JP2002011743A - Reinforced plastic molded object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that a lightweight molded object having strength is required but, in a sandwich structure wherein surface materials are bonded to both upper and rear surfaces of plastic foam, the plastic foam is weak against compression and a panel is deformed to become thin and, therefore, bending strength is not sufficiently developed and a sound absorbing material having lightweight properties, strength and good sound absorbing properties is also required. SOLUTION: A metal element such as a rod, a pipe, a plate or the like is passed through the upper and lower flat plates of mold to be fixed to the mold and a powdery or granular plastic material excellent in shaking properties is put in the mold to be heated while rotated and the plastic material is melted on the inner surface of the mold and the surface of the metal element to mold an extremely tough molded object having a continuous skin. Since this molded object is not thinly deformed even if it receives compression force due to bending load, it has high bending strength and shearing strength and can be used as a structural material. If this molded object is filled with a sound absorbing material and small holes are bored in the upper and lower skins of the molded object, the molded object can be expected as a sound absorbing material having lightweight properties and strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention is a molded article of plastic according to claim 1.

[Technical field to which the invention pertains] Building materials, heat insulating materials, cushioning materials, floating materials, sound absorbing materials, cushioning materials, etc.

[0003] 2. Description of the Related Art [0004] A conventional sandwich panel is made of a plastic foam as a core material, and a plastic surface material is adhesively bonded on and under the core material, and is characterized by light weight and heat insulation. However, since the compressive strength and shear strength of the core material are not sufficient, the upper and lower surface materials come close to each other when the compressive force and shear force due to bending are applied. Could not.

[0004]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of molding a plastic powder into a mold having two substantially parallel surfaces, one surface being followed by a metal body on the opposite surface or the other having a slight gap. This is a plastic molded body having excellent bending characteristics, in which a continuous skin is formed on the inner surface of the mold and the surface of the metal body while being heated from the outside while being rotated. The periphery of the molded body is composed of, for example, two upper and lower flat plates and four flat sides in the thickness direction. Since the upper and lower flat plates are connected by a pipe-shaped reinforcing member, they receive a compressive force and a shear force. However, since it is not deformed and has a high rigidity and maintains a predetermined thickness, it can be used as a structural material having particularly large bending strength and shear strength. And, if an appropriate radius is attached to the connection between the upper and lower skin and the pipe-shaped reinforcement, the upper and lower flat plates and the reinforcement can be firmly joined together. Is evenly propagated throughout the molded body, so that a flat plate having excellent impact characteristics can be obtained. This radius is usually 1 mm or more, preferably 3 mm or more,
In addition, an optimum radius is appropriately determined according to the form of the load.

[0005] Metals are usually materials with good thermal conductivity.
Therefore, the metal fittings to be attached to the mold are rods, pipes or flat plates made of metal such as iron or brass, which have good heat conductivity. One end has, for example, a head outside the mold and in contact with the mold, and the other end. Is a screw, and a nut is put on it, and this nut comes into contact with the mold. Since the head and nut of this screw are larger than the pipe and rod and are in contact with the mold, when heat is applied from the outside, heat is directly supplied to the bolt or pipe in the mold, and the powder plastic is molded. Can be melt-adhered to the surface of the metal body as well as the inner surface of the metal body. And
Even if there is a slight gap in the metal body, the generated plastic reinforcement and the skin material can be connected. Since the portion where the plastic powder adheres to the metal body is smooth, the metal body can be easily removed from the molded body after cooling. This metal body does not necessarily have to be circular, but may be square or plate-shaped. Then, in order to attach a large radius to the connection between the plate and the metal body, the thermal conductivity of the metal body is large, the head of the bolt and the nut are larger than the size of the bolt, the thickness is thick, and the metal is thick. It must be in good contact with the upper and lower plates.

