JP2010276193A - Method for manufacturing frp pressure vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight vessel excelling in pressure resistance. <P>SOLUTION: A vessel body 10 includes: a first layer 110 of hollow shape formed of polyethylene terephthalate; a second layer 120 knit from glass fiber and put over the outside of the first layer 110; and a third layer 130 formed by winding reinforcing fibers impregnated with resin, around the second layer 120 and solidifying it. Since the first layer 110 formed of polyethylene terephthalate has a melting point higher than polyethylene, high performance can be expected in a frame exposure test. Further, since both of the second layer 120 and the third layer 130 contain glass fiber and integrally become an FRP (fiberglass reinforced plastic) layer, high pressure resisting performance can be expected. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a container.

For example, Patent Document 1 discloses a tubular braid or a sheet-like woven fabric in which fibers of the same or similar type as reinforcing fibers are knitted and impregnated with a resin, or a sheet-shaped prepreg impregnated with a resin in advance. A flat composite container for high-pressure gas is disclosed in which an anti-slip layer is formed by adhering to a part or all of the surface of the liner including at least the shoulders on the head side and the bottom side.
Patent Document 2 discloses a pressure vessel including a reinforcing material made of a woven fabric in which reinforcing fibers are woven between a dome portion and a fiber reinforced resin layer.

JP 2002-340291 A JP 2004-263827 A

  A container that is lightweight and has excellent gas shielding properties and pressure resistance of contents.

  The container according to the present invention includes a first layer made of a resin and formed into a hollow container shape, and a second layer provided on the outer side of the first layer and made of a three-dimensional knitted fabric.

  Preferably, it further has a third layer which is provided outside the second layer and is formed by winding reinforcing fibers impregnated with resin.

  Preferably, the first layer is mainly composed of a high performance heat resistant resin such as polyethylene terephthalate, polybutylene terephthalate or polyethylene naphthalate. The second layer is composed of a glass fiber bag-like knitted fabric, and the third layer is composed of a fiber reinforced plastic. For example, the third layer is formed by a method of winding fibers such as a filament winding method or a brader method. The fibers constituting the second layer and the third layer may be high-strength and high-rigidity fibers, and carbon fibers or aramid fibers may be used instead of glass fibers.

Preferably, the first layer is composed of one layer of a transparent or translucent polyester resin, the third layer is a state in which glass fibers used for the second layer are impregnated with a resin, The optical refractive index of each layer is selected so as to be translucent in an overlapping state.
Preferably, the bag-like knitted fabric is composed of a plurality of different knitted structures in each part in consideration of stretchability at the dome part and body part at the time of wearing and strength after resin impregnation.

  Further, the container manufacturing method according to the present invention includes a step of forming a resin to form a hollow container, a knitted fabric that fits the hollow container without any gaps in the created hollow container, and the knitted fabric without gaps. And a step of covering.

  Preferably, the method further includes a step of winding the fiber impregnated with the resin around the hollow container covered with the knitted fabric.

  According to the present invention, it is possible to provide a container that is lightweight and excellent in pressure resistance. Furthermore, due to the interaction between the high heat resistance of the first layer resin and the knitted fabric of the second layer, when the container is exposed to a flame, it is compared with a container composed of only the first layer and the third layer. Thus, it is possible to delay the start of leakage of the internal liquid and lengthen the time from flame exposure to rapid flame growth due to leakage of the internal combustible liquid.

2 is a diagram illustrating an appearance of a container 1. FIG. FIG. 3 is a diagram schematically illustrating a cross section of a container body 10. It is a schematic diagram explaining the bag-like knitted material which comprises the 2nd layer 120. FIG.

FIG. 1 is a diagram illustrating the appearance of the container 1.
As illustrated in FIG. 1, the container 1 includes a hollow container body 10, a base portion 20, and a pedestal portion 30. The container body 10 has a hollow structure, as will be described later with reference to FIG. Moreover, the outer surface and inner surface of the container main body 10 are comprised by the curved surface or the plane.
The base part 20 is an entrance / exit of an item to be accommodated in the container body 10 and is made of, for example, metal. The pedestal portion 30 is used to cover a first layer 110 (resin container), which will be described later, with fibers and to attach the first layer 110 (resin container) to a molding machine.
The container 1 contains a high-pressure gas such as LPG, for example.

