CN108284995A - 局部区域被覆方法和被覆装置 - Google Patents
局部区域被覆方法和被覆装置 Download PDFInfo
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- CN108284995A CN108284995A CN201810184719.3A CN201810184719A CN108284995A CN 108284995 A CN108284995 A CN 108284995A CN 201810184719 A CN201810184719 A CN 201810184719A CN 108284995 A CN108284995 A CN 108284995A
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Abstract
在杯状纸成型体(1)的贴合台阶部等局部喷镀粉体树脂而形成树脂隆起(8、9),从而提高纸成型体的密封性,并且,在微波炉加热时容易发生烧焦的局部区域形成含有防止烧焦物质的树脂被覆层(60)。局部区域处的树脂隆起是通过遮挡装置从罐体中间歇性地切出树脂粉体,并利用加压气体反复喷镀到局部区域而形成的。
Description
本发明专利申请是针对国际申请日为2015年5月29日、中国专利申请号为201580027343.X、发明名称为“纸成型体及局部区域被覆方法和被覆装置”的申请提出的分案申请。
技术领域
本发明涉及杯状纸成型容器等纸成型体及适合用被覆材料被覆该纸成型体的局部区域的局部区域被覆方法及被覆装置。
背景技术
作为饮食用的纸成型体有代表性的杯状纸成型体的开口卷边部因坯体两端缘的贴合而具有台阶,在主体部也形成有贴合部,在该贴合部的两端缘,纸端在杯内侧及外侧暴露出来。
在该杯状纸成型体中填充内容物并进行密封的情况下,在卷边部的上表面热封盖材。另外,在门店销售等填充后立即消耗的情况下,使顶盖嵌着卡合而进行销售。在热封盖材时,为了防止盖材的热粘接不良,通常将卷边部压平坦使其成为凸缘状而实现粘接面积的增大。该杯状纸成型体可用作直饮用容器,但是,如果在开口端部具有台阶部,则在口感上有不舒服的感觉,并且,压平坦的凸缘本身入口也会有不舒服的感觉。另外,在主体部的贴合位置,纸端缘暴露在成型体的内外,因此,存在特别是位于内侧的纸端缘直接与内容液接触而吸湿,使得容器的耐水性劣化的问题点。另外,在拉深纸成型体的情况下,在开口周缘的凸缘部产生褶皱,因此,存在在该凸缘面封装盖材的情况下不易确保密封性的问题点。
作为解决对坯体进行贴合成型而得到的纸成型体的上述问题点的方法,提出了:在现有坯体的对置的两端缘设置由层叠在基材片材上的热塑性树脂层构成的端缘延长片,并且,以一个端缘延长片在纸成型体的内侧且另一个端缘延长片在外侧的方式将两端部贴合,将各端缘延长片彼此进行热压接,以使基材片材的纸部分不会重叠(参见专利文献1)。另外,作为其它方法,提出了:以随着靠近端边而变薄的方式削掉成为内侧的侧缘部,贴合成为外侧的侧缘部而形成主体部贴合部及卷边贴合部,由此使得贴合部的台阶减小(参见专利文献2)。进而,作为另一方法,提出了:在开口部熔敷另行成型的树脂制加强环,由此,使开口部的卷边部处的台阶消失而使得密封性及口感性变好(参见专利文献3)。
另一方面,近年来,从环境负荷的观点考虑,以作为循环型资源的纸材为主体的纸成型容器备受关注,要求能够提高密封性而保存汤、饮料或者固体物质等内容物,且能够用微波炉进行加热的应对微波炉的纸成型容器。但是,在用微波炉对坯体具有贴合部的纸成型容器进行加热的情况下,微波容易集中在贴合部,在该部位产生容易发生烧焦的现象。特别是在具有环状支脚部的杯状的纸成型容器的情况下,存在容易在环状支脚部内周面发生烧焦的问题。
因此,提出有一种在防止现有微波炉加热时发生烧焦方面下了工夫的纸制容器(例如参见专利文献4-5)。但是,这些专利文献均变更了现有的杯状纸容器的底部形状,存在结构复杂且需要代替现有的生产线的新制造设备,使得成本提高的问题点。
