JPH0976356A - Reinforced plastic container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the strength of the mouth cock part of a mirror part or body part by forming a support part for supporting a reinforcing member for forming and reinforcing the mouth cock part to the peripheral edge of the opening formed to the necessary place of the mirror part or body part formed to each of both ends in an axial line direction. SOLUTION: Mouth cock parts 4, 5 for charging and discharging content are provided to the appropriate place of the body part of a base container and the mirror part 3 of the container and a resin impregnated reinforcing fibers are wound around the base container to form a reinforcing layer consisting of a spiral wound layer 6 and a cylindrical wound layer 7. The spiral wound layer 6 is formed by setting the mouth cock parts 5 of the mirror parts 3 of both ends as winding return parts to wind reinforcing fibers around the mirror parts 3 and the body part in an 8-shape so as to reciprocate the mouth cock parts of both ends while shifting a phase in a peripheral direction so as to avoid the mouth cock parts 4, 5. Each of the mouth cock parts 5 consists of the support part 3A rising from the mirror part 3 of the base container in a cylindrical shape and the reinforcing member 8 attached to the inner diameter surface of the support part 3A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technical field of a reinforced plastic container for containing contents such as gas and liquid, and in particular, a reinforced plastic container having a reinforced plug portion for filling and discharging contents. Regarding

[0002]

BACKGROUND OF THE INVENTION Containers are used to store compressed gas or contain liquids. For example, for large trucks and buses,
It is equipped with an air tank (a type of accumulator) that stores the compressed air used to operate the brakes.

As such an air tank, a generally cylindrical metal container is used.

The metal container is generally made of steel,
A plug portion is provided for filling or discharging the contents, and a mirror portion to which the plug portion is attached by welding is welded to a body portion having another plug portion. Such containers are
Due to the need for weight reduction, aluminum containers have been partially used recently. However, the price of this aluminum container is much higher than that of steel container.

To solve the problems of weight reduction and cost reduction, for example, a plastic container obtained by blow molding is used as a base container, and the outer surface of the base container is impregnated with a resin such as glass fiber or carbon fiber. A reinforced plastic container in which a reinforcing layer is formed by winding is considered.

[0006]

However, in putting the above-mentioned reinforced plastic container into practical use, when the container body has a large number of plug portions (boss portions) such as an air tank, the strength of the plug portions is increased. However, such a reinforced plastic container has not been put into practical use yet.

The present invention solves such a problem, and provides a reinforced plastic container capable of improving the strength of the stopper portion even if the mirror portion or the body portion is provided with the stopper portion. Has an aim.

[0008]

In the present invention, a plastic container serves as a base container. In this base container, openings for filling and discharging the contents are formed in necessary portions of the mirror portion and the body portion formed at both ends in the axial direction. A support portion for supporting a reinforcing member for forming and reinforcing the spout portion is formed on the periphery of the opening.

The base container is obtained by blow molding, rotational molding or injection molding of a thermoplastic resin. The reinforcing member has higher strength than the material of the base container, and is made of metal, high-strength resin,
Made of fiber reinforced thermoplastic resin.

The support portion is formed in a cylindrical shape standing up from the peripheral portion of the opening of the spigot portion, or is formed as a flat or curved receiving surface on the outer surface of the base container at the peripheral portion. It The reinforcing member has at least a tubular portion, and when the supporting portion has the above-mentioned tubular shape, it is attached to the inner peripheral surface or the outer peripheral surface of the supporting portion. When the reinforcing member also has a flange portion extending from the base portion of the tubular portion, the flange portion is attached to the receiving surface formed on the base container as the support portion. At that time, the contact surface between the flange and the receiving surface may be a flat surface or a curved surface in which the outer surface of the base container is left as it is. The receiving surface can also be formed as a recess for receiving the flange. The recess may be blow-molded as it is, or may be spot-machined thereafter.

The reinforcing member and the base container are attached to each other by press-fitting or adhering to the supporting portion of the base container.

After the reinforcing member is attached to the base container, a reinforcing layer of reinforcing fibers is wound around the base container, and when the reinforcing member has a flange portion, the base container is covered so as to cover the flange portion. A reinforcing layer is formed on top.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show an outline of a reinforced plastic container of the present invention. FIG. 1 is a sectional view taken along a plane including an axis of the container, and FIG. 2 is a perspective view showing a part of the container. .

