WO2009142188A1

WO2009142188A1 - Disc holder

Info

Publication number: WO2009142188A1
Application number: PCT/JP2009/059165
Authority: WO
Inventors: 松下敬通; 野崎友清
Original assignee: 株式会社環境経営総合研究所
Priority date: 2008-05-20
Filing date: 2009-05-19
Publication date: 2009-11-26
Also published as: JP5159879B2; JPWO2009142188A1

Abstract

Provided is a disc holder having excellent durability and water resistance and withstanding repeated use. A disc holder (10A) consists of a mixture produced by kneading, while heating, polypropylene and paper powder having an average grain diameter of 30-150 μm. In the disc holder (10A), a disc containing region (20) is formed in an upper wall (11), and a fitting section (37) is formed in the center of the disc containing region (20). To the upper wall (11), there are connected first and second ribs and third and fourth ribs. The first and second ribs extend downward from first and second side edges, and the third and fourth ribs extend downward from third and fourth side edges. In the fitting portion (37) are defined elastically deformable first to third movable portions and fixed portions extending between the movable portions. The movable portions are arranged at equal intervals in the circumferential direction of the fitting section (37) and protrude toward the center of the fitting portion (37).

Description

Disc holder

The present invention relates to a disc holder that detachably holds a disc.

A CD package having a lower paperboard having a square shape in plan and an upper paperboard that is the same size and size as the lower paperboard and covers the lower paperboard, with a long rectangular stopper inserted in a notch formed in the center of the lower paperboard Yes (see Patent Document 1). The stopper is provided with five fold lines and is folded into two via the center fold line. Both ends of the stopper are bonded to the back surface of the lower paperboard. In this CD package, after inserting the central hole of the compact disc into the stopper, the stopper is pushed down toward the notch. When the stopper is pushed down, the stopper is folded through the fold lines formed on both sides of the center fold line, the stopper spreads left and right, and the compact disc is held by the stopper. Further, the folded state of the stopper is maintained by folding the upper paperboard and superposing the upper paperboard and the lower paperboard.

Japanese Patent Laid-Open No. 10-245089

Since the CD package disclosed in Patent Document 1 is made of a lower paperboard and an upper paperboard, it has poor durability and water resistance and cannot withstand repeated use. Even if the compact disc is held by the folded long and narrow stopper, the folding of the stopper is easily released, so that the central hole of the compact disc may be inadvertently detached from the stopper.

As a case for storing the compact disc, a plastic disc having a fitting portion for detachably fitting the central hole of the compact disc is widely used. A plurality of radially extending notches are formed in the fitting portion, and the disc can be fixed to the case by pushing the central hole of the compact disc into the fitting portion. Such a case can be used repeatedly, but since it is made of plastic, a large amount of CO ₂ is emitted during the incineration process, causing global warming. Furthermore, the case cannot be completely burned unless the calories burned is high and the incineration temperature is high.

An object of the present invention is to provide a disc holder that has excellent durability and water resistance and can withstand repeated use. Another object of the present invention is to provide a disc holder that can solve the above-mentioned problems of a case made of plastic.

The premise of the present invention to solve the above-mentioned problems is that a disk holder is formed in which a disk storage area that is recessed downward from the upper wall is formed on the upper wall of the rectangular shape, and the disk is removably held in the disk storage area It is.

The feature of the present invention based on the above premise is that the disc holder is made of a mixture obtained by kneading a polyolefin-based thermoplastic synthetic resin and plant fiber powder having an average particle size of 30 to 150 μm under heating, The weight ratio of the thermoplastic synthetic resin to the weight is in the range of 35 wt% or more and less than 50 wt%, and the weight ratio of the vegetable fiber powder to the total weight of the disc holder is in the range of 50 wt% or more and 65 wt% or less. There is.

As an example of the present invention, polypropylene is used for the thermoplastic synthetic resin, paper powder is used for the vegetable fiber powder, and the flexural modulus is 1800 MPa or more and 2000 MPa or less and the melt flow rate (MFR) is used for the polypropylene. A grade of 50 g / 10 min to 60 g / 10 min at 230 ° C., 2,16 kg, 1φ orifice is used.

As another example of the present invention, at the center of the disk storage area, a fitting portion is formed that protrudes upward from the disk storage area and removably fits the center hole of the disk. The first and second ribs extending downward from one opposite side edge of the upper wall and the third and fourth ribs extending downward from the other opposite side edge of the upper wall are connected to each other, and the fitting portion has a direction around it. Elastically deformable first to third movable parts that are arranged at regular intervals and project toward the center of the fitting portion, and a fixed part that extends between the movable parts are defined, The movable part is divided into a first movable part and a first movable part that can be elastically deformed by being divided into two around the fitting part, and a second movable part is divided into two around the fitting part. It is divided into the 2-1 movable part and the 2-2 movable part that can be elastically deformed, and the third movable part is fitted. It is divided into halves around the direction of which is divided into 3-1 movable portion elastically deformable and the 3-2 movable portion.

As another example of the present invention, the first movable portion is partitioned from the fixed portion by the first notch that protrudes from the disk storage area extending in the vicinity of the fitting portion toward the center of the fitting portion, and is fitted. The disc housing is divided into a first movable portion 1-1 and a first movable portion 1-2 by a second notch reaching the first notch from the disc housing area extending in the vicinity of the portion, and the second movable portion extends in the vicinity of the fitting portion. The second notch is movable by the fourth notch that is partitioned from the fixed part by the third notch that protrudes from the area toward the center of the fitting part, and that reaches the third notch from the disk storage area that extends in the vicinity of the fitting part. The third movable part is divided from the fixed part by a fifth notch that protrudes from the disk storage area extending in the vicinity of the fitting part toward the center of the fitting part; and In the vicinity of the mating part The sixth notch from the disk storage area extending to reach the fifth notch are divided between 3-1 movable portion and the 3-2 movable portion.

As another example of the present invention, the fixed part extends between the first movable part and the second movable part, and the second fixed part extends between the second movable part and the third movable part. And a third fixed part extending between the third movable part and the first movable part, and these fixed parts are connected to each other at the center of the fitting portion.

As another example of the present invention, the disc holder is connected to the first connecting portion that connects the first rib and the peripheral portion of the disc storage area, and the second connection that connects the second rib and the peripheral portion of the disc storing region. In the first and second connecting portions, a gap having a predetermined length is formed between the first and second ribs and the peripheral edge portion of the disk storage area.

As another example of the present invention, the disc holder is connected to the third connection portion connecting the third rib and the peripheral portion of the disc storage area, and the fourth connection connecting the fourth rib and the peripheral portion of the disc storage region. In the third and fourth connecting portions, a gap having a predetermined length is formed between the third and fourth ribs and the peripheral portion of the disc storage area.

As another example of the present invention, in the disk storage area, the disk facing surface is subjected to a textured process.

As another example of the present invention, the disk storage area is formed of a flange portion that extends radially inward from the peripheral edge thereof to support the peripheral edge portion of the disk, and an opening hole that opens at the center thereof. Fitting means for detachably fitting the peripheral edge of the disk is formed in the vicinity of the peripheral edge of the region, and the upper wall has first and second ribs extending downward from one opposing side edge of the upper wall, Elasticity in which the third and fourth ribs extending downward from the other opposing side edge of the upper wall are connected, and the fitting means is inclined upwardly toward the upper wall while extending radially outward from the flange portion. A deformable first movable member, an elastically deformable second movable member extending radially outward from the flange portion, and a radially inward direction from the periphery of the disk storage area facing the first and second movable members A first movable part formed from a first convex part which becomes convex Has an engagement recess that is located in the vicinity of the periphery of the disk storage area and that is recessed radially inward, and the second movable member is positioned on both sides of the first movable member and extends radially outward from the flange portion. A pair of leg portions that incline in an upward gradient toward the upper wall while being taken out, and a free portion that is connected to the distal ends of the leg portions and is positioned above the first movable member and radially outward to be able to turn in the thickness direction And the free portion has an engaging convex portion that is formed at a position facing the engaging concave portion of the first movable member and protrudes radially inward, and the peripheral portion of the disc is the first movable member. The disc is fixed in the disc storage area by being sandwiched between the engaging concave portion of the member and the engaging convex portion of the second movable member and positioned between the first convex portion and the flange portion. The

As another example of the present invention, the flange portion extending between the first and second movable members and the first convex portion protrudes radially inward from the peripheral portion of the disc storage area to the peripheral portion of the disc. The 2nd convex part which supports is formed.

According to the disk holder of the present invention, it is made from a mixture obtained by kneading a polyolefin-based thermoplastic synthetic resin and plant fiber powder under heating, and the weight ratio of the plant fiber powder to its total weight is 50% by weight or more. In addition, since it is in the range of 65% by weight or less, it has a higher flexural modulus and strength than a disc holder made only from a thermoplastic synthetic resin. Can withstand the use of In addition, compared with the case where the disc holder is made only from the thermoplastic synthetic resin, the amount of CO ₂ emission generated during the incineration process can be extremely reduced, and the disk holder is made only from the thermoplastic synthetic resin. Combustion calorie is low compared with a disc holder, and it can be burned completely at a low incineration temperature. Since the weight ratio of the thermoplastic synthetic resin to the total weight of the disk holder is in the range of 35% by weight or more and less than 50% by weight, the disk holder is excellent in water resistance and can sufficiently withstand moisture.