另一方面,作为用树脂被覆现有纸成型容器等对象物的局部的方法,通常进行用热熔枪、热胶筒喷出熔融树脂而进行被覆的方法,但是,从喷嘴喷出后发生树脂的拉丝现象,因此,存在以下问题点:难以准确地被覆到狭窄区域,并且,浪费树脂,增加循环困难。另外,还有树脂溶液涂布、乳液涂布等湿式方法,但是,存在材料被限定,并且必须在涂布后使溶剂气化,溶剂的环境负荷也较高等问题点。进而,还提出了将熔融树脂以微粒状喷射到金属等对象物表面而形成被膜的方法,该熔融树脂是与射出成型机同样地对树脂原料进行加热,同时用螺杆挤出来熔融化而得到的(参见专利文献6)。该装置存在即便适合于在大型对象物的表面被覆树脂,也难以准确地间歇喷射微量的树脂,很难应用于在例如纸杯等的开口卷边部的台阶部形成少量的树脂隆起,并且,装置的小型化、高速化困难,且设备成本也较高等问题点。
另外,作为其它方法,还已知:利用喷镀枪以火焰喷镀将粘接性树脂粉末被覆在对象物表面,该火焰喷镀利用乙炔、丙烷等的火焰(参见专利文献7)。但是,在这种情况下,间歇处理、喷雾模式控制较困难,难以可靠地喷镀被覆到狭窄区域,并且,对象物、被覆树脂自身有可能因火焰而发生热劣化。
如上所述,目前,对于在输送线上被输送而在工业上大量生产的制品而言,可以说在狭窄的区域局部间歇性地准确且有效地形成树脂被膜的技术尚未确立。
专利文献
专利文献1:日本特开2005-14975号公报
专利文献2:日本特开2003-191941号公报
专利文献3:日本特开2002-264918号公报
专利文献4:日本特开2003-95352号公报
专利文献5:日本特开2005-88955号公报
专利文献6:日本特开平09-201833号公报
专利文献7:日本特开昭63-141666号公报
发明内容
关于现有的纸成型体,如所述专利文献1、2中所记载,以由热塑性树脂构成的端缘延长片形成贴合端部或者对纸端缘进行加工使其较薄而减小贴合台阶,存在加工难度高且不稳定、并且制造工序复杂的问题点,制造工序的高速化、效率化困难。另外,将作为另一部件的开口部加强树脂环热粘结于纸成型体,由于材料成本升高、且需要另行进行树脂环成型工序及熔敷工序,所以存在制造成本变高等问题点。
另外,对于在输送线上被输送而在工业上大量生产的纸成型体而言,可以说在纸成型体的狭窄的区域局部间歇性地准确且有效地形成以合成树脂为主体的树脂被膜的技术尚未确立。
因此,本发明的目的在于:提供能够在不经过复杂的工序的情况下简单地解决纸成型体的上述问题点,消除了具有开口部的纸成型体的密封性及由贴合部、褶皱的发生所引起的上述问题点的纸成型体及即使是在该纸成型体的狭窄的区域,也能够准确且高效地进行树脂被覆,并且,能够间歇性地反复进行树脂被覆的局部区域树脂被覆方法及其装置。
解决上述问题点的本发明的纸成型体以具有开口部的纸成型体为基础,其特征在于,通过在局部喷镀被覆材料而形成树脂隆起,所述被覆材料由以合成树脂为主体的粉体形成。
本发明的纸成型体可以构成为:所述局部为杯状纸成型体的开口部周缘的至少贴合台阶部,在该台阶部上形成树脂隆起而掩埋该台阶部。
另外,可以构成为:在所述局部为纸成型体的主体部的贴合台阶部的情况下,通过该台阶部上的树脂隆起来树脂被覆所述贴合部的纸端缘。
进而,可以构成为:在所述纸成型体为以纸为主体的拉深成型体的情况下,通过在开口凸缘面整周形成所述树脂隆起来被覆该开口凸缘面的褶皱。
另外,还可以构成为:所述树脂隆起是喷镀热粘接性树脂粉末而形成的,其被膜厚度在0.3mm以下。
在本发明的纸成型容器为应对微波炉加热的纸成型容器的情况下,在该纸容器的局部区域形成含有防止烧焦物质的树脂被覆层,由此,能够防止在微波加热时发生烧焦。
在杯状纸成型容器的情况下,所述局部区域为在微波炉加热时容易发生烧焦的环状支脚部内周面。
所述树脂被覆层是喷镀在树脂粉末中混有防止烧焦物质粉末的粉体而形成的,由此,能够用较少的被覆材料在规定位置有效地形成被覆层。
所述树脂粉末的种类没有限定,可以有效地采用粒径30~300μm的聚乙烯、聚丙烯等聚烯烃树脂粉末、PET、PEN、PLA、PBT等聚酯树脂粉末。
另一方面,作为防止烧焦物质粉末,可以采用廉价的低介电常数物质亦即碳酸钙、滑石。
解决上述课题的本发明的局部区域树脂被覆方法是利用以合成树脂为主体的被覆材料来被覆对象物的局部区域的被覆方法,其特征在于,将以合成树脂为主体的粉体间歇性地喷镀到所述局部区域。
关于所述喷镀,定量切出所述粉体,利用加压气体进行压送使其与加热气体合流,从而间歇性地喷镀到所述局部区域,由此,能够在对象物上反复地进行每次少量且定量的树脂被覆。