In FIG. 1, a base container 1 has a cylindrical body 2
Are formed by blow molding, with the convexly curved mirror portions 3 being integrated on both end sides. As the material of the base container 1, resins such as high density polyethylene, low density polyethylene, polypropylene, polyamide, saturated polyester and ABS are suitable.

The base container 1 includes a mirror portion 3 and an appropriate portion of the body portion 2.
In addition, it has spouts 4 and 5 for filling and discharging the contents. A reinforced layer formed by winding reinforced fibers impregnated with a resin is formed on the base container 1. As the reinforcing fiber, any one can be used as long as it functions as a reinforcing fiber such as glass, carbon, aramid, and Kevlar fiber. Preferred are low cost glass fiber and carbon fiber. The reinforcing layer is composed of a spiral wound layer 6 and a cylindrical wound layer 7. As can be seen in FIG. 2, the spiral winding layer 6 is formed in a shape of 8 so that the plug portions 5 of the mirror portions 3 at both ends are used as rewinding portions and reciprocate at the plug portions at both ends, while shifting the phase in the circumferential direction. It is formed by winding the reinforcing fiber around the mirror portion 3 and the body portion 2 while avoiding the plug portions 4 and 5. The cylindrical winding layer 7 is the body 2
Is formed on the spiral wound layer 6 by circumferentially winding the reinforcing fiber while avoiding the plug portion 4 while shifting the phase in the axial direction of the container.

In the present invention, the reinforced plastic container as described above is characterized in that the spouts 4 and 5 are reinforced.

FIG. 3 is a sectional view showing the spigot portion 5 of the mirror portion 3 in detail. The spout part 5 is composed of a support part 3A that stands up in a cylindrical shape from the mirror part 3 of the base container 1, and a reinforcing member 8 attached to the inner diameter surface of the support part 3A. A threaded portion 3A1 for capping a cap (not shown) is provided on the outer diameter surface of the support portion 3A. The threaded portion may be formed on the inner diameter surface instead of the outer diameter surface. The same applies to the other examples below.

The reinforcing member 8 is made of a material having higher strength than the base container 1, such as metal, high strength resin or fiber reinforced plastic. As the high-strength resin, phenol resin, urea resin, melamine resin, unsaturated polyester, epoxy resin and the like can be used. The material for this reinforcing member is the same not only in the example of FIG. 3 but also in the examples of FIG. 4 and subsequent figures.

Thus, the tubular reinforcing member 8 made of the above metal or resin is attached to the inner diameter surface of the support portion 3A. This attachment is performed by press fitting, adhesion, etc., but the method is not limited. In the case of this example, the reinforcing member 8 has a brim portion 8A at the upper end portion in order to determine the position with the support portion 3A and enhance the coupling. In addition, in this example, the reinforcing member 8 has a lower end portion that is directed toward the inside of the base container,
A peripheral groove 8B for draining water is formed here, but this is not directly related to the present invention.

After the reinforcing member 8 is attached to the support portion 3A as described above, the reinforcing fiber is wound to form the spiral wound layer 6.

In the example shown in FIG. 4, the supporting portion 3A
A reinforcing member 9 is attached to the outer periphery of the plug to form the plug part 5. The reinforcing member 9 has a tubular portion 9A and a flange portion 9B. A threaded portion 9A1 similar to the threaded portion 3A1 in FIG. 1 is formed on the outer periphery of the tubular portion 9A, and the flange portion 9B is shaped along the mirror portion 3. Thus,
In FIG. 4, the reinforcing member 9 is externally fitted to or bonded to the support portion 3A, and thereafter the spiral wound layer 6 is formed. In that case, the spiral wound layer 6 is as shown in the figure,
Formed on the flange portion 9B, it firmly holds the reinforcing member 9 to the base container 1.

The example of FIG. 5 is different from the example of FIG. 4 in that a cushioning member 10 is interposed between the flange portion 9B and the mirror portion 3. In the case of FIG. 4, when the spiral winding layer 6 is formed on the flange portion 9B, the flange portion 9B that receives a force due to the winding of the spiral winding layer 6 may cause stress concentration on the mirror portion 3 at the outer peripheral edge. However, the stress concentration can be avoided by interposing the cushioning member 10 in FIG. Therefore, it is sufficient to dispose the cushioning member 10 at the outer peripheral edge portion of the flange portion 9B as shown in FIG.

