JP4974233B2 - 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. Regarding a container that is easy to break open called a container, in particular, the material of the container excluding at least the cap is made of polyester resin. In addition, the present invention relates to a resin container that is easy to break open so that the opening of the container main body after the sealing body is removed can be reliably resealed with a cap after opening.

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 addition, in such a container that can be easily opened by breakage, the applicant also means that a stopper for resealing the opening of the opened container body is formed integrally with the part of the sealing body. Conventionally known from the following Patent Document 1 relating to the application.
Utility Model Registration No. 2554924

  By the way, in the conventionally well-known container with easy break opening as described above, the entire container is generally formed of an olefin resin in order to easily break off the sealing body from the container body (the weakened part is easily broken). However, in recent years, it has better resistance to contents than olefin resin, and it is easy to break opening made of polyester resin that is inert to the contents and has no resin odor (the odor of the resin does not transfer to the contents). New containers are desired.

  However, although the polyester resin has better content resistance than the olefin resin, it is more viscous than the olefin resin, and when used in a container that is easy to break open as described above, the sealed body is removed from the container body. At the time of folding, the weakened portion is hardly broken, and a phenomenon may be caused in which the yarn is pulled at the broken portion of the weakened portion where the blocking body is folded.

  Therefore, in order to overcome the drawbacks of such a container made of polyester resin that is easy to break open, the weakened part is made thinner by appropriate means or the material near the weakened part is brittlely modified. If the weakened portion is made too easy to break, the weakened portion may be easily broken and the container may be opened accidentally when the sealed body is inadvertently moved during display or transportation of the container. .

  An object of the present invention is to solve the above-described problems. Specifically, for a container that is easily opened by breakage made of a polyester resin, even if the weakened portion is weakened as much as possible to facilitate opening, It is an object of the present invention to ensure that the weakened portion is not accidentally broken before, and that the opening of the container body after opening can be reliably resealed.

  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 container and the weakened portion are formed on a container made of polyester resin and formed with a screwing means (or engaging means) for attaching the cap to the container body. A cap that covers in a non-contact state is removably attached to the container body so as to be screwed (or engaged) with the screwing means (or engaging means) of the container body in a state of covering them. In addition, the cylindrical skirt portion extending downward from the top plate portion of the cap has a screwing means for screwing (or engaging) with the container body in a state where the sealing body and the weakening portion are covered near the lower end portion thereof. (Or engaging means) is formed, and the skirt part is A breakable split part is formed for splitting, and a re-sealing part that is screwed (or engaged) with the container body in a state of sealing the opening of the container body after the sealing body is removed. A screwing means (or engaging means) is formed.

  According to the container with the cap of the present invention that is easy to break open as described above, even if the weakened portion of the container made of polyester resin is weakened as much as possible to make the container easy to open, before opening the container The cap and the weakened part are covered and protected by the cap, so that the cap is not accidentally moved and the weakened part is broken, and the container is opened accidentally. Can be surely prevented.

  In addition, after breaking the weakened part and removing the sealing body and opening the container, the cap is broken at the dividing part and divided into upper and lower parts, and the upper part is covered as a cap on the container body, and the part is covered. A cap (upper part of the original cap) is formed by screwing (or engaging) the formed resealing screwing means (or engaging means) with the screwing means (or engaging means) of the container body. By sealing the container to the container body and resealing the opening, even if pressure is applied to the body of the container body, the opening can be reliably sealed by the cap and the container can be securely Can be resealed.

  Even if the weakened part is weakened as much as possible to make it easy to open the container made of polyester resin, the weakened part will not be broken by mistake before opening, and the opening of the container body after opening The container body having an opening and the sealing body for sealing the opening of the container body, as specifically shown in the following examples as the best mode, to ensure re-sealing of the container, A rupture made of polyester resin, which is integrally formed through a weakly weakened portion formed at the boundary between the two and formed with a screwing means (or engaging means) for attaching a cap on the container body. A cap that covers the sealing body and the weakened portion in a non-contact state with a container that can be easily opened is screwed (or engaged) with the screwing means (or engaging means) of the container body in a state of covering the cap. Wear on the container body The cylindrical skirt portion that can be freely attached and extends downward from the top plate portion of the cap is screwed (or engaged) with the container body in a state where the sealing body and the weakened portion are covered near the lower end portion thereof. The container main body after forming the screwing means (or engaging means) to be cut and forming the breakable dividing portion for dividing the skirt portion up and down above the sealing body is removed. This is realized by forming a re-sealing screwing means (or engaging means) that is screwed (or engaged) with the container body in a state in which the opening of the container is sealed.