所述粉体的加热优选利用热风在所述合成树脂的熔点附近进行加热使其部分熔融。进而,对所述对象物的要被覆的局部区域进行预热,由此,不是在完全熔融的状态下喷射的树脂粉末在对象物的表面完全熔融而被覆对象物表面,因此,没有产生拉丝现象,能够增加间歇喷镀的循环,且能够提高被覆效率。
进而,解决上述课题的本发明的局部区域树脂被覆装置是利用以合成树脂为主体的被覆材料进行被覆的被覆装置,其特征在于,所述被覆材料为粉体,该局部区域树脂被覆装置包括:供给该粉体的罐体、与该罐体的下端连通的喷镀喷嘴、设置在所述罐体的下端开口部与所述喷镀喷嘴之间的定量切出遮挡装置,用所述定量切出遮挡装置从所述罐体中切出定量的粉体并使其与加热气体合流,由所述喷镀喷嘴进行喷镀。
所述定量切出遮挡装置可以采用以下构成:由横穿过所述罐体的出口开口部的旋转体构成,在该旋转体上设置有面对所述罐体的出口开口部的计量室,并且,具有与该计量室的气体供给口连通并向该计量室供给加压气体的阀门,所述旋转体能够在计量位置与喷镀位置之间进行间歇旋转,在计量位置,面对所述罐体的出口开口部而计量定量的粉体,在喷射位置,所述计量室面对所述喷镀喷嘴,从所述阀门向所述计量室供给加压气体而将所述粉体压送到所述喷镀喷嘴。
根据本发明,仅对纸成型体的局部实施树脂隆起,由此,无需对坯体基材实施特别的加工,就能够容易且以廉价的成本解决具有开口部的纸成型体的由贴合部、褶皱的发生所引起的问题点,能够得到密封性优异的纸成型体。
另外,将本发明应用于杯状纸成型体的开口周缘部的贴合台阶部而在该台阶部形成少量的树脂隆起,由此,能够使从该容器直饮内容物时的口感变好,并且,在热封盖材时该台阶部处的封口性提高,能够提高密封性,能够提供将纸成型体应用到可以常温保存内容物的密封容器的应用性。另外,能够有效地防止在该容器上盖上顶盖进行密封时从所述台阶部泄漏。
进而,将本发明应用到纸成型体的贴合部等暴露出来的纸端缘,能够有效地树脂被覆该暴露纸端缘,能够防止从暴露纸端缘吸收内容液等而提高耐水性。
进而,将本发明应用到以纸为主体的拉深成型体的开口凸缘面,由此,能够被覆凸缘的褶皱,能够提高热封盖材的热熔敷性而提高密封性。
将所述树脂隆起构成为喷镀热粘接性树脂的粉末而形成的平均被膜厚度在0.3mm以下,由此,没有拉丝,能够以较少的树脂材料有效地形成。
另外,在本发明的纸成型容器是应对微波炉加热的情况下,在其局部区域形成含有防止烧焦物质的树脂被覆层,由此,无需变更现有的纸成型容器的基本结构,就能够利用简单的方法容易地防止在微波加热时发生烧焦。
并且,在杯状纸成型容器的情况下,仅在环状支脚部内周面形成含有防止烧焦物质的树脂被覆层,无需变更现有的杯状成型容器的底部形状,就能够容易地防止发生烧焦。
进而,所述树脂被覆层是喷镀在塑料粉末中混有防止烧焦粉末的粉体而形成的,由此,能够在环状支脚部内周面可靠且廉价地形成防止烧焦层。作为所述防止烧焦物质粉末,采用相对介电常数2以下的无机物,由此,能够有效地形成防止烧焦层。
根据本发明的被覆方法,通过将以合成树脂为主体的粉体间歇性地喷镀到局部区域,即便是较小的面积,也能够准确且高效率地形成树脂被覆。
并且,通过间歇性地定量切出以合成树脂为主体的粉体进行喷镀,能够将熔敷效率高的、粒径小的材料喷镀到小面积上,能够以最小限度的使用材料高效率地形成树脂被覆,并且,能够实现高循环化。
进而,喷镀是以热风在合成树脂粉体的熔点附近对合成树脂粉体进行加热使其部分熔融,由此,在附着到对象物后熔融,因此,树脂的拉丝现象消失,能够准确地进行高速的间歇喷射。
并且,对对象物的树脂被覆的局部区域进行预热,由此,在熔点附近进行加热而在部分熔融的状态下喷镀的树脂粉体能够在局部区域有效地熔敷。
另外,将本发明的被覆方法应用到具有开口部的容器的开口卷边部的贴合台阶部,能够在该台阶部形成少量的树脂隆起,能够使从该容器直饮内容物时的口感变好,并且,能够提高在热封盖材时该台阶部处的封口性。另外,能够有效地防止在该容器上盖上顶盖进行密封时从所述台阶部泄漏。
进而,将本发明的被覆方法应用到纸制容器的重叠部等暴露纸端,能够有效地树脂被覆该暴露纸端,能够防止从暴露纸端吸收内容液等而提高耐水性。
另外,将本发明的被覆方法应用到刚性低的纸成型体,能够追加作为加强材料的局部隆起,能够提高成型体的刚性、保形性。
