克式乾燥機(yankee dryer)）上進行乾燥而製造的紙張，具有非常高的平滑度，因此稱之為單光紙。Paper which is produced by using a pulp as a raw material and which is dried by a mirror-like cylindrical dryer (hereinafter referred to as a yankee dryer) by using only one side of the wet paper which is copied by a paper machine, has a very high High smoothness, so it is called single-gloss paper.
單光紙用作包裝用途、製袋用途、加工用途等，在其接觸於楊克式乾燥機進行乾燥的平滑面側上實施印刷的情況居多。因此，已知有許多提高平滑面側的印刷適應性、加工適應性等的發明（例如，專利文獻1、專利文獻2）。 [先前技術文獻] [專利文獻]Mono-textile paper is used for packaging applications, bag making applications, processing applications, etc., and printing is performed on the smooth side of the Yankee dryer which is dried. Therefore, many inventions have been known which improve the printing suitability and processing suitability on the smooth surface side (for example, Patent Document 1 and Patent Document 2). [Prior Technical Literature] [Patent Literature]
專利文獻1：日本專利第4841515號公報。 專利文獻2：日本專利第4350145號公報。Patent Document 1: Japanese Patent No. 4841515. Patent Document 2: Japanese Patent No. 4350145.
[發明所欲解決的問題][Problems to be solved by the invention]
作為使用單光紙的另一種用途，可以考慮向熱轉印紙的方向發展。此用途是指，在單光紙的平滑面上使用凹版印刷機、噴墨印刷機等來印刷各種圖案，並將此圖案熱轉印在鋁、不銹鋼等金屬製的基材等上，從而提供外觀設計性優良的物品。其製造的順序如下。首先，在單光紙的平滑面上使用昇華墨，例如印刷木紋風格圖案，從而製造熱轉印紙。接下來，在所獲得的熱轉印紙上賦予水性糊，或在真空下進行緊貼，從而使基材緊貼。將由基材向外露出的熱轉印紙的部分使用切割器切斷去除後，通過加熱將圖案轉印在基材上。之後，當從基材剝離熱轉印紙時，則可以獲得表面上實施了木紋風格的圖案的基材。此用途主要用於建材。As another use of single-gloss paper, development in the direction of thermal transfer paper can be considered. This application refers to printing various patterns on a smooth surface of a single glossy paper using a gravure printing machine, an ink jet printer, or the like, and thermally transferring the pattern onto a metal substrate such as aluminum or stainless steel to provide Items with excellent design. The order of manufacture is as follows. First, a sublimation ink, such as a wood grain pattern, is printed on a smooth surface of a single glossy paper to produce a thermal transfer paper. Next, an aqueous paste is applied to the obtained thermal transfer paper, or adhered under vacuum to adhere the substrate. After the portion of the thermal transfer paper exposed outward from the substrate is cut off using a cutter, the pattern is transferred onto the substrate by heating. Thereafter, when the thermal transfer paper is peeled off from the substrate, a substrate having a pattern of a wood grain on the surface can be obtained. This use is mainly used for building materials.
另外，作為另一種方法，還可以將基材與印刷後的熱轉印紙緊貼後，使用熱壓機來進行加熱、加壓，從而將圖案轉印在基材上。Further, as another method, the substrate may be adhered to the substrate by heat and pressure using a hot press after the substrate and the heat transfer paper after printing are adhered to each other.
如上所述，作為建材用途的熱轉印紙來使用的情況下，需要經過上述步驟。因此，作為熱轉印紙用原紙需要具有優良的拉伸強度以及加熱處理後的拉伸強度等性能。另外，為了提高圖案的完成效果，其需要具有優良的印刷適用性。另外，從向基材轉印以及從基材上剝離時的作業性的觀點出發，其優選為輕量的。As described above, when it is used as a thermal transfer paper for building materials, it is necessary to go through the above steps. Therefore, the base paper for thermal transfer paper is required to have excellent tensile strength and tensile strength after heat treatment. In addition, in order to improve the finish effect of the pattern, it is required to have excellent printing suitability. Moreover, it is preferable that it is lightweight from the viewpoint of workability at the time of transfer to a base material and peeling from a base material.
在以往的單光紙中，並沒有對於上述用途進行設想並進行為了賦予所需的特性的研究。本發明是鑒於上述情況而提出的。即，本發明的課題是提供一種拉伸強度、加熱處理後的拉伸強度、印刷性以及作業性優良的熱轉印紙用原紙以及使用此原紙的熱轉印紙。In the conventional single-gloss paper, the above-mentioned use is not conceived and research for imparting desired characteristics is performed. The present invention has been made in view of the above circumstances. In other words, an object of the present invention is to provide a base paper for thermal transfer paper having excellent tensile strength, tensile strength after heat treatment, printability, and workability, and a thermal transfer paper using the base paper.
本案諸位發明人為了保持作為單光紙的特性，同時降低基重並提高加熱處理後的拉伸強度，對減少硫酸鋁的添加量等進行了研究。本發明是基於上述研究而完成的。即，本發明具有以下構成。In order to maintain the characteristics of the single-light paper, the inventors of the present invention have reduced the basis weight and increased the tensile strength after the heat treatment, and have studied the reduction of the amount of aluminum sulfate added. The present invention has been completed based on the above studies. That is, the present invention has the following constitution.
（1）一種熱轉印紙用原紙，其特徵在於，以纖維素紙漿作為主要成分；密度為0.75～0.85g／cm3 ；基重為20～50g／m2 ；單面為平滑面，此平滑面的王研式平滑度為500秒以上；硫酸離子的含量為0.6mg／l以下。(1) A base paper for thermal transfer paper characterized in that cellulose pulp is used as a main component; a density of 0.75 to 0.85 g/cm 3 ; a basis weight of 20 to 50 g/m 2 ; and a smooth surface on one side, which is smooth The surface roughness of the surface is 500 seconds or more; the content of sulfate ions is 0.6 mg/l or less.
（2）根據前述（1）中所述的熱轉印紙用原紙，其中，陽離子化澱粉的含量為0.01質量%以下，濕潤紙力增強劑的含量為0.10～0.35質量%。(2) The base paper for thermal transfer paper according to the above (1), wherein the content of the cationized starch is 0.01% by mass or less, and the content of the wet paper strength enhancer is 0.10 to 0.35% by mass.
（3）根據前述（2）中所述的熱轉印紙用原紙，其中，上述濕潤紙力增強劑是從聚醯胺多胺環氧氯丙烷系樹脂、脲醛系樹脂以及三聚氰胺甲醛系樹脂中選出的一種以上。(3) The base paper for thermal transfer paper according to the above (2), wherein the wet paper strength enhancer is selected from the group consisting of polyamine polyamine epichlorohydrin resin, urea formaldehyde resin, and melamine formaldehyde resin. More than one.
（4）根據前述（1）～（3）中任一項所述的熱轉印紙用原紙，其中，含有從松香系上漿劑、烯基琥珀酸酐系上漿劑、陽離子聚合物系上漿劑以及烷基烯酮二聚體系上漿劑中選出的一種以上。The base paper for thermal transfer paper according to any one of the above aspects of the present invention, which contains a rosin-based sizing agent, an alkenyl succinic anhydride-based sizing agent, and a cationic polymer sizing agent. One or more selected from the group consisting of a sizing agent and an alkyl ketene dimerization system.
（5）根據前述（1）～（4）中任一項所述的熱轉印紙用原紙，其中，上述纖維素紙漿含有闊葉木牛皮紙漿或針葉木牛皮紙漿。The base paper for thermal transfer paper according to any one of the above aspects, wherein the cellulose pulp contains hardwood kraft pulp or softwood kraft pulp.
