JP5365902B2 - Roll receiver made of styrene resin foam plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roll receiver for supporting a roll with a plastic film, a sheet, a cloth or the like being wound around a core, formed of a lightweight, easy-to-handle and inexpensive polystyrene foam, and having a load resistance performance superior to a roll receiver formed of a polystyrene foam obtained by the bead method. <P>SOLUTION: The roll receiver formed of a styrene resin foam board manufactured by an extrusion foaming method demonstrates the superior load resistance performance when it is used with its direction parallel to the extrusion direction in the extrusion foaming method being set to the direction for supporting the roll load. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a roll receiver that suspends and supports a roll formed by winding a sheet or a film. In particular, the present invention relates to a roll receiver made of a styrene resin foam plate having improved load bearing performance.

  Since long strips such as sheets and films are bulky, they are often handled as rolls wound around a tubular core such as paper, resin, FRP, or metal. Such roll transport and storage methods include a method of placing the roll on a backing material laid on a pallet, and a pair of roll receivers having openings disposed on both sides of the roll, and both ends of the core of the roll. A method of receiving the portion and suspending and supporting the roll is widely adopted.

  In the latter method, since the roll is suspended in the air, the entire load of the roll is applied to the pair of roll receivers. Therefore, the roll holder is required to have load bearing performance and seismic performance during transportation of trucks and freight cars.

  As shown in FIGS. 1 and 2, a typical roll receiver 1 includes a square plate-like member 2 having a size larger than the diameter of the roll, and a round opening that is provided at a substantially central portion and receives a roll load. 3. The roll 10 includes a material to be wound 11 such as a resin film wound around a core 12. The end of the core 12 protrudes from the wound material 11 and is fitted into the opening of the roll receiver 1, and the roll 10 is suspended and supported by the roll receiver 1.

  Wood materials such as wood and plywood have been used most widely as raw materials for plate-like members, and metal materials such as cast iron and aluminum are generally used for heavy rolls. In recent years, plastics such as ABS resin, polypropylene resin, and high-impact polystyrene (HIPS), which have a rib structure on the back and have been reduced in weight, have come into wide use.

  In order to ensure the load bearing performance and earthquake resistance of the roll holder, generally, a hard and strong material is selected for the plate-like member, but the roll holder itself is heavy and the workability is poor. There is a problem of becoming. In addition, in woody systems, it is easy to absorb moisture, and there is a problem that leads to contamination of the roll, such as rot and tree sticking as garbage. In addition, wood systems tend not to be adopted in the future from the viewpoint of protecting the natural environment. Metal systems have problems of being too heavy and rusting and contaminating the roll.

  Patent Document 1 discloses a receiver using plastic. Although this receiver is designed to reduce the weight by making the back surface of a substantially square plate-like member a rib structure, it is still heavy to handle manually and places a heavy burden on the operator. In addition, there is a problem that the neck of the protruding part of the plastic holder is susceptible to cracking due to drop impact or transportation vibration, and the number of reuses is reduced. There are problems such as being easy to accumulate and difficult to clean.

  Patent Document 2 discloses a support member using a foam for supporting a ring-shaped article such as a magnetic tape roll. Patent Document 2 discloses polypropylene foam, polyethylene foam, and polystyrene foam as foams. However, as suggested from FIG. 6 of Patent Document 2, this support member is used for an article that is light enough to be lifted by hand. Patent Document 2, page 2, upper left column, lines 8 to 11 describes a method for producing a support member using expanded polystyrene. This production method uses a production method called a bead method.

  Patent Document 3, column 1, lines 20 to 25 discloses that a polystyrene foam panel bonded to a wooden sheet is usually used as a support for a roll of 2000 pounds (about 900 kg) or more. However, in the same part of Patent Document 3, it is described that the expanded polystyrene panel itself cannot support the weight of the roll, and it is considered that the expanded polystyrene panel is merely used as a buffer material. There is no disclosure about the manufacturing method of a polystyrene foam panel.

  Patent Document 4 discloses a roll receiver using a foam that can be used for a heavy roll, and discloses that a beaded foamed polyolefin is preferable as the foam. Table 1 of Patent Document 4 also discloses a roll receiver using a beaded polystyrene foam, and this roll receiver may be inferior in deformation recovery force or the like, but has a load bearing performance that can be used for the roll receiver. It is disclosed to have. Similarly to Patent Document 4, Patent Document 5 discloses a roll receiver using beaded expanded polystyrene in Table 1.

