JPH05309730A - Manufacturing method for embossed sheet and its device - Google Patents

Manufacturing method for embossed sheet and its device

Info

Publication number
JPH05309730A
JPH05309730A JP4113753A JP11375392A JPH05309730A JP H05309730 A JPH05309730 A JP H05309730A JP 4113753 A JP4113753 A JP 4113753A JP 11375392 A JP11375392 A JP 11375392A JP H05309730 A JPH05309730 A JP H05309730A
Authority
JP
Japan
Prior art keywords
sheet
roll
temperature
textured
die
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.)
Granted
Application number
JP4113753A
Other languages
Japanese (ja)
Other versions
JP3065787B2 (en
Inventor
Hideji Kimura
秀治 木村
Masataka Kotani
政孝 小谷
Mitsuhiro Imaizumi
光博 今泉
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.)
Resonac Holdings Corp
Original Assignee
Showa Denko KK
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 Showa Denko KK filed Critical Showa Denko KK
Priority to JP4113753A priority Critical patent/JP3065787B2/en
Publication of JPH05309730A publication Critical patent/JPH05309730A/en
Application granted granted Critical
Publication of JP3065787B2 publication Critical patent/JP3065787B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/222—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length characterised by the shape of the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/16—Cooling
    • B29C2035/1658—Cooling using gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0041—Crystalline

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

PURPOSE:To improve productivity steeply by enabling an embossed sheet to be molded by a broader molding condition than conventionally in manufacture of the embossed sheet. CONSTITUTION:In manufacture of an embossed sheet of crystalline thermoplastic resin, at least one side sheet surface is cooled before a section wherein it is nipped with a first roll 2 and a second roll 3 after a die 1 by jetting gas of which temperature is lower than a melting point of the resin by using an air- knife or/and an air-chamber. Thereby, an embossing property will be excellent, and its production can be improved.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は溶融押出される結晶性熱
可塑性樹脂シートの製造方法および製造装置に関し、特
に該樹脂シートのシボ付き性を高める製造方法および製
造装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a crystalline thermoplastic resin sheet to be melt extruded, and more particularly to a method and an apparatus for enhancing the graininess of the resin sheet.

【０００２】[0002]

【従来の技術】図１に示しているように、従来熱可塑性
樹脂を押出機によりダイ（１）を介して溶融押出し、シ
ボ付きシートを製造する場合、第１ロール（２）と第２
ロール（３）のうち一方又は両方にシボ付きロールを配
し、これらのロールにてシートを圧着してシボ模様がシ
ートの片面または両面に有するシボ付きシートを得る製
造方法および製造装置は広く知られている。2. Description of the Related Art As shown in FIG. 1, when a conventional thermoplastic resin is melt-extruded by an extruder through a die (1) to produce a textured sheet, a first roll (2) and a second roll (2) are used.
A manufacturing method and a manufacturing apparatus for obtaining a textured sheet having a textured pattern on one side or both sides of the sheet by arranging a textured roll on one or both of the rolls (3) and pressing the sheet with these rolls are widely known. Has been.

【０００３】[0003]

【発明が解決しようとする課題】上述の方法において、
ポリエチレンやポリプロピレンなどの結晶性熱可塑性樹
脂は、ポリスチレンなどの非晶性熱可塑性樹脂と比較す
るとシボ模様が転写されにくく、さらに成形条件によっ
てはシボ模様の転写が悪化し、特に成形スピードを上げ
るとシボ付き性が極端に悪化し、生産性を上げることが
できないという問題がある。特にシートの下表面は、上
表面と比較してシボ模様がつきにくいため両面にシボ模
様を有するシボ付きシートを効率良く製造することがで
きないという問題がある。シボ模様の転写が悪化する成
形条件は、成形速度が速い場合、シート厚さが厚い場
合、押出温度が高い場合、ロール温度が高い場合などで
ある。本発明は、成形条件によってシボ模様の転写が悪
化し、非常に限られた成形条件でしかシボ付きシートが
成形できないという問題を解決し、より広い成形条件で
シボ付きシートの成形を可能にし、生産性を大幅に向上
させる製造方法及び製造装置を提供することを課題とす
る。SUMMARY OF THE INVENTION In the above method,
Compared to amorphous thermoplastics such as polystyrene, crystalline thermoplastics such as polyethylene and polypropylene are less likely to transfer the embossed pattern, and depending on the molding conditions, the transfer of the embossed pattern worsens, especially when the molding speed is increased. There is a problem that the graininess is extremely deteriorated and the productivity cannot be increased. In particular, the lower surface of the sheet is less likely to have an embossed pattern than the upper surface, so that there is a problem that it is not possible to efficiently manufacture a textured sheet having an embossed pattern on both sides. The molding conditions under which the transfer of the embossed pattern is deteriorated include a high molding speed, a thick sheet thickness, a high extrusion temperature, and a high roll temperature. The present invention solves the problem that the transfer of the embossed pattern is deteriorated by the molding conditions, and the textured sheet can be molded only under extremely limited molding conditions, and enables the molding of the textured sheet under a wider molding condition, An object of the present invention is to provide a manufacturing method and a manufacturing apparatus that significantly improve productivity.

