1. A water absorbing material containing a water-absorbent material consisting of at least one of plastic and fluff pulp that are obtained by separating a water-absorbent polymer from a sanitary article containing the plastic, the fluff pulp and the water-absorbent polymer,
wherein a weight ratio of the water-absorbent polymer adhering to the water-absorbent material with respect to the water-absorbent material is 3% or less.
2. The water absorbing material according to claim 1,
wherein the water-absorbent polymer is separated from the sanitary article with a separation device, and
the separation device includes:
a first shredding unit that shreds the sanitary article; and
a first rough separation unit that has a first tubular portion in which a large number of first holes that allow the fluff pulp and the water-absorbent polymer to pass through without allowing the plastic contained in the sanitary article shredded by the first shredding unit to pass through are formed, and that separates the fluff pulp and the water-absorbent polymer passing through the first holes from the sanitary article by rotating the first tubular portion in a state in which the sanitary article shredded by the first shredding unit is accommodated in the first tubular portion.
3. The water absorbing material according to claim 2,
wherein the separation device includes a first fine separation unit that separates the fluff pulp and the water-absorbent polymer, which are separated from the sanitary article by the first rough separation unit, from each other.
4. The water absorbing material according to claim 2,
wherein the separation device includes a first ridge that is provided on an inner circumferential surface of the first tubular portion and that extends in a direction in which a central axis of the first tubular portion extends.
5. The water absorbing material according to claim 4,
wherein \u201cp\u201d of said first ridges are present, \u201cp\u201d being an integer between 3 and 5 inclusive, and the \u201cp\u201d first ridges are arranged on the inner circumferential surface of the first tubular portion at regular intervals.
6. The water absorbing material according to claim 2,
wherein the separation device includes a first air pipe for transferring the sanitary article shredded by the first shredding unit to the first rough separation unit with air pressure, and
the first air pipe has a first portion that extends in a first direction and a second portion that is connected to the first portion on a downstream side of the first portion and that extends in a second direction substantially orthogonal to the first direction.
7. The water absorbing material according to claim 6,
wherein the separation device includes a first uneven surface that is present in a connecting portion between the first portion and the second portion of the first air pipe and with which the sanitary article transferred through the first portion collides.
8. The water absorbing material according to claim 6,
wherein the first air pipe has a third portion that is connected to the second portion on a downstream side of the second portion and that extends in a third direction substantially orthogonal to the second direction.
9. The water absorbing material according to claim 8,
wherein the separation device includes a second uneven surface that is present in a connecting portion between the second portion and the third portion of the first air pipe and with which the sanitary article transferred through the second portion collides.
10. The water absorbing material according to claim 2,
wherein the separation device includes:
a second shredding unit that shreds the sanitary article from which the fluff pulp and the water-absorbent polymer passing through the first holes are separated by the first rough separation unit; and
a second rough separation unit that has a second tubular portion in which a large number of second holes that allow the fluff pulp and the water-absorbent polymer to pass through without allowing the plastic contained in the sanitary article shredded by the second shredding unit to pass through are formed, and that separates the fluff pulp and the water-absorbent polymer passing through the second holes from the sanitary article by rotating the second tubular portion in a state in which the sanitary article shredded by the second shredding unit is accommodated in the second tubular portion.
11. The water absorbing material according to claim 10,
wherein the separation device includes a second fine separation unit that separates the fluff pulp and the water-absorbent polymer, which are separated from the sanitary article by the second rough separation unit, from each other.
12. The water absorbing material according to claim 10,
wherein an area of each of the second holes in a plan view is smaller than an area of each of the first holes in a plan view.
13. The water absorbing material according to claim 1, comprising:
a granular core portion containing the water-absorbent material; and
a coating layer portion that covers the granular core portion.
14. The water absorbing material according to claim 13,
wherein the coating layer portion contains the fluff pulp and the water-absorbent polymer.
15. The water absorbing material according to claim 1,
wherein the water-absorbent material is a main material of the water absorbing material.
