CN1365862A - 生产具有丝网施加的热熔胶粘剂涂层的柔性布料的方法和设备 - Google Patents
生产具有丝网施加的热熔胶粘剂涂层的柔性布料的方法和设备 Download PDFInfo
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Abstract
本发明涉及一种在主要用于服装加工的柔性布料例如机织织物、编织物或非机织织物上生产包含热熔胶粘剂的丝网涂层的方法和设备,通过丝网压印浆料而形成一防护层,然后,用一种热熔胶粘剂粉上粉,并除去未附着在浆料压印上的多余的粉,其特征在于,所述浆料被填充到一压花辊的凹槽中,或者从外部填充到一圆丝网模版的孔中,然后,几乎仅仅是这部分浆料填料被涂布到布料上,并即时与所述填料分离开。之后,用所述热熔胶粘剂粉上粉,并除去未附着在浆料压印上的多余粉,以及还包括一干燥和熔结工序。浆料从压花辊到涂层基片的转印是通过与背辊的接触实现的。第二种方法中,在填充丝网模版的孔的过程中,利用了模版外部的底平滑面,浆料仅仅是从外部填充所述孔,而没有浆料被压通过丝网模版的内侧。设置一内部刮刀,没有浆料孔,在位于丝网模版下方的一被涂橡胶的背辊的协助下,浆料被转印到涂层基片上。所得到的防护层和热熔胶粘剂层的双涂层实际上完全覆盖了基片的表面,需要非常少量的涂层同时能免于背面咬合,而且重量分布均匀。所需的胶粘剂量较少而且几乎不存在任何差异,因而,与迄今所知的所有涂层方法相比,降低了成本,获得了额外的柔度以及好的、甚至增强的粘附力。
Description
技术领域
本发明涉及一种生产具有丝网施加的热熔胶粘剂涂层的柔性布料(flexiblesheeting)的方法和设备。具有热熔胶粘剂的布料是基于主要用作服装定形的衬垫的机织织物、编织物或排机织织物。涂层是利用浆料而形成的一种防护层,通过用热熔胶粘剂粉上粉而形成印迹(imprint)。未附着在压印丝网(imprint screen)上的多余的粉,在涂层被干燥和熔结(sinter)之前被吹风机/抽吸装置除去。
技术背景
很长时间以来,一种通过将一层热熔胶粘剂粉上粉而具有糊状防护层的丝网涂层柔性布料已经为人们所熟知,主要是利用一圆丝网模版,由一内部刮刀给压印浆料(imprint paste)施加压力而使之穿过圆丝网模版的孔同时涂布到相同位置。在该印刷过程中,尤其是当布料是由薄基片形成时,一部分浆料主要是通过在机织织物或成圈网状物之间的空穴渗透到基片中,更多的或较少的浆料集中在基片衬背的浆料润湿部位和在圆丝网模版下的托辊处,结果,在安设位置(setting)有一种绷紧感(taut feel),这是不受人们欢迎的,同时,背面咬合(backingclinching)(在双安设位置插入衬背以相互粘附)不是总能避免的。
在专利EP0792581A1中描述了一种改进的双层方法,首先,提供一种具有丝网浆料压印的夹层基片,然后,将丝网浆料压印转印到布料上,之后,给被转印的浆状丝网层涂上热熔胶粘剂粉末。由于在转印湿润的浆料过程中,存在一种危险,即被挤压的丝网图案和残余浆料可能残留在夹层基片上,不可能得到整洁的丝网,比如,浆料未被转印到丝网的空隙中而弄脏丝网,同样,过度地导致一种绷紧感。
发明内容
因此,本发明的目的是提供一种方法和设备,同样允许在具有精密的隔离丝网和整洁的空隙的布料上涂布浆料状的丝网压印以形成一防护层,并用热熔胶粘剂粉末上粉,同时最佳地避免了一种绷紧感。另外,为了达到进一步降低成本和进一步减少绷紧感的目的,所需的胶粘剂的数量也比迄今所知的所有丝网涂层所需的胶粘剂量少很多,而且,对胶粘强度和耐洗性能没有损害,同时,也减少了在安设位置的背面咬合。
