Cutting uncured rubber sheet and slabs cleanly and accurately around the clock - the rotary shear cutter.
For many years, cutting uncured rubber slabs or sheet to length cleanly clean·ly
adj. clean·li·er, clean·li·est
Habitually and carefully neat and clean. See Synonyms at clean.
In a clean manner.
clean and accurately has been a problem in the rubber industry. Several types of cutters have been used with varying degrees of success. Guillotines, pinch-off type cutters, paper cutters and hand cutting with a knife have been the most prominent choices.
Each of these approaches has certain problems Guillotine guillotine
Instrument for inflicting capital punishment by decapitation. A minimal wooden structure, it supported a heavy blade that, when released, slid down in vertical guides to sever the victim's head. cutters are typically slow because the product must be stopped while each cut is made. They are inaccurate, require continual adjustment for a clean cut and require frequent blade resharpening. Most guillotines are used in off-line installations.
Pinch-off type cutters, while faster than a guillotine, require frequent adjustment to ensure a clean cut, and are generally limited to thinner sections. Cut length adjustment is over a limited range beyond which the product will jam or the cut length will become inaccurate. They are most frequently used in on-line installations.
Paper cutters are generally limited to thinner sections or soft materials, require the product to be stopped while the cut occurs and require frequent blade adjustment to maintain clean cuts. These are primarily used for off-line installations. Harder and thicker products are less likely to be cut cleanly because of the forcing apart of the blades.
Hand cutting is still found in a few installations. This is tedious, inconsistent, dangerous and only useful for small batches off-line.
As production requirements have changed, including the need for faster production rates, reduced scrap and more accurate production parameters, the old cutting methods can no longer provide the results needed.
A rotary shear cutter provides the means to increased productivity. It can cut in line with a mill, calender CALENDER. An almanac. Julius Caesar ordained that the Roman year should consist of 365 days, except every fourth year, which should contain 366, the additional day to be reckoned by counting the twenty-fourth day of February (which was the 6th of the calends of March) twice. or sheet extrusion process at line speeds of 100 FPM FPM - Fast Page Mode Dynamic Random Access Memory or faster, and do so accurately and with increased reliability.
The rotary shear cutter is a ruggedly designed and constructed machine that is capable of making clean cuts on uncured rubber sheet and slabs up to 70 inches wide. Whether the rubber is thin or as much as one inch thick, the shear can produce clean, accurate cuts with a minimum of maintenance.
What makes this possible is the design of the cutterhead and stationary blade assembly. The heavy cutter head (Mach.) a rotating head, which itself forms a cutter, or a rotating stock to which cutters may be attached, as in a planing or matching machine.
See also: Cutter and its rectangular cross-section blade are configured to make a scissors-like cut against an identical stationary blade. This arrangement will cut a single sheet of newspaper cleanly across its full width. This cutting action provides clean cuts on thin sections, thick slabs, soft materials, hard or tough materials, and even on rubber sheet on a plastic or paper liner.
The rectangular cutting blades can be turned end for end and turned over using all four edges as a cutting edge. The scissors-like cutting action tends to lengthen length·en
tr. & intr.v. length·ened, length·en·ing, length·ens
To make or become longer.
lengthen·er n. the time between resharpening. Products that are heavily loaded with fillers that are abrasive will shorten the time between sharpening somewhat. Sharpening of the blades is done on a surface grinder A surface grinder is a machine tool used to provide precision ground surfaces, either to a critical size or for the surface finish.
The typical precision of a surface grinder depends on the type and usage, however +/- 0.002 mm (+/- 0. . No jigs or special sharpening angles are required, further reducing the cost of maintenance.
The cutter head is driven by an AC flux vector drive through a heavy-duty gear reducer and HTD HTD Heated
HTD Heat Transfer Division
HTD Haste the Day (band)
HTD High Torque Drive (synchronous belt drives)
HTD HEDS Technology Demonstration (NASA)
HTD Hit The Deck timing belt drive system. A digital controller with encoder A hardware device or software that assigns a code to represent data. See encode.
1. (algorithm, hardware) encoder - Any program, circuit or algorithm which encodes.
Example usages: "MPEG encoder", "NTSC encoder", "RealAudio encoder".
2. feedback provides control of cutter RPM in continuous operating mode to within 0.01% of set speed.
For slow cut rates and/or long cut lengths, a single revolution clutch/brake with integral flywheel driven by an AC motor provides the cutting action. A digital length counter with an encoder allows the operator to set cut lengths in 0.010" increments. Each single revolution cut is made at the rate of 200 RPM and takes about 300 msec.
An integral feed conveyor Conveyor
A horizontal, inclined, declined, or vertical machine for moving or transporting bulk materials, packages, or objects in a path predetermined by the design of the device and having points of loading and discharge fixed or selective. and hugger belt assembly guides the product to the cut point. An integral discharge conveyor carries cut pieces away from the cut point. These conveyors are driven by a DC or AC flux vector drive system. A freestanding free·stand·ing
Standing or operating independently of anything else: a freestanding bell tower; a freestanding maternity clinic. ultrasonic ultrasonic /ul·tra·son·ic/ (-son´ik) beyond the upper limit of perception by the human ear; relating to sound waves having a frequency of more than 20,000 Hz.
1. loop control system can be used to maintain a loop of product between the cutter feed conveyor and the upstream process.
This machine is designed to operate in 24 x 7 operations, such as custom rubber and masterbatch mixing lines, calender lines, sheet extrusion lines and other continuous processes. It is also accurate enough to produce cut preforms for compression molds and transfer press pot loads. It is a huge advance from the methods of cutting rubber sheet and slabs previously used.