The most commonly used wooden roll holder as a roll holder is inexpensive, but it is heavy and has thorns on its surface. For this reason, when handling a wooden roll holder by hand, it may be difficult to move, and there is a possibility of being injured by thorns. On the other hand, a roll receiver made of a resin foam is lightweight and easy to handle, and there is no possibility of injury. However, since the roll receiver made of a resin foam is a foam, the load bearing performance is inferior to that of wood.
JP-A-6-127838 Japanese Patent Laid-Open No. 1-133875 US Pat. No. 6,805,239 JP 2003-206072 A JP 2004-142808 A

  Among the resin foams, polystyrene foam is the cheapest foam. However, when polystyrene foam is also used for the roll holder, the load bearing performance is inferior to that of the wooden roll holder, and further improvement of the load bearing performance is desired. An object of the present invention is to provide a roll receiver using an inexpensive polystyrene foam and having improved load bearing performance.

The present inventor uses not a bead method expanded polystyrene disclosed in Patent Document 2, Patent Document 4 or Patent Document 5, but a foam polystyrene board by an extrusion foam method, which is cheaper than the bead method expanded polystyrene, for the roll holder. It has been found that the load bearing performance is improved. That is, this invention relates to the following roll receiver and its manufacturing method.
(1) A roll receiver made of a styrene resin foam board manufactured by an extrusion foaming method , wherein the direction parallel to the extrusion direction in the extrusion foaming of the styrene resin foam board is a direction that supports the load of the roll. Roll catcher .
( 2 ) The roll receiver according to (1) , wherein only the styrene resin foam board by the extrusion foaming method supports the load of the roll.
( 3 ) The roll receiver according to (1) or (2) , wherein a foam board having a surface skin layer obtained by an extrusion foaming method is used as a plate member of the roll receiver as it is.
( 4 ) The roll receiver according to any one of (1) to (3), wherein the thickness of the styrene resin foam board is 20 to 60 mm.
( 5 ) The roll receiver according to any one of (1) to (4), wherein the density of the styrene resin foam board is 25 to 100 g / L.
( 6 ) A roll receiver manufacturing method using a styrene resin foam board by an extrusion foaming method , wherein a direction parallel to the extrusion direction in the extrusion foaming of the styrene resin foam board is a direction for supporting the load of the roll. A method for manufacturing a roll receiver .

  The roll receiver made of the styrene resin foam board by the extrusion foaming method of the present invention is less expensive and has better load bearing performance than the roll receiver using the bead method expanded polystyrene.

  Methods for producing a styrene resin foam can be broadly classified into a bead method and an extrusion foam method. The bead method is also called an in-mold molding method. First, styrene resin pre-expanded particles are produced, filled in a mold that can be closed but cannot be sealed, heated with high-pressure steam, etc. This is a method for producing a foamed molded article having a shape corresponding to a mold while foaming and fusing the foamed particles together. According to the bead method, since a molded body having a shape corresponding to a mold can be obtained, there is an advantage that a molded body having a complicated shape can be manufactured at once. However, the molded product is expensive due to many processes.

  In the extrusion foaming method, a foaming agent such as a hydrocarbon gas is added to a molten styrene resin under high pressure to produce a mixture of the resin and the foaming agent. As shown in FIG. This is a method for producing a foam by extruding downward and forming it into a desired cross-sectional shape with a molding die 22 or a molding roll 23. According to the extrusion foaming method, only a foam having a simple shape such as a plate-like body or a cylindrical body can be produced, but there is an advantage that an inexpensive foam can be obtained with fewer steps.

  According to the bead method, a roll receiver made of a foam having an opening can be manufactured all at once. As already mentioned, roll holders generally have a simple structure, and roll holders made of foam cut plate-like members of the required dimensions from boards manufactured by extrusion foaming to form openings. It can be easily manufactured just by doing.

