JPH0582850U - Structure of the mouth of a plastic bottle - Google Patents

Abstract

(57) [Summary] [Purpose] The amount of the sharply melted protruding portion generated on the inner edge of the heat-sealing surface is small, and even if it occurs, the upper lip of the drinker does not directly contact the inner tip of the heat-sealing surface. Also, to provide a good heat seal, provide a stable opening strength, are easy to open, and provide a structure of the mouth of a plastic bottle that does not cause anxiety or discomfort to a drinker. [Structure] A tip portion of the mouth portion 3 has an annular shape around a center line 8 of the mouth portion 3, and an inner portion of the tip portion is formed in a divergent shape. After the plastic bottle 1 is filled with the liquid contents, the heat-sealing lid 14 is supplied to the container mouth portion 3 and placed on the heat-sealing surface 7. In this state, the heat seal lid 14 is heated and pressed, and the heat seal lid 14 is welded to the heat seal surface to seal the container mouth portion 3. When the liquid contents are to be taken out, the heat seal lid 14 is peeled from the sealing surface with the fingers of a person to open the container mouth 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of the mouth of a plastic bottle in which the mouth is sealed with a heat-seal lid.

[0002]

[Prior Art]

 Some plastic containers filled with soft beverages that do not contain gas components that generate internal pressure have their mouths sealed with a heat-seal lid. In such a plastic bottle, a molded plastic bottle is filled with liquid contents, a heat-seal lid is supplied to the mouth portion, and the heat-seal lid is heated and pressed to be welded to the mouth portion. When taking out the contents, peel off the heat-seal lid from the container mouth with your fingers and pour out the contents. In this case, the human lips come into direct contact with the mouth of the container. As shown in FIG. 3, the structure of the heat-sealed mouth portion in the conventional container is such that the mouth portion 103 has a cylindrical shape around the center line 108, and the tip of the mouth portion 103 is heat-sealed. The heat seal 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 in a direction closer to the center line 108 toward the upper side of the mouth part. Therefore, the heat seal surface 111 is perpendicular to the centerline 108, but the inner edge 115 of the heat seal surface 111 forms a sharp point.

[0003]

[Problems to be solved by the device]

 When the heat-sealing lid is heat-sealed to such a heat-sealing surface 111, the melt-extruded portion 16 due to the seal is generated on the inner edge 115 of the heat-sealing surface 111, and even after the heat-sealing lid is peeled off, the heat-sealing surface 111 of the heat-sealing surface 111 is removed. It remains on the inner edge 115. The melted-extrusion portion 16 not only hinders the smooth flow of the content liquid when the content liquid is drunk, but also may hit the upper lip of a person. Since the inner edge 115 of the heat-sealing surface 111 is sharp and the melt-extruded portion 16 is also sharp, it may give the drinker anxiety and discomfort by hitting the upper lip of the drinker. In order to avoid the appearance of a sharp tip portion of the inner edge 115 of the heat seal surface 111, the heat seal portion 107 at the tip of the container mouth is not inwardly inclined toward the center line 108, but as shown in FIG. It was conceivable to form the heat-sealed portion 107b that was erected substantially parallel to the above.

However, it is unavoidable that the container mouth portion having the heat seal portion 107b that rises in parallel with the newly considered center line 108 forms a sharp leading end portion on the inner edge 115b of the heat seal portion 107b. However, the amount of the melt-extruded portion 16 due to the seal is still large, so that the lip contact is poor, and the heat-sealing portion 107b rises in parallel with the center line 108. As a result, the area of the heat-sealing surface 111b perpendicular to the center line 108 is small. As a result, the conditions for heat sealing become strict and the opening strength fluctuates greatly. For example, the opening strength is in the range of 1.1 to 2.0 kg, and the opening strength varies widely and the opening performance is poor. For this reason, 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 of the heat-sealing surface, and there is little melted-out portion due to sealing. A large area of the heat seal surface can be secured, the conditions for heat sealing are eased, good heat sealing is realized, the opening strength is stable and easy to open, and the drinker feels anxiety and discomfort. It is desired to develop a structure for the mouth of a plastic bottle that does not have the above.

The present invention has been made in view of the above circumstances and has a small amount of a sharp melt-extruded portion on the inner edge of the heat-sealing surface, and the upper lip of a person who drinks even if the melt-extruded portion occurs. Does not come into direct contact with the inner tip of the heat-sealing surface, and there are few melt-extruded parts due to the seal, making it possible to secure a large area for the heat-sealing surface, relaxing the conditions for heat-sealing, and ensuring good heat It is an object of the present invention to provide a structure of a mouth portion of a plastic bottle that realizes a seal, has a stable opening strength, is easy to open, and does not cause anxiety or discomfort to a drinker.

[0006]

To solve this problem, the structure of the mouth of the plastic bottle of the present invention is such that the tip of the mouth has an annular shape around the center line of the mouth. It is characterized in that the inner part of is formed in a divergent shape.

