JP2008184333A - Roll bearing device, and roll unit using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roll bearing device, that is light and tough, low in water absorption, has no risk of decay, is easy to wash when dirty, is excellent in shock absorbing performance, has no anisotropy in strength, costs less in facility investment when compared with injection molding, and totally and sufficiently meets performance requirements as a bearing device, and a roll unit using the same. <P>SOLUTION: The roll bearing device 12 to be provided on each side of the roll 1 for bearing each end part of a center core 2 for supporting the roll 1 in a hanging state is formed of expanded polyolefin. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is suitable for transporting a long belt-like object such as a sheet or a film, or a long string-like object such as a thread or a rope wound in a roll shape, a coil shape, a bobbin shape, a cheese shape, or the like. The present invention relates to a scroll receiver and a scroll unit using the same.

  Long strips such as sheets and films, and long strings such as threads and ropes are made of paper, metal or synthetic resin so that they are not bulky during transportation or storage. It is handled as a scroll wound around the core in a roll shape, coil shape, bobbin shape, cheese shape, or the like.

  Further, as a method for transporting the scroll, a method of transporting the scroll in a horizontal direction is widely adopted. Specifically, the product part of the scroll is placed on a pallet rug or padding and transported, and the product part of the scroll is supported on the suspended state by receiving both ends of the core so that it does not touch the ground. And a method of transporting it (see, for example, Patent Document 1).

  In the former method, the bottom of the product part of the scroll is placed directly on the rug or the pad, or only the bottoms of both ends of the product part of the scroll are placed on the pad. There is a problem that fine dust or dust easily adheres to the contact portion of the product part of the scroll, and the product part of the scroll is easily damaged by vibration or swinging during transportation or transportation. Further, even when a scroll is placed on a pallet and stacked in multiple stages, there is a problem in that the contact portion is damaged because the scroll is in direct contact with the upper pallet.

  When the scroll is supported by the latter method, as shown in FIG. 8, one side is made of a substantially square plate-like member having a size larger than the diameter of the scroll, and a circular support hole 101 is formed at the center. A pair of receptacles 100 is used to support the scroll 103 in the form of a scroll unit 102 shown in FIG. Specifically, the receiver 100 is arranged on both sides of the scroll 103, and the sheet member 104 is interposed between the receiver 100 and the scroll 103, and both ends of the core of the scroll 103 are directly or directly connected to the connector (paper). (Or made of metal or synthetic resin) 106 and received by the support hole 101 of both receivers 100, the scroll 103 is supported in a suspended state between the receivers 100, and a binding band 107 is wound around both receivers 100. The scroll 103 is fixedly supported by the receiving tools 100 arranged on both sides thereof. Further, when stacking the scroll unit 102 on the pallet 108, the plate-like member 109 is fixed on both the upper and lower sides of the scroll unit 102 between both the receivers 100, and the scroll is disposed between the scroll unit 102 and the pallet 108 and above and below. The frictional resistance between the units 102 is increased so that the scroll unit 102 is not displaced due to vibration during transportation or transportation. Further, as the sheet member 104, a low foam extruded sheet such as polypropylene is used to prevent damage to both ends of the scroll 103 due to contact with the receiving device 100, and to sufficiently secure the holding property of the scroll 103 by both receiving devices 100. Or cardboard punched items.

  In this method, since the product portion of the scroll does not contact the rug or the pad, damage to the product portion due to contact with the rug or the pad can be reliably prevented as in the former method. In addition, even when a plurality of scrolls are stacked, as shown in FIG. 9, the product unit is placed on the upper side by stacking a plurality of unit sets with the scroll unit 102 having plate members 109 fixed on the upper and lower sides as a unit set. This has the advantage that the scrolls can be stacked without touching the pallet.

Japanese Utility Model Publication No. 2-4061

  By the way, as the receiving tools currently used, wood-based cutting products are the main products, and there are plastic injection molded products, cardboard processed products, iron processed products, etc., but each has the following drawbacks. ing.