（6）根據前述（1）～（5）中任一項所述的熱轉印紙用原紙，其中，以220℃加熱處理25分鐘後的拉伸強度降低率為20％以下。The base paper for thermal transfer paper according to any one of the above-mentioned items, wherein the reduction ratio of the tensile strength after heat treatment at 220 ° C for 25 minutes is 20% or less.
（7）根據前述（1）～（6）中任一項所述的熱轉印紙用原紙，其中，以220℃加熱處理25分鐘後的濕潤拉伸強度為0.80kN／m以上。(7) The base paper for thermal transfer paper according to any one of the above aspects, wherein the wet tensile strength after heat treatment at 220 ° C for 25 minutes is 0.80 kN / m or more.
（8）根據前述（1）～（7）中任一項所述的熱轉印紙用原紙，其中，通過按照日本製漿造紙工業協會編號為67：2000（JAPAN TAPPI No. 67：2000）的方法所測量的吸油度為400秒以上。(8) The base paper for thermal transfer paper according to any one of the above (1) to (7), wherein, according to the Japan Pulp and Paper Industry Association No. 67:2000 (JAPAN TAPPI No. 67:2000) The oil absorption measured by the method is 400 seconds or more.
（9）根據前述（1）～（8）中任一項所述的熱轉印紙用原紙，其中，被轉印材料由金屬、陶瓷或樹脂構成。The base paper for thermal transfer paper according to any one of the above aspects, wherein the material to be transferred is made of metal, ceramic or resin.
（10）一種熱轉印紙，其特徵在於，具有前述（1）～（9）中任一項所述的熱轉印紙用原紙、和形成於此熱轉印紙用原紙的平滑面側的墨層，並且所述墨層含有墨和黏合劑樹脂。 [發明功效](10) A thermal transfer paper comprising: the base paper for thermal transfer paper according to any one of (1) to (9), and the ink layer on the smooth surface side of the base paper for thermal transfer paper. And the ink layer contains an ink and a binder resin. [Effects of invention]
本發明的熱轉印紙用原紙具有優良的拉伸強度、加熱處理後的拉伸強度、印刷性以及作業性。本發明的熱轉印紙使用了該熱轉印紙用原紙，因此適用於向基材熱轉印圖案的用途。The base paper for thermal transfer paper of the present invention has excellent tensile strength, tensile strength after heat treatment, printability, and workability. Since the thermal transfer paper of the present invention uses the base paper for thermal transfer paper, it is suitable for use in thermally transferring a pattern to a substrate.
[用以實施發明的形態][Formation for carrying out the invention]
以下，具體說明本發明的實施方式。以下所述的結構要素的說明是基於代表性的實施方式和具體示例而進行的，但本發明並不限定於如上所述的實施方式。需要說明的是，在本說明書中使用“～”來表示的數值範圍是指，包含在“～”前後所描述的數值作為下限值和上限值的範圍。Hereinafter, embodiments of the present invention will be specifically described. The description of the constituent elements described below is based on representative embodiments and specific examples, but the present invention is not limited to the embodiments described above. It is to be noted that the numerical range expressed by "~" in the present specification means a range including the numerical values described before and after "~" as the lower limit value and the upper limit value.
本實施方式的熱轉印紙用原紙由單光紙構成。另外，本實施方式的熱轉印紙具有形成於熱轉印紙用原紙的平滑面側的墨層。墨層含有墨和黏合劑樹脂。墨層通過凹版印刷機、噴墨印刷機等形成，並且具有各種圖案。The base paper for thermal transfer paper of the present embodiment is composed of a single-gloss paper. Moreover, the thermal transfer paper of this embodiment has the ink layer formed in the smooth surface side of the base paper for thermal transfer paper. The ink layer contains an ink and a binder resin. The ink layer is formed by an intaglio printing machine, an inkjet printer, or the like, and has various patterns.
作為轉印對象的基材（被轉印材料）優選為由金屬、陶瓷或樹脂構成的各種形狀的構件。本實施方式的熱轉印紙用於為傢俱、建材等賦予外觀設計性，但並不限定於這些基材。金屬是鋁、不銹鋼等，無特殊限定。樹脂為合成樹脂、天然樹脂等，無特殊限定。The substrate (transfer material to be transferred) to be transferred is preferably a member of various shapes composed of metal, ceramic or resin. The thermal transfer paper of the present embodiment is used for imparting design properties to furniture, building materials, and the like, but is not limited to these substrates. The metal is aluminum, stainless steel, etc., and is not particularly limited. The resin is a synthetic resin, a natural resin, or the like, and is not particularly limited.
墨層轉印至基材的操作順序如下。 （1）在熱轉印紙上賦予水性糊之後，使熱轉印紙緊貼在基材上。或者，將熱轉印紙和基材對齊後，通過真空處理使兩者緊貼。 （2）將從基材向外露出的部分的熱轉印紙使用切割器切斷去除。 （3）施加170℃～220℃左右的熱量，使墨層（熱轉印紙上的圖案）轉印在基材上。 （4）將圖案被轉印的熱轉印紙從基材剝離。此時，有時會追加使用塑膠膜（vinyl）等覆蓋基材和熱轉印紙，通過澆水使其冷卻等操作。The order of operation of transferring the ink layer to the substrate is as follows. (1) After the aqueous paste is applied to the thermal transfer paper, the thermal transfer paper is brought into close contact with the substrate. Alternatively, after the thermal transfer paper and the substrate are aligned, the two are brought into close contact by vacuum treatment. (2) The portion of the thermal transfer paper exposed to the outside of the substrate is cut and removed using a cutter. (3) Applying heat of about 170 ° C to 220 ° C to transfer the ink layer (pattern on the thermal transfer paper) onto the substrate. (4) The thermal transfer paper whose pattern was transferred was peeled off from the substrate. In this case, a substrate or a thermal transfer paper such as a vinyl film or the like may be additionally used, and the operation may be performed by watering and cooling.
另外，在使用熱壓機的情況下，在使基材與印刷後的熱轉印紙緊貼後，使用熱壓機來進行加熱、加壓，從而將墨層轉印在基材上。Further, in the case of using a hot press, after the substrate and the printed thermal transfer paper are brought into close contact with each other, heat and pressure are applied using a hot press to transfer the ink layer onto the substrate.
以下，對構成本實施方式的熱轉印紙用原紙的各個要素進行說明。 （紙漿） 熱轉印紙用原紙以纖維素紙漿作為主要成分。對於纖維素紙漿無特殊限制，但從強度的觀點出發優選含有化學紙漿。作為化學紙漿無特殊限定，但優選含有闊葉樹牛皮紙漿（LKP）或針葉樹牛皮紙漿（NKP）。紙漿可以是漂白紙漿，也可以是未漂白紙漿。此外，優選含有LKP和NKP兩種。Hereinafter, each element constituting the base paper for thermal transfer paper of the present embodiment will be described. (Pulp) The base paper for thermal transfer paper uses cellulose pulp as a main component. The cellulose pulp is not particularly limited, but preferably contains chemical pulp from the viewpoint of strength. The chemical pulp is not particularly limited, but preferably contains broadleaf kraft pulp (LKP) or conifer kraft pulp (NKP). The pulp can be either bleached pulp or unbleached pulp. Further, it is preferred to contain both LKP and NKP.
一般而言，相較於NKP，LKP纖維短且強度差，但由於抄出的紙張的質地、平滑性等優良，因此能夠改善印刷適用性。因此，在熱轉印紙用原紙中，LKP的含量相對於紙漿成分的總質量優選為40質量%以上，更優選為60質量%，進一步優選為80質量%以上。In general, the LKP fiber is shorter and inferior in strength than NKP, but the paper has good texture, smoothness, and the like, so that the printability can be improved. Therefore, in the base paper for thermal transfer paper, the content of LKP is preferably 40% by mass or more, more preferably 60% by mass, and still more preferably 80% by mass or more based on the total mass of the pulp component.