  The roll receiver of the present invention uses a foam board manufactured by an inexpensive extrusion foaming method, and the processing from the foam board to the roll receiver only requires the formation of an opening. Therefore, it can be manufactured at a lower cost than a roll receiver manufactured by the bead method. Furthermore, the roll receiver obtained from the foam board manufactured by the extrusion foaming method has an advantage that the load bearing performance is larger than the roll receiver manufactured by the bead method. The reason why the load bearing performance is large is not clear, but it is considered that the extruded board is stretched in the extrusion foaming method. That is, in the extrusion molding method, the extruded foam board tends to be stretched in the extrusion direction. For this reason, the foam board increases the strength in the extrusion direction. On the other hand, in the bead method, the generated foam is not stretched, so there is no increase in strength. Therefore, it is considered that the roll holder using the foam board manufactured by the extrusion foaming method has higher load resistance than the roll receiver using the foam manufactured by the bead method.

  The styrene resin, which is a raw material resin for the foam board used in the roll receiver of the present invention, is a styrene resin such as styrene, methylstyrene, ethylstyrene, isopropylstyrene, dimethylstyrene, bromostyrene, chlorostyrene, vinyltoluene, and vinylxylene. A homopolymer of monomers or a copolymer comprising a combination of two or more monomers, the styrene monomer and divinylbenzene, butadiene, acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, And a copolymer obtained by copolymerizing one or more monomers such as acrylonitrile, maleic anhydride, and itaconic anhydride. Monomers such as acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, maleic anhydride, and itaconic anhydride that are copolymerized with styrenic monomers lower the physical properties of the styrene resin extruded foam produced. An amount not to allow it to be used can be used. Further, the styrene resin used in the present invention is not limited to the homopolymer or copolymer of the styrene monomer, and the homopolymer or copolymer of the styrene monomer and the other single monomer. It may be a blend of a monomer with a homopolymer or a copolymer, and a diene rubber reinforced polystyrene or an acrylic rubber reinforced polystyrene can also be blended. A modified styrene resin obtained by polymerizing a styrene monomer in the presence of a resin such as polyethylene can also be used. In the present invention, among these styrene resins, a polystyrene resin can be particularly preferably used.

  As the styrenic resin, a resin having a melt flow rate (hereinafter referred to as “MFR”) in the range of 0.1 to 50 g / 10 min is preferably used. By using a styrene resin having an MFR in the above range, the discharge amount of the styrene resin composition during extrusion foaming adjustment, the thickness, width, density, closed cell ratio of the obtained styrene resin extruded foam, Alternatively, there is an advantage that the surface property can be easily adjusted. In addition, by using a styrene resin having an MFR in the above range, the appearance of the styrene resin extruded foam is excellent, and the balance of properties such as mechanical strength and toughness expressed by compressive strength, bending strength, and bending deflection is achieved. Becomes better. Further, the MFR of the styrenic resin is more preferably 0.3 to 30 g / 10 minutes, particularly 0.5 to 20 g / 10 minutes, from the viewpoint of the balance of moldability, mechanical strength of the extruded foam, toughness and the like. preferable. In addition, MFR is measured by A method of JISK7210 (1999), and test conditions are set according to a composition of a styrene resin. For example, for polystyrene, it is measured under test condition H.

  Styrenic resins include silica, talc, calcium silicate, wollastonite, kaolin, clay, mica, zinc oxide, titanium oxide, calcium carbonate and other cell nucleating agents, sodium stearate, magnesium stearate, barium stearate , Processing aids such as liquid paraffin, olefin waxes, stearylamide compounds, flame retardants such as hexabromocyclododecane, flame retardant aids, phenolic antioxidants, phosphorus stabilizers, nitrogen stabilizers, sulfur Additives such as stabilizers, light-resistant stabilizers such as benzotriazoles and hindered amines, antistatic agents, colorants such as pigments, and water-absorbing substances may be contained.

  Of these, the amount of the cell nucleating agent used is preferably 0.5 parts by weight or less, more preferably 0.3 parts by weight or less, based on 100 parts by weight of the styrene resin. When the amount of the cell nucleating agent is increased more than necessary, the foam tends to be slightly brittle. If the amount of the cell nucleating agent is too small, a good cell structure tends not to be obtained. Therefore, the amount of the cell nucleating agent is preferably 0.05 parts by weight or more.