As shown in FIG. 6, it is naturally possible to use the reinforcing member 8 of FIG. 3 and the reinforcing member 9 of FIG. 4 in combination. At this time, the cushioning member 10 of FIG. 5 may be used together with the reinforcing member 9.

Although the examples of FIGS. 3 to 6 are for reinforcing the plug portion 5 in the mirror portion 3, all of them can be applied to the plug portion 4 of the body portion 2 as they are. In that case,
Although the reinforcing layer is only the spiral wound layer 6 in FIGS. 3 to 6, in the body portion 2, the cylindrical wound layer 7 shown in FIGS. 1 and 2 is also wound and formed on the spiral wound layer 6.

Although the examples of FIGS. 7 to 16 show the case of the mouth plug portion 4 of the body portion 2 below, it goes without saying that these can also be applied to the mouth stopper portion of the mirror portion.

In FIG. 7, a reinforcing member 11 similar to the reinforcing member 8 of FIG. 3 is provided on the inner diameter surface of the support portion 3A, and the reinforcing member 12 is similar to the reinforcing member 9 with the buffer member 10 shown in FIG.
With a cushioning member 13 interposed between the body 2 and the support 3A.
It is arranged so as to face the. Then, the spiral wound layer 6 and the cylindrical wound layer 7 are wound and formed. The reinforcing member 12 in FIG. 7 has a portion 12A that protrudes radially inward at the upper end, and engages with a step corresponding to the support 3A to increase the degree of coupling with each other.

The example of FIG. 8 is almost the same as that of FIG. 7, but the reinforcing member 11 attached to the inner diameter surface of the support portion 3A.
However, it has a flange portion 11A at the lower end similar to the upper end, so that the mounting in both the up and down directions is ensured. In this case, the reinforcing member 11 is attached to the supporting portion 3A by integral molding.

In the examples shown in FIGS. 7 to 8, when there is a partial gap between the reinforcing member 12 and the outer peripheral surface of the supporting portion 3A due to molding or processing accuracy, the cap is removed during use. Even if fitted, there is a possibility that the contents will wrap around the inner surface of the cap and leak from the gap. Further, even if the above-mentioned gap is initially adhered without any gap, such gap may occur due to repeated use for a long period of time. Therefore, in FIG. 9 and FIG. 10, such leakage is eliminated as much as possible. In FIG. 9, a notch is formed on the inner diameter edge of the upper end of the reinforcing member 12, and the adhesive 14 is filled in the notch so that the adhesion is strong and the sealing with the support portion 3A is more complete. or,
In FIG. 10, an annular groove is formed in the lower portion of the inner diameter surface of the reinforcing member, and an O-ring 15 is arranged therein to ensure sealing with the supporting portion 3A.

Next, in FIG. 11, one reinforcing member 16 is attached so as to contact the inner diameter surface and the outer diameter surface of the support portion 3A. In the example of FIG. 11, the tip end of the cylindrical support portion 3A has a taper portion 3B, and the reinforcing member 16 is formed with an annular groove 16A having a taper portion 16B corresponding thereto. Further, the reinforcing member 16 is provided with a flange portion 16C, and is arranged on the body portion 2 via a cushioning member 17. The reinforcing member 16 is attached such that the supporting portion 3A is press-fitted into the annular groove 16A or is inserted after applying an adhesive. Then, the spiral wound layer 6 and the cylindrical wound layer 7 are formed.

The example of FIG. 12 is almost the same as that of FIG. 11, except that an O-ring 18 for sealing is arranged between the supporting portion 3A and the annular groove 16A of the reinforcing member 16. There is. By doing so, there is no risk of the contents leaking through the contact surface between the support portion 3A and the annular groove 16A.

