JP5004272B2 - Easy opening container with cap - Google Patents

Description

  The present invention is a so-called twist-off in which a container main body having an opening and a sealing body that seals the opening of the container main body are integrally formed via a weakly breakable portion formed at the boundary between the two. With regard to a container that is easy to break open called a container, in particular, when removing the cap attached to the container body, along with the removal of the cap, the weakened part can be broken and the sealed body can be separated from the container body, The present invention relates to a resin container having a cap and easy to open at break.

A container body that has an opening and a sealing body that seals the opening of the container body are integrally formed via an easily breakable weakened portion that is formed at the boundary between the two. Conventionally known is a resin container called a twist-off container, in which the weakened part is broken by twisting and breaking, and the opening of the container body is opened by breaking the sealing body from the container body. Yes. In such a container with easy break opening, when the cap attached to the container body is removed, the weakened part (thin break part) is broken by moving the sealing body (cover plate) with the cap. A device that can separate a sealed body (cover plate) from a main body (container body) is conventionally known from Patent Document 1 below.
Utility Model Registration No. 2605789

  By the way, in a container with a conventionally known cap that is easy to break open as described above, the vertical projections are provided on the cap side and the sealing body (lid plate) side, respectively, so that when the cap is removed, By engaging, the sealing body (lid plate) is rotated with the rotation of the cap, whereby the weakened portion (thin wall breaking portion) is broken, and the cap side and the sealing body (lid plate) When the cap is attached to the container, the weakened portion (thin rupture portion) is not accidentally broken when the cap is attached to the container.

  However, even if a sufficient gap is provided between the vertical projections on the cap side and the sealing body (lid plate) side, there is an unexpected rotational force on the cap during display or transportation of the container. If applied, the moment of inertia is generated by the distance of the slipping, so that the vertical projections collide strongly, and the weakened portion (thin rupture portion) may be accidentally broken by the impact of the collision.

  Moreover, in the container with a conventionally known cap as described above, which is easy to break open, since the cap and the sealing body (lid plate) are engaged by the respective vertical projections, the container body ( The sealing body (cover plate) separated from the container body is not held by the cap, but is dispersed from the container and the cap, resulting in a problem that the garbage becomes small dust that is difficult to collect.

  An object of the present invention is to solve the above-described problems. Specifically, for a container that has a cap with an opening function and is easy to open, the weakened portion is weakened as much as possible to facilitate opening. However, it is an object to prevent the weakened portion from being accidentally broken before opening, and to prevent the generation of small dust dispersed from the container or cap after opening. .

In order to solve the above-described problems, the present invention provides a container body having an opening and a sealing body that seals the opening of the container body via a weakly fragile portion that is formed at the boundary between the two. The cap that covers the sealing body and weakened part is attached to the container body that can be easily detached from the container body by moving in the container axis direction. The container body has a non-circular cross-sectional shape at the engaging portion so that the two cannot be relatively rotated with the cap attached to the container body, and the container sealing body is The plate portion has a plate-like portion, and the holding portion for holding the plate surface of the plate-like portion from both sides is formed on the inside of the cap. sandwiching portion sandwiching the plate-shaped portion of the blockade of the container, and the container body and the key Tsu even when solved the engagement with the flop, it is characterized in that the clamping portion of the cap is configured to continue to sandwich the plate-like portion of the sealed body of the container.

According to the container having the cap of the present invention that is easy to break open as described above, in the cap and the container body that can be engaged and disengaged by movement in the container axial direction, the cross-sectional shape of both is not Since it is circular, when the cap is attached to the container body, the plate-like part of the sealing body above the container body and the clamping part inside the cap can be positioned reliably, and the cap The sealed body of the container can be securely and easily held with respect to the holding portion.

  In addition, in the state where the cap is attached to the container body, the cross-sectional shape of both of them is non-circular at the engagement point between them, and the container body and the cap are relatively unrotatable. The cap will not be rotated accidentally during transport or during transport, and the sealing body held by the holding part of the cap will not be moved accidentally, so weaken the weakened part of the container as much as possible. Even if it is easy to open the container, it will not be opened by mistake unless the engagement between the container body and the cap is released.

In addition, even when the container body and the cap are disengaged and the cap is slightly lifted, the cap holding part continues to hold the container seal, so that the cap is not only tilted from that state. Also by rotating , the sealing body sandwiched between the caps is moved, the weakened portion is broken, and the container is easily opened. And even after the container has been opened in such a manner, the sealed body separated from the container remains sandwiched by the sandwiching part of the cap, so that it can be collected together with the cap without being dispersed as small garbage. .

