JP2003103711A - Release sheet - Google Patents

Release sheet

Info

Publication number
JP2003103711A
JP2003103711A JP2001299809A JP2001299809A JP2003103711A JP 2003103711 A JP2003103711 A JP 2003103711A JP 2001299809 A JP2001299809 A JP 2001299809A JP 2001299809 A JP2001299809 A JP 2001299809A JP 2003103711 A JP2003103711 A JP 2003103711A
Authority
JP
Japan
Prior art keywords
resin
layer
sheet
release
release sheet
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
JP2001299809A
Other languages
Japanese (ja)
Inventor
Masahiro Yamazoe
眞宏 山添
Hiroshi Shibata
洋 柴田
Yuji Ishii
祐司 石井
Hitoshi Suzuki
仁 鈴木
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.)
Toppan Inc
Original Assignee
Toppan Printing Co 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 Toppan Printing Co Ltd filed Critical Toppan Printing Co Ltd
Priority to JP2001299809A priority Critical patent/JP2003103711A/en
Publication of JP2003103711A publication Critical patent/JP2003103711A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a release sheet capable of being manufactured with good productivity by a simple method such as a co-extrusion lamination method of the like, excellent in both of interlaminar strength and heat resistance and having excellent repeating durability for the manufacture of synthetic leather. SOLUTION: The release sheet has a two-layered releasable resin layer 2 formed by providing an intermediate layer 3 comprising a polyethylenic resin with a melting point of 120 deg.C or higher and a surface layer 4 comprising a polypropylene resin or polymethyl pentene resin with a melting point of 160 deg.C or higher on at least the single surface of a substrate sheet 1 so that the thickness ratio of both layers 3 and 4 becomes 35:65-5:95. The releasable resin layer 2 is desirably provided on both surfaces of the substrate sheet 1.

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】本発明は、合成皮革製造時、
特にキャスティング法による合成皮革の製造工程におい
て、いわゆる工程紙として利用される離型シートに関す
るものである。
TECHNICAL FIELD The present invention relates to the production of synthetic leather,
In particular, the present invention relates to a release sheet used as so-called process paper in the manufacturing process of synthetic leather by the casting method.

【0002】[0002]

【従来の技術】合成皮革用の樹脂には、ポリ塩化ビニル
樹脂やポリウレタン樹脂などの合成樹脂が用いられる。
これらの合成樹脂を、例えばエンボス凹凸形状や艶を変
化させたものなどの、各種の紋様が表面に形成された離
型シートの離型面に塗工し、一定時間養生後、該合成樹
脂を離型シートの離型面から剥離することによって、離
型シートの離型面の紋様が賦形された合成皮革が製造さ
れる。
2. Description of the Related Art As a synthetic leather resin, a synthetic resin such as polyvinyl chloride resin or polyurethane resin is used.
These synthetic resins are applied to the release surface of a release sheet having various patterns formed on the surface, such as those with varying embossed uneven shape and gloss, and after curing for a certain period of time, the synthetic resin is applied. By peeling from the release surface of the release sheet, a synthetic leather having a pattern on the release surface of the release sheet is manufactured.

【0003】係る用途に利用される従来の離型シート
は、ポリプロピレン樹脂又はポリメチルペンテン樹脂等
のオレフィン系樹脂を積層させた紙の樹脂面に対して、
エンボスを付与させたものが多い。また、紙の表面にオ
レフィン系樹脂を押し出すと同時にエンボスを付与させ
て積層する製造方法も知られている。
A conventional release sheet used for such an application is prepared by laminating an olefin resin such as polypropylene resin or polymethylpentene resin on a resin surface of paper.
Many are embossed. Further, a manufacturing method is also known in which an olefin resin is extruded on the surface of paper and embossed at the same time, and laminated.

【0004】しかしながら、紙の表面にポリプロピレン
樹脂やポリメチルペンテン樹脂を直接押し出して積層す
る際に、これらの樹脂が紙に良く接着するように溶融粘
度を十分に下げた高温で積層すると、高温のために紙が
劣化し、切れたり歪んだり、離型シートとしての耐久性
が著しく低下したりする。一方、紙が劣化しない低温で
積層すると、樹脂の溶融粘度が高いために十分な接着性
が得られず、界面での剥離や皺寄り等の原因となる。
However, when a polypropylene resin or a polymethylpentene resin is directly extruded on the surface of a paper to be laminated, if the resin is laminated at a high temperature with a sufficiently low melt viscosity so that the resin adheres well to the paper, a high temperature As a result, the paper deteriorates, is cut or distorted, and the durability as a release sheet is significantly reduced. On the other hand, when the paper is laminated at a low temperature at which it does not deteriorate, the resin has a high melt viscosity, so that sufficient adhesiveness cannot be obtained, which may cause peeling or wrinkling at the interface.