In the container with 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 molded) is made of polyester resin as an injection molding. The cap portion is formed by an appropriate molding method known in the art such as a pressure method, a pressure (vacuum) molding method, and a blow molding method, while the cap portion is made of an appropriate resin such as an olefin resin or a polyester resin. The material is 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 formed upward from the circular bottom 21 with respect to the structure of the container of the present embodiment that is integrally molded from such a polyester resin. A cylindrical body 22 bulging outward is formed by blow molding, and is smaller in diameter than the body 22 through the smooth curved shoulder 23 from the upper end of the body 22 and approximately the same diameter as the parison. A neck portion 24 is formed, a male screw portion 25 is formed on the outer surface of the neck portion 24, an annular top plate portion 26 is formed inward from the upper end of the neck portion 24, and protrudes upward from the center of the top plate portion 26. Thus, a truncated cone-shaped mouth portion 27 is formed, and at the upper end of the mouth portion 27, a weakened portion 4 that is easily broken is formed in a circular shape as a boundary with the sealing body 3 when viewed from above.

  In the sealing body 3, a hollow bell-shaped portion 31 for sealing the mouth portion 27 of the container main body 2, a flat plate portion 32 that serves as a knob when the container is opened, and the flat plate portion 32 replaces the bell-shaped portion 31. It is integrally formed so as to straddle. And the lower end of the bell-shaped part 31 is located below the lower end of the flat plate part 32, and is integrally connected with the mouth part 27 of the container main body 2 via the weakening part 4.

  In the container having the container body 2 and the sealing body 3 that are integrally connected via the weakening portion 4 as described above, in the container that can be easily opened by breakage, the flat plate portion 32 of the sealing body 3 is pinched with a fingertip and twisted. When the weakened portion 4 is broken and the sealing body 3 separated from the container main body 2 is removed, the mouth portion 27 of the container main body 2 closed by the bell-shaped portion 31 of the sealing body 3 is opened. .

  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, By direct blow molding with this parison sandwiched between two dies, first, the lower part of the parison is reduced in diameter upward from the circular bottom 21, the barrel 22 having a diameter inflated with the parison, and the barrel 22. A curved shoulder portion 23 and a neck portion 24 having a male screw portion 25 protruding from the surface are formed.

  Next, for the parison of the semi-molded body thus molded from the bottom 21 to the neck 24, after filling the contents of the barrel 22 from the filling pipe, the top of the parison is divided into another two-part gold. The top plate part 26 and the mouth part 27 of the container body 2 are formed by sandwiching and molding between the molds, and the bell-shaped part 31 and the flat plate part 32 of the sealing body 3 are formed to seal the container containing the contents. To do.

  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 27 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 27 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 molded by an injection molding method in which an olefin resin is injected into the gap between the molds in the present embodiment, as shown in FIG. Thus, in the cylindrical skirt portion 52 that extends downward from the top plate portion 51 of the cap 5, a female screw portion 53 that is screwed with the male screw portion 25 of the container body 2 is formed on the inner surface near the lower end portion thereof. A breakable splitting portion 54 for splitting the skirt portion 52 up and down is formed above it, and a female for resealing that is screwed with the male screw portion 25 of the container body 2 on the inner surface side above the skirt portion 52. A screw portion 55 is formed. In addition, an annular rib 56 for sealing is integrally formed on the lower surface side of the top plate portion 51 of the cap 5, and the annular rib 56 allows the container body 2 after opening to be opened as shown in FIG. The vicinity of the upper end of the mouth part 27 is covered from the outside and sealed.

  As for the female thread portion 53 formed near the lower end portion of the skirt portion 52 of the cap 5, as shown in FIG. 1 or 2, the container body 2 with the cap 5 covering the sealing body 3 and the weakened portion 4. In the unopened container, the female screw part 53 is screwed into the male screw part 25 of the container body 2 so that the top plate part 51 and the skirt part 52 are screwed together. The cap 5 is attached to the container body 2 so that the sealing body 3 and the weakened portion 4 are completely covered in a non-contact state in the space inside the cap 5 surrounded by.

  The breakable split portion 54 formed in the skirt portion 52 of the cap 5 is composed of a plurality of thin bridge portions and slit portions, and is slightly higher than the center portion in the vertical direction (axial direction) of the skirt portion 52. It is formed along the circumferential direction of the skirt portion 52 at a position close to the top plate portion 51 side, and the thin bridge portion can be easily broken by twisting the cylindrical skirt portion 52 by hand. Thereby, the skirt part 52 can be divided | segmented up and down on the division part 54 as a boundary.