Even if the weakened part is weakened as much as possible to make it easy to open the container with a cap having an opening function, the weakened part will not be broken by mistake before opening, and after opening, The container body having an opening and the opening of the container body, as specifically shown in the following embodiments as the best mode, in order to prevent the generation of small dust dispersed from the container and the cap The sealing body that seals the portion covers the sealing body and the weakened portion with respect to the resin-made container that is easy to break open and is integrally formed through the weakly breakable portion formed at the boundary between the two. Such a cap is detachably attached to the container body by moving in the container axial direction, and the engagement between the two is such that the two cannot be relatively rotated when the cap is attached to the container body. Non-circular cross-sectional shape of both at the joint While in the blockade of the container, and having a plate-shaped portion, the clamping portion for clamping the plate surface of the plate-like portion from both sides, formed on the inside of the cap, crown cap to the container body Even when the cap sandwiching portion sandwiches the plate-shaped portion of the container sealing body and the container main body and the cap are disengaged, the cap sandwiching portion is the plate of the container sealing body . This is realized by constructing it so as to continue to hold the shape part .

In the container having the cap of the present invention that is easy to break open, the portion of the container excluding the cap (the container in which the container main body, the sealing body, and the weakened part are integrally formed) is suitably made of olefin resin or polyester resin The cap part is made of an olefin resin by an appropriate molding method known in the art, such as an injection molding method, a compressed air (vacuum) molding method, and a blow molding method. And an appropriate resin such as polyester resin as a raw material, and integrally molded by an appropriate molding method conventionally known, such as an injection molding method.
One example of a container having such a cap of the present invention and having an easy break opening will be described below.

  A container having a cap according to the present embodiment, which is easy to break open, and a portion of the container excluding the cap is integrally molded by a direct blow molding method using a polyester resin as a raw material, and is a cylindrical parison extruded from an extruder. Is sandwiched between two molds and blown with compressed air to form a cylindrical body at the bottom of the parison, and after filling the contents of the body, into another two-part mold. By forming the upper part of the parison with sandwiching, the container main body for storing the contents and the sealing body for sealing the container main body are integrally formed, and the boundary between the container main body and the sealing body is easily broken. A weakened part is formed.

  In addition, about the polyester resin used as the raw material of a container with easy opening at break, specifically, in this example, the acid component is terephthalic acid, and 1,4-cyclohexane is used as the glycol component with respect to 96 mol% of ethylene glycol. A polyester resin added with 4 mol% of dimethanol or bisphenol A is used.

  Such a polyester resin has an intrinsic viscosity of about 1.0 dl / g, does not draw down when molded by a direct blow molding method, has a melting point of about 235 to 245 ° C. Since the melting point is 10-30 ° C. lower than that of the polyester resin and molding can be performed at a low temperature, rapid cooling is possible, and furthermore, the crystallization rate is slow, and the moldability is good.

  As shown in FIGS. 1 and 2, the container body 2 is integrally formed from the elliptical bottom 21 with respect to the structure of the container of the present embodiment that is integrally molded from such a polyester resin and that is easy to break open. A body 22 having an elliptical cross-sectional shape is formed at the upper end, and a locking groove 23 serving as an engaging part with the cap is formed in an annular shape at the upper end of the body 22 around the entire circumference. A shoulder portion 24 is formed above the concave groove portion 23 so as to have a gentle upward slope toward the inside, and a substantially cylindrical neck portion 25 is formed so as to protrude upward from the center of the shoulder portion 24. A frustoconical mouth portion 26 is formed upward from the upper end of the neck portion 25, and the weakened portion 4, which is easily broken, is seen from above at the upper end of the mouth portion 26 as a boundary with the sealing body 3. It is formed in a circle.

  In the sealing body 3, a hollow bell-shaped portion 31 for sealing the mouth portion 26 of the container body 2 and a plate-like portion 32 that becomes a portion interlocked with the cap 5 when the container is opened are a plate-like portion 32. Is formed integrally so as to straddle the bell-shaped part 31. And the lower end of the bell-shaped part 31 is located below the lower end of the plate-shaped part 32, and is connected integrally with the mouth part 26 of the container main body 2 via the weakening part 4.

