JP2000246150A - Powder coating method for manufacturing picture sheet and device therefor - Google Patents

Powder coating method for manufacturing picture sheet and device therefor

Info

Publication number
JP2000246150A
JP2000246150A JP11049788A JP4978899A JP2000246150A JP 2000246150 A JP2000246150 A JP 2000246150A JP 11049788 A JP11049788 A JP 11049788A JP 4978899 A JP4978899 A JP 4978899A JP 2000246150 A JP2000246150 A JP 2000246150A
Authority
JP
Japan
Prior art keywords
powder
discharge
powder coating
electrostatic
gun
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.)
Pending
Application number
JP11049788A
Other languages
Japanese (ja)
Inventor
Sadanobu Fukui
定信 福井
Satoshi Kawamura
諭 河村
Satoru Tsuda
悟 津田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bando Chemical Industries Ltd
Original Assignee
Bando Chemical Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bando Chemical Industries Ltd filed Critical Bando Chemical Industries Ltd
Priority to JP11049788A priority Critical patent/JP2000246150A/en
Publication of JP2000246150A publication Critical patent/JP2000246150A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a powder coating method for manufacturing a picture sheet, that the speeding up is attained using substantially one powder feed device (electrostatic powder discharge gun) without remarkably increasing the equipment cost and deteriorating the quality. SOLUTION: Relating to the powder coating device 10 for manufacturing the picture sheet, which is provided with the powder feed device 1 having the electrostatic powder discharge gun 7 for discharging a charged powder coating material, a transporting roller 12 for transporting a sheet base material B and fixation and pressurizing rollers 18a, 18b for fixing a film of the powder coating material discharged and stuck to the sheet base material B, a corona discharge device 13 is installed in the downstream side of the powder feed device 1, an electrostatic discharging device 13 is provided with a high pressure generator and a discharge gun 14 having the same shape as the powder discharge gun 7 and a corona discharge needle 5 is provided on the center part tip of the discharge gun 14 to be projected forward. The discharge gun 14 is arranged in the downstream side of the powder discharge gun 7 to face the powder discharge gun 7 with a certain distance and the discharge needle 15 faces a white powder coating material A discharged from the powder discharge gun 7.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】この発明は、とくにカラー画
像(文字を含む)形成用の受像シート(受像紙)を静電
粉体塗装システムを利用して製造するための粉体塗工方
法とその装置に関するもので、受像シートは熱転写方式
およびインクジェット方式を対象とする。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder coating method for manufacturing an image receiving sheet (image receiving paper) for forming a color image (including characters) by using an electrostatic powder coating system, and a method of manufacturing the same. The image receiving sheet is intended for a thermal transfer system and an ink jet system.

【0002】[0002]

【従来の技術】カラーの文字や画像などを受像シートに
形成するために、昇華性染料からなるインクをインクシ
ートから受像シート上に熱転写する熱転写方式や、液体
インクをノズルから飛翔させて受像シート上に付着させ
るインクジェット方式などの種々の方式が知られてい
る。このような記録方式には、前記インクを受容するた
めのインク受容層をシート基材上に設けた専用の受像シ
ートが用いられている。このような受像シートは、適宜
のシート基材上に樹脂、顔料、充填剤などを含む溶液を
湿式塗工し、これを加熱乾燥させることによって製造さ
れている。
2. Description of the Related Art In order to form color characters and images on an image receiving sheet, a thermal transfer method in which ink composed of a sublimable dye is thermally transferred from an ink sheet onto the image receiving sheet, or a liquid ink is ejected from nozzles to form an image receiving sheet. Various methods, such as an ink-jet method of attaching on the top, are known. In such a recording method, a dedicated image receiving sheet provided with an ink receiving layer for receiving the ink on a sheet substrate is used. Such an image receiving sheet is manufactured by wet-coating a solution containing a resin, a pigment, a filler, and the like on an appropriate sheet substrate, and heating and drying the solution.

【0003】しかし、上記のような湿式塗工により受像
シートを製造すれば、受像シートが高価になることか
ら、シート基材の一面に粉体塗料混合物を供給する粉体
供給装置と、定着ロールおよび加圧ロールを備えるとと
もに、定着ロールの内部に加熱処理手段が設けられ、前
記両ロールの間を通過させることにより、前記粉体塗料
混合物をシート基材の一面に定着させる定着機とを備
え、乾式塗工を行う受像シート製造用の粉体塗工装置が
提案されている(たとえば、特開平10−329245
号公報)。
However, if the image receiving sheet is manufactured by the wet coating as described above, the image receiving sheet becomes expensive. Therefore, a powder supply device for supplying the powder coating mixture to one surface of the sheet substrate, and a fixing roll And a pressure roll, and a heat treatment means is provided inside the fixing roll, and a fixing device for fixing the powder coating material mixture on one surface of the sheet substrate by passing between the two rolls. A powder coating apparatus for producing an image receiving sheet which performs dry coating has been proposed (for example, Japanese Patent Application Laid-Open No. H10-329245).
No.).

【0004】この種の粉体塗工に用いられる粉体供給装
置は、金属素材に静電粉体塗装を行うための一般的な粉
体塗工装置と違って、非常に薄い(3〜50μm)塗工
膜を受像シート基材上に形成する必要がある。これは、
粉体材料の使用量を減らしてコストを抑えること、塗工
膜の厚みが厚くなると受像シートがカールし易くなるこ
と、粉体材料の使用量が増えると塗工後に使用される定
着機のローラに付着する粉体の量が増えて無駄になり不
経済であること、などの理由によるものである。
The powder supply device used for this type of powder coating is very thin (3 to 50 μm) unlike a general powder coating device for performing electrostatic powder coating on a metal material. ) A coating film needs to be formed on the image receiving sheet substrate. this is,
Reduce the cost by reducing the amount of powder material used, the thicker coating film makes it easier for the image receiving sheet to curl, and the higher the amount of powder material used, the more the rollers of the fixing machine used after coating This is because the amount of powder adhering to the surface is increased and wasteful and uneconomical.

【0005】また、金属素材に静電塗装するための一般
的な静電粉体塗工装置は、1台ではせいぜい3m/分程
度のラインスピードにしか対応できないため、それ以上
の高速化を図るためには、ライン進行方向に沿って複数
台の静電粉体塗工装置を並べて配置する必要がある。な
お、金属素材用の粉体塗工装置は、腐食等から金属素材
を保護するため、塗工膜厚みを50〜1000μmと非
常に厚くしていることから、粉体の吐出量は50〜30
0g/分が一般的である。
Further, a general electrostatic powder coating apparatus for electrostatically coating a metal material can respond to a line speed of only about 3 m / min at most, so that a higher speed can be achieved. For this purpose, it is necessary to arrange a plurality of electrostatic powder coating apparatuses side by side along the line traveling direction. In addition, since the powder coating apparatus for metal materials has a very thick coating film thickness of 50 to 1000 μm to protect the metal material from corrosion and the like, the discharge amount of the powder is 50 to 30 μm.
0 g / min is common.