LKP的打漿度（游離度(freeness)）優選為250～400mlcsf，更優選為280～380mlcsf。當打漿度在上述範圍內時，能夠抄造出強度和平滑度更為優良的原紙。另外，由於後述的製紙用藥劑的固著位置增加，因此容易達到所期望的紙質。需要說明的是，紙漿的打漿度是依據JIS P 8121：2012來測量的數值。The degree of freeness (freeness) of LKP is preferably from 250 to 400 ml csf, more preferably from 280 to 380 ml csf. When the degree of beating is within the above range, it is possible to produce a base paper which is more excellent in strength and smoothness. Further, since the fixing position of the paper-making drug to be described later is increased, it is easy to achieve a desired paper quality. It should be noted that the degree of beating of the pulp is a value measured in accordance with JIS P 8121:2012.
另外，在熱轉印紙用原紙中，優選添加NKP。由於NKP的纖維長，因此能夠提高抄出的產品的拉伸強度。因此，NKP的含量相對於紙漿成分的總質量優選為5質量%以上，更優選為10質量%以上。Further, in the base paper for thermal transfer paper, NKP is preferably added. Since the fiber of NKP is long, the tensile strength of the product to be copied can be improved. Therefore, the content of NKP is preferably 5% by mass or more, and more preferably 10% by mass or more based on the total mass of the pulp component.
NKP的打漿度優選為500mlcsf以下，更優選為400mlcsf以下。如果NKP的打漿度在上述範圍內，則作為熱轉印紙用原紙能夠保證足夠的強度。The degree of freeness of NKP is preferably 500 ml csf or less, and more preferably 400 ml csf or less. If the degree of beating of the NKP is within the above range, sufficient strength can be secured as a base paper for thermal transfer paper.
紙漿成分中可以包含上述NKP和LKP以外的紙漿（以下，稱為其他紙漿）。作為其他紙漿，可舉例磨石磨木漿（SGP）、壓力磨石磨木漿（PGW）、精煉磨木槳（RGP）、熱磨漿（TGP）、化學磨木漿（CGP）、磨木槳（GP）、熱磨機械漿（TMP）等機械漿，由茶廢紙、牛皮信封廢紙、舊雜誌紙、舊報紙、傳單廢紙、辦公廢紙、舊瓦楞紙、高白廢紙、肯特廢紙、舊模造紙，舊土地證紙等製成的脫墨漿（DIP），或者由紅麻、麻、葦等非木材纖維化學或機械性地製成的紙漿等。相對於紙漿成分的總質量，其他紙漿的含量優選為小於3質量%，更優選為小於2質量%，進一步優選為小於1質量%。Pulp other than the above-mentioned NKP and LKP (hereinafter referred to as other pulp) may be contained in the pulp component. As other pulps, examples include grindstone wood pulp (SGP), pressure grindstone wood pulp (PGW), refining milled wood pulp (RGP), hot refining pulp (TGP), chemical ground wood pulp (CGP), and ground wood. Mechanical pulp such as paddle (GP), thermomechanical pulp (TMP), tea waste paper, cowhide envelope waste paper, old magazine paper, old newspaper, leaflet waste paper, office waste paper, old corrugated paper, high white waste paper, Kent Deinked pulp (DIP) made of waste paper, old mold paper, old land certificate paper, or pulp made chemically or mechanically from non-wood fibers such as kenaf, hemp, and enamel. The content of the other pulp is preferably less than 3% by mass, more preferably less than 2% by mass, still more preferably less than 1% by mass, based on the total mass of the pulp component.
一直以來，硫酸鋁作為成品率提高劑、上漿劑等固著劑被廣泛使用。但作為熱轉印紙用原紙來使用的情況下，由於在轉印時被加熱到200℃左右，因此加熱時由硫酸鋁產生的硫酸離子會將纖維素水解，使得加熱後的紙張拉伸強度大幅降低。於是，對於能夠抑制轉印時的加熱處理所引起的拉伸強度的降低的硫酸鋁的添加量進行了研究。其結果，證實了需要將熱轉印紙用原紙中的硫酸離子的含量控制在0.6mg／l以下。硫酸離子的含量優選在0.1～0.6mg／l的範圍內，更優選在0.2～0.6mg／l的範圍內。通過將硫酸離子的含量控制在上述範圍內，能夠抑制加熱處理後的拉伸強度降低。其中，紙張中的硫酸離子的含量可以使用離子層析儀進行測量。Aluminum sulfate has been widely used as a fixing agent such as a yield improving agent and a sizing agent. However, when it is used as a base paper for thermal transfer paper, since it is heated to about 200 ° C at the time of transfer, sulfate ions generated by aluminum sulfate during heating will hydrolyze cellulose, so that the tensile strength of the heated paper is large. reduce. Then, the amount of aluminum sulfate added which can suppress the decrease in tensile strength due to the heat treatment at the time of transfer was examined. As a result, it was confirmed that the content of the sulfate ion in the base paper for thermal transfer paper needs to be controlled to 0.6 mg/l or less. The content of the sulfate ion is preferably in the range of 0.1 to 0.6 mg/l, more preferably in the range of 0.2 to 0.6 mg/l. By controlling the content of the sulfate ion within the above range, it is possible to suppress a decrease in tensile strength after the heat treatment. Among them, the content of sulfate ions in the paper can be measured using an ion chromatograph.
對於硫酸鋁的含量可以作為硫酸離子的含量進行測量，也可以作為鋁含量進行測量。在此情況下，熱轉印紙用原紙中的鋁含量優選為0.09質量%以下，更優選為0.03～0.09質量%。The content of aluminum sulfate can be measured as the content of sulfate ions or as the aluminum content. In this case, the aluminum content in the base paper for thermal transfer paper is preferably 0.09% by mass or less, and more preferably 0.03 to 0.09% by mass.
本實施方式的熱轉印紙用原紙在與基材緊貼時，將被賦予水性糊，因此優選具有優異的濕潤拉伸強度。此外，考慮到從基材剝離熱轉印紙時的作業性，優選具有優異的加熱處理後的濕潤拉伸強度。本案諸位發明人對用於提高濕潤時的拉伸強度的配方進行了研究。一直以來作為紙力增強劑廣泛使用的陽離子化澱粉中，提高濕潤時的拉伸強度的效果不足。因此，對能夠取代陽離子化澱粉的濕潤紙力增強劑進行了研究。其結果發現，作為濕潤紙力增強劑，優選為從聚醯胺多胺環氧氯丙烷系樹脂（PAE）、脲醛系樹脂和三聚氰胺甲醛系樹脂中選出的一種以上。The base paper for thermal transfer paper of the present embodiment is preferably provided with an aqueous paste when it is in close contact with the substrate, and therefore preferably has excellent wet tensile strength. Further, in consideration of workability in peeling off the thermal transfer paper from the substrate, it is preferred to have excellent wet tensile strength after heat treatment. The inventors of this case studied the formulation for improving the tensile strength at the time of wetting. Among the cationized starch which has been widely used as a paper strength enhancer, the effect of improving the tensile strength at the time of wetting is insufficient. Therefore, a wet paper strength enhancer capable of replacing cationized starch has been studied. As a result, the wet paper strength enhancer is preferably one or more selected from the group consisting of polyamine polyamine epichlorohydrin resin (PAE), urea resin, and melamine formaldehyde resin.
