JP2010188285A - Method of manufacturing recording medium - Google Patents
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Description
本発明は記録媒体の製造方法に関する。 The present invention relates to a method for manufacturing a recording medium.
連続的に搬送される帯状シートに塗布液を塗布した後に、乾燥機で乾燥させる工程は、例えば写真用フィルム、磁気記録媒体、インクジェット記録媒体と様々な記録媒体の製造方法で行われている。この乾燥工程は、製品の品質に関係する重要な工程である。特に、インクジェット記録用媒体等、連続的に搬送される帯状シートに無機微粒子を含有するインク受容層用塗布液を塗布する場合、インク受容層が過乾燥状態になると、記録媒体の塗布膜にひび割れが発生する可能性がある。 The step of applying the coating liquid to the continuously conveyed belt-like sheet and drying it with a drier is performed by, for example, photographic films, magnetic recording media, inkjet recording media, and various recording medium manufacturing methods. This drying process is an important process related to the quality of the product. In particular, when an ink receiving layer coating solution containing inorganic fine particles is applied to a continuously conveyed belt-like sheet such as an ink jet recording medium, the coating film of the recording medium is cracked when the ink receiving layer is overdried. May occur.
しかし、通常、乾燥開始時の乾燥機内の乾燥環境は不安定であり、塗布膜の乾燥が連続的に行われ、乾燥機内の乾燥環境が平衡状態（以後、定常乾燥時と記す）に達してから乾燥速度が安定化する。従って、乾燥開始時から定常乾燥時に移行するまでの乾燥速度の不安定な時に、製造される記録媒体の塗布膜の含水率を精度良く制御することが重要な課題となる。 However, the drying environment in the dryer is usually unstable at the start of drying, and the coating film is continuously dried, and the drying environment in the dryer reaches an equilibrium state (hereinafter referred to as steady drying). To stabilize the drying speed. Accordingly, it is an important issue to accurately control the moisture content of the coating film of the recording medium to be manufactured when the drying speed is unstable from the start of drying to the transition to steady drying.
記録媒体の塗布膜の含水率は膜面温度と相関があり、減率乾燥区間では乾燥が進むにつれて膜面温度が上昇する。従って、乾燥機内の膜面温度を制御することで塗布膜の乾燥状態、つまり含水率を制御することができる。 The moisture content of the coating film of the recording medium has a correlation with the film surface temperature, and the film surface temperature increases as the drying proceeds in the decreasing rate drying section. Therefore, the dry state of the coating film, that is, the moisture content can be controlled by controlling the film surface temperature in the dryer.
乾燥機による塗布膜の乾燥速度は、塗布膜面に当たる乾燥風の風量と温度、及び乾燥機内の絶対湿度の影響を大きく受け、乾燥風量、温度が一定の場合には乾燥機内の絶対湿度が低いほど乾燥速度は速くなる。乾燥開始時における乾燥機内の乾燥環境は、乾いた状態、即ち絶対湿度が低く乾燥速度が速い状態にある。そして、帯状シートが乾燥機に順次進入することにより塗布膜から水分が蒸発すると、乾燥機内の絶対湿度の上昇に伴って乾燥速度が遅くなり、次第に一定の乾燥速度となる。この一定の乾燥条件下で乾燥速度が安定した状態、すなわち製造される記録媒体の塗布膜の含水率が所望の値に安定した以後の状態を、定常乾燥状態とする。 The drying speed of the coating film by the dryer is greatly affected by the volume and temperature of the drying air hitting the coating film surface and the absolute humidity in the dryer, and the absolute humidity in the dryer is low when the drying air volume and temperature are constant. The faster the drying rate. The drying environment in the dryer at the start of drying is in a dry state, that is, a state where the absolute humidity is low and the drying speed is high. And if a strip | belt-shaped sheet | seat enters a dryer sequentially and a water | moisture content evaporates from a coating film, a drying rate will become slow with the raise of the absolute humidity in a dryer, and will become a constant drying rate gradually. A state in which the drying speed is stable under the constant drying condition, that is, a state after the moisture content of the coating film of the recording medium to be manufactured is stabilized to a desired value is defined as a steady drying state.