[0006] The size of the pipe-shaped reinforcement is usually 3 to 100 mm in outer diameter, 2 to 12 mm in thickness, and the same as the thickness of the skin of the mold. The length of the reinforcing member is usually 10 mm or more, and can be 1000 mm if necessary. However, the longer the length, the larger the diameter and the thicker the wall. In the case of an extremely thick flat plate, the thickness of the surface material is also changed according to the thickness of the pipe-shaped reinforcing material.
The reinforcement of the upper and lower plates of the plate-like body should be in the center if only one is needed, and if it is insufficient, it should be placed in the middle between the center and the corner.
Stand up a book pillar. Further, when necessary, the pillars may be arranged on a flat plate as evenly as possible. It is preferable that the reinforcing members are arranged in two or more rows both in the vertical and horizontal directions in order to improve the bending strength and the shear strength.

In a cube or a rectangular parallelepiped, not only the upper and lower surfaces are reinforced, but also the front, rear, left and right surfaces are reinforced. It is normal to make the density of the reinforcing body uniform on all surfaces and make the strength the same, and especially when pressure or impact force is applied to a certain surface,
Increase the reinforcement density on that surface. The sphere is evenly reinforced by adding four reinforcing columns diagonally outside the top, bottom, front, back, left and right. In a ring-shaped buoyant body, the outermost side receives an impact, so that the reinforcing body is set up at a right angle to this portion to join the inner side and the outermost side. In addition, a two-piece molded body is formed, a joint is projected, a hole is formed, and a bolt is used for connection, and a protruding part that is strong against an impact is disposed in a place where the impact is easily received.

In a vertically long tank or the like, since a large weight is added to the bottom, a thick pipe is attached to the top and bottom, and the upper structure and the lower bottom are connected to each other. At this time, a large radius is provided at a contact portion between the bottom plate and the side wall, and the bottom plate is rounded to improve strength. This pipe can be easily used for heating and cooling by passing cold or hot air, cold or hot water through it. The pipe may be tapered so that the metal fitting can be easily pulled out at the time of molding, and a horizontal reinforcing member may be formed in addition to the pipe to reinforce the strength of the side wall. Double-walled boxes are reinforced by connecting the bottom of the outer and inner boxes, while deeper boxes are reinforced by connecting the side walls horizontally.