即，將陽離子化澱粉的含量控制在0.01質量%以下，濕潤紙力增強劑的含量控制在0.10～0.35質量%。濕潤紙力增強劑的含量優選為0.10質量%以上，更優選為0.20質量%以上。如果在上述範圍內，則能夠賦予可用作熱轉印紙用原紙的濕潤拉伸強度。另外，濕潤紙力增強劑的含量優選為0.35質量%以下。這是因為，如果濕潤紙力增強劑的含量過多，則無法完全固著在紙漿中，會造成使用過量的藥品，從而可能會造成污染抄紙機體系內等不利影響。其中，陽離子化澱粉和濕潤紙力增強劑的含量是指，相對於紙漿成分總質量的比率。That is, the content of the cationized starch is controlled to 0.01% by mass or less, and the content of the wet paper strength enhancer is controlled to be 0.10 to 0.35% by mass. The content of the wet paper strength enhancer is preferably 0.10% by mass or more, and more preferably 0.20% by mass or more. If it is in the above range, the wet tensile strength which can be used as the base paper for thermal transfer paper can be imparted. Further, the content of the wet paper strength enhancer is preferably 0.35% by mass or less. This is because if the content of the wet paper strength enhancer is too large, it cannot be completely fixed in the pulp, which may result in the use of an excessive amount of the drug, which may cause adverse effects such as contamination in the paper machine system. Here, the content of the cationized starch and the wet paper strength enhancer means the ratio with respect to the total mass of the pulp component.
作為乾燥紙力增強劑可使用公知的產品，例如，能夠使用聚丙烯醯胺系紙力增強劑（PAM）、澱粉等。作為PAM、澱粉等，無特殊限定，可使用陽離子性、陰離子性、兩性中的任意物質。但是，如果從濕潤紙力增強劑的固著性考慮，則優選陰離子性或兩性的乾燥紙力增強劑。As the dry paper strength enhancer, a known product can be used. For example, a polypropylene amide-based paper strength enhancer (PAM), starch, or the like can be used. The PAM, the starch, and the like are not particularly limited, and any of cationic, anionic, and amphoteric can be used. However, an anionic or amphoteric dry paper strength enhancer is preferred in view of the adhesion of the wet paper strength enhancer.
作為上漿劑可使用公知的產品。在上漿劑中，優選含有從松香系上漿劑、烯基琥珀酸酐（ASA）系上漿劑、陽離子聚合物系上漿劑以及烷基烯酮二聚體（AKD）系上漿劑中選出的一種以上。尤其是，由於減少了酸性硫酸鋁的添加量，因此從上漿表現性考慮，相較於酸性松香系上漿劑優選中性松香系上漿劑。對於上漿劑的含量，無特殊限定，在熱轉印紙用原紙中優選包含0.05～0.5質量%，但從提高耐水性和作業性的觀點出發，更優選包含0.10～0.5質量%。As the sizing agent, a known product can be used. In the sizing agent, it is preferably contained in a rosin-based sizing agent, an alkenyl succinic anhydride (ASA)-based sizing agent, a cationic polymer-based sizing agent, and an alkyl ketene dimer (AKD)-based sizing agent. More than one selected. In particular, since the addition amount of the acidic aluminum sulfate is reduced, the neutral rosin-based sizing agent is preferable to the acidic rosin-based sizing agent from the viewpoint of sizing performance. The content of the sizing agent is not particularly limited, and is preferably 0.05 to 0.5% by mass in the base paper for thermal transfer paper. From the viewpoint of improving water resistance and workability, it is more preferably contained in an amount of 0.10 to 0.5% by mass.
此外，作為用於達到預期的功能的製紙用添加劑，可以在紙料中適當混合碳酸鈣、滑石、黏土、高嶺土高岭土高岭土 等填料、成品率提高劑、濾水改善劑等公知的藥劑。Further, as a papermaking additive for achieving a desired function, a known agent such as a filler such as calcium carbonate, talc, clay, kaolin kaolin clay , a yield improving agent, or a water filter improving agent may be appropriately mixed in the paper stock.
以上述方式調整的紙料，可通過公知的方法抄造成單光紙。此時，抄紙機的種類無特殊限定。一般而言，為了提高單面的平滑性，可通過具有楊克式乾燥機的抄紙機進行抄造。因此，熱轉印紙用原紙的單面是平滑的。另外，根據需求也可以在表面上實施設置賦予印刷適用性的塗布層、軋光加工等後處理。The paper stock adjusted in the above manner can be copied into a single glossy paper by a known method. At this time, the type of the paper machine is not particularly limited. In general, in order to improve the smoothness of one side, papermaking can be carried out by a paper machine having a Yankee dryer. Therefore, the single side of the base paper for thermal transfer paper is smooth. Further, a post-treatment such as a coating layer for applying printability and calender processing may be applied to the surface as required.
熱轉印紙用原紙的平滑面的王研式平滑度(Oken type smoothness)優選為500秒以上，更優選為600秒以上，進一步優選為700秒以上。如果在上述範圍內，則熱轉印紙用原紙的平滑面的印刷性將變得良好。即，在實施凹版印刷等時，增加了對輥的緊貼性，即使不設置如吸墨塗層的塗布層，也能夠實現高品質的印刷。另外，王研式平滑度優選為1200秒以下。如果平滑度過高，則抄造時控制水分的困難、抄造速度的降低的需求等就會產生，因此有可能會導致作業性、生產率等的降低。需要說明的是，王研式平滑度是根據JIS P 8155：2010所規定的王研法來測量的。The Oken type smoothness of the smooth surface of the base paper for thermal transfer paper is preferably 500 seconds or longer, more preferably 600 seconds or longer, and still more preferably 700 seconds or longer. If it is in the above range, the printability of the smooth surface of the base paper for thermal transfer paper will become good. That is, when gravure printing or the like is performed, the adhesion to the roller is increased, and high-quality printing can be realized without providing a coating layer such as an ink-absorbing coating. Further, the Wang Institute-style smoothness is preferably 1200 seconds or less. When the smoothness is too high, the difficulty in controlling moisture during the papermaking and the need to reduce the speed of papermaking occur, which may cause deterioration in workability, productivity, and the like. It should be noted that the Wang Institute-style smoothness is measured according to the Wang Yan method specified in JIS P 8155:2010.
熱轉印紙用原紙的上漿性的可勃吸水度（Cobb吸水度）優選為20g／m2 以下，更優選為15g／m2 以下。如果可勃吸水度超過20g／m2 ，則在使用水性糊將熱轉印紙緊貼在基材上時，由於紙張的強度降低，使得在切斷作業中的作業性降低。為了使可勃吸水度控制在20g／m2 以下，可通過在紙料中適量添加前述上漿劑的方法來達到目的。需要說明的是，可勃吸水度是根據JIS P 8140：1998所規定的30g／m2 法來測量的。The sizing property of the base paper for thermal transfer paper (Cobb water absorption) is preferably 20 g/m 2 or less, and more preferably 15 g/m 2 or less. When the water absorption is more than 20 g/m 2 , when the thermal transfer paper is adhered to the substrate by using the aqueous paste, the workability in the cutting operation is lowered due to the decrease in the strength of the paper. In order to control the Bob water absorption to 20 g/m 2 or less, the object can be attained by adding an appropriate amount of the above sizing agent to the paper stock. It should be noted that the absorbability is measured according to the 30 g/m 2 method prescribed in JIS P 8140:1998.
對於熱轉印紙用原紙，從使用時的經濟性的觀點出發，為了防止印刷時過度地吸收墨，優選具有適度的耐油性。即，熱轉印紙用原紙的吸油度優選為400秒以上，更優選為450秒以上。吸油度是依據日本製漿造紙工業協會編號為67：2000（JAPAN TAPPI No.67：2000）來測量的。如果吸油度的時間長，則表示吸油困難，即耐油性優異。如果低於400秒，則熱轉印紙用原紙容易過度地吸收墨，因此在印刷圖像時墨的使用量將增多，從經濟性角度出發並不理想。通過改變上述上漿劑的配方和密度等，可以控制熱轉印紙用原紙的吸油度。The base paper for thermal transfer paper preferably has moderate oil resistance from the viewpoint of economical use at the time of use, in order to prevent excessive absorption of ink during printing. That is, the oil absorption of the base paper for thermal transfer paper is preferably 400 seconds or longer, and more preferably 450 seconds or longer. The oil absorption is measured according to the Japan Pulp and Paper Industry Association No. 67:2000 (JAPAN TAPPI No. 67:2000). If the oil absorption time is long, it means that the oil absorption is difficult, that is, the oil resistance is excellent. If it is less than 400 seconds, the base paper for thermal transfer paper tends to excessively absorb the ink, so that the amount of ink used in printing an image is increased, which is not preferable from the viewpoint of economy. The oil absorption of the base paper for thermal transfer paper can be controlled by changing the formulation, density, and the like of the above sizing agent.
