[0001] The present invention relates to a pair of roll support members that are used when
housing in a packaging material a roll-form recording material comprising a long length
of recording material sheet wound around a cylindrical core, and a recording material
package in which a roll-form recording material has opposite ends thereof supported
by a pair of roll support members and is housed in a packaging material.
[0002] Conventionally, when storing and transporting a long length of recording material
sheet, the recording material sheet is generally wound into roll form around a cylindrical
core, then housed in a pulp-made packaging material such as a corrugated cardboard
housing, and stored and transported. The outermost peripheral portion of such a roll-form
recording material sheet (hereinafter called a roll-form recording material) is usually
covered by a light-shielding sheet so that, when the recording material is a light-sensitive
material, it is not exposed to light or damaged, and the opposite ends thereof in
the width direction are also protected by light-shielding protecting plates so that
it is not exposed to light or damaged from the opposite ends. Furthermore, when such
a light-sensitive material roll is housed in a packaging material, it is necessary
to protect the light-sensitive material roll so that it will not be deformed or damaged
by a physical impact such as being dropped and the light-sensitive material will not
be recorded on due to the light-shielding sheet or protecting plate being damaged.
[0003] With regard to a method for protecting a roll-form recording material and housing
it in a packaging material, for example, a roll support member having a protruding
portion formed integrally with a flat substrate (a flange having a protruding portion)
has been proposed. By inserting the protruding portion of each of a pair of the roll
support members into one of opposite ends of a core of the roll-form recording material,
the roll-form recording material is supported by the flat substrates when housing
the roll-form recording material in the packaging material, and it is therefore possible
to support the recording material so that it is not in contact with the packaging
material. However, when this roll support member is formed using a synthetic resin
material as a main component, the flat substrate has the problem that its cushioning
properties and mechanical strength are insufficient. That is, when a recording material
package employing such a roll support member is exposed to a physical impact such
as being dropped, the impact is transmitted directly to the roll-form recording material,
thus deforming or damaging the roll-form recording material, or breaking the flat
substrate thereby making it impossible to support the roll-form recording material
in some cases. On the other hand, when the roll support member is formed using as
a main component material a highly cushioning synthetic resin foamed material, even
when the recording material package receives a physical impact such as being dropped,
since the impact is absorbed by the flat substrate and is not transmitted to the roll-form
recording material, the roll-form recording material will not be deformed or damaged.
However, in this case, since a standard roll-form recording material is heavy (e.g.,
4 kg or more), the protruding portions cannot bear the weight reliably and are damaged,
thus easily becoming unable to support the roll-form recording material, which is
a problem.
[0004] On the other hand, when the roll-form recording material is stored for a long period
of time, in a case in which the recording material is a light-sensitive material,
a silver compound, etc. contained in the light-sensitive material reacts with moisture
in air, thus degrading the light-sensitive material and causing uneven recording in
some cases. Since the outer peripheral portion and the end portion of the light-sensitive
material roll are covered by the light-shielding sheet and the protecting plate as
described above, moisture in the air hardly penetrates it. On the other hand, a pulp
material is widely employed as the core of the light-sensitive material roll, the
pulp material being advantageous in terms of strength and cost but having poor moisture
resistance, and the hollow portion thereof is usually in contact with the outside
air. Therefore, when the light-sensitive material roll is stored for a long period
of time, not only is it necessary to protect the light-sensitive material roll from
physical impact and prevent it from being deformed or damaged, but also it is necessary
to prevent the hollow portion of the core from contacting the outside air and moisture
penetrating.
[0005] A roll support member has been proposed that is formed from a highly moisture-resistant
synthetic resin, can be inserted (fitted) into a core, and is used in combination
with a cushioning member formed from a low density material, that is, a recording
material package (recording material) in which a roll-form recording material core
and a roll support member therefor are united with a cushioning member therebetween
and housed in a packaging material. Since the roll-form recording material core is
thus blocked by the highly moisture-resistant roll support members inserted (fitted)
thereinto, the hollow portion of the core is not in contact with the outside air.