The pipe-shaped reinforcing member is not uniform in thickness, but, for example, forms a concave portion in an arc shape along the circumference of the rod, and forms a thick portion in the pipe-shaped reinforcing member welded to the portion. Thus, the compressive strength can be increased. The thick part is provided at three to eight places on the circumference, and the thick part of the arc is at least twice the normal thickness. A metal plate that reaches from side to side is attached to the mold to make a plate-shaped reinforcement. At this time, the powdered plastic adheres to both sides of the metal plate, and the reinforcement is two sheets with a gap of the thickness of the metal plate Plate. And for this reason, it becomes what was excellent in compressibility. This plate-shaped reinforcing body has a thickness of 2 mm or more and an interval of 2 to 2 mm.
It is preferably 10 mm. When a plate-like reinforcing member is formed in a lattice shape in a molded body and bonded to all surfaces, when an impact is applied, the stress is propagated and dispersed to the entire molded body, so that it becomes extremely strong. This molded article is characterized by being lightweight and strong. Now, 500 × 500 × 500mm
Let's think about the molded body. This molded body is
It is made with 5,10mm thickness, and it is 5,10,25mm
Four pillars having inner diameters of 1, 3, 5 and 10 mm in thickness are provided at equal intervals. The distance between the columns is about 170mm,
In general, this level seems to be optimal for strength reinforcing performance. The weight of this compact, the weight of the struts, the total weight and the apparent density are shown in Table 1. It is usually difficult to produce a molded body with a thickness of 1 mm by rotational molding, but it may be possible in the future. A wall thickness of 3 to 7 mm is common. When this molded body is molded with a polyolefin having a density of 1 (g / cc) to a thickness of 3 mm, it becomes a molded body of about 4 kg without supporting columns. When four columns having the same thickness are erected, the weight increase is 94 to 471 g, and even if a column having a diameter of 25 mm is erected, the increase in weight is about 10%. And, as shown in Experimental Example 1, the increase of the compressive strength when the support is set up is 10 times or more, and is equivalent to a 5 mm-thick molded body without the support. From this, it can be seen that a molded body with reinforcement is a new method of producing a lightweight and strong molded body. In this molded body, the compressive strength is strong in the direction in which the columns are erected, and there is of course no effect in directions different by 90 degrees. So to strengthen the whole, not only up and down,
It is necessary to make reinforcements on the front, back, left and right. The reinforcing body is not limited to being formed only in a pipe shape, but a plate-like reinforcing body can be manufactured by putting an iron plate in a mold. 500 × 500 in this mold
Two 5 mm × 5 mm iron plates are formed in a cross shape, and the welded one is put in and molded. Since the powdered plastic is melted and joined to both sides of the iron plate, two reinforcing plates are formed in the molded body at an interval of 5 mm in thickness of the iron plate. Table 2 shows the weight and apparent density of this molded product. In this molded product, the apparent density is slightly larger than when four pipe-shaped reinforcements are provided. However, the molded body has excellent strength because all six surfaces are firmly connected by the reinforcing body. Since the reinforcement by the iron plate becomes two plates separated by the thickness of the iron plate, the strength is excellent also from that surface. Although both ends of the space between the two plates can be opened or closed, it is usual to close the space because it is stronger in terms of strength. Further, the box and the support of the molded body can be made of a foamed material. The strength of a plastic foam is usually 1 / (expansion ratio) and the material strength is twice that of a double-foamed one, but the thickness is doubled if the same weight of material is used. And, in the case of a flat plate having twice the thickness, the bending strength is usually eight times the cube of the plate thickness. Therefore, even if the material strength is reduced to half due to foaming, the sheet becomes four times as large as the original sheet. Further, the bending strength is enhanced by the square of the plate thickness. And since this foaming is made into the range of 1.2 to 4 times of a spherical bubble, it has little hygroscopicity and is preferable also from the viewpoint of impact strength. In addition, foaming improves the heat insulating property, has an effect of forming irregularities on the inner surface of the molded body, and increasing the surface area.
In the case of a cube or a shape close to the cube, it is preferable to form a reinforcing body in a lattice shape with an iron plate, and in the case of a thin plate-like body, it is preferable to stand the pipe-shaped reinforcing body in the thickness direction. In any case, foaming into a thick reinforcing body is advantageous for improving the impact resistance of the molded body.

For an embankment material showing an application example of this molded product, the size is 500 × 1000 × 2000 mm and the thickness is 3 mm.
A three-fold foamed molded article of polyethylene is used, and a 5-mm iron plate formed into a lattice at 250 mm intervals is placed in a mold and molded. Then, the radius of the connection between the mold and the reinforcement is 3
mm, and make two recesses with a width of 10 mm, a length of 30 mm, and a depth of 30 mm at right angles to the sides at 50 mm from the eight corners, and put a 10 × 60 × 60 mm wooden board here for use. The structure will be connected with the embankment material. Since the upper and lower parts of the reinforcing material of the embankment material are not sealed, water can flow, the ground is stable, there is no deviation, and the compressive strength is excellent. The apparent density of this embankment material is 0.018 g / cm
It was extremely light.

A plate-shaped reinforcing member having a thickness of 5 mm and a width of 200 mm is attached to a 1000 × 2000 × 200 mm floating pier mold in a grid at intervals of 250 mm and formed into a thickness of 5 mm. Hooks are embedded in the upper four corners of this molded body so as to be connected to the adjacent floating pier. This floating pier has an area /
Thickness is 1000, stable on water, and excellent in buoyancy performance. In addition, since there is a reinforcing body in a lattice shape, it is strong against bending deformation,
Since it uses an antioxidant and an ultraviolet absorber, it has excellent weather resistance, and is lightweight, inexpensive and easy to connect. The floating pier has an apparent density of 0.13 g / cm and preferably has an area / thickness of 500 or more in order to be stable on water.

