CN112469566A - 可适形屏蔽膜 - Google Patents
可适形屏蔽膜 Download PDFInfo
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- CN112469566A CN112469566A CN201980048219.XA CN201980048219A CN112469566A CN 112469566 A CN112469566 A CN 112469566A CN 201980048219 A CN201980048219 A CN 201980048219A CN 112469566 A CN112469566 A CN 112469566A
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Abstract
本发明公开了一种使刚性膜构造热成形的方法。该方法包括:将刚性膜构造施用到模具;以及加热刚性膜构造直至该刚性膜构造适形于模具。刚性膜构造包括刚性聚合物膜层;光调节膜层;以及屏蔽膜层。屏蔽膜包含聚甲基丙烯酸甲酯(PMMA);并且屏蔽膜层接触模具的表面。
Description
背景技术
许多企业和其它组织使用由刚性膜的模制或热成形叠堆制成的外部标牌。用于热成形的刚性膜通常包含与其它基材(诸如聚碳酸酯)结合的聚氯乙烯(PVC)。一般来讲,使刚性膜热成形以形成标牌或其它刚性结构包括以下步骤:将膜或若干层合在一起的材料施用到模具的表面,加热模具,以及使用真空条件将膜牵拉至模具的表面。然后冷却模具,并且可将新形成的形状从模具中移除。
在一些情况下,模具的表面损坏其接触的层合材料的表面。当光调节(light-modifying)膜层(通常比层合至膜层的刚性聚合物基材薄得多)接触模具的表面时尤其如此。因此,可非常难以产生损坏所得热成形制品的高质量热成形结构,从而产生视觉缺陷和功能缺陷两者。
发明内容
本发明解决了与用于多种应用(包括照明标牌)的热成形刚性膜构造相关的问题。许多照明标牌具有凸形外表面,并且在标牌的凹形或内侧上具有光源。大量照明标牌也是彩色的或包括一些光调节特征部。通过将较薄的膜片层合到较厚刚性膜的一侧,然后使刚性膜构造热成形来实现该颜色或特征。通常优选的是将光调节膜层层合至刚性膜的将形成照明标牌的内部的一侧。因为在该构造中更耐用和更厚的刚性膜位于标牌的外部,所以该标牌具有改善的寿命和耐候性,并且与较薄的光调节膜可耐受的相比,可更好地耐受太阳、雨、热、雪和暴露。
然而,同时,当用“凸”模具(具有主要凸形特征部的模具)使刚性膜构造热成形而不是用“凹”模具(具有主要凹形特征部的模具)热成形时,热成形工艺通常更有效。这是因为与实现受热膜与凹形表面的精确贴合相比,将受热膜牵拉到凸形表面更容易。附加地,凹形模具可更易于在所得的热成形制品上留下模具表面人工痕迹。具有主要凹形特征部的模具维护以供重复使用也可为更昂贵的。
为了实现照明标牌的最佳热成形,颜色调节层将位于标牌的内部,并且主要凸形模具将用于使标牌热成形。然而,这需要较薄的颜色调节层与模具表面接触,这通常导致层损坏,从而导致成品中的视觉缺陷和功能缺陷。
本公开通过提供使刚性膜构造有效地热成形同时使对构造的光调节层的损坏最小化的优点来解决该问题。本公开还提供了一种通过允许使用模具来使具有增强的耐候性的刚性膜构造热成形的方法,其中刚性膜构造被热成形为模具的凸形表面。通过允许用户将刚性膜构造的所需部分直接抵靠模具的凸形表面定位,本公开还允许刚性膜构造相对于主要凸形模具的表面更容易地对准。符合本公开的刚性膜构造在热成形时还提供增加的耐久性,因为其允许刚性聚合物膜形成标牌的外部并暴露于天气和多种因素,从而保护其它层免于暴露。
在一种情况下,本公开提供了一种使刚性膜构造热成形的方法。该方法包括:将刚性膜构造施用到模具;以及加热刚性膜构造直至该刚性膜构造适形于模具。刚性膜构造包括刚性聚合物膜层;光调节膜层;以及屏蔽膜层。屏蔽膜包含聚甲基丙烯酸甲酯(PMMA);并且屏蔽膜层接触模具的表面。