  Wood-based cut products are made of wood-based materials such as wood, plywood, particle board, OSB (Oriented Strand Board), fiberboard, and some common disadvantages of these wood-cut products are listed below. First, the wood-based receiver is easy to absorb moisture, and mold grows and contaminates the scroll with nutrients such as sugar contained in the wood. In particular, when a food film is wound, it becomes a problem in terms of hygiene. Secondly, even if it becomes dirty with dust or dust, it needs to be wiped off, and if it is washed with water, it absorbs moisture and must be dried, making its management complicated. Thirdly, when used for a long period of time, there is a drawback in that wood chips and flakes are generated from scratches and cracks and the scroll is damaged. Fourthly, since repeated use of moisture absorption and drying and applying load, deformation, dimensional shrinkage and cracking occur, and eventually decay, so that the frequency of repeated use cannot be expected too much. Fifth, if the size of the scroll is large, the receiving plate becomes large and heavy, and workability is poor. Sixth, wood has anisotropy in compressive strength and is known to have a compressive proportional limit stress of about 100: 10: 5 in the fiber direction, radial direction, and tangential direction. Then it is a troublesome material. Seventh, wood systems have a slenderness ratio (ratio of the length under load and the dimension of the minimum secondary radius of the cross section) that exceeds 30, so a buckling phenomenon occurs rapidly, so a simple load-bearing design (pressure-receiving area x unit compression) The strength is not solved, and the thickness must be increased more than necessary to prevent buckling. As a result, the load becomes heavy, and the design load bearing performance is excessive. Eighth, hard materials such as wood do not have the property of relieving small displacements such as vibrations within elastic deformation, so that vibrations from the outside are easily transmitted directly to the scroll during truck transportation. Further, when excessive stress is applied, it is deformed and does not recover. Ninthly, the material unit price is relatively inexpensive, but the machining cost is high because the inner surface of the support hole or the surface of the receiving tool must be smoothed with high accuracy. Tenth, if the scroll has a large diameter, the support must be increased in size and thickness, but there is a limit in the woody system. Eleventh, the use of wood also leads to depletion of forest resources from the viewpoint of global environmental conservation. Twelfth, in order to improve the holdability of the scroll or to prevent damage to both ends of the scroll due to contact with the receiver, it is necessary to arrange a sheet member between the scroll and the receiver, and the number of parts in the case of a scroll unit Will increase. Moreover, when stacking on a pallet, it is necessary to arrange plate-like members on both the top and bottom sides of the scroll unit in order to prevent misalignment during transport and transport, which further increases the number of parts, There are disadvantages such as complicated handling.

  Wood-based receivers have been used for a long time, but as an alternative material, receivers made of plastic injection molded products have begun to be used recently. The commercially available receiver is made of an injection molded product made of ABS resin or polypropylene, and a flat surface 111 is formed on the surface on the scroll side as in the receiver 110 shown in FIG. The reinforcing rib 112 is formed to form a rib structure that steals the meat, the cylindrical portion 113 formed by reinforcing the reinforcing rib 112 at the central portion is formed, and a support hole for supporting the scroll in the cylindrical portion 113 What formed 114 is widely used. 10B, a flat surface 121 is formed on the surface on the scroll side, a reinforcing rib 122 is formed on the opposite surface, and extends upward from the central portion of the receiver 120. A pair of long and narrow support holes 123 with their upper ends open are formed with a space left and right so that two scrolls can be held between parallel receiving members 120. It has been adopted.

  There are some drawbacks to plastic injection molded products. To list, first, the rib structure was thought to reduce the cost by reducing the weight and reducing the materials used, but the current one is still heavy. It is not enough from the viewpoint of workability. Secondly, in the rib structure, the load bearing strength of the pressure receiving portions above and below the receiving member is different in the thickness direction. That is, the scroll side is strong and the opposite side is weak. Thirdly, the rib structure is often used without being noticed that the blind spots are not sufficiently removed due to the formation of blind spots during cleaning by brushing or the like. Fourthly, since the weight of the receiver cannot be reduced any more, and the injection molding product is expensive in the mold manufacturing cost, the plastic receiver is very expensive.

  Corrugated cardboard receptacles have poor durability and can only be used for lightweight scrolls. Further, when used for a long time, dirt such as corrugated cardboard debris and dust tends to adhere to the surface of a scroll such as a film. Corrugated cardboard has low mechanical strength such as compression and bending. Therefore, when stacking using pallets, it is strong if it is formed into a shape similar to that of current wooden cutting products and plastic injection molded products. It is impossible. In addition, since it is inferior in cushioning performance, it is difficult to return to the original if it is deformed even with a small displacement.