熱轉印紙用原紙的基重為20～50g／m2 ，優選為25～35g／m2 ，更優選為27～32g／m2 。當基重大於50g／m2 時，在作為熱轉印紙而使用的情況下，由於紙張過重，會導致向基材壓合以及從基材剝離時的作業性降低。另外，當基重小於20g／m2 時，難以保證作為熱轉印紙所需的強度。The base paper for thermal transfer paper has a basis weight of 20 to 50 g/m 2 , preferably 25 to 35 g/m 2 , and more preferably 27 to 32 g/m 2 . When the base is more than 50 g/m 2 , when it is used as a thermal transfer paper, the paper is too heavy, resulting in a decrease in workability when the substrate is pressed and peeled off from the substrate. In addition, when the basis weight is less than 20 g/m 2 , it is difficult to secure the strength required as a thermal transfer paper.
熱轉印紙用原紙的密度為0.75～0.85g／cm3 ，優選為0.78～0.82g／cm3 。當密度大於0.85g／cm3 時，需要使紙的厚度極薄，從而降低了生產率。另外，當密度小於0.75g／cm3 時，難以保證作為熱轉印紙所需的強度。而且，隨著纖維間的空隙變大而吸油性也將提升，因此難以達到優選的吸油度。The base paper for thermal transfer paper has a density of 0.75 to 0.85 g/cm 3 , preferably 0.78 to 0.82 g/cm 3 . When the density is more than 0.85 g/cm 3 , it is necessary to make the thickness of the paper extremely thin, thereby reducing the productivity. In addition, when the density is less than 0.75 g/cm 3 , it is difficult to secure the strength required as the thermal transfer paper. Further, as the gap between the fibers becomes larger, the oil absorption property also increases, so that it is difficult to achieve a preferable oil absorption.
熱轉印紙用原紙的調濕時的拉伸強度優選為2.0kN／m以上，更優選為2.4kN／m以上。The tensile strength at the time of humidity control of the base paper for thermal transfer paper is preferably 2.0 kN/m or more, and more preferably 2.4 kN/m or more.
對熱轉印紙用原紙以220℃加熱處理25分鐘後的拉伸強度優選為2.0kN／m以上，進一步優選為2.3kN／m以上。以220℃加熱處理25分鐘的條件是作為進行熱轉印時的代表性的加熱處理條件來選擇的。The tensile strength after heat treatment of the base paper for thermal transfer paper at 220 ° C for 25 minutes is preferably 2.0 kN / m or more, and more preferably 2.3 kN / m or more. The conditions of heat treatment at 220 ° C for 25 minutes were selected as representative heat treatment conditions at the time of thermal transfer.
熱轉印紙用原紙的以220℃加熱處理25分鐘後的拉伸強度降低率（％）可通過100×［（調濕時的拉伸強度）－（以220℃加熱處理25分鐘後的拉伸強度）］／（調濕時的拉伸強度）來求得。加熱處理後的拉伸強度降低率優選為20％以下，更優選為10％以下，進一步優選為5％以下。如果加熱處理後的拉伸強度降低率超過20％，則在熱轉印之後從基材剝離熱轉印紙時會造成熱轉印紙破損，從而作業性會降低。The tensile strength reduction rate (%) of the base paper for thermal transfer paper after heat treatment at 220 ° C for 25 minutes can pass 100 × [(tensile strength at the time of humidity control) - (stretching after heat treatment at 220 ° C for 25 minutes) Strength)] / (tensile strength at the time of humidity control) was obtained. The tensile strength reduction rate after the heat treatment is preferably 20% or less, more preferably 10% or less, and still more preferably 5% or less. When the tensile strength reduction rate after the heat treatment exceeds 20%, the thermal transfer paper is broken when the thermal transfer paper is peeled off from the substrate after the thermal transfer, and workability is lowered.
對於加熱處理後的拉伸強度，可通過將紙張中的硫酸離子含量控制在0.6mg／l以下，更優選為0.1～0.6mg／l範圍內，從而抑制加熱處理後的拉伸強度的降低。另外，為了保證加熱處理後的拉伸強度，也可以採用預先提高加熱處理前的拉伸強度的方法。但是，在此情況下，需要採取增加紙力增強劑等的量或加大基重等的對策，因此從成本和作業性的方面考慮並不都是理想的。The tensile strength after the heat treatment can be controlled by controlling the sulfate ion content in the paper to be 0.6 mg/l or less, more preferably 0.1 to 0.6 mg/l, thereby suppressing the decrease in tensile strength after the heat treatment. Further, in order to secure the tensile strength after the heat treatment, a method of increasing the tensile strength before the heat treatment may be employed. However, in this case, it is necessary to take measures to increase the amount of the paper strength enhancer or the like, or to increase the basis weight. Therefore, it is not always preferable from the viewpoint of cost and workability.
熱轉印紙用原紙以220℃加熱處理25分鐘後的濕潤拉伸強度優選為0.80kN／m以上，更優選為0.83kN／m以上。為了使加熱處理後的濕潤拉伸強度控制在0.80kN／m以上，可以在紙料中適量添加前述的濕潤紙力劑。當低於上述濕潤拉伸強度時，存在有切斷使用水性糊進行轉印時的多餘的熱轉印紙的作業的作業性降低的顧慮。另外，轉印後從基材剝離熱轉印紙的作業在高溫多濕環境下進行，但此時熱轉印紙易破損，因此存在有作業性降低的顧慮。The wet tensile strength of the base paper for thermal transfer paper after heat treatment at 220 ° C for 25 minutes is preferably 0.80 kN / m or more, and more preferably 0.83 kN / m or more. In order to control the wet tensile strength after the heat treatment to 0.80 kN/m or more, the above-mentioned wet paper strength agent may be appropriately added to the paper stock. When it is less than the above-mentioned wet tensile strength, there is a concern that the workability of cutting off the excess thermal transfer paper at the time of transfer using the aqueous paste may be lowered. Further, the operation of peeling the thermal transfer paper from the substrate after the transfer is performed in a high-temperature and high-humidity environment. However, at this time, the thermal transfer paper is easily broken, and there is a concern that workability is lowered.
需要說明的是，拉伸強度是依據JIS P 8113：2006來測量的。另外，調濕時的拉伸強度是在根據JIS P 8111：1998的調濕環境（溫度23℃、濕度50％RH）下放置1天以上之後測量的拉伸強度。另外，加熱處理後的拉伸強度是使用恒溫乾燥機在220℃的環境下放置25分鐘，進一步在調濕環境下放置15分鐘之後測量的結果。It should be noted that the tensile strength is measured in accordance with JIS P 8113:2006. Further, the tensile strength at the time of humidity control is a tensile strength measured after being left for one day or more in a humidity-conditioning environment (temperature: 23 ° C, humidity: 50% RH) in accordance with JIS P 8111:1998. Further, the tensile strength after the heat treatment was measured by using a constant temperature dryer under an environment of 220 ° C for 25 minutes, and further placed in a humidity-conditioning environment for 15 minutes.