【0006】ところで、本発明の対象とする受像シート
用の粉体塗工装置の場合、上記したように塗工膜は薄く
する必要があることから、たとえば150mm幅の受像
シートロールを10m/分以上の高速で連続塗工する場
合でも、粉体供給装置(静電粉体吐出ガン)から吐出さ
せる粉体供給量は、吸着効率を80%としても10〜2
0g/分程度となり、市販品で対応できる。ただし、市
販品を使用する場合には、粉体供給量が微量であるが定
量ずつ正確に供給させる必要があるため、スクリューフ
ィーダやテーブルフィーダなどを備えたフィーダ式粉体
供給装置やフィードバックシステムを設置しなければな
らず、粉体塗工装置が全体的に複雑なシステムとなるた
め、設備費が非常に高価になっている。
In the case of a powder coating apparatus for an image receiving sheet, which is an object of the present invention, the coating film needs to be thin as described above. Even in the case of continuous coating at a high speed as described above, the powder supply amount discharged from the powder supply device (electrostatic powder discharge gun) is 10 to 2 even if the adsorption efficiency is 80%.
It is about 0 g / min, which can be handled with a commercial product. However, when using a commercially available product, the amount of powder supply is very small, but it is necessary to supply the powder accurately every fixed amount.Therefore, a feeder type powder supply device equipped with a screw feeder, table feeder, etc., or a feedback system is required. Since the powder coating apparatus must be installed, and the powder coating apparatus is a complicated system as a whole, the equipment cost is extremely high.

【0007】[0007]

【発明が解決しようとする課題】上記した従来の受像シ
ート用の粉体塗工装置の場合、粉体供給装置(静電粉体
吐出ガン)が搬送方向(流れ方向)に1台でも受像シー
ト基材が4m/分以下の低速で搬送しているのであれ
ば、定着後の受像シートの品質に影響を及ぼすことはな
かった。しかし、品質を低下させずにたとえば10m/
分程度に高速化を図って製造能力を上げるためには、少
なくとも搬送方向(流れ方向)に2台の粉体供給装置
(静電粉体吐出ガン)を受像シート基材の搬送ラインに
沿って並べて設置する必要があり、設備費が倍増するこ
とになり、受像シートの製造コストがアップする要因に
なる。
In the above-mentioned conventional powder coating apparatus for an image receiving sheet, at least one powder feeder (electrostatic powder discharge gun) is provided in the conveying direction (flow direction). If the substrate was transported at a low speed of 4 m / min or less, the quality of the image-receiving sheet after fixing was not affected. However, for example, 10 m /
In order to increase the production capacity by increasing the speed by about one minute, at least two powder supply devices (electrostatic powder discharge guns) should be arranged along the conveyance line of the image receiving sheet base material in at least the conveyance direction (flow direction). It is necessary to arrange them side by side, which doubles the equipment cost and increases the manufacturing cost of the image receiving sheet.

【0008】いいかえれば、従来の粉体塗工装置では1
台の粉体供給装置(静電粉体吐出ガン)で製造能力を上
げるために高速化を図ると、吐出させた粉体塗料の全
て、いいかえれば必要な量の粉体塗料をシート基材上に
吸着させることが困難になるので、シート基材上に必要
かつ十分な粉体塗料を均一に定着させられず、受像シー
トとしての品質が低下し、たとえばカラー画像の熱転写
時に白抜け箇所が生じるという問題がある。
[0008] In other words, in the conventional powder coating apparatus, 1
When the speed is increased to increase the production capacity with a single powder supply device (electrostatic powder discharge gun), all of the discharged powder paint, in other words, the required amount of powder paint, is placed on the sheet substrate. It is difficult to adsorb the powder coating onto the sheet base material, so that the necessary and sufficient powder coating cannot be uniformly fixed on the sheet base material, thereby deteriorating the quality of the image receiving sheet. There is a problem.

【0009】この発明は上述の点に鑑みなされたもの
で、設備費を大幅に上げずに、実質的に1台の粉体供給
装置(静電粉体吐出ガン)を用いて、品質を低下させる
ことなく高速化を図れる受像シート製造用粉体塗工方法
および同塗工装置を提供することを目的としている。
The present invention has been made in view of the above points, and the quality is reduced by using substantially one powder supply device (electrostatic powder discharge gun) without significantly increasing the equipment cost. It is an object of the present invention to provide a powder coating method and a coating apparatus for manufacturing an image receiving sheet, which can increase the speed without causing the image to be processed.

【0010】[0010]

【課題を解決するための手段】上記の目的を達成するた
めに本発明に係る受像シート製造用粉体塗工方法は、一
定速度で搬送されるシート基材上に、荷電した粉体塗料
を静電粉体吐出ガンから吐出させて静電的に塗装膜を付
着させたのち定着させる受像シート製造用粉体塗工方法
において、前記静電粉体吐出ガンから荷電されつつ吐出
される粉体塗料に対し、該粉体塗料が荷電される電荷と
共通の電荷をコロナ放電によってほぼ同時に付与するこ
とを特徴とするものである。
In order to achieve the above object, a powder coating method for producing an image receiving sheet according to the present invention comprises the steps of: applying a charged powder coating material on a sheet substrate conveyed at a constant speed; In a powder coating method for producing an image receiving sheet, which is discharged from an electrostatic powder discharge gun to electrostatically adhere a coating film and then fixed, the powder discharged while being charged from the electrostatic powder discharge gun The present invention is characterized in that a charge common to the charged powder paint and a common charge are applied to the paint almost simultaneously by corona discharge.

【0011】上記の構成を有する本発明の受像シート製
造用粉体塗工方法によれば、静電粉体吐出ガンから荷電
させつつ吐出させた粉体塗料に対し、その下流側からコ
ロナ放電により粉体塗料に荷電される電荷と共通の電荷
を印加させて繰り返し荷電するから、シート基材の搬送
速度を上げること(高速化)に対応させて静電粉体吐出
ガンからの粉体塗料の吐出量を増やした場合に、たとえ
ば1台の静電粉体吐出ガンでは十分に荷電されていない
粉体塗料にも電荷が十分に印加される。この結果、通
常、粉体塗工位置の下流側に配備される定着ロール間を
通過する前や通過時に、シート基材上に静電付着された
粉体塗料が移動したり剥離したりすることが防止され、
静電粉体吐出ガンから吐出された粉体塗料のほぼ全てが
シート基材上に確実に定着され、薄い一定厚の膜状に均
一に塗工される。
According to the powder coating method for producing an image receiving sheet of the present invention having the above-described structure, the powder coating discharged from the electrostatic powder discharging gun while being charged is subjected to corona discharge from the downstream side. Since the charge is applied repeatedly by applying the same charge as the charge to the powder coating, the powder coating from the electrostatic powder discharge gun can be used in response to increasing the speed of transporting the sheet substrate (higher speed). When the discharge amount is increased, for example, a single electrostatic powder discharge gun sufficiently applies a charge to a powder coating that is not sufficiently charged. As a result, the powder paint electrostatically adhered to the sheet substrate may move or peel before or during the passage between the fixing rolls that are usually provided downstream of the powder coating position. Is prevented,
Almost all of the powder paint discharged from the electrostatic powder discharge gun is reliably fixed on the sheet base material, and is uniformly applied in a thin and constant thickness film.

【0012】上記目的を達成するために請求項2に係る
受像シート製造用粉体塗工装置は、荷電しつつ粉体塗料
を吐出する静電粉体吐出ガンを有する粉体供給装置と、
シート基材を搬送する搬送機構と、シート基材上に吐出
され付着された粉体塗料膜を定着する定着機とを備えた
受像シート製造用粉体塗工装置において、前記静電粉体
吐出ガンの下流側に、前記粉体塗料が荷電される電荷と
共通の電荷を荷電するコロナ放電装置を設けたことを特
徴としている。
According to another aspect of the present invention, there is provided a powder coating apparatus for manufacturing an image receiving sheet, comprising: a powder supply apparatus having an electrostatic powder discharge gun for discharging a powder coating while being charged;
In a powder coating apparatus for manufacturing an image receiving sheet, the apparatus further includes a conveying mechanism for conveying a sheet substrate, and a fixing device for fixing a powder coating film discharged and adhered on the sheet substrate. On the downstream side of the gun, there is provided a corona discharge device for charging a common charge with the charge for charging the powder coating.