【０００４】[0004]

【課題を解決するための手段】上記課題は結晶性熱可塑
性樹脂のシボ付きシート製造方法において、ダイ後で、
第１ロールと第２ロールでニップされる区間前の少なく
とも片側のシート表面に、エアーナイフまたは／および
エアーチャンバーを用いて、該樹脂の融点以下の気体を
噴射することにより冷却することを特徴とするシボ付き
シート製造方法、特に、シートが第１ロールと第２ロー
ルでニップされる区間を通過した後のシートの表面温度
を熱可塑性樹脂の融点以下にすることを特徴とするシボ
付きシート製造方法、およびダイ後で、第１ロールと第
２ロールでニップされる区間の少なくとも片側にエアー
ナイフまたは／およびエアーチャンバーを設けたことを
特徴とするシート製造装置により解決される。Means for Solving the Problems The above-mentioned problems are, in a method for producing a textured sheet of a crystalline thermoplastic resin, after a die,
Characterized in that an air knife or / and an air chamber is used to jet a gas having a melting point of the resin or lower onto at least one side of the sheet surface before the section nipped by the first roll and the second roll to cool the sheet. A method for producing a textured sheet, in particular, a method for producing a textured sheet, characterized in that the surface temperature of the sheet after passing through a section where the sheet is nipped by the first roll and the second roll is made equal to or lower than the melting point of the thermoplastic resin. A method and a sheet manufacturing apparatus characterized by providing an air knife or / and an air chamber on at least one side of a section nipped by a first roll and a second roll after a die.

【０００５】本発明において原料として用いる結晶性熱
可塑性樹脂は、結晶化する性質を持ち、加熱によって軟
化するプラスチックであればよく、最も代表的なもの
は、ポリプロピレンである。その他の原料としては、高
密度ポリエチレン、低密度ポリエチレン、エチレン共重
合体、ポリアミドなど、シート成形できるすべての結晶
性熱可塑性樹脂を用いることができる。The crystalline thermoplastic resin used as a raw material in the present invention may be any plastic which has the property of crystallizing and is softened by heating, and the most typical one is polypropylene. As other raw materials, it is possible to use all crystalline thermoplastic resins that can be formed into sheets, such as high-density polyethylene, low-density polyethylene, ethylene copolymer, and polyamide.

【０００６】本発明者はシート表面温度とシボ付き性の
関係を詳細に検討した結果、シート表面温度がシボ付き
性と密接な関係を有すること及びダイから第１ロールま
たは第２ロールまでのシート表面に結晶性熱可塑性樹脂
の融点以下の気体を噴射することによりシート表面温度
を容易に下げうることを見出し、本発明を完成するに至
ったものである。As a result of a detailed study of the relationship between the sheet surface temperature and the graininess, the present inventor has found that the sheet surface temperature has a close relationship with the graininess and that the sheet from the die to the first roll or the second roll. The inventors have found that the temperature of the sheet surface can be easily lowered by injecting a gas having a temperature below the melting point of the crystalline thermoplastic resin onto the surface, and have completed the present invention.

