浅谈印花调色的问题与改进

国内许多印染企业印花生产，都不同程度存在印花调色时间长、印花色差问题，特对此现状问题详细分析。提出的改进措施是，进行印花调色技术培训和加强调色管理，以促进印花调色水平快速提高。     

涂料印花调色质量控制

文中分析了涂料印花调色存在的问题及其影响因素,根据实践经验提出了具体措施,通过改变观念、加强调色培训,认真打样仿色、提高翻单复样的准确率以及采用计算机调色、重视调色基础管理等方法提高印花调色质量,为企业印花生产高质量、快交货提供参考.     

纺织品数码印花色彩管理研究及实践

纺织品数码印花是用屏幕进行调色的,但屏幕显示的色彩与最终成品的色彩往往存在较大差异。如何建立起一套成熟的色彩管理系统,使得屏幕色彩与成品色彩一致,消除调色、打样与最终产品的色差是数码印花企业的追求。文章以万事利公司的数码印花色彩管理研究和实践为样本,剖析了纺织品数码印花难以做到“所见即所得”的原因,阐述了色彩管理机制、色彩管理流程及其实施方法,突出了纺织品数码印花色彩管理系统建立的重要性。     

印花图案调色方法探究

正近几年来,我国印花行业不断壮大,印花技术也在高速发展。从传统的圆网印花、平网印花、台板印花和转移印花等技术上的突飞猛进,到数码印花的风生水起,无不预示着印花新时代的到来。然而,在印花行业快速发展的今天,在各种印花工艺进步的同时,该行业中的短板——印花图案的配色调色成为许多印花企业的软肋。笔者通过对印花企业的调色难题的分析,深入探究用电脑进行调色配色的方法,     

数码印花的调色方法简介

颜色调整是数码印花的一个重要环节，文中简单介绍了几种用于数码印花的调色方法，包括屏幕显示法、色卡调色法、测色调色法、经验调色法、中心色调色法、数字调色法及组合调色法等，以达到预期的颜色。     

羊绒针织品拔染印花实践

针对羊绒针织品拔染印花中易出现色泽灰暗、印花色差、重现性差等问题,通过实验分析了羊绒针织品拔染印花工艺中拔染剂和印花后放置时间对白度、重现性等的影响,提出相应生产控制要点,并检测了生产结果。结果表明,采用氯化亚锡为拔染剂,严格控制印花后放置时间,按照生产工艺控制,产品的合格率在96%以上,产品色牢度达3级以上,色差4级以上,质量指标符合国家标准要求。     

纯棉活性印花织物色差原因分析及改进

分析了前处理、印花和后整理工艺中,影响棉织物活性印花产生色差的因素。重点讨论了色浆处方和印花工艺条件对色差的影响;对于固色和阻燃等后整理中难以克服的色差问题,指出了相应的控制措施。     

活性染料数码直喷印花应用问题的探讨

根据数码印花的生产实践,分析了活性染料数码直喷印花技术应用的现状,总结了活性染料直喷印花在生产应用过程中存在调色方法不科学、颜色重演性较差、颜色鲜艳度不高、无法按花型调节墨滴大小、上浆体系不够完善等几大问题,通过分析这些问题存在的原因,提出了相应建议,以引起从事活性染料数码直喷印花及其相关技术人士的关注,并引导数码印花的设备生产和工艺技术的改进和提高,全面提高数码印花的产品质量。     

纯棉绒布圆网印花工艺

针对绒布印花的特点,采用各种方法,解决和改善绒布印花经常出现的刀线、塞网、左右色差等疵病,提高印花绒布的品质。     

织物印花质量在线检测与控制系统的设计

针对网目调织物印花中存在的色差和目视检测印花颜色质量缺乏可靠性和重复性的缺陷,设计了适用于网目调织物印花质量自动检测与控制系统的模型。通过自行设计的颜色一致性检测测控条,获得在线印花织物颜色信息和织物质量产生的原因。根据织物特性,对均匀颜色空间中的色差计算公式进行理论分析和实验验证,得到适合织物颜色一致性检测的色差计算公式,为在线印花闭环控制提供判定和控制依据。经过论证和实验,该方法和技术可以客观地、快速准确地进行印刷质量控制,提高生产效率,有实际应用价值。     

浅论印花色差的成因及预防

本文较系统地分析了印花色差的种类及产生色差的各种复杂因素，提出了预防和修正色差的多种措施，对合理制订印花工艺和减少色差疵病，具有一定的参考价值。     

In-Line Estimation of the Standard Colour Index of Citrus Fruits Using a Computer Vision System Developed For a Mobile Platform

A key aspect for the consumer when it comes to deciding on a particular product is the colour. In order to make fruit available to consumers as early as possible, the collection of oranges and mandarins begins before they ripen fully and reach their typical orange colour. As a result, they are therefore subjected to certain degreening treatments, depending on their standard colour citrus index at harvest. Recently, a mobile platform that incorporates a computer vision system capable of pre-sorting the fruit while it is being harvested has been developed as an aid in the harvesting task. However, due to the restrictions of working in the field, the computer vision system developed for this machine is limited in its technology and processing capacity compared to conventional systems. This work shows the optimised algorithms for estimating the colour of citrus in-line that were developed for this mobile platform and its performance is evaluated against that of a spectrophotometer used as a reference in the analysis of colour in food. The results obtained prove that our analysis system predicts the colour index of citrus with a good reliability (R ²?=?0.925) working in real time. Findings also show that it is effective for classifying harvested fruits in the field according to their colour.     

