JPH0659366U - Paper tube - Google Patents

Abstract

(57) [Summary] [Purpose] To reinforce the strength of paper tubes. [Structure] A line in which an outer surface 11 and an inner surface 12 intersect a surface 14 perpendicular to a longitudinal direction 13 of a tube is a quadrangle, and an outer paper tubular member 1 impregnated or coated with a synthetic resin, and the outer paper tubular member 1 An outer surface 21 is fixed to the inner surface 12, and the outer surface 21 and the inner surface 22 are arranged in the longitudinal direction 13
A paper tube having a circular line intersecting with a surface 14 perpendicular to the inner surface and a tubular member 2 made of an inner paper impregnated or coated with a synthetic resin.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paper tube, and more particularly to a paper tube having improved strength.

[0002]

[Prior art]

 Conventional paper tubes are used as the core of packaging materials. This paper tube is made by wrapping an elongated paperboard in a spiral shape into a tubular shape and impregnated with a synthetic resin. It is required to reinforce the strength of this paper tube. FIG. 7 shows the front of the conventional example of this reinforced paper tube, and FIG. 8 shows the side of this conventional example. In FIGS. 7 and 8, the inner tubular member 8 is arranged so as to be inscribed in the outer tubular member 7. The line intersecting with the outer surface 71 and the inner surface 72 of the outer tubular member 7 perpendicular to the longitudinal direction 73 is circular. Further, the line intersecting the surfaces of the outer surface 81 and the inner surface 82 of the inner tubular member 8 perpendicular to the longitudinal direction 73 is also circular. Therefore, the outer surface 81 of the inner tubular member 8 is inscribed on the entire inner surface 72 of the outer tubular member 7. The outer tubular member 7 and the inner tubular member 8 are spirally wound paperboard (paper tube base paper, cardboard, etc.).

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional example, the strength of the paper tube is not sufficient because the thickness of the paper tube (the distance between the outer surface and the inner surface) is increased simply by forming the paper tube into two layers. Therefore, it was not possible to use the paper tube as a reinforcing material inside the container to which a large force is applied. Therefore, an object of the present invention is to eliminate the drawbacks of the above-mentioned conventional example and to provide a paper tube having sufficient strength.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the first structure of the present invention is that the outer and inner surfaces have a quadrangular line intersecting the plane perpendicular to the longitudinal direction of the pipe and the outer paper tubular member is impregnated or coated with synthetic resin. And an outer surface fixed to the inner surface of the outer paper tubular member, and a line where the outer surface and the inner surface intersect the plane perpendicular to the longitudinal direction is circular, and the inner paper tubular member impregnated or coated with synthetic resin is It is a paper tube equipped with. In the second aspect of the present invention, the outer and inner surfaces have circular lines intersecting the plane perpendicular to the longitudinal direction of the pipe, and the outer paper tubular member is impregnated or coated with synthetic resin, and the outer paper tubular member. A paper tube provided with an inner paper tubular member having an outer surface fixed to the inner surface of the member, and a line where the outer surface and the inner surface intersect the surface perpendicular to the longitudinal direction is polygonal, and a synthetic resin is impregnated or coated with the inner paper tubular member. Is.

[0005]

[Action]