需要說明的是，加熱處理後的濕潤拉伸強度是使用恒溫乾燥機在220℃的環境下放置25分鐘後，進一步在調濕環境下放置15分鐘後，依據作為JIS P 8135：1998的一般法所規定的方法來測量的。It should be noted that the wet tensile strength after the heat treatment is placed in a 220 ° C environment for 25 minutes using a constant temperature dryer, and further placed in a humidity control environment for 15 minutes, according to the general method of JIS P 8135:1998. The method specified is measured.
其中，上述拉伸強度、加熱處理後的拉伸強度、加熱處理後的濕潤拉伸強度在任何情況下均原則性地沿MD方向（抄紙機的流動方向）進行測量。其中，當不明確是否為MD方向時，每隔22.5度的角度測量一次拉伸強度，並將表示最強的拉伸強度的方向作為MD方向。Here, the tensile strength, the tensile strength after the heat treatment, and the wet tensile strength after the heat treatment are in principle measured in the MD direction (the flow direction of the paper machine). Here, when it is not clear whether or not it is the MD direction, the tensile strength is measured once every 22.5 degrees, and the direction indicating the strongest tensile strength is taken as the MD direction.
對於構成熱轉印紙的墨層的墨和黏合劑樹脂，只要具有如上所述能夠轉印至基材（被轉印材料）的性能，則無特殊限定。可以適當選擇公知的墨和黏合劑樹脂來使用。作為墨所使用的顏料、染料，可根據需求適當選擇昇華性或非昇華性的顏料、染料來使用。作為黏合劑樹脂，可根據需求選擇熱熔樹脂等熱塑性樹脂或熱固性樹脂等來使用。 實施例The ink and the binder resin constituting the ink layer of the thermal transfer paper are not particularly limited as long as they have the property of being able to be transferred to the substrate (transferred material) as described above. A well-known ink and binder resin can be appropriately selected and used. As the pigment or dye used for the ink, a sublimation or non-sublimation pigment or dye can be appropriately selected according to the demand. As the binder resin, a thermoplastic resin such as a hot melt resin or a thermosetting resin can be used as needed. Example
以下示出實施例和比較例。以下實施例中所示的材料、使用量、比例、處理內容、處理順序等，在不脫離本發明宗旨的範圍內可以適當的進行變更。因此，本發明的範圍不應根據以下所示的具體示例而限制性地解釋。Examples and comparative examples are shown below. The materials, the amounts, the ratios, the processing contents, the processing procedures, and the like shown in the following examples can be appropriately changed without departing from the spirit and scope of the invention. Therefore, the scope of the invention should not be construed as being limited by the specific examples shown below.
（實施例1） 使用雙盤磨漿機（以下稱為DDR）將漂白針葉樹牛皮紙漿（NKP）和漂白闊葉樹牛皮紙漿（LKP）分別進行打漿，直至打漿度變為360ml。將打漿後的NKP15質量%以及打漿後的LKP85質量%分別在漿池中進行混合。接下來，分別添加硫酸鋁和聚醯胺多胺環氧氯丙烷系樹脂（PAE系濕潤紙力增強劑），使得硫酸鋁和聚醯胺多胺環氧氯丙烷系樹脂的含量相對於紙漿成分分別為0.6質量%、0.16質量%。接下來，添加聚丙烯醯胺系紙力增強劑（PAM系紙力增強劑），使得聚丙烯醯胺系紙力增強劑的含量相對於紙漿成分為0.27質量%，進一步地，添加中性松香系上漿劑，使得中性松香系上漿劑的含量相對於紙漿成分為0.35質量%，從而調製紙料。採用調製的紙料，使用具有楊克式乾燥機的抄紙機進行抄紙，從而獲得基重為30g／m2 的熱轉印紙用原紙。(Example 1) Bleached conifer kraft pulp (NKP) and bleached hardwood kraft pulp (LKP) were separately beaten using a double disc refiner (hereinafter referred to as DDR) until the degree of beating became 360 ml. The NKP 15% by mass after beating and the LKP 85% by mass after beating were separately mixed in the slurry tank. Next, aluminum sulfate and polyamine polyamine epichlorohydrin resin (PAE wet paper strength enhancer) are separately added to make the content of aluminum sulfate and polyamine polyamine epichlorohydrin resin relative to the pulp component. They were 0.6% by mass and 0.16% by mass, respectively. Next, a polypropylene amide-based paper strength enhancer (PAM-based paper strength enhancer) was added so that the content of the polypropylene amide-based paper strength enhancer was 0.27% by mass based on the pulp component, and further, neutral rosin was added. The sizing agent was prepared so that the content of the neutral rosin-based sizing agent was 0.35% by mass based on the pulp component, thereby modulating the paper stock. Using a prepared paper stock, papermaking was carried out using a paper machine having a Yankee dryer to obtain a base paper for thermal transfer paper having a basis weight of 30 g/m 2 .
（實施例2） 以與實施例1相同的方式混合紙漿後，分別添加硫酸鋁和PAE系濕潤紙力增強劑，使得硫酸鋁和PAE系濕潤紙力增強劑的含量相對於紙漿成分分別為0.6質量%、0.25質量%。接下來，添加PAM系紙力增強劑，使得PAM系紙力增強劑的含量相對於紙漿成分為0.27質量%，進一步地，添加中性松香系上漿劑，使得中性松香系上漿劑的含量相對於紙漿成分為0.5質量%，從而調製紙料。採用調製的紙料，使用具有楊克式乾燥機的抄紙機進行抄紙，從而獲得基重為31g／m2 的熱轉印紙用原紙。(Example 2) After mixing the pulp in the same manner as in Example 1, aluminum sulfate and PAE wet paper strength enhancer were respectively added so that the content of the aluminum sulfate and PAE wet paper strength enhancer was 0.6 with respect to the pulp composition, respectively. Mass%, 0.25 mass%. Next, a PAM-based paper strength enhancer is added so that the content of the PAM-based paper strength enhancer is 0.27% by mass relative to the pulp component, and further, a neutral rosin-based sizing agent is added to make the neutral rosin-based sizing agent The content was 0.5% by mass based on the pulp component, thereby modulating the paper stock. Using a prepared paper stock, papermaking was carried out using a paper machine having a Yankee dryer to obtain a base paper for thermal transfer paper having a basis weight of 31 g/m 2 .
（比較例1） 以與實施例1相同的方式混合紙漿後，添加硫酸鋁，使得硫酸鋁的含量相對於紙漿成分為1.2質量%。接下來，添加陽離子化澱粉，使得陽離子化澱粉的含量相對於紙漿成分為0.4質量%，接下來，添加PAM系紙力增強劑，使得PAM系紙力增強劑的含量相對於紙漿成分為0.27質量%，進一步地，添加酸性松香系上漿劑，使得酸性松香系上漿劑的含量相對於紙漿成分為0.27質量%，從而調製紙料。採用調製的紙料，使用具有楊克式乾燥機的抄紙機進行抄紙，從而獲得基重為31g／m2 的熱轉印紙用原紙。(Comparative Example 1) After the pulp was mixed in the same manner as in Example 1, aluminum sulfate was added so that the content of aluminum sulfate was 1.2% by mass based on the pulp component. Next, the cationized starch was added so that the content of the cationized starch was 0.4% by mass relative to the pulp component, and then, the PAM-based paper strength enhancer was added so that the content of the PAM-based paper strength enhancer was 0.27 by mass relative to the pulp component. Further, an acidic rosin-based sizing agent was added so that the content of the acidic rosin-based sizing agent was 0.27% by mass based on the pulp component, thereby modulating the paper stock. Using a prepared paper stock, papermaking was carried out using a paper machine having a Yankee dryer to obtain a base paper for thermal transfer paper having a basis weight of 31 g/m 2 .