【0005】低温でも十分に紙と接着するように、ポリ
プロピレン樹脂やポリメチルペンテン樹脂に代えて、例
えばポリエチレン樹脂等の様な低融点の樹脂を使用する
と、合成皮革製造時の熱に耐えられずに、離型シートの
表面の紋様が消失してしまったり、熱変形のために繰り
返し使用が不可能となったりするという問題がある。
If a low melting point resin such as polyethylene resin is used instead of polypropylene resin or polymethylpentene resin so that it can be sufficiently adhered to paper even at a low temperature, it cannot withstand the heat during the production of synthetic leather. In addition, there are problems that the pattern on the surface of the release sheet disappears, and it cannot be used repeatedly due to thermal deformation.

【0006】[0006]

【発明が解決しようとする課題】本発明は、従来の技術
における上記の様な問題点を解決すべくなされたもので
あり、その目的とするところは、合成皮革の製造におけ
る繰り返しの使用に耐える耐熱性を有し、しかも層間の
接着強度にも優れた離型シートを提供することにある。
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems in the prior art, and its object is to endure repeated use in the production of synthetic leather. An object of the present invention is to provide a release sheet having heat resistance and excellent adhesive strength between layers.

【0007】[0007]

【課題を解決するための手段】本発明の離型シートは、
基材シートの少なくとも片面に離型性樹脂層が積層され
てなる離型シートにおいて、前記離型性樹脂層が基材シ
ート側から順に、融点120℃以上のポリエチレン系樹
脂からなる中間層と、融点160℃以上のホモポリプロ
ピレン樹脂又はポリメチルペンテン樹脂からなる表面層
とからなり、且つ前記中間層と前記表面層との厚みの比
率が35:65〜5:95であることを特徴とする離型
シートである。
The release sheet of the present invention comprises:
In a release sheet in which a release resin layer is laminated on at least one surface of a base sheet, the release resin layer is an intermediate layer made of polyethylene resin having a melting point of 120 ° C. or higher in order from the side of the base sheet. A surface layer made of a homopolypropylene resin or a polymethylpentene resin having a melting point of 160 ° C. or higher, and a thickness ratio of the intermediate layer and the surface layer is 35:65 to 5:95. It is a mold sheet.

【0008】また本発明の離型シートは、前記離型性樹
脂層が基材シートの両面に積層されてなることを特徴と
する離型シートである。
The release sheet of the present invention is a release sheet characterized in that the release resin layer is laminated on both sides of a base sheet.

【0009】[0009]

【発明の実施の形態】本発明の離型シートは、図1に示
す様に、基材シート1の少なくとも片面に、基材シート
1側から順に、中間層3及び表面層4の二層から構成さ
れる、離型性樹脂層2が設けられてなるものである。そ
して、中間層3は、融点120℃以上のポリエチレン系
樹脂から、表面層4は、融点160℃以上のホモポリプ
ロピレン樹脂又はポリメチルペンテン樹脂から、それぞ
れ構成されている。さらに、中間層3と表面層4との厚
みの比率は、35:65〜5:95の範囲内とされる。
BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, a release sheet of the present invention comprises two layers of an intermediate layer 3 and a surface layer 4 on at least one side of a base sheet 1 in order from the side of the base sheet 1. The releasable resin layer 2 is provided. The intermediate layer 3 is made of a polyethylene resin having a melting point of 120 ° C. or higher, and the surface layer 4 is made of a homopolypropylene resin or a polymethylpentene resin having a melting point of 160 ° C. or higher. Further, the thickness ratio between the intermediate layer 3 and the surface layer 4 is within the range of 35:65 to 5:95.

【0010】離型性樹脂層2は、基材シート1の片面の
みに設けられていても良いが、図2に示す様に、基材シ
ート1の両面に設けることもできる。離型性樹脂層2を
基材シート1の両面に設けると、表裏対称の積層構造と
なることから、温湿度変化等によるカールが抑制され、
合成皮革の製造に投入する際に、離型シートが既にカー
ルしていることによるトラブルが発生することがないと
共に、合成皮革の製造工程での加熱によるカールの発生
も少ないので、製品である合成皮革の品質が安定するこ
とに加え、製造した合成皮革を剥離した後の離型シート
も、カールが少ないのでそのまま繰り返し再利用可能で
あり、繰り返し耐久性に優れる利点がある。
The releasable resin layer 2 may be provided on only one side of the base sheet 1, but it may be provided on both sides of the base sheet 1 as shown in FIG. When the releasable resin layer 2 is provided on both surfaces of the base material sheet 1, a curl due to changes in temperature and humidity is suppressed because the laminated structure has a symmetrical front and back.
When it is put into the production of synthetic leather, the release sheet does not have any problems due to the curling of the release sheet, and the curling due to heating in the synthetic leather manufacturing process is small, so it is a product. In addition to the stable quality of the leather, the release sheet after peeling the manufactured synthetic leather has little curl, so that it can be reused as it is, and it has the advantage of excellent repeated durability.

