JP2008265867A - Seal structure of tube container mouth and cap. - Google Patents

Abstract

A sealing structure of a mouth portion of a tube container and a cap, in which a seal point is provided at a portion other than the opening at the tip of the nozzle portion of the tube container and the lower surface of the top surface portion of the cap.
A tube container (1) and a cap (7) screwed into a mouth part (4) of the tube container (1) are arranged between a male screw of the mouth part (4) and a nozzle part (5) formed above the mouth part. The cap engaging wall is formed with a mouth engaging wall 6 or a mouth engaging projection 6a, and is inserted into the mouth engaging wall 6 or the mouth engaging projection 6a in the axial direction and sealed. 13 or a cap engaging projection 13a is formed on the inner peripheral surface of the cap 7. A sealing structure between the mouth of the tube container and the cap. The sealing function can be reliably ensured at the site of the mouth engaging wall 6 or the mouth engaging projection 6a and the cap engaging wall 13 or the cap engaging projection 13a, which are sites other than the tip of the nozzle portion 5.
[Selection] Figure 1

Description

  The present invention relates to a seal structure between a mouth portion of a tube container and a cap, and more specifically, a tube container having a main seal point at a portion other than the opening at the tip of the nozzle portion of the tube container and the lower surface of the top surface portion of the cap. The present invention relates to a seal structure between a mouth portion and a cap.

Conventionally, as a tube container filled with contents such as a denture stabilizer, there is a tube container with a nozzle as shown in FIG. A tube container having a denture stabilizer as a content is required to have a barrier property, and a nozzle is formed in the upper portion of the tube container mouth so that the content can be easily taken out. In FIG. 13, 50 is a tube container with a nozzle, and the trunk | drum 51 of the tube container 50 with a nozzle is comprised with the laminate material which consists of aluminum foil and resin. The shoulder portion 52, the mouth portion 53, and the nozzle portion 54 are made of a single layer or multilayer resin such as polyethylene, and are welded to the body portion 51 of the laminate material at the lower end of the shoulder portion 52. A nozzle portion 54 continuous from the mouth portion 53 is formed above the mouth portion 53, and a female screw 57 of the cap 56 is screwed into the male screw portion 55 of the mouth portion 53. The opening at the tip of the nozzle portion 54 is closed by screwing the cap 56 into the mouth portion 53. That is, when the cap 56 is tightened to the mouth portion 53, the contact ring 59 formed on the lower surface 58 of the cap 56 strongly contacts the inner wall of the tip portion 54 a of the nozzle portion 54, whereby the tip portion of the nozzle portion 54. Are securely sealed (indicated by an arrow X in FIG. 13). This prevents moisture and fragrance of the denture stabilizer from escaping from the opening at the tip of the nozzle portion 54 to the outside and prevents inflow of outside air into the tube container (see Patent Document 1). And as shown in FIG. 14, when the rotation prevention part 60 for the tightening prevention of the cap 56 is formed in the shoulder part 52 of the conventional tube container with a nozzle, on the lower surface 58 of the top surface 58 of the cap 56 The formation of the contact ring 59 is a necessary condition.
Japanese Patent Application No. 2006-343907

However, the conventional tube container 50 with the nozzle in which the rotation preventing portion 60 is formed on the shoulder portion 52 has the following drawbacks.
(1) As shown in FIG. 14, when the nozzle section 54 has a circular cross section and the center axis is not eccentric, the contact ring 59 can reliably seal the opening of the nozzle section 53. However, when the cross section of the nozzle portion 53 is a square shape, an elliptical shape, a hexagonal shape, or the like, it is impossible to form the contact ring 59 on the lower surface of the top surface 58 of the cap 56. When the contact ring 59 is not formed, there is a problem that the opening of the tip end portion 54 a of the nozzle portion 54 cannot be reliably sealed with the lower surface of the top surface 58 of the cap 56. In this case, since the rotation preventing portion 60 is formed on the shoulder portion 52 of the tube container 50, it is impossible to tighten and tighten the cap 56, and the top surface 58 of the cap 56 is opened at the opening of the tip portion of the nozzle portion 54. Cannot be abutted strongly. Therefore, there is a drawback that a reliable sealing effect by the top surface 58 of the cap 56 cannot be obtained.
(2) Furthermore, the moldability of the nozzle portion 53 may become unstable due to a dimensional error due to factors such as accuracy error of the detent portion 60 during molding. When the cap 56 is screwed, a gap may be formed between the opening at the tip of the nozzle portion 53 and the bottom surface 58 of the cap 56. Also in this case, since the rotation preventing portion 60 is formed on the shoulder portion 52 of the tube container 50 in the same manner as described above, the cap 56 cannot be strongly turned and tightened. There is a drawback that the sealing effect cannot be obtained.
The present invention has been made paying attention to such a problem, and by providing a main seal point at a portion other than the opening at the tip of the nozzle portion of the tube container with a nozzle and the bottom surface of the top surface of the cap, the tube A seal structure between the mouth of the tube container and the cap that prevents moisture and aroma of the contents from escaping to the outside from the opening at the tip of the nozzle of the container and prevents the outside air from flowing into the tube container. It is intended to provide.