In the examples of FIGS. 7 to 12, the reinforcing member has a flange portion, and the flange portion is on the body portion to form a step on the body portion. ~ Fig. 16
In (1), this point is improved and the reinforcing layer is easily formed by winding. In FIG. 13, the reinforcing member 19 is the tubular portion 19
Although it has an A and a flange portion 19B, a concave portion 2A for accommodating the flange portion 19B is formed in the body portion 2, and this serves as a support portion. A small annular protrusion 20 is formed on the bottom surface of the flange portion 19B. When the spiral winding layer 6 and the cylindrical winding layer 7 are wound, the protrusion 20 bites into the concave portion 2A and the flange portion 19B.
Seal between B and the body 2. In the example of FIG. 13, since the outer surface of the flange portion 19B is flush with the outer surface of the body portion 2 as shown in the drawing, it is easy to form a wound reinforcing layer composed of the spiral wound layer 6 and the cylindrical wound layer 7. Becomes

In FIG. 14, the flange portion 19 of FIG.
Instead of the annular protrusion provided on B, the flange portion 19B
An O-ring 21 is provided between the recess and the recess 2A to ensure a seal.

In FIGS. 15 and 16, in addition to those of FIGS. 13 and 14, respectively, in order to strengthen the seal, a notch is formed in the reinforcing member as shown in FIG. Is filled.

In the present invention, in order to ensure the adhesion between the reinforcing member and the supporting portion, it is preferable to use an adhesive resin on the adhesive surface of the reinforcing member.

When the reinforcing member is made of metal, the reinforcing member is made by casting, shaving and casting. In this case, when it is used over a long period of time, it repeatedly undergoes thermal expansion due to temperature fluctuations, but because the reinforcing member body is metal and the adhesive surface is resin, peeling occurs at the adhesive surface due to the difference in thermal expansion coefficient. May occur. Therefore, as a countermeasure, a layer of the above adhesive resin is formed on the adhesive surface via a primer layer,
Here, the difference in thermal expansion can be absorbed. In that case, an epoxy resin type, a cyanoacrylate type, a silicone type, or a polyamide type is used as the primer, and the layer thickness of the primer is 5 to 300 μm, preferably 10 to
50 μm, and the adhesion of the metal reinforcing member is about 100 to
After preheating to 300 ° C., a primer is applied to form a primer layer. As the adhesive resin, maleic acid-modified polyethylene, maleic anhydride-modified polyethylene, acrylic acid-modified polyethylene, or methacrylic acid-modified polyethylene can be used, and maleic anhydride-modified polyethylene is particularly preferably used. It is also preferable that a functionally graded material is interposed between the reinforcing member body and the resin on the adhesive surface in the middle of the layer of the primer to further gradually reduce the difference in thermal expansion coefficient between the metal and the resin. It becomes a means.

Since the reinforcing fiber forming the reinforcing layer is at a high temperature when the primer and the adhesive resin are impregnated with the resin or when the resin is cured, the primer and the adhesive resin receive the heat when the fiber is wound and the above-mentioned adhesion is achieved. The conductive resin is welded and adhered to the base container.

Next, when the reinforcing member is made of resin, it can be made by double-layer injection molding. That is, the main body of the reinforcing member and the adhesive layer in contact with the supporting surface of the main body are integrally formed. In that case, as the main body, nylon 6, nylon 66, nylon 12, glass fiber-containing nylon 6, glass fiber-containing nylon 66, glass fiber-containing nylon 12, polypropylene, polycarbonate, polyacetal, glass fiber-containing polypropylene, glass fiber-containing polycarbonate, Glass fiber-containing polyacetal, polyphenylene oxide, polyethylene terephthalate, glass fiber-containing polyphenylene oxide,
Glass fiber-containing polyethylene terephthalate, polyetheretherketone, polyetherketone, glass fiber-containing polyetheretherketone, glass fiber-containing polyetherketone, or the like, or those obtained by replacing the glass fiber with carbon fiber can also be used.

As the adhesive layer, polyethylene or modified polyethylene can be used.

[0040]

As described above, according to the present invention, a reinforcing member made of a material having a higher strength than that of the base container is provided in the plug portion of the container formed by winding the reinforcing fiber on the plastic base container. Therefore, even if the internal pressure of the container is received, the strength of the spout portion does not decrease as compared with the other parts, and the strength of the entire container can be improved and the life of the container can be extended. In particular, when the reinforcing member has a flange portion, the flange portion is wound and held by the reinforcing fibers, so that the strength is further increased.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a schematic overall configuration of a container of the present invention.

FIG. 2 is a perspective view showing a part of the appearance of the container of FIG.

FIG. 3 is a cross-sectional view showing an example of a spigot portion in the mirror portion of the container of FIG.

