JP2569575Y2 - Plastic bottle mouth structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a mouth portion of a plastic bottle in which the mouth portion is sealed by a heat seal lid.

[0002]

2. Description of the Related Art There is a plastic container for filling a soft drink containing no gas component for generating an internal pressure, in which the mouth is heat-sealed with a heat-sealing lid.
In such a plastic bottle, the molded plastic bottle is filled with a liquid content, a heat seal lid is supplied to the mouth, and the heat seal lid is heated and pressurized to be welded to the mouth. When taking out the contents, the heat seal lid is peeled off from the mouth of the container with fingers or the like, and the contents are poured out. In this case, the person's lips directly touch the mouth of the container. As shown in FIG. 3, the structure of the heat-sealed mouth of the conventional container is such that the mouth 103 has a cylindrical shape around the center line 108, and the tip of the mouth 103 is heat-sealed. The heat sealing surface 111 of the seal portion 107 is configured. The heat seal portion 107 is slightly inclined toward the center line 108 of the container mouth portion in a direction approaching the center line 108 as it goes above the mouth portion. Therefore, the heat seal surface 111 is perpendicular to the center line 108, but the heat seal surface 1
The inner edge 115 of 11 has a sharp point.

[0003]

When a heat seal lid is heat-sealed to such a heat seal surface 111, the molten protruding portion 16 of the heat seal surface 111 is heat-sealed.
1 and remains on the inner edge 115 of the heat seal surface 111 even after the heat seal lid is peeled off. The molten protruding portion 16 not only impedes the smooth flow of the content liquid when drinking the content liquid, but may also hit the upper lip of a person. Since the inner edge 115 of the heat seal surface 111 is sharp and the molten protruding portion 16 is also sharp, the hit on the upper lip of the drinker may give the drinker anxiety and discomfort. Heat sealing surface 111
In order to avoid the appearance of a sharp tip portion of the inner edge 115 of the container, the heat seal portion 107 at the tip of the container mouth is placed inside the center line 1.
The heat seal portion 107 raised almost in parallel with the center line 108 as shown in FIG.
It was considered to form b.

However, this newly considered center line 10
The container opening having the heat seal portion 107b rising parallel to 8 could avoid forming a sharp tip at the inner edge 115b of the heat seal portion 107b, but the melted portion 16 by the seal was still more, so the lip The contact is poor, and the heat seal portion 107b is
As a result, the area of the heat sealing surface 111b perpendicular to the center line 108 is reduced, and as a result, the heat sealing conditions become strict and the opening strength varies widely. It is in the range of 0 kg, and the unsealing property is poor due to a large variation in opening strength. Because of this, no sharp tip appears on the inner edge of the heat sealing surface, the upper lip of the drinker does not directly contact the inner tip surface of the heat sealing surface, and there is little melting protrusion due to the seal. A large area of the heat seal surface can be secured, the conditions of heat seal are relaxed, good heat seal is realized, the opening strength is stable and easy to open, and it gives the drinker anxiety and discomfort. There is no need to develop a structure for the mouth of a plastic bottle.

The present invention has been made in view of the above-mentioned circumstances, and has a small amount of a sharply protruding portion on the inner edge of the heat sealing surface. Does not directly contact the inner end surface of the heat seal surface, and there are few protruding parts due to the seal, and a large area of the heat seal surface can be secured. An object of the present invention is to provide a structure of a mouth portion of a plastic bottle which realizes a seal, has a stable opening strength, is easy to open, and does not give a feeling of uneasiness or discomfort to a drinker.

[0006]

In response to this object, the structure of the mouth portion of the plastic bottle according to the present invention is such that a guard bead is formed at the mouth portion of the plastic bottle so as to make one round around the center line of the mouth portion. and, the inner surface of the guard bead said
The cross-sectional shape on a plane including the center line bulges toward the center line in an arc shape, and the inner surface of the upper end of the guard bead is
The farther upward in the direction of the center line, the further away from the center line
It is formed in a divergent shape so that the upper end surface of the mouth portion
The inner edge is reached, and the upper end surface constitutes a heat sealing surface perpendicular to the center line.

[0007]