本发明的目的是通过一种涂布方法和一种生产设备实现的,用于生产具有一丝网施加的热熔胶粘剂涂层的布料,诸如机织织物、编织物或非机织织物,包括下列步骤:使用浆料以丝网印形成一防护层,然后,用一种热熔胶粘剂粉上粉,并除去未附着在浆料压印(paste imprint)上的多余的粉,其特征在于,浆料是通过使用一刮刀而涂布在一压花辊的凹槽中,或者通过使用一刮刀而涂布在一圆丝网模版的孔中,在后一种情况中,是用一具有钝角的刮刀接触被粘附有浆料的模版外表面,随后,仅仅是这部分浆料填料被涂布到布料上,并即时地与填料分离开,在施加压力的情况下没有渗入布料,然后,用一种热熔胶粘剂粉末上粉。在此生产技术中,所施浆料独特地被施加到涂层基片的表面,仅仅是轻微的渗透。如果完全渗透布料,据迄今所知,则会发生内部浆料涂层全部被除去的现象。被压印的浆料量远远小于、或最多等于相应的压纹或孔的体积数(孔体积=横截面积*产品厚度)。令人惊讶的是,已经发现,在各种情形下用于涂层所需的总量,比迄今所知的所有涂层方法所需的涂层量要少很多很多,但仍能获得好或甚至更好的胶粘性能及耐洗性能,同时也能消除在已知的浆料/上粉涂层中经常发生的背面咬合现象(在双安设位置嵌入背面相互粘附)。
在根据本发明的第一实施例中,一未被加热或者已被冷却的辊的压纹被用一刮刀填充浆料,刮刀通常设成锐角,然后,布料被一背辊(支承辊)压在所述压纹填料上,而所述背辊可以被加热或不被加热,所述压纹可以具有一被涂橡胶的或一平的钢表面。如此设计,一部分压纹填料被施加到布料的表面,涂布基片。剩余填料保存在压纹里,将被回收至填充位置以再填充。然后,具有浆料压印的涂层基片被均匀地以热熔胶粘剂粉末上粉,随后,通过用喷气机喷气或用真空吸气机吸气使基片表面晾干,结果,许多粉粒仍然粘附在湿润的丝网上,因而与之接触,并且部分与之粘固。最后未粘固的剩余粉末被用真空除去以循环利用。在已经离开所述吹气/吸气工位之后,整个涂层被干燥和熔结。
在根据本发明的第二实施例中,一外部平滑的底圆丝网模版被用刀来刮浆料,以便孔中能被从无到有地填充更多或较少的浆料,开始浆料不能被刮到丝网模版的内侧,或几乎不能。当浆料具有很高的粘度时以及当浆料刮刀以其约130°至170°的钝角接触丝网模版的外壁时,总是会发生这样的现象。在模版的垂直下方设置一背辊,该背辊或者是一被涂橡胶的抛光辊或者是一平整的钢辊。涂层基片被在模版与背辊之间的接触线上横向进给,背辊和设置在接触线上方的一内部刮刀被强迫推向模版却没有附加的浆料供应。这就导致,一部分浆料填充在丝网的孔内以便涂布到涂层基片表面,而没有渗透到基片中。旋转圆丝网模版至外部刮刀,孔就被重新填充。然后,印刷完的基片被上粉,用喷气或吸气晾干,干燥,熔结,这与第一实施例一样。
对第二实施例所述的涂层技术进行的最初测试没有这样的现象,在一试验涂层上,利用一钝角刮刀在一单一平面上接触丝网模版,部分的孔中浆料被涂布到涂层基片上,结果,没有或几乎没有任何上粉热熔胶粘剂被粘附到基片上。然而,令人惊讶地发现,在生产技术条件下,孔中浆料的转印发生了,直到一恒定的涂层量恰好平衡,在圆丝网模版转动几转之后就形成了涂层。
附图说明
图1示出本发明的生产设备,
图2示出本发明的生产装置,
图3示意地示出涂层布料的涂层的细节,
图4示出填充于一丝网模版的孔中的浆料填料。
具体实施例
参见图1,示出的是一生产设备。该设备包括一压花辊1,一被涂橡胶的背辊2,一浆料刮刀3,一浆料给料装置4,在被涂布一丝网浆料压印6之前和之后的一涂层基片,以及一附加粉末涂层7。粉末8用于上粉,而吹风机和抽吸装置9用于完成浆料压印上的粉末涂布。随后设置的干燥和熔结装置未被显示。