进而,例如在该粉体树脂中混合无机物等的粉末而将本发明的被覆方法应用到在用微波炉对纸制容器进行加热时容易发生烧焦的局部,由此,能够将该局部改性成不易发生烧焦。
本发明的被覆装置的构成简单,且能够小型化,能够容易且廉价地组装到通常的生产线中,并且,即便喷镀区域为小面积,也能够准确且间歇性地喷镀少量的粉体树脂,能够减少使用材料。
另外,本发明的被覆装置具备定量切出遮挡装置,由此,即便是少量的粉体树脂,也能够用简单的机构准确地计量,并且,能够间歇性地以高速进行。结果,还能够应用滑落性不足的、粒径小的粉体。
另外,使加热气体为热风,由此,能够不使用火焰进行喷镀,能够缓和热对对象物、被覆树脂自身的影响。
附图说明
图1是本发明的实施方式所涉及的纸成型容器的立体图及局部截面图。
图2是本发明的另一实施方式所涉及的纸成型容器的立体图。
图3是表示本发明的实施方式所涉及的被覆装置的主要部分及被覆方法的示意图。
图4是在图3所示的装置中向计量室压缩填充粉体时的示意图。
图5是在本发明的实施例1的层压原纸上形成了树脂隆起的照片。
图6是在本发明的实施例2的台阶部上形成了树脂隆起的台阶部的截面及上表面的照片。
图7示出本发明的实施方式所涉及的被覆方法的预热工序及喷镀工序。
符号说明:
1 杯状容器
2 主体部
3 开口卷边部
4 台阶部
5 主体部贴合部
6 纸端缘
7 环状支脚部
8、9、13 树脂隆起
10 拉深成型容器
12 凸缘面
14 褶皱
25 预热喷嘴
30 被覆装置
31 罐体
32 喷镀喷嘴
33 下端开口部
34 粉体供给装置
35 定量切出遮挡装置
36 旋转体
37 计量室
38 气体供给口
40 热风发生器
42 流路
43 供给管路
44 电磁阀
45 导入流路
46 喷射流路
52 折曲片
57 底板
58 环状弯曲部
60 无机物混合树脂层
70 试制层压原纸
71 树脂隆起
具体实施方式
以下,基于附图,对本发明所涉及的纸成型容器的实施方式详细地进行说明。
图1示出作为本发明的实施方式所涉及的纸成型体的杯状容器。关于该杯状容器1,将成为主体部2的扇形状的坯体的两端缘贴合粘接而成型为圆锥状,将其上端部卷边成型而作为开口端部,如图1(d)所示,将下端部B的台阶面向内侧折曲而形成折曲片52,在其间压接拉深成型为截面コ字形的底板57的环状弯曲部58而成为环状支脚部7,如图1(b)放大所示,在开口卷边部3的A部形成了坯体两端缘的贴合所产生的台阶部4。另外,在主体部形成了贴合部5,在该贴合部的两端缘,纸端在杯内侧及外侧暴露出来。以上的结构与现有众所周知的杯状纸成型容器相同。
在该杯状纸成型容器中,为了消除前述的开口部周缘的开口卷边部3上的台阶部4所导致的密封不良及作为直饮容器的口感不良,在本发明中,在台阶部喷镀少量的合成树脂而形成树脂隆起8,通过树脂来掩埋台阶。
在杯状纸成型容器的卷边部的台阶部4这样的狭窄的区域准确地形成树脂隆起比较困难,但是,在本实施方式中,通过利用图3中示意性示出的树脂喷镀装置间歇性地喷镀粉体树脂,能够在卷边部的台阶部4上良好地形成树脂隆起,无需对原纸端缘自身实施特别的加工,就能够利用简单的方法解决上述问题点。
另外,在本实施方式中,如图1(c)放大所示,沿着纸成型容器的主体部贴合部5的、特别是杯内表面侧的纸端缘6形成在上下方向上连续的树脂隆起9,树脂被覆暴露在内表面侧的纸端缘6。由此,纸端缘6不会直接接触到内容液,能够提高容器的耐湿性。应予说明,在本实施方式中,仅树脂被覆了贴合部的内侧纸端缘,但是,优选外侧也同样地进行树脂被覆。
该纸成型容器作为应对微波炉加热的容器,主体部坯体材料及底部件均以纸为主体,但是,为了在液状内容物中对内表面及外表面进行保护,可以采用层压或者涂布有聚烯烃树脂或聚酯树脂等的复合纸材、或含浸有聚烯烃树脂或聚酯树脂等的复合纸材、或者由根据需要在内层具有气体阻隔层的复合层构成的材料,只要是能够进行微波炉加热的材料,其材质就没有特别限定。
关于如上所述的杯状容器,在本实施方式中,如图1(d)所示,在微波炉加热时容易发生烧焦的环状支脚部7内周面的整周形成含有防止烧焦物质的树脂被覆层60,使得在微波炉加热时防止发生烧焦。关于该树脂被覆层,在本实施方式中,喷镀混合粒径30~300μm的合成树脂粉末和防止烧焦物质的粉末而得到的粉体,在环状支脚部7内周面形成树脂被覆层60。