Polypropylene is used for the thermoplastic synthetic resin, paper powder is used for the plant fiber powder, and the polypropylene has a flexural modulus of 1800 MPa to 2000 MPa and a melt flow rate (MFR) (230 ° C., 2,16 kg, 1φ orifice). The disc holder in which a grade of 50 g / 10 min or more and 60 g / 10 min or less is used is made of a mixture of paper powder mixed with paper powder using the flexural modulus polypropylene. Bending elastic modulus and strength are high as compared with the disc holder made, it is not broken or broken, has excellent durability, and can sufficiently withstand repeated use. Since this disc holder uses polypropylene as the thermoplastic synthetic resin, no smoke is generated during the incineration process, and air pollution is not induced.

A fitting portion is formed in the center of the disk storage area, and the first and second ribs and the third and fourth ribs are connected to the upper wall, and the first to third movable portions that are elastically deformable to the fitting portion; Since the first to fourth ribs are formed on the upper wall of the disk holder in which the fixed part extending between the movable parts is defined, even if an external force is applied to the upper wall or the disk storage area, Irregular deformation in the upper wall and the disk storage area is prevented by these ribs, and the upper wall and the disk storage area are not cracked, and the upper wall and the disk storage area can be prevented from being damaged or broken. Even if an external force is applied to the disk holder, the upper wall, the disk storage area, and the first to fourth ribs are not broken or damaged, and are excellent in durability and can withstand repeated use. Since the disc holder is formed with first to third movable parts that can be elastically deformed in the fitting part, when the central hole of the disk is pushed into the fitting part, these movable parts move toward the center of the fitting part. The center hole of the disk can be pushed into the fitting portion, and the disk can be fixed in the disk storage area. Further, when the disc is pulled up above the fitting portion, the movable parts are bent toward the center of the fitting portion, and the fitting between the center hole of the disc and the fitting portion can be easily released. Since the movable part of the disk holder is divided into two parts, the movable part is easily elastically deformed, the movable part is easily bent, the bent movable part is easily restored, and the disk is securely attached to the fitting portion. In addition to being able to be fixed, the fitting between the disc and the fitting portion can be easily released, and the disc can be easily removed from the disc storage area.

These movable parts are separated from the fixed part by notches (notches), and the disc holder which is divided by notches (notches) is inserted into the fitting part when the center hole of the disk is pushed into the fitting part. It can be easily bent toward the center of the joint portion, the center hole of the disc can be pushed into the fitting portion, and the disc can be securely fixed to the disc storage area. Further, when the disk is pulled up above the fitting part, these movable parts are easily bent toward the center of the fitting part, and the fitting between the center hole of the disk and the fitting part can be easily released. In this disk holder, since the movable parts are divided into two by notches, the movable parts are easily elastically deformed, the movable parts are easily bent, the bent movable parts are easily restored, and the disk is used as a fitting portion. While being able to fix reliably, the fitting with a disk and a fitting part can be cancelled | released easily, and a disk can be easily removed from a disk storage area.

The disk holder in which the fixing part is formed of the first to third fixing parts and the fixing parts are connected to each other at the center of the fitting portion has high rigidity of the fixing part, and the fixing part does not deform irregularly. Therefore, even if an external force is applied to these fixing parts, the fixing parts can be prevented from being broken or damaged. In this disc holder, the fixing portion is not broken or broken, and the center hole of the disc is reliably supported in the fitting portion including the fixing portion, so that the disc can be fixed to the fitting portion reliably. Thus, it is possible to reliably prevent the disk from being removed from the fitting portion.

First and second connecting portions for connecting the first and second ribs and the peripheral portion of the disc storage area are formed, and a predetermined distance is formed between the first and second ribs and the peripheral portion of the disc storage region in the connecting portion. In the disc holder in which the gap of the length is formed, the first and second ribs and the peripheral portion of the disc storage area are reinforced by forming the first and second connecting portions, and the first and second ribs and discs are reinforced. Breakage or breakage of the peripheral edge of the storage area can be prevented. If a gap of a predetermined length is not formed in the first and second connecting portions, irregular bending stress acts on the upper wall and the disc storage area around the connecting portions when the disk holder is formed, Irregular bending may occur in the upper wall of the molded disc holder or the disc storage area. However, since this disc holder has gaps of a predetermined length in the first and second connecting portions, the bending stress acting around these connecting portions when the disk holder is formed is dispersed by the gaps. Therefore, irregular bending does not occur in the upper wall of the molded disc holder and the disc storage area.

Third and fourth connecting portions for connecting the third and fourth ribs and the peripheral portion of the disc storage area are formed, and a predetermined distance is provided between the third and fourth ribs and the peripheral portion of the disc storage area in the connecting portion. In the disc holder in which the gap of the length is formed, the third and fourth ribs and the peripheral portion of the disc storage area are reinforced by forming the third and fourth connecting portions, and the third and fourth ribs and discs are reinforced. Breakage or breakage of the peripheral edge of the storage area can be prevented. In addition, when the predetermined length of the gap is not formed in the third and fourth connecting portions, irregular bending stress acts on the upper wall and the disc storage area around the connecting portions at the time of forming the disc holder, Irregular bending may occur in the upper wall of the molded disc holder or the disc storage area. However, since this disc holder has gaps of a predetermined length in the third and fourth connecting portions, the bending stress acting around these connecting portions is dispersed by the gaps when the disc holder is formed. Therefore, irregular bending does not occur in the upper wall of the molded disc holder and the disc storage area.

Disc holders that have a textured surface facing the disc in the disc storage area may form streaks or strips in the disc storage area when the disc holder is molded. It is possible to improve the edge of the disc holder by applying a texture to the disc facing surface.

Fitting means is formed in the vicinity of the periphery of the disc storage area, and the first and second movable members are connected to the upper wall with the first and second ribs and the third and fourth ribs, and the fitting means can be elastically deformed. And the first convex portion projecting radially inward from the periphery of the disc storage area, the first to fourth ribs are formed on the upper wall of the disc holder. Even if an external force is applied, irregular deformation in the upper wall and flange part is prevented by these ribs, cracks etc. do not occur in the upper wall and flange part, and damage and breakage of the upper wall and flange part are prevented. be able to. Even if an external force is applied to the disc holder, the upper wall, the flange portion, and the first to fourth ribs are not broken or damaged, and are excellent in durability and can withstand repeated use. Since the disc holder is formed of first and second movable members and first convex portions whose fitting means can be elastically deformed, when the disc is pushed into the disc storage area, the first movable member is lowered from the upper wall. And the peripheral edge of the disc can be pushed between the engaging concave portion of the first movable member and the engaging convex portion of the second movable member, and the disc can be fixed in the disc storage area. . Further, when the second movable member is swung downward from the upper wall, the peripheral edge of the disc comes off between the engaging concave portion of the first movable member and the engaging convex portion of the second movable member, and the peripheral edge of the disc The fitting between the part and the fitting means can be easily released, and the disk can be easily removed from the disk storage area. Since the disc holder has an opening hole in the center of the disc storage area, the material can be saved correspondingly, and the disc holder can be made inexpensively.

A flange that extends between the first and second movable members and the first protrusion is formed with a second protrusion that protrudes radially inward from the periphery of the disk storage area and supports the periphery of the disk. In the disc holder, when the disc is stored in the disc storage area, the peripheral edge of the disc comes into contact with the second convex portion, so that the downward movement of the disc in the disc storage region is prevented by the second convex portion. When the disk moves downward in the disk storage area, the peripheral edge of the disk may be inadvertently detached from the fitting means, but this disk holder is moved downward by the second protrusion in the disk storage area. Since the movement is prevented, the engagement between the peripheral edge of the disk and the fitting means is not inadvertently released, and the disk can be securely fixed to the disk storage area.

The perspective view of the disc holder shown as an example. The front view of the disc holder of FIG. The rear view of the disc holder of FIG. FIG. 3 is a cross-sectional view taken along line 2-2 in FIG. 2. The elements on larger scale of a fitting part. The perspective view of the disc holder shown in the state which inserted the disc. The perspective view of the disc holder shown as another example. The rear view of the disc holder of FIG. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 8. The perspective view of the disc holder shown as another example. The front view of the disc holder of FIG. FIG. 11 is a rear view of the disc holder of FIG. 10. FIG. 13 is a cross-sectional view taken along line 13-13 in FIG. The elements on larger scale of a fitting means. The elements on larger scale of a fitting means. The perspective view of the disc holder shown in the state which inserted the disc.

