影响纸板粘合强度和纸箱抗压力的因素

纸箱在运输和贮存方面的质量,主要取决纸箱的物理性能,纸箱的物理性能主要有纸板粘合强度,耐破强度,戳穿强度以及纸箱抗压力。这里主要谈影响纸板粘合强度和纸箱抗压力诸多因素。 瓦楞纸板的粘合强度是指单位面积上瓦楞板内板纸与瓦楞承受的张力,标准单位为N/cm~2(牛顿/平方厘米),理论计算公式为A=     

不同干燥方式对纸浆模塑材料性能的影响

目的研究不同打浆度、温度和压力下,热压干燥与真空干燥方式对纸浆模塑材料强度性能的影响。方法分别利用热压干燥方式与真空干燥方式对纸浆模塑材料进行干燥成形,检测不同打浆度、温度和压力下模塑材料的抗张指数、耐破指数、戳穿强度和挺度,最后用扫描电镜对2种干燥方式下的纤维结构进行观察。结果热压干燥制得的模塑材料的抗张指数、耐破指数、戳穿强度和挺度均比真空干燥的性能高;材料的抗张指数、耐破指数和戳穿强度均随打浆度的提高呈现先升高后降低的趋势;耐破指数、戳穿强度和挺度随热压温度的升高而增强;热压压力增大,材料的戳穿强度增强,而挺度减小。通过扫描电镜观察,采用热压干燥方式的纤维间的结合比真空干燥方式的更紧密。结论热压干燥方式下,打浆度为65°SR,温度为110℃时,材料的抗张指数、耐破指数和戳穿强度值最高,分别为26.235 N·m/g,1.234 kPa·m2/g,3.42 J。在今后的生产实践中,可根据制备不同需求的纸浆模塑材料,选取合适的干燥方式。     

被服包装纸箱的防潮防霉技术

目的研发被服等纺织品包装用高强防霉瓦楞纸箱。方法采用复合技术,制备六层复合瓦楞纸箱。里、面纸通过涂布方式,将防潮和防霉功能结合于同一纸箱上,并测试纸箱的强度、防水和防霉性能。结果复合纸板的边压强度和戳穿强度分别为21 060 N/m,39.4 J,分别是德国A标最高要求的1.62倍和2.19倍。箱纸板表面吸水率从34.7 g/m~2降至2.56 g/m~2。在温度为28℃、相对湿度为90%的环境中处理7 d后,涂布防霉剂纸板表面无霉菌生长。经28 d防霉实验,防霉纸箱内外表面以及内装物未发现霉菌生长,防霉等级达到最高Ⅰ级。结论防潮防霉纸箱强度大,能够起到较好的防潮防霉效果,有效保护被服等内装物不受霉菌的侵害。     

一种复合淀粉制备及在纸张表面施胶上的应用研究

对用原淀粉复合脂肪酸、原淀粉包埋沉淀碳酸钙(PCC)作为纸张表面施胶剂进行了研究.结果表明:原淀粉添加少量脂肪酸可以得到比单独使用原淀粉或阳离子淀粉时优异的抗水性和较好的强度与挺度;与专用施胶的阳离子淀粉相比,添加少量PCC的原淀粉可改善挺度.对在纸板制箱过程需要憎水的纸品,脂肪酸复合淀粉是一种很有运用前景的表面施胶材料.     

纸和纸板的弯曲挺度测试简介

<正>弯曲挺度又称弯曲强度,是纸或纸板在弹性变形范围内受力弯曲时所产生的单位阻力矩。因挺度的大小与纸箱承受外界压力不致弯曲或被破坏有关,所以挺度一直是衡量纸和纸板耐弯曲的强度性能指标。简单来说,弯曲挺度使纸或纸板具有了抗弯、抗压、抗扭矩的能力。作为一个重要的物理性能指标,挺度的大小与纸制品的加工成型以及应用     

石头纸蜂窝纸板力学性能试验研究

将定量为202 g/m2,厚度为0.16 mm石头纸,制作成为蜂窝纸板,根据国家标准检测其平压强度、边压强度、戳穿强度和耐破度。通过试验检测得到:石头纸蜂窝纸板的平压强度均值为628 kPa,边压强度的均值为12.1 N/cm,戳穿强度的均值为8.84 J,耐破度高。结果表明:石头纸蜂窝纸板的平压强度优于传统纤维纸板,边压强度低于纤维纸板国家标准值,耐戳穿强度符合国家标准,耐破坏性能突出。     