  Further, in the plate-like portion 32 of the sealing body 3, the concave portions 32 a sandwiched by the sandwiching portions 54 of the cap 5 are formed on the front and back surfaces thereof so as to have respective lengths in the horizontal direction and the vertical direction. At the upper end of the recess 32a, a retaining protrusion 32b for preventing the holding portion 54 of the cap 5 from coming off when the cap 5 is pulled up has a length in the horizontal direction. Is formed.

  Explaining a specific manufacturing method of the container of the present embodiment having the above structure, after extruding the polyester resin from the extruder into a cylindrical parison having a diameter of about 25 mm and a thickness of about 0.8 mm, The parison is sandwiched between two molds and directly blow-molded. First, the lower part of the parison has a circular bottom 21, a barrel 22 having a diameter inflated with the parison, and an upper lock of the barrel 22. The concave groove portion 23 and the shoulder portion 24 extending inwardly from the upper side of the locking concave groove portion 23 are formed.

  Next, the semi-molded parison thus molded from the bottom portion 21 to the shoulder portion 24 is filled with the contents from the filling pipe into the body portion 22, and then the upper portion of the parison is divided into another half of the gold. The neck portion 25 and the mouth portion 26 are formed by sandwiching them with a mold, and the bell-shaped portion 31 and the flat plate portion 32 of the sealed body 3 are formed, and the container containing the contents is sealed.

  In this example, in order to omit the sterilization process of the container, the process from the parison extrusion process to the final sealing process is performed in an aseptic atmosphere. Further, in this embodiment, immediately after forming the sealing body 3 by sandwiching it between the two molds, the tip of the mold is bitten toward the container body 2 so that the upper end of the mouth portion 26 of the container body 2 is locally The weakened portion 4 having a reduced plate thickness is formed at the upper end of the mouth portion 26 by stretching it.

  The weakened portion 4 formed between the container main body 2 and the sealed body 3 is a part of which is partially thinned. The molding method is as follows. Appropriate methods such as a method of thinning by laser irradiation or a method of thinning by cutting with a blade can be applied.

  On the other hand, the cap 5 that is attached to the container body 2 of the container as described above is integrally formed by an injection molding method in which a polyester resin that is not easily elastically deformed is injected into the gap between the molds. The cross-sectional shape of the skirt portion 52 hanging from the top plate portion 51 of the cap 5 is substantially the same as the elliptical shape of the cross-sectional shape of the trunk portion 22 of the container body 2, and the cap 5 is attached to the container body 2. In this state, the body 22 of the container body 2 and the skirt 52 of the cap 5 are formed so as to exhibit the same outer surface.

  Further, a plurality of discontinuous protrusions 53 projecting inward so as to engage with the engaging recess groove 23 of the container body 2 are discontinuous in the lower end inside the skirt portion 52 of the cap 5. A pair of sandwiching portions 54 are suspended inside the top plate portion 51 of the cap 5 so as to sandwich the plate-like portion 32 of the sealing body 3 from both sides of the plate surface. Thus, at the lower end of each clamping part 54, a clamping ridge 54a protruding inward is formed with a horizontal length so as to enter the recess 32a of the plate-like part 32 of the sealing body 3. Yes.

  In such a cap 5, as shown in FIG. 2, the engaging projection 53 of the cap 5 is engaged with the engaging recess groove 23 of the container body 2 and the cap 5 is attached to the container body 2. In addition, the pinching protrusion 54 a of the pinching portion 54 of the cap 5 holds the lower portion of the concave portion 32 a of the plate-like portion 32 of the sealing body 3. In addition, since the concave portion 32a has a predetermined length in the vertical direction, even if the cap 5 is slightly lifted by releasing the engagement between the locking convex portion 53 of the cap 5 and the locking concave groove portion 23 of the container body 2, As shown in FIG. 3, the pinching protrusion 54 a of the pinching portion 54 of the cap 5 moves upward in the recess 32 a of the plate-like portion 32 of the sealing body 3 and is locked by the retaining protrusion 32 b. However, the clamping part 54 of the cap 5 is still in the state of holding the sealing body 3.

  Then, as shown in FIG. 3, the cap 5 is rotated from a state where the cap 5 is slightly lifted by releasing the engagement between the lock convex portion 53 of the cap 5 and the lock concave groove 23 of the container body 2. Or by tilting, the sealing body 3 held in the holding part 54 of the cap 5 is moved, and the weakened part 4 of the container is broken by the movement of the sealing body 3. Even after the weakened portion 4 is broken and the container is opened, as shown in FIG. 4, the sealed body 3 separated from the container main body 2 remains held by the holding portion 54 of the cap 5, and the cap 5 There is no such thing as separation.