FIG. 1 is a perspective view of a disc holder 10A shown as an example, FIG. 2 is a front view of the disc holder 10A, FIG. 3 is a rear view of the disc holder 10A, and is a cross-sectional view taken along line 2-2 in FIG. 4. The details of the disk holder according to the present invention will be described below with reference to the accompanying drawings such as FIG. 1 to 3, the vertical direction is indicated by an arrow A, the horizontal direction is indicated by an arrow B, and the thickness direction is indicated by an arrow C (only in FIG. 1). The disc holder 10A has a predetermined area and has a planar shape of a rectangular upper wall 11, first and

second ribs

12 and 13 facing each other and parallel to the longitudinal direction, and facing each other laterally. Parallel third and

fourth ribs

14 and 15 are provided.

The upper wall 11 has first and second side edges 16 and 17 (opposing side edges) extending in the vertical direction and third and fourth side edges 18 and 19 (opposing side edges) extending in the horizontal direction. In the center of the upper wall 11, a disk storage area 20 is formed that is recessed downward in the thickness direction. A semicircular first recess 22 that is recessed downward in the thickness direction is formed at the first corner 21 that is the intersection of the first side edge 16 and the third side edge 18 of the upper wall 11. A semicircular second recess 24 that is recessed downward in the thickness direction is formed at the second corner 23 that is the intersection of the third side edge 18 and the second side edge 17. A semicircular third recess 26 that is recessed downward in the thickness direction is formed at the third corner 25 that is the intersection of the second side edge 17 and the fourth side edge 19 of the upper wall 11. A semicircular fourth concave portion 28 that is recessed downward in the thickness direction is formed at the fourth corner portion 27, which is an intersection of the fourth side edge 19 and the first side edge 16. These

recesses

22, 24, 26 and 28 are connected to the disk storage area 20.

The first rib 12 is connected to the first side edge 16 of the upper wall 11 and extends downward from the side edge 16 in the thickness direction. The second rib 13 is connected to the second side edge 17 of the upper wall 11 and extends downward from the side edge 17 in the thickness direction. The third rib 14 is connected to the third side edge 18 of the upper wall 11 and extends downward from the side edge 18 in the thickness direction. The fourth rib 19 is connected to the fourth side edge 19 of the upper wall 11 and extends downward from the side edge 19 in the thickness direction. The first rib 12 and the third rib 14 are connected to the end edges 29 and 30 of the

ribs

12 and 14, and the third rib 14 and the second rib 13 are connected to the end edges 31 and 30 of the

ribs

13 and 14. 32 are connected. The second rib 13 and the fourth rib 15 are connected to the end edges 33 and 34 of the

ribs

13 and 15, and the fourth rib 15 and the first rib 12 are the end edges 35 and 35 of the

ribs

12 and 15. 36 are linked together.

The disk storage area 20 is a recess formed in a circular shape, and has a size and depth that can store a disk (disk) such as a CD-ROM, DVD-RAM, DVD-R, DVD-RW, or Blu-ray disk. . A circular fitting portion 37 that protrudes (projects) upward in the thickness direction from the storage area 20 is formed at the center of the disk storage area 20. In the vicinity of the fitting portion 37, a circular disc placement portion 38 is formed that slightly protrudes (projects) upward in the thickness direction from the disc storage area 20. The mounting portion 38 has a projecting dimension smaller than that of the fitting portion 37 and is formed concentrically with the storage area 20. On the peripheral edge 39 of the disk storage area 20, a ridge 40 extending concentrically with the storage area 20 is formed. The disk facing surface 41 of the disk storage area 20 excluding the fitting portion 37 and the disk mounting portion 38 and the disk facing surface 42 of the first to

fourth recesses

22, 24, 26, 28 are subjected to texture processing (irregular fineness). (Unevenness) is given (see FIG. 5).

As shown in FIG. 5, the fitting portion 37 is formed of a peripheral wall 43 extending upward in the thickness direction from the disk storage area 20 and a circular top wall 45 connected to the upper peripheral edge 44 of the peripheral wall 43. The fitting portion 37 has first to third

movable parts

46, 47, 48 of the same shape and the same size that can be elastically deformed and draw an arc toward the center thereof. First to

third fixing portions

49, 50, 51 of the same shape and the same size extending between 48 are defined. In the fitting portion 37, the first to third

movable portions

46, 47, 48 and the first to third

fixed portions

49, 50, 51 are alternately arranged so as to divide it into six equal parts in the circumferential direction. . In the fitting part 37, the first to third

movable parts

46, 47, 48 are arranged at equal intervals around the fitting part 37, and the first to

third fixing parts

49, 50, 51 are fitted. They are lined up at equal intervals around the portion 37. The area of the top wall 45 of the fitting portion 37 is slightly larger than that of the central hole 85 (see FIG. 6) of the disk 84.

The first movable part 46 has a first notch 52 (cut) that forms an arc from the disk storage area 20 (disk mounting part 38) extending in the vicinity of the fitting part 37 toward the center of the fitting part 37. The first fixing portion 49 and the third fixing portion 51 are partitioned by a notch. The first movable portion 46 is elastically deformable by a straight second notch 53 (notch) that reaches the first notch 52 from the disk storage area 20 (disk mounting portion 38) extending in the vicinity of the fitting portion 37. The first and second

movable parts

54 and 55 having the same shape are divided into two equal parts. The 1-1 movable portion 54 and the 1-2 movable portion 55 are formed on the first horizontal portion 56 formed in the storage area 20 (disk mounting portion 38) and extending horizontally, and on the peripheral wall 43 of the fitting portion 37. The vertical portion 57 is formed and extends vertically, and the second horizontal portion 58 is formed on the top wall 45 of the fitting portion 37 and extends horizontally.

The second movable portion 47 has a third notch 59 (cut) that forms an arc (convex) from the disc storage area 20 (disc placement portion 38) extending in the vicinity of the fitting portion 37 toward the center of the fitting portion 37. The first fixed portion 49 and the second fixed portion 50 are partitioned by a notch. The second movable portion 47 is elastically deformable by a straight fourth notch 60 (notch) that reaches the third notch 59 from the disc storage area 20 (disc mounting portion 38) extending in the vicinity of the fitting portion 37. The 2-1 movable part 61 and the 2-2 movable part 62 having the same shape are divided into two equal parts. The 2-1 movable portion 61 and the 2-2 movable portion 62 are formed on the first horizontal portion 63 formed in the storage area 20 (disk mounting portion 38) and extending horizontally, and on the peripheral wall 43 of the fitting portion 37. The vertical portion 64 that is formed and extends vertically and the second horizontal portion 65 that is formed on the top wall 45 of the fitting portion 37 and extends horizontally are formed.

The third movable portion 48 has a fifth notch 66 (cut) that forms an arc (projects) from the disc storage area 20 (disc placement portion 38) extending in the vicinity of the fitting portion 37 toward the center of the fitting portion 37. The second fixing portion 50 and the third fixing portion 51 are partitioned by a notch. The third movable part 48 is elastically deformable by a straight sixth notch 67 (notch) that reaches the fifth notch 66 from the disk storage area 20 (disk mounting part 38) extending in the vicinity of the fitting part 37. Divided into a 3-1 movable part 68 and a 3-2 movable part 69 of the same size. The 3-1 movable portion 68 and the 3-2 movable portion 69 are formed on the first horizontal portion 70 formed in the storage area 20 (disk mounting portion 38) and extending horizontally, and on the peripheral wall 43 of the fitting portion 37. The vertical portion 71 is formed and extends vertically, and the second horizontal portion 72 is formed on the top wall 45 of the fitting portion 37 and extends horizontally.

The first fixed part 49 extends between the first movable part 46 and the second movable part 47. The first fixing portion 49 is formed on the peripheral wall 43 of the fitting portion 37 and extends vertically, and the first fixing portion 49 is formed on the top wall 45 of the fitting portion 37 and extends from the peripheral wall 43 of the fitting portion 37 toward the center. A horizontal portion 74 extending horizontally. The second fixed part 50 extends between the second movable part 47 and the third movable part 48. The second fixing portion 50 is formed on the peripheral wall 43 of the fitting portion 37 and extends vertically, and is formed on the top wall 45 of the fitting portion 37 from the peripheral wall 43 of the fitting portion 37 toward the center. A horizontal portion 76 extending horizontally. The third fixed part 51 extends between the third movable part 48 and the first movable part 46. The third fixing portion 51 is formed on the peripheral wall 43 of the fitting portion 37 and extends vertically, and is formed on the top wall 45 of the fitting portion 37 so as to extend from the peripheral wall 43 of the fitting portion 37 toward the center. And a horizontal portion 78 extending horizontally. These

horizontal portions

74, 76, 78 of the first to

third fixing portions

49, 50, 51 are connected to each other at the center of the fitting portion 37.

