1. An internal gear machining method which performs internal gear machining on a to-be-machined internal gear by synchronously rotating the to-be-machined internal gear and a barrel-shaped threaded tool in mesh with each other, the to-be-machined internal gear being rotatable about a workpiece rotation axis, the barrel-shaped threaded tool being rotatable about a tool rotation axis having a predetermined crossed axes angle to the workpiece rotation axis, the internal gear machining method characterized in that
the crossed axes angle is set based on the threaded tool form.
2. The internal gear machining method according to claim 1, characterized in that
the threaded tool has such a form that an amount of change in a tool radius and the crossed axes angle satisfy a relationship that the crossed axes angle increases as the amount of change in a tool radius increases,
where the amount of change in a tool radius is found from a tool diameter of an axially intermediate portion of the threaded tool and tool diameters of axially opposite end portions thereof.
3. The internal gear machining method according to claim 1, characterized in that
the threaded tool is formed into a barrel shape having a tool diameter gradually decreasing from an axially intermediate portion of the threaded tool toward axially opposite end portions thereof.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An absorber containing non-wood pulp, wherein
the non-wood pulp is abaca pulp made from a portion near the core of Manila hemp or a portion between the core and hull of Manila hemp, or banana pulp made from banana stem,
the mean fiber size of the non-wood pulp is 8 to 25 \u03bcm,
the apparent bulk density of the non-wood pulp is 0.04 to 0.07 gcm3,
the absorption of the non-wood pulp for 0.9% physiological saline is at least 20 times the mass of the pulp, and
the settling velocity of the non-wood pulp in water is between 2 seconds and 5 seconds.
2. The absorber according to claim 1, which further comprises SAP.
3. An absorbent article comprising the absorber according to claim 1.
4. An absorbent article comprising the absorber according to claim 2.
5. The absorbent article according to claim 4, wherein the absorber contains the non-wood pulp at a basis weight of from 200 to 250 gm2.
6. The absorbent article according to claim 4, wherein the absorber has a thickness change of at least 600%, as the thickness after having absorbed 0.9% physiological saline with respect to the thickness before absorbing 0.9% physiological saline.
7. The absorbent article according to claim 4, wherein when addition of 80 mL of 0.9% physiological saline to the absorbent article over a period of 10 seconds is performed three times every 10 minutes and the absorption rate of the absorbent article for each of the three times is evaluated as the time from addition of the 0.9% physiological saline until complete absorption, the absorption rate for each of the three times is not greater than 20 seconds.