定常乾燥状態時に目標の含水率の塗布膜を得るように乾燥機内の乾燥風量を設定すると、乾燥開始時の乾燥速度が速くなり過ぎるので、乾燥開始時に乾燥された塗布膜の含水率が目標の含水率よりも低くなってしまう。即ち、製造開始時に製造される記録媒体の塗布膜の含水率が低くなり、製造開始時からせ製造終了時まで一定に保つことが困難となる。記録媒体がインクジェット記録媒体である場合、製品ロスばかりでなく、塗布膜がひび割れして塗布膜片が剥離してしまう可能性がある。 If the drying air volume in the dryer is set so as to obtain a coating film with a target moisture content in the steady drying state, the drying speed at the start of drying becomes too fast. It becomes lower than the moisture content. That is, the moisture content of the coating film of the recording medium produced at the start of production becomes low, and it becomes difficult to keep it constant from the start of production to the end of production. When the recording medium is an inkjet recording medium, not only the product loss but also the coating film may crack and the coating film piece may peel off.
これに対し、乾燥機内の乾燥温度と塗布膜の膜面温度との差を一定に維持するように、乾燥機に給気する乾燥風の温度を制御することで、乾燥開始時から定常乾燥時の乾燥速度を一定にする方法（特許文献１）がある。 On the other hand, by controlling the temperature of the drying air supplied to the dryer so that the difference between the drying temperature in the dryer and the film surface temperature of the coating film is kept constant, There exists a method (patent document 1) which makes the drying rate of this constant.
しかしながら、特許文献１のように乾燥風の温度を制御する方法では、高速応答性が求められる制御が必要である高速塗布時などの高速乾燥条件下では、温度制御の装置応答速度が遅く、制御が間に合わないことがある。即ち、乾燥機内の温度そのものを急速に変化させることは困難であり、特許文献１の方法は高速塗布には適用しにくいという課題がある。 However, in the method of controlling the temperature of the drying air as in Patent Document 1, the device response speed of the temperature control is slow under high-speed drying conditions such as during high-speed coating that requires control that requires high-speed response. May not be in time. That is, it is difficult to rapidly change the temperature in the dryer, and the method of Patent Document 1 is difficult to apply to high-speed coating.
従って、本発明は、高速塗布時などの高速乾燥条件下においても、製造開始時より製造終了時まで、一定の含水率の塗布膜を有する記録媒体の製造方法を提供することを目的とする。 Accordingly, an object of the present invention is to provide a method for producing a recording medium having a coating film having a constant moisture content from the start of production to the end of production even under high-speed drying conditions such as during high-speed application.
上記の目的は以下の本発明によって達成される。すなわち、本発明は、連続的に搬送される帯状シートに塗布液を塗布することによって塗布膜を形成する塗布膜形成工程と、該塗布膜が形成された帯状シートに乾燥機で乾燥風を当てることによって該塗布膜を乾燥させる乾燥工程と、を有する記録媒体の製造方法であって、製造される記録媒体の塗布膜の含水率が製造開始時より製造終了時まで一定となるように、該乾燥風の風量を制御することを特徴とする記録媒体の製造方法である。 The above object is achieved by the present invention described below. That is, in the present invention, a coating film forming step of forming a coating film by applying a coating liquid on a continuously conveyed belt-like sheet, and drying air is applied to the belt-like sheet on which the coating film is formed by a dryer. And a drying step of drying the coating film, wherein the moisture content of the coating film of the recording medium to be manufactured is constant from the start of manufacture to the end of manufacture. A method of manufacturing a recording medium, comprising controlling an air volume of dry air.