As shown in FIG. 3, the first rib 12 and the peripheral edge 39 of the disk storage area 20 are connected to the center of the first side edge 16 of the upper wall 11 (the first rib 12 and the peripheral edge 39 are connected to each other). ) A first connecting portion 79 is formed. In the first connecting portion 79, a gap 80 (meat stealing) having a predetermined length extending in the vertical direction is formed between the first rib 12 and the peripheral edge 39 of the disc storage area 20. The gap 80 extends upward in the thickness direction from the non-disk facing surface 81 of the upper wall 11 and reaches the center in the thickness direction of the first rib 12. At the center of the second side edge 17 of the upper wall 11, there is a second connecting portion 82 that connects the second rib 13 and the peripheral portion 39 of the disk storage area 20 (connects the second rib 13 and the peripheral portion 39). Is formed. In the second connecting portion 82, a gap 83 (meat stealing) having a predetermined length extending in the vertical direction is formed between the second rib 13 and the peripheral portion 39 of the disc storage area 20. The gap 83 extends upward in the direction from the disk non-facing surface 81 of the upper wall 11 and reaches the center of the second rib 13 in the thickness direction.

The upper wall 11 and the disc storage area 20 have a thickness dimension L1 in the range of 1.3 to 1.4 mm. The first to

fourth ribs

12, 13, 14, 15 have a thickness dimension L2 in the range of 1.3 to 1.4 mm. If the thickness dimensions L1, L2 of the upper wall 11, the disc accommodating area 20, and the first to

fourth ribs

12, 13, 14, 15 are less than 1.3 mm, their strength is reduced, and the upper wall 11 and the disc accommodating area 20 are reduced. When an external force is applied to the first to

fourth ribs

12, 13, 14, and 15, they may be inadvertently damaged or broken. Since the disk holder 10A has the upper wall 11 and the disk storage area 20, and the thickness dimensions L1 and L2 of the first to

fourth ribs

12, 13, 14, and 15 within the above ranges, the upper wall 11 and the disk storage area 20, Even if an external force is applied to the first to

fourth ribs

12, 13, 14, 15, they are not damaged or broken.

The disc holder 10A is made of a mixture of polypropylene (polyolefin thermoplastic synthetic resin) and plant fiber powder. In the disc holder 10A, the vegetable fiber powder is dispersed substantially uniformly in the polypropylene. As the polypropylene, any one of block polymerized polypropylene, random polypropylene, homopolymerized polypropylene, metallocene-catalyzed polypropylene, and modified polypropylene, or polypropylene obtained by mixing them in a predetermined ratio can be used. As the polypropylene, a modified polypropylene obtained by reacting linear polypropylene, isoprene and a radical polymerization initiator can also be used. As the linear polypropylene, at least one of a polypropylene homopolymer, a coaggregate, a block copolymer, and a random copolymer can be used. As the radical polymerization initiator, a peroxide or an azo compound can be used.

In addition to polypropylene, polyethylene (polyolefin-based thermoplastic synthetic resin) can also be used. Polyethylene includes any one of low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, metallocene-catalyzed polyethylene, modified polyethylene, and ethylene vinyl acetate (EVA), or a predetermined ratio thereof. Mixed polyethylene can be used.

Plant fiber powder can be made by finely pulverizing paper using a fine pulverizer such as a ball mill, a medium stirring mill, or a roller mill (paper powder). In addition, the vegetable fiber powder can be made by finely pulverizing broken paper and broken paper generated when paper is produced (paper powder), and can also be made by finely pulverizing pulp. Furthermore, food paper tableware such as used paper cups, food paper trays, and milk cartons can be pulverized (paper powder). As the pulp, any one of mechanical pulp, chemical mechanical pulp, semi-chemical pulp, chemical pulp, or pulp obtained by mixing them in a predetermined ratio can be used. As the pulp, wood pulp is preferably used, but pulp obtained by mixing wood pulp with at least one of rag pulp, stalk cane pulp, and bast pulp can also be used. The plant fiber powder has an average particle size in the range of 30 to 150 μm. Paper, pulp, and food paper tableware that does not contain fluorescent materials, heavy metals, and ink components are used. Therefore, the fluorescent material, heavy metal, and ink component are not included in the disc holder 10A including the same. In addition, as the plant fiber powder, it is possible to use finely pulverized waste paper. As the used paper, used newspapers, used magazines, used printing paper, used packaging paper, cardboard used paper, OA used paper, and the like can be used.

The disc holder 10A can be manufactured by using an injection molding technique. An example of manufacturing the disc holder 10A will be described as follows. The manufacture of the disc holder 10A is formed by a pellet forming step for producing a pellet-shaped molding material (not shown) and a holder molding step for molding the pellet-shaped molding material into the disc holder 10A. In manufacturing the disc holder 10A, polypropylene is used as the thermoplastic synthetic resin, and paper powder is used as the vegetable fiber powder.

In the pellet molding step, a pellet-shaped molding material is manufactured using an extruder, a pellet molding die, and a cutter (not shown). In the pellet forming step, polypropylene and paper powder are prepared. In the pellet forming process, polypropylene and paper powder are put into the hopper of the extruder. Inside the extruder, polypropylene and paper powder are heated by a heater and are kneaded by a screw. Polypropylene is heated to a temperature higher than the melting temperature, and becomes a high-temperature molten polypropylene. The paper powder is kneaded together with polypropylene by an extruder screw, so that the paper powder is dispersed and mixed almost uniformly in the molten polypropylene. Polypropylene and paper powder become a hot molten mixture inside the extruder.

The molten mixture gradually moves from the rear end portion of the extruder toward the front end portion by the rotation of the screw. A pellet molding die that molds the molten mixture into a noodle shape and a cutter that cuts the molten mixture molded into a noodle shape into a predetermined length are attached to the tip of the extruder. The molten mixture extruded from the tip of the extruder is formed into a plurality of noodles through a mold, and immediately after the mixture formed into a noodle is discharged from the mold, it is cut into a predetermined length by a cutter. , Molded into a pellet-shaped molding material. The pellet-shaped molding material is cooled and solidified to maintain its form. In the pellet-shaped molding material, paper powder is dispersed substantially uniformly in polypropylene. In addition, pellet-shaped molding materials are molded by storing them in a plastic bag and storing them in a storage place with a dehumidifying function so that the paper powder contained in them does not contain moisture. The moisture absorption amount of the material is controlled to 5% or less.

In the holder molding step, the disc holder 10A is manufactured using an injection molding machine and a holder molding die (not shown). In the holder molding process, the pellet-shaped molding material produced by the pellet molding process is taken out from the storage location, and the pellet-shaped molding material is put into a hopper of an injection molding machine. Inside the injection molding machine, while the pellet-shaped molding material is kneaded by the screw, the molding material is heated by the heater, and the polypropylene in the molding material is heated to the melting temperature or higher to be melted to become a high-temperature molten mixture. The molten mixture gradually moves from the rear end portion to the front end portion of the injection molding machine by the rotation of the screw. A holder molding die for molding the molten mixture into the illustrated disk holder 10A is attached to the gate formed at the tip of the injection molding machine.

The holder mold is formed of a first mold and a second mold that overlap each other (not shown). In the first and second molds, a communication path through which the molten mixture passes and a holder forming groove formed in the shape of the disk holder 10A are formed. When pouring the molten mixture into the mold, the molds are overlapped so that the opposing surfaces of the first and second molds are in contact with each other. The molten mixture injected from the injection molding machine flows into the mold through the inlet of the holder molding die from the gate of the injection molding machine, and flows into the holder molding groove through the communication path. In the holder molding die, the illustrated disk holder 10A is produced by cooling and solidifying the molten mixture flowing into the holder molding groove in the groove. The holder molding die is formed with a plurality of disc holder 10A molds (holder molding grooves), and a plurality of disc holders 10A can be formed at a time. In order to take out the molded disc holder 10A from the holder molding die, the first die and the second die are separated from each other, and the molded disc holder 10A is taken out from the holder molding groove.

The molding conditions in the pellet molding process and the holder molding process are such that the molding temperature in the extruder or injection molding machine is 160 ° C. or higher and 185 ° C. or lower, and the temperature of the pellet molding die or holder molding die is 50 ° C. or higher and 90 ° C. It is as follows. If the molding temperature exceeds 185 ° C. and the mold temperature exceeds 90 ° C., the paper powder may be carbonized to reduce the strength of the disc holder 10A, and the disc holder 10A may be discolored (yellowed). In this manufacturing method, since the molding temperature in the extruder or the injection molding machine and the temperature of the pellet molding die or the holder molding die are within the above range, carbonization of the paper powder is prevented in the pellet molding step and the holder molding step. The strength of the disc holder 10A is not reduced by carbonizing the paper powder. Furthermore, discoloration (yellowing) of the paper powder can be prevented, and there is no discoloration of the disc holder 10A due to yellowing of the paper powder.

For polypropylene, grades having a flexural modulus of 1800 MPa to 2000 MPa and a melt flow rate (MFR) (230 ° C., 2,16 kg, 1φ orifice) of 50 g / 10 min to 60 g / 10 min are used. If the flexural modulus of polypropylene is less than 1800 MPa, the disk holder 10A having a high flexural modulus cannot be produced. The disk holder 10A made under the condition that the flexural modulus of polypropylene is 1800 MPa or less can easily form the upper wall 11, the disk storage area 20, and the first to

fourth ribs

12, 13, 14, 15 when an external force is applied. The upper wall 11, the disk storage area 20, and the first to

fourth ribs

12, 13, 14, 15 may be damaged or broken. This disk holder 10A uses polypropylene having the above conditions, so that the upper wall 11, the disk storage area 20, and the first to

fourth ribs

12, 13, 14, and 15 have high flexural modulus and strength, and the upper wall 11, the disc storage area 20, and the first to

fourth ribs

12, 13, 14, 15 are not broken or damaged, and are excellent in durability and water resistance, and can sufficiently withstand repeated use.