  In order to solve this problem, the solution means of the invention described in claim 1 includes a tube container and a cap screwed into the mouth portion of the tube container, and is formed above the mouth portion and the male screw. A cap engaging wall that forms a mouth engaging wall or a mouth engaging projection between the nozzle portion and seals by being thickly inserted in the axial direction with respect to the mouth engaging wall or the mouth engaging projection. Or it is a sealing structure of the mouth part of a tube container and a cap characterized by having formed the cap engaging protrusion on the inner peripheral surface of the cap. With this sealing structure, the opening of the tube container with nozzle can be reliably sealed.

  According to a second aspect of the present invention, there is provided the mouth of the tube container and the cap characterized in that a cap detent is formed on the shoulder of the tube container, on which the engagement protrusion of the cap rides and locks. And a sealing structure. The cap can prevent overtightening of the mouth of the tube container with nozzle.

  According to a third aspect of the present invention, the main seal point is the contact between the mouth engaging wall or the mouth engaging protrusion of the tube container and the cap engaging wall or the cap engaging protrusion. This is a sealing structure between the mouth portion of the tube container and the cap, wherein the contact between the lower surface of the top surface portion and the tip end portion of the nozzle is used as a secondary sealing point. Due to the synergistic effect of the main seal point and the subordinate seal point, the opening of the tube container with nozzle can be surely sealed.

According to a fourth aspect of the present invention, there is provided a sealing structure between a mouth portion of a tube container and a cap, which is a bottle container instead of the tube container.
Needless to say, the present invention can be applied to bottle containers.

According to the present invention, the opening at the tip of the nozzle portion of the tube container and the portion other than the lower surface of the top surface of the cap, that is, the mouth engaging wall or the mouth engaging protrusion, and the cap engaging wall or the cap engaging protrusion. Since the main contact point is the contact point, it is possible to reliably stop leakage of moisture, fragrance and the like of the contents from the opening at the tip of the nozzle portion. Further, not only the entry of outside air can be prevented as much as possible, but also the effect that the quality deterioration of the contents can be minimized as soon as it is opened.
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  Embodiments of the present invention will be described with reference to the drawings.

1 to 4 show a first embodiment of the present invention. In FIG. 1, 1 is a tube container with a nozzle. The tube container 1 with nozzle is made of a laminate material made of an aluminum foil and a resin so that outside air is not mixed from the body part 2 in order to store contents such as a denture stabilizer. It has been. The body 2 of the laminate material is welded to the lower end of the shoulder 3. Note that the body 2 may be, for example, a multilayer resin having a gas barrier resin. A nozzle portion 5 is formed above the mouth portion 4, while an outer tube 8 and an inner tube 9 are formed on the cap 7,
The internal thread formed on the lower inner periphery of the inner cylinder 9 is screwed into the external thread of the mouth 4, and the top surface 10 is formed on the top of the cap 7 to close the opening of the tip 5 a of the nozzle 5. ing.

