JPH0957836A - Synthetic resin container and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin container and its manufacturing method, by which flange parts fitting through tongued and grooved faces can highly accurately be molded at the mating surfaces of a container and in which the bending characteristics of a hinge connecting a main body with a lid body is favorable. SOLUTION: A synthetic resin container consists of a main body 1, a lid 2 and a hinge 3 connecting them with each other, all of which are molded into an integral body. Both the main body 1 and the lid 2 have a single walled structure respectively. The main body 1 and the lid 2 are equipped flange parts 4 and 5, which are compressed so as to be fitted through tongued and grooved faces to each other. The hinge 3 is bendably formed thinner between the flange part 4 of the main body 1 and the flange part 5 of the lid 2 than the respective flange parts 4 and 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a main body and a lid body, and has a flange portion on the mating surface of the main body and the lid body that engages with each other in a concavo-convex manner, and between the flange portion of the main body and the flange portion of the lid body. The present invention relates to a synthetic resin container formed by integrally molding a hinge that continuously connects them to each other, and a manufacturing method thereof.

[0002]

2. Description of the Related Art A synthetic resin container having a main body and a lid and a flange portion on the mating surface of the main body and the lid is disclosed in Japanese Patent Publication No.
Japanese Patent Publication No. 69522, and in a method of blow molding a synthetic resin container in which a main body and a lid are integrally connected by a bendable hinge, a hinge thinned by compression is formed using a hinge bar. The method of doing is described in JP-A-57-
The one described in Japanese Patent No. 1726 is known.

[0003]

[Problems to be Solved by the Invention] Japanese Patent Publication No. 5-69522
As described in the publication, in the case where a flange is formed on the mating surface of the container and the flange is fitted in a concavo-convex shape, a high flange forming accuracy is particularly required. Also, in the case where the mating surface of the container has a flange that fits unevenly, unless the molding accuracy of the hinge that connects the main body and the lid is high, the uneven fitting of the flange when the container is closed causes a malfunction. However, JP-A-57-
As described in Japanese Patent No. 1726, it is difficult to mold the hinge with high accuracy by using the blow molding means using the hinge bar, and it is also difficult to sufficiently thin the hinge to improve the bending characteristics.

Therefore, the present invention is intended to solve the above problems in the conventional synthetic resin container,
It is possible to mold the flange part that fits the mating surface of the container with high molding accuracy, and the bending characteristic of the hinge that connects the main body and the lid is good. A rib made of synthetic resin, which is excellent in storage and holding properties, and which has improved rigidity of the flange portion by increasing the rigidity of the main body and lid, and a synthetic resin container such as this. An object is to provide a manufacturing method for manufacturing.

[0005]

In order to achieve the above object, a container made of synthetic resin according to the present invention comprises a main body, a lid body, and a hinge for connecting them, which are integrally formed. A container made of synthetic resin for accommodating an item to be housed between recesses, in which both the main body and the lid have a single-wall structure, and the mating surfaces of the main body and the lid are formed with flange portions that are fitted to each other by projections and depressions. The recess and the lid recess are formed by arranging a plurality of ribs having a U-shaped cross section that project into the container, and the height of the ribs is formed to a height corresponding to the external shape of the stored object. Thus, the object to be stored is configured to be pressed and supported by the supporting surface at the protruding tip of the rib.