  To support large-diameter scrolls, wooden materials are not strong enough, and it is difficult to obtain continuous wood-based thick plates. Therefore, steel plates with support holes formed on steel plates are used. ing. However, the processed iron products have problems such as the weight of the support becomes heavy and the film is rusted to contaminate the film. Further, since it is a rigid body, no buffering effect can be expected.

  The present applicant also examined the application of a high density product of beaded polystyrene foam produced by the bead method to a receiving device, but there are problems such as a buffer effect but insufficient durability. I couldn't make anything that could withstand.

  Wood-based materials generate little static electricity, but plastic materials can become charged and attract dust and dirt, which can contaminate the scroll.

  As a result of intensive studies to solve the above problems, the present inventors have found that the above problems can be greatly improved by applying a high density product of bead method foamed polyolefin, and have completed the present invention.

  That is, the scroll receiver according to the present invention is a scroll receiver that receives both ends of the center core on both sides of the scroll and supports the scroll in a suspended state, and is formed of a beaded polyolefin. According to the present invention, various disadvantages of the conventional support made of wood, plastic, cardboard, and iron are solved. Taking a high-density foamed polypropylene holder as an example, it is lightweight and durable, has low water absorption, does not worry about decay, is easy to clean dirt, has no anisotropy in strength, and has excellent buffering performance. It has been found that the required performance of the receiver is comprehensively and sufficiently satisfied with less capital investment compared to injection molding.

  The bead method is typified by a manufacturing method of bead method expanded polystyrene, but pre-expanded particulate pre-expanded particles are filled into a mold of a predetermined shape, heated and expanded for the second time. This is a foam manufacturing method in which particles are fused together without spaces, and cooled to obtain a molded product according to the shape of the mold. Usually, pressurized steam is used as the heating medium.

  Here, the beaded polyolefin is a high-density foamed polypropylene, and the density is preferably 60 to 300 g / L, and preferably 90 to 180 g / L. Examples of the polyolefin include polypropylene, high-density polyethylene, medium-density polyethylene, low-density polyethylene, and ethylene-vinyl acetate copolymer. Among them, polypropylene that is superior in strength and thermal dimensional change to polyethylene is preferable. Such a high-density foamed polypropylene bead molding technique was considered difficult to achieve, but was realized by the present applicant one or two years ago. However, the term “polypropylene” as used herein means not only a single polypropylene but also a copolymer obtained by copolymerizing a small amount (1 to 5%) of ethylene or butene for improving moldability.

  In addition, the total weight of the scroll varies, but taking a film roll as an example, the heavy one is several tens of kilograms to several tons, and the first required performance of the receiver is sufficient load bearing performance. . Therefore, in low density foamed polypropylene with low load resistance, in order to withstand the weight of heavy scrolls, the thickness must be increased significantly, and durability such as surface strength drops and chipping occurs. Will occur. In addition, if extremely high-density foamed polypropylene is used, the same problems as in the woody system occur. That is, the load-bearing performance is excessively necessary, and the thickness must be reduced due to the cost. This increases the slenderness ratio and causes buckling. From such a viewpoint, the density range of the high-density foamed polypropylene is preferably 60 to 300 g / L.

  It is preferable to set the slenderness ratio of the receiver to 50 or less. If the slenderness ratio of the receiver exceeds 50, the thickness of the receiver is insufficient, the load receiving area is reduced, and the receiver is likely to buckle in the middle due to the load of the scroll, so the slenderness ratio is set to 50 or less. It is preferable to do.

  An antistatic treatment may be applied to the beaded polyolefin foam. In this case, the dust can be prevented from adhering to the holder due to static electricity, and as a result, contamination of the scroll can be prevented.

  The scroll unit according to the present invention includes a scroll formed by winding a belt-like object or a string-like object around a core, and a scroll receiver according to any one of claims 1 to 4 disposed on both sides of the scroll. A pair of scroll holders that receive the core of the scroll and support the scroll in a suspended state, and a binding band that is wound around both receivers and integrally binds the scroll and the scroll receivers. It is equipped with.