【0013】本請求項2に記載の粉体塗工装置によれ
ば、静電粉体吐出ガンを1台だけ使用してシート基材の
高速化に対応させて粉体塗料の吐出量を増やして吐出
し、シート基材上に電荷を十分に有しない一部の粉体が
吐出されても、定着前又は定着時にそれらの粉体塗料が
移動したり剥離したりして、粉体塗料の定着が不十分に
なっても熱転写時などに白抜けが生じるなどの受像シー
トの品質低下が起こらない。しかも、1台の静電粉体吐
出ガンに対し、高電圧発生器とコロナ放電部とを備えた
1台のコロナ放電装置を組み合わせて設けるだけで済む
ために、最低でも2台の静電粉体吐出ガンとそれらの付
属設備を設置していた従来の場合に比べて構造が簡単に
なり設置場所も少なくて済み、また設備費が大幅に削減
される。
According to the powder coating apparatus of the present invention, the discharge amount of the powder coating material is increased by using only one electrostatic powder discharge gun and corresponding to the speeding up of the sheet substrate. Even if some powder that does not have a sufficient charge is discharged on the sheet substrate, those powder coatings move or peel off before or during fixing, and the powder coating Even if the fixing is insufficient, the quality of the image receiving sheet does not deteriorate, such as the occurrence of white spots during thermal transfer. Moreover, since only one corona discharge device having a high-voltage generator and a corona discharge unit is required to be provided for one electrostatic powder discharge gun, at least two electrostatic powder discharge units are provided. The structure is simpler than in the conventional case where the body discharge guns and their attached equipment are installed, the number of installation places is reduced, and the equipment cost is greatly reduced.

【0014】請求項3に記載のように、前記コロナ放電
装置は、高電圧発生器とコロナ放電針(針状電極部)を
備え、前記シート基材の上方で前記静電粉体吐出ガンか
ら荷電されつつ吐出される粉体塗料に向けて前記放電針
を前方へ突出させるのが好ましい。
According to a third aspect of the present invention, the corona discharge device includes a high-voltage generator and a corona discharge needle (needle-shaped electrode portion). It is preferable that the discharge needle protrudes forward toward the powder paint discharged while being charged.

【0015】請求項3に記載の粉体塗工装置によれば、
吐出される粉体の下流側に位置して放電針が前方へ突出
した状態において、粉体吐出ガンにて荷電される電荷と
共通の電荷を前記放電針から放電(印加)させるので、
粉体吐出ガンから吐出された粉体塗料に満遍なくかつ確
実に必要かつ十分な電荷を荷電することができ、またコ
ロナ放電装置が高電圧発生器とコロナ放電針とを備えた
簡単な構造からなるから、別個に静電粉体吐出ガンを備
えた粉体供給装置をもう1台設置するのに比べて設備費
が大幅に削減される。さらに、段替や製造条件等の管理
なども容易になり、作業が簡便になって生産性が向上す
る。
According to the powder coating apparatus of the third aspect,
In a state in which the discharge needle is located downstream of the discharged powder and the discharge needle protrudes forward, a common charge with the charge charged by the powder discharge gun is discharged (applied) from the discharge needle.
The powder paint discharged from the powder discharge gun can be charged uniformly and surely with the necessary and sufficient electric charge, and the corona discharge device has a simple structure including a high voltage generator and a corona discharge needle. Therefore, the equipment cost is greatly reduced as compared with the case where another powder supply device having a separate electrostatic powder discharge gun is installed. Further, management of step change, manufacturing conditions, and the like is facilitated, and work is simplified, and productivity is improved.

【0016】請求項4に記載のように、前記シート基材
の搬送速度が10m/分で、前記静電粉体ガンからの粉
体塗料の吐出量が10〜20g/分であって、該静電粉
体吐出ガンを有する粉体供給装置と前記コロナ放電装置
とをそれぞれ1台ずつ組合わせたものであってもよい。
According to a fourth aspect of the present invention, the conveying speed of the sheet base material is 10 m / min, and the discharge rate of the powder coating from the electrostatic powder gun is 10 to 20 g / min. A combination of one powder supply device having an electrostatic powder discharge gun and one corona discharge device may be used.

【0017】シート基材の搬送速度が10m/分程度で
搬送しながら吐出量が10〜20g/分の粉体塗料をシ
ート基材上に確実に静電塗工するためには、従来は最低
でも2台の静電粉体吐出ガンが必要で、しかも各ガンに
はそれぞれ5〜10g/分の吐出量を正確にかつ安定し
て維持させるためにフィードバックシステムおよびフィ
ーダ式粉体供給装置などの装置を付属させる必要があっ
たが、請求項4に記載の粉体塗工装置によれば粉体供給
装置と前記コロナ放電装置とをそれぞれ1台ずつ組合わ
せて設置することにより品質を落とさずに高速化を十分
に達成できる。したがって、設備コストが大幅に削減さ
れるとともに、段替や装置等の管理などの作業も容易に
なり、生産性が向上する。
Conventionally, in order to reliably apply a powder coating having a discharge amount of 10 to 20 g / min onto a sheet substrate while conveying the sheet substrate at a conveying speed of about 10 m / min, it has conventionally been the minimum. However, two electrostatic powder discharge guns are required, and each gun has a feedback system and a feeder type powder supply device in order to accurately and stably maintain a discharge amount of 5 to 10 g / min. According to the powder coating apparatus according to claim 4, it is necessary to attach the apparatus, but the quality is not deteriorated by installing the powder supply apparatus and the corona discharge apparatus one by one in combination. High speed can be achieved sufficiently. Therefore, equipment costs are greatly reduced, and operations such as step change and management of devices are also facilitated, thereby improving productivity.

【0018】[0018]

【発明の実施の形態】以下、本発明の受像シート製造用
粉体塗工装置の実施の形態を塗工方法とともに図面に基
づいて説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a powder coating apparatus for producing an image receiving sheet according to the present invention will be described below with reference to the drawings together with a coating method.

【0019】昇華型熱転写用受像シートを製造するため
の粉体塗工装置の実施例について説明する。
An embodiment of a powder coating apparatus for producing an image receiving sheet for sublimation type thermal transfer will be described.

【0020】粉体塗工装置からシート基材上に吐出させ
る粉体塗料組成物は、種々の成分を粉体にまとめる結着
剤としての役割と、被熱転写シート(インクシート)上
の画像を形成する昇華性染料を受容し、受像シート上へ
の熱転写を可能とする受容層としての役割をもつ。
The powder coating composition discharged from the powder coating apparatus onto the sheet substrate plays a role as a binder for collecting various components into powder, and forms an image on a heat transfer sheet (ink sheet). It has a role as a receptor layer that receives the sublimable dye to be formed and enables thermal transfer on the image receiving sheet.