【0011】離型性樹脂層2の表面には、周知の様に、
天然皮革の表面に現れた凹凸形状を模した皮絞模様や、
表面光沢の調整のための艶消加工、人工的な凹凸による
意匠性を付与するための各種柄の凹凸模様などの、種々
の紋様5が施されるのが一般的である。離型性樹脂層2
が基材シート1の両面に設けられる場合には、紋様5
は、図2に示す様に、基材シート1の片面側の離型性樹
脂層2の表面のみに設けられていても良いが、図3に示
す様に、両面側の離型性樹脂層2の表面に、同一若しく
は異なるパターンの紋様5を設けても良い。この様にす
ると、一方の面の紋様5が傷付きや熱変形等により劣化
しても、他方の面の紋様5を使用して合成皮革の製造を
続行できるので、離型シートの耐久性が実質的に2倍に
向上する利点がある。
On the surface of the releasable resin layer 2, as is well known,
A leather pattern that imitates the uneven shape that appeared on the surface of natural leather,
Generally, various patterns 5 such as a matte processing for adjusting the surface gloss and an uneven pattern of various patterns for imparting designability due to artificial unevenness are applied. Releasable resin layer 2
5 is provided on both sides of the base sheet 1, the pattern 5
2 may be provided only on the surface of the releasable resin layer 2 on one side of the base material sheet 1 as shown in FIG. 2, but as shown in FIG. The patterns 5 having the same or different patterns may be provided on the surface of 2. By doing so, even if the pattern 5 on one surface is deteriorated due to scratches or thermal deformation, the synthetic leather can be continuously produced using the pattern 5 on the other surface, so that the durability of the release sheet is improved. There is an advantage of substantially doubling.

【0012】本発明の離型シートにおいて、基材シート
1としては紙がよく用いられるが、合成樹脂フィルム類
の使用も可能であり、合成皮革製造用の工程紙として用
いられる後工程での都合を考慮して適宜選定すればよ
い。厚さも特に限定はなく、離型シートの製造工程にお
ける取扱性や加工性、合成皮革製造用の工程紙としての
適性等を考慮して適宜設計すればよい。一般的には、紙
であれば坪量40〜300g/m2程度のものが用いら
れる場合が多い。
In the release sheet of the present invention, paper is often used as the base material sheet 1, but synthetic resin films can also be used, which is convenient in the post-process used as a process paper for producing synthetic leather. May be selected as appropriate. The thickness is not particularly limited, and may be appropriately designed in consideration of handleability and processability in the production process of the release sheet, suitability as a process paper for producing synthetic leather, and the like. In general, paper having a basis weight of about 40 to 300 g / m 2 is often used.

【0013】離型性樹脂層2の内の表面側の層である表
面層4は、本発明の離型シートの用途である合成皮革の
製造工程において、その表面に塗工され固化されるポリ
塩化ビニル樹脂又はポリウレタン樹脂等の塗膜に対し
て、その固化後の容易な剥離を可能にすると共に、その
表面に皮絞模様等の紋様5を賦型する機能を有するもの
である。従って、製造する合成皮革の表皮層を構成する
ポリ塩化ビニル樹脂又はポリウレタン樹脂等の樹脂に対
する離型性が要求されるが、逆に離型性が強すぎても、
該樹脂が塗工中に撥かれたり、固化中に塗膜の浮き剥が
れが発生したりするので、適度な濡れ性も必要である。
従って、表面層4の離型性は適度なものでなければなら
ない。
The surface layer 4, which is the surface side layer of the releasable resin layer 2, is a poly layer which is coated and solidified on the surface in the process of manufacturing the synthetic leather which is the purpose of the release sheet of the present invention. It has a function of enabling easy peeling after solidification of a coating film of vinyl chloride resin or polyurethane resin, and having a pattern 5 such as a leather pattern on the surface thereof. Therefore, the mold releasability to a resin such as a polyvinyl chloride resin or a polyurethane resin constituting the surface layer of the synthetic leather to be produced is required, but on the contrary, if the releasability is too strong,
Since the resin is repelled during coating or the coating film is peeled off during solidification, appropriate wettability is also required.
Therefore, the releasability of the surface layer 4 must be appropriate.

【0014】また、表面層4には、その表面に塗工され
るポリ塩化ビニル樹脂又はポリウレタン樹脂等の塗膜の
乾燥固化工程において加えられる熱によって、変形した
り紋様5が消失したりすることがない程度の耐熱性も要
求される。この様な要求を満たすために、表面層4とし
ては、離型性の優れたオレフィン系樹脂の中でも、耐熱
性の優れたホモポリプロピレン樹脂又はポリメチルペン
テン樹脂であって、融点が160℃以上のものを選定す
る必要がある。その中でも、特に耐熱性を要求される場
合には、ポリメチルペンテン樹脂が使用される。
Further, the surface layer 4 may be deformed or the pattern 5 may disappear due to heat applied in a step of drying and solidifying a coating film such as polyvinyl chloride resin or polyurethane resin applied to the surface thereof. Heat resistance to the extent that there is no To meet such requirements, the surface layer 4 is a homopolypropylene resin or a polymethylpentene resin having excellent heat resistance among olefin resins having excellent releasability, and has a melting point of 160 ° C. or higher. It is necessary to select one. Among them, polymethylpentene resin is used when heat resistance is required.