Impact of dietary carotenoid and packaging during frozen storage on the quality of rainbow trout (Oncorhynchus mykiss) fed carotenoids

BACKGROUND: The storage life of frozen salmonids is often limited primarily by oxidation and flesh discolouration due to carotenoid degradation. The objective of this research was to determine the carotenoid changes and therefore the muscle colour modifications during 6 months of frozen storage (?18 °C) of whole rainbow trout fed astaxanthin (100 ppm) or canthaxanthin (80 ppm), kept under two different packagings: plastic film and cardboard box. RESULTS: After 6 months of frozen storage, the carotenoid type effect was seen for dry matter while there was no packaging material effect on carotenoid, total lipids, and TBARS contents of trout fillets. The time under frozen storage had an effect on carotenoid and TBARS fillet concentration. The carotenoid‐type effect was noted for the four colour parameters (lightness difference, chroma difference, hue angle difference, and total colour difference) of rainbow trout fillet, while the packaging material effect was observed only for chroma. Frozen storage time had an effect on the four colour parameters of rainbow trout fillet. CONCLUSION: Carotenoid and packaging material effects were more marked for colour parameters than for biochemical parameters. In this study, as fish were frozen and stored as whole fish, fish skin provided good protection against oxidation. Copyright © 2011 Society of Chemical Industry     

纱线色差的产生和预防

系统分析了纱线色差的产生原因、预防措施以及对产品质量的影响。分别阐述了原棉的选配、混合效果、纱线捻度等的因素对色纺纱线和彩棉纱线色差影响和预防措施。     

减小活性染料浸染大小样深度差的技术措施

实验表明，活性染料浸染时，在染温、助剂准确控制的前提下，造成大小样深度差的因素，除浴比的差异因素外，小样的染色时间（主要是固色时间）短未能达到染色平衡，是第二大影响因素。由此，打小样要和放大样一样，染色时间要充分，必须实现染色平衡。如果将染色温度提高到65～70℃，可明显缩短达到染色平衡所需的时间。而且，又可保持良好的得色深度与匀染透染效果。     

A computer based system for matching colours during the monitoring of tea fermentation

The design and development of a personal computer (PC) based system for monitoring changes in colour during the fermentation process that is used to produce tea is described. The technique is based on imaging the fermenting tea at different intervals of time and processing the colour images. A digital camera, together with a special lighting arrangement, was used to capture colour images during the fermentation process. The RGB colour model was used so that histogram dissimilarity measurements matched the colour of test images to a standard image colour. This dissimilarity measurement was represented by difference from the Manhattan norm (L1). The technique was compared with the visual methods used by expert tea tasters.     

硫化染料灯芯绒轧染工艺探讨

硫化染料以其深浓的色泽、低廉的价格成为灯芯绒染色的常用染料，但由于染料颗粒大小、溶解性、水量等因素，尚存在色差。采用初开车冲淡可达到平衡，克服色差，经过实践有很高的经济效益。     

Robust colour calibration of an imaging system using a colour space transform and advanced regression modelling

A new algorithm for the conversion of device dependent RGB colour data into device independent L*a*b* colour data without introducing noticeable error has been developed. By combining a linear colour space transform and advanced multiple regression methodologies it was possible to predict L*a*b* colour data with less than 2.2 colour units of error (CIE 1976). By transforming the red, green and blue colour components into new variables that better reflect the structure of the L*a*b* colour space, a low colour calibration error was immediately achieved (ΔE(CAL) = 14.1). Application of a range of regression models on the data further reduced the colour calibration error substantially (multilinear regression ΔE(CAL) = 5.4; response surface ΔE(CAL) = 2.9; PLSR ΔE(CAL) = 2.6; LASSO regression ΔE(CAL) = 2.1). Only the PLSR models deteriorated substantially under cross validation. The algorithm is adaptable and can be easily recalibrated to any working computer vision system. The algorithm was tested on a typical working laboratory computer vision system and delivered only a very marginal loss of colour information ΔE(CAL) = 2.35. Colour features derived on this system were able to safely discriminate between three classes of ham with 100% correct classification whereas colour features measured on a conventional colourimeter were not.     

缩小轧染仿色小样与大车生产的差距

本文分析了影响化验室仿色小样与大车放样差异的因素。在试验的基础上，提出了缩小大小样之间差异的有关措施，从而使大小样之间能够相符或在色差以内。     

CVC混纺针织物中浅色一浴法浸染工艺实践

CVC混纺针织物中、浅色的一浴法浸染生产中常出现的色花、色差、色变的问题，可用日本东棉化药公司生产的AQ-LE型分散染料与CN型活性染料搭配的一浴法浸染工艺来解决，强调煮漂和染色生产中必须注意的工艺和操作，并提出了色深、色浅的一些回修措施。