【0021】このような樹脂には、たとえば、飽和ポリ
エステル樹脂、ポリアミド樹脂、(メタ)アクリル樹
脂、ポリウレタン樹脂、ポリビニルアルコール樹脂、ポ
リビニルアセタール樹脂、塩化ビニル樹脂、酢酸ビニル
樹脂、塩化ビニル・酢酸ビニル共重合体樹脂、塩化ビニ
リデン樹脂、ポリスチレン樹脂、スチレン・アクリル共
重合体樹脂、スチレン・ブタジエン共重合体樹脂などの
スチレン系樹脂、ポリエチレン樹脂、エチレン酢酸ビニ
ル共重合体樹脂、セルロース系樹脂、エポキシ樹脂など
を挙げることができる。これらの樹脂は、単独で、また
は二種以上の混合物として用いられる。
Such resins include, for example, saturated polyester resins, polyamide resins, (meth) acrylic resins, polyurethane resins, polyvinyl alcohol resins, polyvinyl acetal resins, vinyl chloride resins, vinyl acetate resins, and vinyl chloride / vinyl acetate. Styrene resins such as polymer resin, vinylidene chloride resin, polystyrene resin, styrene / acryl copolymer resin, styrene / butadiene copolymer resin, polyethylene resin, ethylene vinyl acetate copolymer resin, cellulose resin, epoxy resin, etc. Can be mentioned. These resins are used alone or as a mixture of two or more.

【0022】また、粉体塗料組成物には、白色着色剤が
含まれるが、この白色着色剤としては、たとえば亜鉛
華、酸化チタン、酸化錫、硫化亜鉛、炭酸バリウム、ク
レー、シリカ、ホワイトカーボン、タルク、アルミナ、
パライト等があるが、中でも酸化チタンが好ましい。こ
のような白色着色剤は、1〜10重量%の範囲で粉体塗
料組成物に配合される。
The powder coating composition contains a white colorant. Examples of the white colorant include zinc white, titanium oxide, tin oxide, zinc sulfide, barium carbonate, clay, silica and white carbon. , Talc, alumina,
There are pearlite and the like, and among them, titanium oxide is preferable. Such a white colorant is added to the powder coating composition in an amount of 1 to 10% by weight.

【0023】その他に、帯電制御剤やオフセット防止剤
が添加されるが、オフセット防止剤には、パラフィンワ
ックス、ポリオレフィンワックスなどの融点が50〜1
50℃の範囲にあるワックス類が用いられる。帯電制御
剤は1〜10重量%の範囲でまたオフセット防止剤は
0.5〜10重量%の範囲で粉体塗料組成物に配合され
る。さらに、粉体塗料組成物の流動性を高めるために、
疎水性シリカなどの流動性改良剤を0.2〜2重量%の
範囲で添加、配合する。
In addition, an antistatic agent and an anti-offset agent are added. The anti-offset agent has a melting point of 50 to 1 such as paraffin wax and polyolefin wax.
Waxes in the range of 50 ° C are used. The charge control agent is blended in the powder coating composition in the range of 1 to 10% by weight, and the anti-offset agent is blended in the range of 0.5 to 10% by weight. Furthermore, in order to enhance the fluidity of the powder coating composition,
A fluidity improver such as hydrophobic silica is added and blended in the range of 0.2 to 2% by weight.

【0024】最終的に上記した各成分を混合して溶融混
練して冷却したのち、粉砕し分級して平均粒径が1〜3
0μm(好ましくは1〜20μm)になるようにする。
Finally, the above-mentioned components are mixed, melt-kneaded, cooled, pulverized and classified to have an average particle size of 1 to 3.
0 μm (preferably 1 to 20 μm).

【0025】一方、シート基材としては、ロール状に巻
き取った長尺の普通紙が用いられるが、普通紙には通常
のPPCコピー用紙や表面の平滑性を高めるためにカレ
ンダー処理したPPCコピー用紙が使用される。
On the other hand, as the sheet substrate, long plain paper wound up in a roll shape is used. The plain paper may be a regular PPC copy paper or a PPC copy which has been subjected to a calendering process to enhance the surface smoothness. Paper is used.

【0026】本実施例では、静電粉体塗装によりシート
基材上に粉体塗料組成物を薄い膜状に連続して乾式塗工
により形成するために、上記した粉体塗料組成物として
の樹脂成分と白色着色剤のほかに、インクシートとの離
型性を高めるための反応硬化性シリコーオイルの硬化物
を含む白色粉体塗料組成物(以下、単に白色粉体塗料と
いう)を使用している。詳しくは、酸価1.0〜20m
gKOH/g、ガラス転移温度50〜70℃の飽和ポリ
エステル樹脂50〜90重量%とスチレン・アクリル共
重合樹脂50〜10重量%とからなる樹脂混合物を樹脂
成分として70〜95重量%含有させ、さらに相互に反
応し得る少なくとも2種の反応硬化性シリコーンオイル
を0.5〜12重量%を含有させた混合物に、上記した
帯電制御剤やオフセット防止剤等を均一に混合してい
る。
In the present embodiment, the powder coating composition is formed into a thin film continuously by dry coating on a sheet substrate by electrostatic powder coating. In addition to the resin component and the white colorant, a white powder coating composition (hereinafter simply referred to as a white powder coating) containing a cured product of a reaction-curable silicone oil for enhancing the releasability from the ink sheet is used. ing. Specifically, acid value 1.0-20m
a resin mixture of 50 to 90% by weight of a saturated polyester resin having a glass transition temperature of 50 to 70 ° C. and 50 to 10% by weight of a styrene / acrylic copolymer resin as a resin component; The above-described charge control agent, anti-offset agent and the like are uniformly mixed in a mixture containing 0.5 to 12% by weight of at least two kinds of reactive curable silicone oils which can react with each other.

【0027】具体例を挙げると、飽和ポリエステル樹脂
(花王(株)製NE−382,酸価8.9mgKOH/
g,ガラス転移温度62.6℃)71重量%と、スチレ
ン・アクリル共重合樹脂(三井東圧化学(株)製CPR
−200)17重量%とからなる樹脂混合物と、オフセ
ット防止剤(三洋化成工業(株)製ワックス、ピスコー
ル330P)4重量%と、帯電制御剤(オリエント化学
(株)製ボントロンP−51,ベンジルトリブチルアン
モニウム α−ナフトール−4−ヅルホネート)2重量
%と、酸化チタン5重量%と、アミノ変性シリコーンオ
イル(信越化学工業(株)製KF−861)0.5重量
%とエポキシ変性シリコーンオイル(信越化学工業
(株)製KF−102)0.5重量%とを均一に混合
し、130〜180℃の温度で3〜5分ほど溶融混練
し、冷却したのち粉砕して分級し、平均粒径1〜20μ
mの範囲に設定した白色粉体塗料Aを使用する。
Specific examples include a saturated polyester resin (NE-382 manufactured by Kao Corporation, acid value 8.9 mgKOH /
g, glass transition temperature: 62.6 ° C.) and 71% by weight of styrene-acrylic copolymer resin (CPR manufactured by Mitsui Toatsu Chemicals, Inc.)
-200) 17% by weight of a resin mixture, 4% by weight of an anti-offset agent (Wax, Piscol 330P manufactured by Sanyo Chemical Industries, Ltd.), and a charge control agent (Bontron P-51, benzyl manufactured by Orient Chemical Co., Ltd.) 2% by weight of tributylammonium α-naphthol-4-perfonate), 5% by weight of titanium oxide, 0.5% by weight of an amino-modified silicone oil (KF-861 manufactured by Shin-Etsu Chemical Co., Ltd.) and an epoxy-modified silicone oil (Shin-Etsu) 0.5% by weight (KF-102 manufactured by Chemical Industry Co., Ltd.), melt-kneaded at a temperature of 130 to 180 ° C. for 3 to 5 minutes, cooled, pulverized and classified to obtain an average particle size. 1-20μ
The white powder coating material A set in the range of m is used.