When the melt flow rate (MFR) of polypropylene is less than 50 g / 10 minutes, the fluidity of the molten mixture injected from the injection molding machine is remarkably lowered, and when the disc holder 10A is manufactured by the injection molding method, the molten mixture is injected. In some cases, the mold does not flow smoothly from the gate of the molding machine into the holder molding die, or the molten mixture easily causes short molding inside the holder molding die, and the disk holder 10A cannot be made using the die. . Since the melt flow rate of polypropylene is in the above range, the fluidity of the molten mixture in which paper powder is mixed with polypropylene does not decrease, and the molten mixture does not cause a short mold in the holder molding die. A disk holder 10A having a high flexural modulus and high strength can be made using a mold.

In the disc holder 10A, the weight ratio of polypropylene to the total weight is in the range of 35 wt% or more and less than 50 wt%, and the weight ratio of the paper powder to the total weight is in the range of 50 wt% or more and 65 wt% or less. is there. In the disk holder 10A, the weight ratio of polypropylene is preferably in the range of 40 wt% to 45 wt%, and the weight ratio of paper powder is in the range of 55 wt% to 60 wt%. preferable.

If the weight ratio of polypropylene is less than 35% by weight and the weight ratio of paper powder exceeds 65% by weight, the amount of paper powder increases more than necessary in the disk holder 10A. In some cases, the strength of the disc holder 10A at that location decreases, and when an external force is applied, the disc holder 10A may be damaged or broken at that location. Also, paper powder that does not show fluidity even when overheated significantly reduces the fluidity of the molten mixture, so the molten mixture does not flow smoothly from the gate of the injection molding machine into the mold, Therefore, short molds are likely to occur, which may hinder the manufacture of the disk holder 10A.

When the weight ratio of the paper powder is less than 50% by weight and the weight ratio of the polypropylene is 50% by weight or more, the amount of polypropylene increases more than necessary in the disk holder 10A. The rate and strength cannot be improved. Also, higher combustion temperature than the paper powder, increasing the percentage of emissions is large polypropylene of CO _2, when the disc holder 10A is burned, not only a large amount of CO ₂ is discharged, a high incineration temperature Otherwise, the disc holder 10A cannot be completely burned, and high heat energy is required for incineration.

Since the weight ratio of the paper powder (plant fiber powder) to the total weight of the disk holder 10A is in the range of 50% by weight or more and 65% by weight or less, the flexural modulus is higher than that of the disk holder made of only polypropylene. The upper wall 11, the disk storage area 20, and the first to

fourth ribs

12, 13, 14, and 15 are not broken or damaged, have excellent durability, and can withstand repeated use. . In addition, compared with the case where the disc holder is made only from polypropylene (thermoplastic synthetic resin), the amount of CO ₂ emission generated during the incineration process can be extremely reduced, and the disc holder is made only from polypropylene. Combustion calorie is low compared with a disc holder, and it can be burned completely at a low incineration temperature. Since the weight ratio of polypropylene (thermoplastic synthetic resin) to the total weight of the disk holder 10A is in the range of 35% by weight or more and less than 50% by weight, it is excellent in water resistance and can sufficiently withstand moisture. .

If the average particle size of the paper powder (plant fiber powder) is less than 30 μm, a plurality of pulverization steps are required to process the paper and pulp into an average particle size of less than 30 μm. As a result, the production cost of the disc holder 10A also increases, and the disc holder 10A cannot be manufactured at a low cost. If the average particle diameter of the paper powder exceeds 150 μm, the paper powder may be dispersed poorly in the melted polypropylene, and a paper powder lump may be formed inside the disk holder 10A. The strength of the disc holder 10A at the location where the recording is performed may be significantly reduced, and the disc holder 10A may be easily damaged or broken at that location.

FIG. 6 is a perspective view of the disc holder 10A shown with the disc 84 fitted therein. In order to fit the disc 84 into the disc holder 10A, the center hole 85 of the disc 84 is aligned with the top wall 45 of the fitting portion 37, and the disc 84 is pushed into the fitting portion 37 from above to below. Apply pressure toward. When pressure is applied to the disk 84, the first to third

movable parts

46, 47, 48 (1-1 movable part 54, 1-2 movable part 55, 2-1 movable part 61, 2-2 movable The portion 62, the 3-1 movable portion 68, and the 3-2 movable portion 69) are pressed against the peripheral edge of the central hole 85 of the disk 84, and the

movable portions

46, 47, 48 are elastically deformed. 47 and 48 are easily bent toward the center of the fitting portion 37. When these

movable parts

46, 47, 48 are bent, the

movable parts

46, 47, 48 are located inside the peripheral edge of the central hole 85 of the disk 84, and the central hole 85 of the disk 84 moves the top wall 45 of the fitting portion 37. The central hole 85 can be fitted into the peripheral wall 43 of the fitting portion 37 so as to be pushed downward into the fitting portion 37. When the central hole 85 is fitted into the peripheral wall 43, the bent first to third

movable parts

46, 47, 48 are elastically deformed outward in the direction around the fitting part 37, and the

movable parts

46, 47, 48 are The central hole 85 of the disk 84 is held, and the disk 84 is fixed to the disk storage area 20. When the disc 84 is fixed to the storage portion 20, the peripheral edge of the central hole 85 comes into contact with the mounting portion 38, and the outer peripheral edge of the disc 84 comes into contact with the ridge 40.

In order to remove the disk 84 fixed in the disk storage area 20 from the storage area 20, a finger is put on the outer peripheral edge of the disk 84 and a finger is put on one of the first to

fourth recesses

22, 24, 26, 28. However, the disk 84 is pulled upward in the thickness direction of the disk storage area 20. When the disk 84 is pulled upward, the first to third

movable parts

movable portions

movable parts

46, 47, 48 are bent, the

movable parts

46, 47, 48 are positioned inside the peripheral edge of the central hole 85 of the disk 84, and the central hole 85 of the disk 84 thickens the top wall 45 of the fitting portion 37. The center hole 85 is disengaged from the peripheral wall 43 of the fitting portion 37 so that the disk 84 can be removed from the storage area 20.

Since the first to

fourth ribs

12, 13, 14, 15 are formed on the upper wall 11 of the disk holder 10A, even if an external force is applied to the upper wall 11 and the disk storage area 20 formed there. Irregular deformation in the upper wall 11 and the disk storage area 20 is prevented by the

ribs

12, 13, 14, and 15, and the upper wall 11 and the disk storage area 20 are not cracked. Breakage or breakage of the storage area 20 can be prevented. Even if an external force is applied to the disk holder 10A, the disk holder 10A is not damaged or broken, has excellent durability, and can withstand repeated use. In the disk holder 10A, stripes or strips may be formed in the disk storage area 20 or the first to

fourth recesses

22, 24, 26, 28 during the molding process. Since the

disc facing surfaces

41, 42 of the first to

fourth recesses

22, 24, 26, 28 are subjected to graining, these stripes can be concealed by graining, and the

disc facing surfaces

41, 42 are grained. To improve the edge of the disc holder 10A.

In the disc holder 10A, the first to third

movable portions

46, 47, 48 formed in the fitting portion 37 are a first-first movable portion 54, a first-second movable portion 55, a second-first movable portion 61, Since it is divided into the 2-2 movable part 62, the 3-1 movable part 68, and the 3-2 movable part 69, the

movable parts

46, 47, 48 are easily elastically deformed, and the

movable parts

46, 47, 48 bends easily, the bent

movable parts

46, 47, 48 are easily restored, and the disc 84 can be securely fixed to the fitting portion 37, and the fitting between the disc 84 and the fitting portion 37 is possible. The engagement can be easily released, and the disk 84 can be easily removed from the disk storage area 20.

In the disk holder 10A, the fixing parts are formed of first to

third fixing parts

49, 50, 51, and these fixing

parts

49, 50, 51 are connected to each other at the center of the fitting portion 37. The fixed

portions

49, 50, 51 are not deformed irregularly, and even if an external force is applied to the fixed

portions

49, 50, 51, the fixed

portions

49, 50, 51 are broken. And can prevent damage. In this disc holder 10A, the fixing

portions

49, 50, 51 are not broken or broken, and the central hole 85 of the disc 84 is reliably supported by the fitting portion 37 including the fixing

portions

49, 50, 51. The disc 84 can be reliably fixed to the fitting portion 37, and the removal of the disc 84 from the fitting portion 37 can be reliably prevented.

