1100dtex×3聚酯帘布取代1840dtex×2人造丝帘布的研究

本文报道了衡阳橡胶厂研制聚酯帘布并用其取代人造丝帘布的试验研究工作。试验结果表明,产品质量优于GB1171—89标准,用聚酯帘布取代人造丝帘布可取得良好社会经济效益。     

V带帘布的更新换代

就３种Ｖ带用帘布材料进行了性能上的对比分析,介绍了它们所适用的贴胶配方、相对应的加工工艺以及所生产的普通Ｖ带的性能。     

关于帘布层结构和厚度的研究

借助于显微切片对挂胶帘布的结构进行了研究,提出了复胶帘布质量标准应包括的内容。     

降低锦纶帘布损耗的措施

介绍降低锦纶帘布损耗的方法.结果表明,通过采取将立式裁断机定轴刚性传动部分改为链条传动,增大边角料回收利用力度,调整中间卷取的衬布卷支架位置及严格执行操作规程等措施,锦纶帘布平均报废率从9.83%下降为5.65%.     

聚酯浸胶帘布扩幅的工艺控制

从轮胎生产设备、压延工艺控制、胶料配方以及混炼工艺等方面分析聚酯浸胶帘布扩幅的影响因素。压延设备表面旋转的弓形扩布辊主要设置在压延前储布装置进出口处、三指扩幅装置设置在帘布进入主机辊筒覆胶处,合理设置压延张力、温度和速度以及压延用锦纶6或锦纶66导布、各规格纤维压延帘布在幅宽上保持一致,合理设计胶料配方和混炼工艺,均有助于稳定聚酯浸胶帘布幅宽。     

压延钢丝帘布常见问题及控制

分析全钢载重子午线轮胎压延钢丝帘布常见问题,并提出相应控制措施。通过采取稳定压延速度,保证胶料混炼均匀,合理设计胶片厚度、辊距和辊筒挠度变形补偿参数,规范钢丝帘线锭子绕线、导开、拉线和排线等操作及电磁控制尾丝张力等措施,提高钢丝帘布压延工艺控制水平。     

聚酯帘布压延质量控制

介绍了聚酯帘布压延中聚酯帘布质量，混炼胶质量和压延工艺的控制情况，在聚酯帘布性能指标中对压延质量影响最大的是断裂强力不均匀率，断裂伸长不匀率及含水率，应分别控制其不超过4％，5％和1％，混炼胶的门尼粘度应为45－60，另外，还应严格控制压延工艺。     

Determination of moisture content in sunflowers with electronic moisture meters

Accurate estimates of moisture content in sunflower seeds (achenes) with electronic moisture meters require that the sample be adequately equilibrated before testing. Seed which has undergone a rapid drying of the hull (pericarp) surface and is tested without sufficient equilibration time will indicate a moisture content that is 0.2–2.0 percentage points lower than the true moisture content. Seed can be properly equilibrated by placing them in a sealed container for 12 hr. Calibration curves based on quadratic equations provide a better estimate of sunflower seed moisture content over a greater range than do linear equations.     

Determination of moisture content and moisture content profiles in wood during drying by low-field nuclear magnetic resonance

In this article, the low-field nuclear magnetic resonance was used to measure the moisture content (MC) and MC profiles in poplar wood during real-time drying. The T₂ distribution curve at each drying stage measured using the Carr–Purcell–Meiboom–Gill pulse sequence provided detailed information in the dynamic change of free water as well as bound water of the whole wood sample. In addition, a new developed SE-SPI pulse sequence was first used to evaluate the spatially resolved T₂ distribution of the successive nondestructive sliced layer of wood. Combined with the area integration method, the moisture content in each layer was calculated, and the change of MC profiles within wood at the MC above and below fiber saturation point was well reflected.     

水残磷酸二铵水分的快速测定

由美国进口的磷酸二铵 ,被广泛用于我国的农业生产 ,由于装卸、运输环节较多 ,在实际到货中 ,磷酸二铵被水残损是经常发生的事件。残损的磷酸二铵其水分项目的检测方法目前国内外尚未见报道。因为水分含量是准确评估残损化肥价值的重要指标之一、是贬值的主要依据 ,因此 ,研究制定其测定方法是相当必要的。目前 ,对水分项目的检验方法主要有干燥剂真空干燥法、真空烘箱法、烘箱法等。由于水残磷酸二铵含有大量的外在水分 ,样品无法进行粉碎、均样等处理加工。大量的实验表明 ,干燥剂真空干燥法根本无法对之实施检测 ;真空烘箱法的检测时间一…     

简述PET聚酯切片水分的测试

聚酯切片含水量是衡量切片品质的一项重要指标,因此对于测试切片水分含量影响因素的研究十分必要。本文通过比较存放时间及不同测试方法对PET聚酯切片含水量的影响,发现存放时间与切片水分含量成正比,使用真空烘箱法与电热鼓风干燥箱法对测试结果无显著性差异,使用卤素水分仪测试切片水分结果比重量法平均高出0.02%左右。     

Control of the hydrocellulose film drying process using a rapid method of moisture content determination

Conclusions A quick-method of determining the moisture content of hydrocellulose film has been developed, which makes it possible to carry out measurements in 10–15 min, with a meansquared error of ±0.4% (absolute).A method has been suggested for calculating corrections for moisture exchange of a specimen with the surrounding medium during the time of withdrawing it; it offers the possibility of determining moisture content of the film in a roll.A system for stabilizing the moisture content of film has been included in the composition of the automatic control system for cellophane manufacture at the Kiev Khimvolokno PO.Translated from Khimicheskie Volokna, No. 2, pp. 57–59, March–April, 1988.     

Determining the moisture content of refractory concretes

Conclusions A portable apparatus was developed for measuring the moisture content of concrete at temperatures up to 200°C. The accuracy of the measurements is ±0.3 abs. %.The apparatus was tested on the main types of refractory concrete. Results were satisfactory.