共查询到20条相似文献,搜索用时 187 毫秒
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颜料涂布是一种提高印刷纸诸如纸页光泽度、印刷光泽度、拉毛强度和平滑度等纸页性质及印刷性质的技术。要想提高纸页光泽度,通常使用压光(超压或热软压区压光)方法。涂布纸由于压光压力的影响会降低其松厚度。铸涂为一种生产高光泽度和高松厚度纸张可采用的方法。在此方法中,由颜料和粘合剂组成的湿涂层接触在镜面般整饰铸缸的表面。铸涂的缺点之一是其生产速度慢,因此意味着生产成本高。已经提出了几种采用热压光机而不是铸涂缸生产高光泽度纸张的设想。这些技术基于颜料/聚合胶乳混合物或水溶性聚合物的涂布,其后用热压光机迸行压… 相似文献
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正目前,如厨房用纸、擦手纸、耐磨纸、过滤纸等,为了保证它的高膨化性、高透气性,一般使用压榨方式进行脱水。高膨化性、高透气性的特种纸张特别适合于使用在木类纤维的纸张(例如烟草薄片)的生产线上。干燥如木类纤维的纸张,一方面因为后面浸涂工艺的要求,压榨加压不能太高;另一方面由于这类纤维的性质,在纤维不压溃的情况下,无论怎么加压也不可能使特种纸张干度达到24%以上。在上述两种情况下,特种纸张一般采用扬克气罩进行干燥,一方面特种纸张干燥速率较低,无法获得具有很好的高膨化、高透气、高浸涂性的纸张(特种纸张这种性能往往和其干燥速率相关,干燥速率越高,特种纸张的膨化性、透气性和浸涂性越好);另一方面由于特种纸张进缸干度低,极易产生黏缸现象,烘缸压力不 相似文献
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纸张的起皱起皱剂与脱缸剂黄菊洪江苏镇江金河纸业有限公司技术处212006本文从纸张起皱的基本原理出发,讨论起皱剂与脱缸剂在沙造皱纹类纸张(如生活用纸)过程中的作用与应用问题。一、纸张起皱基本原理众所周知,纸张起皱的结果可以大大改进纸的变形性,提高纸的... 相似文献
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本文从纸张起皱的基本原理出发,讨论起皱剂与脱缸剂在抄造皱纹类纸张(如生活用纸)过程中的作用与应用问题。1纸张起纳基本原理纸张起皱可以大大改善纸的变形性质,提高纸的伸长率和动态强度,获得柔软性、松软性和弹性,改进纸的吸收特性、透气特性以及其它特殊性质。纸张起皱的方法除近年出现的“印纹压辊”方法外.最普及而被广泛应用的仍是使用刮刀在供缸上起皱,并将纸页从缸面上剥离的刮刀法。根据与刮刀接触纸幅的水分又可划分三种。(1)湿法起皱:纸幅水分在40~朋%状态下起皱;(2)半干法起皱:纸幅水分在20~40%状态下起组… 相似文献
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改造双圆网双烘缸造纸机结构的新设想 总被引:1,自引:0,他引:1
<正>ZV_4型1575mm双圆网双烘缸造纸机 (以下简称双网双缸造纸机)生产的凸版纸、书写纸等双面使用的纸张,两面平滑度差大一直是生产单位极为重视的问题。在生产中,为了提高纸的反面平滑度,使纸的两面差达到小于30%的标准要求,做了大量的工作。在操作上,主要是控制好纸幅出一缸水份,使进入二缸纸幅的水份保持在25%~30%之间,其次是适当加大二缸上压光辊的线压力,并张紧干网,把纸幅反面紧贴在二缸缸面上,也可提高纸的反面平滑度。在设备改进方面,有的纸机在二缸上安装施水辊,使二缸表面形成一层均匀的水膜,以增加纸幅反面与缸面的贴紧程度;有的则在二缸上安装半湿压光机;也有的厂取消压榨辊和毛毯,在一缸托辊下面增加一根压榨辊,与烘缸组成三辊二压区复合压榨,这些措施都有利于提高纸的反面平滑度,缩小纸张的两面差,这也是各厂多年积累和创造的行之有效的成功经验。 相似文献
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ZV_4型1575毫米双圆网双烘缸造纸机(以下简称双网双缸造纸机)生产的凸版纸、书写纸等双面使用的纸张,两面平滑度差大一直是生产单位极为重视的问题。在生产中,为了提高纸的反面平滑度,使纸的两面平滑度差达到小于30%的标准要求,做了大量的工作。在操作上,主要是控制好纸幅出一缸水份,使进入二缸纸幅的水份保持在25~30%之间,其次是适当加大二缸上压光辊的线压力,并张紧干网,把纸幅反面紧贴在二缸缸面 相似文献
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ABSTRACT: Poly(lactide)-coated paperboards were prepared by a solution coating method, and the effect of coating to improve properties of paperboard used for the manufacturing of 1-way paper cups was tested. Surface of PLA-coated paperboards was smooth and shiny like PE-coated paperboard, and the coating weight and thickness increased linearly with increasing PLA concentration of coating solution. Tensile strength (TS) and elongation at break (E) of the paperboard also increased after PLA coating. Water vapor barrier or water-resistant properties tested, such as water vapor permeability (WVP), water absorptiveness (WA), and contact angle (CA) of water drop, indicated that water resistance of the paperboard was improved through surface coating with PLA. The increase in water resistance of PLA-coated paperboards was mainly due to the hydrophobicity of PLA and the improvement of water barrier properties increased depending on the PLA concentration. In addition, PLA-coated paperboard showed strong heat sealing property when coated with more than 1 w/v% of PLA. Wet strength of PLA-coated (3, w/v%) paperboard was comparable to or greater than that of PE-coated paperboard. All the test results indicated that the PLA-coated paperboard can be exploited for the manufacturing of 1-way paper cups as an alternative to the PE-coated paperboard. 相似文献