In the method of manufacturing a synthetic resin container according to the present invention, a main body, a lid, and a hinge for connecting them are integrally molded, and a flange portion is formed on the mating surface of the main body and the lid so as to be concavo-convex. In the method for producing a synthetic resin container, the cavity for forming the main body recess and the lid recess of the container under pressure or vacuum, and the cavity for compressing the main body flange of the container, the lid flange, and the hinge. And a cavity for pressure molding or vacuum forming similar to the one die, and the other die having a cavity for compression molding are arranged so as to face each other, and one die that is facing away from the other die. Between the other mold, a core mold is formed in which the compression surface for compression molding the main body flange, the lid flange, and the hinge is formed on both surfaces in one mold direction and the other mold direction. A preform formed by plasticizing a thermoplastic resin material is extruded from an extrusion head, and a pair of dies are clamped to preform between one die and a core die and the other die and a core die, respectively. The body flange, lid flange and hinge are molded by gripping the body and compression-molding the part of the preformed body sandwiched between the compression cavity of the mold and the compression surface of the core mold. Cavity and lid body recess The preform body located between the cavity and the core mold is integrally formed with the main body and the lid body and the hinge that connects the body and the lid body by pressure forming or vacuum forming. It is characterized in that a pair of containers is molded, then the mold is opened to take out the molded product from the mold and the core mold, and the pair of containers is separated.

Further, in the method for manufacturing a synthetic resin container according to the present invention, the main body, the lid and the hinges connecting them are integrally molded, and the mating surfaces of the main body and the lid are fitted to each other by concavo-convex fitting. In a method of manufacturing a synthetic resin container having a flange portion, a cavity for pressure-molding or vacuum-molding a main body recess and a lid recess of the container, and a compression cavity for compression-molding a main body flange of the container, a lid flange, and a hinge. And a mold member having a convex rib forming cavity for forming a rib and having a compression surface for compression-molding the main body flange, the lid flange and the hinge, corresponding to the compression cavity of the mold. The extruded head extrudes a preformed body obtained by plasticizing a thermoplastic resin material, and holds the preformed body between the mold and the mold member,
A main body flange, a lid flange and a hinge are formed by compression-molding a portion of the preform sandwiched between the compression cavity of the die and the compression surface of the die member, and the compression cavity of the die and the rib of the die member. Ribs are formed on the part of the preform that is sandwiched between the forming cavity and the part of the preform that is located between the main body recess cavity of the mold and the lid recess cavity and the mold member. By doing so, a container integrally formed with a main body and a lid and a hinge that connects the main body and the lid is formed,
Then, the mold is opened and the molded product is taken out.

In the method of manufacturing a synthetic resin container, the mold member is a core mold or a mold, and is not limited to molding a pair of containers.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 illustrate a synthetic resin container according to the present invention, and FIGS. 4 and 5 illustrate a method for manufacturing a synthetic resin container according to the present invention. ing.

1 to 3, 1 is a main body, 2 is a lid, and the main body 1 and the lid 2 have a single wall structure. The main body 1 and the lid body 2 are connected by a hinge 3,
The lid 2 can be opened and closed with respect to the main body 1 by a hinge 3.
The mating surfaces of the main body 1 and the lid body 2 are provided with compressed flange portions 4 and 5 in such a manner that they are fitted to each other in a concave-convex manner. A fitting convex portion 7 is formed on the flange portion 5 of the lid body 2, and the fitting concave portion 6 and the fitting convex portion 7 are fitted in concave and convex so that the flange portion 4.5 comes into close contact. . Above hinge 3
Is a flexible member that is further compressed from the flange portions 4 and 5 to have a reduced thickness. 8 is an object to be stored, and the main body 1
A main body recess 9 for pressing and supporting the object to be stored 8 is formed therein, and a lid recess 10 is formed in the lid body 2.
By forming 1 and 12, a supporting surface corresponding to the shape of the object to be stored 8 is formed. Reference numeral 13 is a rib having a U-shaped cross section, and the ribs 13 are formed by arranging a plurality of ribs.
In addition, the protruding height of the rib 13 corresponds to the external shape of the object 8 to be stored, and the supporting surface of the protruding tip of the rib 13 presses and supports the object 8 to be stored. 14 is a lock receiving portion, 1
Reference numeral 5 denotes a locking piece, and the locking piece 15 is connected to the flange portion 5 of the lid body 2 by a hinge 16, and the locking piece 15 is detachable from the locking receiving portion 14.