[0007]

[Action]

 After the liquid contents are filled in the plastic bottle, the heat-sealing lid is supplied to the container mouth and placed on the heat-sealing 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 mouth of the container. When a person drinks the liquid content or takes out the liquid content, the heat seal lid is peeled from the sealing surface with the fingers of the person, and the container mouth is opened. Since the heat-sealing part is well performed, there is no variation in the sealing strength, and the opening is performed smoothly and the spilling of the content liquid does not occur. Even if there is a small amount of melted extruded portion, and even if there is a melted extruded portion at the inner edge of the heat seal surface, the sharp melted extruded portion does not come into direct contact with the lips, making the drinker feel uncomfortable and uncomfortable. Is not given. Furthermore, since there is a ring part that protrudes inward below the heat seal part, this ring part acts as a guard against the inner edge of the seal, and the upper lip of a person is protected by this ring and contacts the tip of the heat seal surface. There is no.

[0008]

【Example】

 Hereinafter, the details of the present invention will be described with reference to the drawings showing one embodiment. In FIG. 1 and FIG. 2, 1 is a plastic bottle, which can be filled with liquid contents and the like. The plastic bottle 1 has a mouth 3 at the upper end. The mouth portion 3 has a tubular shape around the center line 8. The mouth portion 3 is continuous with the body portion 9 of the plastic bottle 1 through the neck portion 4. The mouth portion 3 is provided with a base portion 5, a guard bead portion 6, and a heat seal portion 7 which are continuous in the axial direction, which are connected in the axial direction. The base portion 5 has an annular shape around the center line 8 and also has a shape curved outward. The guard bead portion 6 has an annular shape around the center line 8 and projects inward. The base portion 5 and the guard bead portion 6 continuously form a bellows shape in the direction of the center line 8 and function as a cushion against pressure during heat sealing.

The heat seal portion 7 is located at the upper end of the guard bead portion 6, and the tip end surface in the direction of the center line 8 constitutes the heat seal surface 11, and the heat seal surface 11 is perpendicular to the center line 8. . The guard bead portion 6 has an arcuate curved inner surface whose central portion 10 is closest to the center line 8 in a vertical cross-sectional shape in a plane including the center line 8, and accordingly, the upper end portion of the inner surface 13 thereof has a heat It is continuous with the inner edge 19 of the seal portion 7, and the inner edge 19 forms a boundary between the heat seal surface 11 and the inner surface 13. The inner surface 13 moves away from the center line 8 as it goes upward in the axial direction of the center line 8. Leaning against. In this way, 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 at a right angle to the center line 8, so that the heat sealing surface 11 is heat sealed as in the conventional case. Moreover, the area is larger than that in the case of being parallel to the center line 8.

In the case of heat-sealing the mouth portion 3 configured in this way with the heat-sealing lid 14, the plastic bottle 1 filled with the content liquid is carried to the heat-sealing port, the heat-sealing lid 14 is supplied, and heat is applied. The seal lid 14 is heated and pressed onto the heat seal surface 11 from above to weld the heat seal lid 14 to the heat seal surface 11. When the contents are taken out, the heat-seal lid 14 is peeled off with a finger of a person to open the mouth 3.

[0011]

【The invention's effect】

 In the structure of the mouth of the plastic bottle 1 of the present invention, since the heat-sealing surface 11 is formed at the upper end of the guard bead portion 6 which is inclined with respect to the center line 8, the guard bead portion 6 is formed at right angles. The surface area is larger than when it rises vertically and parallel to the center line 8. Therefore, the heat-sealing conditions are relaxed and good heat-sealing is possible, so that the opening strength is stable. It is stable at 1.2 kg and easy to open. Moreover, since the guard bead portion 6 is formed in a divergent shape, the person's upper lip does not feel uncomfortable or anxious even if the person's upper lip contacts the inner surface of the heat-sealing surface 11. Further, as a result of the large area of the heat-sealing surface 11, the amount of the melt-extruded portion 16 is small, which also makes the lip contact with the upper lip of the person good. Further, since the guard bead portion 6 projects inward and guards the inner edge of the heat seal surface 11, the upper lip of a person may be directly contacted with the guard bead portion 6 and directly contact the inner edge of the heat seal portion 7 and the melt protruding portion 16. Since it does not exist, it does not cause discomfort or insecurity in the upper lip of a person.

[Brief description of drawings]

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

FIG. 2 is a vertical cross-sectional explanatory view of a mouth portion of a plastic bottle.

FIG. 3 is an enlarged explanatory view of a vertical section of the mouth of a conventional plastic bottle.

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

[Explanation of symbols]

 1 Plastic Bottle 3 Mouth Part 4 Neck Part 5 Base Part 6 Guard Bead Part 7 Heat Seal Part 8 Centerline 9 Body Part 10 Central Part 11 Heat Seal Surface 13 Inner Surface 14 Heat Seal Lid Part 16 Melt Protrusion Part 19 Inner Edge 103 Mouth Part 107 (107b) Heat seal part 108 Center line 111 (111b) Heat seal surface 115 (115b) Inner edge

Claims (1)

[Scope of utility model registration request] 1. A mouth portion of a plastic bottle, wherein a tip portion of the mouth portion is formed in an annular shape around a center line of the mouth portion, and an inner portion of the tip portion is formed in a divergent shape. Structure.