本発明の記録媒体の製造方法によれば、高速塗布時などの高速乾燥条件下においても、製造開始時から製造終了時まで、一定の含水率の塗布膜を有する記録媒体を得ることができる。 According to the recording medium manufacturing method of the present invention, it is possible to obtain a recording medium having a coating film having a constant moisture content from the start of manufacture to the end of manufacture even under high-speed drying conditions such as high-speed application.
本発明の記録媒体の製造方法の好ましい実施の形態について説明する。 A preferred embodiment of the recording medium manufacturing method of the present invention will be described.
本発明では、製造される記録媒体の塗布膜の含水率が製造開始時より製造終了時まで一定となるように、乾燥風の風量を制御する。尚、本発明において塗布膜の含水率が一定であるとは、製造開始時より製造終了時までの含水率が、目標値に対して８０％以上、１２０％以下である場合のことをいう。即ち、塗布膜の含水率の目標値が１０質量％の場合、製造開始時より製造終了時までの含水率が８質量％以上１２質量％以下であれば、一定である。 In the present invention, the amount of dry air is controlled so that the moisture content of the coating film of the recording medium to be manufactured is constant from the start of manufacture to the end of manufacture. In the present invention, the constant moisture content of the coating film means that the moisture content from the start of production to the end of production is 80% or more and 120% or less with respect to the target value. That is, when the target value of the moisture content of the coating film is 10% by mass, it is constant if the moisture content from the start of production to the end of production is 8% by mass to 12% by mass.
また、本発明において製造開始時とは、塗布膜を乾燥して最初に記録媒体が得られた時のことをいう。製造終了時とは、塗布膜を乾燥して最後に記録媒体が得られた時のことをいう。 In addition, in the present invention, the time of starting production means the time when the recording medium is first obtained by drying the coating film. The term “end of production” refers to the time when the recording film is finally obtained by drying the coating film.
一般に、高速で塗布するような場合は、１００℃以上の高温熱風で高速乾燥させる為、乾燥機内の湿度環境の変化が速くなる。従って、高速塗布時などの高速乾燥条件下では応答性の良い制御が必要であり、乾燥風の温度制御では応答が遅く制御が間に合わない。 In general, when the coating is performed at a high speed, the humidity environment in the dryer is rapidly changed because the coating is dried at a high speed by hot air of 100 ° C. or higher. Therefore, control with good responsiveness is required under high-speed drying conditions such as during high-speed application, and control of the drying air temperature is slow and the control is not in time.
しかし、風量制御は温度制御に比べ応答速度が速いため、高速塗布時などの高速乾燥条件下においても乾燥速度を精度良く一定に保つことが可能である。これにより、高速乾燥条件下においても、一定の含水率の塗布膜を得ることができる。 However, since the air volume control has a faster response speed than the temperature control, it is possible to keep the drying speed constant with high accuracy even under high-speed drying conditions such as during high-speed coating. Thereby, a coating film having a constant moisture content can be obtained even under high-speed drying conditions.
乾燥風の風量の制御は、予め求めた風量制御パターンに基づいて行うことが好ましい。予め、製造開始時と製造終了時で、塗布膜を目標の含水率に乾燥するための乾燥風量及び製造開始時から乾燥速度が変化し始めるまでの所要時間を求める。この結果から、製造開始時から製造終了時までの乾燥温度の風量制御パターンを作成する。この風量制御パターンに基づいて、乾燥機に給気する乾燥風の風量を制御する。 It is preferable to control the air volume of the dry air based on a previously obtained air volume control pattern. The amount of drying air for drying the coating film to the target moisture content at the start of manufacture and the end of manufacture and the required time from the start of manufacture until the drying speed starts to change are obtained in advance. From this result, an air volume control pattern of the drying temperature from the start of manufacture to the end of manufacture is created. Based on this air volume control pattern, the air volume of the drying air supplied to the dryer is controlled.
