Tampon applicator with improved insertion tip
An insertion end for a tampon applicator assembly. The insertion end has an insertion tip region and optionally an inflection region. The insertion end of the tampon applicator assembly is unique in one or more ways, including one or more of the following: having a unique degree of closure, an inflection region length that is different than an insertion end region length, petal slits that form a tear-drop shape, petals having multiple radii of curvature, the insertion end having a unique radius of curvature, the insertion end having a unique part thickness.
1 . A tampon applicator, comprising:
a barrel having a straight central longitudinal axis, comprising:
an insertion tip region having between three and eight petals, each of the petals having a free end coinciding with a forward most end of an inflection curvature, each of the petals separated from each other by one of a plurality of slits, the insertion tip region having a formed insertion tip region length defined from the free end of the petals to where the slits between the petals terminate, the insertion tip region defining an insertion tip region radius where the plurality of slits between the petals terminate;
an inflection region adjacent to the insertion tip region, the inflection region defining a formed inflection region length, the inflection region having an inflection region radius;
a main body region adjacent the inflection region, the main body region having a main body region radius, the main body region having a wall that is substantially straight; and
a grip region adjacent the main body region; and
a plunger that telescopically engages the barrel;
wherein each of the petals has a formed petal length of between about 0.40 inches and about 0.48 inches, wherein a total slit length between each of the petals is between about 0.50 inches and about 0.58 inches;
wherein the inflection region radius is located where the inflection region meets the main body region and the inflection region radius is less than the main body region radius;
wherein the petals have a wall thickness that is substantially uniform;
wherein the formed insertion tip region length is different than and separate from the formed inflection region length;
wherein an insertion taper ratio is the ratio between the formed insertion tip region length to the insertion tip region radius, where the insertion taper ratio is greater than 1;
wherein an inflection taper ratio is the ratio between (a) a sum of the formed insertion tip region length and the formed inflection region length, to (b) the greater of the insertion tip region radius and the inflection region radius, where the inflection taper ratio is greater than 1;
wherein the insertion tip region, the inflection region, the main body region and the grip region are coaxial about the straight central longitudinal axis.
2 . The tampon applicator according to claim 1 , wherein the inflection region is adjacent to and separate from the insertion tip region such that the sum of the insertion tip region length and the inflection region length is greater than the insertion tip region length.
3 . The tampon applicator according to claim 1 , wherein the inflection region length is less than the inflection region radius.
4 . The tampon applicator according to claim 1 , wherein the sum of the insertion tip region length and the inflection region length is at least about 10% of a barrel length of the barrel.
5 . The tampon applicator according to claim 4 , wherein the sum of the insertion tip region length and the inflection region length is at least about 20% of a barrel length of the barrel.
6 . The tampon applicator according to claim 1 , wherein the inflection region length increases an inflection region curvature beyond where the slits between the petals terminate.
7 . The tampon applicator according to claim 1 , wherein an angle α″ is defined by the insertion tip region length along and the central longitudinal axis to a point x where the slits between the petals terminate, and from the point x where the slits between the petals terminate to where the inflection region meets the main body region at a point z″, wherein angle α″ is obtuse.
8 . The tampon applicator according to claim 1 , wherein the inflection taper ratio is greater than 1.3.
9 . The tampon applicator according to claim 1 , wherein the petal wall thickness does not vary by more than about 10% across an area of each of the petals.
10 . The tampon applicator according to claim 9 , wherein the petal wall thickness does not vary by more than about 2% across the area of each of the petals.
11 . The tampon applicator according to claim 1 , wherein the insertion tip region and the inflection region form an insertion end, the insertion end including a radius of curvature generally defining an exterior geometry of the insertion end between the forward most end and a rearward most end where the inflection region meets the main body region, the radius of curvature exceeding about 0.400 inches.
12 . The tampon applicator according to claim 1 , wherein the termination of the slits form a tear-drop shape having a radius of curvature between about 0.028 inches and about 0.030 inches.