【０００７】[0007]

【作用】シボ模様の消失は、第１ロールと第２ロールに
よるシート表面の冷却不足が原因である。すなわち、従
来のシボ付きシート製造装置（図１）を用いて両面シボ
付きシートを製造する場合では、シートの上表面（ア）
が第１ロールに接触することによってシートの上表面温
度は低下するが、第１ロールを離れるとシート内部の熱
によって表面温度は再び上昇する。この時、成形条件に
よっては第１ロールの冷却不足により、シートの上表面
の温度が樹脂の融点以上になるためシボ模様が消失す
る。また、シートの下表面（イ）が第２ロールに接触す
ることによってシートの下表面温度が低下し、シートの
下表面の樹脂は結晶化する。The disappearance of the grain pattern is caused by insufficient cooling of the sheet surface by the first roll and the second roll. That is, when a double-sided textured sheet is manufactured using the conventional textured sheet manufacturing apparatus (FIG. 1), the upper surface of the sheet (a)
When the sheet comes into contact with the first roll, the upper surface temperature of the sheet decreases, but when the sheet leaves the first roll, the surface temperature rises again due to the heat inside the sheet. At this time, depending on the molding conditions, the temperature of the upper surface of the sheet becomes higher than the melting point of the resin due to insufficient cooling of the first roll, so that the wrinkle pattern disappears. Further, the lower surface (a) of the sheet comes into contact with the second roll, so that the lower surface temperature of the sheet is lowered and the resin on the lower surface of the sheet is crystallized.

【０００８】第２ロールの冷却不足により、この結晶化
が区間II（図１）で起こらず、区間III （図１）で起こ
ると、シートが結晶化に伴い収縮するため、第２ロール
がシボロールの場合には、半溶融状態のシートの下表面
が第２ロール上を移動するため、シボ模様が消失すると
考えられる。また、低温の空気を樹脂表面に噴射するこ
とによってシート温度を十分下げることができ、結晶性
熱可塑性樹脂のシボ付きシート製造装置において冷却不
足によるシボ模様の消失を妨げ、シボ付き性を向上さ
せ、シボ付きシートの生産性を大幅に向上させることが
できた。すなわち、ダイから第１ロールまたは／および
第２ロールまでのシート表面にエアーナイフ及び／また
はエアーチャンバーを用いて、樹脂の結晶化温度以下、
望ましくは５０℃以下、さらに望ましくは３０℃以下の
気体を噴射し、シートがニップされる前に樹脂温度を予
め下げることによって、第１ロールと第２ロールでシー
ト表面を十分冷却することができる。Due to insufficient cooling of the second roll, this crystallization does not occur in the section II (FIG. 1), and if it occurs in the section III (FIG. 1), the sheet shrinks as the crystallization occurs. In the case of (3), the lower surface of the sheet in the semi-molten state moves on the second roll, and it is considered that the grain pattern disappears. In addition, the temperature of the sheet can be sufficiently lowered by injecting low-temperature air onto the surface of the resin, which prevents the texture pattern of the crystalline thermoplastic resin from disappearing due to insufficient cooling and improves the texture. , We were able to significantly improve the productivity of the textured sheet. That is, using an air knife and / or an air chamber on the sheet surface from the die to the first roll and / or the second roll, the crystallization temperature of the resin or lower,
The surface of the sheet can be sufficiently cooled by the first roll and the second roll by injecting a gas of preferably 50 ° C. or lower, more preferably 30 ° C. or lower, and lowering the resin temperature in advance before the sheet is nipped. .

【０００９】特に、両面シボ付きシートを製造する場
合、図１のイ側は冷却されやすいにもかかわらずシボが
つきにくいが、図２のようにダイから第２ロールまでの
シート表面を冷却すると効果が大きい。さらに第１ロー
ルと第２ロールでニップされる区間通過直後のシートの
上表面をエアーナイフまたは／およびエアーチャンバー
で冷却してもよい。In particular, in the case of manufacturing a double-sided textured sheet, although the side a in FIG. 1 is easily cooled, graininess is less likely to occur, but when the sheet surface from the die to the second roll is cooled as shown in FIG. Great effect. Further, the upper surface of the sheet immediately after passing through the section nipped by the first roll and the second roll may be cooled with an air knife and / or an air chamber.