The baseball stadium fence is 1000 × 2000 ×
50mm in size, 3mm in thickness and 50mm in height
and a corrugated plate having a width of 100 mm and a width of 100 mm. 7 rows in 3 rows
A total of 21 pipe-shaped reinforcements having a diameter of 10 mm and a thickness of 3 mm are attached to the valleys of the corrugated sheet. Two nuts are embedded in the back of this fence. This fence is lightweight, inexpensive, easy to assemble and disassemble, has a high height and a wide hem, so it can cope with a wide range of impact force and has excellent shock absorption. Also, instead of a corrugated plate, a mountain-like projection can be formed.

As a surface material of a circular table, a diameter of 2000 is used.
mm, a plate thickness of 50 mm, a wall thickness of 5 mm, a diameter of 10 mm,
37 pipe reinforcements 5 mm thick are formed concentrically. On the back side of this board, width 100mm, height 50mm, thickness 5m
A thick portion of m extends through the center to the end in eight directions, and a structure in which the base of the protruding portion of the thick portion is closed is provided so as to obtain excellent bending strength. In this plate, four metal fittings are embedded near the back surface, and the whole metal fitting is covered with plastic so that it can be firmly connected to the legs. This table is a light-weight, inexpensive, and particularly strong molded body at the end.

The pallet is 1100 × 1100 × 200 m
m and a plate thickness of 5 mm. 1100 × 200mm
There is no plate on the two opposite sides, and there are plates on the other two sides,
Two plate-shaped reinforcing members of 5 mm are formed at an interval of 5 mm in the middle of the temporary side surface. This pallet is lightweight, inexpensive, has good weather resistance, has excellent compressive strength due to the presence of a reinforcement in the middle, and can be used on both upper and lower surfaces. Then, the pallets having a high compressive strength are divided into two sets at 150 mm apart from the central reinforcing member, and the reinforcing members are formed at 150 mm apart from both side surfaces.

Inner box 1000 × 1000 × 1000 mm,
Outer box 1100 × 1100 × 1100mm, skin thickness 7m
m was made of a material foamed twice as much as polyethylene, and a 30-fold foamed polyethylene foam was filled between the inner box and the outer box. The inner box and the outer box were connected by attaching four reinforcing pipes each having a diameter of 25 mm in four rows to the bottom of the heat insulating box, and the inner box and the outer box were sealed, and both ends were sealed and finished smoothly. Even if this insulation box is used for a long period of time, the insulation board of the bottom panel will not be compressed and thinned, and the insulation will not be reduced at all. It was excellent.

The windsurfboard is made of 1.5 times the foam of polyethylene, and its bottom and side surfaces are connected by 1 unit.
It is made of a pipe-shaped reinforcement having a diameter of 10 mm and a thickness of 5 mm at intervals of 00 mm. Attach a triangular rudder to the back of the bottom,
Two metal fittings for erecting the pole are embedded in the upper part of the bottom. This wind surf inboard is lightweight, easy to carry and made of inexpensive and foamed material, so it has strong impact strength, excellent weather resistance, and extremely excellent moldability that can be molded in one shot. .

As a water supply tank placed in a place where traffic is inconvenient, four 1050 × 1000 × 50 mm heat insulating plates and 11
Assemble with one 00 × 1100 × 50 mm heat insulating plate.
Make a reinforcement frame with an iron angle, make the larger board the bottom,
The four smaller plates are set as side surfaces on this. A packing made of water-expandable rubber is inserted where the plates come into contact with each other, a bolt hole is made in the iron angle, and the bolts press the contact portion of the heat insulating plate. Since this tank was of an assembling type, the transportation cost was low, the workability was excellent, and the tank did not leak. In this method, four heat insulating plates are used on one side, and a total of 20 heat insulating plates can provide a tank eight times larger. It is also possible to make a tank lid with a heat insulating plate.