FIG. 2 is a diagram schematically illustrating a cross section of the container body 10.
As illustrated in FIG. 2, the container body 10 includes an innermost first layer 110, a second layer 120 outside the first layer 110, and a third layer outside the second layer 120. 130.
The first layer 110 is made of a synthetic resin such as plastic. Preferably, the first layer 110 is made of a polyester resin having a high melting point, such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), or a copolymer thereof. Of these polyester resins, it is desirable to use a resin having a high gas barrier property as the first layer 110. Furthermore, the first layer 110 is preferably composed of one layer of a transparent or translucent polyester resin. By adopting a resin having translucency and having a single layer, the contents of the container body 10 can be visually recognized from the outside.

  The second layer 120 is composed of a three-dimensional knitted fabric. For example, the second layer 120 is composed of a bag-like knitted fabric or a tubular knitted fabric knitted with glass fibers. The second layer 120 of this example is composed of a bag-like knitted fabric or a tubular knitted fabric knitted in accordance with the size and shape of the first layer 110, and a resin applied thereto. The second layer 120 in this example is in close contact with the dome portion and the cylindrical portion of the first layer 110 after expansion and contraction, but is not limited to this. It may be in close contact, or may be in close contact with only the cylindrical portion of the first layer 110.

The third layer 130 is solidified by winding reinforcing fibers impregnated with resin. The third layer 130 is integrated with the second layer 120 to form an FRP (Fiber Reinforced Plastics) layer. More preferably, the third layer 130 is made of glass fiber and resin, and the second layer 120 and the second layer 130 have a glass fiber volume content of 35% or more.
The third layer 130 is a layer formed by the filament winding method or the brader method, and the fiber height and the fiber amount are designed to sufficiently withstand the internal pressure. Resins are selected to obtain high light transmission.

  As illustrated in FIG. 2, the first layer 110, the second layer 120, and the third layer 130 are in close contact with each other when they are sequentially overlapped. Since these layers are semi-transparent in a state where they are overlapped with each other, the remaining amount of the contents (such as LPG) can be visually recognized from the outside. Furthermore, the first layer and the second layer have sufficient elongation, and excessive stress generation due to internal pressure is protected by the third layer.

FIG. 3 is a schematic diagram for explaining the bag-like knitted material constituting the second layer 120.
As illustrated in FIG. 3, the bag-like knitted material constituting the second layer 120 includes an inlet contraction part 122, a central cylinder part 124, and a bottom surface contraction part 126. The inlet contraction part 122, the central cylinder part 124, and the bottom surface contraction part 126 of this example are knitted integrally. The inlet accommodating portion 122 corresponds to a region from the insertion opening for inserting the first layer 110 into the bag-shaped knitted fabric of the second layer 120 to the maximum diameter of the first layer 110. That is, the inlet accommodating portion 122 corresponds to a region where the diameter of the first layer 110 increases from the attachment position of the base 20 of the first layer 110, and fits along the shape of this region. The central cylinder portion 124 corresponds to a region where the diameters of the first layers 110 are substantially the same. The bottom surface contraction portion 126 corresponds to a region in contact with the bottom surface of the first layer 110. That is, the bottom surface contraction portion 126 corresponds to a region where the diameter of the first layer 110 becomes smaller, and fits along the shape of this region.
The inlet contraction part 122 and the bottom surface contraction part 126 are configured by a knitted structure different from that of the central cylinder part 124. More specifically, since the shape and the required physical properties are different between the inlet contraction portion 122, the bottom surface contraction portion 126, and the central portion 124, knitting conditions having high fitting properties that meet the respective requirements are employed.
Further, the central tube portion 124 is knitted with a higher yarn density than the inlet contraction portion 122 and the bottom contraction portion 126. Thereby, the pressure resistance of the area | region equivalent to the center cylinder part 124 can be made higher than another area | region.
For example, the bag-like knitted fabric constituting the second layer 120 may be composed of glass fibers and other fibers (chemical fibers), but from the viewpoint of improving the glass content, it is composed only of glass fibers. Is preferred.