作为本发明中所使用的粉末,不限定于以下材料,但是,使用针对以纸为主体的纸成型容器具有易粘接性的材料。通常的纸成型容器在作为基底的纸基材上涂布有树脂,从易粘接性这一点考虑,优选使用与表面树脂层同种的树脂或熔点比表面树脂层低的树脂。
此处,作为合成树脂,只要为热塑性树脂即可,没有特别限定,可以采用高-中-低密度聚乙烯、聚丙烯等聚烯烃、PET、PEN、PLA、PBT等聚酯树脂的一种或多种树脂粉末。另外,作为防止烧焦粉末物质,即相对介电常数较低的物质,可以采用例如碳酸钙、滑石等。由此,环状支脚部处吸收微波而引起的发热减少,能够防止发生烧焦。
关于在上述的局部区域形成含有防止烧焦物质的树脂被覆层,可以考虑利用热熔、热流道或者火焰喷镀等的方法。但是,对于像本实施方式这样涂布区域极窄且以少量的树脂在容器的高速生产线上形成,上述的任意一种方法均会产生涂布树脂的拉丝现象,因此,增加循环受到限制,并且,难以准确地涂布。为了克服这些问题,在本实施方式中,对于在生产线上被成型而输送的杯状形容器而言,作为后加工工序,设置预热工序和树脂喷镀工序,在预热工序中,向树脂涂布区域喷热风而将环状支脚部内周面预热至被覆树脂的熔点附近,接下来,在树脂喷镀工序中,向该部喷镀上述树脂粉体。树脂粉体的喷镀可以通过如下方式进行:以如上所述将粒径30~300μm的合成树脂粉末和防止烧焦物质的粉末混合所得到的粉体树脂粉末为原材料,利用将该原材料加热到树脂的熔融温度以下的加压加热气体(本实施方式中为热风),通过喷射喷嘴间歇性地或连续性地喷镀到环状支脚部内周面而形成树脂隆起。
以如上所述的方法在环状支脚部内周面进行树脂被覆,由此,不会产生拉丝现象而能够在规定的小区域准确地进行树脂被覆,能够使得使用材料为最小限度。
图2示出本发明的另一实施方式,在本实施方式中,在拉深成型容器10的凸缘面12上以覆盖因拉深成型而产生的凸缘面的褶皱14的方式在凸缘整周形成树脂隆起13(图2中示出进行至形成树脂隆起的中途的状态),在热封盖材时,该树脂热粘结而掩埋褶皱,从而盖材完全热粘结而使得密封性得到提高。
如上所述在纸成型容器的局部的狭窄的区域形成少量的树脂隆起会有树脂的拉丝,很难在短时间内仅在规定的局部高效率地形成树脂隆起,浪费树脂,但是,在本实施方式中,通过使用如下的树脂被覆装置来间歇性地喷镀粉体树脂,不会产生拉丝现象,能够在规定的小区域准确地进行树脂被覆,能够使得使用材料为最小限度。
以下,基于图3及图4,对能够在上述纸成型容器的局部准确地形成少量的树脂隆起的本发明的被覆方法及被覆装置的实施方式详细地进行说明。
对于本发明,作为能够以较少的树脂在对象物的较小的区域不会产生拉丝现象等地高速且可靠地进行树脂被覆的方法,在本发明中,定量地切出以合成树脂为主体的粉体,加热至合成树脂的熔点附近,间歇性地反复喷镀到局部区域。作为合成树脂粉体,根据由该合成树脂被覆的局部的用途、目的来选择树脂材料及其粒径,例如在杯的开口卷边部的台阶区域进行喷镀以便形成树脂隆起的情况下,采用聚乙烯等热封性树脂粉末,以便使台阶部消失而使口感变好,并且,与盖材热封而提高密封性。
图3示意性地示出用于将粉体树脂喷镀到局部区域的本实施方式所涉及的树脂被覆装置30的主要部分,在漏斗状的罐体31的下端开口部33隔着定量切出遮挡装置35而设置有喷镀喷嘴32。在罐体31上连接有向该罐体供给以树脂为主体的粉体的粉体供给装置34。另外,还可以设置用于根据需要将所供给的粉体树脂加热至规定温度的加热机构。作为加热结构,优选热风发生装置40。
定量切出遮挡装置35由横穿过罐体31的下端开口部33的旋转体36构成,在该旋转体36上设置有面对罐体31的下端开口部33且顶部直至旋转体36的大致中心轴线的圆锥状凹处的计量室37。并且,旋转体36的一端与间歇旋转驱动机构(未图示)连接,并且,沿着中心轴线具有一端与加压气体源连接的流路42,该流路与形成在计量室37的顶部的加压气体供给口38连通。在流路42上连接有与压缩机等压缩空气供给源连接的供给管路43,通过设置在该供给管路上的电磁阀44来控制向计量室37内送给加压气体的时机。旋转体36间歇性地半旋转,以计量室交替地位于粉体计量位置和向喷镀喷嘴压送的位置的方式进行控制。