1000 × 4000 × 100 mm, thickness 1
50mm diameter, 10m thick on a 0mm plate for suspension bridge
A total of 80 pipe-shaped reinforcements of 19 m in 4 rows, 76 in total and 1 in each of the four corners were made. At the joint of this board, 10
00 × 300 × 100mm plate with 50mm diameter at four corners,
An auxiliary plate having a pipe-shaped reinforcement body with a thickness of 10 mm is applied in the same manner as the main body, and the holes of the plate for the suspension bridge and the holes of the auxiliary plate are overlapped and connected to the suspension cable through a rope. This suspension bridge is lightweight and strong, has low transportation costs, is easy to disassemble and assemble, has good weather resistance, and has little swing.

The floor material for aircraft and the Shinkansen is a foam 1.5 times as large as polyethylene, 500 × 500 × 10 mm, and the thickness of the upper and lower surfaces is 5 mm. Four pipe-shaped reinforcing members having an inner diameter of 10 mm and a thickness of 5 mm are erected on the molded body in four rows. Since the interval between the reinforcing pipes is about 90 mm and the interval is short, it can withstand a local load such as high heels. The lower plate of this molded body has no material except for a part of the reinforcing pipe having a width of 50 mm. And the absence of this material extends to the sides, through which cables can be routed. The flooring is lightweight, durable, has good insulation, and has excellent elastic properties so that it does not injure if a person falls.

The small-sized combined septic tank is made of a polyethylene foam having an inner diameter of 1000 mm, a length of 2,000 mm and a thickness twice as large as 12 mm, and is formed into two pieces, and is formed into a cylindrical shape. This septic tank is divided into four sections with 12 mm-thick partitions, and there are many 3 mm-thick plates in each section, and the structure is such that the liquid flows out of each section one by one to lengthen the flow path. . This septic tank has a lot of compartments and partitions, so it is durable, made of foam, and can keep the liquid temperature inside high,
The surface of the inner wall has irregularities, and it is lightweight and has excellent workability.

A plate of 1000 × 2000 × 25 mm having a gourd-shaped protrusion on two sides and a concave portion corresponding to the two sides is made. When an adhesive or a sealing material is used to join the uneven portions, the joining is easy and the material has nectarity, so that it is suitable as a roof material for a building roof.

In this molding method, the granular material which is crosslinked and foamed together with the powdered plastic is subjected to rotational molding, and a 30-fold foam material is put into the molded product to form a heat insulating material. When the skin and the core are made of the same material, it is easy to regenerate. Also, by adding one or more materials such as shirasu balloons, polystyrene foam granules, open-cell foams, glass fibers, thin metal pieces, and bent pieces thereof to the molded body It is also possible to use a sound absorbing material. The sound-absorbing material has many small holes on the upper and lower plates. There are holes on one side of the plate and both holes on the plate. In the case of granular materials such as polystyrene foam, thin metal pieces, or bent pieces thereof, holes are made in both of them to allow sound to pass therethrough, thereby converting sound energy into kinetic energy of the sound absorbing material to absorb sound. Various sound-absorbing media are inserted into the molded body by making holes, and then the sound-absorbing medium is inserted, and the holes are closed and repaired. The compact has holes in one or both of the reinforcements. (In both cases, the holes communicate with each other, but in one case, of course, the holes do not.) Then, when the characteristics of the holes decrease, the plug is closed, or the material is sealed with molten plastic.

In the present invention, a projection and a recess may be formed on a molded body to couple the molded bodies. A hole may be formed instead of the concave portion for coupling. An arc-shaped protrusion may be formed on the convex portion, and a concave portion may be formed on the concave portion for fitting the convex portion, thereby strengthening the connection and watertightness. Further, a screw may be provided in the convex portion and the concave portion, and the screws may be connected by this.