瓦楞纸板预氧化淀粉粘合剂的开发研究

介绍了预氧化淀粉及其粘合剂制备的原料、配方和方法。讨论了在制备过程中不同因素（温度、氧化剂及用量等）对预氧化淀粉及其对粘合剂粘合性能，丽楞纸板的剥离强度、边压强度、耐破强度的影响，阐述了预氧化淀粉氧化剂残留率的检测方法。     

三氯化铁替代硼砂对氧化淀粉胶粘剂性能的影响

目的为了改善氧化淀粉的综合性能。方法以交联剂三氯化铁替代硼砂,采用高锰酸钾氧化法制备了无硼砂淀粉,并研究了交联剂三氯化铁用量、无机填料、高聚物等对氧化淀粉胶粘剂性能(黏度、初粘强度、防水性、粘合强度等)的影响。结果替代后的氧化淀粉胶粘剂不仅具有更好的黏度与初粘强度,而且其与无机填料以及高聚物均具有更好的兼容性。结论三氯化铁替代硼砂后所制备的氧化淀粉胶的防水性、粘结强度更好。     

中温淀粉酶改性玉米淀粉在纸板中的应用研究

目的 以酶改性玉米淀粉为施胶剂,对箱纸板和瓦楞纸板进行表面施胶,研究其对纸板物理性能的影响.方法 使用中温淀粉酶改性玉米淀粉,测试其粘度变化;然后将酶改性淀粉施胶于箱纸板和瓦楞纸板表面,测试箱纸板的挺度、环压强度、耐破度、耐折度、抗张强度以及瓦楞纸板的边压强度和耐破度,探索酶改性玉米淀粉对箱纸板和瓦楞纸板表面施胶的最佳用量.结果 使用2.5μL淀粉酶改性质量分数为10％的玉米淀粉后,将其施胶于箱纸板表面,此时箱纸板的物理性能最优.与空白样相比,箱纸板的横向挺度提高了380％,纵向挺度提高了464％,环压强度提高了53.2％,纵向抗张强度提高了10.6％,横向抗张强度提高了9.6％,箱纸板的耐破度变化不大,耐折度降低;经2μL淀粉酶改性质量分数为10％的玉米淀粉后,将其施胶于瓦楞纸板表面,其边压强度提升最多;与空白样相比,边压强度提高了45.5％.结论 酶改性玉米淀粉的制作工艺简单,为制备高性能纸板提供了参考依据.     

胶印工艺的新亮点--微型瓦楞纸板的印刷

瓦楞纸板是先将瓦楞原纸加工成瓦楞状，然后用胶粘剂从两段将表面和中间瓦楞状层粘合起来，使纸板中层呈空心结构，它具有较高的强度、挺度、耐压耐破强度等。由于它的特殊性能，现在广泛应用于产品的包装。     

纳米SiO2疏水涂层对纸和纸板性能的影响

目的对牛皮纸及瓦楞纸板进行纳米SiO_2疏水涂层处理后,探讨其对纸或纸板性能的影响。方法将纳米SiO_2和有机硅树脂混合制成疏水涂层,浸渍、喷涂于牛皮纸及瓦楞纸板表面,通过测试纸张接触角及可勃吸水值检验疏水效果,并测试纸张的抗张强度、耐折度、撕裂度、耐破度及检验瓦楞纸板的边压强度、平压强度、戳穿强度等物理性能。结果经表面混合树脂处理的疏水纸张的接触角为88.6°,可勃吸水值大大降低。随着涂层层数的增加,牛皮纸耐破度及瓦楞纸板平压强度均整体随之增长。经双涂层涂饰处理后瓦楞纸板的各物理性能均有较大提高,纳米SiO_2双涂层瓦楞纸板较单涂层瓦楞纸板力学性能更优良。结论纸张及纸板经纳米SiO_2疏水涂层处理后,不仅在一定程度上提高了纸张与纸板的疏水性能,对纸张与纸板的物理性能也有一定程度的改良,为实现纸或纸板的防水包装提供了一定的理论基础与处理方法。     