【0015】表面層4の基材シート1側に設けられる中
間層3は、紙などの基材シート1を劣化させることのな
い温度において、基材シート1と表面層4とを強固に接
着させるために設けられるものである。その目的から、
少なくとも表面層4を構成する樹脂よりも融点が低く、
より低い温度で高い流動性を発現することが重要であ
り、加えて、紙などの基材シート1及びホモポリプロピ
レン樹脂又はポリメチルペンテン樹脂からなる表面層の
両者と優れた接着性を示す樹脂である必要がある。その
一方で、中間層3を構成する樹脂の耐熱性が低すぎて
も、合成皮革の製造工程において中間層3が著しく熱軟
化し、層間剥離や位置ずれ、皺寄り、繰り返し耐久性の
低下等の原因となる。この様な観点から、本発明におい
ては中間層3の構成材料として、融点が120℃以上の
ポリエチレン系樹脂を採用することが重要である。
The intermediate layer 3 provided on the base sheet 1 side of the surface layer 4 firmly bonds the base sheet 1 and the surface layer 4 at a temperature that does not deteriorate the base sheet 1 such as paper. It is provided for this purpose. From that purpose,
The melting point is at least lower than that of the resin forming the surface layer 4,
It is important to develop high fluidity at a lower temperature, and in addition, a resin showing excellent adhesiveness to both the base sheet 1 such as paper and the surface layer made of homopolypropylene resin or polymethylpentene resin. Need to be On the other hand, even if the heat resistance of the resin constituting the intermediate layer 3 is too low, the intermediate layer 3 is significantly softened by heat in the synthetic leather manufacturing process, resulting in delamination, misalignment, wrinkling, deterioration in repeated durability, etc. Cause of. From such a viewpoint, in the present invention, it is important to adopt a polyethylene resin having a melting point of 120 ° C. or higher as a constituent material of the intermediate layer 3.

【0016】上記ポリエチレン系樹脂としては、低密度
ポリエチレン樹脂(LDPE)、線状低密度ポリエチレ
ン樹脂(LLDPE)、中密度ポリエチレン樹脂(MD
PE)、高密度ポリエチレン樹脂(HDPE)、超高分
子量ポリエチレン樹脂(UHMWPE)等の各種ポリエ
チレン樹脂をはじめ、エチレン−エチルアクリレート共
重合体樹脂(EEA)、エチレン−酢酸ビニル共重合体
樹脂(EVA)等のエチレン系共重合体樹脂や、マレイ
ン酸変性ポリエチレン樹脂等の変性ポリエチレン樹脂等
を採用することができる。
Examples of the polyethylene resin include low density polyethylene resin (LDPE), linear low density polyethylene resin (LLDPE), and medium density polyethylene resin (MD).
PE), high-density polyethylene resin (HDPE), ultra-high molecular weight polyethylene resin (UHMWPE), and other polyethylene resins, ethylene-ethyl acrylate copolymer resin (EEA), ethylene-vinyl acetate copolymer resin (EVA) Ethylene-based copolymer resins such as, and modified polyethylene resins such as maleic acid-modified polyethylene resin can be adopted.

【0017】離型性樹脂層2の厚さは特に制限されるも
のではないが、紋様5の凹凸の深さなどに応じて適宜設
計すればよく、通例50〜200μm程度が適当であ
る。この離型性樹脂層2の中での中間層3及び表面層4
の厚さに関しては、表面層4が薄すぎると耐熱性や繰り
返し耐久性が不足し、一方中間層3が薄すぎると層間接
着強度が不足するので、中間層3と表面層4との厚みの
比率が35:65〜5:95の範囲内となる様に設計す
ることが望ましい。
The thickness of the releasable resin layer 2 is not particularly limited, but it may be appropriately designed according to the depth of the unevenness of the pattern 5, etc., and usually about 50 to 200 μm is suitable. The intermediate layer 3 and the surface layer 4 in the releasable resin layer 2
As for the thickness of the intermediate layer 3, if the surface layer 4 is too thin, heat resistance and repeated durability will be insufficient, and if the intermediate layer 3 is too thin, the interlayer adhesive strength will be insufficient. It is desirable to design the ratio within the range of 35:65 to 5:95.