Next, a method for manufacturing the container body 10 will be described.
(First step)
First, a resin of PET, PBT, or PEN is molded into a hollow shape to create a hollow container. For example, a hollow container of polyester resin is prepared by blow molding or the like. By forming this hollow container with a single layer, the productivity is improved and the light transmittance is enhanced.
(Second step)
Next, a glass fiber bag-like knitted fabric (FIG. 3) is placed on the outside of the created hollow container (first layer 110). The glass fiber bag-like knitted fabric is knitted in advance in a shape (for example, bell shape) that matches the outer shape of the hollow container (that is, the first layer 110). Since this bag-like knitted fabric has higher stretchability than the woven fabric, it can be covered with the created hollow container.
(Third step)
Next, a reinforcing fiber impregnated with resin is wound around a hollow container covered with a bag-like knitted fabric of glass fiber.
(4th process)
Finally, a resin curing process and deburring are performed to complete the container body 10.

[Characteristics of the container body 10]
Next, the characteristics of the container body 10 will be described.
Since the container body 10 of the present example has the second layer 120 formed of a knitted fabric, high resistance can be expected in the flame exposure test. That is, even if the fibers of the second layer 120 are thermally deteriorated and partially broken, the fibers of the second layer 120 are organized in a mesh shape, so that the fiber tension is maintained at a certain level and can withstand internal pressure. be able to. Furthermore, the second layer 120 can protect the first layer 110 as a substantially surface.
Moreover, since the container main body 10 of this example employ | adopts as a liner (1st layer 110) the polyester resin whose melting | fusing point is higher than resin with good blow moldability, such as polyethylene, higher heat resistance can be anticipated.
Since the container body 10 further includes the third layer 130 formed by the filament winding method, it can withstand higher internal pressure.

Moreover, since the container main body 10 of this example is comprised by the 1st layer 110 comprised by the polyester resin of 1 layer, and the 2nd layer 120 and 3rd layer 130 comprised by glass fiber etc., it is translucent Thus, the remaining amount of the contents can be visually confirmed.
Moreover, since the container main body 10 of this example is comprised with resin and glass fiber, it becomes lighter than a container comprised with a metal, and it is hard to rust.

[Modification]
In the above embodiment, the form in which the second layer 120 is formed of a bag-like knitted fabric has been described. However, the present invention is not limited to this. May be made of glass fiber woven fabric, and the area where the diameter changes may be made of a knitted fabric, such as the inlet shrinkage portion 122 and the bottom shrinkage portion 126.

DESCRIPTION OF SYMBOLS 1 Container 10 Container main body 110 1st layer 120 2nd layer 130 3rd layer 20 Base part

Claims (7)

A first layer made of resin and formed into a hollow container shape;
A container provided on the outer side of the first layer and configured by a bag-shaped knitted fabric. The container according to claim 1, further comprising a third layer formed by wrapping a reinforcing fiber impregnated with a resin, which is provided outside the second layer. The first layer is composed mainly of polyethylene terephthalate, polybutylene terephthalate or polyethylene naphthalate,
The second layer is composed of a bag-like knitted fabric of glass fiber, carbon fiber, and polymer fiber bag-shaped knitted fabric,
The container according to claim 2, wherein the third layer is formed by a filament winding method or a braider method. The first layer is transparent or translucent, and is composed of a single layer of polyester resin having gas shielding properties of the inner solution,
The container according to claim 3, wherein the third layer is translucent in a state where the layers reinforced by the glass fibers used for the second layer overlap each other, and the amount of the contents can be visually confirmed. The container according to claim 3, wherein the bag-shaped knitted fabric is composed of a plurality of different knitted structures and different fibers for each region. Forming a hollow container by molding a resin;
And a step of covering the created hollow container with a stretchable knitted fabric. The manufacturing method according to claim 6, further comprising a step of winding a fiber impregnated with a resin around a hollow container covered with a knitted fabric.

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