4种生物胶与麦秸秆制备复合材料性能比较

为比较生物胶（海藻酸钠、瓜尔胶、淀粉胶、植物蛋白胶）与麦秸秆制备麦秸秆/生物胶复合材料的力学性能和吸湿性能,分析了4种生物胶和麦秸秆的红外光谱,测试了麦秸秆/生物胶复合材料的力学性能和吸湿性能,观察了它们的微观结构。结果表明:4种生物胶均有-OH和-CH伸缩振动吸收峰,植物蛋白胶有-NH₂伸缩振动吸收峰和-O-吸收峰。植物蛋白胶制备的复合材料力学性能较好,吸湿率较小,其拉伸强度比海藻酸钠、瓜尔胶、淀粉胶制备的复合材料分别高436%、93%、416%,弯曲强度分别高922%、49%、963%,弹性模量分别高714%、678%、254%,平衡吸湿率分别小42%、17%、16%。麦秸秆/植物蛋白胶和麦秸秆/瓜尔胶复合材料中麦秸秆被基体包裹较好,植物蛋白胶-麦秸秆和瓜尔胶-麦秸秆两相界面模糊,两者结合较好;而麦秸秆/海藻酸钠和麦秸秆/淀粉胶复合材料两相界面空穴和缺陷较多,麦秸秆与基体之间存在明显界面,与麦秸秆结合较差。麦秸秆/植物蛋白胶复合材料在力学性能方面与塑料基复合材料相当,而吸湿性能有待提高。      

Preparation and Properties of Slag Wool Board using Modified Polyvinyl Alcohol as Binder

Slag wool boards were produced by using slag wool as the main raw material and adding modified polyvinyl alcohol (PVA) as the binder. The microstructure, thermal conductivity, compression strength, hydrophobicity, and other properties of the slag wool board were analyzed by using scanning electron microscopy, thermal conductivity tester, electronic universal testing machine, and other equipments. Also, the influence of different types and amount of binder on the properties of the slag wool board was studied. The results show that the addition of silica sol can improve the high temperature resistance of the slag wool board, and the addition of borax can improve the hydrophobic rate and compression strength of the slag wool board. Also, the concentration of PVA has obvious influence on the usage of silica sol and borax. In this study, we found that the optimal ratio of the binder should be 3 wt% addition of PVA, 20 wt% addition of silica sol, and 0.2 wt% of borax (relative to the amount of PVA), under the condition of satisfying the performance index of slag wool board and the convenience to spray the adhesive.     

防锈瓦楞纸板制备工艺和性能的研究

研究了以二环已胺分别和载体淀粉胶和氧化淀粉胶粘剂组成的缓蚀性胶粘剂的缓蚀性能,分别研究了以2种不同的缓蚀淀粉胶粘剂为粘合剂制成的防锈瓦楞纸板的缓蚀性能和机械性能.研究结果表明:缓蚀胶粘剂和以其制成的瓦楞纸板对金属铁都有缓蚀作用,同时气相缓蚀剂的加入对防锈瓦楞纸板的边压强度和粘合强度影响较小.     

Investigations the effects of fastener, glue, and composite material types on the strength of corner joints in case-type furniture construction

This study was carried out to determine the performance of different construction techniques on the diagonal compression and tension strength of case-type furniture corner joints, and to determine the effects on these joints of some factors including the type of joint, the type of composite board and the glue type. For this purpose, melamine-coated particleboard (MCP) and melamine-coated fiberboard (MCF) panels were bonded with polyvinyl acetate D3 (PVA D3), polyvinyl acetate D4 (PVA D4) and Desmodur VTKA (DVTKA) adhesives on spline joint (Sj), butt joints (Buj), biscuit joints (Bij), plain dowel joints (PDj), grooved dowel joints (GDj). It became evident that the diagonal tension and compression strength of the joints is influenced by panel material, type of adhesive and joints. The diagonal tension strength was greater than the diagonal compression strength of all L-type corner joints. The highest diagonal tension strength was obtained in MCF with DVTKA adhesive and GDj while highest diagonal compression strength was obtained in MCP with PVA D4 and Sj. In both tests, MCF corner joints were stronger than MCP corner joints. Furthermore, diagonal tension and compression strength of the joints glued with PVA D4 adhesive was higher than the similar joints glued with PVA D3 and DVTKA adhesives.     