 In the paper tube of the first configuration, the line intersecting the plane perpendicular to the longitudinal direction of the outer tubular member is a square inner surface, and the line intersecting the plane perpendicular to the longitudinal direction of the inner tubular member is a circular outer surface. Since substantially triangular wall surfaces are formed at the four locations, the strength of the paper tube not only in the longitudinal direction but also in the direction perpendicular to the longitudinal direction is sufficiently reinforced. Also in the paper tube of the second configuration described above, the line intersecting the plane perpendicular to the longitudinal direction of the outer tubular member is a circular inner surface, and the line intersecting the plane perpendicular to the longitudinal direction of the inner tubular member is a polygonal outer surface. As a result, a dome-shaped wall with a flat bottom is formed at multiple locations, so that not only the longitudinal direction of the paper tube but also the strength in the direction perpendicular to the longitudinal direction is sufficiently reinforced.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a front view of a first embodiment of the present invention, and FIG. 2 shows a side surface of the first embodiment. In FIGS. 1 and 2, the inner tubular member 2 is inscribed in the outer tubular member 1 and is fixed by impregnation with a synthetic resin or the like. The line intersecting the outer surface 11 and the inner surface 12 of the outer tubular member 1 with the surface 14 perpendicular to the longitudinal direction 13 of the tube is a quadrangle. The line intersecting with the surface 14 of the inner tubular member 2 which is perpendicular to the longitudinal direction 13 of the outer surface 21 and the inner surface 22 is circular. The outer tubular member 1 and the inner tubular member 2 are formed by spirally winding a paperboard (paper tube base paper, cardboard, etc.). The paper tube of this example has a length in the longitudinal direction of 500 mm to 3 m, a diameter perpendicular to the longitudinal direction of 20 to 200 mm, and a thickness in the radial direction of 1 to 5 mm. Further, the outer tubular member 1 and the inner tubular member 2 are impregnated or coated with a synthetic resin. In this case, a penetrating water-soluble acrylic or organic solvent (for example, styrene) adhesive is used as the synthetic resin. After impregnation or coating with the synthetic resin, it is dried. If a water-soluble acrylic adhesive is used, it is dried by force to improve workability. If an organic solvent adhesive is used, a desulfurization unit is required if forced drying, so naturally dry it. When the water-soluble acrylic adhesive is used, the paper tube can be used again as a raw material for paper.

With the above configuration, the flat inner surface 12 of the outer tubular member 1 and the arcuate outer surface 21 of the inner tubular member 2 are joined together, so that substantially triangular wall surfaces are formed at four locations. Can withstand greater stress than the example. Further, since the stress is dispersed along the outer surface 21 of the inner tubular member 2, it is possible to endure a larger stress. Therefore, a paper tube having a cross section perpendicular to the longitudinal direction of 30 mm square can withstand a force of several hundred kilograms in the longitudinal direction of the paper tube. Even in the direction perpendicular to the longitudinal direction, it can withstand a force of several tens of Kg to 100 Kg and is hard to be crushed. Therefore, it can withstand 5 to 10 times the force of the conventional example. The paper tube of this example can be used not only as a core of a packing material but also as a reinforcing material, and can also be used as a pillar that supports four corners of an internal pallet of a marine container that houses a knockdown part of a car, for example. is there. Further, the paper tube of this example has a quadrangular line where the outer surface 11 of the outer tubular member 1 intersects with the surface 14 perpendicular to the longitudinal direction 13 of the tube, so that it fits well inside the container and is suitable for the column. Furthermore, the wood that has been conventionally used as a prop in a container emits acid gas (woodic acid), which causes rust on metal parts inside the container (especially pressed parts before rust prevention treatment), and this wood It was necessary to smoke the container because harmful insects parasitize it, but the paper tube becomes neutral due to the coating of synthetic resin, etc. There is no need to smoke the container, as it does not cause rust on the parts and is unrelated to pests. Moreover, the paper tube is significantly lighter than wood.

FIG. 3 shows a front surface of a second embodiment of the present invention, and FIG. 4 shows a side surface of the second embodiment. 3 and 4, the inner tubular member 4 is inscribed in the outer tubular member 3 and is fixed by impregnation with a synthetic resin or the like. The lines of the outer surface 31 and the inner surface 32 of the outer tubular member 3 which intersect the surface 34 perpendicular to the longitudinal direction 33 of the tube are circular. The line intersecting the surface 34 of the inner tubular member 4 which is perpendicular to the longitudinal direction 33 of the outer surface 41 and the inner surface 42 is a quadrangle. Others are the same as those in the first embodiment. With the above configuration, the arcuate inner surface 32 of the outer tubular member 3 and the flat outer surface 41 of the inner tubular member 4 are joined together, so that a wall surface having the outer surface 41 as the bottom surface and the inner surface 32 as the dome is formed. Since it is formed at four places, it is possible to withstand a larger stress than the above-mentioned conventional example. The paper tube of the second embodiment is suitable for a core material, a winding bobbin, etc. because the line where the outer surface 31 of the outer tubular member 3 intersects the surface 34 perpendicular to the longitudinal direction 33 is circular.

