Press controls

Press control is critical it is essential that the elastomeric compound reaches the required cure state to optimize product performance yet remains in the press the shortest time period to maximize productivity. To meet this objective, both compression and injection presses now use microprocessor controls, which enable variations in platen temperatures and compound cure characteristics to be accommodated without sacrificing product performance or productivity. 

Add wood furnish (384 g, moisture content 6.02%) to the bowl of a rotary blade paddle mixer (such as a Kitchen-Aid KSM90) and agitate at the lowest speed setting. Add Mondur 541 (7.39 g, 1.9% w/w, a polymeric diphenylmethane diisocyanate of 31.5% NCO, Bayer) dropwise over a 5-min period using a disposable syringe. Continue blending for an additional 10 min and then transfer the blend to an 8 x 8 x 2 -in. metal form at the bottom of which is a metal plate which fits inside. The resin-coated furnish is evenly spread inside the form and another metal plate is placed on top. All parts of the form and plates are presprayed with mold release. The completed form assembly is placed into a hydraulic press (such as a model PW-22 manufactured by Pasadena Hydraulics) with platens heated at 350°F. The furnish is then pressed between the two form plates to a thickness of j in. Press controls are used to ensure consistency of board thickness. The assembly is heated for 4 min. before demolding the cured wood panel. 

Step 9. Now that you have entered all the data you do not hit the OK button but instead press Control-Shift-Enter. 

The image may be translated along the x and y axes by pressing control and the right mouse button. 

LINEST(B2 B5,A2 A5,TRUE,TRUE) appears once again in the formula line. Now press CONTROL+SHIFT+ENTER on a PC or COMMAND(3 )+RETURN on a Mac. Excel dutifully prints out a matrix in cells E3 F5. Write labels around the block to indicate what is in each cell. The slope and intercept are on the top line. The second line contains sm and sh. Cell F5 contains sv and cell E5 contains a quantity called R2, which is defined in Equation 5-2 and is a measure of the goodness of fit of the data to the line. The closer R2 is to unity, the better the fit. 

Figure 4-13 implements least-squares analysis, including propagation of error with Equation 4-27. Enter values of and y in columns B and C. Then select cells B 10 02. Enter the formula = LINEST(C4 C7,B4 B7,TRUE,TRUE) and press CONTROL+SHIFT+ENTER on a PC or COMMANDS + RETURN on a Mac. L1NEST returns m, b, sm, sb, R2, and sY in cells B10 C12. Write labels in cells A10 A12 and D10 D12 so you know what the numbers in cells B10 C12 mean. 

Press CONTROL+SHIFT+ENTEFt on a PC or COMMAND+RETURN on a Mac ... 

To use the template in Figure 19-5, enter the coefficients, eb, measured from the pure compounds, in cells B5 C6. Enter the absorbance of the unknown in cells D5 D6. Highlight cells F5 F6 and type the formula =MMULT(MINVERSE(B5 C6), D5 D6j . Press CONTROL+SHIFT+ENTER on a PC or COMMAND(3 )+RETURN on a Mac. The concentrations [XI and [Y] in the mixture now appear in cells F5 F6. 

The term process control has often been used when machine control is actually performed. As the knowledge base of the fundamentals of the molding process continued to grow, the control approach is moving away from principally press control and closer to real process control where material response is monitored and then moderated or even managed (Chapter 3). 

Figure 5 shows scanning electron micrographs of hot-pressed control and esterified kenaf fiber. The control fiber (a) shows little tendency to thermally flow under the pressure of the hot press at 190 C whereas the esterified fiber... 

Occasionally you will not be sure of the arguments and their proper order. If you type the function name in a worksheet cell and then press CONTROL+A, you will go directly to the Step 2 dialog box. You can then enter values for the function s arguments. 

In the same way that a worksheet formula can contain a simple constant, e.g., the value 3 in the formula =3 A1+A2, an array formula can contain an array constant. An array constant is included in a formula by enclosing the array of values in braces. In this case you must type the braces. When you enter the completed array formula by pressing CONTROL+SHIFT+ENTER, Excel automatically provides braces around the whole formula. 

To edit an array formula, simply select any cell in the array. Then edit the formula in the formula bar. When you begin to edit, the braces surrounding the formula will disappear. To re-enter the edited formula, press CONTROL+SHIFT+ENTER. The formula will be entered into all of the cells originally selected for the array. 

To use a worksheet formula that returns an array result, you must first select a suitable range of cells, with dimensions (R x C) large enough to accommodate the returned array, then type the formula in the formula bar, and finally enter the formula by pressing CONTROL+SHIFT+ENTER. Excel will indicate that the formula is an array formula by enclosing it in braces and will enter the array formula in all the selected cells. 

The formula is an array formula in order to get the correct answer, you must remember to press CONTROL+SHIFT+ENTER. 

To find the number of students whose YOG = 96, we simply have to sum this array of I s and O s. The formula =SUM((YOG=96) 1) is an array formula and you must remember to press CONTROL+SHIFT+ENTER. 