  As shown in FIG. 4, the upper portion of the cap 5 that is divided vertically by the dividing portion 54 is used for the resealing female screw portion 55 that is formed above the dividing portion 54 by the skirt portion 52 of the cap 5. The container body 2 after opening (after the sealing body 3 is removed) is covered with the opening of the container body 2, and is screwed with the male screw portion 25 of the container body 2. Then, in the opened container, the female screw part 55 is screwed into the male screw part 25 of the container main body 2 so that the opening of the container main body 2 is resealed by the cap 5 with respect to the container main body 2. As a result, the cap 5 is crowned.

  That is, in this embodiment, the sealing annular rib 56 is integrally formed on the lower surface side of the top plate portion 51 of the cap 5, and when the opening of the container body 2 is resealed, The top screw 51 of the cap 5 is attached to the container main body 2 by screwing the female screw 55 and the male screw 25 of the container main body 2 together. An annular rib 56 formed on the lower surface side covers the vicinity of the upper end of the mouth portion 27 of the container body 2 from the outside.

  According to the container having the cap 5 as described above and having an easy break opening, the cap 5 is attached to the container body 2 by screwing with the female screw portion 53 formed near the lower end portion of the skirt portion 52 of the cap 5. By wearing the container, the sealed body 3 will not be moved by mistake as long as the cap 5 is not removed no matter how the container is handled during exhibition or transport in the container before opening. Even if the weakened portion 4 is weakened as much as possible in order to make it easy to open the container made of polyester resin, the sealed body 3 is not moved carelessly and the weakened portion 4 is not broken, and the container is mistaken. There is no fear of being opened.

  In addition, after the weakened portion 4 is broken and the sealing body 3 is removed and the container is opened, the cap 5 is divided into upper and lower portions by breaking the dividing portion 54, and the upper portion thereof is used as the cap 5. The cap 5 is crowned on the container main body 2 by screwing with the formed re-sealing female screw portion 55, so that the annular rib 56 formed on the lower surface side of the top plate portion 51 of the cap 5 The opening of the container body 2 can be resealed by the cap 5 in a state in which the vicinity of the upper end of the mouth portion 27 is covered from the outside.

  Then, the container is resealed by attaching the cap 5 (portion above the dividing portion 54) to the container main body 2 by screwing at the female screw portion 55, so that the body of the container main body 2 is sealed. Even if pressure is applied to the portion 22, the closed state of the mouth portion 27 (upper end opening portion of the mouth portion) of the container body 2 by the annular rib 56 of the cap 5 can be reliably maintained, and the container can be reliably re-inserted. Can be blocked.

  As mentioned above, although one Example of a container with a cap of the present invention that can be easily opened by breakage has been described, the present invention is not limited only to the above-described example, and for example, a container via a weakening part. The sealing body that seals the opening of the main body is not limited to the specific shape including the hollow bell-shaped portion shown in the embodiment, and the other includes a hollow spherical portion (spherical shell portion). In addition, the resealable sealing portion provided in the cap is not limited to the annular rib formed integrally with the cap as shown in the embodiment, and is separate from the cap. It may be a liner member, and the structure thereof is not limited to a structure that covers the mouth part from the outside, but may be a structure that is inserted inside the mouth part (opening part). To attach the main body and cap detachably The means is not limited to the screwing means by the male screw part and the female screw part as shown in the embodiment, but may be an engaging means by a protrusion and a protrusion or an engaging means by a protrusion and a depression, etc. Needless to say, the design can be changed.

In the Example of this invention, the partial cross section front view which shows the part of a cap in a cross section about the state where the cap was attached to the unopened container. The partial cross section side view which shows the part of a cap in a cross section about the Example shown in FIG. The longitudinal cross-sectional view which shows only the part of the cap of the Example shown in FIG. The partial cross section front view which shows the part of a cap in a cross section about the state resealed by the cap after the container was opened in the Example shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container with easy break opening 2 Container body 3 Sealed body 4 Weakened part 5 Cap 25 Male screw part (screwing means of container body)
27 mouth (opening of container body)
53 Female thread (cap screwing means)
54 Dividing part 55 Female thread part (screwing means for re-sealing 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 via a weakened portion that is easily broken and formed at the boundary between the two. For a container made of polyester resin, in which a joining means or an engaging means is formed on the container body, and a cap that covers the sealing body and the weakened part in a non-contact state, covers the container A cylindrical skirt portion that is removably attached to the container main body so as to be screwed or engaged with the screwing means or the engaging means of the main body, and that extends downward from the top plate portion of the cap, In the vicinity of the lower end portion, a screwing means or an engaging means for screwing or engaging with the container main body in a state of covering the sealing body or the weakened portion is formed, and above it, breakable to divide the skirt portion vertically Split part is formed, and above that, A break having a cap, wherein a screwing means or an engaging means for resealing that is screwed or engaged with the container main body in a state of sealing the opening of the container main body after being removed is formed. Easy opening container.

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