JP3038433U - Injection molding container - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To simplify a complicated fitting work of a plastic container formed by welding an upper half portion and a lower half portion. Further, it is an object of the present invention to weld the both to prevent the contents from leaking from the completed container. SOLUTION: An upper half part 2 and a lower half part 3 of a plastic container 1 are separately injection-molded, and an engaging body 7 which projects downward along the lower surface opening edge of the upper half part 2 to the outer periphery thereof. Is integrally formed with the upper half portion 2, while the lower half portion 3 is formed.
An insert 10 protruding downward is formed integrally with the lower half 3 along the opening edge of the upper surface of the upper half, and the insert 10 is inserted into the inside of the engaging body 7, and their contact portions are heat-welded. Then
A plastic container 1 is formed. In the container 1 thus formed, the liquid as the content does not leak out. The engagement body 7 may be formed longer than the insertion body 10.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an improvement of a plastic container for storing or carrying a liquid such as kerosene.

[0002]

[Prior art]

 It is difficult to integrally mold a plastic container for storing or transporting liquid such as kerosene. Therefore, as described in JP-A-5-278139 (Japanese Patent Publication No. 8-18380), a container is divided into an upper half portion and a lower half portion, and the upper half portion and the lower half portion are respectively injection molded. After molding, there is an improvement in which a convex portion provided on the upper surface of the lower half portion is fitted and welded to a concave portion provided on the lower surface of the upper half portion.

[0003]

[Problems to be solved by the device]

 However, in the container described in Japanese Patent Application Laid-Open No. 5-278139 (Japanese Patent Publication No. 8-18380), a concave portion provided on the lower surface of the upper half portion and a convex portion provided on the upper surface of the lower half portion are formed over the entire circumference. The work of simply fitting is complicated. In addition, even if the dimensional accuracy is improved by injection molding, a slight error occurs, and due to this error, there is a place where the convex part provided on the upper surface of the lower half does not fit into the concave part provided on the lower surface of the upper half. There is a drawback that it cannot be used because there is a place where it is generated or it is easily displaced even if it is fitted, and there is a place where the liquid content is leaked out even if it is welded.

The present invention eliminates the complexity of such fitting work, and moreover, even if there is an error in the size of the upper half part and the lower half part, the liquid, which is the content, is removed from the container completed by welding both. The purpose is to prevent leakage.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention separately injection-molds the upper half part and the lower half part of a plastic container, and downwardly perimeters along the lower surface opening edge of the upper half part. While the protruding engaging body is formed integrally with the upper half portion, an insert body that protrudes downward is formed integrally with the lower half portion along the opening edge of the upper surface of the lower half portion. The insert is inserted into the inside, and the contact portions of each other are heat-welded.

Alternatively, the upper half part and the lower half part of the plastic container are separately injection-molded, and an insert body projecting upward along the lower surface opening edge of the upper half part is inserted into the upper half part. While being integrally formed with the lower part, an engaging body that projects upward along the upper surface opening edge of the lower half part is integrally formed with the lower half part, and the insert body is inserted inside the engaging part. Then, the mutual contact portions are heat-welded.

[0007]

[Embodiment of the invention]

 A first embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are enlarged cross-sectional views of the essential part of the present invention. FIG. 1 is a diagram of a state before welding two members, and FIG. 2 is a diagram of a state in which two members are welded. Reference numeral 1 denotes a plastic container in which an injection-molded upper half 2 and lower half 3 are welded and integrated (see FIG. 3).

The upper half portion 2 is provided with the spouts 4 and 4 with lids facing each other at the end of the upper surface, and the grip 5 is provided in the portion sandwiched by the spouts 4 and 4. Further, an upper half-side flat portion 6 having a width of 4 cm is formed on the lower surface of the upper half portion 2 over the entire circumference. Reference numeral 7 denotes an engaging body, which is a plate-like member which projects downward along the lower surface opening edge of the upper half portion 2 and is formed integrally with the upper half portion 2.

The lower half portion 3 is a box-shaped container having an open upper surface, and a lower half portion side flat portion 9 having a width of 4 cm is formed on the entire upper surface. Reference numeral 10 denotes an insert body, which is a plate-like member that projects downward along the upper surface opening edge of the lower half portion 3 and is formed integrally with the lower half portion 3. The engagement body 7 and the insertion body 10 face the upper half portion 2 and the lower half portion 3 with the inverted U-shaped groove portion 8 and the inverted V-shaped groove portion 11 sandwiched therebetween, and both have elasticity and are shown in FIGS. It is freely deformable in the left-right direction shown. The width of the inverted V-shaped groove portion 11 and the insert body 10 is set to be slightly larger than the width of the inverted U-shaped groove portion 8.

Then, the upper half portion 2 and the lower half portion 3 are welded as described below to form a plastic container 1. First, the upper half 2 and the lower half 3 are separately molded by injection molding. The materials of the upper half portion 2 and the lower half portion 3 may be different, but it is preferable that they are made of the same material so as to facilitate welding. When the upper half 2 is pushed downward so that the upper flat 6 and the main flat 9 are in contact with each other, the upper half 2 is pushed over and the lower half 3 is inserted into the engaging body 7. The body 10 is inserted, and the inner surface of the engagement body 7 and the outer surface of the insert body 10 are in contact with each other (see FIG. 2).