由加热机构向喷镀喷嘴32供给加热气体。作为加热气体,优选热风,作为利用与压缩机等空气供给源连接的热风发生器40以电气或者气体燃烧等的加热方法被加热到规定温度的加热气体亦即热风被供给到喷镀喷嘴。
关于喷镀喷嘴32,在其顶部具有当旋转体36旋转到喷镀位置时接收来自计量室37的粉体树脂的导入流路45,在其下方形成有规定口径的喷射流路46。向喷射流路46供给加热气体,使从所述计量室压送而来的粉体与加热气体合流。当然,旋转体36以密封状态以能够旋转的方式连接在罐体31、定量切出遮挡装置35及喷镀喷嘴32之间,使得粉体不会泄露到外部。
本发明的粉体树脂的被覆装置如上构成,将粉体树脂如下这样喷镀到对象物的规定区域而进行树脂被覆。
首先,对对象物的树脂被覆预定区域进行预热。预热可以采用各种加热方法,并没有特别限定,但是,为了用简易且廉价的设备局部地进行加热,如图7(a)所示,优选从预热喷嘴25喷出热风来进行。另外,通过利用来自喷镀喷嘴的热风并使树脂的喷射延迟,也能够进行预热。通过对喷镀对象面进行预热,即便从喷镀喷嘴喷射出的树脂没有完全熔融,树脂也会良好地熔敷在对象物面,能够间歇性地以高速形成树脂被覆。
接下来,用上述被覆装置向被预热的对象物的局部区域喷镀粉体树脂而进行树脂被覆。关于利用上述装置喷镀粉体树脂,在图3(a)的状态下,向罐体31内供给粉体树脂,在该状态下向定量切出遮挡装置35的计量室37内自动地填充计量室的容积的量的粉末树脂。接下来,旋转体36旋转180゜,由此,如图3(b)所示。计量室37翻转而面对喷镀喷嘴32的导入流路45,同时,阀门44打开,加压空气经由加压气体供给口38被喷到翻转的计量室内,计量室内的定量的树脂粉末与在喷镀喷嘴的喷射流路46内流动的加热气体合流而喷镀到对象物的局部区域(图3(c))。由此,根据本实施方式,通过反复进行上述操作例如在对象物停止的状态下将少量的粉体树脂间歇性地多次喷镀到同一部位,即便在极窄的范围内也能够可靠地形成规定量的树脂隆起。根据本发明的方法,由于间歇性地喷射少量的树脂,所以在喷镀树脂部分熔融的状态下,能够在对象物表面熔融而热粘结,不会发生热粘结不良。另外,通过对形成的树脂隆起再次进行加热,还能够使表面变得更加光滑。
应予说明,在树脂粉末的粒径较小且树脂粉末的滑落性较差的情况下,如图4(b)所示,将设置在罐体内的粉体树脂供给装置34的喷嘴34-1延伸至靠近计量室的上部而压缩填充粉体,以便在计量室37内完全填充树脂。
实施例
实施例1:(在层压原纸上形成树脂隆起)
如图5所示,使用上述装置以如下条件在试制层压原纸70([表]聚乙烯18μm/原纸(300g/m2)/[里]聚乙烯18μm)的表侧喷镀粉末树脂。
粉体树脂:平均粒径120μm的低密度聚乙烯粉体
1次的粉体喷射量:约20mg
喷镀喷嘴与喷镀对象面之间的距离:6mm
喷嘴出口热风温度:320℃
预热:喷射前延迟1.5s
结果:能够没有产生拉丝现象且良好地形成如图5那样的中央部被覆膜厚1.1mm的树脂隆起71。
实施例2:(在台阶部处形成树脂隆起)
利用上述装置以如下条件在杯状容器1的开口卷边部3的台阶部4附近喷镀树脂。
粉体树脂:平均粒径120μm的低密度聚乙烯粉体
1次的粉体喷射量:约25mg
喷镀喷嘴与喷镀对象面之间的距离:10mm
喷嘴出口热风温度:320℃
预热:喷射前延迟1.5s
备注:利用热风发生器实施再次加热
结果:如图6(b-1)所示,能够以覆盖台阶部4的方式良好地形成被覆膜厚0.3mm的树脂隆起8。
由此,通过在台阶部形成树脂隆起,在热封盖材时,该树脂熔融,即便没有压扁卷边部,与盖材的熔敷性也会进一步提高,能够使密封性得到提高,并且,能够消除直饮时的不舒服感觉。另外,在有顶盖的情况下,由于卷边部的台阶部消失,所以还能够防止从此处泄露。
实施例3:(以对象物的局部改性为目的的树脂被覆)
在以下的条件下对杯状容器的环状支脚部内周面的整周进行树脂被覆。
测试容器:杯状容器(材质:主体部及底部均相同)
材质层构成:
主体部:(内)聚乙烯(20μm)//纸(250g/m2)
底部:(内)聚乙烯(40μm)//纸250g/m2//聚乙烯(15μm)
满杯内容量:565ml、环状支脚部高度:10mm
喷镀条件:
粉体树脂:平均粒径120μm的粉体聚乙烯
防止烧焦物质(低介电常数材料):碳酸钙
树脂涂膜:沿着环状支脚部内周整周,宽度为约10mm,被膜厚度为1mm以下