参见图2,示出的是一生产装置,包括一圆丝网模版10,模版10的孔实际上是被一具有约130°至170°钝角24的刮刀11填充浆料直到模版的最高顶点。所述丝网模版的下部与一被涂橡胶的背辊12相接触,而背辊12也与被在接触线13上给料和出料的涂层基片14相接触。通过所述接触线,模版一一基片一一背辊一一刮刀17被驱动,而没有附加的内部浆料与模版接触,利用所述被涂橡胶的背辊的协助,实现大多数孔的转印,通过涂层基片以丝网浆料点(15)的形式填充浆料16。在图2中未示出的是随后设置的上粉、吸气和吹气以及干燥和熔结装置。
所涂布的浆料量能够被设置在刮刀11上游的浆料量控制。当出现大量浆料时,则在刮刀17的上游出现浆料的细小珠子。当浆料量较少时,则这样的细珠实际上或者全部消除。为了控制刮刀11上游的浆料量,可以设置一水平传感器(未示出)。参见图3,示出的是一更加详细的示意图,涂层布料包括一被涂布到表面的薄的丝网防护层18,和一热熔胶粘剂粉末的熔结层19。最后,参见图4,示出的是被填充于一丝网模版18的孔中的浆料填料20,填料在模版的外侧(22)和内侧23。
为了获得更好的丝网涂层,当利用所述方法和设备时,最好是使用点式丝网(spot screen)和薄基片;合适的点式丝网是17至30目和更多(目,应理解为在一等腰三角形的角排列所有孔,而沿直线测量所得到的孔数)。
防护层浆料可以是,共聚酰胺、共聚多酯、聚亚安酯或者低压聚乙烯的高熔化/粘性的精细的热熔胶粘剂粉末的含水增稠物,还包括聚亚安酯分散剂,交联聚甲基丙烯酸酯分散剂,PVC粉末和PVC增塑剂。
需要阐明的是,浆料粘度相对较高,可以在15000至25000cP的范围内。所述用于上粉的热熔粉末应该具有一在80至最大120□m范围的粒度,可以由低熔化/粘性的共聚酰胺、共聚多酯、聚亚安酯或者聚乙烯组成。
以下是本发明的两个基本实例。
实例一:
压花辊及被涂橡胶的背辊
—均冷却
—压纹凹槽密度:80/cm2
—压纹凹槽深度:0.27mm
—压纹深度:0.18mm
浆料组成成分
—PVC加增塑剂1∶1∶10%
—干燥残渣,交联聚甲基丙烯酸酯3.5%
—干燥残渣,添加剂1%
—干燥残渣,增稠剂2%
—余量的水
浆料粘度:15000-25000cP
热熔胶粘剂粉末:低熔共聚酰胺粉末80-160□m
涂层基片:具有织构化的聚酯纱的编织物25g/m2
涂层重量:总重5.0g/m2,其中,防护层约1g/m2,热熔胶粘剂约4.0g/m2
涂层误差:+/-0.5g/m2(样品100cm2)
粘合强度(在连续物料处理量压力、127℃、设定间隙的条件下,聚酯的套衫外部材料):好于13N/5cm
实例二:
底丝网模版、150°钝角的外部刮刀及被涂橡胶的背辊
—模版孔密度:80/cm2
—孔直径:0.30mm
—底丝网的壁厚:0.19mm
—在连续操作状态孔的排空(perforation drain):约全部孔体积的60%(体积=孔横截面积*底丝网的壁厚)
浆料组成成分:同上
浆料粘度:同上
涂层误差:同上
热熔胶粘剂粉末:同上
涂层基片:同上
涂层重量:同上
粘合强度:同上
Claims (10)
1.一种在主要用于服装加工的柔性布料例如机织织物、编织物或非机织织物上生产包含热熔胶粘剂的丝网涂层的方法,包括以下步骤:用浆料以丝网压印形成一防护层,然后,用一种热熔胶粘剂粉上粉,并除去未附着在浆料压印上的多余的粉,其特征在于,所述浆料是通过使用一刮刀而涂布在一压花辊的凹槽中,或者通过使用一刮刀而涂布在一圆丝网模版的孔中,在后一种情况中,所述刮刀是以一钝角部接触被粘附有浆料的所述模版的外表面,随后,仅仅是这部分浆料填料被涂布到布料上,并即时与所述填料分离开,在使用一背辊施压时未渗入所述布料,然后,用所述热熔胶粘剂粉末上粉。
2.根据权利要求1所述的方法,其特征在于:所述浆料被填充于一未被加热的压花辊的凹槽中,然后,所述浆料被一未加热的被涂橡胶的背辊转印到所述布料上。
3.根据权利要求1所述的方法,其特征在于:所述浆料被填充于一已被冷却的压花辊的凹槽中,然后,所述浆料被一加热的钢表面背辊转印到所述布料上。