【0018】基材シート1と離型性樹脂層2との積層方
法は特に制限されるものではないが、離型性樹脂層2に
おける中間層3を構成するポリエチレン系樹脂と、表面
層4を構成するホモポリプロピレン樹脂又はポリメチル
ペンテン樹脂とを、共押出法により積層状態で押し出す
と同時に、そのポリエチレン系樹脂面側を基材シート1
側に向けて積層する、共押出ラミネート法によるのが、
生産性や接着強度等の面で最も好適である。なおその
際、層間接着強度をさらに向上させるために、紙などの
基材シート1の積層面に予めアンカーコート剤の塗工な
どの易接着処理を施しておいてもよい。溶融状態で押し
出された離型性樹脂層2の中間層3面に、基材シート1
との積層前に、コロナ放電処理又はオゾン処理等の活性
化処理を施すことも有効である。但し、表面層4面は、
合成皮革の表皮層樹脂との離型性を維持するため、無処
理とするのが良い。
The method for laminating the base sheet 1 and the releasable resin layer 2 is not particularly limited, but the polyethylene resin constituting the intermediate layer 3 in the releasable resin layer 2 and the surface layer 4 are A homopolypropylene resin or a polymethylpentene resin constituting the composition is extruded in a laminated state by a coextrusion method, and at the same time, the polyethylene resin surface side thereof is the base sheet 1
By the coextrusion laminating method, which is laminated toward the side,
Most preferable in terms of productivity and adhesive strength. At that time, in order to further improve the inter-layer adhesive strength, an easy-adhesion treatment such as application of an anchor coating agent may be previously applied to the laminated surface of the base material sheet 1 such as paper. On the surface of the intermediate layer 3 of the release resin layer 2 extruded in the molten state, the base sheet 1
It is also effective to carry out an activation treatment such as a corona discharge treatment or an ozone treatment before stacking with. However, the four surface layers are
In order to maintain the releasability of the synthetic leather from the skin layer resin, it is preferable that no treatment is performed.

【0019】離型性樹脂層2を基材シート1の両面に設
ける場合には、まず基材シート1の片面側に共押出法等
の適宜の積層方法により一方の離型性樹脂層2を設けた
後、再度基材シート1の反対面側に共押出法等の適宜の
積層方法により他方の離型性樹脂層2を設ける方法によ
ることも可能であるし、2台の押出機を用いて、一連の
工程内で基材シートの両面に片側ずつ順次離型性樹脂層
2を設けたり、基材シート1の両側から同時に樹脂を押
し出して両側の離型性樹脂層2を同時に積層形成したり
することも可能である。
When the releasable resin layer 2 is provided on both sides of the base sheet 1, one releasable resin layer 2 is first formed on one side of the base sheet 1 by an appropriate laminating method such as a coextrusion method. After being provided, it is also possible to provide the other releasable resin layer 2 on the opposite surface side of the base material sheet 1 again by an appropriate laminating method such as a coextrusion method, or using two extruders. Then, the release resin layers 2 are sequentially provided on both sides of the base sheet one by one in a series of steps, or the release resin layers 2 on both sides are simultaneously laminated by extruding the resin from both sides of the base sheet 1 at the same time. It is also possible to do.

【0020】離型性樹脂層2の表面への紋様5の付与方
法としては、基材シート1上に離型性樹脂層2を積層し
た後に、エンボス版又はエンボスロール等を使用した熱
圧エンボス法によって賦型する方法によることも可能で
あるし、基材シート1上に離型性樹脂層を共押出法によ
り積層する際に、基材シート1とエンボスロール又は賦
型シートとの間に離型性樹脂層2用の溶融樹脂を押し出
すことにより、離型性樹脂層2の形成と同時にその表面
に紋様5を賦型する方法によることも可能である。
The pattern 5 is applied to the surface of the releasable resin layer 2 by laminating the releasable resin layer 2 on the base material sheet 1 and then using hot embossing using an embossing plate or an embossing roll. It is also possible to use a method of applying a mold by a method, or when the releasable resin layer is laminated on the base material sheet 1 by the coextrusion method, it is placed between the base material sheet 1 and the embossing roll or the shape forming sheet. It is also possible to use a method in which the pattern 5 is formed on the surface of the releasable resin layer 2 at the same time as the releasable resin layer 2 is formed by extruding the molten resin for the releasable resin layer 2.

【0021】[0021]

【実施例】以下に、本発明の具体的な実施例及び比較例
を示し、本発明をより詳細に説明する。
EXAMPLES The present invention will be described in more detail below by showing specific examples and comparative examples of the present invention.

