JP6325700B1 - Metal plate coil mount - Google Patents

Abstract

There is provided a metal plate coil mount that is lightweight and has a small burden on an operator such as a trailer driver during movement. A gantry 3 on which a metal plate coil 1 is mounted, comprising a pair of inclined surfaces 6 for supporting the metal plate coil 1 and made of foamed polypropylene having a foaming ratio of 2 to 10 times, preferably In addition, a concave or convex connecting portion 4 is provided at the end in the longitudinal direction. [Selection] Figure 3

Description

  The present invention relates to a gantry on which a metal plate coil is placed.

Conventionally, a gantry 3 on which a metal plate coil 1 shown in FIG. 4 is placed is known (see, for example, Patent Document 1).
In this gantry 3, a metal plate coil 1 obtained by winding a rolled metal plate in a coil shape is supported by an inclined surface 6 having an inclination angle θ.
The gantry 3 is used as a gantry 3 that fixes the metal plate coil 1 when the metal plate coil 1 is loaded on a trailer that transports the metal plate coil 1.

JP 2006-281306 A

Conventionally, however, the gantry 3 has a problem in that it is difficult to handle because a heavy southern ocean wood having a specific gravity of about 0.7, such as Apiton, is used.
In particular, when the gantry 3 needs to be moved, the burden on the operator such as the driver of the trailer who performs the moving operation of the gantry 3 is large.
In addition, South Sea timber has become difficult to obtain due to overexploitation.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a metal plate coil gantry that is lightweight and has a small burden on workers such as a trailer driver during movement.

In order to achieve the above object, the metal plate coil mount of the present invention comprises:
A metal plate coil gantry comprising a pair of gantry frames and mounting a metal plate coil ,
Wherein each cradle is configured to have a inclined slope you support the metal plate coil, an expansion ratio Ri Tona 2-10 times foam polypropylene,
A concave or convex connection portion for connecting the gantry to each other in the longitudinal direction is provided at an end of each gantry along the longitudinal direction of the metal plate coil .

  Since the metal plate coil mount of the present invention is made of foamed polypropylene having a foaming ratio of 2 to 10 times, it is lightweight and has a small burden on operators such as trailer drivers during movement.

Also, in the configuration of the present invention, mounting member each metal plate coils divided in the direction of the central axis of the metal plate coils that have a connecting portion of the concave or convex to the end portion in the longitudinal direction.
According to such a configuration, since the concave or convex connecting portion provided at the end in the longitudinal direction can be connected or removed, the length of the gantry can be freely adjusted according to the length of the metal plate coil. .

  According to the present invention, it is lightweight and has a small burden on an operator such as a trailer driver during movement, and the length of the gantry can be freely adjusted according to the length of the metal plate coil. Can provide a mount.

It is a front view which shows the use condition of the mount for metal plate coils which concerns on embodiment of this invention. It is sectional drawing of the mount for metal plate coils which concerns on embodiment of this invention. It is a perspective view of the metal plate coil mount which concerns on embodiment of this invention. It is a perspective view which shows the use condition of the conventional metal plate coil stand.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the metal plate coil gantry according to this embodiment is composed of a pair of gantry 3 composed of prisms arranged symmetrically with respect to the vertical direction, and each of the pair of gantry 3 It has the structure which supports the metal plate coil 1 by the inclined surface 6 provided in this.
This inclined surface 6 is disposed symmetrically with respect to the vertical direction. Since the pair of inclined surfaces 6 support the bottom of the metal coil 3, there is no possibility that the metal plate coil 1 rolls left and right.

Further, side stanchions 5 are arranged on both side surfaces of the gantry 3.
Since this stanchion 5 fixes both side surfaces of the coil mount, the coil mount 1 does not move in the left-right direction.
Further, front and rear surface stanchions (not shown) are arranged on the front and rear surfaces of the gantry 3, and the front and rear surface stanchions fix the front and rear surfaces of the coil gantry, so that the coil gantry 1 does not move in the front and rear direction.
The metal plate may be any of various steel plates such as ordinary steel, electromagnetic steel, stainless steel, and aluminum.

A wire 2 for fixing the metal plate coil 1 is attached to the upper surface of the metal plate coil 1. The metal plate coil 1 is pressed downward by the tension of the wire 2.
According to this embodiment, since the inclined surfaces 6 arranged symmetrically in contact with and support the bottom of the metal plate coil 1, the contact area between the metal plate coil 1 and the gantry is increased to distribute the load. In addition, the surface of the metal plate coil 1 can be prevented from wrinkling.

