CN101544056B - 聚合物膜拉伸方法 - Google Patents

聚合物膜拉伸方法 Download PDF

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CN101544056B
CN101544056B CN2009101277576A CN200910127757A CN101544056B CN 101544056 B CN101544056 B CN 101544056B CN 2009101277576 A CN2009101277576 A CN 2009101277576A CN 200910127757 A CN200910127757 A CN 200910127757A CN 101544056 B CN101544056 B CN 101544056B
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CN101544056A (zh
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青岛伸介
高桥操
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Fujifilm Corp
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    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/08—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique transverse to the direction of feed
    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
    • B29C41/30—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length incorporating preformed parts or layers, e.g. moulding around inserts or for coating articles
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5057—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like positioned between the surfaces to be joined
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/344—Stretching or tensioning the joint area during joining
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7371—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable
    • B29C66/73711—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable oriented
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7371—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable
    • B29C66/73711—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable oriented
    • B29C66/73712—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable oriented mono-axially
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0081—Shaping techniques involving a cutting or machining operation before shaping
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/483—Reactive adhesives, e.g. chemically curing adhesives
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being non-straight, e.g. forming non-closed contours
    • B29C66/2442—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being non-straight, e.g. forming non-closed contours in the form of a single arc of circle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29K2001/00—Use of cellulose, modified cellulose or cellulose derivatives, e.g. viscose, as moulding material

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  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

后面膜的前端部分重叠在前面膜的后端部分上以形成重叠部分并通过双面胶带连结到该前面膜的后端部分上。双面胶带在膜输送方向上的长度比重叠部分的长度短。双面胶带粘接到后端部分且与后边缘留出后空间，并且粘接到前端部分且与前边缘留出前空间。后空间在膜输送方向上的长度是第一区域的最大收缩或更大，所述第一区域是前端部分的重叠在后空间上的一部分。同样，前空间在膜输送方向上的长度是第二区域的最大收缩或更大。