In FIGS. 4 and 5, 17 is one mold, 18 is the other mold, and 19 is a core mold. One mold 17 is formed by pressure molding the main body recess and the lid recess of the container. It has a cavity 20 for vacuum forming, a flange cavity 21 for forming the main body flange of the container, a flange cavity 22 for forming the lid flange, and a hinge cavity 23 for compression forming the hinge. The other mold 1
8 is symmetrical with the one die 17 and one die 1
Cavity 2 for pressure forming or vacuum forming similar to 7.
0, the flange cavities 21 and 22, and the hinge cavities 23, and the one die 17 and the other die 18 are arranged facing each other. The core die 19 is arranged between the one die 17 and the other die 18. Reference numeral 24 is a lock receiving portion cavity, 25 is a lock piece cavity, and 26 is a hinge cavity.

The core die 19 has compression surfaces 27, 27, 27 for compression-molding the main body flange, the lid flange and the hinge.
On both sides of the one die 17 direction and the other die 18 direction. Further, the core die 19 has a blow-in hole 28 for pressurized fluid for blow molding, and 29 is an inlet for the pressurized fluid.

The core die 19 is provided with convex rib forming cavities 30, 30, 30 for forming ribs on both sides in the direction of one die 17 and the direction of the other die 18. The rib forming cavity 30 has a rib forming groove 32 sandwiched between the pressing surfaces 31 on both sides, and the rib forming groove 32 has a step shape.

To blow mold a synthetic resin container, as shown in FIG. 4, a preform 33, which is a plasticized thermoplastic resin material, is extruded from an extrusion head 34, and a pair of molds 17 and 18 are formed. Tighten and hold the preform 33 between the one die 17 and the core die 19 and between the other die 18 and the core die 19, respectively. Then, the main body flange, the lid flange and the hinge are formed by compression-molding the part of the preformed body 33 sandwiched between the compression cavity of the mold and the compression surface of the core die, and the main body recess cavity of the mold and A pair of integrally formed main body and lid body and a hinge for connecting the main body and the lid body are integrally formed by pressure forming or vacuum forming a portion of the preformed body located between the lid recess cavity and the core mold. Mold the container. Next, the mold is opened to take out the molded product from the pair of molds 17 and 18 and the core mold 19, and the pair of containers are separated to obtain two molded products. FIG. 5 shows an example including a vacuum device 34 for vacuum forming.

In the blow molding step, ribs are formed on the portion of the preform 33 sandwiched between the compression cavities of the pair of molds 17 and 18 and the rib forming cavity 28 of the core die 19. Since the ribs are pressed by the pressing surfaces 31 on both sides of the rib forming cavity 30 and compressed by the rib forming groove 32 between them, a rib with high dimensional accuracy is formed and thinning is prevented. It

[0016]

EFFECTS OF THE INVENTION According to the present invention, it is possible to form a flange portion which is fitted on the mating surface of the container with a high molding accuracy in a concave and convex shape.
Moreover, the bending characteristics of the hinge that connects the main body and the lid body are good, and further, ribs are formed on the main body and the lid body together with the molding of the flange portion, which is excellent in storing and holding properties, and at the same time, the body and the lid body By increasing the rigidity, it is possible to obtain a synthetic resin container in which the concave and convex fitting accuracy of the flange portion is further improved, and such a synthetic resin container can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a plan view showing an opened synthetic resin container according to the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view taken along line BB of FIG. 1;

FIG. 4 is a cross-sectional view showing an embodiment of the synthetic resin container according to the present invention before blow molding.

5 is a cross-sectional view showing a state in which the mold is clamped and blow molding is completed from the state of FIG.