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通过对皮革行业现状的分析,首次将真空机制引入皮革转鼓的设计,并根据皮革湿加工的工作原理以及真空条件下的湿加工过程的反应特点,对此设备的结构进行了优化设计。结果表明,这种新型的转鼓具有生产效率高,能源消耗少,使用范围广等优点。 相似文献
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纸板涂布机的发展现状 总被引:1,自引:0,他引:1
纸板涂布机在近20年中发展很快,传统的计量棒涂布加气刀涂布已不能满足日益提高的涂布纸板的印刷质量要求。Combi-Blade组合刮刀涂布和Vari-Bar可调刮棒涂布的开发成功,纸板涂布工艺也从二次涂布增加到三次涂布,大大改善了涂布纸板的质量。 相似文献
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Ozaki A Kawasaki C Kawamura Y Tanamoto K 《Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan》2006,47(3):99-104
Migration of bisphenol A (BPA) and benzophenones, i.e., benzophenone (BZ), 4-(dimethylamino)benzophenone (DMAB), Michler's ketone (MK) and 4,4'-bis(diethylamino)benzophenone (DEAB), from 21 paper and paperboard products (15 recycled paperboard boxes and 6 virgin paper products) used in contact with food was examined. Migration levels of compounds from recycled paperboard were compared under various food-simulating conditions. BPA showed the highest migration into 20% ethanol and benzophenones into 95% ethanol. No compounds migrated from virgin paper products, but compounds did migrate into food simulants from recycled paperboard food boxes. BPA migrated into 20% ethanol from all recycled paperboard food boxes between 1.0 and 18.7 ng/mL. Into 95% ethanol, migration of BZ was observed in 8 samples (1.0-18.9 ng/mL), DMAB in 12 samples (1.2-3.7 ng/mL), MK in 13 samples (1.9-9.0 ng/mL), and DEAB in 13 samples (1.0-10.6 ng/mL). The highest migration level was 27.2 ng/mL and most of the migration levels were below 10 ng/mL. These values are sufficiently low compared with the TDI and NOAEL levels. Moreover, the amount of food in daily meals that comes into contact with paperboard products is relatively small. Consequently, it was concluded that there was no safety concern regarding the tested compounds in recycled paperboard food boxes. 相似文献
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The influence of different coating formulas and times on the water and oil resistance of paperboard was studied.The water and oil resistance of paperboard coated with a modified butadiene-styrene copolymer latex and fluorinated anion grease-proof agent was better than that coated with modified butadiene-styrene copolymer latex,where the modified butadiene-styrene copolymer latex was used as the pre-coating substrate and the F1516 fluorinated grease-proof agent was used as the top coating material.By coating modified butadiene-styrene copolymer latex with 30% solid content and F1516 fluorinated grease-proof agent with 24% solid content,the oil resistance of paperboard could reach anti-oil grade 12 and the water resistance could increased by 98.64% (compared with the base paperboard without any coating treatment). 相似文献
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针对滤棒成型机组和卷接机组上使用的两种布带轮结构存在的问题,在研制ZL27型滤棒成型机组的过程中,根据布带轮的工作原理和布带的结构特性,设计了新型布带轮.该布带轮为一体式圆盘结构,用轮体表面加工花纹代替防滑胶带,表面花纹与布带编织纹理相匹配,可有效防止布带打滑.布带轮采用模具钢替换原来的铸铁材料,减少了花纹磨损,提高了布带轮的使用寿命.应用效果表明,一体式布带轮与布带的运行平稳可靠,无打滑现象,布带轮未出现磨损.滤棒长度标准偏差0.03 mm,高于标准要求,长度合格率达100%.一体式布带轮结构简单,对称平衡,有效降低了设备振动和噪声,提高了机组的运行效率,降低了维护成本. 相似文献