Description

聚合物膜拉伸方法
技术领域
本发明涉及一种聚合物膜拉伸方法。
背景技术
为了制造一种在光学应用中使用的聚合物膜，流延模将涂料(dope)流延到流延支撑部上以制作流延膜。将流延膜从流延支撑部上剥离下来并干燥成为膜。然后，将膜绕着卷绕轴卷绕成卷。这就是称为溶液流延方法的膜制造方法。使用酰化纤维素作为聚合物使用，而三乙酰基纤维素(TAC)是一种酰化纤维素。
日本专利公开出版物第2002-311240号公开了为了改进平滑度、机械强度、光学特性等，拉伸通过单独地由溶液流延线建立的离线拉伸线由溶液流延设备制造的TAC膜(此后称为离线拉伸)。
为了有效地离线拉伸，如在日本专利公开出版物第2002-311240号中所公开，优选连续拉伸膜。因此，当多个膜卷经过离线拉伸时，由膜卷供给的膜的前端重叠在从前面的膜卷供给的另一个膜的后端上，并且重叠部分通过双面胶带连结在一起。
然而，在宽度方向上拉伸TAC膜将产生颈缩现象，在该现象中，尽管由拉幅机夹持的TAC膜的两个横向端部几乎不收缩，然而TAC膜在宽度方向的中间部分在膜输送方向上显著收缩。在重叠部分中，在TAC膜和双面胶带中均出现颈缩现象。TAC膜比双面胶带收缩得更显著，使得胶带经常在拉伸后从重叠部分中露出。胶带的露出使得粘合剂粘附到输送器辊等上，造成频繁出现输送问题。另一方面，可以想到，重叠部分在膜输送方向上的长度要制作的比胶带的长度更大以防止胶带的露出。然而，在此情况下，重叠部分的未连结部分趋向于钩到输送机辊等上，并造成另外的输送问题。
发明内容
本发明的一个目的是提供一种用于有效地使TAC膜受到离线拉伸且可防止胶带露出的方法。
为了实现以上目的，根据本发明的聚合物膜拉伸方法包括步骤：通过夹住聚合物膜带的两个横向端，在膜的宽度方向上拉伸聚合物膜带；以及在拉伸步骤之前，通过将后面膜的前端部分重叠在前面膜的后端部分上，用双面胶将前面膜和后面膜连结成聚合物膜带。双面胶带在膜输送方向上的长度比后端部分和前端部分在输送方向上的长度短。将双面胶带粘接到后端部分并与后边缘留出后空间。将双面胶带粘接到前端部分并与前边缘留出前空间。后空间在输送方向上的长度大于第一区域在沿膜宽度方向拉伸聚合物膜带中在膜输送方向上的收缩，所述第一区域为前端部的重叠在后空间上的一部分。前空间在膜输送方向上的长度大于第二区域在沿膜宽度方向拉伸聚合物膜带中在膜输送方向上的收缩，所述第二区域为后端部分的上面重叠有前空间的一部分。
所述方法可以进一步包括在连结步骤之前确定第一区域和第二区域在膜输送方向上的收缩的步骤。
后空间和前空间中的每个都可以修整为凸起形状。
优选的是后空间和前空间中的每个在膜输送方向上的长度都在3mm和15mm之间或等于3mm和15mm。
聚合物膜可以由酰化纤维素制成。双面胶带可以具有包含聚酯的基带和设置在基带的两个表面上的粘接层。
根据本发明的聚合物膜拉伸方法，双面胶带在膜输送方向上的长度比后端部分和前端部分的长度短。双面胶带粘接到后端部分且与后边缘留出后空间，并且粘接到前端部分且与前边缘留出前空间。后空间和前空间在输送方向上的长度大于第一区域和第二区域在沿宽度方向拉伸聚合物膜带中在输送方向上的收缩。因此，当完成拉伸过程后，双面胶带不会在重叠部分中露出。因此，本发明能够连续和有效地使TAC膜受到离线拉伸，并可防止出现输送问题等。
附图说明
本领域的普通技术人员参照相应的附图进行的以下详细说明容易理解本发明的上述目的和优点，其中：
图1是离线拉伸设备(off-line stretching apparatus)的示意图；
图2是拉幅机的俯视平面图；
图3是夹子的侧视图；
图4是连结过程的说明图；
图5A是根据第一实施例的拉伸过程之前的重叠部分的俯视平面图；
图5B是根据第一实施例的拉伸过程之后的重叠部分的俯视平面图；
图6A是根据第二实施例的拉伸过程之前的重叠部分的俯视平面图；以及
图6B是根据第二实施例的拉伸过程之后的重叠部分的俯视平面图。
具体实施方式
参照图1，用于拉伸TAC膜3的离线拉伸设备2由膜供给室4、拉幅机5、散热室6、冷却室7和卷绕室8组成。膜供给室4容纳在溶液流延设备中制造的一卷TAC膜3，并将TAC膜3通过供给辊9供给到拉幅机5。
如图2所示，当B方向表示膜宽度方向时，夹子15夹住供给到拉幅机5中的TAC膜3的两个B向端。加热TAC膜3并随着输送在B方向上拉伸该TAC膜。
如图1所示，储存器10设置在膜供给室4和拉幅机5之间。储存器10具有辊10以储备TAC膜3。TAC膜3在储存器10中绕成环并供给到拉幅机5中，且即使以后说明的连结过程需要一些时间也不会停止。
如图2所示，拉幅机5使TAC膜3经过拉伸过程，TAC膜3通过所述拉伸过程随着在膜输送方向A(此后称为A方向)的输送在B方向上被拉伸。拉幅机5设置有第一轨道11、第二轨道12以及由轨道11和12引导的第一和第二链条(环形链条)13和14。拉幅机5在内部保持是热的。拉幅机5在A方向上可以具有多个区域，且每个区域根据需要具有不同的膜加热状态。例如，拉幅机5可以在A方向上顺序具有预加热区域、加热区域和散热区域。
对于第一和第二链条13和14，许多夹子15以规则间隔连接。在保持TAC膜3的B向端的同时夹子15沿每个轨道11、12移动，使得TAC膜3在B方向上被拉伸。轨道11和12以这样一种方式设置，所述方式为使得TAC膜3在膜释放位置PB处的B向宽度Wb大于TAC膜3在膜夹住位置PA处的B向宽度Wa。在拉幅机5中的拉伸比100×Wb/Wa优选为100.5％到300％。
第一链条13在驱动链轮21和从动链轮23上环绕成环，第二链条14在驱动链轮22和从动链轮24上环绕成环。第一轨道11在链轮21和23之间引导第一链条13，而第二轨道12在链轮22和24之间引导第二链条14。驱动链轮21和22设置在拉幅机出口27处，而从动链轮23和24设置在拉幅机入口26处。
