JPH0748519Y2 - Double container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a double container used for filling a fluid such as a viscous material or a liquid.

<Prior Art> Conventionally, a container having a double structure of an inner container and an outer container, filled with a fluid in the inner container, and pressing the outside of the container to push out the contents is, for example, It is known from Kaihei 1-132539. In this known technique, a pinch-off portion on the bottom surface, or a mouth is provided between the inner and outer layers to allow ventilation, and the negative pressure between the inner and outer containers generated when the contents are poured out from this gap is released. Prevents the outer container from shrinking and deforming.

<Problems to be Solved by the Invention> However, in the above-mentioned conventional means, the inner layer (4) and the outer layer (5) which are not adhesive to each other can be ventilated in the pinch-off portion (9) and the mouth portion (3). Since they are only in surface contact with each other in such a state, the integral bonding force between them is weak, so that when used, there is a gap between the inner and outer layers, or when the content is low, the inner layer is separated by the outer layer. Since it may get inside the container, it is inconvenient to use, which is a major factor that deteriorates the quality of the container.

Therefore, according to the present invention, while the inner and outer layers are simultaneously molded with a synthetic resin material having no adhesiveness to each other, the mouth portion of the upper end and the pinch-off portion of the lower end are firmly engaged and coupled to each other. In addition to increasing the sense of unity of the outer layer, a vent hole that communicates between the inner and outer layers is formed on the bottom surface of the outer layer to prevent deformation of the outer layer due to negative pressure, thereby eliminating the above-mentioned drawbacks. The main purpose is to provide.

<Means for Solving the Problems> In order to achieve the above object, the present invention is an integrally molded multi-layer blow container, in which an inner layer and an outer layer are made of a synthetic resin material having no adhesiveness to each other. And has a mouth at the upper end, and pinches off the lower end to form a ridge portion at the center of the bottom surface by crimping the inner layer and the outer layer. The outer layer is engaged with the outer layer in a concavo-convex manner, and the upper end of the inner layer of the mouth is bent so as to cover the upper surface of the outer layer and a part of the outer surface, and the inner and outer layers are engaged at the upper end of the mouth to form the outer layer. It is configured by providing a ventilation hole on the bottom surface of.

<Function> The double container configured as described above has the inner and outer layers simultaneously formed of a synthetic resin material that does not have adhesiveness to each other, but has the upper end portion of the mouth and the pinch-off portion of the lower end. The inner and outer layers can be firmly engaged and coupled to enhance the sense of unity between the two, and it is possible to reliably prevent the inner layer from entering the inner side of the outer container by the outer layer when the content becomes small. At the same time, since the space between the inner and outer layers is communicated with the outside air through the ventilation holes, it is possible to prevent the outer layer from being deformed by negative pressure.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

In the drawings, reference numeral 1 is a double container according to the present invention,
The container 1 comprises a synthetic resin inner layer 2 which does not have adhesiveness to each other.
And a synthetic resin outer layer 3 to form a double structure, and are simultaneously molded by a blow molding device having a double extrusion port.

Thus, the double container 1 has a mouth portion 4 at the upper end, and a downward protruding ridge portion 6 formed by laterally pressure-bonding the inner layer 2 and the outer layer 3 is provided at the center of the bottom surface 5 at the lower end. Has been. The protrusion 6 is formed when the double parison extruded from the nozzle of the molding apparatus is pinched off during blow molding.
Further, in the protruding portion 6, the inner step 2 and the outer step 3 are engaged in concave and convex by pressingly forming the engaging step 6a from the side.

In addition, in the mouth portion 4, the inner layer 2 is bent and formed so as to cover the upper end portion of the outer layer 3 and a part of the outer surface thereof by the upper end portion of the inner layer 2, whereby the inner and outer layers are formed at the upper end portion of the mouth portion 4. Tightly engaged.

Further, the bottom surface of the outer layer 3 is provided with a vent hole 7 communicating between the inner layer 2 and the outer layer 3.