図１は本発明の塗布膜形成工程、乾燥工程の一例を示した図である。記録媒体の支持体としての帯状シート１１がリール１２から繰り出され、塗布装置１３にてその表面に塗布液が塗布される。そして、乾燥機１４を通過する間に乾燥された帯状シートが、リール１５に巻き取られるように構成されている。シートへの塗布液の塗布は、ブレードコーター、エアナイフコーター、ロールコーター、ブラシコーター、カーテンコーター、バーコーター、グラビアコーター、サイズプレスコーター等の塗布装置で行う。塗布は、一層でも多層に分けて行ってもよい。乾燥機１４は、複数の乾燥ゾーン（Ａ〜Ｅ）に分割されて各乾燥ゾーンごとに異なる乾燥条件に設定できる構造のものが好ましい。このような乾燥機であると、乾燥条件をより精密に設定できる。図１の例では、乾燥機１４を５つの乾燥ゾーンに分割している。各乾燥ゾーンを、シート搬送方向の上流側から１４Ａ（第１ゾーン）、１４Ｂ（第２ゾーン）、１４Ｃ（第３ゾーン）、１４Ｄ（第４ゾーン）、１４Ｅ（第５ゾーン）とする。 FIG. 1 is a view showing an example of a coating film forming process and a drying process of the present invention. A belt-like sheet 11 as a recording medium support is unwound from a reel 12, and a coating liquid is applied to the surface thereof by a coating device 13. Then, the belt-like sheet dried while passing through the dryer 14 is configured to be wound around the reel 15. The coating liquid is applied to the sheet by a coating device such as a blade coater, an air knife coater, a roll coater, a brush coater, a curtain coater, a bar coater, a gravure coater, or a size press coater. The application may be performed in a single layer or in multiple layers. The dryer 14 preferably has a structure that can be divided into a plurality of drying zones (A to E) and set to different drying conditions for each drying zone. With such a dryer, the drying conditions can be set more precisely. In the example of FIG. 1, the dryer 14 is divided into five drying zones. Let each drying zone be 14A (1st zone), 14B (2nd zone), 14C (3rd zone), 14D (4th zone), and 14E (5th zone) from the upstream of a sheet conveyance direction.
図２は、乾燥機１４の乾燥ゾーンの１つである１４Ａ（第１ゾーン）を拡大した図である。給気ファン２３によって給気ダクト２４に取り込まれた空気がヒーター２５によって加熱された後、圧力室２６に供給され、乾燥風として熱風ノズル２７から帯状シート２１に吹き付けられる。これにより、パスロール２２で支持された塗布液を塗布した帯状シート２１が、第１ゾーンの入口から出口にかけて搬送される間に熱風乾燥される。蒸発した水分を含んだ乾燥機内の空気は排気ファン２８によって排気ダクト２９に吸い出され、乾燥機外へ排出される。 FIG. 2 is an enlarged view of 14 </ b> A (first zone) which is one of the drying zones of the dryer 14. After the air taken in the air supply duct 24 by the air supply fan 23 is heated by the heater 25, it is supplied to the pressure chamber 26 and blown from the hot air nozzle 27 onto the belt-like sheet 21 as dry air. As a result, the belt-like sheet 21 coated with the coating liquid supported by the pass roll 22 is hot-air dried while being conveyed from the entrance to the exit of the first zone. The air in the dryer containing the evaporated water is sucked out into the exhaust duct 29 by the exhaust fan 28 and discharged outside the dryer.