在另一种情况下,本公开提供了一种用于在热成形工艺中使用的刚性膜构造,该刚性膜构造包括:刚性聚合物膜层;光调节膜层;以及屏蔽膜层聚甲基丙烯酸甲酯(PMMA)。该屏蔽膜层被配置成接触模具的表面;并且其中刚性膜构造在加热时适形于模具的形状。
在一些情况下,刚性聚合物膜层包含以下中的至少一种:聚碳酸酯、丙烯酸类、聚对苯二甲酸乙二醇酯和聚对苯二甲酸乙二醇酯二醇。
在一些情况下,该方法还包括向凸模具的与刚性膜构造相对的一侧施用真空的步骤。
在一些情况下,光调节膜层是乙烯基膜。
在一些情况下,光调节膜层还包括印刷油墨层。
在一些情况下,光调节膜层是半透明的。
在一些情况下,光调节膜层用作漫射体。
在一些情况下,屏蔽膜层是光学惰性的。
在一些情况下,屏蔽膜层由聚甲基丙烯酸甲酯组成。
在一些情况下,屏蔽膜层具有小于100微米的厚度。
在一些情况下,屏蔽膜层具有小于100微米的厚度。
附图说明
结合附图考虑以下具体实施方式可有助于更全面地理解本发明,其中:
图1示出了可用于符合本公开的热成形的刚性膜构造的横截面。
图2示出了适形于具有主要凸起特征部的模具的表面的刚性膜构造的剖视图。
图3示出了示例的评估标准中识别的缺陷。
图4A至图4C示出了针对层合材料和模具的实验设置的示意图。
图5A和图5B示出实施例1(E1)热成形结果。
图6A和图6B示出比较例1(CE1)热成形结果。
在不脱离本发明的范围的情况下,可以利用本文所示和所述这些实施方案并且可以进行结构上的变化。图未必按照比例绘制。图中使用的相似数字指代相似的部件。然而,在给定附图中使用数字来表示组件并非意图限制标记有相同数字的另一个附图中的组件。
具体实施方式
图1示出了可用于符合本公开的热成形的刚性膜构造100的横截面。刚性膜构造100包括刚性聚合物膜层110、光调节膜层120和屏蔽膜层130。在一些情况下,刚性膜构造100可以包括附加层,并且在一些情况下,光调节膜层120和屏蔽层130可以是单个膜层。
刚性聚合物膜110可包括多种聚合物,诸如聚碳酸酯、丙烯酸类、聚对苯二甲酸乙二醇酯和聚对苯二甲酸乙二醇酯二醇或它们的任何组合。刚性聚合物膜110通常比光调节膜层120和屏蔽层130中的任一者厚,并且是刚性的,使得其无法被手动拉伸并且将基本上保持其形状,除非被加热至软化、熔融或流动温度并重新形成。刚性聚合物膜110可具有一定厚度范围。例如,刚性聚合物膜110可具有大约1mm、2mm、2.5mm、3mm、3.5mm、4mm或5mm的厚度,或在前述厚度中的任何两者之间的范围内的厚度。
刚性聚合物膜110可具有使刚性聚合物膜110热成形所必须达到的熔点或温度范围。例如,250F、275F、300F、325F、350F、375F、400F、425F或450F的温度或在两个前述温度中的任一个之间的范围内的温度可用于使刚性聚合物膜110或刚性膜构造100热成形。
在一些情况下,刚性聚合物膜110是透明的或光学惰性的,使得光调节膜120透过刚性聚合物膜100可见。
光调节膜120可为浇铸或压延的聚合物膜。光调节膜120可为乙烯基膜或非乙烯基膜。符合本公开的膜的类型的示例包括由多种聚合物或聚合物共混物制成的膜,包括聚氨酯、聚酯、聚酰胺、聚烯烃、聚苯乙烯、聚碳酸酯、聚丙烯酸酯、聚乙烯醇、聚乙烯醇缩丁醛、聚氯乙烯和含氟聚合物。符合本公开的可商购获得的膜包括具有ComplyTM粘合剂的180mC3MTM ControltacTM图形膜以及SV480mC 3MTMEnvisionTM印刷包装膜。
光调节膜120可具有影响入射到刚性膜构造100的光的透射(或反射)的多种特征部。例如,光调节膜120可为半透明的,可用作漫射体以改善光在由刚性膜构造100形成的标牌的整个表面上的分布。光调节膜120可被构造成包括诸如透镜或光提取特征部的特征部。光调节膜120可包括印刷油墨层。印刷油墨层可具有透过刚性膜110可见的单一颜色、图案或图像。印刷油墨层可通过多种方法印刷,包括喷墨、凹版印刷或丝网印刷。
光调节膜层120可具有一定厚度范围。例如,光调节膜层120可具有约25μm、50μm、75μm、100μm、125μm、150μm、175μm、200μm的厚度,或可具有在两个前述厚度值中的任一者之间的范围内的厚度。