  In this scroll unit, it is handled as it is or covered with a dust-proof film and placed on a pallet or packed in a cardboard or wooden box. Since it is made of process foamed polyolefin and the contact surface with the scroll can be easily formed into a flat surface, it is possible to prevent damage to both ends of the scroll due to the contact of the scroll with the receiver and to hold the scroll with both receivers. Can be sufficiently secured, and the scroll can be held with good stability without arranging a low foam extruded sheet or a sheet member made of a cardboard punched product as in the case of a wooden support. In addition, since the buffer is imparted to the receiver, vibrations during transportation and transportation can be absorbed by both receivers. For this reason, even if this scroll unit is installed directly on a pallet and transported or transported, it is possible to prevent a problem that the scroll unit is misaligned due to vibration during transport or transport. The scroll can be supported with good stability without arranging plate-like members on the top and bottom.

  According to the scroll holder according to the present invention, it is lightweight and has good workability, and unlike wood-based materials, there is no hygroscopicity, so there is almost no generation of mold, and there is no cracking or saglet, so there is no worry about sticking of wood chips, Since there is no risk of deformation or decay, the number of uses is increased, and there is no risk of cleaning leakage due to the rib structure like plastic injection molded products. can do.

  Here, when the polyolefin foamed bead method is a high-density foamed polypropylene and the density is set to 60 to 300 g / L, preferably 90 to 180 g / L, the strength and stability against thermal dimensional change are excellent. In addition, it is possible to suppress an increase in manufacturing cost and weight, and it is possible to realize a receiving material excellent in load bearing performance.

  When the slenderness ratio of the receiver is set to 50 or less, the thickness of the receiver can be set large so that a sufficient load receiving area can be secured, and the receiver can be reliably prevented from buckling in the middle due to the load of the scroll. .

  When antistatic treatment is applied to the beaded foamed polyolefin, adhesion of dust due to static electricity to the holder can be suppressed, and as a result, contamination of the scroll can be prevented.

  According to the scroll unit according to the present invention, since the receiver itself is made of a beaded foamed polyolefin having a buffer property, damage to both ends of the scroll due to contact with the receiver can be prevented, and Sufficient holdability can be secured, and the scroll can be held with good stability while reducing the number of parts. In addition, vibrations during transportation and transportation can be absorbed by both receivers, so that the scroll can be stably supported without increasing the number of parts. In addition, since the number of parts is small, handling of the scroll can be remarkably improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1-3, the scroll 1 is handled as the scroll unit 10 of the following structures, in order to improve the handleability at the time of the transportation, conveyance, etc. That is, the plate-like receptacles 12 are arranged on both sides of the scroll 1, and the coupling fixtures 14 are fitted and mounted over the support holes 13 of the receptacles 12 and both ends of the core 2 of the scroll 1, respectively. The binding band 15 is wound around the middle part of the tool 12 and is handled as a scroll unit 10 formed by integrating these members. Then, as shown in FIG. 4, such a scroll unit 10 is placed on a pallet 20, and is stacked and stored or transported in a plurality of stages. It will be stored in a wooden box or transported. However, when the scroll unit 10 is packed in a cardboard box, a wooden box, or the like, the binding band 15 may be omitted.

  The scroll 1 is a hollow pipe-shaped core 2 made of paper, metal, or synthetic resin, a long belt-like object such as a sheet or film as the product part 3, or a long string such as a thread or rope. The product is wound into a roll shape, a coil shape, a bobbin shape, a cheese shape, or the like.

  The connector 14 includes a cylindrical tube portion 14a and a flange portion 14b formed at one end thereof, and is integrally formed of a metal material or a synthetic resin material. It is comprised so that the edge part of the core 2 can be supported with respect to the receiving tool 12 by carrying out internal fitting mounting | wearing over both ends. However, as the connection tool 14, any structure can be adopted as long as it can support the core 2 with respect to the support 12. Further, for example, both ends of the core 2 of the scroll 1 protrude from the product part 3 of the scroll 1 to both sides, and the ends of the core 2 are directly attached to the support holes 13 to receive the core 2. When directly supporting by the tool 12, the connecting tool 14 can be omitted.

  The binding band 15 is composed of a band member made of tough synthetic resin such as polypropylene or PET (polyethylene terephthalate), or a band member made of iron or paper, and both ends thereof can be directly bonded by fusion or the like. None or can be indirectly coupled using a binding tool (not shown). As shown in FIG. 2, the binding band 15 is attached by a method of winding one binding band 15 around the intermediate portion in the height direction across the two supports 12, or two as shown in FIG. 5. A method of winding the binding band 15A through the center core 2 and winding it around the intermediate portion over both the receivers 12 can be exemplified. However, other attaching methods may be used.