図３は、第１ゾーンの風量制御パターンの一例である。乾燥開始時には第１ゾーン内は湿度が低く乾燥速度が速い雰囲気にあるので、乾燥風量は定常乾燥時よりも低く設定されている。そして、塗布膜（インク受容層）から水分が蒸発して第１ゾーン内の湿度が上がり乾燥速度が低下し始めるのにあわせ、徐々に定常乾燥時の乾燥風量まで上げていく風量制御パターンである。 FIG. 3 is an example of the air volume control pattern of the first zone. At the start of drying, the first zone is in an atmosphere where the humidity is low and the drying speed is high, so the amount of drying air is set lower than that during steady drying. Then, as the moisture evaporates from the coating film (ink receiving layer) and the humidity in the first zone increases and the drying speed begins to decrease, the air volume control pattern gradually increases to the drying air volume at the time of steady drying. .
図１の１４Ａ（第１ゾーン）〜１４Ｅ（第５ゾーン）の塗布装置１３からの距離はそれぞれ異なるため、各ゾーンにおける塗布開始から乾燥速度が変化するまでの時間、即ち塗布開始から乾燥開始までの時間もそれぞれ異なる。従って、各ゾーンに合わせた風量制御パターンを作成する。例えば、第１ゾーンでの塗布開始から乾燥開始までの時間を８秒、各乾燥ゾーンのシート通過時間を１０秒とした場合で説明する。この場合、帯状シートへの塗布開始から、第２ゾーン１４Ｂでの乾燥開始までの時間は８秒に１０秒を合計した１８秒となる。同様に、第３、第４、第５ゾーンではそれぞれ２８秒、３８秒、４８秒になる。 Since the distances from the coating device 13 in 14A (first zone) to 14E (fifth zone) in FIG. 1 are different from each other, the time from the start of coating to the drying speed in each zone, that is, from the start of coating to the start of drying. The times are different. Therefore, an air volume control pattern adapted to each zone is created. For example, the case where the time from the start of application to the start of drying in the first zone is 8 seconds and the sheet passing time in each drying zone is 10 seconds will be described. In this case, the time from the start of application to the belt-like sheet to the start of drying in the second zone 14B is 18 seconds, which is 8 seconds plus 10 seconds. Similarly, the third, fourth, and fifth zones are 28 seconds, 38 seconds, and 48 seconds, respectively.
そして、第１ゾーンから第５ゾーンの各乾燥ゾーンでは、作成した風量制御パターンに基づいて、乾燥風の風量を制御する。即ち、各乾燥ゾーン１４Ａ〜１４Ｅの給気ファンの回転速度を風量制御パターンを達成するためのプログラムとタイマー機構で制御する。 In each drying zone from the first zone to the fifth zone, the air volume of the drying air is controlled based on the created air volume control pattern. That is, the rotation speed of the air supply fan in each of the drying zones 14A to 14E is controlled by a program and a timer mechanism for achieving the air volume control pattern.
このように、製造開始時より製造終了時までの乾燥速度の違いに応じた乾燥温度の風量制御パターンを予め作成し、この風量制御パターンに基づいて乾燥風の風量を変化させれば、リアルタイムな制御を行うことができる。これにより、製造開始時から製造終了時までの乾燥速度を常に一定に保つことができる。従って、製造される記録媒体の塗布膜の含水率は、乾燥開始後すぐに製造した時から、最後の乾燥が終了した製造終了時まで、常に一定とすることができる。 Thus, if an air volume control pattern with a drying temperature corresponding to the difference in drying speed from the start of production to the end of production is created in advance and the air volume of the drying air is changed based on this air volume control pattern, real-time Control can be performed. Thereby, the drying speed from the start of manufacture to the end of manufacture can always be kept constant. Therefore, the moisture content of the coating film of the recording medium to be manufactured can be always constant from the time when it is manufactured immediately after the start of drying until the end of manufacturing when the last drying is completed.
また、装置応答速度の速い風量制御により、高速塗布時などの高速乾燥条件下においても精度良く含水率を制御することが可能となる。 In addition, the air content control with a fast device response speed makes it possible to accurately control the moisture content even under high-speed drying conditions such as during high-speed application.