【0028】図1は本発明の実施例に係る昇華型熱転写
用受像シート製造用の粉体塗工装置の要部を概略的に示
す正面図、図2はスクリューフィーダ式粉体供給装置の
基本構造を示す正面視断面図である。
FIG. 1 is a front view schematically showing a main part of a powder coating apparatus for producing a sublimation type thermal transfer image receiving sheet according to an embodiment of the present invention, and FIG. 2 is a basic view of a screw feeder type powder supply apparatus. It is a front view sectional view showing a structure.

【0029】上記の白色粉体塗料Aは、図2に示すよう
にスクリューフィーダ式粉体供給装置1の塗料タンク2
に投入される。この供給装置1は、供給タンク2内に撹
拌プレート3を備え、供給タンク2内の底部に配備され
たスクリュー4がモータ5で回転されることにより、白
色粉体塗料Aが前方の供給口へ搬送され、供給口に配設
された整流板6により整流されながら、粉体吐出ガン7
を先端部に備えた下方のインジェクター8へ供給され
る。インジェクター8の後端から高圧エアが導入され、
スクリュー4の回転数制御にて定量ずつ供給される白色
粉体塗料Aが前方へ吐出されるが、図1に示すように吐
出口7aの中心部に、白色粉体塗料Aに本例では負(−)
の電荷を荷電させるための放電針9が前方へ突設されて
いる。このため、粉体供給装置1には、図示を省略した
直流電源による負の高電圧(たとえば−70kV)発生
器が内蔵されている。
As shown in FIG. 2, the above-mentioned white powder paint A is supplied to a paint tank 2 of a screw feeder type powder supply device 1.
It is thrown into. The supply device 1 includes a stirring plate 3 in a supply tank 2, and a screw 4 provided at a bottom portion in the supply tank 2 is rotated by a motor 5 so that the white powder coating material A is supplied to a front supply port. While being conveyed and rectified by the rectifying plate 6 disposed at the supply port, the powder discharge gun 7
Is supplied to a lower injector 8 having a tip portion. High pressure air is introduced from the rear end of the injector 8,
The white powder coating material A, which is supplied by a fixed amount at a time by controlling the rotation speed of the screw 4, is discharged to the front, but as shown in FIG. (−)
A discharge needle 9 for charging the electric charge of the first electrode is projected forward. For this reason, the powder supply device 1 has a built-in negative high voltage (for example, -70 kV) generator by a DC power supply not shown.

【0030】そして、図1に示すように、静電粉体塗工
装置10は、シート基材Bの搬送途中に上面が平坦な塗
工台11が設置されており、この塗工台11上を本例で
は幅150mmのシート基材Bが搬送機構としての上下
一対の搬送ローラ12の回転により10m/分の高速度
で搬送される。塗工台11の上方に粉体供給装置1が配
設され、この粉体吐出ガン7が下方のシート基材Bの搬
送方向に向けて配置されている。粉体吐出ガン7から吐
出される白色粉体塗料Aの吐出量は10〜20g/分に
設定され、本例では白色粉体塗料Aが吐出する際に、放
電針9からの放電によって負(−)に荷電される。なお、
本例では粉体吐出ガン7は、塗工台11上のシート基材
BからH(本例では150mm)上方に配置される。
As shown in FIG. 1, the electrostatic powder coating apparatus 10 is provided with a coating table 11 having a flat upper surface during the conveyance of the sheet base material B. In this example, a sheet substrate B having a width of 150 mm is conveyed at a high speed of 10 m / min by rotation of a pair of upper and lower conveying rollers 12 as a conveying mechanism. The powder supply device 1 is disposed above the coating table 11, and the powder discharge gun 7 is disposed in a direction in which the sheet material B below is conveyed. The discharge amount of the white powder paint A discharged from the powder discharge gun 7 is set to 10 to 20 g / min, and in this example, when the white powder paint A is discharged, the discharge amount from the discharge needle 9 is negative ( −) Is charged. In addition,
In this example, the powder discharge gun 7 is disposed above the sheet base B on the coating table 11 by H (in this example, 150 mm).

【0031】一方、粉体供給装置1の下流側にコロナ放
電装置13が設置され、この放電装置13は負の高電圧
(たとえば−70kV)を発生する直流電源の高電圧発
生器(図示せず)を備えるとともに、粉体吐出ガン7と
同一形状の放電ガン14を備え、この放電ガン14の吐
出口14aの中心部にコロナ放電針(鉢状電極部)15
が前方へ突設されている。放電ガン14は粉体吐出ガン
7の下流側に所定距離L(本例では100mm)をあけ
て粉体吐出ガン7と対向するように配置され、つまり放
電針15を図1のように粉体吐出ガン7から吐出される
白色粉体塗料Aに向けている。塗工台11の表面には導
電性の平滑板16が貼着され、この平滑板16にアース
電線17の一端が接続され他端が接地されて、上面が接
地された平滑板16を介して、一定速度で搬送されるシ
ート基材Bを接地させている。塗工台11のさらに下流
側には、一対のローラからなる定着機18が配備され、
上面に白色粉体塗料Aが静電的に付着したシート基材B
を定着ローラ18aと加圧ローラ18bで加熱すると同
時に押圧挟持している。
On the other hand, a corona discharge device 13 is installed downstream of the powder supply device 1, and this discharge device 13 is a high voltage generator (not shown) of a DC power supply for generating a negative high voltage (for example, -70 kV). ) And a discharge gun 14 having the same shape as the powder discharge gun 7, and a corona discharge needle (pot-shaped electrode portion) 15 is provided at the center of the discharge port 14 a of the discharge gun 14.
Is projected forward. The discharge gun 14 is disposed downstream of the powder discharge gun 7 at a predetermined distance L (100 mm in this example) so as to face the powder discharge gun 7, that is, as shown in FIG. It is directed to the white powder paint A discharged from the discharge gun 7. A conductive smooth plate 16 is adhered to the surface of the coating table 11, and one end of a ground wire 17 is connected to the smooth plate 16, and the other end is grounded. The sheet base material B conveyed at a constant speed is grounded. On the further downstream side of the coating table 11, a fixing device 18 including a pair of rollers is provided.
Sheet base material B with white powder coating A electrostatically attached to the upper surface
Is heated by the fixing roller 18a and the pressing roller 18b and simultaneously pressed and held.

【0032】以上のようにして、本発明の実施例に係る
静電粉体塗工装置10が構成されるが、この装置10に
より下記の手順でシート基材B上に白色粉体塗料Aが塗
工される。すなわち、 シート基材Bは塗工台11上を所定速度(10m/
分)で搬送され、平滑板16を介してシート基材Bが接
地される。
As described above, the electrostatic powder coating apparatus 10 according to the embodiment of the present invention is constituted, and the white powder coating A is formed on the sheet base material B by the following procedure using this apparatus 10. Coated. That is, the sheet base material B moves on the coating table 11 at a predetermined speed (10 m /
), And the sheet base material B is grounded via the smooth plate 16.

