JPH0621868Y2 - 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 horseradish, kneading powder, etc., especially near the nozzle part of the tube container when squeezing out the contents of the tube container. The present invention relates to an extruded tube container that effectively prevents a part of a certain content from flowing back into the container body together with air.

[Conventional technology]

Conventionally, this type of extruded tube container is usually manufactured integrally by extrusion blow molding mainly with a material having relatively high elasticity such as polyethylene.

When the tube body is pressed and the contents are squeezed out, the restoring force of the tube body causes a so-called air bag to suck in the outside air, and the air that has been air-backed causes the contents to deteriorate, or the contents dry and harden. Then there was a problem with the 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 retention portion is sucked by the elastic recovery force of the.

[Problems to be solved by the invention]

The tube container for extrusion 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 formed by narrowing the diameter of the parison from the surroundings by meshing with the die to form narrow passages of various shapes in the center, and although there are differences depending on the viscosity of the contents, the orifice The circumference of the orifice passage must be narrowed 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 to increase the effect of preventing the air bag, 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 and Actions for Solving Problems]

The present invention relates to an extruded tube made of a flexible synthetic resin for locally narrowing a passage between a container body filled with a viscous content and an outlet nozzle to form a throttle passage. Two sections are provided in the passage between the main body and the outlet nozzle to make the cross-sectional area of the throttle passage on the container body side larger than the cross-sectional area of the throttle passage on the outlet nozzle side, and to retain on the outlet nozzle side of both throttle passages. It is an extruded tube container provided with a part.

In order to prevent the air bag within a short time until the cap is tightened, the suction speed of the contents may be reduced. In the present invention, since two squeezing passages are provided in the passage between the container body of the extruded tube container and the outlet nozzle, when the fingers are separated from the extruded tube container, they stay on the outlet side of each throttle. The suction speed of the contents to the container body side is reduced in each throttle passage, and the air bag can be effectively prevented.

Therefore, the cross-sectional area of each throttle passage can be made large, and in particular, even if the cross-sectional area of the throttle passage on the container body side is significantly larger than that of the conventional one, the air bag can be effectively prevented, so that the extrusion It is possible to significantly reduce the amount of drawing for forming the drawing passage on the container body side during blow molding.

Furthermore, since the cross-sectional area of the throttle passage is large on the container body side and small on the outlet nozzle side, even if the viscosity of the contents is considerably high,
The contents that have passed through the throttle passage on the container body side due to the pressing of the body of the container must pass through a part of the throttle passage on the outlet nozzle side with a cross-sectional area smaller than the cross-sectional area regulated by this throttle passage. It will be left in the retention part between the throttle passages,
As a result, by the time the required amount of content has been pushed out of the exit nozzle, this debris will be filled with content. Therefore, even if the contents have a high viscosity, the present invention can surely exhibit the air bag prevention effect.

FIG. 1 shows an embodiment of the present invention, in which the right side of the extruded tube container is shown in cross section. Figure 1 (A),
3B is a sectional view taken along the line AA and the line BB of FIG. 1, respectively.

1 is a shoulder portion integrally formed with the extruded tube container body, 2
Is a substantially conical upper retaining portion connected to the outlet nozzle, 3 is a screw for attaching a cap screw, 4 is a lower retaining portion, 5 is an upper narrowing portion for forming an upper throttle passage 7, and 6 is a lower throttle passage 8
Is a lower squeezing portion for forming the.

This extruded tube container is mainly composed of a relatively elastic synthetic resin such as polyethylene, etc., and a synthetic resin having a laminated structure composed of 2 to 6 layers to have a gas barrier property is extruded and blow-molded to be integrated. To form.

Upon extrusion blow molding of the multi-layer synthetic resin parison, circular concave passages 7 and 8 are formed. Therefore, the concave molds are engaged with each other from the left and right sides, and the constricted dies are squeezed from the two opposite directions toward the center to be radially outward. Mold the ribs at the same time.

After the tube is integrally extruded and blow-molded, a lid is screwed on the screw 3 to seal the outlet nozzle, the contents are filled, and then the container bottom is sealed.

The test results of a concrete example according to this embodiment are shown below.

The inner diameter of the upper retaining section 2 is 7.5 mm, the inner diameter of the upper throttle channel 7 is 3.5 mm, the inner diameter of the lower retaining section 4 is 9.5 mm, the inner diameter of the lower throttle channel 8 is 7.0 mm, and the diameter of the container body is 25.0 mm. A tube molded to a thickness of 0.4 mm in the body of the container body is filled with kneaded wasabi, kneading paste, jam, and toothpaste, and tested for the extrusion characteristics of the contents and the backflow prevention effect to prevent air bags. did.

In either case, the contents were extruded smoothly,
The backflow prevention effect varied depending on the contents.
With kneaded wasabi and toothpaste, the body of the tube container body remains in the extruded state even after 30 seconds have passed, but in the case of kneading and jam, the time in which the extruded state is retained is 20 seconds and 15 seconds, respectively. It was in seconds.