尚、本発明の記録媒体の製造方法は、インク受容層を有するインクジェット記録媒体に適用することが、本発明の効果をより良好に発現可能であるため好ましい。 Note that the method for producing a recording medium of the present invention is preferably applied to an ink jet recording medium having an ink receiving layer because the effects of the present invention can be expressed better.
以下、図１を用いて本発明を説明するが、本発明はこれに限定されるものではない。尚、以下「％」とあるのは特に断りのない限り質量基準である。 Hereinafter, although this invention is demonstrated using FIG. 1, this invention is not limited to this. Hereinafter, “%” is based on mass unless otherwise specified.
連続的に搬送される帯状シート１１にスライドコーター１３で、固形分濃度が１５質量％のインク受容層塗布液を乾燥重量で２５ｇ／ｍ２塗布した後、乾燥機１４によりインク受容層を乾燥し、インクジェット記録媒体を作成した。詳細な製造条件は以下の通りである。
・インク受容層用塗布液の固形分濃度…１５質量％
・インク受容層用塗布液の含水率・・・５６６質量％（水分量／固形分量）
・塗布速度・・・３０ｍ／ｍｉｎ
・乾燥機・・・全長２５ｍの乾燥路を５つの乾燥ゾーンに分割し、各乾燥ゾーンを風量制御パターン方式で制御
・乾燥風温度・・・１５０℃
・乾燥機出口でのインク受容層の目標含水率・・・６質量％（水分量／固形分量）
乾燥機での風量の制御を行うための、予め求めた風量制御パターンを表１に示す。かかる例は実施例である。定常乾燥時の乾燥風量６ｍ３／ｍｉｎは連続塗布時に製造される記録媒体のインク受容層（塗布膜）の含水率が６質量％になるための乾燥風量である。また、塗布開始時の乾燥風量３ｍ３／ｍｉｎは塗布開始時に製造される記録媒体のインク受容層の含水率が６質量％になるための乾燥風量である。表１の風量アップまでの待ち時間とは、塗布開始時から乾燥開始（乾燥風量上昇開始）までの時間である。表１の風量アップ時間とは、乾燥開始から定常乾燥時までの時間、つまり、風量アップ開始から風量アップ停止までの時間である。また、この時の風量制御パターンを図３に示す。
An ink receiving layer coating solution having a solid content concentration of 15 mass% is applied to the belt-like sheet 11 that is continuously conveyed by a dry weight of 25 g / m 2 by a slide coater 13, and then the ink receiving layer is dried by a dryer 14. An ink jet recording medium was prepared. Detailed manufacturing conditions are as follows.
・ Solid content concentration of coating liquid for ink receiving layer: 15% by mass
-Moisture content of the coating liquid for ink receiving layer: 566% by mass (water content / solid content)
・ Application speed: 30m / min
・ Dryer: The drying path with a total length of 25 m is divided into five drying zones, and each drying zone is controlled by the air volume control pattern method. ・ Drying air temperature: 150 ° C.
・ Target moisture content of the ink receiving layer at the outlet of the dryer: 6% by mass (water content / solid content)
Table 1 shows the air volume control patterns obtained in advance for controlling the air volume in the dryer. Such an example is an example. The dry air volume 6 m 3 / min at the time of steady drying is a dry air volume for the water content of the ink receiving layer (coating film) of the recording medium produced at the time of continuous coating to be 6% by mass. The amount of dry air 3 m 3 / min at the start of application is the amount of dry air required for the water content of the ink receiving layer of the recording medium produced at the start of application to be 6% by mass. The waiting time until the air volume is increased in Table 1 is the time from the start of application to the start of drying (start of increasing the dry air volume). The air volume increase time in Table 1 is the time from the start of drying to the time of steady drying, that is, the time from the start of air volume increase to the stop of air volume increase. Moreover, the air volume control pattern at this time is shown in FIG.