瓦楞纸箱的“爆线”及局部PVA涂覆处理技术

对瓦楞纸板压线进行PVA局部涂覆前后,在相对湿度为25%,35%,50%环境下测定了其耐折性能和耐破度,分析了PVA局部涂覆对"爆线"现象的影响。结果表明:在相对湿度为25%的条件下,PVA局部涂覆对"爆线"现象改善不明显,在相对湿度为35%和50%时,PVA局部涂覆可有效改善瓦楞纸板"爆线"现象。     

SiO2气凝胶改性瓦楞纸板性能研究

目的应用SiO₂气凝胶疏水隔热水性涂料对瓦楞纸板表面进行改性,探究其对瓦楞纸板力学性能、疏水性能、隔热性能的影响。方法通过机械共混和表面改性相结合的方式制备疏水隔热水性涂料,采用线棒涂布器涂布于瓦楞纸板表面,通过测试纸板表面的接触角检验疏水效果,并测试改性后纸板的边压强度、平压强度、戳穿强度和压痕强度;制备90 mm×90 mm×100 mm的隔热包装箱,通过融冰试验测试其隔热效果。结果经SiO₂气凝胶疏水隔热水性涂料改性后的纸板接触角为91.75°,提高了6.25°。改性后纸板的横向边压强度、平压强度、戳穿强度和纵向压痕强度分别提高了5.6%,0.6%,2.4%和2.7%。当SiO₂气凝胶的质量分数为2%时,改性后的纸板具有最优的隔热性能。当湿膜厚度为60μm时,与未涂布的原瓦楞纸板相比,温度可降低13.6℃结论该方法扩大了SiO₂气凝胶在包装行业的应用范围,能为未来保温包装材料提供参考。     

瓦楞纸板用抗水淀粉胶配方及性能研究

简要分析了玉米淀粉胶的组成及对其质量的影响，重点对粘合剂的防水性进行了研究，叙述了瓦楞纸板用抗水粘合剂的配制及工艺过程，并与常规方法制备的粘合剂进行了性能比较，测定了抗水时间，得出了瓦楞纸板用抗水粘合剂的最佳配制比例。     

Control of hydration rate of polymer modified cements by the addition of organically modified montmorillonites

The addition of polyvinyl alcohol (PVA) in concrete causes a delay in the hydration rate of Portland cement paste. Three different montmorillonites (MMTs) (Cloisite Na, 30B, and Nanofil) were previously mixed with PVA in order to control this delay. A comparison between the hydration rate of Portland cement paste and Portland cement paste modified with PVA and the different MMTs was made by means of semi-adiabatic calorimetry, thermal gravimetric analysis and contact angle measurements. Different rates of hydration were obtained with each MMT. The paste with PVA and Nanofil behaves almost the same as the unmodified cement paste. Mechanical properties were also studied. An increase in the flexural strength and a decrease in the compression strength were found, which is expected for a Portland cement paste modified with PVA. The addition of MMT to the cement paste with PVA hardly affects the mechanical properties.     

Characterisation of a new bioadhesive system based on polysaccharides with the potential to be used as bone glue

Although gluing bone is in theory a very attractive alternative to classical fracture treatment, this method is not yet clinically established due to the lack of an adhesive which would meet all the necessary requirements. We therefore developed a novel two-component bioadhesive system with the potential to be used as a bone adhesive based on biocompatible and degradable biopolymers (chitosan, oxidised dextran or starch). After mixing in water, the two components covalently cross-link by forming a Schiff’s base. By the same mechanism, the glue binds to any other exposed amino group such as for example those exposed in fractured bone, even in the presence of water. Modified chitosan was synthesised from commercially available chitosan by deacetylation and was then reduced in molecular weight by heating in acid. The amount of free amino groups was analysed by IR. The molecular weight was determined by viscosimetry. Starch or dextran were oxidised with periodic acid to generate aldehyde groups, which were quantified by titration. l-Dopa was conjugated to oxidised dextran or starch in analogy to the gluing mechanism of mussels. Biomechanical studies revealed that the new glue is superior to fibrin glue, but has less adhesive strength than cyanoacrylates. In vitro cell testing demonstrated excellent biocompatibility, rendering this glue a potential candidate for clinical use.