FIG. 5 shows a front surface of a third embodiment of the present invention, and FIG. 6 shows a side surface of the third embodiment. In FIGS. 5 and 6, the inner tubular member 6 is inscribed in the outer tubular member 5 and is fixed by impregnation with a synthetic resin or the like. The lines of the outer surface 51 and the inner surface 52 of the outer tubular member 5 which intersect the surfaces 54 perpendicular to the longitudinal direction 53 of the tube are circular. The line intersecting the surface 54 of the inner tubular member 6 which is perpendicular to the longitudinal direction 53 of the outer surface 61 and the inner surface 62 is a triangle. Others are the same as those in the first embodiment. With the above configuration, since the arcuate inner surface 52 of the outer tubular member 5 and the flat outer surface 61 of the inner tubular member 6 are combined, the outer surface 61 is the bottom surface and the inner surface 52 is the dome-shaped wall surface. Are formed in three places. Therefore, the paper tube can withstand greater stress than the conventional example. Further, since the outer surface 51 of the outer tubular member 5 intersects with the surface 54 perpendicular to the longitudinal direction 53 at a circular line, the paper tube can be used as a core material or a bobbin.

[0010]

[Effect of device]

 As described in detail above, according to the paper tube of the present invention, the strength of the paper tube can be sufficiently reinforced in a lightweight state. For this reason, the use of the paper tube can be expanded not only to the core material but also to the place where the strength of the internal reinforcing material of the container is required. Furthermore, the paper tube does not cause corrosion of the metal, so it does not cause corrosion of the metal products loaded in the container. Moreover, since the paper tube is not affected by pests, it is not necessary to smoke the paper tube inside the container.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment of the present invention.

FIG. 2 is a side view of the first embodiment.

FIG. 3 is a front view of the second embodiment.

FIG. 4 is a side view of the second embodiment.

FIG. 5 is a front view of the third embodiment.

FIG. 6 is a side view of the third embodiment.

FIG. 7 is a front view of a conventional example.

FIG. 8 is a side view of the conventional example.

[Explanation of symbols]

 1, 3, 5, outer paper tubular member 2, 4, 6 inner paper tubular member 11, 21, 31, 41, 51, 61 outer surface 12, 22, 32, 42, 52, 62 inner surface 13, 33, 53 Longitudinal direction of pipe 14, 34, 54 A plane perpendicular to the longitudinal direction of pipe

Front page continued (72) Inventor Noboru Ogata No. 1 Toyota-cho, Toyota City, Aichi Prefecture Toyota Automobile Co., Ltd. (72) Inventor Shigenao Sasaki 822 Nagasuga, Tomita-cho, Nakagawa-ku, Aichi Prefecture Asahi Container Industry Co., Ltd. In the company

Claims (2)

[Scope of utility model registration request] 1. An outer paper tubular member impregnated or coated with a synthetic resin, and a line having outer and inner surfaces crossing a plane perpendicular to the longitudinal direction of the tube are quadrangular, and an outer surface on the inner surface of the outer paper tubular member. A paper tube, which is fixed and has an inner paper tubular member impregnated with or coated with a synthetic resin, in which a line whose outer surface and inner surface intersect with a surface perpendicular to the longitudinal direction is circular. 2. An outer paper tubular member impregnated or coated with a synthetic resin, the outer surface and the inner surface of which are intersecting with a surface perpendicular to the longitudinal direction of the tube in a circular shape, and an outer surface of the outer paper tubular member on the inner surface. A paper tube which is fixed, and has an inner paper tubular member impregnated or coated with a synthetic resin, wherein a line whose outer surface and inner surface intersect the surface perpendicular to the longitudinal direction is polygonal.