Moreover, even when the recording material package is exposed to a physical impact
such as being dropped, since the cushioning member, which is formed from a low density
material, alleviates the impact, the roll support member and the roll-form recording
material are resistant to deformation and damage.
[0006] However, even the above-mentioned roll support member comprising the roll support
member and the cushioning member has the problem that the cushioning member, which
is a low density material, has poor resilience and is deformed by a physical impact
such as being dropped. In particular, when the impact is large or repetitive, the
cushioning member is deformed, thus degrading the cushioning properties. When the
recording material package receives an impact in this state, the impact is readily
transmitted to the roll-form recording material, thus damaging or deforming the roll-form
recording material. Because of this, in order to store and transport the roll-form
recording material for a long period of time, it is necessary to make the cushioning
member larger so that even when the cushioning member is deformed, the cushioning
properties can be retained. However, making the cushioning member larger requires
a large packaging material for it to be housed in, it is disadvantageous in terms
of resources and cost, and the space efficiency for its subsequent storage and the
efficiency of transporting it are correspondingly degraded. Furthermore, since the
roll support member and the cushioning member are molded using different materials,
the number of production steps is large, the cost is high, and there are also disadvantages
when it is recycled or disposed of after use.
[0007] As a solution to these problems, a roll support member in which a flange portion
and a cylindrical shaft for supporting a roll-form recording material are integrally
formed has been disclosed (ref. JP-A-11-327089, JP-A-7-330032, and JP-A-2002-244249
(JP-A denotes a Japanese unexamined patent application publication)). However, this
has the problem that in order to maintain sufficient strength against the impact of
being dropped, the thickness of the roll support member must be increased, and there
has been a desire for further improvement.
[0008] An object of the present invention is therefore to provide a roll support member
that can support a roll-form recording material without damaging, deforming, or degrading
the roll-form recording material even when it is housed in a packaging material and
stored or transported for a long period of time, and that can reduce the production
cost by making the thickness of the roll support member material thinner. Another
object of the present invention is to provide a recording material package that enables
efficient storage and transportation to be carried out.
[0009] One of the objects of the present invention can be attained by the roll support member
below.
(1) A roll support member comprising a four corner-cut rectangular substrate portion,
a cylindrical protruding portion that is formed integrally with the substrate portion
in the center of the surface on one side of the substrate portion and has the extremity
thereof closed, and projecting portions that are formed integrally with the substrate
portion so as to extend from each of four corners of the substrate portion in the
direction in which the cylindrical protruding portion is formed, wherein the substrate
portion has ribs formed on the surfaces of both sides thereof, the cylindrical protruding
portion has a hollow interior portion formed therein, the hollow interior portion
has a rib disposed in a cylindrical shape that is substantially concentric with the
cylindrical protruding portion, and a radial rib disposed so as to provide a connection
between the concentric cylindrical rib and the surface on the hollow interior portion
side of the cylindrical protruding portion, the side of the substrate portion on which
the cylindrical protruding portion is formed is provided with a U-shaped channel in
a section where the cylindrical protruding portion and the substrate portion intersect,
the channel surrounding the base of the cylindrical protruding portion, and the channel
has a rib therewithin, the rib being disposed in a radial manner with the cylindrical
protruding portion as the center.
[0010] Preferred embodiments of the roll support member are listed below.
(2) The roll support member according to (1), wherein the projecting portions are
provided so as to extend outward relative to the outer periphery of the substrate
portion, and the projecting portions have a rib on the inner side thereof.
(3) The roll support member according to either (1) or (2), wherein the reverse surface
of the bottom of the channel has no rib.
(4) The roll support member according to any one of (1) to (3), wherein the substrate
portion has an outer peripheral portion between the outer periphery of the channel
and the outer edge of the substrate portion, and the outer peripheral portion has
on both sides a plurality of radially disposed ribs.
