JPH05353Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a composite tube used as a bobbin for winding filament, thread, roving, etc., and as a winding core for winding plastic film, metal foil, paper, etc.

Prior Art and its Problems Conventionally, paper tubes and fiber reinforced plastic (hereinafter referred to as FRP) tubes have been used for bobbins and winding cores. However, in the case of paper tubes, there has been a problem that their properties such as strength, water resistance, moisture resistance, abrasion resistance, impact resistance, gas barrier resistance, etc. are not sufficient. Further, when a paper tube is used as a bobbin or a winding core, there is a problem that the tube becomes deformed when it is forcibly fitted onto a spindle. In addition, in the case of FRP tubes, the above-mentioned problems of paper tubes can be solved, but they are heavy, expensive, burn a lot of calories when burning waste and cause pollution, and do not have sufficient insulation properties. There were also problems such as insufficient light-shielding properties.
Additionally, when FRP tubes are used for bobbins and winding cores, there is a problem in that they resonate and generate noise when rotated.

The purpose of this invention is to provide a composite tube that solves the above problems.

Means for Solving the Problems The composite cylinder according to this invention consists of a fiber-reinforced plastic cylinder part and a paper cylinder part formed by wrapping paper around the outer periphery of the fiber-reinforced plastic cylinder part,
The paper tube portion and the fiber-reinforced plastic tube portion are bonded together through an adhesive layer formed of paper wrapped around the outer periphery of the fiber-reinforced plastic tube portion and made of the same resin as the resin forming the fiber-reinforced plastic tube portion. Both end surfaces and the outer peripheral surface of the paper cylinder are covered with a coating film.

In the above, as the fiber reinforcing material in the FRP cylinder part, synthetic resin fibers such as polyester fibers and Tetron fibers, cloths such as glass fibers, carbon fibers, and boron fibers, rovings, mats, and blind weaves are used. Thermosetting resins such as unsaturated polyester resins, epoxy resins, vinyl ester resins, and polyimide resins are used as the plastics forming the FRP cylinder.
If the fiber reinforcing material and thermosetting resin of the FRP cylinder are colored, the resulting colored pattern will enable them to be identified when used in bobbins, winding cores, etc. The thickness of the FRP tube is determined depending on the use of the composite tube, mainly considering strength.

The paper tube portion is formed by winding, for example, a band-shaped paperboard, kraft paper, paper tube base paper, etc. in a spiral shape or by flat winding around the outer periphery of the FRP tube portion. The thickness of the paper tube portion is appropriately determined in consideration of the use of the composite tube. The thickness of the paper tube portion can be changed by changing the thickness of paperboard, kraft paper, paper tube base paper, etc., or by changing the number of turns, that is, whether it is wound once or twice or more. When wrapping paper in two or more layers, it is best to use adhesive to adhere adjacent parts in the inner and outer directions.

The adhesive that is formed on the paper wrapped around the outer circumference of the FRP tube and that adheres the paper tube and the FRP tube is the FRP
This is for adhering the cylindrical part and the paper cylindrical part with good adhesion.

The coating film is used to prevent the paper tube portion from deteriorating over time due to wetting with water, changes in humidity, and the like. This coating film is preferably formed using a coating material such as polyethylene resin, polypropylene resin, polyester resin, or urethane resin by a method such as injection, dipping, spraying, or brushing.

In addition to bobbins and winding cores, the composite tube of this invention can also be used to cover tubes that require insulation such as rollers of roller conveyors, steam piping, etc., protect cables, sports equipment, reinforcing materials for packaging boxes, and packaging. It can also be used as a cushioning material.

Embodiments Hereinafter, embodiments of this invention will be described with reference to the drawings.

In this embodiment, the composite tube according to this invention is applied to a bobbin for winding filament, thread, roving, wire, etc.

In FIGS. 1 and 2, the composite cylinder 11 is
It consists of an FRP cylinder part 13 and a paper cylinder part 12 that covers the outer peripheral surface of the FRP cylinder part 13, and the outer peripheral surface of the paper cylinder part 12 and both end surfaces of the paper cylinder part 12 and the FRP cylinder part 13 are sprayed with polyethylene. It is covered with a membrane 14.

The paper tube portion 12 is made of four layers of paperboard 15 bonded together with an adhesive. The FRP cylinder part 13 includes a plastic layer 17 made of unsaturated polyester resin,
It consists of a reinforcement 18 consisting of glass fiber rovings embedded within a plastic layer 17. The paper tube portion 12 and the FRP tube portion 13 are made of plastic layer 17.
They are bonded together with an adhesive 16 made of the same type of synthetic resin.