  As shown in FIGS. 2 and 3, the cross section of the gantry 3 has a trapezoidal shape with the inclined surface 6 as a hypotenuse.

Further, a concave or convex connection portion 4 is provided at the end of the gantry 3. By fitting the concave and convex joints together, the gantry 3 can be connected in the longitudinal direction. As a result, the length of the gantry 3 can be freely adjusted according to the length of the metal plate coil 1, and the load space can be saved.
Note that the cross-sectional shape of the gantry 3 is not limited to a trapezoid, and may be a polygon having a hypotenuse that forms the inclined surface 6.
Further, the corner 3 of the cross section of the gantry 3 is provided with an inclination and R.
Further, the size of the gantry 3 may be appropriately selected within a range of, for example, a length of 2000 to 2500 mm and a width and height of 100 to 200 mm in accordance with the size of the metal plate coil 1.

The material of the gantry 3 is made of foamed polypropylene having a foaming ratio of 2 to 10 times.
If the expansion ratio is less than 2, the compression strength at 50% compression is over 20 kg / cm ² , but the density is over 0.5 g / cm ^{3 and} becomes heavy.
On the other hand, if the expansion ratio is more than 10 times, the density of the molded product is less than 0.09 g / cm ³ , but the compression strength at 50% compression is less than 7 kg / cm ² and sufficient strength cannot be obtained.
Since the density of this molded polypropylene is as light as 0.09 to 0.5 g / cm ³ , the gantry 3 can be easily moved, and the burden on operators such as trailer drivers is small.
In addition, this expanded polypropylene is easy to mold and has a sufficient strength to support the metal coil 1 because the compression strength at 50% compression is 7 to 20 kg / cm ² .
In addition, the said foaming polypropylene means the material of an in-mold foaming molding, and is not the material of a foaming particle.

The expanded polypropylene used for the gantry 3 can be manufactured by an in-mold foam molding method called a bead method.
The expanded polypropylene in the present embodiment can be obtained by in-mold foam molding of polypropylene resin expanded particles obtained by expanding polypropylene resin particles.
There is no restriction | limiting in particular in the polypropylene-type resin used by this Embodiment, The copolymer etc. which consist of a propylene homopolymer, a propylene, and a C2- or 4 or more olefin are mentioned.

Here, the olefin having 2 or 4 or more carbon atoms is not particularly limited, and specifically, ethylene, 1-butene, isobutene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4- Examples include α-olefins such as methyl-1-pentene, 3,4-dimethyl-1-butene, 1-heptene, 3-methyl-1-hexene, 1-octene and 1-decene. Furthermore, cyclic olefins such as cyclopentene, norbornene, tetracyclo [6,2,1 ^1,8 , 1 ^3,6 ] -4-dodecene, 5-methylene-2-norbornene, 5-ethylidene-2-norbornene, 1,4 -Dienes such as hexadiene, methyl-1,4-hexadiene, and 7-methyl-1,6-octadiene. These olefins having 2 or 4 carbon atoms may be used alone or in combination of two or more.

Among these, as the olefin having 2 or 4 carbon atoms, ethylene or α-olefin is more preferable, and ethylene and 1-butene are most preferable.
In the present embodiment, among polypropylene resins, a propylene homopolymer, a propylene / ethylene random copolymer, and a propylene / ethylene / 1-butene random copolymer are preferable from the viewpoint of good foamability.
Among these, in 100% by weight of the polypropylene resin, the structural unit composed of propylene is 90% by weight to 100% by weight, and the structural unit composed of ethylene and / or 1-butene is 0% by weight to 10% by weight. Some are preferable, and the structural unit composed of propylene is 92% by weight or more and 99% by weight or less, and the structural unit composed of ethylene and / or 1-butene is 1% by weight or more and 8% by weight or less.
When the structural unit composed of ethylene and / or 1-butene is in the above range, the moldability when obtaining foamed polypropylene by in-mold foam molding is good, and the metal plate is used as the metal plate coil mount 3. It tends to be able to withstand the load of the coil.

The melt flow rate of the polypropylene resin used in the present embodiment (hereinafter sometimes referred to as “MFR”) is not particularly limited, but is preferably 0.5 g / 10 min to 100 g / 10 min, and preferably 2 g / 10 min or more and 50 g / 10 min or less are more preferable, and 3 g / 10 min or more and 20 g / 10 min or less are more preferable. When the MFR is in the above range, the moldability when obtaining foamed polypropylene by in-mold foam molding tends to be good.
Here, MFR uses the MFR measuring instrument described in JIS-K7210, under the conditions of orifice 2.0959 ± 0.005 mmφ, orifice length 8.000 ± 0.025 mm, load 2160 g, 230 ± 0.2 ° C. This is the value when measured.