【0022】<実施例1>基材シートとしての坪量50
g/m2の紙の片面に、表面層としての融点165℃の
ホモポリプロピレン樹脂と、中間層としての融点125
℃の低密度ポリエチレン樹脂とを、厚みがそれぞれ80
μm及び20μmとなるように、押出温度230℃で押
し出し、その中間層側を基材シート側に向けて積層する
と同時に、抽象柄の紋様を施した冷却ロールを用いるこ
とにより、表面層の表面に紋様を付与し、中間層及び表
面層の2層からなる離型性樹脂層を形成した。しかる
後、出来た積層物の裏面(紙面)に対して、上記と同様
にして中間層及び表面層の積層及び紋様の付与を行っ
て、本発明の離型シートを作製した。
<Example 1> 50 basis weight as a base material sheet
A homopolypropylene resin having a melting point of 165 ° C. as a surface layer and a melting point of 125 as an intermediate layer are provided on one surface of a g / m 2 paper.
℃ low density polyethylene resin, the thickness of each 80
It is extruded at an extrusion temperature of 230 ° C. so that the thickness becomes 20 μm and the intermediate layer side is laminated toward the base material sheet side, and at the same time, by using a cooling roll having an abstract pattern, the surface of the surface layer is formed. A pattern was applied to form a releasable resin layer consisting of two layers, an intermediate layer and a surface layer. Thereafter, on the back surface (paper surface) of the resulting laminate, the intermediate layer and the surface layer were laminated and a pattern was imparted in the same manner as above to prepare a release sheet of the present invention.

【0023】<実施例2>上記実施例1において、基材
シートを厚さ70μmのポリプロピレン樹脂フィルムに
変更し、その他は上記実施例1と同一の要領にて本発明
の離型シートを作製した。
Example 2 The release sheet of the present invention was produced in the same manner as in Example 1 except that the base material sheet in Example 1 was changed to a polypropylene resin film having a thickness of 70 μm. .

【0024】<実施例3>上記実施例1において、基材
シートを厚さ30μmのポリエチレンテレフタレート樹
脂フィルムに変更し、その他は上記実施例1と同一の要
領にて本発明の離型シートを作製した。
<Example 3> In the above Example 1, the base sheet was changed to a polyethylene terephthalate resin film having a thickness of 30 μm, and otherwise the release sheet of the present invention was produced in the same manner as in Example 1 above. did.

【0025】<実施例4>上記実施例1において、基材
シートの裏面側への離型性樹脂層の形成を省略し、その
他は上記実施例1と同一の要領にて本発明の離型シート
を作製した。
<Example 4> In Example 1, the formation of the releasing resin layer on the back surface side of the base sheet was omitted, and the other steps were the same as in Example 1 except that the release of the present invention was performed. A sheet was prepared.

【0026】<実施例5>上記実施例1において、表面
層としての樹脂を融点240℃のポリメチルペンテン樹
脂に変更すると共に、該樹脂の押出温度を280℃と
し、その他は上記実施例1と同一の要領にて本発明の離
型シートを作製した。
<Example 5> In Example 1 above, the resin as the surface layer was changed to a polymethylpentene resin having a melting point of 240 ° C, and the extrusion temperature of the resin was changed to 280 ° C. The release sheet of the present invention was produced in the same manner.

【0027】<比較例1>上記実施例1において、中間
層を形成せずに表面層の厚みを100μmとし、その他
は上記実施例1と同一の要領にて離型シートを作製し
た。
Comparative Example 1 A release sheet was prepared in the same manner as in Example 1 except that the intermediate layer was not formed and the thickness of the surface layer was 100 μm.

【0028】<比較例2>上記実施例1において、表面
層及び中間層の厚みをそれぞれ50μmずつに変更し、
その他は上記実施例1と同一の要領にて離型シートを作
製した。
<Comparative Example 2> In the above-described Example 1, the thickness of the surface layer and the thickness of the intermediate layer were changed to 50 μm each,
Otherwise, a release sheet was produced in the same manner as in Example 1 above.

【0029】<比較例3>上記実施例2において、表面
層としての樹脂を融点145℃のランダムポリプロピレ
ン樹脂に変更し、その他は上記実施例2と同一の要領に
て離型シートを作製した。
<Comparative Example 3> A release sheet was prepared in the same manner as in Example 2 except that the resin used as the surface layer in Example 2 was changed to a random polypropylene resin having a melting point of 145 ° C.

【0030】<比較例4>上記実施例2において、中間
層としての樹脂を融点80℃の低密度ポリエチレン樹脂
に変更し、その他は上記実施例2と同一の要領にて離型
シートを作製した。
Comparative Example 4 A release sheet was prepared in the same manner as in Example 2 except that the resin used as the intermediate layer in Example 2 was changed to a low density polyethylene resin having a melting point of 80 ° C. .

【0031】<比較例5>上記比較例4において、基材
シートの裏面側の離型性樹脂層の形成を省略し、その他
は上記比較例4と同一の要領にて離型シートを作製し
た。
<Comparative Example 5> In Comparative Example 4, the release sheet was prepared in the same manner as in Comparative Example 4 except that the formation of the release resin layer on the back side of the base sheet was omitted. .