  The styrene resin foam board used in the present invention can be produced by a normal extrusion foaming technique. That is, a styrenic resin is heated and melted in an extruder or the like, and a foaming agent is injected into the styrenic resin under a high pressure condition to form a fluidized gel, cooled to a temperature suitable for extrusion foaming, and the fluidized gel is cooled through a die. It is possible to manufacture by extruding and foaming to a region of the above to form a styrene resin extruded foam. The pressure when injecting the foaming agent is not particularly limited, and may be any pressure that is higher than the internal pressure of the extruder in order to inject it into the extruder.

  There are no particular limitations on the heating temperature, melting time, and melting means when the styrene resin is heated and melted. The heating temperature may be not less than the temperature at which the styrene resin melts, and usually about 150 to 250 ° C. The melting time varies depending on the amount of extrusion per unit time, the melting means, and the like, and thus cannot be determined unconditionally. However, the time required for uniformly dispersing and mixing the styrenic resin and the foaming agent is selected. In addition, the melting means is not particularly limited as long as it is used in normal extrusion foaming such as a screw type extruder. The temperature at the time of extrusion foaming from the die cannot be generally described because it is determined by various factors such as the type of resin, the type and amount of the foaming agent, the desired expansion ratio, etc. What is necessary is just to adjust suitably so that a physical property may be reached. When it is required to reduce the pressure fluctuation during extrusion or to increase the dispersibility of the foaming agent and increase the stability, a method for controlling the conditions such as increasing the pressure in the extruder, or the extruder, for example, A cooling and mixing apparatus as disclosed in Japanese Patent No. 5393, or a method of adding or connecting large-capacity items in a mixing apparatus capable of cooling having the same function, or a publicly known method generally called a static mixer or cavity transfer mixer It is possible to adopt a method of connecting the kneading apparatuses.

  The foaming agent used for extrusion foaming is preferably a non-halogen material from the viewpoint of environmental compatibility. Specifically, (ii) one or more saturated hydrocarbons selected from saturated hydrocarbons having 3 to 5 carbon atoms, and (b) compounds selected from dimethyl ether, diethyl ether and methyl ethyl ether, C) It is preferable to use a mixture with other non-halogen foaming agents. When the foaming agents (b), (b) and (c) above are used in combination, the thickness, width, density, closed cell rate, thermal conductivity, cell diameter, surface of the resulting extruded foam are obtained. It becomes easy to adjust the property to a desired value.

  Examples of the saturated hydrocarbon having 3 to 5 carbon atoms include propane, n-butane, i-butane, n-pentane, i-pentane, neopentane, and cyclopentane. Among these, at least one selected from the group consisting of propane, n-butane and i-butane is preferable because of good foamability. n-butane and / or i-butane are more preferred, and i-butane is particularly preferred.

  The saturated hydrocarbon having 3 to 5 carbon atoms is preferably 20 to 100 parts by weight, more preferably 30 to 80 parts by weight, particularly preferably 40 to 60 parts by weight with respect to 100 parts by weight of the total amount of the blowing agent. is there. By setting the content of the saturated hydrocarbon in the above range, the styrene resin is appropriately plasticized, the styrene resin and the foaming agent are uniformly kneaded in the extruder, and the pressure control of the extruder becomes easy.

  The compound selected from dimethyl ether, diethyl ether and methyl ethyl ether is preferably 0 to 80 parts by weight, more preferably 20 to 70 parts by weight, particularly preferably 40 to 60 parts by weight based on 100 parts by weight of the total amount of the blowing agent. Parts by weight. By using an ether compound and adjusting the content to the above range, an extruded foam having excellent moldability can be obtained.

  Examples of other non-halogen blowing agents include those selected from the group consisting of water, carbon dioxide, and alcohol. By using these as a blowing agent, the amount of a compound selected from (i) a saturated hydrocarbon having 3 to 5 carbon atoms and (b) dimethyl ether, diethyl ether, and methyl ethyl ether can be reduced.

  As other non-halogen blowing agents, water is preferably 0 to 80 parts by weight, more preferably 3 to 70 parts by weight, particularly preferably 3 to 30 parts by weight, based on 100 parts by weight of the total amount of the blowing agent. Most preferably, it is 5 to 20 parts by weight.