According to the container having the cap of the present embodiment as described above and having an easy break opening, in the container body 2 and the cap 5 that are removably crowned by the locking concave groove portion 23 and the locking convex portion 53, Since the cross-sectional shape of both of them is an ellipse at the engagement point between the two, when the cap 5 is attached to the container body 2, the direction of the holding portion 54 inside the cap 5 is clearly determined. And the plate-like portion 32 of the sealing body 3 above the container body 2 and the holding portion 54 inside the cap 5 can be reliably aligned, and the holding portion 54 of the cap 5 The sealing body 3 can be clamped reliably and easily.

  Further, in a state where the cap 5 is attached to the container main body 2, the container main body 2 and the cap 5 are relatively unrotatable, and the cap 5 is erroneously rotated during display or transportation. Therefore, the sealing body 3 held by the holding part 54 of the cap 5 is not moved accidentally, and even if the weakened part 4 of the container is weakened as much as possible to make it easy to open the container body As long as the engagement between the cap 2 and the cap 5 is not released, it will not be opened by mistake.

Further, when the engagement between the container body 2 and the cap 5 is released and the cap 5 is lifted up a little, the pinching protrusions 54 a of the pinching portion 54 of the cap 5 are locked by the locking protrusions 32 b of the sealing body 3. In this state, the lifting of the cap 5 is stopped, but in that state, the holding portion 54 of the cap 5 continues to hold the sealing body 3 and not only tilts the cap 5 from that state , Also by rotating, the sealing body 3 clamped by the cap 5 is moved, the weakening part 4 is broken, and the container is easily opened. Then, after the container is opened in such a manner, the sealed body 3 separated from the container main body 2 remains sandwiched by the sandwiching portion 54 of the cap 5, so that it does not disperse as a small garbage and can be used together with the cap 5. It can be recovered.

  As mentioned above, although one Example of the container with the cap of this invention with easy opening of breakage was demonstrated, this invention is not limited only to the above Examples, For example, about the raw material of a container and a cap Is not limited to the polyester resin as shown in the examples, but may use an olefin resin or a combination of an olefin resin and a polyester resin. It is not limited to the elliptical shape shown in the example, but may be a non-circular shape such as a triangle, a quadrangle, a pentagon, etc., and an engagement for detachably attaching a cap to the container body. The means is not limited to the engaging groove and the engaging protrusion as shown in the embodiment, and may be other appropriate engaging means. Further, the sealing body and the cap that holds the sealing body may be used. For even lifting unit is not limited to the specific structure as shown in the Examples, may be other suitable structures or the like, it is needless to say be capable design changes as appropriate.

The front view which shows the part of a cap by a cross section about the state before opening of the container with easy opening of the fracture | rupture opening with which the cap was attached in one Example of this invention. The side view which shows the part of a cap in a cross section about the container in which the cap shown in FIG. 1 was crowned. The side view which shows the part of a cap in a cross section about the state which released the engagement with the container main body and the cap from the container with which the cap shown in FIG. The side view which shows the part of a cap in a cross section about the state after moving a cap from the container which lifted the cap shown in FIG. 3 for a while, and opening a container.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container where break opening is easy 2 Container main body 3 Sealed body 4 Weakened part 5 Cap 23 (Container main body) Locking concave groove part 26 Mouth part (opening part of container main body)
32 Plate-like part 53 (of the sealing body) 53 Locking convex part 54 (of the cap) Clamping part (of the cap)

Claims (1)

A container body having an opening and a sealing body that seals the opening of the container body are integrally formed through an easily breakable weakened portion formed at the boundary between them, A cap that covers the sealing body and the weakened part is attached to the container so as to be detachable from the container main body by movement in the container axial direction, and both the caps are attached to the container main body. The both cross-sectional shapes are non-circular at the engaging locations so that they cannot be rotated relatively, and the container sealing body has a plate-like portion. The holding part for holding the plate surface from both sides is formed inside the cap, and the holding part of the cap holds the plate-like part of the container sealing body in a state where the cap is attached to the container body. Even when the container body is disengaged from the cap, Breaking open easily vessel equipped with a cap, characterized in that the section is configured to continue to sandwich the plate-like portion of the sealed body of the container.

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