The container shown in the above embodiment is mainly made for convenience as an extruding container for a viscous material such as mayonnaise. Therefore, the inner layer 2 is made of a flexible synthetic resin material, and the outer layer 2 is made of a synthetic resin material having appropriate elasticity and squeezing property (restoring property). Therefore, when the body part of the container is pressed and the contents are pushed out from the mouth part 4 and then the pressing force on the body part is released, outside air flows between the inner layer 2 and the outer layer 3 through the ventilation hole 7 and the outer layer 3 Is restored to its original shape and the container does not deform. Further, the inner layer 2 and the outer layer 3 are firmly engaged with each other by the engaging step portion 6a of the projecting ridge portion 6 at the lower end and the bent engaging portion of the upper end mouth portion 4, so that the inner layer and the outer layer are displaced during use. It is possible to improve the quality of the container without causing such problems.

The container shown in FIG. 4 shows another embodiment of the present invention.
In this embodiment, an extrusion pump 8 for pouring out the contents is fixed to the mouth 4 of the double container 1 via a coupling 9 or the like. This pump has an air bagless structure in which the volume inside the container is reduced according to the amount of contents poured out, and the push button 10 is mounted against the spring (not shown in the figure but mounted inside the pump). Nozzle by pushing down
Push the contents out of 11. Thereby, the volume of the inner layer 2 is reduced according to the amount of pouring out, but since the space between the inner layer 2 and the outer layer 3 is communicated with the outside air through the ventilation hole 7, the outer layer 3 is not deformed without receiving negative pressure. do not do. Therefore, in this example,
The synthetic resin material forming the outer layer 3 does not necessarily have to be a flexible material, and may be formed of a material having hardness and thickness sufficient to maintain the shape of the container.

Incidentally, in the present invention, the inner layer 2 is
It is also possible to form with a laminated structure of a plurality of layers.

<Effect of the Invention> As described in detail above, the present invention is an integrally molded multi-layer blow container, in which the inner layer and the outer layer are made of a synthetic resin material having no adhesiveness to each other, and a mouth portion is provided at the upper end. And a pinch-off of the lower end to form a ridge portion in which the inner layer and the outer layer are pressure-bonded to each other in the center of the bottom surface, and an engaging step portion is formed on the ridge portion from the side so that the inner layer and the outer layer are engaged in a concavo-convex manner. At the same time, the inner layer upper end portion of the mouth portion is bent so as to cover the upper surface of the outer layer upper end portion and a part of the outer side surface, the inner and outer layers are engaged at the mouth portion upper end portion, and a vent hole is further formed on the bottom surface of the outer layer. Since it was provided and configured,
Even though the outer layers are simultaneously molded with synthetic resin materials that do not have adhesiveness to each other, the inner and outer layers are firmly engaged and connected at the upper end portion of the mouth and the pinch-off portion at the lower end, and a sense of unity between the two is obtained. Therefore, it is possible to reliably prevent the inner layer from entering the inside of the outer container due to the outer layer when the content becomes small, thus eliminating the conventional drawbacks described at the beginning. At the same time, since the space between the inner and outer layers communicates with the outside air through the ventilation holes, there is an effect that the outer layer can be prevented from being deformed due to negative pressure.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a mouth portion, FIG. 3 is an enlarged sectional view of a ridge portion, and FIG. 4 is a portion showing another embodiment. It is a cross-sectional front view. 1 is a container, 2 is an inner layer, 3 is an outer layer, 4 is a mouth portion, 5 is a bottom surface,
6 is a ridge, 6a is a step, and 7 is a vent hole.

Claims (1)

[Scope of utility model registration request] 1. A multi-layer blow container integrally molded, wherein an inner layer and an outer layer are formed of a synthetic resin material having no adhesiveness to each other, an upper end has a mouth portion, and a lower end is pinched off to form a bottom surface. Form a ridge part that crimps the inner layer and the outer layer in the center,
Engaging step portions are formed on the ridges from the side to engage the inner layer and the outer layer in a concave-convex manner, and the inner layer upper end portion of the mouth portion covers the upper surface of the outer layer upper end portion and a part of the outer surface. A double container, which is formed by bending and engaging the inner and outer layers at the upper end of the mouth and further providing a ventilation hole in the bottom surface of the outer layer.