  The density of the foam board used in the roll receiver of the present invention varies depending on the load bearing performance required and cannot be specified unconditionally, but is preferably 20 to 200 g / L, more preferably 25 to 100 g / L, and more preferably 30 to 60 g / L. Is particularly preferred. The higher the density, the better the load bearing performance, but the weight of the receiver increases. The density can be calculated from the weight of the foam and the volume obtained by the submersion method.

  In the extrusion foaming method, as shown in FIG. 3, a desired cross-sectional shape is formed by a molding die 22 or a molding roll 23. Foam boards produced by the extrusion foaming method tend to be stretched in the extrusion direction. In particular, this tendency is large in a foam board having a small thickness, specifically, a foam board having a thickness of 5 to 100 mm, further 20 to 60 mm, particularly 25 to 40 mm. Such a foam board has a flat structure in which bubbles, particularly bubbles near the surface, are long in the extrusion direction. An extruded foam board stretched in the extrusion direction has a high mechanical strength in a direction parallel to the extrusion direction (hereinafter simply referred to as the extrusion direction). Therefore, in the roll receiver of the present invention, it is preferable that the direction parallel to the extrusion direction in the extrusion foaming of the styrene resin foam board is a direction that supports the load of the roll.

  Specifically, a styrene resin extruded foam having a flatness in the extrusion direction of bubbles near the surface of the foam board of 1.1 to 20, preferably 1.2 to 10 is preferable. Styrenic resin extrusion in which the flatness in the extrusion direction of the bubbles near the surface is in the above range, and the flatness in the extrusion direction of the bubbles near the center of the foam board is 1.1 to 20, preferably 1.2 to 10. A foam is more preferred. The flatness of the bubble in the extrusion direction is measured as follows.

  A predetermined range of the cross section along the extrusion direction of the styrene resin extruded foam is sampled. The cross section along the extrusion direction is a cross section extending in the thickness direction in the extrusion direction of the styrene resin extruded foam. In the case of air bubbles near the surface of the foam board, the predetermined range is near the center of the portion from the surface perpendicular to the thickness direction of the styrene resin extruded foam to 2 mm in the thickness direction. In the case of bubbles near the center of the foam board, it is near the center of the styrene resin extruded foam. When a predetermined number of bubbles to be described later cannot be obtained with one sample, a plurality of locations may be sampled.

  Each sampled sample is photographed using a scanning electron microscope (SEM) to obtain an SEM image. The photographing magnification of the SEM image is set to about 40 times. The imaging range is, for example, about several mm to several cm in length × width. Each SEM image is processed using an image processing apparatus (for example, product name: PIAS-II, manufactured by Pierce Co., Ltd.) with the thickness direction as the vertical direction and the extrusion direction as the horizontal direction. The bubble area (hereinafter referred to as “bubble area”) (a) is obtained. Further, the maximum diameter (Feret diameter) in the longitudinal direction (thickness direction: zf) and lateral direction (extrusion direction: xf) of the bubbles is determined. Note that the measurement of the bubble area and the maximum diameter is for only the bubble in which the entire view of the bubble is projected in the SEM image, and a part of the bubble is missing at the edge of the SEM image or the edge of the SEM image. Even if it is not a part, a part of the bubble wall is missing, or a bubble integrated with an adjacent bubble or the like is excluded. The number of bubbles to be measured is preferably at least 100. Therefore, in some cases, 100 or more bubbles can be measured with one SEM image, but in other cases, two or more SEM images may be used.

Assuming that each bubble in the SEM image is elliptical, the bubble diameter X in the extrusion direction and the bubble diameter Z in the thickness direction of each bubble are obtained according to the following formulas (1) and (2).
X = [{(4 × a) / (π × xf × zf)} 1/2] × xf: (1)
Z = [{(4 × a) / (π × xf × zf)} 1/2] × zf: (2)
Then determine the average cell diameter X _av extrusion direction and the number average each cell diameter X of the extrusion direction to obtain an average cell diameter in the thickness direction and the number average each cell diameter Z _av in the thickness direction. The flatness of the bubble in the extrusion direction is determined as _Xav / _Zav . Similarly, the flatness in the width direction can be obtained. The flatness in the width direction is preferably smaller than the average bubble flatness in the extrusion direction.