（實施例3） 以與實施例1相同的方式混合紙漿後，分別添加硫酸鋁和PAE系濕潤紙力增強劑，使得硫酸鋁和PAE系濕潤紙力增強劑的含量相對於紙漿成分分別為0.6質量%、0.25質量%。接下來，添加PAM系紙力增強劑，使得PAM系紙力增強劑的含量相對於紙漿成分為0.27質量%，進一步地，添加中性松香系上漿劑，使得中性松香系上漿劑的含量相對於紙漿成分為0.05質量%，從而調製紙料。採用調製的紙料，使用具有楊克式乾燥機的抄紙機進行抄紙，從而獲得基重為31g／m2 的熱轉印紙用原紙。(Example 3) After mixing the pulp in the same manner as in Example 1, aluminum sulfate and PAE wet paper strength enhancer were respectively added so that the content of the aluminum sulfate and PAE wet paper strength enhancer was 0.6 with respect to the pulp composition, respectively. Mass%, 0.25 mass%. Next, a PAM-based paper strength enhancer is added so that the content of the PAM-based paper strength enhancer is 0.27% by mass relative to the pulp component, and further, a neutral rosin-based sizing agent is added to make the neutral rosin-based sizing agent The content was 0.05% by mass based on the pulp component, thereby modulating the paper stock. Using a prepared paper stock, papermaking was carried out using a paper machine having a Yankee dryer to obtain a base paper for thermal transfer paper having a basis weight of 31 g/m 2 .
（實施例4） 以與實施例1相同的方式添加紙漿和添加藥劑，從而調製紙料。採用調製的紙料，使用具有楊克式乾燥機的抄紙機進行抄紙，從而獲得基重為41g／m2 的熱轉印紙用原紙。(Example 4) A paper stock was prepared by adding pulp and adding a drug in the same manner as in Example 1. Using a prepared paper stock, papermaking was carried out using a paper machine having a Yankee dryer to obtain a base paper for thermal transfer paper having a basis weight of 41 g/m 2 .
（實施例5） 使用DDR將NKP和LKP分別進行打漿，直至打漿度變為400ml。將打漿後的NKP20質量%以及打漿後的LKP80質量%分別在漿池中進行混合。接下來，以與實施例1相同的方式添加藥劑並調整紙料。使用調整後的紙料，獲得基重為30g／m2 的熱轉印紙用原紙。(Example 5) NKP and LKP were separately beaten using DDR until the degree of beating became 400 ml. The NKP 20% by mass after beating and the LKP 80% by mass after beating were separately mixed in the slurry tank. Next, the drug was added and the paper stock was adjusted in the same manner as in Example 1. Using the adjusted stock, a base paper for thermal transfer paper having a basis weight of 30 g/m 2 was obtained.
（比較例2） 使用DDR將NKP和LKP分別進行打漿，直至打漿度變為450ml、430ml。將打漿後的NKP和LKP以與實施例1相同的比例進行混合。接下來，以與實施例1相同的方式添加藥劑並調整紙料。使用調整後的紙料，獲得基重為30g／m2 的熱轉印紙用原紙。(Comparative Example 2) NKP and LKP were separately beaten with DDR until the degree of beating became 450 ml and 430 ml. The beaten NKP and LKP were mixed in the same ratio as in Example 1. Next, the drug was added and the paper stock was adjusted in the same manner as in Example 1. Using the adjusted stock, a base paper for thermal transfer paper having a basis weight of 30 g/m 2 was obtained.
（比較例3） 市場上購入的實際被使用的日本國內其他公司的產品。(Comparative Example 3) Products of other companies in Japan that were actually purchased in the market.
（比較例4） 市場上購入的實際被使用的日本國外其他公司的產品。(Comparative Example 4) Products of other companies in Japan that were actually purchased in the market.
對所獲得的實施例和比較例的熱轉印紙用原紙，測量了基重、密度、硫酸離子的含量、平滑面的王研式平滑度、拉伸強度、加熱處理後的拉伸強度、加熱處理引起的拉伸強度降低率、加熱處理後的濕潤拉伸強度、可勃吸水度、吸油度。另外，為了瞭解作為熱轉印紙用原紙的適用性，評估了印刷性、熱轉印性、墨吸收量、耐水性以及作業性。 各項的評估方法如下所示。With respect to the obtained base paper for thermal transfer paper of the examples and the comparative examples, the basis weight, the density, the content of the sulfate ion, the smoothness of the smooth surface, the tensile strength, the tensile strength after the heat treatment, and the heating were measured. The rate of decrease in tensile strength caused by the treatment, the wet tensile strength after the heat treatment, the absorbability of the water, and the oil absorption. In addition, in order to understand the applicability as a base paper for thermal transfer paper, printability, thermal transfer property, ink absorption amount, water resistance, and workability were evaluated. The evaluation methods for each item are as follows.
＜基重＞ 依據JIS P 8124：2011進行了測量。使用可測量至小數點後4位數的電子秤測量了重量，並計算出了基重。<Base weight> Measurement was carried out in accordance with JIS P 8124:2011. The weight was measured using an electronic scale measuring to four digits after the decimal point, and the basis weight was calculated.
＜密度＞ 依據JIS P 8118：1998測量了密度。<Density> The density was measured in accordance with JIS P 8118:1998.
＜硫酸離子的含量＞ 將2g樣品切成適當的大小，在100cc離子交換水中煮一小時後，使用孔徑為0.45μm的過濾器（研華科技公司（ADVANTEC）製造，注射器過濾器25HP045AN）進行了過濾處理。之後，使用離子色譜儀（戴安公司（Dionex Corporation）製造，ICS2000）測量了硫酸離子量。<Content of Sulfate Ion> 2 g of the sample was cut into an appropriate size, and after boiling for one hour in 100 cc of ion-exchanged water, it was filtered using a filter having a pore size of 0.45 μm (manufactured by ADVANTEC, syringe filter 25HP045AN). deal with. Thereafter, the amount of sulfate ions was measured using an ion chromatograph (manufactured by Dionex Corporation, ICS2000).
＜王研式平滑度＞ 依據JIS P 8155：2010所規定的方法，測量了平滑面的平滑度。作為測量機使用了王研式平滑度透氣性測試儀（日本旭精工公司製造）。<Wang Research Type Smoothness> The smoothness of the smooth surface was measured in accordance with the method specified in JIS P 8155:2010. As a measuring machine, a Wang Yan type smoothness gas permeability tester (manufactured by Asahi Seiko Co., Ltd.) was used.
＜拉伸強度＞ 依據JIS P 8113：2006所規定的方法，在JIS P 8111：1998所規定的調濕環境下測量了調濕後的MD方向的拉伸強度。作為測量機使用了臥式拉伸試驗機（路易公司（L & W公司）製造，CODE SE-064）。<Tensile Strength> According to the method specified in JIS P 8113:2006, the tensile strength in the MD direction after humidity control was measured in a humidity-conditioning environment prescribed in JIS P 8111:1998. A horizontal tensile tester (manufactured by L&W, CODE SE-064) was used as the measuring machine.
＜加熱處理後的拉伸強度＞ 使用恒溫乾燥機在220℃的環境下放置25分鐘之後，在JIS P 8111：1998所規定的調濕環境下進一步地放置15分鐘之後，依據JIS P 8113：2006所規定的方法，測量了MD方向的拉伸強度。作為測量機使用了臥式拉伸試驗機（路易公司（L&W公司）製造，CODE SE-064）。<Tensile strength after heat treatment> After standing for 25 minutes in an environment of 220 ° C using a constant temperature dryer, after further standing for 15 minutes in a humidity control environment prescribed in JIS P 8111:1998, according to JIS P 8113:2006 The tensile strength of the MD direction was measured by the prescribed method. A horizontal tensile tester (manufactured by L&W, CODE SE-064) was used as the measuring machine.