(5) The roll support member according to any one of (1) to (4), wherein the rectangular
shape is a square having sides of 120 to 190 mm, and the cylindrical protruding portion
has a height of 10 to 40 mm.
(6) The roll support member according to any one of (1) to (5), wherein the projecting
portions have an identical height and are no shorter than the height of the cylindrical
protruding portion.
(7) The roll support member according to any one of (1) to (6), wherein the side of
the substrate portion opposite to the side where the cylindrical protruding portion
is formed is provided with a depression for holding a roll-form recording material.
(8) The roll support member according to any one of (1) to (7), wherein in order to
stack at least two roll support members, the projecting portion has a step provided
at the extremity thereof, or the substrate portion has a notch provided therein.
(9) The roll support member according to any one of (1) to (8), wherein the roll support
member is made of a block copolymer of polyethylene and polypropylene.
[0011] The other object of the present invention can be solved by the recording material
package below.
(10) A recording material package in which a roll-form recording material is suspended
and supported by the roll support member according to any one of (1) to (9) and housed
in a rectangular parallelepiped housing.
[0012] In accordance with the present invention, a roll support member having high resistance
to drop impact can be obtained with low cost even when it is made of a thin, low strength
material.
FIG. 1 is a schematic perspective view of each member when a roll-form recording material
having a roll support member of one embodiment of the present invention mounted on
each end thereof is housed in a case.
FIG. 2 is a schematic perspective view of the side of the roll support member of the
embodiment of the present invention from which the cylindrical protruding portion
projects.
FIG. 3 is a schematic perspective view of the side of the roll support member of the
embodiment of the present invention opposite to that from which the cylindrical protruding
portion projects.
FIG. 4 is a schematic cross sectional perspective view along line A-A' of FIG. 2.
FIG. 5 is a schematic perspective view of roll support members of the embodiment of
the present invention when stacked.
FIG. 6 is a schematic cross sectional view along line B-B' of FIG. 5.
FIG. 7 is a schematic perspective view of roll support members of one embodiment of
the present invention when stacked.
FIG. 8 is a schematic perspective view of roll support members of one embodiment of
the present invention when stacked.
[0013] Modes for carrying out the present invention are explained below with reference to
FIGS. 1 to 8, but the present invention is not limited thereto.
[0014] FIG. 1 shows a schematic perspective view of each member when a roll-form recording
material having the roll support member of the present invention mounted on each end
thereof is housed in a case. In FIG. 1, a roll-form recording material 1 wound around
a hollow cylindrical core 2 is wrapped with a light-shielding leader 14 and a light-shielding
flange 15. Roll support members 3 are preferably made by injection molding. The roll-form
recording material 1 is suspended and supported by the roll support members 3, and
housed in a rectangular parallelepiped housing (case) 7.
[0015] The roll-form recording material referred to in the present invention is a recording
material in a state in which a long length of wide recording material is wound around
a core in roll form. The long length of wide recording material referred to here is,
for example, a recording material generally having a width of 152 mm, 610 mm, 864
mm, 1213 mm, etc. and a length of about 30 to 130 m. It is of course possible for
the width and the length to be larger than the above. The roll-form recording material
referred to in the present invention is not particularly limited and can include all
types of image recording materials such as light-sensitive material used for photography,
printing, photocopying, etc. and color copier image receiving paper. The light-sensitive
material is not limited to a silver halide light-sensitive material (including a heat-developable
light-sensitive material) and includes various types of light-sensitive material film,
printing paper, etc.
[0016] Perspective views of one example of the roll support member of the present invention
are shown in FIG. 2 and FIG. 3, and a cross-sectional view thereof is shown in FIG.