如上所述,在环状支脚部内周面形成了含有防止烧焦物质的树脂被覆层。为了确认杯状容器的烧焦的发生状况,进行如下的试验。
容器填充内容物:水330ml
微波炉功率:500W
加热时间:6min
上述加热条件对于食用内容物(乌冬面食品)而言为最佳的通常的加热温度。
烧焦的发生状况:形成有被覆层的本实施例的容器,在环状支脚部上所产生的烧焦的颜色与作为比较例的未设置被覆层的容器相比较淡且范围窄。
以上,对本发明的应对微波炉的纸成型容器的实施方式及实施例进行了说明,但是,本发明并不限定于这些实施方式及实施例,作为纸成型容器,不必限定于具有环状支脚部的杯形状的容器,能够应用于具有应对微波炉的纸成型容器的容易发生烧焦的部位的各种结构的容器。
产业上的可利用性
本发明能够在纸成型容器的狭窄的局部区域可靠且高效率地形成树脂隆起,能够以简单的构成解决纸成型容器的密封性、应对微波炉的烧焦发生的问题点,能够以廉价的构成提高纸成型容器应用到常温流通的应用可能性,另外,能够在局部区域可靠地喷镀被覆树脂,产业上的可利用性高。
Claims (6)
1.一种被覆方法,利用以合成树脂为主体的被覆材料来被覆对象物的局部区域,其特征在于,
所述被覆材料为以合成树脂为主体的粉体,将该粉体间歇性地喷镀到所述局部区域。
2.根据权利要求1所述的被覆方法,其特征在于,
在所述喷镀中,定量切出所述粉体,利用加压气体进行压送并使其与加热气体合流,间歇性地喷镀到所述局部区域。
3.根据权利要求2所述的被覆方法,其特征在于,
所述加热气体为热风,在熔点附近对所述合成树脂粉体进行加热而使其部分熔融。
4.根据权利要求1所述的被覆方法,其特征在于,
对所述对象物的要被覆的局部区域进行预热。
5.一种被覆装置,利用以合成树脂为主体的被覆材料来被覆对象物的局部区域,其特征在于,
所述被覆材料为粉体,该被覆装置包括:供给该粉体的罐体、与该罐体的下端连通的喷镀喷嘴、设置在所述罐体的下端开口部与所述喷镀喷嘴之间的定量切出遮挡装置,用所述定量切出遮挡装置从所述罐体中切出定量的粉体,使其与加热气体合流,并由所述喷镀喷嘴进行喷镀。
6.根据权利要求5所述的被覆装置,其特征在于,
所述定量切出遮挡装置由横穿所述罐体的出口开口部的旋转体构成,在该旋转体上设置有面对所述罐体的出口开口部的计量室,并且,具有与该计量室的气体供给口连通并向该计量室供给加压气体的阀门,所述旋转体能够在计量位置与喷镀位置之间进行间歇旋转,在计量位置,面对所述罐体的出口开口部而计量定量的粉体,在喷射位置,所述计量室面对所述喷镀喷嘴,从所述阀门向所述计量室供给加压气体而将所述粉体压送到所述喷镀喷嘴。
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US (1) | US20170191151A1 (zh) |
EP (1) | EP3150502A4 (zh) |
KR (2) | KR101877275B1 (zh) |
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WO (1) | WO2015182760A1 (zh) |
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EP3261942B1 (en) * | 2015-02-27 | 2019-12-18 | Graphic Packaging International, LLC | Container with coating |
JP6867151B2 (ja) * | 2016-12-15 | 2021-04-28 | 東洋製罐グループホールディングス株式会社 | 紙容器、胴材ブランク、および紙容器の製造方法 |
US20200040214A1 (en) | 2018-08-01 | 2020-02-06 | The Boeing Company | Thermoplastic Coating Formulations For High-Velocity Sprayer Application and Methods For Applying Same |
