共查询到20条相似文献,搜索用时 125 毫秒
1.
网络丝的生产,是近几年内才发展起来的新技术。涤纶低弹网络丝在机织时不用上浆;可以生产各种混纤丝和生产各种具有仿棉型、仿毛型、仿丝型特点的织物。网络丝的加工原理是利用压缩空气喷嘴进行气流加工,使压缩空气的气流方向垂直于涤条的轴向,对丝束进行喷射、冲击 相似文献
2.
3.
压缩空气可以在许多领域使用,同时油经常会产生不希望有的影响: -变形纱:这里纱线被O型喷嘴喷出的压缩空气所变形.油的出现会阻塞喷嘴,引起生产中断. 相似文献
4.
一、引言为开发原有的纤维品种,缩短加工工序、降低成本、提高效益,各纤维生产者致力于新纤维品种的开发。其中网络加工技术发展较快,并在生产中得到了广泛的应用。网络丝加工技术就是利用压缩空气在喷嘴中形成涡流,使纤维束开松、交缠形成网络点,使丝在后加工 相似文献
5.
6.
7.
8.
2 主喷嘴在异形筘式的喷气织机上,引纬工作是由主喷嘴和若干个辅助喷嘴共同完成的。主喷嘴的作用有两点:(1)将进入主喷嘴的压缩空气,按工艺要求进行调制、加速并充分地作用于纬纱表面,使纬纱从静止加速到引纬所需的飞行速度;(2)将纬纱输送到异形筘槽内并确定纬纱正确进入... 相似文献
9.
10.
11.
12.
《International Journal of Food Science & Technology》1969,4(4):307-318
Summary. The importance of food pack thickness in forced convection ovens is shown in relation to production rates. For ovens operated on a batch basis, a pack thickness of 16 mm was recommended, and for ovens operated on a continuous basis, a pack thickness of 10 mm was recommended.
A method for evaluating forced convection ovens was developed and applied for five commercially available ovens which were then compared. the ovens with fans external to the oven cavity and with the air flow ducted across the trays were superior to the ovens with fans built into the oven cavity. the fastest reheating was 25 min for the ducted air type and 35 min for the stirred air type. the most uniform reheating occurred in the ducted air type of ovens. 相似文献
A method for evaluating forced convection ovens was developed and applied for five commercially available ovens which were then compared. the ovens with fans external to the oven cavity and with the air flow ducted across the trays were superior to the ovens with fans built into the oven cavity. the fastest reheating was 25 min for the ducted air type and 35 min for the stirred air type. the most uniform reheating occurred in the ducted air type of ovens. 相似文献
13.
针对传统压缩式制冷空调用于学生公寓时,存在电力负荷大、初期投资高等问题,提出了以冰为冷源的冰制冷学生公寓空调,采用热管换热器将冰的冷量传递给室内空气;空调主体由贮冰容器、热管式换热器和风机构成,冰由校外企业在谷值电阶段制取并配送。给出了贮冰容器上置型和下置型2种空调结构及其原理和特点;对贮冰容器、风机和采用重力式热管的热管换热器进行了设计计算;对热管式冰制冷学生公寓空调的成本、电功率、变工况性能进行了计算分析。结果表明,热管式冰制冷学生公寓空调电功率仅为普通空调的1/20,成本为普通空调的1/4,很适于在学生公寓中应用和推广。 相似文献
14.
D.R. PANGAVHANE R.L. SAWHNEY P.N. SARSAVADIA 《Journal of Food Processing and Preservation》2000,24(4):335-352
A batch type experimental dryer with online weighing mechanism was developed for studying thin layer drying kinetics of Thompson Seedless grapes under the entire range of controlled drying air conditions expected to be used in commercial drying of grapes. Thin layer drying rates of grape berries pretreated with commercial dipping oil were experimentally determined at four levels of drying air temperature (50, 60, 70 and 80C), four levels of airflow velocity (0.25, 0.50, 0.75 and 1.00 m/s) and three levels of air relative humidity (13, 18 and 23%). the Page's equation drying rate constants k and N were obtained for each experimental run conditions. Correlations of drying rate constant k with drying air condition variables T, V and H was determined in terms of Arrhenius type model and power model. the obtained data fitted well in to the Arrhenius type model compared to power model. 相似文献
15.
16.
新型碱炉一般采用三层供风系统。合理的三次供风的风量分配,合适的二次风分布,适宜的温度、压力和烟气残氧量,可以减少碱炉飞灰形成,延长碱炉的运行周期,以达到碱炉安全、连续、高效地运行。 相似文献
17.
18.
阐述了热风非织造布常用的双组分热熔纤维的种类、形态结构和粘合原理。通过材料吸水性能的测定,分析了不同面密度热风材料的吸水量差异,并探讨了作为个人卫生护理用品的热风非织造布面层和导流层所起到的传递液体和阻隔液体的作用。 相似文献
19.
为解决透气度流量盘测量方法因气路中的位置差异和大气压力变化对流量盘测量结果产生影响,对流量盘测量方法进行了改进。将流量盘在测量气路中的位置由在气体流量计前改为在气体流量计后,并把流量盘分为线性流量盘和非线性流量盘,计算大气压力对非线性流量盘测量结果的影响;比较了改进前后测量方法的重复性和稳定性,并采用改进后测量方法参加了CORESTA组织的流量盘共同实验。结果表明:①改进测量方法后非线性流量盘测量结果的标准偏差和变异系数以及5个月内测量结果的极差均减小了一半左右。②国内ZTRI实验室测量的流量盘流量均值与国外3家实验室测量的流量盘流量均值的相对极差都在2%以下;国内外4家实验室测量每个流量盘的流量变异系数均小于0.50%。 相似文献
20.
ELIZABETH JOUBERT ZALDEUS STEENKAMP RIKUS MÜLLER 《Journal of food process engineering》1998,21(5):427-439
A test unit for the small-scale fermentation and drying of rooibos tea was developed to simulate deep bed fermentation and drying of the tea in practice. The data acquisition and control system consisted of an AT type personal computer interfaced with the test unit by a plug-in type AD/DA board. Set points such as temperature, relative humidity and velocity of the inlet air could be specified for eight sequential, variable time intervals. Good control of dry bulb temperature and velocity of the inlet air was obtained, taking into account the restrictions placed on the system by the hardware. The maximum air velocity that can be used with a bed depth of 50 mm, without formation of voids, was determined as 1.8 m/s. Precautions should be taken to ensure uniform air distribution and bed depth. Good quality tea was obtained after fermentation and drying in the test unit. 相似文献