  Further, as shown in FIGS. 7 and 8, a detent portion 11 of the cap 7 is formed on the shoulder portion 3, and the detent portion 11 includes a pair of large protrusions 11a as shown in FIG. It is comprised from the small protrusion 11b. Then, in the gap 11c between the large protrusion 11a and the small protrusion 11b, the engaging protrusion 12 formed between the outer cylinder 8 and the inner cylinder 9 of the cap 7 rides over the small protrusion 11b in front. Lock. This prevents overtightening of the cap 7 to the mouth 4. When the tube container 1 with a nozzle is molded with a mold, a female mold is placed on the cylindrical laminate material barrel 2, and the molten resin is poured into the female mold to be molded. 2 and the upper end of the shoulder 3 are welded together. At the time of molding, if the length of the nozzle portion 5 is shortened due to resin shrinkage or the like, the tip portion 5a of the nozzle portion 5 and the top surface portion 10 of the cap 7 as shown in FIG. A gap (dimension S in FIG. 4) is generated between the lower surface and the lower surface. In this case, a sealing failure occurs between the opening of the tip portion 5 a of the nozzle portion 5 and the lower surface of the top surface portion 10 of the cap 7.

  Then, this inventor discovered not only the seal | sticker of the opening of the nozzle part 5 front-end | tip part 5a, and the top | upper surface part 10 lower surface of the cap 7, but the seal | sticker in the downward direction (arrow A part of FIG. 1). . That is, as shown in FIGS. 2 and 3, a mouth engaging wall 6 is formed between the male screw of the mouth 4 and the nozzle portion 5 formed above the mouth 4, and the inner periphery of the cap 7. It has been found that the cap engaging wall 13 formed on the surface is engaged in surface contact. The mouth engaging wall 6 and the cap engaging wall 13 are both formed in the entire circumferential direction. Thereby, since the mouth engaging wall 6 and the cap engaging wall 13 can be reliably sealed, the opening of the tip 5a of the nozzle 5 and the lower surface of the top surface 10 of the cap 7 (the arrow B portion in FIG. 1). Even if a sealing failure occurs between the two, the surface contact between the mouth engaging wall 6 and the cap engaging wall 13 can surely stop the leakage of moisture, aroma, etc. of the contents to the outside. .

    FIG. 5 is a drawing showing Example 2 of the present invention. A mouth engaging wall 6 is formed between the male screw part of the mouth part 4 of the tube container 1 and the nozzle part 5 formed above the mouth part 4. A cap engaging projection 13a is formed on the inner peripheral surface of the cap 7 so as to be thickly sealed in the direction. The mouth engaging wall 6 and the cap engaging protrusion 13a are both formed in the entire circumferential direction, and the mouth engaging wall 6 and the cap engaging protrusion 13a abut against each other by line contact, so that the sealing can be performed more reliably. it can.

    FIG. 6 is a drawing showing Example 3 of the present invention. A mouth engaging projection 6a is formed between the male thread portion of the mouth portion 4 of the tube container 1 and the nozzle portion 5 formed above the mouth portion 4, and is axially directed to the mouth engaging projection 6a. The cap engaging wall 13 is formed on the inner peripheral surface of the cap 7 so as to be thickly sealed. Both the mouth engaging protrusion 6a and the cap engaging wall 13 are formed in the entire circumferential direction, and the mouth engaging protrusion 6a and the cap engaging wall 13 abut against each other by line contact, so that the sealing can be performed more reliably. it can. Therefore, since the outer periphery of the mouth portion 4 and the inner peripheral surface of the cap 7 can be reliably sealed by the surface contact or the line contact from the first embodiment to the third embodiment, an accuracy error or the like at the time of molding the mold, etc. Due to the dimensional error between the nozzle portion 5 and the top surface portion 10 of the cap 7, a gap (dimension S in FIG. 4) is generated between the opening of the tip portion 5 a of the nozzle portion 5 and the bottom surface of the top surface portion 10 of the cap 7. Even when the seal is defective, the portion indicated by the arrow A in FIG. 1 is used as the main seal point, so that leakage of moisture, aroma and the like of the contents to the outside can be reliably prevented. In addition, when the portion indicated by the arrow B in FIG. 1 has an original sealing function, the portion indicated by the arrow A in FIG. 1 serves as the main seal point and the point indicated by the arrow B in FIG. Due to the effect, a more reliable sealing effect can be achieved.