  As indicated above, flatness is measured for virtually all bubbles. Desirably, the flatness measured for substantially all bubbles is in the above range. However, large bubbles tend to be flat compared to small bubbles. Even if it is a styrene resin extruded foam having a flatness ratio of 1.1 to 20, preferably 1.2 to 10, measured only for large bubbles having a bubble diameter X in the extrusion direction of 200 μm or more in the measurement method described above. It can be used for the roll receiver of the present invention.

  As a method of controlling the flatness ratio in the extrusion direction of the bubbles, for example, a method of adjusting the thickness expansion rate when the molten resin is foamed into the atmosphere at the time of extrusion foaming, that is, the slit thickness and the molding die for rectangularization A method for adjusting the height is mentioned. In addition, as a preferred method, the die lip temperature is adjusted to a temperature lower by 10 to 60 ° C. than the resin temperature discharged from the extruder, and after the styrene resin extruded foam is extruded and foamed, the linear velocity at the time of extrusion foaming is adjusted. On the other hand, there is a method of further stretching at a linear speed of 1.01 to 1.20 times to form a plate shape. Moreover, the method of extending | stretching while heating an extrusion foam is mention | raise | lifted. Specifically, the heated extruded foam is heated by rotating the roll faster than the rotation speed of the take-up machine using a heating and stretching apparatus that performs stretching treatment with a roll while heating the extruded foam with heated air. Stretching is performed. Thereby, the extruded foam is stretched in the extrusion direction, and the bubble flatness in the extrusion direction is increased. When the extrusion foaming method is used as described above, a foam board having a large cell flatness in the extrusion direction and a high mechanical strength in the direction can be easily obtained.

  In the extrusion foaming method, the surface of the foam in contact with the molding die or the molding die has a skin layer having a specific gravity greater than that inside the molded body. In the present invention, it is desirable that the foam board having the surface skin layer obtained by the extrusion foaming method is used as it is as a plate-shaped member of the roll receiver without removing the surface skin layer. Foam boards with a rectangular cross-section by extrusion foaming have surface skin layers on the top and bottom surfaces and side surfaces in the extrusion direction, but the final product usually has no skin layers on the top and bottom surfaces. . The foam board by the extrusion foaming method is mostly used as a building material, but it is often necessary to adhere to concrete or the like, in order to remove a skin-like surface layer that is inferior in adhesion to concrete or the like. Another reason is that a plurality of foam boards may be manufactured from a thick foam board by slicing or the like. When the foam board by the extrusion foaming method is used for the roll receiver, it is not desirable to use the foam board from which the surface is removed. Therefore, it is preferable to use the foam board produced at the time of extrusion foaming as it is as a plate-like member of the roll receiver, leaving the skin-like surface layer as it is.

  The thickness of the foam board used in the roll receiver of the present invention varies depending on the required load resistance and the density of the foam and cannot be defined unconditionally, but is preferably 5 to 100 mm, more preferably 20 to 60 mm, particularly 25 to 25 mm. 40 mm is preferable. It is preferable to use an extruded foam board manufactured with a thickness of 20 to 60 mm and a density of 25 to 100 g / L as a plate member of a roll receiver while having a surface skin layer. More preferably, an extruded foam board manufactured with a thickness of 25 to 40 mm and a density of 30 to 60 g / L is used as a plate-like member of a roll receiver while having a surface skin layer.

  Bubbles having various bubble diameters are usually present in the foam board produced by the extrusion foaming method. In the foam board used for the roll receiver of the present invention, the average cell diameter is preferably 10 to 1000 μm, and more preferably 100 to 600 μm. The average bubble diameter is determined as follows. The longitudinal section along the extrusion direction of the extruded foam and the transverse section perpendicular to the extrusion direction were magnified 30 times with a scanning electron microscope (manufactured by Hitachi, Ltd., product number: S-450), and photographed. Copy the photograph taken with a dry copier. For the copied image, 3 to 5 lines are drawn in each of the extrusion direction, the thickness direction, and the width direction of the foam, and the line length is divided by the number of cells included in each line to thereby obtain the respective directions. The average cell diameter is obtained (the average cell diameter in the extrusion direction and thickness direction of the foam is obtained from the copy of the longitudinal section, and the average cell diameter in the width direction of the foam is obtained from the copy of the transverse section). Each line is drawn except for partially missing cells located at the edge of the image. Regarding the average cell diameter in each direction, the average cell diameter in the extrusion direction is X, the average cell diameter in the width direction is Y, the average cell diameter in the thickness direction is Z, and the cube root of the product of X, Y, and Z is Calculate the average cell diameter of the foam.