The upper half 2 and the lower half 3 have a dimensional error even if they are injection-molded. However, even if there is a dimensional error, the upper half side flat part 6 and the main body side flat part 9 are in any part. Be sure to contact with. Further, the insert body 10 is accommodated in such a manner that it is pushed into the inside of the engaging body 7, and the inside surface of the engaging body 7 and the outside surface of the inserting body 10 are always in contact with each other. In this state, if the container is welded using a welding method that is most suitable for the material, such as hot plate welding, vibration welding, ultrasonic welding, electromagnetic welding, hot air welding, solvent welding, etc. Is completed. It should be noted that the insert 10 may be shaped so as to project outward as it goes downward so that it can be easily inserted inside the engaging body 7.

Next, a second embodiment of the present invention will be described. Similar to the first embodiment, the plastic container 1 has an upper half portion 2 and a lower half portion 3 which are welded and integrated, and the difference from the first embodiment is that the engaging body 7 and The insert 10 is upward, and the insert 10 is integrally formed on the upper half 2 and the engaging body 7 is integrally formed on the lower half 3 (see FIG. 4). That is, the insert body 10 protruding upward is formed integrally with the upper half 2 along the lower surface opening edge of the upper half 2. An engaging body 7 protruding upward is formed integrally with the lower half 3 along the upper surface opening edge of the lower half 3. However, when formed in this way, dust is likely to collect in the inverted V-shaped groove portion 11, and therefore the first embodiment is superior.

Next, a third embodiment of the present invention will be described. Similar to the first and second embodiments, the plastic container 1 is obtained by welding the upper half part 2 and the lower half part 3 into one body, and the difference from the first and second embodiments is that This is the point where the engagement body 7 and the insertion body 10 are projected to the inner circumference of the container (see FIG. 5). That is, the engaging body 7 that projects downward along the lower surface opening edge of the upper half portion 2 is formed integrally with the upper half portion 2. An insert 10 is formed integrally with the lower half part 3 so as to project downward along the upper surface opening edge of the lower half part 3 on the inner periphery thereof. Alternatively, the insert body 10 that projects upward along the lower surface opening edge of the upper half portion 2 is formed integrally with the upper half portion 2. An engaging body 7 that protrudes upward is formed integrally with the lower half portion 3 along the upper surface opening edge of the lower half portion 3 on the inner periphery thereof. If formed in this way, there is an advantage that there is no protruding portion on the side surface of the container 1, but the welded portion of the upper half 2 and the lower half 3 can be seen from the outside, which is not desirable in appearance. There is.

In the first and second embodiments described above, when the engagement body 7 is formed longer than the insertion body 10, the engagement body 7 covers the welded portion and the welded portion cannot be seen from the outside, and thus the appearance is improved. It will be excellent.

[0015]

[Effect of the invention]

 As described above, the present invention integrally forms the downwardly projecting engaging body with the upper half along the lower surface opening edge of the upper half, while the outer circumference is formed along the upper surface opening edge of the lower half. Since the insert protruding downward is integrally formed with the lower half, and the insert is inserted inside the engaging body and the mutual contact parts are heat welded, the upper half and the lower half are aligned. Is simple and the fitting work is simple. In addition, the container has an effect that the contents do not leak out.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of an essential part of a first embodiment of the present invention, showing a state before welding an upper half part and a lower half part.

FIG. 2 is an enlarged cross-sectional view of a main part of the first embodiment of the present invention, showing a state in which an upper half part and a lower half part are welded.

FIG. 3 is a front view of a liquid container.

FIG. 4 is an enlarged cross-sectional view of a main part of a second embodiment of the present invention.

FIG. 5 is an enlarged sectional view of an essential part of the third embodiment of the present invention.

[Explanation of symbols]

 1 Plastic Container 2 Upper Half 3 Lower Half 7 Engagement Body 8 Reverse U-Shaped Groove 10 Insert Body 11 Reverse V-Shaped Groove

Claims (4)

[Utility model registration claims] 1. An upper half part and an upper half part of a plastic container are injection-molded separately, and an engaging body projecting downward along the lower surface opening edge of the upper half part to the outer periphery thereof. On the other hand, while integrally formed with the lower half part, the insert body that projects downward along the upper surface opening edge of the lower half part is formed integrally with the lower half part, and the insert body is inserted inside the engagement body, An injection-molded container made by heat-welding each other's contact parts. 2. The upper half and the lower half of the plastic container are separately molded by injection molding, and the upper half has an insert body that projects upward along the lower surface opening edge of the upper half on the outer periphery thereof. On the other hand, while integrally formed with the lower half part, the engaging body protruding upward along the upper surface opening edge of the lower half part is integrally formed with the lower half part, and the insert body is inserted inside the engaging body, An injection-molded container made by heat-welding each other's contact parts. 3. The injection-molded container according to claim 1, wherein the engagement body is formed longer than the insert body, and the lower surface of the upper half and the upper surface of the lower half are flat. 4. The injection-molded container according to claim 1, wherein the engagement body and the insert body are projected on the inner circumference of the container.