Although there is no restriction | limiting in particular in melting | fusing point of the polypropylene resin used by this Embodiment, It is preferable that it is 125 to 150 degreeC. When using a polypropylene resin in this melting point range, the moldability when obtaining foamed polypropylene by in-mold foam molding is good, and when it is used as the metal plate coil mount 3, it sufficiently withstands the load of the metal plate coil. It is easy to become something that can be.
Here, the melting point of the polypropylene resin is a value measured under the following conditions by a differential scanning calorimeter method (DSC method).

  That is, 5-6 mg of polypropylene resin is melted by raising the temperature from 40 ° C. to 220 ° C. at a rate of 10 ° C./min, and then crystallized by lowering the temperature from 220 ° C. to 40 ° C. at 10 ° C./min. In the DSC curve obtained when the temperature is further increased from 40 ° C. to 220 ° C. at 10 ° C./min after melting, the melting peak temperature at the second temperature increase is taken as the melting point.

  In this embodiment, the polypropylene resin is usually melted in advance using an extruder, kneader, Banbury mixer, roll, etc., so that it is easy to form expanded particles, and is cylindrical, elliptical, spherical, cubic, rectangular parallelepiped And so on to obtain a polypropylene resin particle.

In this embodiment, in addition to the polypropylene resin, additives such as an antioxidant, a light resistance improver, an antistatic agent, a colorant, a flame retardant improver, and a conductivity improver are added as necessary. System resin particles may be used. In particular, when carbon dioxide, air, or water is used as the foaming agent described later, it is preferable to add an inorganic nucleating agent and / or a water-absorbing substance that can improve foamability.
In that case, it is usually preferable to add these additives into the molten resin in the process of producing polypropylene resin particles.

The inorganic nucleating agent used in the present embodiment promotes the formation of bubble nuclei that are the starting point of foaming, contributes to improvement of the foaming ratio, and also contributes to uniform bubble formation. Examples of the inorganic nucleating agent include talc, silica, calcium carbonate and the like.
The amount of the inorganic nucleating agent added in the present embodiment is preferably 0.005 parts by weight or more and 0.5 parts by weight or less with respect to 100 parts by weight of the polypropylene resin.

The water-absorbing substance used in the present embodiment refers to a polypropylene resin when the substance is added to polypropylene resin particles and the polypropylene resin particles are brought into contact with water or impregnated with a foaming agent in an aqueous dispersion. A substance that can contain water in the particles.
Specific examples of the water-absorbing substance include water-soluble inorganic substances such as sodium chloride, calcium chloride, magnesium chloride, borax, and zinc borate, polyethylene glycol, and a special block polymer having a hydrophilic segment as a polyether (trade name: Perestat (manufactured by Sanyo Chemical Co., Ltd.), alkali metal salt of ethylene (meth) acrylic acid copolymer, alkali metal salt of butadiene (meth) acrylic acid copolymer, alkali metal salt of carboxylated nitrile rubber, isobutylene-anhydrous Examples thereof include hydrophilic polymers such as alkali metal salts of maleic acid copolymers and alkali metal salts of poly (meth) acrylic acid, polyhydric alcohols such as ethylene glycol, glycerin and pentaerythritol, isocyanuric acid, melamine and the like.

  The amount of water-absorbing substance added in the present embodiment varies depending on the target foaming ratio, the foaming agent used, and the type of water-absorbing substance used, and cannot be generally described, but water-soluble inorganic substances, polyhydric alcohols, When using isocyanuric acid and melamine, it is preferably 0.01 parts by weight or more and 2 parts by weight or less with respect to 100 parts by weight of the polypropylene resin, and when using a hydrophilic polymer, 100 parts by weight of the polypropylene resin is used. On the other hand, it is preferably 0.05 parts by weight or more and 5 parts by weight or less.

In the present embodiment, there is no limitation on the addition of the colorant, and it is possible to obtain a natural color without adding the colorant, or to add a colorant such as blue, red, or black to obtain a desired color. it can.
Examples of such colorants include perylene organic pigments, azo organic pigments, quinacridone organic pigments, phthalocyanine organic pigments, selenium organic pigments, dioxazine organic pigments, isoindoline organic pigments, and carbon black. .
The expanded polypropylene of the present embodiment can be obtained by in-mold foam molding of polypropylene-based resin expanded particles obtained by expanding the aforementioned polypropylene-based resin particles.

