plc的英文翻译
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ISSN (Print) : 2320 – 3765
ISSN (Online): 2278 – 8875
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering
Vol. 2, Issue 7, July 2013
Copyright to IJAREEIE www.ijareeie.com 3281
Control, Automation and Monitoring Of
Hardboard Production Process Using PLC-
SCADA System
Bindu.K.P
1
, Jayasree.N.R
2
, Sreenivasan.E
3
PG Student [I&C], Dept. of EEE, MES College of Engineering, Kuttipuram, Kerala, India
1
Associate professor, Dept. of EEE, MES College of Engineering, Kuttipuram, Kerala, India
2
Head of Research & Development wing, The Western India Plywoods Ltd, Valapatanam, Kerala, India3
ABSTRACT: Human necessities are increasing day by day where as the factories are running out of resources. To
meet these demands industries need to improve the quality and quantity of their production. Programmable logic
controllers (PLCs) have been used for many decades for standard control in industrial and factory environments. Over
the years, PLCs have become computational efficient and powerful, and a robust platform with applications beyond the
standard control and factory automation. This paper deals with a hardboard industry designed automatic with the help
of PLC. This paper focuses on an innovative and intelligent monitoring system of process using SCADA (Supervisory
control and data acquisition).
Keywords: Automation, Hardboard production, PLC, SCADA, Hot press
I.INTRODUCTION
Hardboard is often referred to as “masonite”. In a most real sense “hardboard” is hard board. It is made in sheets in a
wide variety of thicknesses but most commonly 1/8” to 1/4”. It is made from wood but is denser. Placed in water many
hardboard products will sink or barely float. It is hard on saws. Beyond this simple explanation, hardboard is a very
complex commodity. Average characteristics of hardboard produced by one plant often are vastly different from those
produced by another.
Hardboard manufacture [5]consists of breaking down wood into its basic fibers then putting the wood back together
with the fibers rearranged to form hard panels which have their own set of separate and distinct characteristics.
Fiberizing of the wood is accomplished by a variety of methods but basically they consist of steaming chips to soften
them followed by grinding between abrading discs to tear the fibers apart. Green wood is about 50% water. This water
plus any added in the process must be removed before hardboard manufacture is complete. The method and time of
water removal is what distinguishes the various hardboard manufacturing processes.
Wet process manufacture includes adding water during the fiberizing process to make pumpable slurry of wood fiber.
This slurry is delivered to a screen where water is drained from the fiber leaving a soft mushy mat. More water is
removed by vacuum and pressing between rolls. The wet mat, now able to support it-self, is cut to length and placed on
another screen which carries it into a hot press. These hot presses usually have 20 or more “decks” or openings. They
are capable of applying several thousand tons of pressure to the wet mats while heating it to a temperature of 35OºCor
more.
When fully loaded the press is closed and quickly brought to high pressure, A torrent of water is squeezed out of the
mat through the carrying screens and cascades over the edge of the platens. In a few seconds, water remaining in the
mat is heated to steam. Press pressure is reduced and held for several minutes while the rest of the water is evaporated,
the board is reduced to the desired thickness, and the chemical reaction to reconstitute the lignin bond is completed.
The press is unloaded, the screens peeled off and we have S1S (smooth one side) hardboard, or traditional “Masonite’:
smooth on the face with a screen pattern on the back. Additional operations are necessary to make it practically usable,
but the process of “making hardboard” is complete at this point.
This paper deals with design and implementation of monitoring and control of different process in Hardboard
production using Programmable logic controllers [7] and the Scada systems.
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