Color control

Plasma processing technologies ate used for surface treatments and coatings for plastics, elastomers, glasses, metals, ceramics, etc. Such treatments provide better wear characteristics, thermal stability, color, controlled electrical properties, lubricity, abrasion resistance, barrier properties, adhesion promotion, wettability, blood compatibility, and controlled light transmissivity. 

Colorimeters. Also known as tristimulus colorimeters, these are instniments that do not measure spectral data but typically use four broad-band filters to approximate the jy, and the two peaks of the x color-matching functions of the standard observer curves of Figure 7. They may have lower accuracy and be less expensive, but they can serve adequately for most industrial color control functions. Examples of colorimeters are the BYK-Gardner Co. XL-835 the Hunter Lab D25 series the Minolta CA, CL, CS, CT, and CR series (the last of these is portable with an interface) and the portable X-Rite 918. 

The Munsell book standards corresponding to the limiting colors may even serve as material standards for industrial color control. In a material standard system the sample is compared with a standard by eye without the use of any meter or optical instrument. The success and popularity of these systems are largely due to their simplicity of application. The ability of the human eye to compensate for various illuminants and surroundings makes it possible for this system to give results even under mediocre conditions. The most critical work with material standards requires carefully controlled observing conditions. 

We have demonstrated a new class of effective, recoverable thermormorphic CCT catalysts capable of producing colorless methacrylate oligomers with narrow polydispersity and low molecular weight. For controlled radical polymerization of simple alkyl methacrylates, the use of multiple polyethylene tails of moderate molecular weight (700 Da) gave the best balance of color control and catalyst activity. Porphyrin-derived thermomorphic catalysts met the criteria of easy separation from product resin and low catalyst loss per batch, but were too expensive for commercial implementation. However, the polyethylene-supported cobalt phthalocyanine complex is more economically viable due to its greater ease of synthesis. 

Therefore, the spectral phase v) and consequently the group delay GD(v) for each color controls the temporal shape of the pulse. These important relations are summed up in Figure 7.4. 

The precision and accuracy of instrumental color measurements and the associated color tolerance can provide a system of control that equals that of an experienced color matcher. But to achieve this performance, the product standard and production test specimens must be of the highest quality. As was pointed out, more than two decades ago, the weak link in instrumental color control is the specimen. The human visual system can scan a specimen marred by many inconsistencies and the human mind will ignore those features that are not relevant to the job at hand. A analog or digital colorimeter cannot ignore those defects. A spectrocolorimeter is a tool for the color matcher but it is not a hammer. It needs to be treated like the precision instrument it is. A mold-maker would never use his or her tools in a dirty... 

The plastic color standard is the reference color control to which all color match trials are visually compared. In some cases, the standard must be returned with the match or after the match is approved. The ideal situation is to keep the color standard, labeled with the customer identification number, the in-house color number, date, and polymer type, if known. Handling, storage, age, texture, gloss, shape, size, and physical form all determine the condition of the color standard both as received and for future reference purposes. 

ROOT OF BATCH-TO-BATCH VARIABILITY WITHIN COLOR CONTROL TESTING FOR COLOR VARIATION... 

The AIAG did lay an excellent foundation for exploring true product or process variations in relationship to batch-to-batch color control. First they recommended less than 30% measurement error. If the combined sampling, test, and color measurement error exceeds 30%, then one needs to further examine the problems within their gage system. ... 

Process Color Control Using Hunter, CIE. CIVIC DE 389... 

Because color is three dimensional, the majority of pigment manufactures and their customers have settled on one of two color languages. When one describes batch color control, colorists generally use Hunter or CIE Lab values. Some variations might include CIE LCH lightness, chroma, and hue. 

If your old batch color control system is in Hunter and you want to convert to CMC, the first step is to transform all old DLab values back into tristimulus XYZ values. 

There are other difficulties with the INPUT statement as well. Quotation marks are not handled correctly. Leading and trailing spaces are stripped away. INPUT also allows people to use all the cursor and color control keys. Theoretically, you can place the cursor anywhere on the screen where there is something you want to INPUT, and press RETURN. In effect, this is what happens when you edit a program (the same INPUT routine is used by both the system and BASIC). But it just makes no sense to allow cursor moves all over the screen when you simply want the user to answer a question. If the user accidentally presses a cursor key and then tries to move the cursor back, the entire line, including any prompts, is read. 

Refer to the following table when entering cursor and color control keys ... 

Understanding the role of chemical modification of wood and wood surface in controlling the outdoor weathering process is significant to the future use of wood exposed to the outdoors. The role of modification will become larger as greater demands are placed on the newer wood-based products. The future of such modification lies in end-product property enhancement. Permanently bonded chemicals that provide UV stabilization, color control, water resistance, and dimensional stability could enhance outdoor performance greatly. 

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