In the present invention, there is a case where fastening members such as bolts and nuts are embedded in the molded body, and the molded body is connected thereto accordingly. At this time, the metal fitting is embedded in a portion of the molded body as close to the skin as possible, and the metal fitting is covered with the skin material to improve the strength.

In the present invention, there is a case where a hole is formed in a molded body, a bolt is passed through the hole, and the molded body is fixed to a support such as an iron frame for use. At this time, rubber, water-swelled rubber, plastic foam or the like is placed between the molded body and the surface of the iron to make it watertight.

When attaching a plate-shaped reinforcing member to a mold, a metal plate is welded to the inside of one plate. This plate is formed at an appropriate interval so as not to be in contact with the other plate, and is formed so that the powdered plastic can be moved by rotation. The formed reinforcing body is connected to the plate-like body.

In this molding, the thickness of the mold is 2 to 4 m.
m or a sheet metal processed about 10 m thick
m aluminum casting. Heating temperature is 160-280
And the heating time is 20 to 40 minutes. Cooling is performed by rotating around 100 ° C. to gradually cool while maintaining a uniform temperature, and then cooling to room temperature. At this time, the molded body is likely to be deformed unless cooled slowly. The plastic material used is not particularly limited as long as it is a powder of polyethylene, polypropylene, ABS, nylon, polycarbonate, acrylic resin, etc., but is preferably polyethylene, and in particular, linear low density polyethylene (LLDPE) is preferable because of its good moldability. .
It is particularly preferable that the density is 0.93 to 0.95 g / cm ³ and the MI is 2 to 6. The particle size of the plastic powder is about 0.1 mm, and the particle size of the mixture of the compounding agents may be about 1 mm. In addition, a sphere-like shape having no beard is easy to mold. In the present invention,
A material having different particle diameters or two or more materials can be put into a mold and subjected to rotational molding to produce a molded product composed of two or more layers.
The difference between the particle diameters is usually three times or more the average particle diameter. For example, it is possible to form a two-layer molded body having good weather resistance and strength by forming a thin layer on the surface layer with a material having a fine particle diameter and good weather resistance and combining with a material having a large particle diameter and strength.
Particles with a large particle size adhere to the inner surface of the molded body, but this material does not have to be plastic, and particles of thermosetting resin, particles of cross-linked plastic, particles of gravel, and inorganic compounds such as calcium carbonate should be adhered. Can be. The rotation of the mold is biaxial rotation or swing rotation, and the rotation speed is 1 to
20 rpm. In the present invention, there is a case where a heat insulating material is stuck to a mold and molded, and the thickness of the portion is reduced or the material is not used. In some cases, a metal plate or a foil is put into a mold and molded, and a molded article having these is formed on the surface of the molded article. According to the present invention, a molded article which is lightweight and inexpensive and has remarkably excellent compressive strength, shear strength, bending strength and impact strength as compared with other molded articles can be produced. It can be widely used for surface materials, pallets, building forms, floating boards, boats, ground stabilizing materials, etc. In the present invention, a flame retardant can be obtained by blending a flame retardant with the plastic powder. Strength can be enhanced by blending glass fiber and carbon fiber. Then, carbon black or an antistatic agent may be added. Also, a layer of EVA or the like is formed on the surface to make the surface smooth, rough or slippery,
The surface can be embossed to impart a decorative property and painted. Next, examples of the present invention will be described. Example 1 A hole was made at the center of the upper and lower plates of a 200 × 200 × 25 mm mold and the middle of a line connecting the center and the corner,
Pass 5 bolts of 10mm through this and insert L into this mold.
LDPE (density 0.94 g / cm ³ , MI4) 200 g
Is fixed with a nut, and the mold is heated at 200 ° C. for 30 minutes while rotating at a rotation speed of 10 rpm and an oscillating rotation speed of 6 rpm in a hot-air constant temperature bath. Then, the temperature of the thermostat was raised to 100 ° C., and the same rotation was repeated as above.
Cool slowly for a minute and then cool to room temperature. The obtained molded body is a 2 mm-thick skin and the upper and lower plates are connected by a 2 mm-thick pipe-shaped reinforcing body, and the portion where the upper and lower plates and the pipe-shaped column are joined to each other. The material was swelled and the radius was 2 mm. The molded article has an apparent density of 0.2 g / cm ³ and a compressive strength of 9.3 kgf / cm 3.
² were those very superior compressive strength 0.31Kgf / cm ² without molded article having reinforcing pipe in the same way with the same thickness. [Example 2] In the center of a mold of 380 x 50 x 19 mm, holes of 5 mm in diameter were drilled at equal intervals at two locations in two rows, bolts were passed therethrough, LLDPE was charged, and molding was performed in the same manner as in Example 1. did. In the obtained molded body, the upper and lower plates are connected by a pipe, the radius of this joint is 2 mm, the bending strength is 4.52 Kgf / cm ² , and the bending strength of the molded body of the same shape without the reinforcing body Of 1.81 kgf / cm ² . [Effects of the Invention] As described above, a molded body having a skin on two parallel surfaces and a reinforcing body standing upright is lightweight, has a large compressive strength, a shear strength, a bending strength, and an impact strength, and has a structure. It can be used as a material. A sound absorbing material is placed in the cavity of the molded body, and small holes are formed in the upper and lower surfaces of the molded product. The sound absorbing material is lightweight and strong, and is extremely useful. In particular, this structure has excellent moldability,
Since it is made of thermoplastic plastic that can be molded in one step, it is a resource-saving structure that can be recycled. Since this molded body is lighter and stronger than any material, it is extremely useful as a welfare-related appliance and furniture in high demand, such as walking equipment for the physically handicapped and the elderly.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a molded body composed of a skin and a reinforcing body.