4. The roll support member of the present invention is explained below with reference
to FIGS. 2 to 4. The roll support member 3 of the present invention comprises a rectangular
substrate portion 4 having its mechanical strength improved by forming ribs on at
least one side thereof, and preferably on both sides thereof, a cylindrical protruding
portion 5 that is formed integrally with the substrate portion 4 at the center of
one side of the substrate portion 4 and has the extremity thereof closed, and projecting
portions 6 that are provided integrally with the substrate portion 4 so as to extend
orthogonally from the four corners of the substrate portion 4. The substrate portion
4 has an outer peripheral portion between the outer periphery of a channel 8 and the
outer edge of the substrate portion 4. Ribs 4a are provided on the outer peripheral
portion of the substrate portion 4 on the side where the cylindrical protruding portion
5 is formed. In order to further improve the mechanical strength, it is desirable
to provide ribs 4b on the opposite side. The ribs 4a and the ribs 4b are preferably
provided in a radial manner.
[0017] The dimensions of the substrate portion 4, that is, the distance W between two opposing
sides of the square of the substrate portion 4, can be varied appropriately depending
on the length of the recording material wound around the core 2, and are preferably
120 to 190 mm.
[0018] The dimensions of the ribs 4a and the ribs 4b are preferably such that the height
is in the range of 5 to 30 mm and the thickness is in the range of 1 to 2 mm, and
the dimensions of each thereof may be identical to or different from each other. The
ribs are usually formed as shown, for example, in FIG. 2 and FIG. 3, in a radial manner
with the cylindrical protruding portion 5 as the center that is formed at substantially
the center of the substrate portion 4. Furthermore, the four corners of the substrate
portion 4 are preferably cut off so that an impact will not be concentrated on the
corners and break them. Moreover, the rectangular shape of the substrate portion 4
is preferably a square. This is because, when the roll-form recording material supported
by the roll support members is housed in a packaging material, it is possible to reduce
wasted space and further reduce the dimensions of the packaging material.
[0019] The outer diameter of the cylindrical protruding portion 5 is preferably smaller
than the inner diameter of the core 2 of the roll-form recording material by an amount
in the range of 0.1 to 3 mm. When the difference between the outer diameter of the
cylindrical protruding portion 5 and the inner diameter of the core 2 is in the above-mentioned
range, since the cylindrical protruding portion 5 can easily be inserted into the
core 2 and the hollow interior portion of the core 2 does not make contact with the
outside air, it is resistant to moisture entrapment. Furthermore, the height of the
cylindrical protruding portion 3 is preferably in the range of 10 to 40 mm, and more
preferably in the range of 20 to 30 mm. When the height of the cylindrical protruding
portion is in the above-mentioned range, since the cylindrical protruding portion
5 can easily be inserted into the core 2 and the hollow interior portion of the core
2 does not make contact with the outside air, it is resistant to moisture entrapment.
[0020] The projecting portions 6 are preferably provided in the same direction as that of
cylindrical protruding portion 5, which has its extremity closed. Moreover, it is
preferable for all of the projecting portions 6 to have an identical height and for
it to be the same as or higher than that of the cylindrical protruding portion 5.
Adjusting the height of the projecting portions in this way enables the roll-form
recording material to be supported in a stable manner.
[0021] As shown in FIG. 3, in the roll support member 3 of the present invention, the cylindrical
protruding portion 5 forms a hollow interior portion and has within the hollow interior
portion a concentric cylindrical rib 5a disposed in a cylindrical shape that is substantially
concentric (coaxial) with the cylindrical protruding portion, and radial ribs 5b that
are disposed so as to provide a connection between the concentric cylindrical rib
5a and the surface on the hollow interior portion side of the cylindrical protruding
portion 5. By providing the ribs within the cylindrical protruding portion 5 the cylindrical
protruding portion 5 of the roll support member 3 can be prevented from being damaged
when the recording material package is dropped, etc. Conventionally, in order to maintain
the strength of the cylindrical protruding portion 5, it has been necessary to make
the cylindrical protruding portion 5 thick, but since the strength of the roll support
member 3 of the present invention can be maintained by the ribs within the cylindrical
protruding portion 5, it is unnecessary to make the cylindrical protruding portion
5 thick. The cylindrical protruding portion 5 of the present invention preferably
has a thickness S of 0.5 to 3 mm.