【００１０】[0010]

【実施例】以下、実施例により、本発明をさらに詳細に
説明する。 （実施例１〜３）図３は本発明の実施例を示すシートの
製造装置の側面図である。図３の装置において、田辺プ
ラスチックス機械（株）製押出機（４０ｍｍφ、Ｌ／Ｄ
＝３２）、ダイ（巾４００ｍｍ）、第１〜３ロール（２
００ｍｍφ）を用いてシート成形を行った。第１ロール
と第２ロールにシボ付きロール（シボ深さ70μm のマッ
トロール、（株）宮森金属製版所製）を用いた。また、
成形条件はダイ温度２３０℃、第１ロール温度６０℃、
第２ロール温度６０℃、第３ロール温度３０℃で、樹脂
は昭和電工（株）製ポリプロピレン（Ｍｎ＝８．００×
１０4 、Ｍｗ＝５２．３３×１０4 、Ｍｗ／Ｍｎ＝６．
５４、ρ＝０．９０ｇ／ｃｍ3 、融点１６０℃、結晶化
温度１１０℃）を用いた。この例において、エアーナイ
フは、ダイの１０ｃｍ下に取り付けられ、フリクション
ブロアー（３．７ＫＷ、最大風量４．０ｍ3 ／min ）に
連結されており、空気温度は３０℃であった。エアーナ
イフの空気吹き出し口は、ダイから第２ロールまでのシ
ートの下表面に向けられていた。EXAMPLES The present invention will be described in more detail below with reference to examples. (Examples 1 to 3) FIG. 3 is a side view of a sheet manufacturing apparatus showing an example of the present invention. In the apparatus shown in FIG. 3, an extruder manufactured by Tanabe Plastics Co., Ltd. (40 mmφ, L / D
= 32), die (width 400 mm), first to third rolls (2
The sheet was formed by using (00 mmφ). Textured rolls (matte rolls having a texture depth of 70 μm, manufactured by Miyamori Metal Mfg. Co., Ltd.) were used as the first roll and the second roll. Also,
Molding conditions are: die temperature 230 ℃, first roll temperature 60 ℃,
The temperature of the second roll is 60 ° C., the temperature of the third roll is 30 ° C., and the resin is polypropylene (Mn = 8.00 ×) manufactured by Showa Denko KK
10 4 , Mw = 52.33 × 10 4 , Mw / Mn = 6.
54, ρ = 0.90 g / cm 3 , melting point 160 ° C., crystallization temperature 110 ° C.). In this example, the air knife was attached 10 cm below the die, was connected to a friction blower (3.7 KW, maximum air volume 4.0 m 3 / min), and the air temperature was 30 ° C. The air outlet of the air knife was aimed at the lower surface of the sheet from the die to the second roll.

【００１１】以上の条件下で原料吐出量、引取速度を変
えて得られたシートの表面粗さ、表面状態を表１に示
す。表中における表面粗さは、JIS B0601-1982に従い十
点平均粗さRzを求めた。十点平均粗さは断面曲線から基
準長さだけ抜き取った部分において、平均線に平行、か
つ、断面曲線を横切らない直線から縦倍率の方向に測定
した最高から５番目までの山頂の標高の平均値と、最深
から５番目までの谷底の標高の平均値との差をμm で表
したものをいう。従ってシボ付き性が悪い場合には、シ
ート表面が平坦に近づくため十点平均粗さは小さくな
る。表１から明らかなように、エアーナイフから空気を
噴射してシート表面にあてることにより引取速度が速く
てもシートの表面状態は良好であった。Table 1 shows the surface roughness and surface condition of the sheets obtained by changing the discharge amount of the raw material and the take-up speed under the above conditions. For the surface roughness in the table, the ten-point average roughness Rz was determined according to JIS B0601-1982. Ten-point average roughness is the average of the elevations from the highest to the fifth summit measured in the direction of longitudinal magnification from a straight line that does not cross the cross-section curve and is parallel to the average line in the part where the reference length is extracted from the cross-section curve. The difference between the value and the average value of the valley bottom elevations from the deepest to the fifth is expressed in μm. Therefore, when the graininess is poor, the sheet surface approaches a flat surface, and the ten-point average roughness becomes small. As is clear from Table 1, the surface condition of the sheet was good even when the take-up speed was high by injecting air from the air knife to hit the surface of the sheet.

【００１２】（比較例１〜３）エアーナイフから空気を
噴射しなかったほかは、実施例１〜３と同様の操作を行
ったが、シートの表面状態はよくなかった。(Comparative Examples 1 to 3) The same operations as in Examples 1 to 3 were carried out except that the air was not jetted from the air knife, but the surface condition of the sheet was not good.