＜加熱處理後的濕潤拉伸強度＞ 使用恒溫乾燥機在220℃的環境下放置25分鐘之後，在JIS P 8111：1998所規定的調濕環境下進一步地放置15分鐘之後，依據作為JIS P 8135：1998的一般法所規定的方法，測量了MD方向的濕潤拉伸強度。作為測量機使用了立式拉伸試驗機（愛安德公司（A&D公司）製造，萬能材料試驗機（Tensilon））。<Heat tensile strength after heat treatment> After standing for 25 minutes in an environment of 220 ° C using a constant temperature dryer, after further standing for 15 minutes in a humidity control environment prescribed in JIS P 8111:1998, it is based on JIS P 8135. : The method specified in the general law of 1998 measures the wet tensile strength in the MD direction. As a measuring machine, a vertical tensile testing machine (manufactured by A&D Co., Ltd., Tensilon) was used.
＜可勃吸水度＞ 依據JIS P 8140：1998所規定的30秒法，使用可測量至小數點後4位數的電子秤進行了測量。<Bore Water Absorption> According to the 30-second method prescribed by JIS P 8140:1998, measurement was performed using an electronic scale that can be measured to four digits after the decimal point.
＜吸油度＞ 按照日本製漿造紙工業協會編號為67：2000（JAPAN TAPPI No.67：2000）進行了測量。作為測量機使用了編號114的吸油度試驗機(東洋精機公司製造)。<Oil absorption> Measurement was carried out in accordance with the Japan Pulp and Paper Industry Association No. 67:2000 (JAPAN TAPPI No. 67:2000). An oil absorption tester (manufactured by Toyo Seiki Co., Ltd.) No. 114 was used as the measuring machine.
＜印刷性＞ 在通過上述實施例和比較例所獲得的熱轉印紙用原紙的平滑面上，使用噴墨印刷機（日本御牧工程公司（MIMAKI ENGINEERING CO.,LTD）製造，JV5－320DS），並採用昇華墨（日本御牧工程公司製造，Sb52，墨濃度5％）進行了木紋圖案的印刷，並對印刷面進行了相對評估。 〇：進行了清晰地印刷。 △：存在色調稍微劣化的部分。 ×：掉色、模糊明顯。<Printability> An ink jet printer (manufactured by MIMAKI ENGINEERING CO., LTD., JV5-320DS) was used on the smooth surface of the base paper for thermal transfer paper obtained by the above Examples and Comparative Examples. The wood grain pattern was printed using Sublimation Ink (manufactured by Japan Yumu Engineering Co., Ltd., Sb52, ink concentration 5%), and the printed surface was relatively evaluated. 〇: It was printed clearly. △: There is a portion where the color tone is slightly deteriorated. ×: The color is faded and the blur is obvious.
＜熱轉印性＞ 從確認印刷性的實驗中獲得的熱轉印紙上切取10cm×10cm大小，將印刷面以與鋁板接觸的方式壓合，並使用小型熱壓機（東洋精機公司製造，MINI PRESS-10 MP－SNH）以5kN的負載在220℃下進行30秒的熱壓後，對所轉印的圖像的清晰度進行相對評估。 〇：進行了清晰地轉印。 △：存在色調稍微劣化的部分。 ×：色調淺、不清晰。<Thermal transfer property> The thermal transfer paper obtained from the experiment for confirming the printability was cut into a size of 10 cm × 10 cm, and the printed surface was pressed in contact with the aluminum plate, and a small hot press (manufactured by Toyo Seiki Co., Ltd., MINI) was used. PRESS-10 MP-SNH) After a 30 second hot press at 220 ° C under a load of 5 kN, the sharpness of the transferred image was relatively evaluated. 〇: A clear transfer was made. △: There is a portion where the color tone is slightly deteriorated. ×: The color is light and unclear.
＜墨吸收量＞ 從通過上述實施例和比較例所獲得的熱轉印紙用原紙上切取A4尺寸的大小，並在其平滑面上使用印刷性評估中所採用的墨實施棒塗布（使用繞線為0.3mm的線棒），直至含濕量成為30g／m2 。此時，對從背面觀察時的墨掉色量進行了相對比較。 〇：墨掉色不明顯。 △：能夠確認到少許墨掉色，但在實用等級內。 ×：墨掉色明顯。<Ink Absorption Amount> The size of the A4 size was cut out from the base paper for thermal transfer paper obtained by the above Examples and Comparative Examples, and bar coating was performed on the smooth surface thereof using the ink used in the evaluation of the printability (using a winding) It is a rod of 0.3 mm) until the moisture content becomes 30 g/m 2 . At this time, the amount of ink drop when viewed from the back side was relatively compared. 〇: The color of the ink is not obvious. △: It was confirmed that a little ink was faded, but it was within the practical level. ×: The ink fades significantly.
＜耐水性＞ 使用10cm×10cm的熱轉印紙用原紙，使用恒溫乾燥機在105℃的環境下放置15分鐘後，放入水中浸泡30秒。之後，使用切割器切斷浸泡水的紙張，從其切口進行耐水性的相對評估。 〇：可沒有問題地切斷。 △：切口稍微粗糙，但可以切斷。 ×：中途發生破損，無法切斷。<Water resistance> The base paper for thermal transfer paper of 10 cm × 10 cm was placed in an environment of 105 ° C for 15 minutes using a constant temperature dryer, and then immersed in water for 30 seconds. Thereafter, the paper soaked in water was cut using a cutter, and the relative evaluation of water resistance was performed from the slit. 〇: Can be cut off without problems. △: The slit is slightly rough, but it can be cut. ×: Damage occurred in the middle and could not be cut.
＜作業性＞ 將確認印刷性的實驗中獲得的120cm×70cm的熱轉印紙，使用水性糊貼附在100cm×50cm的鋁製基材上，使用熱壓機進行熱轉印後，對剝離時的作業性進行評估。 〇：能夠高效率作業。 △：作業性略微降低，但能夠作業。 ×：不能高效率作業。<Workability> The 120 cm × 70 cm thermal transfer paper obtained in the experiment for confirming the printability was attached to a 100 cm × 50 cm aluminum substrate using a water paste, and subjected to thermal transfer using a hot press. The workability is evaluated. 〇: It can work efficiently. △: Workability was slightly lowered, but work was possible. ×: It is not possible to work efficiently.
表1示出了實施例1～5以及比較例1～4的測量、評估結果。在特性評估中，當結果為〇和△時判定為合格。Table 1 shows the results of measurement and evaluation of Examples 1 to 5 and Comparative Examples 1 to 4. In the characteristic evaluation, when the results were 〇 and Δ, it was judged as pass.
表1
從表1可以看出，實施例1～5的熱轉印紙用原紙可以作為熱轉印紙合適地使用。另外，比較例1和比較例3的熱轉印紙用原紙中硫酸離子的含量高，並且由加熱處理所引起的拉伸強度降低率大，因此耐水性和作業性差。比較例4的熱轉印紙用原紙的平滑面的王研式平滑度低，因此印刷性差。比較例2的熱轉印用原紙的密度小，墨易被吸收，因此存在有印刷時的墨使用量變多的顧慮。As can be seen from Table 1, the base paper for thermal transfer paper of Examples 1 to 5 can be suitably used as a thermal transfer paper. Further, in the base paper for thermal transfer paper of Comparative Example 1 and Comparative Example 3, the content of sulfate ions was high, and the rate of decrease in tensile strength due to heat treatment was large, and thus water resistance and workability were inferior. The smooth surface of the base paper for thermal transfer paper of Comparative Example 4 has a low smoothness of the Wang Yan type, and thus the printability is poor. The base paper for thermal transfer of Comparative Example 2 has a small density, and the ink is easily absorbed. Therefore, there is a concern that the amount of ink used during printing increases.
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