Compression-cutting assembly and method
AssigneeJohns Manville
InventorsRobert J. Allwein, Blake B. Bogrett, Larry J. Weinstein
Life of this patent
Estimating the term…
Abstract
At least one longitudinally extending series of cuts and separable connectors is formed in a fibrous insulation blanket with one or more rotating compression-cutting blades and a cooperating anvil to form separable blanket sections in the insulation blanket. The size and configuration of the teeth and notches in the compression-cutting blade, which may be determined through the use of an empirical equation, insure that the insulation blanket has the integrity to be handled and installed as a unit, but can be separated by hand into the blanket sections. The anvil has a moving surface that drives the compression-cutting blade at the velocity blanket is being fed between the cutting blade and the anvil.
Claims1
A method of selecting lineal lengths for notches and teeth along a peripheral edge of a circular compression-cutting blade and forming notches and teeth along a peripheral edge of a circular compression-cutting blade whereby the circular compression-cutting blade, in use, forms a longitudinally extending series of cuts and separable connectors in a fibrous insulation blanket so that the fibrous insulation blanket can be handled and installed as a unit or separated by hand at the longitudinally extending series of cuts and separable connectors into blanket sections having widths less than a width of the fibrous insulation blanket, comprising:
- selecting a notch length NL for each of the notches in inches;
- selecting a tooth length for each of the teeth in inches;
- adding the notch length and tooth length to obtain a pitch length PL in inches;
- inserting the notch length NL and the pitch length PL in the following empirical equation for finding a tear index TI:
- TI=74.65−1330.4×NL−298.38×PL+15738×NL2+112.43×PL2−25080×NL3−12.903×PL3;
- solving for TI;
- and
- where the TI is between −70 and +70, using the selected notch length and tooth length as a notch length and a tooth length of the notches and teeth to be formed in a circular compression cutting blade for cuffing fibrous insulation blankets;
- and
- forming notches and teeth, having the notch length and the tooth length, in a circular compression-cutting blade for cutting fibrous insulation blankets.
Dependencies are inferred from the claim text.