Filtration Article Containing A Filtration Material Having Twisted Pleats Therein

A filter cartridge assembly comprising:

• a cylindrical filtration material having pleats, said cylindrical filtration material defining an outer periphery, an inner periphery, a first end surface, and a second end surface;
• and
• an end cap bonded to each said first and second end surface of said cylindrical element,
• wherein said pleats have an angle of rotation (θ) greater than about 5 degrees as calculated utilizing the following formula:
• θ
• =
• 114.6
• 
• L
• m
• 2
• -
• L
• c
• 2
• d
• 2
• where Lm is length of said filtration material,
• where Lc is length of filter cartridge, and
• where d is diameter of said filtration material.

A method of forming a twisted, pleated filtration material comprising:

• twisting a first end of filtration material relative to a second end of said filtration material, said filtration material comprising a plurality of pleats;
• and
• calculating a twist angle formed between a first position of a designated pleat and a second position of said designated pleat utilizing the following formula:
• θ
• =
• 114.6
• 
• L
• m
• 2
• -
• L
• c
• 2
• d
• 2
• where Lm is length of filtration material,
• where Lc is length of filter cartridge, and
• where d is diameter of filtration material,

A method of forming a twisted filtration material comprising:

• obtaining a cylindrical filter element including:
• a first end surface;
• a second end surface opposing said first end surface;
• and
• outwardly projecting pleats, each said pleat having a first position on said first end surface and a second position on said second end surface, said first and second positions being substantially in alignment with a longitudinal axis of said filtration material;
• and
• rotating said second end surface relative to said first end surface about said vertical axis,
• wherein after said rotation, said first position is not in alignment with said second position along said longitudinal axis of said filtration material.