机织物折皱变形量值理论计算分析

基于圆形截面纱线的平纹织物模型,依据几何学,推导出平纹织物折皱弯曲变形计算方程,提出表征织物松紧结构的新指标——织物密度放松值γ．通过数值计算表明,织物折皱变形与织物密度放松值γ呈线性递减的关系,且挤紧结构状态的平纹织物的纱线最外层最大变形率达到40．75％．     

Wrinkling analysis of creased rectangular membrane

In this paper,the wrinkle-crease interaction behavior of a rectangular membrane under edge tension is simulated.The creased membrane is modeled by using a Modified Two-Parameter model.In this model,two crease parameters,i.e.the effective modulus of creased membrane and the residual stress from creasing,are computed by using MacNeal’s method that was firstly applied directly in a flat membrane with the local crease.We have proposed a method to solve the wrinkling computing issue of the creased membrane by using a Direct Perturb-Force technique in our previous work.Based on our method,the effects of crease location on the wrinkle-crease interaction behavior can be evaluated accurately.These results will be of great benefit to the analysis and the control of the wrinkles in the membrane structures.     

数控激光模切机的研制与应用

当前国内所采用的传统机械模切,其中模切板的制作过程复杂且成型后修改困难,针对这种情况研制了一种新型的数控激光模切机。根据计算机内包装纸盒展开图样,由激光束直接加工材料表面达到模切和压痕效果,以激光的非接触式加工代替了传统的机械加工,不再需要木质镶刀模切板,从而降低了生产成本。通过样机实验,初步验证了其可行性。     

Creasability testing by inclined rules — a base for standardized specification of paperboard

In die cutting manufacture of paperboard it is necessary to apply the correct creasing conditions, e.g. neither too small nor too big a rule height, in order to achieve sufficiently low folding resistance without any cracks along the folding lines. The most appropriate rule height for a given paperboard is usually determined by trying different rule heights in a series of very time consuming and costly trial and error tests. And, in practice, this procedure must be repeated for each major change in board quality. This report shows that an inclined crease rule, i.e. a rule having a gradually increasing rule height, can be used advantageously to rationalize such tests and to achieve much greater reliability. A folding line produced by such an inclined rule contains both the upper limit for the rule height, i.e. where cracks start to appear, and the lower limit, i.e. where the rule height is obviously too small, and the technical range for achieving a good creasing result is thus clarified in one single test. Illustrative data for two types of paperboard are given as well as some theoretical aspects of the concept of creasability. Considering that the described method not only rationalizes the testing work but also enables more reliable observations to be made than have been possible in the past, the method opens new potentials for effective research and development in the fields of converting, convertibility, die form design, etc. © 1997 John Wiley & Sons, Ltd.     

竹浆纤维含量对竹／棉混纺交织物弯曲性能影响

为更好地了解竹／棉交织面料的性能特点。设计织造了15种不同规格的竹／棉混纺交织面料并对其悬垂性、刚柔性、折皱性进行了测试比较．结果表明,竹／棉混纺交织物与纯棉织物比较,其悬垂性、刚柔性和抗皱性得到显著改善．随着纬纱中竹浆纤维含量的增加,凸条数明显增多,悬垂感和形态效果得到有效改善．竹／棉混纺交织既可改善织物的刚柔性,又能提高织物的抗皱性．但考虑到服用织物的形态对称性,应避免选用55竹／45棉混纺纱与棉纱交织．当织物组织、原料及经密相同时,随着织物中纬密的增大,混纺交织物的悬垂性和刚柔性变差。织物的急、缓弹性回复性能呈下降趋势．     

亚麻无醛防皱整理剂的合成与应用性能研究

以MA和CA为反应物，研究亚麻无醛防皱整理剂的合成及其应用。通过对产物进行红外光谱图的分析，证实了聚合型多元羧酸(PMA／CA)无醛防皱整理剂的生成，把其应用于亚麻织物的防皱整理，并对影响防皱整理效果的因素进行了分析。结果表明：所合成的聚合型多元羧酸(PMA/CA)，对亚麻具有良好的防皱性，对织物的白度和强力基本无影响。     

An industry‐oriented strategy for the finite element simulation of paperboard creasing and folding

The numerical simulation of paperboard creasing and folding processes is of increasing importance for the design and production of safe and reliable packaging systems. The extreme material anisotropy and the complexity of these processes require however simulation capabilities which are seldom available in commercial codes. Several approaches have been proposed in the literature over the years, in most cases making use of non‐linear material models developed ad hoc for this purpose. These models, some of which are very effective and accurate, are not in general available in commercial codes and are often based on the definition of a large number of parameters. In this paper, the possibility to obtain acceptable, first‐hand simulation results using only features already available in a commercial code is investigated. An advanced continuum constitutive model, recently presented in the literature, has been used as a reference for tuning the model and for assessing its accuracy. It is shown how standard features, usually available in state‐of‐the‐art commercial codes, can be employed to deal with the extreme material anisotropy, obtaining qualitatively good results in both the creasing and folding phases. The used standard model accounts for the extremely high anisotropy by means of embedded shell elements, playing the role of reinforcements in the fibre direction. The matrix is assumed to be isotropic and elastoplastic, with properties determined based on the behaviour in the thickness direction. The adopted plasticity model is a modified Drucker–Prager model with a cutoff on the tensile pressure side, available in the used commercial code. The procedure adopted for the identification of the small number of required material parameters is also discussed. Copyright © 2017 John Wiley & Sons, Ltd.     

薄刀式分切压痕机控制系统的设计

薄刀式分切压痕机是生产包装纸箱所用瓦楞纸生产线中重要的设备,其产品的质量主要是由设备的控制系统优劣决定的。由于传统分切压痕机使用继电器-接触器的控制系统,存在诸多缺点,我们设计了基于PLC的控制系统。首先分析了薄刀式分切压痕机的工作原理及工艺过程,其次进行了控制系统硬件和软件的设计。实践证明:这种控制系统克服了传统控制系统的缺点,从而提高了纸板的整体质量,特别是对包装纸箱生产线上后序印刷质量带来了较大的提高。     

形状记忆聚氨酯的性能及其应用

对形状记忆功能材料的发展,形状记忆聚氨酯的性能及其应用的前景作了较详细的介绍,并讨论了形状记忆聚氨酯在纺织领域应用的可行性,它为生产功能性高附加值纺织品提供了一种手段。     

HbNO在发酵灌肠制品中的应用研究

使用猪血和NaNO2制备亚硝基血红蛋白(HbNO),将其代替助色剂NaNO2应用于香肠中,能有效降低香肠中NO2残留量,并提高其铁的含量。进一步添加产香发酵菌和天然抗氧化剂,在增进香肠风味,消除肉毒中毒隐患及抗氧化保质方面起控制作用,从而实现其低硝、高铁、增香、保质、安全的目标。