JPH0627558Y2 - Extrusion tube container - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an extruded tube container used for kneading wasabi, kneading and the like, particularly when squeezing the contents of the tube container, squeezing from the nozzle part of the container body. The present invention relates to an extruded tube container that effectively prevents a part of the discharged contents from flowing back into the container body together with air.

[Conventional technology]

Conventionally, this kind of extruded tube container is usually manufactured by extrusion blow molding from a material having a relatively high elasticity such as polyethylene in order to reduce the manufacturing cost.

This kind of extrusion tube container, when squeezing out the contents by pressing the tube body, a so-called air bag that sucks the outside air due to the restoring force of the tube body occurs, and the contents are deteriorated by the air that is air-backed, Alternatively, the contents are dried and cured, and there is a problem in storability. In addition, when an air bag is generated, when the content is squeezed out at the time of the next use, the content is discharged with the air entrained therein, which causes an unpleasant sound.

In order to prevent this air bag, for example, JP-A-59-59
As disclosed in Japanese Patent No. 1631167, an orifice passage and a retention portion are provided between a container body and an outlet nozzle, and a cross-sectional area ratio between the orifice passage and the retention portion is determined according to the viscosity of the contents. It has been proposed to prevent an air bag within a short time until the lid is closed by the orifice passage when the content of the staying portion is absorbed by the elastic recovery force of.

[Problems to be solved by the invention]

The extruded tube container is integrally manufactured by extrusion blow molding of a single-layer or multi-layer thermoplastic resin parison. The orifice passage in the above-mentioned prior art is one in which the parison diameter is meshed with the mold and narrowed from the periphery to form narrow passages of various shapes in the central portion, and although there are differences depending on the viscosity of the contents, the orifice The enclosure of the orifice passage must be narrowed down so that the cross-sectional area of the passage is at least half or less than the cross-sectional area of the retention portion. For this reason, if the cross-sectional area of the orifice passage is simply reduced in order to enhance the effect of preventing air bags, the amount of narrowing during extrusion blow molding will be large, and the amount of burr that will be bitten into the mold as burr and will need to be removed later Has to be large, the wall thickness tends to be thin locally, and when a multilayer laminate resin is used as the container material, it may cause cracks in the barrier layer, causing a decrease in performance such as oxygen barrier properties. Becomes

The present invention aims to solve these problems.

[Means for solving problems]

The present invention squeezes a narrowed portion provided in a passage between a container body and an outlet nozzle from two opposite directions of a peripheral wall of the passage, partially toward the center of the passage, and the inner peripheral surface of the tip portion thereof Are slightly in contact with each other or are opposed to each other with a small space therebetween so that the central portion of the throttle portion is substantially closed to form two separate passages.

[Action]

The present invention does not simply reduce the cross-sectional area of the throttle,
Since the central portion of the axis of the accumulating portion and the container body is closed and a throttle portion consisting of two substantially separated passages is provided, in the conventional example, the frictional resistance with the surrounding wall surface is increased. When the center portion, which is the portion where the suction speed of the contents is the fastest because of the least influence of the above, reaches the narrowed portion, it hits the closed central portion, and its moving direction is bent in the lateral direction. It will be separated into two and divided into two passages, and will return to the container body side through these two passages. Further, the content around the central portion is also divided into two by the squeezing portion, and returns to the container body side through either of the two passages.

For this reason, the shape and movement direction of the contents during the passage from the retention portion to the throttle portion become large, the resistance of the passage and the frictional resistance between the contents become large, and the suction speed becomes slow. Therefore, the suction speed of the contents can be slowed down as compared with the conventional example in which the cross-sectional area ratio between the retention portion and the throttle portion is the same.

Further, according to the present invention, the squeezed portion is formed by partially squeezing the peripheral wall of the passage between the container body and the outlet nozzle from two opposite directions toward the center of the passage. When molding by the cheapest extrusion blow molding method, it is not necessary to bite the parison of the narrowed portion into the mold as burrs, and there is no possibility of locally forming a thin portion.

〔Example〕

 1 to 3 show one embodiment of the present invention.

FIG. 1 is a sectional view of the entire extrusion tube in the axial direction, in which 1 is a container body, 2 is an outlet nozzle, 3 is a screw for attaching a cap screw, 4 is a retaining portion, 5 is a throttle passage 6, 6 ′. It is a narrowing part for forming.

These are mainly composed of a relatively highly elastic synthetic resin such as polyethylene, and have a gas barrier property.
It is formed integrally by extrusion blow molding of a synthetic resin having a laminated structure of 6 layers.