For a large list such as this one, it s convenient to use one of the methods for selecting a block of cells described in Chapter 1 select the first row of cells and press CONTROL+SHIFT+(down arrow) or place the mouse pointer on the bottom edge of the selected row, hold down the SHIFT key and double-click to select all cells to the bottom of the block. Then choose Sort... from the Data menu to display the Sort dialog box. 

The macro can be actuated by using CONTROL+a. If the cursor is placed on the first line of the original data, and CONTROL+a pressed, the data is automatically formatted and the cursor moved down to the next row. Thus, repeatedly pressing CONTROL +a will successively format each line of data. 

You can also type the function name, with or without the opening parenthesis, and then press CONTROL+A or CONTROL+SHIFT+A, as described in Chapter 3. The function placeholder argument will be displayed, highlighted so that you can enter a value or reference (Figure 13-11). 

There are several ways to enable a Function procedure to return an array of values. The most obvious is to assemble the values in an array and return the array. The procedure shown in Figure 15-11 illustrates a function that returns an array of values the letters a, b, c and d in a 2 x 2 array. The function requires no arguments. The user must select a 2 x 2 range of cells, enter the function and press CONTROL+SHIFT+ENTER. 

To use this function the user must select a horizontal range of cells, enter the function, and press CONTROL+SHIFT+ENTER. 

In each of the preceding examples, you must select an appropriate range of cells to contain the result, enter the function, and press CONTROL+SHIFT+ENTER (Excel for Windows) or CONTROL+SHIFT+RETURN (Excel for the Macintosh). 

Near the end of the code some calculations that are specific to the Deming equations are performed. The function returns an array of two values, the slope and intercept of the Deming regression. Since an array is returned, the user must press CONTROL+SHIFT+ENTER (Windows) or CONTROL+SHIFT+RETURN (Macintosh). 

This article provides the basic information necessary to understand the general process of tablet formation. General machine design characteristics and tablet press nomenclature are presented. Tablet press control systems and process automation are discussed, followed by process and product troubleshooting on tablet compression equipment. 

In mid-1980s, custom-made press monitoring systems were described, ° and the first commercial instrumentation packages became available, including both the systems for product development and press control. The first personal computer-based tablet press monitor was sold in 1987, and the first Microsoft Windows-based press instrumentation package in 1995. 

Lewis, D.A., Pharmaceutical Tablet Press Control Mechanism. US Patent 4,817,006, 1989. 

Press CONTROL-D to create a series of DATA statements from the current sprite in memory. Just tap the key, or you ll get hundreds of DATA statements as the key repeats. Sprite Magic will create eight DATA statements, with eight bytes per line. The last byte is not strictly used. Sprite shapes are made... 

P j from 63 bytes, but the sprite areas are padded so that they ll conveniently fall in 64-byte ranges. To create DATA statements for another sprite, use the + or — key to move to the correct sprite page then press CONTROL-D again. 

To exit Sprite Magic and return to BASIC, press CONTROL-X. You can also use RUN/STOP-RESTORE. 

A very useful command, CONTROL-D, allows you to create DATA statements for whatever characters you ve defined. Ultrafont + doesn t make DATA statements for all the characters, just the ones you ve changed. After you press CONTROL-D, Ultrafont 4- adds the DATA statements to the end of whatever program you have in BASIC memory. If there is no program, the DATA statements exist alone. 

You can load Ultrafont +, enter NEW to reset some BASIC pointers, load a program you re working on, then SYS 49152 to Ultrafont -t- to add DATA to the end of the program. The DATA statements always start at line 63000, so you may want to renumber them. If you press CONTROL-D twice, another set of DATA statements will be appended, also numbered from line numbers 63000 and up. Since the keys repeat if held down, just tap CONTROL-D. If you hold it down, you may find a hundred DATA statements have been created See the notes at the end of this article for more details on using DATA statements in your own programs. 

After you create the DATA, you ll still be in Ultrafont +. If you want to exit to see the DATA statements or go on to other things, press CONTROL-X. The screen will reset to the normal colors and you ll see the READY, prompt. If you ve made DATA, a LIST dramatically reveals it. It s best to enter the command CLR to make sure BASIC is initialized properly after creating DATA statements. One thing to watch out for Don t use RUN/STOP-RESTORE to exit Ultrafont +. The program moves screen memory from the default area at address 1024, and the RUN/STOP-RESTORE combination does not reset the operating system pointers to screen memory. If you do press it, you won t be able to see what you re typing. To fix it, blindly type POKE 648,4 or SYS 49152 to reenter Ultrafont + so you can exit properly. 

Rarely, you ll see a solitary letter of the alphabet enclosed in braces. These characters can be entered by holding down the CONTROL key while typing the letter in the braces. For example, A would indicate that you should press CONTROL-A. 

C. During the computer s startup, press Control + Shift + Escape. 

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