FIG. 4 is a cross-sectional view showing another example of the spigot portion in the mirror portion of the container of FIG.

5 is a cross-sectional view showing still another example of the spout part in the mirror part of the container of FIG. 2. FIG.

FIG. 6 is a cross-sectional view showing still another example of the spigot portion in the mirror portion of the container of FIG.

FIG. 7 is a cross-sectional view showing an example of a spigot portion in the body of the container of FIG.

8 is a cross-sectional view showing another example of a spigot portion in the body of the container of FIG.

9 is a cross-sectional view showing still another example of the spigot portion in the body of the container shown in FIG.

FIG. 10 is a cross-sectional view showing still another example of the spout part in the body of the container shown in FIG.

FIG. 11 is a cross-sectional view showing still another example of the spigot portion in the body of the container shown in FIG.

FIG. 12 is a cross-sectional view showing still another example of the spout part in the body part of the container of FIG.

FIG. 13 is a cross-sectional view showing still another example of the spout part in the body part of the container of FIG.

FIG. 14 is a cross-sectional view showing still another example of the spout part in the body part of the container of FIG.

FIG. 15 is a cross-sectional view showing still another example of the spigot portion in the body of the container shown in FIG.

16 is a cross-sectional view showing still another example of the spout part in the body part of the container in FIG. 2. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base container 2 Body part 3 Mirror part 3A Support part 4,5 Spout part 6 Spiral winding layer 7 Cylindrical winding layer 8,9 Reinforcing member 9B Flange part 10 Buffer member 11,12 Reinforcing member 11A Flange part 13 Buffering member 14 Adhesion Agent 15 O-ring 16 Reinforcing member 17 Cushioning member 18 Sealing member (O-ring) 19 Reinforcing member 19B Flange portion 20 Protrusion 21 Sealing member (O-ring) 22 Adhesive

Claims (9)

[Claims] 1. A substantially cylindrical plastic base container has an outer surface having a reinforcing layer made of a fiber reinforced resin, and the base container has a cylindrical shape protruding from a peripheral edge formed in a mirror portion or a body portion. A reinforced plastic container having a plug portion, the reinforcing layer consisting of a spiral wound layer and a cylindrical wound layer, the stopper portion being made of a material having a higher strength than the base container, and at least the inner diameter surface of the stopper portion or Having a reinforcing member having a cylindrical portion forming an outer diameter surface,
The base container has an outer surface on which a supporting portion for supporting the reinforcing member is formed at a peripheral portion of the opening, and the reinforcing layer is wound after the reinforcing member is supported by the supporting portion. Plastic container. 2. The spiral wound layer is wound in such a manner that the plug portions at both ends of the base container are folded back and the phases are shifted in the circumferential direction in an 8-shape and avoiding the plug portion, and the cylindrical wound layer is spiral. 2. The reinforced plastic container according to claim 1, further comprising a fiber reinforced layer, which is wound on the winding layer with a phase shifted in the axial direction of the base container and avoiding a spout part. 3. The support portion is formed integrally with the base container in a tubular shape so as to stand up from the peripheral portion of the opening and form a part of the plug portion, and the reinforcing member is formed on the inner diameter surface of the support portion. The reinforced plastic container according to claim 1 or 2, which is attached. 4. The reinforcing member has a flange portion extending radially outward from a base portion of the tubular portion, and the support portion serves as a receiving surface for receiving the flange portion on the mirror portion and / or the outer surface of the body portion of the base container. The reinforced plastic container according to any one of claims 1 to 3, which is formed. 5. The reinforced plastic container according to claim 1, wherein a seal member is interposed between the reinforcing member and the support portion. 6. The reinforced plastic container according to claim 4, wherein a cushioning member is interposed at least at a part between the flange portion and the receiving surface. 7. The reinforcing member and / or the supporting portion has a cutout portion at an edge portion of a surface where they contact each other, and the cutout portion is filled with an adhesive agent. Reinforced plastic container described in one. 8. The reinforced plastic container according to claim 1, wherein the reinforcing member is made of metal, high-strength resin, or fiber reinforced plastic. 9. The reinforcing member according to claim 1, wherein the reinforcing member is made of metal, and an adhesive resin layer is formed on a surface contacting the supporting portion via a primer. Plastic container.