FIG. 2 shows an enlarged view of the neck portion of the extruded tube of the present invention, and its AA cross section is shown in FIG. During blow molding of the synthetic resin parison, in order to form the narrowing passages 6 and 6 ', the convex molds are engaged from the left and right, and the two inner surfaces of the narrowing portion 8 are narrowed toward each other so that the inner surface of the narrowed portion 8 has a slight complication. The squeezing portion 5 is formed so as to come into contact with or to face each other with a small gap. If the angle of the narrowed portion 5 is, for example, 35 °, the total cross-sectional area of the passages 6 and 6 ′ can be 1/2 or more of the cross-sectional area of the passage before narrowing.

After the tube is integrally molded, a lid is screwed on the screw 3 to seal the outlet nozzle 2, the contents are filled, and then the bottom portion 7 is sealed.

If the content has a viscosity of about 20000 centipoise, such as kneaded wasabi or kneaded mustard, when it is extruded from a tube, the cross-sectional area of the throttle passages 6 and 6'is large, so the content is large. It easily passes through the narrowed portion from the container body having the diameter, passes through the retaining portion 4 having the screw 3 on the outer periphery, and is extruded from the outlet nozzle 2 to the outside.

When the finger is released from the tube, the elastic recovery force of the container body 1 sucks the contents in the outlet nozzle 2 and the retaining part 4 toward the container body, but the contents in the cylindrical retaining part 4 having a small diameter. Since the central portion of the passage is closed by the tip 8 of the narrowed portion, the passage is divided into both passages 6 and 6'having a substantially fan-shaped cross section and tries to return to the container body side. However, when returning the contents, the flow velocity is reduced because the influence of frictional resistance with the wall surface around the container is the smallest, and the flow velocity decreases because the central part of the normal container through which the central part of the contents passes is blocked. . Furthermore, the throttle passage is divided into two, and the content is sucked in two directions against the viscosity of the content itself (friction resistance between the content), so that the flow velocity of the content becomes slow due to the resistance.

Therefore, even if the cross-sectional areas of the throttle passages 6 and 6'are larger than those of the above-mentioned conventional example, the air bag can be effectively prevented, and since there are two throttle passages, the friction during suction is reduced. Even if there is a difference in resistance and one of them is blocked, the passage amount of the contents can be regulated in the other passage, so that the prevention of the air bag is not hindered.

FIG. 4 shows another embodiment of the diaphragm unit.
Is based on an elliptical neck cross-section as shown by the broken line,
The narrowed portion is provided from the opposite sides in the minor axis direction to form the narrowed portion 9.

With this shape, the amount of deformation of the parison due to the mold at the time of extrusion blow molding is small, and there is little risk of breakage of the laminate layer and uneven thickness.

FIG. 1B shows a squeezing section 10 based on a square shape, and FIG. 1C shows a squeezing section 11 based on a hexagonal shape. As described above, as the shape before providing the narrowed portion 5, an appropriate shape such as a circle, an ellipse, a square, or a polygon can be selected.

[Effect of device]

According to the present invention, the throttle passage substantially closes the central portion,
Since the two passages are separated from each other, the air bag can be effectively prevented even if the total cross-sectional area of the throttle portion is relatively large as compared with the conventional example.

When an extrusion tube container is manufactured by extrusion blow molding, the shape of the drawn portion is simplified and the molding process is easy, and there is no need to make a part that is caught in the mold as a burr. There is no risk of cracks or thin parts in the material, and performance such as oxygen barrier properties does not deteriorate.

Further, it is not necessary to form burrs to be removed later in the narrowed portion, and the thickness of each portion is substantially uniform, so that the shape does not have a special thick portion, so that the productivity is improved.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view, FIG. 2 is an enlarged external view of a neck portion, and FIG. 3 is a sectional view taken along line AA of FIG. It is a figure. Fig. 4 A, B,
C is a sectional view showing another embodiment of the throttle passage. 1; Container body 2; Exit nozzle 3; Lid mounting screw 4; Retaining portion 5; Narrowing portion 6, 6 '; Throttling passage

Claims (1)

[Scope of utility model registration request] 1. A flexible synthetic resin extruding tube for locally narrowing a passage between a container body filled with viscous contents and an outlet nozzle to form a narrowed portion, An extruding tube container characterized in that the peripheral wall of the passage is partially narrowed from two opposite directions toward the center of the passage to form two passages substantially separated from each other.