Since the disc holder 10A is formed with first and second connecting

portions

79 and 82 that connect the first and

second ribs

12 and 13 and the peripheral portion 39 of the disc storage area 20, the first and second ribs are formed. 12 and 13 and the peripheral portion 39 of the disk storage area 20 are reinforced by the connecting

portions

79 and 82, and the breakage and breakage of the first and

second ribs

12 and 13 and the peripheral portion 39 can be prevented. When the first and second connecting

portions

79 and 82 are not formed with the

gaps

80 and 83 having a predetermined length, an irregular bending stress is generated around the connecting

portions

79 and 82 when the disk holder 10A is formed. The upper wall 11 and the disk storage area 20 acting on the upper wall 11 and the disk storage area 20 may be irregularly bent. However, the disc holder 10A has

gaps

80, 83 having a predetermined length between the first and

second ribs

12, 13 and the peripheral portion 39 of the disc storage area 20 in the first and second connecting

portions

79, 82. Therefore, the bending stress acting around the connecting

portions

79 and 82 during the molding process of the disc holder 10A can be dispersed by the

gaps

80 and 83, and the upper wall 11 and the molded disc holder 10A can be dispersed. Irregular bending does not occur in the disk storage area 20.

FIG. 7 is a perspective view of a disk holder 10B shown as another example, and FIG. 8 is a rear view of the disk holder 10B of FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 7 and 8, the vertical direction is indicated by an arrow A, the horizontal direction is indicated by an arrow B, and the thickness direction is indicated by an arrow C (only in FIG. 7). This disc holder 10B is different from that shown in FIG. 1 in that a third connecting portion 86 for connecting the third rib 14 and the peripheral portion 39 of the disc storage area 20 is formed, and the fourth rib 15 and the disc storage area. The fourth connecting portion 88 is formed to connect the 20 peripheral portions 39, and the third connecting portion 86 has a predetermined length between the third rib 14 and the peripheral portion 39 of the disc storage area 20. A gap 87 is formed, and a gap 89 having a predetermined length is formed between the fourth rib 15 and the peripheral edge 39 of the disk storage area 20 in the fourth connecting portion 88. 1 is the same as the disk holder 10A in FIG. 1, and the same reference numerals as those in FIG. Note that FIG. 5 is used for details of the fitting portion 37. Further, the thickness dimensions of the upper wall 11, the disc storage area 20, and the first to

fourth ribs

12, 13, 14, 15 are the same as those of the disc holder 10A of FIG.

In the disc holder 10B, as shown in FIG. 8, the third rib 14 and the peripheral portion 39 of the disc storage area 20 are connected to the center of the third side edge 18 of the upper wall 11 (the third rib 14 and the peripheral portion 39). 3rd connection part 86 is formed. In the third connecting portion 86, a gap 87 (meat stealing) having a predetermined length extending in the vertical direction is formed between the third rib 14 and the peripheral portion 39 of the disc storage area 20. The gap 87 extends upward in the thickness direction from the disk non-facing surface 81 of the upper wall 11 and reaches the center of the third rib 14 in the thickness direction. In addition, a fourth connecting portion 88 that connects the fourth rib 15 and the peripheral portion 39 of the disc storage area 20 (connecting the fourth rib 15 and the peripheral portion 39) to the center of the fourth side edge 19 of the upper wall 11 is provided. Is formed. In the fourth connecting portion 88, a gap 89 (meat stealing) having a predetermined length extending in the vertical direction is formed between the fourth rib 15 and the peripheral portion 39 of the disc storage area 20. The air gap 89 extends upward in the thickness direction from the disk non-facing surface 81 of the upper wall 11 and reaches the center of the fourth rib 15 in the thickness direction.

The disc holder 10B is made of a mixture of polypropylene (polyolefin thermoplastic synthetic resin) and plant fiber powder. In the disc holder 10B, the vegetable fiber powder is substantially uniformly dispersed in the polypropylene. Polypropylene and vegetable fiber powder are the same as those of the disc holder 10A of FIG. The average particle diameter of the vegetable fiber powder is the same as that of the disk holder 10A of FIG. The disk holder 10B can be manufactured by using an injection molding technique. The manufacturing procedure of the disc holder 10B is formed from a pellet forming step for producing a pellet-shaped molding material and a holder molding step for molding the pellet-shaped molding material into a disc holder. Since the pellet forming process and the holder forming process are the same as those of the disk holder 10A of FIG. 1, the detailed description thereof will be omitted.

The molding conditions in the pellet molding process and the holder molding process are the same as those of the disk holder 10A in FIG. Further, the flexural modulus and melt flow rate (MFR) of polypropylene are the same as those of the disk holder 10A of FIG. The weight ratio of polypropylene or vegetable fiber powder to the total weight of the disk holder 10B is the same as that of the disk holder 10A of FIG. The average particle diameter of the vegetable fiber powder is the same as that of the disc holder 10A of FIG.

Since the weight ratio of the paper powder (plant fiber powder) to the total weight of the disk holder 10B is in the range of 50% by weight or more and 65% by weight or less, the flexural modulus is higher than that of the disk holder made of polypropylene alone. The upper wall 11, the disk storage area 20, and the first to

fourth ribs

12, 13, 14, and 15 are not broken or damaged, have excellent durability, and can withstand repeated use. . In addition, compared with the case where the disc holder is made only from polypropylene (thermoplastic synthetic resin), the amount of CO ₂ emission generated during the incineration process can be extremely reduced, and the disc holder is made only from polypropylene. Combustion calorie is low compared with a disc holder, and it can be burned completely at a low incineration temperature. Since the weight ratio of polypropylene (thermoplastic synthetic resin) to the total weight of the disk holder 10B is in the range of 35% by weight or more and less than 50% by weight, it has excellent water resistance and can sufficiently withstand moisture. .

This disk holder 10B has the following effects in addition to the effects of FIG. Since the disc holder 10B is formed with third and fourth connecting

portions

86 and 88 that connect the third and

fourth ribs

14 and 15 and the peripheral edge 39 of the disc storage area 20, the third and fourth ribs are formed. 14 and 15 and the peripheral portion 39 of the disk storage area 20 are reinforced by the connecting

portions

86 and 88, so that the third and

fourth ribs

14 and 15 and the peripheral portion 39 can be prevented from being damaged or broken. When the third and fourth connecting

portions

86 and 88 are not formed with the

gaps

87 and 89 having a predetermined length, irregular bending stresses centered on the connecting

portions

86 and 88 are formed at the time of forming the disk holder 10B. The upper wall 11 and the disk storage area 20 acting on the upper wall 11 and the disk storage area 20 may be irregularly bent. However, this disc holder 10B has

gaps

87 and 89 of a predetermined length between the third and

fourth ribs

14 and 15 and the peripheral portion 39 of the disc storage area 20 in the third and fourth connecting

portions

86 and 88. Therefore, the bending stress acting around the connecting

portions

86 and 88 during the molding process of the disk holder 10B can be dispersed by the

gaps

78 and 89, and the upper wall 11 of the molded disk holder 10B can be dispersed. Irregular bending does not occur in the disk storage area 20.

FIG. 10 is a perspective view of a disc holder 10C shown as another example, and FIG. 11 is a front view of the disc holder 10C of FIG. 12 is a rear view of the disk holder 10C of FIG. 10, and FIG. 13 is a cross-sectional view taken along line 13-13 of FIG. 14 and 15 are partially enlarged views of the fitting means. 10 to 12, the vertical direction is indicated by an arrow A, the horizontal direction is indicated by an arrow B, and the thickness direction is indicated by an arrow C (only in FIG. 10). The disc holder 10C has a predetermined area and has a planar shape of a rectangular upper wall 11, first and

second ribs

fourth ribs

14 and 15 are provided.

The upper wall 11 has first and second side edges 16 and 17 (opposing side edges) extending in the vertical direction and third and fourth side edges 18 and 19 (opposing side edges) extending in the horizontal direction. In the center of the upper wall 11, a disk storage area 20 is formed that is recessed downward in the thickness direction. In the vicinity of the first corner 21 that is the intersection of the first side edge 16 and the third side edge 18 of the upper wall 11, a substantially semicircular first recess 22 that is recessed downward in the thickness direction is formed. In the vicinity of the second corner 23, which is the intersection of the third side edge 18 and the second side edge 17, a substantially semicircular second recess 24 that is recessed downward in the thickness direction is formed. In the vicinity of the third corner 25 that is the intersection of the second side edge 17 and the fourth side edge 19 of the upper wall 11, a substantially semicircular third recess 26 that is recessed downward in the thickness direction is formed. In the vicinity of the fourth corner 27, which is the intersection of the fourth side edge 19 and the first side edge 16, a substantially semicircular fourth recess 28 that is recessed downward in the thickness direction is formed. These

recesses

22, 24, 26 and 28 are connected to the disk storage area 20.

ribs

12 and 15. 36 are linked together.