  The receiver 12 is composed of a plate-like member made of a polyolefin resin molded by a bead method, and is formed in a substantially square shape such as a square shape or a rectangular shape as shown in FIGS. 1 to 3 and FIG. A support hole 13 in which the cylindrical portion 14a of the connector 14 is mounted is formed in the central portion. The distance from the center of the support hole 13 to each side of the support 12 is set to be larger than the diameter of the product portion 3 of the scroll 1, and as shown in FIG. 4, with the scroll unit 10 set on the pallet 20, The product part 3 of the scroll 1 is configured so as not to contact the pallet 20 and the product parts 3 of the adjacent scrolls 1 do not contact each other. The thickness of the receiver 12 is appropriately set according to the weight of the scroll 1 or the like.

  The receiving member 12 can have any shape or configuration as long as it can receive and support the both ends of the core 2 to suspend and support the scroll 1 in a suspended state and the surface of the scroll 1 is a flat surface. For example, as shown in FIG. 6B, instead of the support hole 13, a long and narrow support hole 13A elongated in the vertical direction with the upper end opened may be used. A formed one may be employed, or a support hole 13B that is elongated in the vertical direction with the upper end open, as shown in FIG. A portion formed with a keyhole-shaped support hole 13B having a diameter larger than the width of the upper passage portion may be employed, or as shown in FIG. A plurality of support holes 13 are formed at intervals, and a plurality of windings are formed between a pair of support members 12 arranged in parallel. 1 may be employed which is constructed so as to be supported.

  Specific materials for the receiver 12 include polypropylene, high-density polyethylene, medium-density polyethylene, low-density polyethylene, ethylene-vinyl acetate copolymer, and the like. Among them, strength and thermal dimensional change are superior to those of polyethylene. Polypropylene is preferred. However, the term “polypropylene” as used herein includes those obtained by copolymerizing a small amount (1 to 5%) of ethylene or butene for improving moldability.

  When the density of the foamed polypropylene exceeds 300 g / L, the load bearing performance increases, but it becomes expensive, and when the density is less than 60 g / L, the load bearing performance is greatly lowered and is not suitable as the receiver 12. , Preferably, it will be set to 90-180 g / L. By setting in this way, it is possible to realize a receiving material excellent in load bearing performance while suppressing an increase in manufacturing cost and weight of the receiving tool 12.

  You may perform an antistatic process in the manufacture process of the receiver 12. FIG. Specifically, the antistatic agent is melted and kneaded at the manufacturing stage of unexpanded particles (called mini-pellets, which are obtained by cutting a string-like melt-extruded product into strips), which is the first step in the manufacturing process of the bead-processed polyolefin. The antistatic agent is caused to adhere to the surface of the receiver 12 molded in the final step by a method such as dipping. If comprised in this way, antistatic performance will be provided to the holder 12, the adhesion of the dust by the static electricity with respect to the holder 12 will be suppressed, and the contamination to the scroll 1 can be prevented as a result. As the antistatic agent, fatty acid amides, fatty acid esters, alkyl sulfonic acids, and the like can be suitably used.

  In addition, a sheet member made of a low-foam extruded sheet such as polypropylene or a cardboard punched product is disposed between the product portion 3 of the scroll 1 and the support 12 to further reduce the frictional resistance, or to contaminate the support 12. May be prevented from adhering to the product portion 3.

  As described above, the characteristic feature of the present invention is that the receiving member 12 is made of a beaded foamed polyolefin. Table 1 summarizes the performance of the receiver 12 made of beaded expanded polypropylene and the receiver made of a wood-based cut processed product, plastic injection molded product, cardboard processed product, iron processed product, and beaded expanded polystyrene. . However, in Table 1, .largecircle..DELTA..DELTA.x is a performance evaluation mark, .largecircle. Represents a very good evaluation, .largecircle. Represents a good evaluation, .DELTA.

  From Table 1, beaded foamed polypropylene has the load-bearing performance, lightness, moisture absorption, decay, dust source, static electricity, cleanability, repeated use, buffer performance, deformation recovery, strength required for the receiving device. It can be seen that it exhibits excellent performance in various performances such as anisotropy and cost.

