JPH0544842U - Neck structure of tube container - Google Patents

Abstract

(57) [Abstract] [Purpose] In a tube container with a covering part covering the shoulder, neck and spout, prevent water from accumulating on the surface of the spout opening / closing part of the covering part by retort sterilization. Make sure that the opening / closing part is torn cleanly. [Structure] The surface of the spout opening / closing portion of the covering component and the upper end surface of the neck are on the same plane, and an inward step is provided at the upper end of the neck covering.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a tube container in which the inner surface of the synthetic resin neck and shoulder of the tube container is covered with a covering part molded from a laminated material composed of an aluminum foil and a synthetic resin layer, and the spout is closed. It relates to the neck structure of.

[0002]

[Prior Art]

 A tube container having the above-mentioned neck structure is disclosed in JP-A-60-172659. As shown in FIG. 3, the container is made of a laminated material in which a shoulder 2 and a neck 3 made of synthetic resin, which are connected to the laminated body 1 of the tube container A, have synthetic resin layers on both sides of an aluminum foil. Is covered with the covering part 4 and the spout 5 is closed by the covering part 4. The covering component 4 includes a shoulder covering portion 4a, a neck covering portion 4b, and a spout closing portion 4c. The synthetic resin neck portion 3 projects upward from the male screw portion 3a and the spout closing portion 4c. And an annular protrusion 3c forming 3b. An example of a cap screwed to the neck of the above structure is shown in FIG. In FIG. 4, the cap B has a female screw 6a that is screwed into the male screw portion 3a on the inner surface, and a protrusion 6b that abuts the top surface of the annular protrusion 3c on the lower surface of the boundary wall 7. It comprises a part 6 and a breaking part 8 having a conical part 8a for breaking the spout 4c on the upper surface of the boundary wall 7.

[0003]

[Problems to be solved by the device]

 The neck of Fig. 3 was retort-treated to sterilize the contents filled with a tube container with the cap of Fig. 4 firmly screwed, and after cooling to room temperature, Cap B was removed. It has been found that there is water in the part formed by the closed portion 4c and the annular protruding portion 3c. Therefore, a neck portion having a shape excluding the annular protruding portion above the dashed-dotted line C-C in FIG. 3 was experimentally manufactured. The cap B shown in FIG. 4 was screwed onto this neck portion and subjected to retort treatment. With this shape, even if water was present on the spout closing part 4c, it could be easily removed. However, the inner end portion 3e of the top surface of the neck portion 3 shown in FIG. 5 is in a peeled state or easily peeled off from the spout closing portion 4c of the covering component 4, and is completely separated when breaking the spout closing portion 4c, It turned out that there was a problem that the appearance after breaking was extremely poor. In other words, the covering component 4 is made of a material that is as thin as possible because it can be used by breaking the spout closing portion 4c during use, and therefore it is extremely difficult to form it by press molding, and the spout 5 of the covering component 5 is used. The larger the radius of curvature of the tip corner 4r, the easier the molding. However, if the radius of curvature of the tip corner of the spout 5 is increased, the inner end portion 3e of the top surface of the neck 3 described above becomes larger, and the temperature of the inner end portion 3e tends to decrease during molding, and the coating Since the adhesive strength with the component 4 becomes weak, there is a problem in that it easily peels off.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the neck portion of the present invention has the surface of the spout closing portion of the covering component and the upper end surface of the neck portion on the same plane, and is directed radially inward to the upper end portion of the neck covering portion. The structure has an annular inward step portion whose diameter is reduced.

[0005]

[Action]

 Since the neck portion of the present invention has the above structure, water on the spout closing portion 4c can be easily removed, and the thin inner end portion 3e shown in FIG. The welding is uniform and strong, and peeling does not occur when the spout closing portion 4c is broken.

[0006]

【Example】

 An embodiment of this invention will be described with reference to FIG. In FIG. 1, 1, 2, 3, 4, 4a, 4b, 4c, 5 and A are the same as those denoted by the same reference numerals in FIG. The covering component 4 has an inwardly facing step portion 4d formed in an annular shape at the upper end portion of the neck covering component 4b by reducing the diameter of the neck covering component 4b inward in the radial direction. Has an annular protrusion 3d extending inward in the radial direction, and the step 4d and the annular protrusion 3d are adhered to each other. As shown in FIG. 2, the covering component 4 is formed by using a core mold 10 having a stepped portion 11 at an upper end thereof, and a connecting portion 4R between the spout closing portion 4c and the neck covering component 4b having an arcuate shape. The article 4 is covered, air is sucked from the suction passage 12 opening to the step portion 11 to draw the connecting portion 4R to the step portion 11 and molded, and a molten synthetic resin is injected by a well-known method using this covering part 4. Then, the neck and shoulder were integrally molded to manufacture the neck having the structure shown in FIG.

The coated component 4 of this embodiment has an aluminum foil as an intermediate layer, a synthetic resin film layer on the inner surface side, and an adhesive layer on the outer surface side that adheres well to the resin of the neck portion. Manufactured by a deep-drawing method, the step portion 4d has a depth h of 1 mm, a width w of 1 mm, the corners of the core die 10 are chamfered, and the rising portion 13 at the upper end is cylindrical. And Further, the surface of the spout closing portion 4c and the upper end surface 3f made of synthetic resin are formed to be flush with each other. Water adhered on the spout closing portion 4c of the neck after the retort treatment, but it could be easily and cleanly removed by wiping. Further, since the inwardly facing step portion 4d was always trying to expand outwardly, there was no peeling of the coated component when the spout closing portion ruptured, and it easily broke, and the shape after rupturing was good.

In addition, even if the upper end surface of the neck made of synthetic resin is slightly above the surface of the spout closing part 4c, water in the range where the water on the spout closing part 4c can be easily wiped off is The surface of the outlet block and the upper end of the neck are substantially coplanar and are within the scope of this invention.

[0009]

[Effect of the device]

 Since the neck portion of the present invention has the above structure, the water on the spout closing portion can be easily and cleanly removed. Therefore, when the contents of the tube container are poured out, water is not mixed and it is sanitary. Further, when the spout closing portion is broken, the peripheral edge of the spout closing portion is not separated from the neck portion, and the spout can be broken easily and neatly, and the appearance after the breaking becomes good. Furthermore, when the coated parts are made by the deep drawing method, it is possible to make the radius of curvature of the spout closing part corner of the coated parts larger and then to make the inward step so that they can be easily formed. When it is necessary to make a container with a small spout, make the diameter of the neck covering part of the covering part large so that it can be easily molded, and obtain the desired small spout diameter when making an inward step. It has the additional effect of being able to

[0010]

[Brief description of drawings]

FIG. 1 is a front sectional view of an embodiment of the present invention.

FIG. 2 is an upper front view of the neck molding core die shown in FIG.

FIG. 3 is a front sectional view of a conventional example.

FIG. 4 is a front sectional view of an example of a cap.

FIG. 5 is a front partial cross-sectional view of the neck part with the upper part removed from the line CC in FIG.

[Explanation of symbols]

A tube container 2 shoulder 3 neck 4 covering part 4c spout closing part 4d inward step

Claims (1)

[Scope of utility model registration request] 1. A tube container in which a synthetic resin neck portion and an inner surface of a shoulder portion of the tube container are covered with a covering component made of a laminated material having a synthetic resin layer on both sides of an aluminum foil, and a spout is closed. In the neck, the surface of the spout closing part of the covering part and the upper end surface of the neck are substantially coplanar, and an annular inward direction radially inward is reduced at the upper end of the neck covering. A neck structure of a tube container having a step.