FIG. 2 is a cross-sectional view of a sound-absorbing material including a perforated skin and a reinforcing member, in which a sound-absorbing material is inserted.

[Explanation of symbols]

 (1) Skin (2) Reinforcement (3) R (R) (4) Sound absorbing material (5) Small hole

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C02F 3/00 B29K 105: 04 // B29K 105: 04 B65D 81/08 (72) Inventor Akira Kitaichi Kanagawa 2-33-6 Seya, Seya-ku, Yokohama (72) Inventor Susumu Nakano 806, Rokuura-cho, Kanazawa-ku, Yokohama-shi, Kanagawa F-term (reference) 3E066 AA21 BA02 CA01 CA11 CB02 DA01 EA02 LA16 MA01 4D027 AB01 AB12 4F205 AA04 AA11 AA13 AA21 AA28 AA29 AB05 AB09 AB25 AC04 AD02 AD03 AD04 AD08 AD12 AG20 AG28 AH02 AH43 AH48 AH55 AH59 GA01 GB01 GB12 GB22 GC04 GF05 GN01

Claims (36)

[Claims] 1. A pipe-shaped or plate-shaped reinforcing member is connected and integrated from one surface to an opposite surface of a plastic molded body having two parallel surfaces to improve compressive strength, shear strength, bending strength and impact strength. Molded plastic. 2. The method according to claim 1, wherein the material is nylon,
Molded body composed of ABS, polypropylene, polyethylene, polycarbonate, acrylic resin, etc. 3. The molded article according to claim 2, wherein the foamed material is used. 4. The molded article according to claim 2, wherein two or more kinds of materials having different particle diameters are used and two or more layers are formed. 5. A molded article formed by mixing a flame retardant, an antistatic agent, glass fiber, carbon fiber, etc. with powdered plastic. 6. The method according to claim 1, wherein the reinforcing member is 3 to 12 parts.
A method using a pipe having an inner diameter of 2 mm and a wall thickness of 2 mm or more. 7. The method according to claim 1, wherein two reinforcing plates having a thickness of 2 mm or more and a spacing of 2 to 10 mm are used. 8. The molded article according to claim 1, wherein the molded article is reinforced in the thickness direction of the flat molded article. 9. The molded article according to claim 1, wherein a reinforcing body is formed in two or three directions of the thick flat molded article. 10. A molded article according to claim 1, wherein the reinforcing bodies are formed in one direction above and below the sphere, two directions horizontally, and four oblique directions. 11. A molded article according to claim 1, wherein pipes are erected radially from the inside to the outside of the annular molded article or the combined annular molded article. 12. A molded body in which a thick pipe-shaped reinforcing member is attached in the center of a vertically long tank in the axial direction, and connects an upper structure and a bottom plate. 13. The molded article according to claim 1, wherein the double bottom of the double-walled tank is connected by a reinforcing member. 14. A molded article in which the inside of the plastic molded article having the reinforcing body according to claim 1 is filled with a foam. 15. A sound-absorbing material in which a sound-absorbing material is placed inside a plastic molded article having a reinforcing body according to claim 1, and small holes are formed in one or both of upper and lower skins. 16. A molded article according to claim 1, wherein the surface of the molded article is corrugated or mountain-shaped. 