Such a composite cylinder 11 is manufactured, for example, as follows.

First, a release layer is formed on the outer peripheral surface of the mandrel by wrapping a release tape such as a plastic film or by applying a release agent.
Then, three belt-shaped prepregs made of a glass fiber reinforcing material and an unsaturated polyester resin are sequentially wound spirally around the outer peripheral surface of the mandrel. The wrapped prepreg is moved in the axial direction of the mandrel while being rotated by a known belt drive device or the like. Next, four strips of paperboard 15 are spirally wound over the wrapped prepreg. On the inner surface of the innermost paperboard 15, 16 layers of adhesive made of semi-cured unsaturated polyester resin are formed. The 16 layers of adhesive do not have fluidity like a liquid, but are in a state that is not completely cured, that is, a state in which the unsaturated polyester resin is cured to a point slightly beyond the B stage. Such semi-cured unsaturated polyester resin is completely cured by heating. Further, the band-shaped paperboard 15 is coated with an adhesive for bonding the band-shaped paperboard 15 together in advance. Thereafter, this is passed through a heating drying device to harden the unsaturated polyester resin of the prepreg to form the FRP cylinder part 13, and at the same time harden the 16 layers of adhesive on the inner surface of the innermost paperboard 15 to connect the FRP cylinder part 13 and the paper. The cylindrical portion 12 is bonded. Thereafter, it is cut into a predetermined length using a cutting device such as a cutter. Furthermore, the outer peripheral surface of the paper tube section 12, the paper tube section 12 and the FRP tube section 1 are coated by thermal spraying.
A coating film 14 is formed on both end surfaces of 3 and dried. In this way, the composite cylinder 11 is manufactured.

When such a composite tube 11 is used as a bobbin, the elasticity of the paper on the outer peripheral surface is not impaired, so that it is possible to prevent the wound material such as thread from shifting. Also,
This prevents moisture contained in the wrapping material or oil adhering to it from entering the paper tube.

In the above embodiment, the cross-sectional shape of the composite cylindrical material is circular, but the cross-sectional shape is not limited to this, and may be square, triangular, oval, or the like. In addition, in the above embodiment, pre-formed FRP
The paper tube portion may be formed by spirally wrapping paperboard around the outer peripheral surface of the tube.

Effects of the invention The composite cylinder according to this invention is constructed as described above, and due to the presence of the paper cylinder part, the weight is small, the cost is low, and the amount of calories burned is low during waste combustion, thereby preventing the generation of pollution. It has the effect of providing sufficient thermal insulation. Furthermore, the paper tube portion improves performance such as shock absorption, sound absorption, and deformation absorption. Furthermore, the presence of the FRP cylinder improves performance such as water resistance, moisture resistance, abrasion resistance, impact resistance, overall strength, and gas barrier properties. Therefore, the problems of the paper cylinder and FRP cylinder mentioned above can be solved all at once.

Further, the FRP cylinder part and the paper cylinder part are formed of paper wrapped around the outer periphery of the FRP cylinder part, and are attached through a layer of a mounting agent made of the same resin as the resin forming the FRP cylinder part. Therefore, it is possible to prevent a gap from forming between the FRP cylinder part and the paper cylinder part. Without the adhesive layer, gaps may be created between the FRP tube and the paper tube due to the unevenness of the paper surface.

Furthermore, the presence of the coating film can prevent moisture from being absorbed into the paper tube. Therefore, it is possible to prevent the paper tube portion from deteriorating over time due to moisture absorption. Furthermore, if the composite tube becomes dirty, it can also be cleaned.

[Brief explanation of drawings]

The drawing shows an example of a composite tube according to this invention,
FIG. 1 is a longitudinal sectional view, and FIG. 2 is a partially enlarged view of FIG. 1. DESCRIPTION OF SYMBOLS 11...Composite tube, 12...Paper tube part, 13...Fiber-reinforced plastic layer, 14...Coating film, 16...
glue.

Claims (1)

[Scope of utility model registration request] It consists of a fiber-reinforced plastic tube and a paper tube formed by wrapping paper around the outer periphery of the fiber-reinforced plastic tube. It is formed on the paper to be rolled up and is bonded to it through an adhesive layer made of the same resin as the resin that forms the fiber-reinforced plastic tube, and both end surfaces and the outer circumferential surface of the paper tube are covered with a coating film. Composite tube.