屏蔽膜层130可由多种材料制成,但包含聚甲基丙烯酸甲酯(PMMA)。在一些情况下,屏蔽膜层130仅由PMMA组成。已发现PMMA在施用到或包括在刚性膜构造100中时具有异常且令人惊讶的有效保护特性,使得其保护光调节层120免受由与模具(具体地讲,具有凸形表面的模具)接触引起的损坏。
在一些情况下,屏蔽膜层130为光学惰性的,以使得其在到达和穿过光调节层120之前不会改变或影响光穿过屏蔽膜层130的透射。
屏蔽膜层130可以相对较薄。例如,在一些情况下,屏蔽膜层具有小于150微米、125微米、100微米、75微米或甚至50微米的厚度,或具有在两个前述厚度中的任一者之间的范围内的厚度。
刚性聚合物膜110、光调节膜120和屏蔽膜层130可以在每层之间使用压敏粘合剂层合在一起。例如,光调节膜120可在主侧面上具有粘合剂层(诸如压敏粘合剂),该粘合剂层由可移除衬垫覆盖。当形成刚性膜构造110时,可移除衬垫并且可将光调节层120粘附到刚性聚合物膜110。类似地,屏蔽膜130可以在一侧上具有粘合剂层,并具有覆盖粘合剂层的可移除衬垫。可以从屏蔽膜130上的粘合剂涂层移除衬垫,并且可以在与刚性聚合物膜110相对的一侧上将屏蔽膜130粘附到光调节膜120上。
在另一种情况下,可以通过卷对卷层合工艺将光调节膜120层合到屏蔽膜130上,然后可以将层合产品粘附或层合到刚性聚合物膜110。
图2示出了适形于与具有主要凸起特征部212的模具210的表面的刚性膜构造200的剖视图。在图2中,刚性膜构造200包括刚性聚合物膜220、光调节膜230和屏蔽膜240。刚性膜构造已被施用至模具210的表面,使得屏蔽膜240接触模具210的表面。模具210被加热并且刚性膜构造200软化,或者在一些情况下,由于加热而熔融或流动。在一些情况下,模具210可具有开孔,使得可将真空施用到模具的与施用刚性膜构造200的表面相对的表面。在那些情况下,真空随后抽吸软化的刚性膜构造以适形于并接触模具的表面。
实施例
制备具有和不具有屏蔽膜的膜层合物并使该膜层合物热成形。检查所形成的形状的缺陷。这些实施例仅为了进行示意性的说明,并非意在限制所附权利要求书的范围。在本文中使用以下缩写:in=英寸;cm=厘米;℃=摄氏度;℉=华氏度。
材料
测试方法
目测测试
使用标牌面灯箱评估热成形部件的视觉缺陷。设置灯箱中使用的白色LED,使得在99英寸2(639cm2)的表面区域上方,标牌面漫射体处的平均光出射率为2351勒。
过程:
1.目视评估热成形部件的背面(参见评价标准)。
2.热成形部件以正面朝外的方式放置在灯箱上。在反射光下对部件的正面进行视觉评估,反射光包括顶部、侧面和侧面下方的0.5英寸(1.27cm)的着陆区域(当热成形部件安装在标牌上时通常覆盖的平坦区域)以及顺维、横维和倾斜角度(参见评估标准)。
3.打开灯箱LED,并且屏蔽灯箱表面未被热成形部件覆盖的区域,以确保所有光均被阻挡。在透射光下评估部件的正面,包括顶部、侧面和侧面下方的0.5英寸(1.27cm)的着陆区域以及顺维、横维和倾斜角度(参见评估标准)。
4.如果观察到评估标准中的任一者,则热成形部件未通过目测测试。
5.评估标准:
i.裂纹、洞、气泡、皱纹、熔融、燃烧或包括污染在内的物理缺陷。
ii.热成形后由膜隆起引起的阴影、气泡或不均匀性。这包括半透明材料从基材隆起(气泡;由施用之前不适当的基材表面制备或模具未脱模而引起)和/或膜层之间的隆起(阴影;在膜构造内)。
iii.部件的顶部和侧面之间的颜色饱和度的不均匀性(即,顶部显得显著暗于侧面,侧面上为不规则颜色)。
每个评估标准在图3中示出。
实施例