参照图3，夹子15由夹子本体31和轨道连接部分32组成。夹子本体31具有近似U形的框架33和挡板34。挡板34通过轴33a可旋转地连接到框架33。挡板34可在用于垂直夹住TAC膜3的关闭位置和图3显示的打开位置之间移动。在打开位置，接合头34a与夹子打开器40接触，而挡板34倾斜以释放TAC膜3。挡板34通常通过自重被偏置到关闭位置。
轨道连接部分32具有连接框架35和导向辊36到38。第一链条13或第二链条14连接到连接框架35。导向辊36到38与驱动链轮21或22的支撑面、第一或第二轨道11或12的支撑面等接触并旋转。因此，沿每个轨道11、12引导夹子15，而所述夹子不会从驱动链21、22和轨道11、12上脱落。
夹子打开器40设置在每个链轮21到24的周围。在拉幅机入口26处的从动轮23和24中，夹子打开器40恰好在膜夹住位置PA之前与夹子15的接合头34a接触。此接触将挡板34设定到打开位置，使得夹子15可以接收TAC膜3的B向端。一旦夹子15通过膜夹住位置PA，接合头34a就离开夹子打开器40，使得挡板34被设定成从打开位置到关闭位置。因此，夹子15在膜保持面33b和挡板底面34b之间抓住TAC膜3的B向端。在设置在拉幅机出口27处的驱动链轮21和22中，夹子15的接合头34a以类似的方式在膜释放位置PB处与夹子打开器40接触。此接触将挡板34设置到打开位置。因此，夹子15释放TAC膜3的两个B向端。
如图4所示，膜供给室4执行膜连结过程，所述膜连结过程将从前面的膜辊供给的TAC膜(前面膜)3a连结到从新的辊供给的另一个TAC膜(后面膜)3b，以便在拉幅机5中连续拉伸TAC膜3。在连结过程中，后面膜3b的前端部分重叠在前面膜3a的后端部分上并通过由Nitto Denko公司制造的第532号双面胶带55连结。双面胶带55具有基带和设置在基带的两个表面上的粘接层。
优选的是双面胶带55即使在完成拉伸过程后也保持两个膜3a和3b连结在一起。基带由在膜3a和3b拉伸后不会撕裂的材料制作。基带也可以由聚酯或包含聚酯的材料制作。另外，也可以采用没有基带的另一种双面胶带。粘接层在拉伸过程中可以保持在两个膜3a和3b之间的粘合剂，并且可以包括例如丙烯酸或硅酮的粘合剂。
参照图1，TAC膜3经过拉幅机5中的拉伸过程，然后被送到边缘剪切机44。边缘剪切机44剪切TAC膜3的两个B向端。然后，切割鼓风机45切割剪切的端部条带以切割成小块。未显示的鼓风机将切割的块吹进破碎机46，破碎机46将块粉碎成碎片。由于碎片作为用于制备涂料的材料再生使用，所以此方法具有成本优点。
然后，将TAC膜3送到散热室6中。散热室6设置有多个辊47。TAC膜3随着通过加热释放在辊47的上方被输送并送到冷却室7。在散热室6中，鼓风机(未显示)吹送所需温度的暖空气。空气的温度优选20℃到250℃。
将热释放后的TAC膜3冷却到30℃或更低，然后送到卷绕室8。卷绕室8具有卷绕辊48和压辊49。卷绕辊48卷起TAC膜3，同时压辊49在该膜上施加压力。
接下来，将具体说明用于将前面膜3a的后端部分与后面膜3b的前端部分连结的连结过程。在连结过程中，如图4所示，重叠区域SA分配在前面膜3a的后端部分中。然后，双面胶带55胶合到重叠区域SA，以便使双面胶带55在A方向上的中间部分与重叠区域SA的中间部分近似对准。然后，将后面膜3b的前端部分覆盖在重叠区域SA上。如图5A所示，后面膜3b的前端部分通过连结过程重叠并粘接到前面膜3a的后端部分以形成重叠部分54。
双面胶带55的A向长度比重叠部分54的A向长度短。此外，双面胶带55在A方向上的中间部分近似与重叠部分54的中间部分对准。因此，在重叠部分54中在膜3a的后端处留下双面胶带55未粘附的后空间56a。同样，在膜3b的前端处留下前空间56b。后空间56a的A向长度为Ga，而前空间56b的A向长度为Gb。双面胶带55在A方向上的中间部分不是必须与重叠部分54的中间部分对准，只要在膜3a的后端处留有后空间56a且在膜3b的前端处留有前空间56b即可。
如图3所示，将连结膜3a和3b的TAC膜3供给到拉幅机5中。在拉幅机5中，夹子15夹住TAC膜3的两个B向端并在B方向上拉伸所述TAC膜。如图5B所示，在B方向上拉伸膜3a和3b使得所述膜在A方向上收缩。此时，由于夹子15夹住两个B向端，所以膜3a和3b在B向端处几乎不收缩。收缩随着在B方向上从端部靠近中间部分而增加并在中间处达到其最大值ΔLfa、ΔLfb。另一方面，与TAC膜3相比，双面胶带55在A方向上几乎不收缩。
在本发明中，后空间56a的A向长度Ga为ΔLfa或更大。前空间56b的A向长度Gb为ΔLfb或更大。因此，双面胶带55不会从拉伸的TAC膜3中露出。根据本发明，可以有效地拉伸TAC膜3，并且可防止输送问题等。
后空间和前空间56a和56b的A向长度Ga和Gb没有特定受到限制，只要完成拉伸过程后双面胶带55不从重叠部分54中露出，且TAC膜3a和3b的未胶合的后边缘和前边缘在输送TAC膜3中不钩到周边装置、构件等即可。长度Ga和Gb优选在3mm和15mm之间或等于3mm和15mm，而更优选地在5mm和10mm之间或等于3mm和10mm。
如图6A所示，膜3a的后边缘和膜3b的前边缘可以以凸起方式加工成在B方向上的中间部分突出的弧形。空间56a和56b的A向长度随着从B向端靠近中间部分而增加以补偿膜3a、3b的收缩。如图6B所示，拉伸过程使膜3a的后边缘和膜3b的前边缘变形为平直状。当完成拉伸过程后，这会最小化空间56a、56b，因此可以确保防止输送问题。
可以采用任何TAC膜3，只要该TAC膜已经由通常公知的溶液流延方法制造即可。例如，可以采用在日本专利公开出版物第2005-104148号中公开的TAC膜。将本发明应用到TAC膜，通过将包含TAC和溶剂的涂料流延到冷却的流延鼓的外周边表面上、当硬化以具有自支撑特性后剥离流延膜、通过针板拉幅机干燥、卷绕并储存制造所述TAC膜，从而有效并精益求精地将极佳的光学特性提供给TAC膜。
在本发明中，TAC膜3作为聚合物膜使用。然而，聚合物膜不局限于TAC膜3，且本发明可以应用到各种类型的聚合物膜上。