17. A molded product according to claim 1, wherein a metal plate or a metal foil is placed in a mold, and the metal plate or the metal foil is adhered to the surface of the molded product. 18. The molded article according to claim 1, wherein a plate-like body is provided in a lattice shape as a reinforcing body. 19. The molded article according to claim 1, wherein a portion where the reinforcing member is joined to the upper and lower skins is rounded. 20. The molded article according to claim 1, wherein a thin part and a thick part are combined in the thickness direction of the reinforcing body. 21. The molded article according to claim 1, wherein the plate-shaped body is given a change in thickness to enhance bending strength. 22. The method according to claim 1, wherein the upper and lower sides of the formed plate are connected by a pipe-shaped or plate-shaped reinforcing member, and both ends of the pipe-shaped and plate-shaped reinforcing members are closed or opened, or one end is closed. , A molded body with one end open. 23. The method according to claim 1, wherein a concave portion is formed at a corner of the molded body, a common plate-like body with an adjacent molded body is inserted therein, and mutually connected. 24. The method according to claim 1, wherein a protrusion and a recess, a protrusion and a hole, a male screw and a female screw are formed in the molded body, and the molded body is connected by fitting. 25. The method according to claim 1, wherein a protruding portion and a concave portion are formed in the molded body, and an arc-shaped protrusion and a dent are formed and connected to each other. 26. The method according to claim 1, wherein a fastening member is embedded in the molded body, and the molded body is thereby joined. 27. The method according to claim 1, wherein a hole is formed in the molded body,
A method in which bolts are passed through and connected to the support. 28. The molded article according to claim 1, wherein an adhesive or a sealing material is applied to a joint of the molded article having a projection and a recess. 29. The flooring material according to claim 1, wherein the distance between the reinforcing members is 150 mm or less. 30. The flotation material according to claim 1, wherein the apparent density of the molded article is 0.2 g / cc or less and the area / thickness is 500 or more. 31. A disk-shaped molded body according to claim 1, wherein the reinforcing bodies are arranged concentrically. 32. The method according to claim 1, wherein the device has two parallel surfaces,
There is no plate on the two opposite sides, and there are plates on the other two sides,
A pallet with a plate-shaped reinforcement in the middle between the two side plates. 33. The surfboard for windsurfing according to claim 1, wherein a metal fitting for setting up a pole is embedded in the bottom plate. 34. An assembling container according to claim 1, wherein a plate-like body is disposed on a bottom and side surfaces of a threaded iron frame, and pressure is applied to a contact portion with a bolt to form an airtight structure. 35. The method according to claim 1, wherein a plate having holes at four corners is formed, and a connecting auxiliary plate having holes similar to the main body at the connecting portion is used. Suspension bridge connected to the cable. 36. The septic tank according to claim 1, wherein the septic tank is made of a plastic foam.