使用3M热成形指令公告5.16(明尼苏达州圣保罗的3M公司)中规定的推荐热成形膜施用过程对所有基材进行干燥、清洁和施用。用于生成示例的模具由MDF(中密度纤维板)制成。模具形状为梯形截头,其基部为8英寸×8英寸(20.3cm×20.3cm),顶部为6.75英寸×6.75英寸(17.1cm×17.1cm),深度为2.25英寸(5.71cm)。模具的四个侧面被设计成使得可评估各种拔模斜度和边缘几何形状。侧面A和B的拔模斜度为6.4度,边缘半径为0.25英寸(0.64cm)。侧面C和D的拔模斜度为20度,边缘半径为9/32英寸(0.71cm)。当从顶部观察时,拐角中的一个拐角相对于模具的顶部表面以大约2英寸(5.08cm)的半径倒圆,同时携带20度的拔模斜度直至倒圆的基部。模具在图4A和图4B中示出。
图4C示出了层合层。与模具接触的膜为屏蔽膜层(所得热成形部件的背面)。基材位于层合物的最外表面(所得热成形部件的正面)上。
实施例1(E1)
使用用于膜施用的3M半透明热成形指令公告5.16(明尼苏达州圣保罗的3M公司)过程将B1、D1和T1层合到S1。然后将该构造置于模具的顶部,并在380℉-420℉(193℃-215℃)下热成形。评估E1并通过目测测试,并且成功保护D1和T1。E1不具有撕裂、气泡、燃烧或裂开缺陷,并且达到模具的基本上完全的可成形性或复制性。结果在图5和下表2中示出。
实施例2(E2)
使用E1中所用的相同工艺将B1、D2和T1层合至S1。该构造在380℉-420℉(193℃-215℃)下热成形。E2通过目测测试评估,并成功保护D2和T1。E2不具有撕裂、气泡、燃烧或裂开缺陷,并且达到模具的完全可成形性或复制性。结果示于下表2中。
实施例3(E3)
使用E1中所用的相同工艺将B2、D2和T1层合至S2。该构造在360℉-385℉(182℃-196℃)下热成形。评估E3并通过目测测试,并成功保护D2和T1。E3没有撕裂、气泡、燃烧或裂开缺陷,并且达到模具的完全可成形性或复制。结果示于下表2中。
实施例4(E4)
使用E1中所用的相同工艺将B2、D2和T1层合至S3。该构造在360℉-385℉(182℃-196℃)下热成形。对E4进行评估并通过目测测试,并成功保护D2和T1。E4不具有撕裂、气泡、燃烧或裂开缺陷,并且达到模具的完全可成形性或复制性。结果示于下表2中。
实施例5(E5)
使用E1中所用的相同工艺将B1和T1层合至S1。该构造在380℉-420℉(193℃-215℃)下热成形。评估E5并通过目测测试,并成功保护T1。E5不具有撕裂、气泡、燃烧或裂开缺陷,并且达到模具的完全可成形性或复制性。结果示于下表2中。
比较例1-无屏蔽膜(CE1)
使用E1中所用的相同工艺将D2和T1层合至S1。该构造在380℉-420℉(193℃-215℃)下热成形。CE1未通过目测测试。CE1具有撕裂、燃烧和裂开缺陷。结果在图6和下表2中示出。
表2:目测测试的实验结果
Claims (20)
1.一种使刚性膜构造热成形的方法,包括:
将刚性膜构造施用到模具;以及
加热所述刚性膜构造直至所述刚性膜构造适形于所述模具;
其中所述刚性膜构造包括:
刚性聚合物膜层;
光调节膜层;和
屏蔽膜层,
其中所述屏蔽膜包含聚甲基丙烯酸甲酯(PMMA);并且
其中所述屏蔽膜层接触所述模具的表面。
2.根据权利要求1所述的方法,其中所述刚性聚合物膜层包含以下中的至少一种:聚碳酸酯、丙烯酸类、聚对苯二甲酸乙二醇酯和聚对苯二甲酸乙二醇酯二醇。
3.根据权利要求1所述的方法,还包括向所述模具的与所述刚性膜构造相对的一侧施用真空的步骤。
4.根据权利要求1所述的方法,其中所述光调节膜层是乙烯基膜。
5.根据权利要求1所述的方法,其中所述光调节膜层还包括印刷油墨层。
6.根据权利要求1所述的方法,其中所述光调节膜层是半透明的。
7.根据权利要求1所述的方法,其中所述光调节膜层用作漫射体。
8.根据权利要求1所述的方法,其中所述屏蔽膜层是光学惰性的。
9.根据权利要求1所述的方法,其中所述屏蔽膜层由聚甲基丙烯酸甲酯组成。
10.根据权利要求1所述的方法,其中所述屏蔽膜层具有小于100微米的厚度。
11.一种用于在热成形工艺中使用的刚性膜构造,所述刚性膜构造包括:
刚性聚合物膜层;
光调节膜层;和
屏蔽膜层,所述屏蔽膜层包含聚甲基丙烯酸甲酯(PMMA);
其中所述屏蔽膜层被配置成接触模具的表面;并且
其中所述刚性膜构造在加热时适形于所述模具的形状。