The polypropylene resin foam particles used in the present embodiment are, for example, a polypropylene resin particle, water, and a dispersion liquid containing an inorganic dispersant is contained in a pressure vessel and then dispersed under stirring conditions. In the presence of a foaming agent, the temperature is raised above the softening point temperature of the polypropylene resin particles, and then the dispersion in the pressure vessel is discharged to a pressure range lower than the internal pressure of the pressure vessel to foam the polypropylene resin particles. Can be manufactured.
Here, when raising the temperature above the softening point temperature, raising the temperature to a temperature in the range of the melting point of the polypropylene resin particles −20 ° C. or more and the melting point of the polypropylene resin particles + 10 ° C. or less is to ensure foamability. preferable.

  Examples of the blowing agent used in the present embodiment include aliphatic hydrocarbons such as propane, normal butane, isobutane, normal pentane, isopentane, and hexane; alicyclic hydrocarbons such as cyclopentane and cyclobutane; air, And inorganic foaming agents such as nitrogen, carbon dioxide and water. These foaming agents may be used alone or in combination of two or more. Among these, carbon dioxide gas, air, and water are preferably used.

The amount of the foaming agent used in the present embodiment is not limited, and may be appropriately used depending on the desired expansion ratio of the polypropylene resin expanded particles, and the amount used is 3 with respect to 100 parts by weight of the polypropylene resin particles. It is preferable that it is not less than 60 parts by weight.
There is no particular limitation on the pressure vessel used when producing the expanded polypropylene resin particles, and any vessel that can withstand the pressure and temperature in the vessel at the time of producing the expanded polypropylene resin particles can be used. For example, an autoclave type pressure vessel can be used. It is done.

  Examples of the inorganic dispersant used in the present embodiment include tribasic calcium phosphate, tribasic magnesium phosphate, basic magnesium carbonate, calcium carbonate, basic zinc carbonate, aluminum oxide, iron oxide, titanium oxide, and aluminosilicate. , Kaolin, barium sulfate and the like.

In the present embodiment, it is preferable to use a dispersion aid in combination in order to improve dispersibility.
Examples of the dispersion aid in the present embodiment include sodium dodecylbenzene sulfonate, sodium alkane sulfonate, sodium alkyl sulfonate, sodium alkyl diphenyl ether disulfonate, sodium α-olefin sulfonate, and the like.
Among these, as a combination of the inorganic dispersant and the dispersion aid, a combination of tricalcium phosphate and sodium alkylsulfonate is preferable.
The amount of inorganic dispersant and dispersion aid used in the present embodiment varies depending on the type and the type and amount of polypropylene resin used, but usually 0.2 wt.% Of inorganic dispersant with respect to 100 parts by weight of water. The amount is preferably 3 parts by weight or more and 3 parts by weight or less, and more preferably 0.001 part by weight or more and 0.1 parts by weight or less. Moreover, in order to make the dispersibility in water favorable, it is usually preferable to use the polypropylene resin particles at 20 parts by weight or more and 100 parts by weight or less with respect to 100 parts by weight of water.

  The amount of the inorganic dispersant adhering to the surface of the expanded polypropylene resin particles used in the present embodiment is preferably 2000 ppm or less, more preferably 1300 ppm or less, and even more preferably 800 ppm or less. When the amount of the inorganic dispersant is within this range, the fusion property at the time of in-mold foam molding tends to be good.

The expansion ratio of the polypropylene resin expanded particles of the present embodiment is preferably 1.1 times to 15 times, and more preferably 1.5 times to 10 times.
Here, the expansion ratio of the expanded polypropylene resin particles is determined by obtaining the weight w (g) of the expanded polypropylene resin particles and the volume of ethanol submerged volume v (cm ³ ), and the density d (= 0.9 g) of the expanded polypropylene resin before expansion. / Cm ³ ) and obtained from the following equation.
Foaming ratio = d × v / w

Although there is no restriction | limiting in particular in the bulk density of the polypropylene resin expanded particle of this Embodiment, 50 g / L or more and 600 g / L or less are preferable, and 100 g / L or more and 200 g / L or less are more preferable.
Here, the bulk density of the expanded polypropylene resin particles is determined by measuring the weight of the expanded polypropylene resin particles in the container after the polypropylene expanded resin particles are gently put into the container and filling it. Divided by g / L.
The polypropylene resin expanded particles thus obtained can be subjected to in-mold foam molding to obtain expanded polypropylene.