Next, the density of the expanded polypropylene will be examined.
FIG. 7 shows the unit compressive strength (at the time of 5% strain) of a bead-method foamed polypropylene having a density of 60 to 300 g / L. The unit compressive strength when the density is 60 to 300 g / L is generally about 0. It is in the range of 245 to 4.116 MPa. The unit compressive strength when the density is 90 to 180 g / L is generally in the range of 0.4312 to 1.5288 MPa. Such a unit compressive strength is so low as to be incomparable with the unit compressive strength of current wood-based receivers, and is less than 1/10 of the unit compressive strength in the fiber direction of wood. However, wood-based receivers must be thickened due to fear of buckling, so the load-bearing design has become a safety design that is several tens of times the required pressure-resistant load. Because it is 1/2 to 1/10 lighter than wood-based materials, it is still lightweight even if its thickness is set to several times that of current wood-based receivers. Therefore, if the thickness of the foamed polypropylene holder is increased within a range that maintains the lightness, and the load resistance is increased by this, an appropriate load resistance performance can be obtained.

  In order to verify this, the weight and load resistance were theoretically calculated for woody-type receivers and foamed-polypropylene receivers having the following sizes. In addition, since the buckling of wood greatly depends on the slenderness ratio, the slenderness ratios of the wood-based support and the foamed polypropylene support were determined by the following formulas, respectively. Table 2 summarizes the results. However, the load resistance was determined on the condition that the scroll is supported by the two receivers.

  As a wood-based support, a pine with a height of 670 mm, a width of 670 mm, a thickness of 30 mm, and a support hole diameter of 150 mm is used. As a support made of polypropylene foam, as shown in FIG. In addition, the thickness was set to 60 mm, and the other sizes were set to the same size as the wooden base.

(Elongation ratio)
Elongation ratio = Buckling length / Minimum cross-section secondary radius Minimum cross-section secondary radius = Short side length of pressure-receiving cross section / 3.46

  As shown in Table 2, with regard to the pressure load, the current wooden support is 112.6 tons, the expanded polypropylene support is 6.8 tons, and the expanded polypropylene support is Although it is 1/16 or less of the system support, as mentioned above, the load resistance of the wooden support is designed to be safe enough to be several tens of times the required pressure resistance load. Sufficient load bearing performance can be obtained. In addition, since the foamed polypropylene holder having such a thickness can be set to about half the weight of the wood-type receiver, it can be seen that the weight can be halved while sufficiently securing the load bearing performance. Moreover, since the slenderness ratio of the wood-based receiver is 77.3 and is included in the buckling region 50 to 100, it is desired to increase the thickness to improve the slenderness ratio, but the weight of the receiver becomes heavy. Therefore, the current situation is that such a configuration is not possible. On the other hand, since the holder made of foamed polypropylene has a slenderness ratio of 38.6 and smaller than 50, buckling of the holder is prevented.

  As described above, if the slenderness ratio of the receiver exceeds 50, the occurrence of buckling is a concern, so it is preferably set to 50 or less. It is also possible to set the slenderness ratio to less than 10. However, in this case, it is considered that the receiver becomes too thick and a problem arises in terms of space. It will be set to 10-50.

Next, an example of how to select the density of high-density polypropylene that was suitably used as a receiver was carried out by calculation.
<Prerequisites>
(1) The load of the scroll is supported without permanent deformation of the tool.
(2) Number of stacks during warehouse storage: 6 levels (upload is 5 levels) * 1
(3) Elongation ratio: 40
(4) Load-bearing safety factor: 4 times * 1: Although the number of stacks is set to 6 this time, the following calculation method can also be applied to cases where the number of steps is to be increased or decreased.

  As shown in Table 3, three types of size holders are used, and the case 1 case is assumed to have a case where a roll having a diameter of about 45 cm and weights of 50 kg, 100 kg, and 300 kg is supported. As for the receiver of No. 2, assuming a case where a roll having a diameter of about 60 cm and a weight of 100 kg, 300 kg, 500 kg, and 1000 kg is installed and supported, the case 3 has a diameter of about 90 cm and a weight of 1000 kg. Assuming the case where 2000 kg and 3000 kg rolls were respectively installed and supported, the total load including the safety factor, the unit compressive strength, and the density were determined so as to satisfy the preconditions. Table 4 summarizes the results.