  FIG. 9 is a drawing showing Example 4 of the present invention. The nozzle portion 15 is an embodiment having a circular cross section and an eccentric center. Also in this case, since it is impossible to form a contact ring on the lower surface of the top surface of the cap, the leakage of contents such as moisture and aroma to the outside is reliably stopped at the portion indicated by arrow A in FIG. And the entry of outside air can be prevented as much as possible.

  FIG. 10 is a drawing showing Example 5 of the present invention. The nozzle part 25 has an elliptical cross section. Also in this case, since it is impossible to form a contact ring on the lower surface of the top surface of the cap, the leakage of contents such as moisture and aroma to the outside is reliably stopped at the portion indicated by arrow A in FIG. And the entry of outside air can be prevented as much as possible.

  FIG. 11 is a drawing showing Example 6 of the present invention. The nozzle part 35 has a rectangular cross section. Also in this case, since it is impossible to form a contact ring on the lower surface of the top surface of the cap, the leakage of contents such as moisture and aroma to the outside is reliably stopped at the portion indicated by arrow A in FIG. And the entry of outside air can be prevented as much as possible.

  FIG. 12 is a drawing showing Example 7 of the present invention. The nozzle section 45 has a trapezoidal cross section. Also in this case, since it is impossible to form a contact ring on the lower surface of the top surface of the cap, the leakage of contents such as moisture and aroma to the outside is reliably stopped at the portion indicated by arrow A in FIG. And the entry of outside air can be prevented as much as possible.

According to the present invention, since the sealing function between the cap and the mouth portion of the tube container can be reliably ensured, not only can air be prevented before opening, but also the contents such as moisture and aroma after opening. Since the components can be retained, the quality deterioration of the contents can be minimized. Therefore, the tube container according to the present invention is widely suitable for filling medicines, foods, and the like, and can be used in various ways.
Moreover, it can also apply to a bottle container other than a tube container.

1 is a front sectional view showing Example 1 according to the present invention. The expanded sectional view of the A arrow part of Drawing 1 showing Example 1 concerning the present invention. The DD line end view of FIG. 2 which is Example 1 which concerns on this invention. The expanded sectional view of the B arrow part of Drawing 1 showing Example 1 concerning the present invention. The expanded sectional view of A arrow part which shows Example 2 which concerns on this invention. The expanded sectional view of the A arrow part which shows Example 3 which concerns on this invention. The expanded sectional view of the C arrow part of Drawing 1 showing Example 1 concerning the present invention. The top view of FIG. 7 which is C arrow part which concerns on Example 1 which concerns on this invention. The top view which shows Example 4 which concerns on this invention. The top view which shows Example 5 which concerns on this invention. The top view which shows Example 6 which concerns on this invention. The top view which shows Example 7 which concerns on this invention. Front sectional drawing which shows the sealing structure of the opening part of the conventional tube container, and a cap. The top view of the opening part of the conventional tube container.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tube container 3 Shoulder part 4 Mouth part 5 15 25 35 45 Nozzle part 5a Nozzle tip part 6 Mouth part engagement wall 6a Mouth part engagement protrusion 7 Cap 10 Top surface part 11 Anti-rotation part 13 Cap engagement wall 13a Cap engagement Joint

Claims (4)

A tube container and a cap screwed into the mouth portion of the tube container, and a mouth engaging wall or mouth portion between the male screw of the mouth portion and a nozzle portion formed above the mouth portion A cap engagement wall or a cap engagement protrusion is formed on the inner peripheral surface of the cap, and the cap engagement wall or the cap engagement protrusion is formed in an axial direction with respect to the mouth engagement wall or the mouth engagement protrusion and sealed. A sealing structure between a mouth portion of a tube container and a cap, characterized by being formed. 2. The sealing structure between the mouth portion of the tube container and the cap according to claim 1, wherein a stopper portion of the cap is formed on the shoulder portion of the tube container so that the engaging projection of the cap rides on and is locked. The contact between the mouth engaging wall or the mouth engaging protrusion of the tube container and the cap engaging wall or the cap engaging protrusion is used as a main seal point, and the bottom surface of the top surface of the cap and the tip of the nozzle The sealing structure between the mouth portion of the tube container and the cap according to claim 1, wherein the contact point is a secondary seal point. 4. A sealing structure between a mouth portion of a tube container and a cap according to claim 1, wherein the tube container is replaced with a bottle container.

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