  The expanded polypropylene resin particles used in the present embodiment have a melting peak ratio QH / (QL + QH) × 100 (%) on the high temperature side in a DSC curve obtained when calorimetric measurement is performed by a differential scanning calorimetry method. (Hereinafter abbreviated as “DSC peak ratio”) is preferably 10% or more and 50% or less, and more preferably 13% or more and 30% or less. When the DSC peak ratio of the polypropylene resin expanded particles is within this range, it is easy to obtain a polypropylene resin in-mold expanded foam (expanded polypropylene) with high surface beauty.

The DSC peak ratio may be measured by a conventionally known method, for example, according to the method described in JP 2012-184303 A. QH and QL are as defined in JP 2012-184303 A.
The DSC peak ratio is, for example, the retention time from the temperature rise to the foaming when obtaining the polypropylene resin foamed particles (maintenance time from reaching the foaming temperature to the foaming), the foaming temperature (at the time of foaming). Temperature), foaming pressure (pressure during foaming), and the like. Generally, the DSC peak ratio tends to increase by increasing the holding time, lowering the foaming temperature, and lowering the foaming pressure.

From the above, it is possible to easily find a condition that provides a desired DSC peak ratio by performing several experiments in which the holding time, the foaming temperature, and the foaming pressure are appropriately changed in a systematic manner. The foaming pressure can be adjusted by adjusting the amount of foaming agent.
In the present embodiment, the foamed polypropylene resin particles are formed into foamed polypropylene by in-mold foam molding. For example, the following conventionally known methods can be used as the in-mold foam molding method.
B) Method of performing in-mold foam molding of polypropylene resin expanded particles as they are b) Injecting an inorganic gas such as air into polypropylene resin expanded particles in advance to give internal pressure (foaming ability), and then performing in-mold foam molding Method C) Method of filling the mold with polypropylene resin foam particles in a compressed state and performing in-mold foam molding

  As a specific example of a method for obtaining expanded polypropylene using the polypropylene resin expanded particles of the present embodiment, for example, the polypropylene resin expanded particles are pre-air-pressurized in a pressure resistant container, and air is introduced into the polypropylene resin expanded particles. By press-fitting, an internal pressure (foaming ability) is applied, and this is filled into a molding space that can be closed but cannot be sealed by two molds, and steam or the like is used as a heating medium in the range of 0.1 MPa to 0.4 MPa. After molding with heating steam pressure of about (gauge pressure) and heating time of about 3 seconds to about 60 seconds, after fusing the polypropylene resin foamed particles, the mold is cooled by water and then taken out from the mold After cooling to such an extent that the deformation of the expanded foam in the polypropylene resin mold is suppressed, the mold is opened and the expanded foam in the polypropylene resin mold (foamed poly A method of obtaining a propylene) can be mentioned.

  The internal pressure of the polypropylene resin expanded particles is, for example, 0.1 MPa or more and 1.0 MPa by an inorganic gas such as air or nitrogen under a temperature condition of 1 hour to 48 hours, room temperature to 80 ° C. in a pressure vessel. (Gauge pressure) It can be adjusted by applying pressure below.

Density of the molded body made of expanded polypropylene according to the present embodiment, 0.09 g / cm ³ or more, preferably 0.5 g / cm ³ or less, 0.18 g / cm ³ or more, 0.5 g / cm ³ or less, more preferable.
The density of the molded body made of expanded polypropylene was determined by determining the expanded polypropylene volume V (cm ³ ) from the rise in water level when the expanded polypropylene was submerged in a water tank, and using the measured expanded polypropylene weight W (g). This is a value calculated from / V.

Further, the expansion ratio of the expanded polypropylene of the present embodiment is preferably 2 times or more and 10 times or less, and more preferably 2 times or more and 5 times or less.
If the expansion ratio is less than 2 times, it is difficult to reduce the weight of the metal plate coil mount 3, and if it exceeds 10 times, the load of the metal plate coil tends to be unbearable.
The expansion ratio of the expanded polypropylene is a value obtained by dividing the density of the polypropylene resin before foaming by 0.9 g / cm ³ by the density of the formed body.

DESCRIPTION OF SYMBOLS 1 Metal plate coil 2 Wire 3 Mount 4 Connection part 5 Side stanchion 6 Inclined surface

Claims (1)

A metal plate coil gantry comprising a pair of gantry frames and mounting a metal plate coil ,
Wherein each cradle is configured to have a inclined slope you support the metal plate coil, an expansion ratio Ri Tona 2-10 times foam polypropylene,
A metal plate coil gantry characterized in that a concave or convex connection portion for connecting the gantry to each other in the longitudinal direction is provided at an end of each gantry along the longitudinal direction of the metal plate coil.

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