【0033】 シート基材Bの上方の粉体吐出ガン7
の放電針9から負の電荷(コロナイオン)が放電され、
負の電荷が荷電されながら白色粉体塗料Aが定量(10
〜20g/分)ずつ連続的に吐出され、シート基材Bの
表面との間の静電界中で生じる吸引力によって付着され
る。粉体吐出ガン7から吐出される白色粉体塗料Aの一
部には、負の電荷の印加が十分に行われていない白色粉
体塗料Aが含まれるが、これらの白色粉体塗料Aに対し
て、すぐ下流側に配置されているコロナ放電装置13の
コロナ放電針15から放電されるコロナイオンにより負
の電荷が印加されるので、吐出された白色粉体塗料Aの
全てが負(−)の電荷に十分に荷電される。
The powder discharge gun 7 above the sheet substrate B
A negative charge (corona ion) is discharged from the discharge needle 9 of
While the negative charge is charged, the amount of white powder paint A is determined (10
(Approximately 20 g / min), and is adhered by a suction force generated in an electrostatic field between the sheet substrate B and the surface thereof. A part of the white powder paint A discharged from the powder discharge gun 7 includes the white powder paint A to which the application of the negative charge is not sufficiently performed. On the other hand, since a negative charge is applied by corona ions discharged from the corona discharge needle 15 of the corona discharge device 13 disposed immediately downstream, all of the discharged white powder coating material A is negative (−). ) Is sufficiently charged.

【0034】 一方、シート基材Bに、粉体吐出ガン
7から吐出された負(−)の電荷を帯びた白色粉体塗料A
の粒子が静電的に吸着されると、シート基材Bの表面で
大部分放電するが、残留する電荷により吸引力を保持
し、シート基材B上に付着している。さらのその外側に
飛来した白色粉体塗料Aの粒子は先に付着した粒子との
間に静電吸引力を生じて付着することにより白色粉体塗
料Aの皮膜厚さを増すが、次第にその電位差は小さくな
って吸引力が低下し、ついには脱落するので、皮膜厚さ
は所定の厚さになる。このようにして、図1に示すよう
にシート基材B上に白色粉体塗料Aが、ほぼ均一にかつ
所定厚さ(10〜20μm)の薄膜状に塗工される。
On the other hand, a negative (−) charged white powder paint A discharged from the powder discharge gun 7
When the particles are electrostatically adsorbed, most of the discharge occurs on the surface of the sheet substrate B, but the particles retain the suction force due to the remaining charge and adhere to the sheet substrate B. Furthermore, the particles of the white powder coating A that fly to the outside generate an electrostatic attraction between the previously attached particles and adhere to the white powder coating A, thereby increasing the film thickness of the white powder coating A. The potential difference is reduced, the suction force is reduced, and eventually the film falls off, so that the film thickness becomes a predetermined thickness. In this way, as shown in FIG. 1, the white powder coating material A is applied on the sheet base material B almost uniformly and in a thin film having a predetermined thickness (10 to 20 μm).

【0035】 シート基材B上に塗工された白色粉体
塗料Aは、定着ローラ18aと加圧ローラ18bとの間
で押圧挟持され、加熱されると同時に加圧されるが、白
色粉体塗料Aの全てが十分に荷電された状態でシート基
材B上に付着され、付着された白色粉体塗料Aが相互に
吸着し合っているために、定着ローラ18aと加圧ロー
ラ18bによる定着前や定着時に移動したり、剥離した
りすることがない。そして、定着ローラ18aと加圧ロ
ーラ18bとで均一に加熱溶融されて白色粉体塗料Aの
膜厚はやや薄く(5〜15μm)なって定着され、熱転
写用受像シートCが製造される。
The white powder coating material A applied on the sheet substrate B is pressed and held between the fixing roller 18a and the pressing roller 18b, and is heated and pressed at the same time. All of the paint A is adhered onto the sheet base material B in a sufficiently charged state, and the adhered white powder paint A is mutually adsorbed, so that the fixing by the fixing roller 18a and the pressure roller 18b is performed. It does not move or peel off before or during fixing. Then, the white powder coating material A is heated and melted uniformly by the fixing roller 18a and the pressing roller 18b, and the film thickness of the white powder coating material A becomes slightly thinner (5 to 15 μm) and is fixed, and the image receiving sheet C for thermal transfer is manufactured.

【0036】この結果、熱転写用受像シートCの製造速
度(製造能力)が3〜4倍に向上し、しかもシート基材
B上に白色粉体塗料Aが満遍なく定着加工され、高品質
の受像シートCが製造される。
As a result, the manufacturing speed (manufacturing capacity) of the thermal transfer image receiving sheet C is improved 3 to 4 times, and the white powder coating material A is uniformly fixed on the sheet base material B to obtain a high quality image receiving sheet. C is manufactured.

【0037】上記に本発明の昇華性熱転写用受像シート
の製造用粉体塗工装置と粉体塗工方法の一実施例につい
て説明したが、下記のように実施することが可能であ
る。
The embodiment of the powder coating apparatus and the powder coating method for producing the image receiving sheet for sublimation thermal transfer according to the present invention has been described above. However, the present invention can be carried out as follows.

【0038】(1) シート基材Bの幅が2倍になったり、
あるいは搬送速度を2倍上げたりする場合には、粉体供
給装置1とコロナ放電装置13との組の2組をシート基
材Bの幅方向又は搬送方向に沿って設置し、対応させる
ことができる。
(1) The width of the sheet base material B is doubled,
Alternatively, when the transport speed is doubled, two sets of the powder supply device 1 and the corona discharge device 13 may be installed along the width direction or the transport direction of the sheet base material B to correspond. it can.

【0039】(2) 上記実施例では昇華性熱転写用の白色
粉体塗料Aについて説明したが、インクジェット用のカ
ラーインクを受容する受容層を形成するのに適した樹脂
成分やインクジェットに好適な配合からなる白色粉体塗
料を使用することにより、上記と共通の静電粉体塗工装
置10により同じ要領でインクジェット用受像シートを
製造することができる。すなわち、インクジェット方式
用受像シートの場合は、インクの吸水性を上げるために
非吸水性樹脂をベースとした粉体塗料組成物と親水性無
機微粒子あるいは吸水性ポリマーとを含有する粉体塗料
混合物が静電塗工に使用されるものであり、粉体塗料組
成物の粒子径は、非吸水性ポリマー(疎水性樹脂)に親
水性無機微粒子あるいは吸水性ポリマーを練り混み、粉
砕することにより調整される。
(2) In the above embodiment, the white powder coating material A for sublimation thermal transfer was described. However, a resin component suitable for forming a receiving layer for receiving a color ink for inkjet or a compound suitable for inkjet. By using a white powder coating composed of the following, an inkjet image receiving sheet can be manufactured in the same manner by the same electrostatic powder coating apparatus 10 as described above. That is, in the case of an image receiving sheet for an ink jet system, a powder coating mixture containing a powder coating composition based on a non-water-absorbing resin and hydrophilic inorganic fine particles or a water-absorbing polymer in order to increase the water absorption of the ink. Used in electrostatic coating, the particle size of the powder coating composition is adjusted by mixing and milling hydrophilic inorganic fine particles or a water-absorbing polymer with a non-water-absorbing polymer (hydrophobic resin). You.