  The bubble diameter distribution pattern in the foam board may be a pattern having a single peak or a pattern having a plurality of peaks as described in JP-A-2007-308627. The bubble diameter distribution pattern can be obtained by the method described in JP-A-2007-308627.

  The closed cell ratio in the foam board is preferably 70% or more, and more preferably 80% or more. The closed cell ratio is calculated according to ASTM D-2856 using a multi-pynometer (manufactured by Yuasa Ionics Co., Ltd.).

  As shown in FIGS. 1 and 2, the roll receiver 1 of the present invention is obtained by forming an opening 3 in a plate-like member 2. As the shape of the plate-like member 2, a polygonal shape such as a square, a rectangle, or a hexagon can be suitably employed. In particular, a rectangular shape such as a square or a rectangle is preferable, but other shapes are employed. You can also. The opening 3 can be provided at an arbitrary position of the plate-like member 2, but is preferably formed at a substantially central portion of the plate-like member 2 in order to suspend and support the roll 10.

  The roll 10 suspended and supported by the roll receiver 1 of the present invention is obtained by winding a material to be wound 11 such as a sheet or a film around a core 12. A typical method for supporting the roll 10 using the roll receiver 1 of the present invention is to place the roll receiver 1 on both sides of the roll 10 and project to both sides of the roll 10 as shown in FIGS. In this method, both ends of the core 12 to be engaged are respectively fitted to the openings 3 of the roll receiver 1 and suspended.

  When the core 12 does not protrude to both sides of the roll 10, as shown in FIG. 4, a substantially cylindrical connector made of plastic or the like with the roll receiver 1 disposed on both sides of the roll 10. A method of suspending and supporting the (plug) 4 through the opening 3 and both ends of the core 12 can be used. In addition, when the core 12 is not present and is hollow, it can be suspended using a rod (not shown) such as a pipe penetrating the hollow portion or the connector 4.

  FIG. 5 is an example of the shape of the opening 3 provided in the plate-like member 2 that is preferably employed in the present invention, such as a round opening as shown in (a), or as shown in (b). A U-shaped opening or a flask-shaped opening as shown in FIG. When the lower end of the opening 3 that receives the load of the roll 10 is an arc, the diameter of the circle is preferably 60 to 200 mm.

  In the roll receiver of the present invention, a laminated plate obtained by laminating a non-foamed synthetic resin plate on both plate surfaces of a styrene resin foam board by extrusion foaming can be used as the plate-like member. When such a laminated board is used, the load bearing performance of the roll receiver can be improved. However, it is possible to use a styrene resin foam board by extrusion foaming as it is as a plate member. In this case, the roll load is supported only by the styrene resin foam board substantially by extrusion foaming, but the roll is low-cost and used for a relatively small weight roll of 500 kg or less, particularly 300 kg or less. It can be suitably used for a receiving tool.

  Hereinafter, the present invention will be described by way of examples. In addition, this invention is not limited to a following example. In addition, the measuring method of load bearing performance is as follows.

(Load bearing performance)
A roll receiver having a length × width of 350 mm × 350 mm and a circular opening having a diameter of 100 mm in the center is prepared. Cut through a plane perpendicular to the length direction or the width direction through the center of the roll holder to create two cut pieces having a semicircular cutout. One of the cut pieces is placed on a horizontal plane so that the semicircular cutout is on the upper side. A metal member having the same shape as the semicircular cutout is disposed in the semicircular cutout. A load was applied to the metal member at a speed of 10 mm / min downward using an autograph, and the relationship between the load and the descending length of the metal member was determined. Since the strain (%) defined by the following equation is elastically deformed up to 2%, the load at the time of 2% strain is defined as the load bearing performance.
Distortion (%) =
(Descent length of the metal member) / (Length from the lower end of the semicircular notch to the lower part of the roll holder) × 100