The disc storage area 20 is a recess formed in a circular shape, and has a size and depth that can store a disc (disk). The disc storage area 20 has a circular flange portion 90 extending from the periphery to the center (from the periphery to the radially inward direction), and a circular opening opening (penetrating) in the thickness direction at the center. The hole 91 is formed. The opening 91 occupies 70 to 90% of the entire area of the disk storage area 20. In the vicinity of the periphery of the disk storage area 20 including the first recess 22, fitting means for removably fitting the periphery 92 (see FIG. 16) of the disk 84 is formed.

The fitting means includes first and second

movable members

93 and 94 that are elastically deformable extending radially outward from the flange portion 90, and a first convex inward in the radial direction from the periphery of the disk storage area 20. The protrusion 95 is formed. The first movable member 93 has a substantially rectangular planar shape, and is inclined upwardly from the flange portion 90 toward the upper wall 11. The first movable member 93 has a base end portion 96 located on the flange portion 90 and a free end portion 97 located on the peripheral side of the disc storage area 20. The free end 97 is formed with an engaging recess 98 that is located in the vicinity of the periphery of the disk storage area 20 and that is recessed radially inward. In the first movable member 93, the free end 97 can be swung upward and downward in the thickness direction with the base end portion 96 as a pivot axis.

The second movable member 94 has a pair of leg portions 99 located on both sides of the first movable member 93 and a free portion 100 connected to the tips of the leg portions 99. The leg portion 99 is inclined upwardly toward the upper wall 11 while extending radially outward from the flange portion 90. The free portion 100 has a substantially rectangular planar shape, is located above the free end 97 of the first movable member 93 in the thickness direction and radially outward, and can be swung upward and downward in the thickness direction. It is. The free portion 100 has an engaging convex portion 101 that is formed at a position facing the engaging concave portion 98 of the free end portion 97 and protrudes radially inward.

The first protrusion 95 is formed on the periphery of the disk storage area 20 facing the first and second movable members 93 and 94 (periphery of the disk storage area 20 extending on the opposite side of the first and second movable members 93 and 94). Formed and at substantially the same height as the top wall 11. A notch 102 that is recessed radially outward from the disk storage area 20 is formed between the first convex portion 95 and the flange portion 90. A pair of second convex portions 103 projecting radially inward from the peripheral edge of the disk storage area 20 are formed on the flange portion 90 extending between the first and second

movable members

93, 94 and the first convex portion 95. Is formed. The second convex portion 103 protrudes upward in the thickness direction from the flange portion 90 and has a height up to substantially the middle between the upper wall 11 and the flange portion 90. The second convex portion 103 supports the peripheral edge portion 92 of the disk 84.

The upper wall 11 and the flange portion 90 have a thickness dimension L1 in the range of 1.3 to 1.4 mm. The first to

fourth ribs

12, 13, 14, 15 have a thickness dimension L2 in the range of 1.3 to 1.4 mm. If the thickness dimensions L1, L2 of the upper wall 11, the flange portion 90, and the first to

fourth ribs

12, 13, 14, 15 are less than 1.3 mm, their strengths are reduced, and the upper wall 11, the flange portion 90, When an external force is applied to the first to

fourth ribs

12, 13, 14, and 15, they may be damaged or broken carelessly. In this disc holder 10A, since the thickness dimensions L1, L2 of the upper wall 11, the flange portion 90, and the first to

fourth ribs

12, 13, 14, 15 are within the above ranges, the upper wall 11, the flange portion 90, the first Even if an external force is applied to the

fourth ribs

12, 13, 14, and 15, they are not damaged or broken.

The disc holder 10C is made of a mixture of polypropylene (polyolefin thermoplastic synthetic resin) and plant fiber powder. In the disc holder 10C, the vegetable fiber powder is dispersed substantially uniformly in the polypropylene. Polypropylene and vegetable fiber powder are the same as those of the disc holder 10A of FIG. The average particle diameter of the vegetable fiber powder is the same as that of the disk holder 10A of FIG. The disc holder 10C can be manufactured by using an injection molding technique. The manufacturing procedure of the disc holder 10 </ b> C is formed from a pellet forming step for producing a pellet-shaped molding material and a holder molding step for molding the pellet-shaped molding material into a disc holder. Since the pellet forming process and the holder forming process are the same as those of the disk holder 10A of FIG. 1, the detailed description thereof will be omitted.

The molding conditions in the pellet molding process and the holder molding process are the same as those of the disk holder 10A in FIG. Further, the flexural modulus and melt flow rate (MFR) of polypropylene are the same as those of the disk holder 10A of FIG. The weight ratio of polypropylene or vegetable fiber powder to the total weight of the disk holder 10C is the same as that of the disk holder 10A of FIG. The average particle diameter of the vegetable fiber powder is the same as that of the disc holder 10A of FIG.

Since the weight ratio of the paper powder (plant fiber powder) to the total weight of the disk holder 10C is in the range of 50% by weight or more and 65% by weight or less, the bending elastic modulus is compared with the disk holder made of only polypropylene. The upper wall 11, the flange portion 90, and the first to

fourth ribs

12, 13, 14, and 15 are not broken or damaged, have excellent durability, and can sufficiently withstand repeated use. In addition, compared with the case where the disc holder is made only from polypropylene (thermoplastic synthetic resin), the amount of CO ₂ emission generated during the incineration process can be extremely reduced, and the disc holder is made only from polypropylene. Combustion calorie is low compared with a disc holder, and it can be burned completely at a low incineration temperature. Since the weight ratio of polypropylene (thermoplastic synthetic resin) to the total weight of the disc holder 10C is in the range of 35% by weight or more and less than 50% by weight, it has excellent water resistance and can sufficiently withstand moisture. .

FIG. 16 is a perspective view of the disc holder 10C shown with the disc 84 fitted therein. In order to fit the disc 84 into the disc holder 10 </ b> C, after inserting one of the peripheral portions 92 of the disc 84 into the notch 102 formed between the first convex portion 95 and the flange portion 90, The other peripheral edge 92 is positioned between the free end 97 of the first movable member 93 and the free portion 100 of the second movable member 94, and the other peripheral edge 92 of the disk 84 is the free end of the first movable member 93. A pressure is applied to the other peripheral edge 92 of the disk 84 from the upper side to the lower side in the thickness direction so as to be pushed between the portion 97 and the free portion 100 of the second movable member 94. When pressure is applied to the other peripheral edge 92 of the disk 84, the first movable member 93 and the second movable member 93 are pressed downward in the thickness direction, and the free end 97 of the first movable member 93 pushes the base end 96. While turning in the thickness direction downward as the turning axis, the free portion 100 of the second movable member 94 turns in the thickness direction downward using the leg portion 99 as the turning axis.

When the free end portion 97 of the first movable member 93 and the free portion 100 of the second movable member 94 pivot downward in the thickness direction, the free end portion 97 of the first movable member 93 and the free portion 100 of the second movable member 94 Are spaced apart in the radial direction to form a gap between the free end 97 and the free part 100, and the other peripheral edge 92 of the disk 84 enters the gap. When the other peripheral edge 92 of the disk 84 enters the gap, the pressing force acting on the second movable member 94 is released, and the free portion 100 of the second movable member 94 turns upward in the thickness direction. The other of the portions 92 is sandwiched between the engagement concave portion 98 of the free end portion 97 of the first movable member 93 and the engagement convex portion 1001 of the free portion 100 of the second movable member 94, and one of the peripheral portions 92 of the disk 84 is It fits in the notch 102 between the first convex portion 95 and the flange portion 90. Note that the free end 97 of the first movable member 93 acts so as to push the other peripheral edge 92 of the disk 84 upward in the thickness direction by its elastic force, whereby the disk 84 is supported by the disk holder 10C. At this time, the peripheral edge portion of the disk 84 comes into contact with the second protrusion 103, and the downward movement of the disk 84 in the thickness direction is prevented by the second protrusion 103.

In order to remove the disk 84 fixed to the disk storage area 20 from the storage area 20, the free portion 100 of the second movable member 94 is moved downward in the thickness direction against the elastic force of the free end 97 of the first movable member 93. Press. When the free portion 100 of the second movable member 94 is pressed downward in the thickness direction, the free portion 100 of the second movable member 94 turns downward in the thickness direction using the leg portion 99 as a turning axis. When the free portion 100 of the second movable member 94 pivots downward in the thickness direction, the free end portion 97 of the first movable member 93 and the free portion 100 of the second movable member 94 are separated in the radial direction from the free end portion 97. A gap is formed between the free portion 100, and the other peripheral edge 92 of the disk 84 is connected to the engagement concave portion 98 of the free end portion 97 of the first movable member 93 and the engagement convexity of the free portion 100 of the second movable member 94. After removing the other peripheral edge 92 of the disk 84 from between the engaging recess 98 and the engaging convex 101, one of the peripheral edges 92 of the disk 84 is the first convex. The disc 84 can be removed from the storage area 20 by taking out from the notch 102 between the portion 95 and the flange portion 90.