【0040】より詳しく説明すると、前記非吸水性樹脂
は、上記した熱転写用受像シートの製造に使用した樹脂
と共通しているので説明は省略するが、とくに、インク
ジェット方式の受像シートには、内添の吸水性材料が使
用され、吸水性ポリマーは、日本触媒(株)のアクアリ
ック、三洋化成工業(株)のサンフレッシュなどが、親
水性シリカは、シオノギ製薬(株)のカープレックス、
水澤化学工業(株)のMizukasilなどが、炭酸カルシウ
ムは、米庄石灰工業(株)のEV−D、白石中央研究所
のカルライトKTなどが挙げられる。
More specifically, the non-water-absorbing resin is common to the resin used in the production of the thermal transfer image-receiving sheet described above, and thus description thereof is omitted. Water-absorbing materials are used. The water-absorbing polymer is Nippon Shokubai Co., Ltd.'s Aqualic, Sanyo Chemical Industry Co., Ltd.'s Sun Fresh, etc. The hydrophilic silica is Shionogi Pharmaceutical Co., Ltd.'s Carplex,
Mizukasil of Mizusawa Chemical Industry Co., Ltd., and calcium carbonate include EV-D of Yonesho Lime Industry Co., Ltd. and Callite KT of Shiroishi Central Research Institute.

【0041】また外添剤も使用されるが、これには、親
水性無機微粒子あるいは、親水性と疎水性無機微粒子の
併用が考えられる。具体的には、日本アエロジル(株)
では、親水性として、50,90G,130,200,
200V,220CF,200FAD,300,300
CF,380,OX50,TT600,MOX80,M
OX170,COK84,酸化アルミニウムC,二酸化
チタンP25など、疎水性としては、R972,R97
2V,R972CF,R974,R202,R805,
R812,R812S、二酸化チタンT805,RX2
00,RY200などが挙げられる。クラリアントジャ
パン(株)では、親水性として、S13,V15,N2
0,T30,T40など、疎水性として、H15,H2
0,H30,H2000,H2000/4,H300
4,H2015EP,H2050EPなどが挙げられ
る。
An external additive is also used. For this purpose, hydrophilic inorganic fine particles or a combination of hydrophilic and hydrophobic inorganic fine particles can be considered. Specifically, Nippon Aerosil Co., Ltd.
Then, as hydrophilicity, 50, 90G, 130, 200,
200V, 220CF, 200FAD, 300, 300
CF, 380, OX50, TT600, MOX80, M
OX170, COK84, aluminum oxide C, titanium dioxide P25, etc.
2V, R972CF, R974, R202, R805,
R812, R812S, Titanium dioxide T805, RX2
00, RY200 and the like. Clariant Japan Co., Ltd. has S13, V15, N2
H15, H2 as hydrophobicity such as 0, T30, T40
0, H30, H2000, H2000 / 4, H300
4, H2015EP, H2050EP and the like.

【0042】[0042]

【発明の効果】以上説明したことから明らかなように、
受像シート製造用粉体塗工方法又は塗工装置には、次の
ような優れた効果がある。
As is apparent from the above description,
The powder coating method or coating apparatus for producing an image receiving sheet has the following excellent effects.

【0043】(1) 請求項1に記載の発明では、静電粉
体吐出ガンから荷電させつつ吐出させた粉体塗料に対
し、その下流側からコロナ放電により粉体塗料に荷電さ
れる電荷と共通の電荷を繰り返し(二重に)印加するか
ら、シート基材の搬送速度を上げる高速化に対応させて
静電粉体吐出ガンからの粉体の吐出量を増やしても、吐
出される粉体に必要かつ十分な電荷を荷電させられる。
したがって、粉体塗工位置より下流側に配備される定着
用ロール間の通過前又は通過時に、シート基材上に静電
付着された粉体が従来のように移動したり剥離したりす
ることがなく、静電粉体吐出ガンから吐出される粉体の
ほぼ全てがシート基材上に確実に定着され、一定厚の膜
状に均一かつ確実に塗工される。
(1) According to the first aspect of the present invention, with respect to the powder paint discharged while being charged from the electrostatic powder discharge gun, the electric charge charged to the powder paint by corona discharge from the downstream side is obtained. Since the common charge is applied repeatedly (double), even if the discharge amount of the powder from the electrostatic powder discharge gun is increased in response to the increase in the speed at which the sheet base material is conveyed, the discharged powder The body is charged with the necessary and sufficient charge.
Therefore, before or during the passage between the fixing rolls disposed downstream of the powder coating position, the powder electrostatically adhered to the sheet substrate moves or separates as in the related art. Almost all of the powder discharged from the electrostatic powder discharge gun is reliably fixed on the sheet base material, and is uniformly and reliably applied to a film having a constant thickness.

【0044】(2) 請求項2に記載の発明では、静電粉
体吐出ガンを1台のみ使用したうえでシート基材の高速
化に対応させて粉体の吐出量を増やしシート基材上に荷
電しつつ吐出しても、従来とは違って荷電が不十分にな
って粉体が移動あるいは剥離し熱転写時などに白抜けが
生じるなどという受像シートの品質低下がなく、しか
も、1台の静電粉体吐出ガンに対しては高電圧発生器と
コロナ放電部とを備えた1台のコロナ放電装置を組み合
わせて設けるだけで済むために、少なくとも2台の静電
粉体吐出ガンとそれらの付属設備を設置する場合に比べ
て構造が簡単で設置場所も少なくて済み、設備費を大幅
に削減できる。
(2) According to the second aspect of the present invention, only one electrostatic powder discharge gun is used, and the discharge amount of the powder is increased in response to the increase in the speed of the sheet substrate. Even if it is discharged while being charged, there is no deterioration in the quality of the image receiving sheet, such as the insufficient charging, the powder moves or peels off, and white spots occur during thermal transfer, etc. Since only one corona discharge device having a high-voltage generator and a corona discharge unit needs to be provided in combination for at least two electrostatic powder discharge guns, at least two electrostatic powder discharge guns are required. The structure is simpler and the number of installation locations is smaller than in the case of installing such ancillary equipment, and equipment costs can be greatly reduced.

【0045】(3) 請求項3に記載の発明では、吐出さ
れる粉体の下流側に位置して放電針を前方へ突出させた
状態において、粉体吐出ガンにて荷電される電荷と共通
の電荷を前記放電針から放電するので、吐出された粉体
に満遍なくかつ確実かつ十分に荷電することができ、ま
たコロナ放電装置は高電圧発生器とコロナ放電針とを備
えた簡単な構造からなるから、別個に静電粉体吐出ガン
を備えた粉体供給装置をもう1台設置するのに比べて設
備費が大幅に削減され、さらに段替や製造条件等の管理
などの作業も容易になり、生産性が向上する。
(3) According to the third aspect of the present invention, in a state where the discharge needle is located at the downstream side of the powder to be discharged and protrudes forward, it is common to the electric charge charged by the powder discharge gun. Is discharged from the discharge needle, the discharged powder can be charged uniformly and reliably and sufficiently, and the corona discharge device has a simple structure including a high-voltage generator and a corona discharge needle. Therefore, equipment costs are greatly reduced compared to installing another powder supply device equipped with a separate electrostatic powder discharge gun, and work such as step change and management of manufacturing conditions is also easy. And productivity is improved.