[0022] As shown in FIG. 2 and FIG. 3, in the roll support member 3 of the present invention,
the channel 8, which is U-shaped, is provided on the side of the rectangular substrate
portion 4 on which the cylindrical protruding portion 5 is formed in a section where
the cylindrical protruding portion 5 and the rectangular substrate portion 4 intersect,
so as to surround the base of the cylindrical protruding portion 5. The channel 8
has in the interior thereof ribs 8a disposed in a radial manner with the cylindrical
protruding portion 5 as the center. The reverse surface 8b of the bottom of the channel
8 (the side where there is no cylindrical protruding portion and there are no projecting
portions) preferably has no ribs and is smooth. The depth of the channel is preferably
such that the reverse surface of the bottom of the channel is level with the height
of the ribs 4b.
[0023] As shown in FIG. 4, it is preferable to provide depressions on the side of the substrate
portion 4 that is opposite to the side where the cylindrical protruding portion 5
is provided. By placing the roll-form recording material 1 on the reverse surface
of the substrate portion 4 with the cylindrical protruding portion 5 facing downward,
the roll-form recording material 1 can be held by the depressions, and it can therefore
be used as a roll-form recording material holder.
[0024] FIG. 5 shows a schematic perspective view of the roll support members of the embodiment
of the present invention when stacked. FIG. 6 is a schematic cross-sectional view
along line B-B' of FIG. 5.
[0025] As shown in FIG. 5, the projecting portions 6 are preferably provided so as to extend
outward relative to the outer periphery of the four corner-cut rectangular substrate
portion 4. Furthermore, ribs 6a are preferably provided on the inside of the projecting
portions 6. Providing the ribs 6a enables the strength of the projecting portions
6 to be increased. In addition, as shown in FIG. 5 and FIG. 6, when the roll support
members are stacked for storage, the rectangular substrate portion 4 is contained
within the four projecting portions 6 and, furthermore, the rectangular substrate
portion 4 can be retained by the ribs 6a, thus making the stacking properties excellent.
The height H of the ribs 6a is preferably 15 to 25 mm from the viewpoint of supporting
the substrate portion 4.
[0026] As other embodiments, FIG. 7 and FIG. 8 show a schematic perspective view when the
roll support members of the present invention are stacked. In FIG. 7, the projecting
portion 6 of the roll support member has step portions 6b provided at the extremity
thereof. These step portions 6b retain the rectangular substrate portion 4, thus enabling
the roll support members to be stored in a stacked state. In FIG. 8, the substrate
portion 4 of the roll support member has notches 4c provided therein. By superimposing
the notches 4c on the projecting portions 6, the roll support members can be stored
in a stacked state.
[0027] The roll support member of the present invention comprises a block copolymer of polyethylene
and polypropylene as a main component material. The mixing ratio of the polyethylene
relative to the polypropylene is preferably in the range of 2 to 15 wt %. Examples
of such a block copolymer of polyethylene and polypropylene include BC1B, BC2E, BC3M,
BC4, BC4ASW, BC5C, BC6, and BC8 (manufactured by Japan Polychem Corp.) and J-466HP
(manufactured by Idemitsu Petrochemical). The roll support member of the present invention
is preferably formed by injection molding. In order to improve the moldability during
injection molding and reduce the friction of the contact surfaces of the roll support
member and the light-sensitive material roll, it is preferable to add a silicone resin
(e.g., Silicone MCP manufactured by Hexa Chemical Co., Ltd.) to the block copolymer
of polyethylene and polypropylene in the range of 0.3 to 3 wt %.
[0028] A paper material used for the rectangular parallelepiped case 7 is not particularly
limited, but corrugated cardboard is preferable from the viewpoint of handling, ease
of production, and strength. With regard to the corrugated cardboard, general A flute
to E flute double-faced corrugated cardboard, and double-walled corrugated cardboard
such as those described in 'Saishin Kami Kako Binran (Current Paper Processing Handbook)'
Ed. by The Paper Processing Handbook Committee (K.K. Tech Times, 1988) are preferably
used, but there are no particular restrictions. It is selected appropriately according
to the dimensions of the roll-form recording material.