Since the first to

fourth ribs

12, 13, 14, and 15 are formed on the upper wall 11 of the disk holder 10C, even if an external force is applied to the upper wall 11 and the flange portion 90 formed there, Irregular deformation in the upper wall 11 and the flange portion 90 is prevented by the

ribs

12, 13, 14, and 15, and the upper wall 11 and the flange portion 90 are not cracked. Damage and breakage can be prevented. Even if an external force is applied to the disk holder 10C, the disk holder 10C is not damaged or broken, has excellent durability, and can withstand repeated use.

Since the disc holder 10C is formed of the first and second

movable members

93, 94 and the first convex portion 95 whose fitting means can be elastically deformed, when the disc 84 is pushed into the disc storage area 20, the first The second

movable members

93 and 94 are turned downward from the upper wall 11 in the thickness direction, and the other peripheral edge 92 of the disk 84 is engaged with the engagement recess 99 of the first movable member 93 and the second movable member 94. The disc 84 can be pushed into the convex portion 101 and the disc 84 can be fixed to the disc storage area 20. Further, when the second movable member 94 is turned downward in the thickness direction from the upper wall 11, the peripheral edge portion 92 of the disk 84 becomes the engagement concave portion 99 of the first movable member 93 and the engagement convex portion of the second movable member 94. 101, the engagement between the peripheral portion 92 of the disk 84 and the disk storage area 20 can be easily released, and the disk 84 can be easily removed from the disk storage area 20. Since the disc holder 10C has the opening 91 formed in the center of the disc storage area 20, the material can be saved correspondingly, and the disc holder 10C can be manufactured at low cost.

The disc holder 10C moves downward in the thickness direction of the disc 84 in the disc storage area 20 because the peripheral edge 92 of the disc 84 comes into contact with the second convex portion 103 when the disc 84 is stored in the disc storage area 20. This is prevented by the second convex portion 103. When the disk 84 stored in the disk storage area 20 moves downward in the thickness direction in the storage area 20, the peripheral edge portion 92 of the disk 84 is engaged with the engagement concave portion 99 of the first movable member 93 and the engagement convex portion 101 of the second movable member 94. In this case, the disc holder 10C is prevented from moving downward in the thickness direction of the disc 84 in the disc storage area 20 by the second convex portion 103. The portion 92 is not inadvertently detached from between the engagement concave portion 99 of the first movable member 93 and the engagement convex portion 101 of the second movable member 94, and the disc 84 is securely fixed to the disc storage area 20. Can do.

10A Disc holder

10B Disc holder

10C Disc holder 11 Upper wall 12 First rib 13 Second rib 14 Third rib 15 Fourth rib 20 Disc storage area 37 Fitting portion 38 Disc placement portion 39 Peripheral portion 43 Peripheral wall 45 Top wall 46 First movable portion 47 Second movable portion 48 Third movable portion 49 First fixed portion 50 Second fixed portion 51 Third fixed portion 52 First notch 53 Second notch 54 1-1 First movable portion 55 First 1-2 movable Part 56 first horizontal part 57 vertical part 58 second horizontal part 59 third notch 60 fourth notch 61 2-1 movable part 62 2-2 movable part 63 first horizontal part 64 vertical part 65 second horizontal part 66 5th notch 67 6th notch 68 3rd-1 movable part 69 3-2nd movable part 70 1st horizontal part 71 Vertical part 72 1st Horizontal portion 79 First connecting portion 80 Air gap 82 Second connecting portion 83 Air gap 86 Third connecting portion 87 Air gap 88 Fourth connecting portion 89 Air gap 90 Flange portion 91 Opening hole 93 First movable member 94 Second movable member 95 First convex Part 96 Base end part 97 Free end part 98 Engaging concave part 99 Leg part 100 Free part 101 Engaging convex part 102 Notch part 103 Second convex part

Claims

In the disk holder in which the disk storage area that is recessed downward from the upper wall is formed on the upper wall of the rectangular planar shape, and in the disk holder that holds the disk in the disk storage area in a detachable manner,
The disk holder is made of a mixture obtained by kneading a polyolefin-based thermoplastic synthetic resin and a vegetable fiber powder having an average particle diameter of 30 to 150 μm under heating, and is based on the total weight of the disk holder. The weight ratio of the plant fiber powder with respect to the total weight of the disc holder is in the range of 50 wt% or more and 65 wt% or less. Features disc holder.
Polypropylene is used for the thermoplastic synthetic resin, paper powder is used for the vegetable fiber powder, and the polypropylene has a flexural modulus of 1800 MPa to 2000 MPa and a melt flow rate (MFR) (230 ° C.). 2. A disk holder according to claim 1, wherein a grade of 50 g / 10 min or more and 60 g / 10 min or less is used at 2,16 kg, 1φ orifice).
At the center of the disc storage area, a fitting portion is formed that protrudes upward from the disc storage area and removably fits the central hole of the disc. The upper wall has one of the upper walls. The first and second ribs extending downward from the opposing side edge and the third and fourth ribs extending downward from the other opposing side edge of the upper wall are connected to each other, and the fitting portion is directed in the circumferential direction. Elastically deformable first to third movable parts that are spaced apart at equal intervals and project toward the center of the fitting portion, and a fixed part that extends between the movable parts are defined. One movable portion is divided into a first movable portion and a first movable portion that can be elastically deformed by being divided into two directions around the fitting portion, and the second movable portion is divided into the fitting portion. Divided into a 2-1 movable part and a 2-2 movable part that can be elastically deformed by being divided in the circumferential direction 3. The third movable portion is divided into a 3-1 movable portion and a third-2 movable portion that are divided into two around the fitting portion and elastically deformable. Disc holder.
The first movable portion is partitioned from the fixed portion by a first notch that protrudes from the disk storage area extending in the vicinity of the fitting portion toward the center of the fitting portion, and in the vicinity of the fitting portion. The first movable portion is divided into the first and second movable portions by a second notch that reaches the first notch from the disk storage area extending to the first notch, and the second movable portion is located in the vicinity of the fitting portion. A fourth notch that is partitioned from the fixed portion by a third notch that protrudes from the extending disc storage area toward the center of the fitting portion, and that reaches the third notch from the disc receiving area that extends in the vicinity of the fitting portion. The 2-1 movable part and the 2-2 movable part are bisected by a notch, and the third movable part protrudes from the disk storage area extending in the vicinity of the fitting part toward the center of the fitting part. The fifth knot And the third movable portion and the third movable portion are divided into two by a sixth notch that reaches the fifth notch from a disk storage area that is partitioned from the fixed portion and extends in the vicinity of the fitting portion. The disk holder according to claim 3.
A first fixed part extending between the first movable part and the second movable part; a second fixed part extending between the second movable part and the third movable part; The third fixed part formed between a third movable part and the first movable part, and the fixed parts are connected to each other at the center of the fitting portion. Disc holder.
The disc holder includes a first connecting portion that connects the first rib and the peripheral portion of the disc storage area, and a second connecting portion that connects the second rib and the peripheral portion of the disc storage region. 6. The air gap having a predetermined length is formed between the first and second ribs and a peripheral edge portion of the disk storage area in the first and second connecting portions. Crab disk holder.
The disc holder includes a third connecting portion that connects the third rib and the peripheral portion of the disc storage area, and a fourth connecting portion that connects the fourth rib and the peripheral portion of the disc storage region. The formed third and fourth connecting portions, wherein a gap having a predetermined length is formed between the third and fourth ribs and a peripheral portion of the disk storage area. Crab disk holder.
The disk holder according to any one of claims 3 to 7, wherein in the disk storage area, the disk facing surface is subjected to a textured process.
The disc storage area is formed of a flange portion that extends radially inward from the peripheral edge thereof to support the peripheral edge portion of the disk, and an opening hole that opens to the center thereof. Fitting means for detachably fitting the peripheral edge of the disc is formed, and the upper wall includes first and second ribs extending downward from one opposing side edge of the upper wall, and the upper wall The third and fourth ribs extending downward from the other opposite side edge of the first and second ribs are connected to each other, and the fitting means is inclined upwardly toward the upper wall while extending radially outward from the flange portion. A first movable member that is elastically deformable, a second movable member that is elastically deformable extending radially outward from the flange portion, and a peripheral edge of the disk storage area that faces the first and second movable members. The first convex part that is convex inward in the radial direction The first movable member is formed in the vicinity of the periphery of the disk storage area and has an engagement recess that is recessed radially inward, and the second movable member is positioned on both sides of the first movable member. A pair of leg portions that extend radially outward from the flange portion and incline in an upward gradient toward the upper wall, and are connected to the distal ends of the leg portions so as to be above the first movable member and in the radial direction. A free portion that is located outward and pivotable in the thickness direction, and the free portion is formed at a position facing the engaging recess of the first movable member and is convex radially inward. And a peripheral edge of the disc is sandwiched between the engaging concave portion of the first movable member and the engaging convex portion of the second movable member, and the first convex portion and the flange The disc is fixed in the disc storage area. Disc holder according to claim 1 or claim 2 that.
The flange portion extending between the first and second movable members and the first convex portion protrudes radially inward from the peripheral portion of the disc storage area to support the peripheral portion of the disc. The disc holder according to claim 9, wherein the second convex portion is formed.