After the plastic bottle has been filled with the liquid contents, a heat seal lid is supplied to the opening of the container and placed on the heat seal surface. In this state, heat and pressure are applied to the heat seal lid, and the heat seal lid is welded to the heat seal surface to seal the container opening. When taking out the liquid content, for example, when the person drinks the liquid content, the heat sealing lid is peeled off from the sealing surface with the finger of the person, and the container opening is opened. Since the heat-sealing portion is satisfactorily performed, there is no variation in the sealing strength, the opening is performed smoothly, and the leakage of the content liquid does not occur. Even though the amount of the protruding portion is small, and even if the protruding portion exists at the inner edge of the heat sealing surface tip, the sharp protruding portion does not directly contact the lips, giving the drinker anxiety and discomfort Never. In addition, since there is a ring portion protruding inward below the heat seal portion, this ring portion acts as a guard against the inner edge of the seal, and the upper lip of the person is guarded by this ring and it is not possible to contact the tip of the heat seal surface. Absent.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings showing one embodiment. 1 and 2, reference numeral 1 denotes a plastic bottle, which can be filled with a liquid content or the like. The plastic bottle 1 has a mouth 3 at the upper end. Mouth 3
Has a cylindrical shape around the center line 8. Mouth 3 is neck 4
Through the body 9 of the plastic bottle 1. The mouth 3 is provided with an axially continuous base 5, a guard bead 6, and a heat seal 7 connected in the axial direction. The base 5 has an annular shape around the center line 8 and a shape curved outward. The guard bead portion 6 has an annular shape around the center line 8 and has a shape protruding inward. The base portion 5 and the guard bead portion 6 form a bellows shape continuously in the direction of the center line 8 and function as a cushion against pressure during heat sealing.

The heat sealing portion 7 is located at the upper end of the guard bead portion 6, and the front end surface in the direction of the center line 8 forms a heat sealing surface 11, and the heat sealing surface 11 is perpendicular to the center line 8. . The guard bead portion 6 has a curved inner surface on a circular arc whose central portion 10 is closest to the center line 8 in a longitudinal sectional shape in a plane including the center line 8, so that the upper end of the inner surface 13 is a heat seal portion. 7, the inner edge 19 forms a boundary between the heat sealing surface 11 and the inner surface 13, and the inner surface 13 moves away from the center line 8 so that the inner surface 13 is further away from the center line 8 in the axial direction above the center line 8. Leaning. Thus, the inner surface 13 of the guard bead portion 6 is inclined with respect to the center line 8, while the heat sealing surface 11 is perpendicular to the center line 8.
The area is larger than in the case where the heat seal is parallel to the center line 8 as in the conventional case.

In the case where the opening 3 thus constructed is heat-sealed by the heat-sealing lid 14, the plastic bottle 1 filled with the content liquid is carried to the heat-sealing port, and the heat-sealing lid 14 is supplied. The heat is applied to the heat seal surface 11 by heating and pressing the seal cover 14 from above, and the heat seal cover 14 is welded to the heat seal surface 11. When the contents are to be taken out, the heat seal lid 14 is peeled off with a finger of a person to open the mouth 3.

[0011]

In the structure of the mouth of the plastic bottle 1 of the present invention, the heat sealing surface 11 is formed at the upper end of the guard bead portion 6 inclined with respect to the center line 8 at right angles to the center line 8. The guard bead portion 6 has a larger surface area as compared to the case where the guard bead portion 6 stands up vertically and parallel to the center line 8,
Accordingly, the conditions for heat sealing are relaxed and good heat sealing is possible, so that the opening strength is stable, for example, the opening strength is stable at 1.0 to 1.2 kg, and the opening is easy. Moreover, since the guard bead portion 6 is formed in a flared shape, even if the upper lip of the person comes into contact with the inner surface of the heat sealing surface 11, the upper lip of the person does not feel uncomfortable or uneasy. Also, as a result of the heat sealing surface 11 having a large area, the amount of the protruding portion 16 is also small, which likewise improves the lip contact with the upper lip of a person. Further, since the guard bead portion 6 projects inward and guards the inner edge of the heat sealing surface 11, the upper lip of the person is guarded by the guard bead portion 6 and the heat sealing portion 7
Since there is no direct contact with the inner rim and the protruding portion 16 of the body, no discomfort or anxiety is given to the upper lip of a person.

[Brief description of the drawings]

FIG. 1 is a front view of a plastic bottle.

FIG. 2 is an explanatory longitudinal sectional view of a mouth portion of a plastic bottle.

FIG. 3 is an enlarged vertical cross-sectional explanatory view of a mouth portion of a conventional plastic bottle.

FIG. 4 is an enlarged vertical cross-sectional explanatory view of a mouth portion of a conventional plastic bottle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plastic bottle 3 Mouth 4 Neck 5 Base 6 Guard bead part 7 Heat seal part 8 Center line 9 Body part 10 Center part 11 Heat seal surface 13 Inner surface 14 Heat seal lid 16 Melt protruding part 19 Inner edge 103 Mouth 107 (107b) Heat seal portion 108 Center line 111 (111b) Heat seal surface 115 (115b) Inner edge

Claims (1)

(57) [Scope of request for utility model registration] 1. A guard bead is formed at the mouth of a plastic bottle so as to make one round around a center line of the mouth, and an inner surface of the guard bead has an arc-shaped cross section on a plane including the center line . Bulges toward the center line so that the inner surface of the upper end of the guard bead goes upward in the center line direction.
It is formed in a divergent shape away from the center line , reaches the inner edge of the upper end surface of the mouth, and the upper end surface constitutes a heat sealing surface perpendicular to the center line. Plastic bottle mouth structure.