【００１３】[0013]

【表１】 [Table 1]

【００１４】[0014]

【発明の効果】本発明による製造装置を用いた製造方法
によって、第２ロール上でのシート表面の温度の上昇が
抑えられ、従来の方法よりも高い引取速度でシボをつけ
ることが可能になる。シボ付きシートはデスクマット、
文具、ＶＴＲケース、かばん、食品容器などに利用でき
る。By the manufacturing method using the manufacturing apparatus according to the present invention, the rise of the temperature of the sheet surface on the second roll is suppressed, and it becomes possible to form the grain at a higher take-up speed than the conventional method. .. Desk mat with textured sheet,
It can be used for stationery, VTR cases, bags, food containers, etc.

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

【図１】従来のシボ付きシート製造装置の側面図FIG. 1 is a side view of a conventional textured sheet manufacturing apparatus.

【図２】本発明の実施例を示すシボ付きシート製造装置
の側面図FIG. 2 is a side view of the wrinkled sheet manufacturing apparatus showing the embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１ ダイ ２ 第１ロール（シボ付きロール） ３ 第２ロール（シボ付きロールまたはつや付きロー
ル） ア シートの上表面 イ シートの下表面 Ｉ ダイからシートがニップされるまでのシートの区間 II シートがニップされる区間 III シートがニップされる区間通過直後から第２ロー
ルから離れるまでのシートの区間1 die 2 1st roll (texture roll) 3 2nd roll (texture roll or glossy roll) a sheet upper surface i sheet lower surface I sheet section from die to nip sheet II sheet Nipped section III Sheet section from immediately after passing the sheet nip section to leaving the second roll

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 結晶性熱可塑性樹脂のシボ付きシート製
造方法において、ダイ後で、第１ロールと第２ロールで
ニップされる区間前の少なくとも片側のシート表面に、
エアーナイフまたは／およびエアーチャンバーを用い
て、該樹脂の融点以下の気体を噴射することにより冷却
することを特徴とするシボ付きシート製造方法。1. A method for producing a textured sheet of a crystalline thermoplastic resin, wherein at least one side of the sheet surface after the die and before a section nipped by the first roll and the second roll,
A method for producing a textured sheet, which comprises cooling by jetting a gas having a melting point of the resin or lower using an air knife or / and an air chamber. 【請求項２】 シートが第１ロールと第２ロールでニッ
プされる区間を通過した後のシートの表面温度を熱可塑
性樹脂の融点以下にすることを特徴とする請求項１記載
のシボ付きシート製造方法。2. The textured sheet according to claim 1, wherein the surface temperature of the sheet after passing through the section where the sheet is nipped by the first roll and the second roll is set to be equal to or lower than the melting point of the thermoplastic resin. Production method. 【請求項３】 ダイ後で、第１ロールと第２ロールでニ
ップされる区間の少なくとも片側にエアーナイフまたは
／およびエアーチャンバーを設けたことを特徴とするシ
ート製造装置。3. A sheet manufacturing apparatus comprising an air knife and / or an air chamber provided on at least one side of a section nipped by the first roll and the second roll after the die.
JP4113753A 1992-05-06 1992-05-06 Method and apparatus for producing a textured sheet Expired - Fee Related JP3065787B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4113753A JP3065787B2 (en) 1992-05-06 1992-05-06 Method and apparatus for producing a textured sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4113753A JP3065787B2 (en) 1992-05-06 1992-05-06 Method and apparatus for producing a textured sheet

Publications (2)

Publication Number Publication Date
JPH05309730A true JPH05309730A (en) 1993-11-22
JP3065787B2 JP3065787B2 (en) 2000-07-17

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ID=14620261

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Link
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1925425A1 (en) * 2005-09-14 2008-05-28 FUJIFILM Corporation Method for producing concave-convex sheet and apparatus for producing concave-convex sheet
CN100402263C (en) * 2003-12-25 2008-07-16 Ykk株式会社 Continuous molding method and molding apparatus for surface fastener
JPWO2015008759A1 (en) * 2013-07-16 2017-03-02 倉敷紡績株式会社 Release film

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100402263C (en) * 2003-12-25 2008-07-16 Ykk株式会社 Continuous molding method and molding apparatus for surface fastener
EP1925425A1 (en) * 2005-09-14 2008-05-28 FUJIFILM Corporation Method for producing concave-convex sheet and apparatus for producing concave-convex sheet
EP1925425A4 (en) * 2005-09-14 2012-08-29 Fujifilm Corp Method for producing concave-convex sheet and apparatus for producing concave-convex sheet
JPWO2015008759A1 (en) * 2013-07-16 2017-03-02 倉敷紡績株式会社 Release film

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