Example 1
Kanelite Foam Super E-BK manufactured by Kaneka Co., Ltd. was used as a styrene-based resin extruded foam board used for the roll receiver. This foam board had a thickness of 35 mm, a density of about 40 g / L, and most of the air bubbles in the vicinity of the surface were flat air bubbles long in the extrusion direction. FIG. 6 shows an optical micrograph near the surface of the foam board. In this photograph, the horizontal direction is the extrusion direction in extrusion foaming. A plate-shaped member having a length × width of 350 mm × 350 mm was cut out from the foamed board, and a circular opening having a diameter of 100 mm was provided at the center to prepare a roll receiver. This roll receiver was cut along a plane perpendicular to the extrusion direction during extrusion foaming of the foam through the center of the opening, and an evaluation sample was prepared to determine load bearing performance. The load bearing performance was 155 kg.

Example 2
Kanelite Foam Super-X manufactured by Kaneka Corporation was used as the styrene resin extruded foam board used for the roll receiver. This foam board had a thickness of 35 mm and a density of about 40 g / L, and most of the bubbles were flat bubbles longer in the extrusion direction than Kanelite Foam Super E-BK. FIG. 7 shows an optical micrograph near the surface of the foam board. In this photograph, the horizontal direction is the extrusion direction in extrusion foaming. A plate-shaped member having a length × width of 350 mm × 350 mm was cut out from the foamed board, and a circular opening having a diameter of 100 mm was provided at the center to prepare a roll receiver. The roll receiver was cut along a plane perpendicular to the extrusion direction during extrusion foaming of the foam through the center of the opening, and an evaluation sample was prepared to determine load bearing performance. The load bearing performance was 261 kg.

Comparative Example 1
The foam board obtained by the bead method was used as the styrene resin foam used for the roll receiver. This foam board had a thickness of 35 mm and a density of about 40 g / L, and the cells had no directionality. FIG. 8 shows an optical micrograph near the surface of the foam board. A plate-shaped member having a length × width of 350 mm × 350 mm was cut out from the foamed board, and a circular opening having a diameter of 100 mm was provided at the center to prepare a roll receiver. The roll receiver was cut along a plane passing through the center and perpendicular to the length direction or the width direction of the roll receiver, and an evaluation sample was prepared to obtain load bearing performance. The load bearing performance was 142 kg.

Schematic explanatory drawing which shows one example of the roll suspension support method by the roll receiver of this invention. The longitudinal cross-sectional view of the roll receiver and roll in a roll suspension support state using the roll receiver. BRIEF DESCRIPTION OF THE DRAWINGS Schematic explanatory drawing which shows an example of the manufacturing method of the foam board used for this invention. The schematic explanatory drawing of the other roll suspension support method. The perspective view of the roll receiver of this invention provided with the opening part of a round shape, U shape, and a flask type. 2 is an optical micrograph near the surface of a foam board used in Example 1. FIG. 4 is an optical micrograph near the surface of a foam board used in Example 2. FIG. 3 is an optical micrograph near the surface of a foam board used in Comparative Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roll holder 2 Plate-shaped member 3 Opening part 4 Connection tool 10 Roll 11 Wound material 12 Core 21 Die 22 Mold 23 Molding roll

Claims (6)

A roll holder made of a styrene resin foam board manufactured by an extrusion foaming method , wherein the roll holder has a direction parallel to the extrusion direction in the extrusion foaming of the styrene resin foam board as a direction for supporting the load of the roll. . The roll receiver according to claim 1 , wherein only the styrene resin foam board formed by the extrusion foaming method supports the load of the roll. The roll receiver according to claim 1 or 2 , wherein a foam board having a surface skin layer obtained by an extrusion foaming method is used as a plate member of the roll receiver as it is. The roll receiver according to any one of claims 1 to 3, wherein the thickness of the styrene resin foam board is 20 to 60 mm. The roll receiver according to any one of claims 1 to 4, wherein the density of the styrene resin foam board is 25 to 100 g / L. A roll holder using a styrene resin foam board by an extrusion foaming method , wherein the roll holder has a direction parallel to the extrusion direction in the extrusion foaming of the styrene resin foam board as a direction for supporting the load of the roll. Manufacturing method .