【0046】(4) 請求項4に記載の発明では、シート
基材を搬送速度10m/分程度の高速で搬送しながら吐
出量10〜20g/分の粉体塗料をシート基材上に確実
に静電塗工する際に、粉体供給装置と前記コロナ放電装
置とをそれぞれ1台ずつ組合わせて設置するだけで粉体
の塗工作業を十分に達成できるから、設備コストが大幅
に削減されるとともに、段替や装置等の管理などの作業
も容易になり、生産性が一段と向上する。
(4) According to the fourth aspect of the present invention, while the sheet base material is conveyed at a high speed of about 10 m / min, the powder coating material having a discharge rate of 10 to 20 g / min is surely applied onto the sheet base material. At the time of electrostatic coating, the powder coating operation can be sufficiently achieved only by installing and combining the powder supply device and the corona discharge device one by one, so that the equipment cost is greatly reduced. In addition, operations such as step change and management of devices and the like are facilitated, and productivity is further improved.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施例に係る昇華型熱転写用受像シー
ト製造用の粉体塗工装置の要部を概略的に示す正面図で
ある。
FIG. 1 is a front view schematically showing a main part of a powder coating apparatus for producing an image receiving sheet for sublimation type thermal transfer according to an embodiment of the present invention.

【図2】スクリューフィーダ式粉体供給装置の基本構造
を示す正面視断面図である。
FIG. 2 is a front sectional view showing the basic structure of the screw feeder type powder supply device.

【符号の説明】[Explanation of symbols]

1 スクリューフィーダ式粉体供給装置 2 塗料タンク 3 撹拌プレート 4 スクリュー 5 モータ(駆動装置) 7 粉体吐出ガン 8 インジェクター 9 放電針 10 静電粉体塗工装置 11 塗工台 12 搬送ローラ 13 コロナ放電装置 14 放電ガン 15 コロナ放電針(電極部) 16 平滑板 17 アース電線 18 定着機 18a 定着ローラ 18b 加圧ローラ A 白色粉体塗料(組成物) B シート基材 DESCRIPTION OF SYMBOLS 1 Screw feeder type powder supply apparatus 2 Paint tank 3 Stirring plate 4 Screw 5 Motor (drive device) 7 Powder discharge gun 8 Injector 9 Discharge needle 10 Electrostatic powder coating apparatus 11 Coating table 12 Transport roller 13 Corona discharge Apparatus 14 Discharge gun 15 Corona discharge needle (electrode part) 16 Smooth plate 17 Ground wire 18 Fixing device 18a Fixing roller 18b Pressure roller A White powder paint (composition) B Sheet base material

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) B41M 5/38 B41M 5/26 101H (72)発明者 津田 悟 兵庫県神戸市兵庫区明和通3丁目2番15号 バンドー化学株式会社内 Fターム(参考) 2H111 DA01 DA10 4D075 AA09 AA25 AA52 AA58 AA71 BB29Z DA04 DA06 DB18 DC27 EA02 4F034 AA01 BA01 BB04 CA02 CA23 DA03 DA13 DA26 4F035 AA03 CA02 CA04 CB13 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) B41M 5/38 B41M 5/26 101H (72) Inventor Satoru Tsuda 3-2 Meiwadori, Hyogo-ku, Kobe-shi, Hyogo Prefecture No. 15 Bando Chemical Co., Ltd. F term (reference) 2H111 DA01 DA10 4D075 AA09 AA25 AA52 AA58 AA71 BB29Z DA04 DA06 DB18 DC27 EA02 4F034 AA01 BA01 BB04 CA02 CA23 DA03 DA13 DA26 4F035 AA03 CA02 CA04 CB13

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 一定速度で搬送されるシート基材上に、
荷電した粉体塗料を静電粉体吐出ガンから吐出させて静
電的に塗装膜を付着させたのち定着させる受像シート製
造用粉体塗工方法において、 前記静電粉体吐出ガンから荷電されつつ吐出される粉体
塗料に対し、該粉体塗料が荷電される電荷と共通の電荷
をコロナ放電によってほぼ同時に付与させることを特徴
とする受像シート製造用粉体塗工方法。
1. A sheet base material conveyed at a constant speed,
In a powder coating method for manufacturing an image receiving sheet, in which a charged powder paint is discharged from an electrostatic powder discharge gun to electrostatically adhere and apply a coating film, and then fixed, the charged powder paint is charged from the electrostatic powder discharge gun. A powder coating method for producing an image receiving sheet, wherein a charge common to a charged powder coating and a common charge are applied to the discharged powder coating almost simultaneously by corona discharge.
【請求項2】 荷電しつつ粉体塗料を吐出する静電粉体
吐出ガンを有する粉体供給装置と、シート基材を搬送す
る搬送機構と、シート基材上に吐出され付着された粉体
塗料膜を定着する定着機とを備えた受像シート製造用粉
体塗工装置において、 前記静電粉体吐出ガンの下流側に、前記粉体塗料が荷電
される電荷と共通の電荷を荷電するコロナ放電装置を設
けたことを特徴とする受像シート製造用粉体塗工装置。
2. A powder supply device having an electrostatic powder discharge gun for discharging a powder paint while being charged, a transport mechanism for transporting a sheet substrate, and a powder discharged and adhered on the sheet substrate. In a powder coating apparatus for manufacturing an image receiving sheet, comprising a fixing device for fixing a paint film, a charge common to the charge of the powder paint is charged downstream of the electrostatic powder discharge gun. A powder coating apparatus for manufacturing an image receiving sheet, comprising a corona discharge device.
【請求項3】 前記コロナ放電装置は、高電圧発生器と
放電針を備え、前記シート基材の上方で前記静電粉体吐
出ガンから荷電されつつ吐出される粉体塗料に向けて前
記放電針を前方へ突出している請求項2記載の受像シー
ト製造用粉体塗工装置。
3. The corona discharge device includes a high voltage generator and a discharge needle, and discharges the powder toward the powder paint discharged from the electrostatic powder discharge gun while being charged above the sheet substrate. 3. The powder coating apparatus for manufacturing an image receiving sheet according to claim 2, wherein the needle is projected forward.
【請求項4】 前記シート基材の搬送速度が10m/分
で、前記静電粉体ガンからの粉体塗料の吐出量が10〜
20g/分であって、該静電粉体吐出ガンを有する粉体
供給装置と前記コロナ放電装置とをそれぞれ1台ずつ組
合わせたものからなる請求項2又は3記載の受像シート
製造用粉体塗工装置。
4. The method according to claim 1, wherein the sheet base material is conveyed at a speed of 10 m / min, and a discharge amount of the powder paint from the electrostatic powder gun is 10 to 10 m / min.
4. The powder for producing an image receiving sheet according to claim 2, wherein the powder is 20 g / min, and the powder supply device having the electrostatic powder discharge gun is combined with one of the corona discharge devices. Coating equipment.
JP11049788A 1999-02-26 1999-02-26 Powder coating method for manufacturing picture sheet and device therefor Pending JP2000246150A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11049788A JP2000246150A (en) 1999-02-26 1999-02-26 Powder coating method for manufacturing picture sheet and device therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11049788A JP2000246150A (en) 1999-02-26 1999-02-26 Powder coating method for manufacturing picture sheet and device therefor

Publications (1)

Publication Number Publication Date
JP2000246150A true JP2000246150A (en) 2000-09-12

Family

ID=12840909

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007204184A (en) * 2006-01-31 2007-08-16 Dainippon Ink & Chem Inc Powder and grain supply device
JP2016059869A (en) * 2014-09-17 2016-04-25 富士ゼロックス株式会社 Powder coating device and powder coating method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007204184A (en) * 2006-01-31 2007-08-16 Dainippon Ink & Chem Inc Powder and grain supply device
JP2016059869A (en) * 2014-09-17 2016-04-25 富士ゼロックス株式会社 Powder coating device and powder coating method
US10035172B2 (en) 2014-09-17 2018-07-31 Fuji Xerox Co., Ltd. Powder coating apparatus including a unit that charges and fluidizes a thermosetting powder coating material

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