Therefore, the inner diameter of the upper throttle passage 7 is changed from 3.5 mm to 3.0 mm.
When tested in a tube container having a size of mm, the body of the container body kept the extruded state for 20 seconds even when the content was a jam.

From this test result, it was found that it is sufficient to change the inner diameter of the upper throttle passage 7 without changing the inner diameter of the lower throttle passage 8 according to the viscosity of the contents.

In this specific example, the lower throttle passage 8 with respect to the lower retention portion 4 is provided.
Has a cross-sectional area of 1/2 or more, and the amount of parison narrowed in the lower narrowing portion 6 by the die during extrusion blow molding is small, causing breakage of the laminate layer and uneven wall thickness in the lower throttle passage portion. There is no fear.

The lower throttle passage is a portion in contact with the container body, and if there is a defect in this portion, the contents may be altered. On the other hand, the upper throttle passage 7 has to be squeezed greatly at the time of molding, but there is the lower retention part 4 and the lower throttle passage 8 on the inner side of this portion, and the contents are present in this portion under normal conditions. Therefore, even if a defect occurs in the peripheral wall portion of the upper throttle passage 7, it has little influence on the contents inside the container body.

FIG. 2 shows another embodiment. Providing throttling passages at two positions above and below the neck of the tube container is the same as in the above embodiment, but the narrowing portions 15 and 16 are formed so that both throttling passages 17 and 18 are substantially rectangular. The upper throttle passage 17 and the lower throttle passage 18 are arranged such that the directions of the rectangles are shifted by 90 °.

In this embodiment, when the contents are sucked into the container body side, the flow of the central portion of the rectangular throttle passage is fast, and the portion which appears as a cavity when the both throttle passages are viewed from the outlet nozzle side is a substantial passage. Therefore, the lower throttle passage 1 is formed.
Even if the ratio of the cross-sectional area of 8 to the cross-sectional area of the lower retention portion is large, the backflow prevention effect is large.

In the embodiment shown in FIG. 3, the upper throttle passage 27 has the same structure as that shown in FIG.
Although it is circular as shown in FIG. 5, the lower throttle passage 28 has narrowed portions 26 reaching from both sides to the center of the passage as shown in FIG. 7B, and the throttle passage is divided into two passages. There is.

In this embodiment, when the content is sucked toward the container body, the speed of the content having a fast flow passing through the central portion of the upper throttle passage 27 is blocked at the central portion of the lower throttle passage 28. Is weakened. Furthermore, if there is a divergence in the lower throttle passage or there is a difference in resistance between the two passages, most of them will flow into one, and the flow resistance will increase synergistically, with a large backflow prevention effect. It is especially effective when the viscosity of the product is high.

In the embodiment shown in FIG. 4, the upper throttle passage 37 is also substantially divided into two passages as shown in FIG.
The same applies to the lower throttle passage 38 shown in FIG. 6B, but the position of the narrowing portion 36 at the time of molding is the same as the narrowing portion 35 of the upper throttle passage.
The position is offset by 90 °.

In the case of this embodiment, since the central part of the upper and lower throttle passages is closed and the dividing direction of the upper and lower passages is deviated, the flow direction is greatly changed, and the resistance against backflow of the contents becomes large. The effect of reducing the flow velocity of the contents and preventing the air bag is great.

The shape of the throttle passage is not limited to the circle and rectangle shown in each embodiment, and may be an ellipse as shown in FIG. An appropriate shape such as a square shape can be selected.

[Effect of device]

In the present invention, since the throttle passages are provided in two places in series, the air bag can be effectively prevented even if the cross-sectional area of each throttle passage is larger than the conventional one.

In particular, the cross-sectional area of the throttle passage on the side that is directly connected to the container body can be made significantly larger than the cross-sectional area of the conventional throttle passage, and the amount of drawing for forming this throttle passage during extrusion blow molding is greatly reduced. Since it is possible to reduce the molding process of the throttle passage on the side directly connected to the container body, there is no risk of producing cracks or thin-walled parts in the tube container constituent part that is directly involved in the tightness of the contents, Performance such as oxygen barrier property does not deteriorate.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, in which the right side of the extruded tube container is shown in cross section. Figure 1 (A),
3B is a sectional view taken along the line AA and the line BB of FIG. 1, respectively. FIGS. 2 to 4 show another embodiment of the present invention. FIGS. 2A and 2B are sectional views taken along the lines AA and BB of the drawings. Is. In the figure, 1 is a shoulder portion of the container body, 2 is an upper retention portion, 3
Is a lid mounting screw, 4 is a lower retaining portion, 5 is an upper narrowing portion, 6 is a lower narrowing portion, 7 is an upper throttle passage, and 8 is a lower throttle passage.

Claims (1)

[Scope of utility model registration request] 1. A flexible synthetic resin extruded tube for locally narrowing a passage between a container body for filling viscous contents and an outlet nozzle to form a throttle passage, wherein Two locations are provided in the passage between the container body and the outlet nozzle so that the cross-sectional area of the throttle passage on the container body side is larger than the cross-sectional area of the throttle passage on the outlet nozzle side. An extruded tube container having a retention part.