[0029] A light-shielding moisture-resistant material of a light-shielding sheet, a light-shielding
protection plate, etc. is not particularly limited as long as it does not affect the
photographic performance and it has light-shielding and moisture-resistant performance
and, for example, light-shielding moisture-resistant materials described in JP-A-6-95302
and JP-A-8-179473 can be used.
[0030] That is, as shown in FIG. 1, the recording material package of the present invention
is formed by inserting the cylindrical protruding portion 5 of the roll support member
3 of the present invention into each of opposite ends of the core 2 of the roll-form
recording material 1, and housing it in the rectangular parallelepiped housing (case)
7 such as a corrugated cardboard housing. The roll-form recording material of the
present invention, in particular a roll-form light-sensitive material, is produced
by winding a long length of recording material sheet around the cylindrical core 2
having a light-shielding flange 15 with light-shielding properties at opposite ends
for protection so that the light-sensitive material will not be exposed to light and
the light-sensitive material will not be scratched by contact with the roll support
members. The outer periphery of the roll-form recording material 1 is protected by
the light-shielding leader 14 so that the recording material will not be recorded
on during storage. Furthermore, the roll-form recording material 1 is preferably protected
by a moisture-resistant sheet, etc. so that the recording material will not be degraded
by moisture in the air.
[0031] The roll-form recording material housed in the packaging material in this way is
supported by the roll support members so that the recording material sheet protected
by the light-shielding leader will not come into contact with the packaging material.
[0032] As hereinbefore described, in the roll support member 3 of the present invention,
since the substrate portion 4 of the support member has the ribs 4a and 4b and, moreover,
the hollow interior portion of the cylindrical protruding portion 5 also has the ribs
5a, the mechanical strength is high and physical impacts can be absorbed, thereby
preventing any damage or deformation. The roll support member 3 of the present invention
enables the roll-form recording material 1 to be stored and transported in a packaging
material for a long period of time without damaging or deforming the roll-form recording
material and enables the recording material to be supported without degrading it.
Furthermore, the cylindrical protruding portion 5 can be made of a thin material and,
moreover, since the substrate portion 4, the cylindrical protruding portion 5, and
the projecting portion 6 are formed integrally, the roll support member 3 of the present
invention enables the production time to be shortened by 25% and the total weight
of the roll support member 3 to be reduced by 30% compared with a conventional arrangement.
The recording material package employing the roll support member 3 of the present
invention can therefore be made with low cost and stored and transported efficiently.
Examples
[0033] Examples are explained below, but the present invention is not limited to these examples.
Production of roll support member
[0034] Roll support members were produced as shown in Table 1 by injection molding of a
block copolymer of polyethylene and polypropylene (PE-PP). In the roll support members
thus obtained, the substrate portion had ribs on both sides, the outer diameter of
the cylindrical protruding portion was smaller by 1 mm than the inner diameter of
the core of the light-sensitive material roll, and the height of the cylindrical protruding
portion was 30 mm.
[0035] The substrate portion of the roll support member thus obtained was compressed by
a compression tester, and the amount of deformation of a part thus compressed was
obtained. The amount of deformation in Table 1 is the ratio of the amount of deformation
of each sample relative to the amount of deformation of a Reference Example sample.
Table 1
|
Thickness of substrate portion and cylindrical protruding portion
(mm) |
Shape of substrate portion |
Ribs in hollow interior portion of cylindrical protruding portion |
Ribbed channel along cylindrical protruding portion |
Amount of deformation |
Comp. Ex. 1 |
1.0 |
Rectangular |
Absent |
Absent |
2.2 |
Comp. Ex. 2 |
1.0 |
Four corner-cut rectangular |
Absent |
Present |
1.8 |
Comp. Ex. 3 |
1.0 |
Four corner-cut rectangular |
Present |
Absent |
1.3 |
Example 1 |
1.0 |
Four corner-cut rectangular |
Present |
Present |
1.1 |
Reference Example |
2.0 to 2.5 |
Rectangular |
Absent |
Absent |
1.0 |
[0036] The recording material package of Example 1 gave the same amount of deformation as
that of Reference Example in which the thickness was 2.0 to 2.5 mm.