16. A manufacturing method of a water absorbing material comprising:
an obtaining step of separating a water-absorbent polymer from a sanitary article containing plastic, fluff pulp and the water-absorbent polymer to obtain a water-absorbent material consisting of at least one of the plastic and the fluff pulp; and
a granulating step of granulating the water-absorbent material obtained in the obtaining step,
wherein in the obtaining step, the water-absorbent polymer is separated from the sanitary article so that a weight ratio of the water-absorbent polymer adhering to the water-absorbent material with respect to the water-absorbent material will be 3% or less.
17. The manufacturing method of the water absorbing material according to claim 16,
wherein the obtaining step includes:
a first shredding step of shredding the sanitary article; and
a first rough separating step of rotating a first tubular portion in which a large number of first holes that allow the fluff pulp and the water-absorbent polymer to pass through without allowing the plastic contained in the sanitary article shredded in the first shredding step to pass through are formed, the first tubular portion being rotated in a state in which the sanitary article shredded in the first shredding step is accommodated in the first tubular portion, thereby separating the fluff pulp and the water-absorbent polymer passing through the first holes from the sanitary article.
18. The manufacturing method of the water absorbing material according to claim 17,
wherein the obtaining step includes a first fine separating step of separating the fluff pulp and the water-absorbent polymer, which are separated from the sanitary article in the first rough separating step, from each other.
19. The manufacturing method of the water absorbing material according to claim 17,
wherein the obtaining step includes:
a second shredding step of shredding the sanitary article from which the fluff pulp and the water-absorbent polymer passing through the first holes are separated in the first rough separating step; and
a second rough separating step of rotating a second tubular portion in which a large number of second holes that allow the fluff pulp and the water-absorbent polymer to pass through without allowing the plastic contained in the sanitary article shredded in the second shredding step to pass through are formed, the second tubular portion being rotated in a state in which the sanitary article shredded in the second shredding step is accommodated in the second tubular portion, thereby separating the fluff pulp and the water-absorbent polymer passing through the second holes from the sanitary article.
20. The manufacturing method of the water absorbing material according to claim 19,
wherein the obtaining step includes a second fine separating step of separating the fluff pulp and the water-absorbent polymer, which are separated from the sanitary article in the second rough separating step, from each other.
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. A flat, planar dust cover having free outer edges and formed of a flexible material, said dust cover having a friction locking mechanism for securing the dust cover to an open-topped container, said friction locking mechanism comprising at least one cut-out slot formed adjacent a free outer edge of the dust cover, said cut-out slot having a front edge defined by a narrow strip of said flexible material between said slot and said adjacent free outer edge of said dust cover, a back edge, and two side edges, at least one bendable flap in the slot, having a front edge spaced from but adjacent to the front edge of the slot, a back pivot line coinciding with the back edge of the slot, and two side incision lines coinciding with the side edges of the slot, wherein said flap can pivot along said back pivot line in an upwards direction, and a strip of reinforcing tape extends through said narrow strip to increase tear resistance of said dust cover, said strip of reinforcing tape having a width to extend from said adjacent free outer edge to an inner location spaced beyond said front edge of the slot and extending over at least a front edge portion of said flap.
2. The dust cover as claimed in claim 1, wherein said back pivot line comprises a perforated line across said flexible material.
3. The dust cover as claimed in claim 1, wherein said reinforcing tape is embedded in said flexible material such that said reinforcing tape extends through said narrow strip.
4. The dust cover as claimed in claim 1, wherein said reinforcing tape is embedded in said flexible material such that said reinforcing tape surrounds said cut-out slot along said front edge and two side edges of the slot.
5. The dust cover as claimed in claim 1, wherein the front edge of said flap is arcuate.
6. The dust cover as claimed in claim 1, wherein said dust cover has four of said locking mechanisms.
7. The dust cover as claimed in claim 1, wherein:
a said cut-out slot is formed through said dust cover adjacent each of two opposed edges, each slot leaving a narrow strip of material between it and the adjacent free outer edge, and a strip of reinforcing tape extends along each of said edges to reinforce the narrow strips of material.
8. The dust cover as claimed in claim 7, wherein:
the strips of reinforcing tape each has a width at least as great as the width of each said narrow strip of material.
9. The dust cover as claimed in claim 8, wherein:
said strip of reinforcing tape has a width to extend across said dust cover from said free outer edge almost to said back edge of said slots.