表２は、比較例であり、定常乾燥時に含水率６質量％になるように、乾燥機の各乾燥ゾーンの乾燥風量を乾燥開始時から定常乾燥時の乾燥風量まで一定とした例である。 Table 2 is a comparative example, and is an example in which the amount of drying air in each drying zone of the dryer is constant from the start of drying to the amount of drying air at the time of steady drying so that the moisture content is 6% by mass during steady drying.
実施例及び比較例の結果を図４に示す。実線は実施例の結果を、点線は比較例の結果を表す。 The results of Examples and Comparative Examples are shown in FIG. The solid line represents the result of the example, and the dotted line represents the result of the comparative example.
実施例では、製造開始時と定常乾燥時で、乾燥機出口でのインク受容層の含水率を６質量％±０．５質量％の範囲に制御することができていることが分かる。また、定常乾燥後状態後から製造終了時まで、製造される記録媒体のインク受容層の含水率は６質量％±０．５質量％の範囲に制御できていた。インク受容層のひび割れの発生は、目視では発見されなかった。 In the example, it can be seen that the water content of the ink receiving layer at the outlet of the dryer can be controlled in the range of 6% by mass ± 0.5% by mass at the start of production and at the time of steady drying. Further, the water content of the ink receiving layer of the produced recording medium was controlled in the range of 6% by mass ± 0.5% by mass from the state after steady drying until the end of production. The occurrence of cracks in the ink receiving layer was not found visually.
一方、比較例は、製造開始時から製造終了時において、インク吸収層の含水率が１質量％になり、インク受容層にひび割れが発生したのが目視で確認された。また、インク受容層の含水率が目標の６質量％に安定するまで約７分かかり、その間に製造されたインクジェット記録媒体の大部分が製品ロスとなった。 On the other hand, in the comparative example, from the start of manufacture to the end of manufacture, the water content of the ink absorbing layer was 1% by mass, and it was confirmed visually that the ink receiving layer was cracked. Further, it took about 7 minutes until the water content of the ink receiving layer was stabilized at the target of 6% by mass, and most of the ink jet recording medium produced during that time was a product loss.
さらに、実施例と同様の塗布条件となるように、温度制御により乾燥速度を制御しようとしたが、装置応答速度が間に合わず、製品の含水率が一定になるまで時間がかかった。結果として、比較例に示した条件よりも製品ロスが増加してしまった。温度制御により含水率を制御する場合は、塗布速度を１０ｍ／ｍｉｎまで減速しなければならず、生産性が大きく低下してしまった。 In addition, the drying speed was controlled by temperature control so that the application conditions were the same as in the example. However, the apparatus response speed was not in time, and it took time until the moisture content of the product became constant. As a result, the product loss has increased more than the conditions shown in the comparative example. When the moisture content is controlled by temperature control, the coating speed has to be reduced to 10 m / min, and the productivity is greatly reduced.
Claims (3)
製造される記録媒体の塗布膜の含水率が製造開始時より製造終了時まで一定となるように、該乾燥風の風量を制御することを特徴とする記録媒体の製造方法。 A coating film forming step of forming a coating film by applying a coating solution on a continuously conveyed belt-like sheet, and applying the drying air with a dryer to the belt-like sheet on which the coating film is formed. A drying step for drying, a method for producing a recording medium comprising:
A method for producing a recording medium, characterized in that the air volume of the drying air is controlled so that the moisture content of the coating film of the produced recording medium is constant from the start of production to the end of production.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2009035624A JP2010188285A (en) | 2009-02-18 | 2009-02-18 | Method of manufacturing recording medium |
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| JP2009035624A JP2010188285A (en) | 2009-02-18 | 2009-02-18 | Method of manufacturing recording medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115397568A (en) * | 2020-04-16 | 2022-11-25 | 富士胶片株式会社 | Method for producing coating film |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115397568A (en) * | 2020-04-16 | 2022-11-25 | 富士胶片株式会社 | Method for producing coating film |
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