【0032】<性能比較>上記実施例1〜5及び比較例
1〜5の離型シートについて、基材シートと離型性樹脂
層との間での初期の層間接着強度、カールの有無、ポリ
ウレタン樹脂系合成皮革の製造(ポリウレタン樹脂の塗
工温度140℃)における繰り返し耐久性を評価したと
ころ、下表の通りであった。但し、層間接着強度は室温
(23.5℃)、剥離速度50mm/minの条件にお
けるT字型剥離強度であり、カールの有無は試作物10
cm×10cm大のものを常温で静置し、端部が重なり
合うものをカール有りと判定した。なお、繰り返し耐久
性は、下表には片面当たりの回数が掲載されており、基
材シートの両面に離型性樹脂層を有する実施例1〜3、
5、比較例1〜4の離型シートの繰り返し耐久性は、両
面を合わせればその2倍の回数となる。
<Performance Comparison> Regarding the release sheets of Examples 1 to 5 and Comparative Examples 1 to 5, initial interlayer adhesive strength between the base sheet and the release resin layer, presence of curl, polyurethane When the repeated durability in the production of resin-based synthetic leather (polyurethane resin coating temperature 140 ° C.) was evaluated, the results are shown in the table below. However, the interlayer adhesive strength is a T-shaped peel strength under the conditions of room temperature (23.5 ° C.) and a peeling speed of 50 mm / min.
A sample having a size of 10 cm × 10 cm was allowed to stand at room temperature, and a product having overlapping ends was determined to have curl. Incidentally, the repeating durability, the number of times per one side is listed in the following table, Examples 1-3 having a releasable resin layer on both sides of the substrate sheet,
5, the repeated durability of the release sheets of Comparative Examples 1 to 4 is twice as many when the both surfaces are combined.

【0033】 評価結果一覧 層間接着強度[N/m] カール 繰り返し耐久性 実施例1 紙層材破 無 >4回/片面 実施例2 1020 無 >4回/片面 実施例3 830 無 >4回/片面 実施例4 紙層材破 有 >4回 実施例5 紙層材破 無 >4回/片面 比較例1 200 無 使用不可 比較例2 紙層材破 無 1回/片面 比較例3 1020 無 1回/片面 比較例4 980 無 2回/片面 比較例5 980 有 2回 List of Evaluation Results Interlayer Adhesive Strength [N / m] Curl Cycling Durability Example 1 Paper Layer Material No Break> 4 Times / One Side Example 2 1020 No> 4 Times / One Side Example 3 830 No> 4 Times / Single-sided Example 4 Paper layer material broke> 4 times Example 5 Paper layer material broke> 4 times / single side Comparative example 1 200 No use Unusable Comparative example 2 Paper layer material broke 1 time / single side Comparative example 3 1020 None 1 No. of times / single sided Comparative Example 4 980 No. of times 2 times / one side of Comparative Example 5 980 Yes 2 times

【0034】但し、実施例4及び比較例5の離型シート
は、カールのために実際の合成皮革製造の生産性には問
題があり、上表における繰り返し耐久性はカールを強制
的に矯正した条件での試験結果である。また、比較例1
の離型シートは、合成皮革の剥離時に離型性樹脂層が基
材シートから剥離してしまうため、合成皮革の正常な剥
離が困難であり、比較例2及び比較例3の離型シート
は、繰り返し2回目において表面に皺又は艶ムラの発生
が認められ、比較例4及び比較例5の離型シートは、繰
り返し3回目において離型性樹脂層の基材シートからの
浮き剥がれが認められた。
However, the release sheets of Example 4 and Comparative Example 5 had a problem in the productivity of actual synthetic leather production due to the curl, and the repeated durability in the above table forcedly corrected the curl. These are the test results under the conditions. Comparative Example 1
In the release sheet of No. 3, since the release resin layer is peeled off from the base material sheet when the synthetic leather is peeled off, it is difficult to normally peel off the synthetic leather, and the release sheets of Comparative Examples 2 and 3 are The occurrence of wrinkles or uneven gloss was observed on the surface after the second repetition, and the release sheets of Comparative Example 4 and Comparative Example 5 were found to peel off from the base sheet of the release resin layer at the third repetition. It was

【0035】[0035]

【発明の効果】本発明の離型シートは、上述した通りの
構成により、共押出積層法等の簡便な方法で生産性良く
製造可能であり、しかも層間接着強度及び耐熱性の双方
に優れており、合成皮革製造用の離型シートとして優れ
た繰り返し耐久性を有するものである。特に、離型性樹
脂層を基材シートの両面側に設けると、表裏対称な層構
成なのでカールが発生しにくく、合成皮革製造時の作業
性が改善されると共に、繰り返し耐久性にもさらに優れ
たものとなる。
EFFECT OF THE INVENTION The release sheet of the present invention can be produced with a high productivity by a simple method such as the coextrusion laminating method due to the constitution as described above, and is excellent in both interlayer adhesion strength and heat resistance. Therefore, it has excellent repetitive durability as a release sheet for producing synthetic leather. In particular, when the releasable resin layer is provided on both sides of the base sheet, curling is less likely to occur because the layer structure is symmetrical on the front and back, workability during synthetic leather production is improved, and repeat durability is even better. It becomes a thing.