  As can be seen from Table 4, by using a foamed polypropylene having a density of 60 to 300 g / L, for example, a 50 kg to 3000 kg scroll frequently used as a roll wound with a film can be supported without difficulty, and such a density range. If so, since the slenderness ratio can be set to around 40, it is possible to prevent buckling of the receiver and to prevent the receiver from becoming thicker than necessary.

Next, a vibration evaluation test performed on the scroll unit will be described.
As a scroll, a roll having a total weight of 360 kg formed by winding a reflective film around a hollow pipe-shaped core was used.

(Example)
As the receiver, a receiver 12 having the shape and size shown in FIG. The density of the foamed polypropylene used was 112 g / L. The average weight of the receiver 12 was 2.9 kg. As the coupling tool, a tube having a length of 120 mm was used. As the binding band, a polypropylene binding band was used.
Then, three types of scroll units were manufactured: the bundling method shown in FIGS. 2 and 5 and the bundling method in which the bundling band was wound around both the receivers on the upper side and the lower side of the coupler.

(Comparative example)
Instead of the receiver in the embodiment, a receiver made of red pine having a thickness of 30 mm and other sizes set to the same size as the receiver of the embodiment is manufactured, and a polypropylene is formed between the product portion of the scroll and the receiver. A sheet member made of a low-foam extruded sheet made from the sheet was arranged, and a scroll unit was manufactured by binding in the same binding method as the roll unit of the above example.

  And as a result of searching the resonance frequency by changing the frequency range continuously from 5 to 55 Hz by the method A-1 (logarithmic sweep) of the vibration test method for packaged cargo specified in JIS Z 0232, 16 Hz was obtained for vibration, and 6 Hz was obtained for longitudinal vibration (in the roll axis direction). Next, in Method B-1, vibrations of 10 minutes (equivalent to 2000 km travel) were applied at the respective resonance frequencies for both the vertical and longitudinal vibrations.

As a result, in the example, for any of the scroll units bound by the three types of binding methods, the winding unit did not jump up or the installation position was not shifted, and the receiver was not deformed or damaged. In addition, the impact absorbing performance of the receiver was exhibited and the vibration width of the roll was suppressed, so that the roll could be stably fixed and held. On the other hand, in the comparative example, the scroll unit jumped up and the scroll slightly rotated, and the scroll could not be stably fixed and held.
Moreover, in the Example, since the scroll can be stably fixed and held with respect to any scroll unit bound by any binding method, it can be seen that the simplest binding method shown in FIG. 2 can be suitably employed.

The disassembled perspective view of the scroll unit using the holder which concerns on this invention Perspective view of the scroll unit Vertical section of the scroll unit Explanatory drawing of the method of transporting the scroll unit Explanatory drawing of other bundling methods of the scroll unit (A)-(d) is a perspective view of the receptacle which concerns on this invention, respectively. Diagram showing the relationship between density and unit compressive strength of beaded foamed polypropylene Perspective view of a conventional wood-based receiving device Explanatory drawing of the conveyance method of the scroll unit using the same holder (A), (b) is a perspective view of a receiver made of a plastic injection molded product according to the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Scroll 2 Medium core 3 Product part 10 Scroll unit 12 Receptacle 13 Support hole 14 Connection tool 14a Tube part 14b Flange part 15 Binding band 12A Receptacle 13A Support hole 12B Receptacle 13B Support hole 12C Receptacle 15A Binding band 20 Pallet

Claims (5)

  A scroll receiver that receives both ends of the core on both sides of the scroll and supports the scroll in a suspended state, and is formed of a beaded polyolefin.   The roll receiver according to claim 1, wherein the beaded polyolefin is a high-density foamed polypropylene having a density of 60 to 300 g / L.   The scroll receiver according to claim 1 or 2, wherein a slenderness ratio of the receiver is set to 50 or less.   The scroll receiver according to any one of claims 1 to 3, wherein an antistatic treatment is applied to the beaded foamed polyolefin. A scroll formed by winding a band or string around the core;
The scroll receiver according to any one of claims 1 to 4, which is disposed on both sides of the scroll, and receives a center of the scroll to support the scroll in a suspended state.
A binding band that is wound around both receivers and integrally binds the scroll and both scroll receivers;
A scroll unit characterized by comprising:

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