US11136480B2 (en) * | 2018-08-01 | 2021-10-05 | The Boeing Company | Thermal spray plastic coating for edge sealing and fillet sealing |
US11767436B2 (en) | 2018-08-01 | 2023-09-26 | The Boeing Company | Thermal and cold spray plastic coating covering vehicle fasteners inside fuel tank for lightning strike and other electromagnetic protection |
CN113165274B (zh) * | 2018-12-19 | 2023-07-25 | 雀巢产品有限公司 | 用于使用具有带有肋的特定轮廓的密封头生产气密的一次性食物容器的制造方法 |
US11591103B2 (en) | 2019-03-28 | 2023-02-28 | The Boeing Company | Multi-layer thermoplastic spray coating system for high performance sealing on airplanes |
WO2021002113A1 (ja) * | 2019-07-02 | 2021-01-07 | 東罐興業株式会社 | 紙容器 |
CN115870189A (zh) * | 2022-12-30 | 2023-03-31 | 东莞市新唛标签制品有限公司 | 菜盒封盖的局部涂覆热熔胶的方法 |
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- 2015-05-29 CN CN201580027343.XA patent/CN106414252B/zh not_active Expired - Fee Related
- 2015-05-29 KR KR1020167033841A patent/KR101877275B1/ko active IP Right Grant
- 2015-05-29 US US15/314,578 patent/US20170191151A1/en not_active Abandoned
- 2015-05-29 KR KR1020187004758A patent/KR101894755B1/ko active IP Right Grant
- 2015-05-29 WO PCT/JP2015/065631 patent/WO2015182760A1/ja active Application Filing
- 2015-05-29 CN CN201810184719.3A patent/CN108284995A/zh active Pending
- 2015-05-29 EP EP15800664.3A patent/EP3150502A4/en not_active Withdrawn
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Also Published As
Publication number | Publication date |
---|---|
US20170191151A1 (en) | 2017-07-06 |
CN106414252A (zh) | 2017-02-15 |
WO2015182760A1 (ja) | 2015-12-03 |
EP3150502A4 (en) | 2018-05-30 |
KR20160148019A (ko) | 2016-12-23 |
KR101877275B1 (ko) | 2018-07-11 |
EP3150502A1 (en) | 2017-04-05 |
CN106414252B (zh) | 2019-01-25 |
KR20180021227A (ko) | 2018-02-28 |
KR101894755B1 (ko) | 2018-09-04 |
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