4.根据权利要求1-3任一项所述的方法,其特征在于:所述背辊将所述涂层基片压在所述压花辊上。
5.根据权利要求1所述的方法,其特征在于:所述浆料通过一外部刮刀被填充于所述丝网模版的孔中,所述刮刀以其约130°至170°的钝角设置在所述圆丝网模版的外部平滑底表面,以便它能大概地填充至所述孔的最大体积(=横截面积*模版壁厚)。
6.根据权利要求1和5所述的方法,其特征在于:所述浆料通过设置在所述丝网模版内的一内部刮刀的接触压力而被转印到所述布料上,但没有供给内部浆料。
7.根据权利要求1-6任一项所述的方法,其特征在于:所述浆料的粘度高,大约在15000至25000cP的范围内。
8.根据权利要求1-7任一项所述的方法,其特征在于:所述浆料包括PVC、PVC增塑剂和交联聚甲基丙烯酸酯。
9.一种实现权利要求1-8任一项所述方法的设备,设有一浆料压印装置,所述压印装置包括一压花辊,用于接触一被涂橡胶的或非被涂橡胶的背辊,一供应所述浆料的装置,用于将所述涂层基片供给到压花辊与背辊之间的压印区,向前运送所述基片至一上粉机下,以涂布所述热熔胶粘剂粉末,之后,设置一吹风/吸气设备及一干燥/熔结装置。
10.一种实现权利要求1-8任一项所述方法的设备,设有一浆料压印装置,所述压印装置包括一圆丝网模版,在模版外部有一平滑表面,一外部刮刀以其约130°至170°的钝角设置在所述圆丝网模版的外部平滑底表面,及一外部浆料供给装置,一内部刮刀,没有供给内部浆料,以及一背辊,背辊在与所述内部刮刀的边缘的接触线上和所述丝网模版接触,之后,设置一吹风/吸气设备及一干燥/熔结装置。
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EP (1) | EP1223244A3 (zh) |
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- 2001-07-17 CN CN01141016A patent/CN1365862A/zh active Pending
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- 2001-07-18 KR KR1020010043211A patent/KR20020061466A/ko not_active Application Discontinuation
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CN115350861A (zh) * | 2022-07-19 | 2022-11-18 | 南通欣天水衬布有限公司 | 一种用于衬布的热熔胶粉点涂层装置及其涂层方法 |
CN115350861B (zh) * | 2022-07-19 | 2024-05-07 | 南通欣天水衬布有限公司 | 一种用于衬布的热熔胶粉点涂层装置及其涂层方法 |
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EP1223244A3 (de) | 2004-03-24 |
EP1223244A2 (de) | 2002-07-17 |
KR20020061466A (ko) | 2002-07-24 |
US20020094376A1 (en) | 2002-07-18 |
JP2002212874A (ja) | 2002-07-31 |
DE10101664A1 (de) | 2003-08-07 |
HK1047303A1 (zh) | 2003-02-14 |
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