[0037] Furthermore, a recording material package was made by inserting the cylindrical protruding
portion of the above-mentioned roll support member into each of opposite ends of the
core of a recording material roll and housing it in a pulp-made packaging material.
This package was subjected to a drop test in accordance with JIS Z 0202, and the resistance
of the roll support member to the drop impact was examined. The recording material
package of Example 1 exhibited higher resistance to the drop impact than did the recording
material packages of Comparative Examples 1 to 3, and had the same strength as that
of Reference Example in which the thickness was 2.0 to 2.5 mm.
1. A roll support member comprising:
a four corner-cut rectangular substrate portion (4);
a cylindrical protruding portion (5) that is formed integrally with the substrate
portion (4) in the center of the surface on one side of the substrate portion (4)
and has the extremity thereof closed; and
projecting portions (6) that are formed integrally with the substrate portion (4)
so as to extend from each of four corners of the substrate portion (4) in the direction
in which the cylindrical protruding portion (5) is formed; wherein
the substrate portion (4) has ribs (4a, 4b) formed on the surfaces of both sides thereof;
the cylindrical protruding portion (5) has a hollow interior portion formed therein;
the hollow interior portion has a rib (5a) disposed in a cylindrical shape that is
substantially concentric with the cylindrical protruding portion (5), and a radial
rib (5b) disposed so as to provide a connection between the concentric cylindrical
rib (5a) and the surface on the hollow interior portion side of the cylindrical protruding
portion (5);
the side of the substrate portion (4) on which the cylindrical protruding portion
(5) is formed is provided with a U-shaped channel (8) in a section where the cylindrical
protruding portion (5) and the substrate portion (4) intersect, the channel (8) surrounding
the base of the cylindrical protruding portion (5); and
the channel (8) has a rib (8a) therewithin, the rib (8a) being disposed in a radial
manner with the cylindrical protruding portion (5) as the center.
2. The roll support member according to Claim 1, wherein the projecting portions (6)
are provided so as to extend outward relative to the outer periphery of the substrate
portion (4), and the projecting portions (6) have a rib (6a) on the inner side thereof.
3. The roll support member according to either Claim 1 or Claim 2, wherein the reverse
surface (8b) of the bottom of the channel (8) has no rib.
4. The roll support member according to any one of Claims 1 to 3, wherein the substrate
portion (4) has an outer peripheral portion between the outer periphery of the channel
(8) and the outer edge of the substrate portion (4), and the outer peripheral portion
has on both sides a plurality of radially disposed ribs (4a, 4b).
5. The roll support member according to any one of Claims 1 to 4, wherein the rectangular
shape is a square having sides of 120 to 190 mm, and the cylindrical protruding portion
(5) has a height of 10 to 40 mm.
6. The roll support member according to any one of Claims 1 to 5, wherein the projecting
portions (6) have an identical height and are no shorter than the height of the cylindrical
protruding portion (5).
7. The roll support member according to any one of Claims 1 to 6, wherein the side of
the substrate portion (4) opposite to the side where the cylindrical protruding portion
(5) is formed is provided with a depression for holding a roll-form recording material.
8. The roll support member according to any one of Claims 1 to 7, wherein in order to
stack at least two roll support members, the projecting portion (6) has a step (6b)
provided at the extremity thereof, or the substrate portion (4) has a notch (4c) provided
therein.
9. The roll support member according to any one of Claims 1 to 8, wherein the roll support
member is made of a block copolymer of polyethylene and polypropylene.
10. A recording material package in which a roll-form recording material (1) is suspended
and supported by the roll support member according to any one of Claims 1 to 9 and
housed in a rectangular parallelepiped housing (7).