[Explanation of symbols]

1 Main body 2 Lid body 3 Hinge 4,5 Flange portion 6 Fitting concave portion 7 Fitting convex portion 8 Stored object 9 Main body recess 10 Lid body recess 11, 12 Recessed groove 13 Plural ribs 14 Lock receiving portion 15 Locking piece 16 Hinge 17 One Mold 18 Other Mold 19 Core Mold 20 Cavity 21 Flange Cavity 22 Flange Cavity 23 Hinge Cavity 24 Locking Receiving Cavity 25 Locking Cavity 26 Hinge Cavity 27, 27, 27 Compression Surface 28 Pressing Fluid injection hole 29 Pressurized fluid introduction passage 30, 30, 30 Rib-forming convex rib forming cavity 31 Both side pressing surfaces 32 Rib-forming concave groove 33 Pre-forming body 34 Vacuum device

Claims (3)

[Claims] 1. A container made of synthetic resin, wherein a main body, a lid, and a hinge connecting them are integrally molded, and an object to be stored is housed between the main body recess and the lid recess. Both bodies have a single-wall structure, and the mating surfaces of the main body and the lid are formed with flanges that engage with each other, and the main body recess and the lid recess have a plurality of ribs with a U-shaped cross-section protruding inside the container. The ribs are formed in a regular arrangement, and the protruding height of the ribs is formed to correspond to the external shape of the object to be stored, so that the object to be stored is pressed and supported by the supporting surface of the protruding tip of the rib. A synthetic resin container characterized by the above. 2. A synthetic resin container produced by integrally molding a main body, a lid, and a hinge that connects them, and forming flanges on the mating surfaces of the main body and the lid that are fitted to each other. In the method, a cavity for pressure-forming or vacuum-forming the body recess and the lid recess of the container, one mold having a cavity for compressing and molding the container body flange, the lid flange and the hinge, and the one mold. Similarly, a cavity for pressure molding or vacuum molding and another mold having a cavity for compression molding are arranged facing each other, and between the one mold facing the other and the other mold, a main body flange and A preform formed by plasticizing a thermoplastic resin material by arranging a core die having compression surfaces for compression-molding the lid flange and the hinge on both surfaces of one mold direction and the other mold direction. While extruding from the extrusion head, the pair of molds are clamped, and the preforms are respectively held between one mold and the core mold and the other mold and the core mold, and the compression cavity of the mold and By molding the part of the preform sandwiched between the compression surface of the core mold and the main body flange and lid flange and hinge, the main body recess cavity and lid recess cavity of the mold and the core mold By molding the part of the preformed body located between them by pressure forming or vacuum forming, a pair of containers in which the main body and the lid body and the hinge connecting the main body and the lid body are integrally formed are formed, and then the mold is formed. A method for manufacturing a synthetic resin container, which comprises opening and taking out a molded product from a mold and a core mold and separating a pair of containers. 3. A synthetic resin container manufactured by integrally molding a main body, a lid, and a hinge for connecting them, and forming a flange portion on the mating surface of the main body and the lid, the concave portions being fitted into each other. In the method, a cavity for pressure-forming or vacuum-forming a body recess and a lid recess of a container, a mold having a compression cavity for compression-molding a body flange, a lid flange and a hinge of the container, and a compression cavity of the mold. Correspondingly, a mold member having a convex rib forming cavity having a compression surface for compression molding the main body flange, the lid body flange and the hinge and forming a rib is arranged,
A preform formed by plasticizing a thermoplastic resin material was extruded from the extrusion head, and the preform was held between the mold and the mold member and sandwiched between the compression cavity of the mold and the compression surface of the mold member. The main body flange, the lid flange and the hinge are molded by compression molding the part of the preform, and the rib is formed on the part of the preform sandwiched between the compression cavity of the mold and the rib forming cavity of the mold member. At the same time, the main body recess cavity and the lid body cavity and the portion of the preform body located between the recess cavity and the die member are subjected to pressure molding or vacuum molding to connect the body body and the lid body and the body body and the lid body. A method for manufacturing a synthetic resin container, characterized by molding a container integrally formed with a hinge to be installed, and then opening a mold to take out a molded product.