影响氟醚橡胶脆性温度的试验因素

按GB/T 1682-1994规定的方法测定了硫化压力、试样裁切方向对氟醚橡胶脆性温度的影响。结果表明:氟醚橡胶的脆性温度不仅与硫化压力有关,而且与试样的裁切方向有关。一般情况下,氟醚橡胶的脆性温度随着硫化压力的增大而略有上升,其垂直压延方向的脆性温度比平行压延方向的脆性温度要低1～2℃,这说明氟醚橡胶具有压延效应。     

节能型超级压光机液压系统改进设计

针对目前造纸行业中还有许多老式的超级压光机没有快速分离功能的问题,而没有快速分离功能容易造成纸箔辊损坏,重新设计后的液压系统中增加快速分离部分,一旦断纸可以保护纸辊。本文对改进后液压系统的工作原理和特点进行了分析。     

巨型工程机械子午线轮胎钢丝帘线应用研究

介绍巨型工程机械子午线轮胎常用的钢丝帘线,对其中几种帘线的性能进行检验,并用于实际生产。结果表明,钢丝帘线在压延、裁断和成型过程中工艺性能稳定,轮胎成品达到了设计要求,实际使用也取得了理想效果。建议开发生产更高强度、全渗透型简单化、开放式结构帘线并提高帘线的抗疲劳性能等。     

橡胶制品生产设备使用维护技术讲座（四）

介绍了开炼机和纤维压延机的使用范围、技术参数、设备完好标准等。总结分析了密炼机上辅机和双螺杆挤出压片机的日常维护保养规程和注意事项。介绍了密炼机上辅机和双螺杆挤出压片机的检修、试车与验收的各项工作。分析了一些检修方法和质量标准。     

Paper‐derived stoneware ceramics: Improvement of properties by calendering and evaluation of pyroplastic deformation behaviour

Paper‐derived ceramics are a new approach to produce thin, lightweight ceramic structures. These ceramics are derived from preceramic papers produced in a paper technological process. The amount of inorganic filler (e. g. stoneware) in the paper is increased up to 85 wt‐%. By firing at high temperatures the cellulose fibres are pyrolized and the inorganic content is sintered. One part of the technological process to produce papers is calendering. A calender consists of two rolls, between which the paper is rolled under pressure. By calendering the paper thickness is reduced and the surface of the paper is improved. Different calender parameters (pressure and temperature) are applied to the preceramic paper and ceramic properties like strength, density and surface roughness are investigated. The strength of paper‐derived stoneware ceramics can be improved by 125% to over 185 MPa by optimizing the calender process. Additionally paper‐derived stoneware ceramics were fired at 1180°C, 1200°C and 1220°C for 1 and for 2 hours at different support distances (10–150 mm) in order to determine the dependence of pyroplastic deformation on support distance. The results show a linear increase between maximum deformation and support distance by 1 hour dwell and a polynomic at 2 hours dwell. Furthermore the Pyroplastic Index (PI) was evaluated according to recent literature. The Pyroplastic Index was correlated to the amorphous content of the differently fired samples. With longer dwell and/or higher temperature the content of amorphous phase increases which lowers the bulk viscosity and supports the pyroplastic deformation. These investigations should give a direction for using paper‐derived stoneware ceramics for special design applications. Paper‐derived ceramics can be systematically deformed in many possible ways to achieve specific shapes.     

复合材料压延工艺和设备的探讨

本文对废砂——塑复合材料压延工艺和设备作了简明的分析和研究,确定了压延成型的必要条件,分析了在压延过程中的主要力能参数和选择电机的重要条件,并对压延机工作机座刚度及应力分布进行了分析,提出了结构设计的意见.     

聚碳酸酯片材的挤出成型与应用

关于聚碳酸酯片材的挤出成型,诸如对树脂的要求、螺杆结构特性、机头类型、压延方法等作了详细的叙述,同时还论述了国内外片材挤出成型的应用领域。     

压延机挂胶帘布厚度自动检测及控制系统

主要叙述了S型四辊压延机厚度自动检测及厚度自动控制系统的研制，着重阐述该系统结构的设计以及厚度自动检测系统中模型的建立。厚度控制软件在常规PID控制的基础上采用增量式调节，控制系统采用了与现场手控完全独立的控制方案，并对生产线描述所需的其它控制参数的数据采集及处理进行了设计。     

热粘合新型轧光机

Parotherm轧光机概念在给定的线负荷范围内可用于很多的热粘合工艺，如纺粘或短纤纤维网的粘合。由于其消极式中心支撑偏差补偿系统，Parotherm轧光机操作方便。它不需要第二个偏差补偿系统。     

压延存料对PVC透明片材质量影响的探讨

根据G.Ardichuili的压延理论,分析了聚氯乙烯压延加工过程中物料的流变行为,指出存料是影响压延透明片材的厚度均匀性、外观质量的重要因素之一。根据产品的厚度、柔软率,正确控制辊隙存料量是提高压延透明片材质量的重要手段之一。