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

【図1】本発明の離型シートの実施の形態を示す側断面
図である。
FIG. 1 is a side sectional view showing an embodiment of a release sheet of the present invention.

【図2】本発明の離型シートの実施の形態を示す側断面
図である。
FIG. 2 is a side sectional view showing an embodiment of a release sheet of the present invention.

【図3】本発明の離型シートの実施の形態を示す側断面
図である。
FIG. 3 is a side sectional view showing an embodiment of a release sheet of the present invention.

【符号の説明】[Explanation of symbols]

1・・基材シート 2・・離型性樹脂層 3・・中間層 4・・表面層 5・・紋様 1 ... Base material sheet 2 ·· Releasable resin layer 3 ... Middle class 4 ... Surface layer 5 ... Pattern

───────────────────────────────────────────────────── フロントページの続き (72)発明者 鈴木 仁 東京都台東区台東1丁目5番1号 凸版印 刷株式会社内 Fターム(参考) 4F100 AK04B AK06 AK07C AK08C AR00B AR00C AT00A BA03 BA06 BA07 BA10C BA25 DG10 EH20 GB90 HB21 JA04B JA04C JJ03 JL02 JL10 JL14 JL14B JL14C YY00B YY00C    ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor, Hitoshi Suzuki             1-5-1 Taito, Taito-ku, Tokyo Toppan stamp             Imprint Co., Ltd. F term (reference) 4F100 AK04B AK06 AK07C AK08C                       AR00B AR00C AT00A BA03                       BA06 BA07 BA10C BA25                       DG10 EH20 GB90 HB21 JA04B                       JA04C JJ03 JL02 JL10                       JL14 JL14B JL14C YY00B                       YY00C

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】基材シートの少なくとも片面に離型性樹脂
層が積層されてなる離型シートにおいて、前記離型性樹
脂層が基材シート側から順に、融点120℃以上のポリ
エチレン系樹脂からなる中間層と、融点160℃以上の
ホモポリプロピレン樹脂又はポリメチルペンテン樹脂か
らなる表面層とからなり、且つ前記中間層と前記表面層
との厚みの比率が35:65〜5:95であることを特
徴とする離型シート。
1. A release sheet in which a release resin layer is laminated on at least one surface of a base sheet, wherein the release resin layers are formed from a polyethylene resin having a melting point of 120 ° C. or higher in order from the base sheet side. And a surface layer made of a homopolypropylene resin or polymethylpentene resin having a melting point of 160 ° C. or higher, and the thickness ratio of the intermediate layer to the surface layer is 35:65 to 5:95. Release sheet characterized by.
【請求項2】前記離型性樹脂層が基材シートの両面に積
層されてなることを特徴とする請求項1に記載の離型シ
ート。
2. The release sheet according to claim 1, wherein the release resin layer is laminated on both sides of a base sheet.
JP2001299809A 2001-09-28 2001-09-28 Release sheet Pending JP2003103711A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001299809A JP2003103711A (en) 2001-09-28 2001-09-28 Release sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001299809A JP2003103711A (en) 2001-09-28 2001-09-28 Release sheet

Publications (1)

Publication Number Publication Date
JP2003103711A true JP2003103711A (en) 2003-04-09

Family

ID=19120494

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001299809A Pending JP2003103711A (en) 2001-09-28 2001-09-28 Release sheet

Country Status (1)

Country Link
JP (1) JP2003103711A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006264265A (en) * 2005-03-25 2006-10-05 Dainippon Printing Co Ltd Process release material
EP1964672A1 (en) * 2005-12-22 2008-09-03 Lintec Corporation Release sheet
JP2009279838A (en) * 2008-05-22 2009-12-03 Polyplastics Co Release sheet for manufacturing artificial leather and manufacturing method thereof
CN107234856A (en) * 2017-07-07 2017-10-10 昆山致信天城电子材料有限公司 A kind of release coiled material of use for synthetic leather and manufacturing process

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006264265A (en) * 2005-03-25 2006-10-05 Dainippon Printing Co Ltd Process release material
EP1964672A1 (en) * 2005-12-22 2008-09-03 Lintec Corporation Release sheet
EP1964672A4 (en) * 2005-12-22 2010-03-10 Lintec Corp Release sheet
JP2009279838A (en) * 2008-05-22 2009-12-03 Polyplastics Co Release sheet for manufacturing artificial leather and manufacturing method thereof
CN107234856A (en) * 2017-07-07 2017-10-10 昆山致信天城电子材料有限公司 A kind of release coiled material of use for synthetic leather and manufacturing process

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