12.根据权利要求11所述的刚性膜构造,其中所述刚性聚合物膜层包含以下中的至少一种:聚碳酸酯、聚对苯二甲酸乙二醇酯或丙烯酸类。
13.根据权利要求11所述的刚性膜构造,其中所述光调节膜层是乙烯基膜。
14.根据权利要求11所述的刚性膜构造,其中所述光调节膜层还包括印刷油墨层。
15.根据权利要求11所述的刚性膜构造,其中所述光调节膜层为半透明的。
16.根据权利要求11所述的刚性膜构造,其中所述光调节膜层用作漫射体。
17.根据权利要求11所述的刚性膜构造,其中所述屏蔽膜层为光学惰性的。
18.根据权利要求11所述的刚性膜构造,其中所述屏蔽膜层具有小于150微米的厚度。
19.根据权利要求11所述的刚性膜构造,其中所述屏蔽膜层具有小于100微米的厚度。
20.根据权利要求11所述的刚性膜构造,其中所述屏蔽膜层由聚甲基丙烯酸甲酯组成。
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US201862700524P | 2018-07-19 | 2018-07-19 | |
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PCT/IB2019/056037 WO2020016757A1 (en) | 2018-07-19 | 2019-07-15 | Conformable shielding film |
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EP (1) | EP3823827A4 (zh) |
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EP3917768A4 (en) | 2019-02-01 | 2022-10-26 | Racing Optics, Inc. | THERMOFORMED WINDSHIELD STACK WITH INTEGRATED MOLDABLE FOOT MOLD |
US11846788B2 (en) | 2019-02-01 | 2023-12-19 | Racing Optics, Inc. | Thermoform windshield stack with integrated formable mold |
WO2024019873A1 (en) * | 2022-07-19 | 2024-01-25 | Racing Optics, Inc. | Thermoform windshield stack with integrated formable mold |
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- 2019-07-15 JP JP2021502872A patent/JP2021530382A/ja active Pending
- 2019-07-15 WO PCT/IB2019/056037 patent/WO2020016757A1/en active Application Filing
- 2019-07-15 EP EP19837885.3A patent/EP3823827A4/en not_active Withdrawn
- 2019-07-15 US US17/260,646 patent/US20210394427A1/en active Pending
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JP2021530382A (ja) | 2021-11-11 |
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US20210394427A1 (en) | 2021-12-23 |
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