Claims (3)

1.一种用于在膜宽度方向上拉伸在一条线上输送的聚合物膜带的方法，所述方法包括以下步骤：
通过夹住所述聚合物膜带的两个横向端在所述膜宽度方向上拉伸所述聚合物膜带；以及
在所述拉伸步骤之前，通过将后面膜的前端部分重叠在前面膜的后端部分上，用双面胶带将所述前面膜和所述后面膜连结成所述聚合物膜带，所述双面胶带在膜输送方向上的长度比所述后端部分和所述前端部分在所述膜输送方向上的长度短，所述双面胶带粘接到所述后端部分且与后边缘留出后空间，所述双面胶带粘接到所述前端部分且与前边缘留出前空间，所述后空间在所述膜输送方向上的长度大于第一区域在沿所述膜宽度方向拉伸所述聚合物膜带中在所述膜输送方向上的收缩，其中所述第一区域为所述前端部分的重叠在所述后空间上的一部分，并且所述前空间在所述膜输送方向上的长度大于第二区域在沿所述膜宽度方向拉伸所述聚合物膜带中在所述膜输送方向上的收缩，其中所述第二区域为所述后端部分的重叠有所述前空间的一部分，
其中，所述方法还包括在所述连结步骤之前确定所述第一区域和所述第二区域在所述膜输送方向上的所述收缩；
所述后空间和所述前空间中的每个都修整为凸起形状；
所述前空间和所述后空间的在所述膜输送方向的长度随着从所述膜宽度方向端靠近中间部分而增加以补偿前膜和后膜的收缩。
2.根据权利要求1所述的方法，其中，所述后空间和所述前空间中的每个在所述膜输送方向上的长度都在3mm和15mm之间或等于3mm和15mm。
3.根据权利要求1所述的方法，其中，所述聚合物膜由酰化纤维素制成，所述双面胶带具有包含聚酯的基带和设置在所述基带的两个表面上的粘接层。
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