JP2008137705A - Capped container easily opened by breaking - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container made of a polyester resin and easily opened by breaking, which container and facilitates unsealing of the container by weakening a weakened portion as much as possible but prevents the weakened portion from being mistakenly broken before unsealing the container. <P>SOLUTION: The container 1 made of a polyester resin and easily opened by breaking includes a container body 2 having an opening, a closure 3 closing the opening of the container body 2, the container body 2 and the closure 3 being formed integrally via the easily breakable weakened portion 4 formed on the boundary between the container body 2 and the closure 3. A screw means 25 is formed on the container body 2, and a cap 5 covering the closure 3 and weakened portion 4 without contact with them is fitted removably on the container body 2 so that the cap 5 is engaged with the screw means 25 of the container body 2 (via a screw means 52) while covering the closure 3 and weakened portion 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

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, a container having a container body, a sealing body, and a weakened part is made of a polyester resin, and even if the weakened part is weakened as much as possible to facilitate opening. The present invention relates to a resin-made container that is easy to break open so that the weakened portion is not broken by mistake before 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 part is too easy to break, the weakened part may be easily broken and the container may be opened accidentally when the sealing body is moved carelessly 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 to prevent the weakened part from being broken by mistake before.

  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 body is formed with a screwing means or an engaging means, and the sealing body and the weakened part are covered in a non-contact state with respect to the container formed of polyester resin and having an easy break opening. The cap is detachably attached to the container body so as to be screwed or engaged with the screwing means or the engaging means of the container body in a state of covering them.

  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.

  It should be noted that, in the container having the cap of the present invention that is easy to break open as described above, the opening of the container body after the sealing body is removed on the opposite side of the cap from the portion for covering the sealing body A plug body for resealing the portion, and a screwing means or engagement means for resealing which is screwed or engaged with the screwing means or the engagement means of the container body in a state where the opening is resealed by the plug body In such a case, after the container is opened, the container body is attached to the container body by the cap body in a state where the cap is attached to the container body by screwing means or engaging means for resealing the cap. By sealing the opening, even if pressure is applied to the body of the container main body, the opening can be reliably blocked by the stopper, and the container can be reliably sealed again.

  The best form of the container made of polyester resin is easy to break open, even if the weakened part is weakened as much as possible and easy to open, so that the weakened part is not broken by mistake before opening. As specifically shown in the following examples, the container main body having an opening and the sealing body for sealing the opening of the container main body are integrated with each other through an easily breakable weakening formed at the boundary between the two. For the container made of polyester resin that is easy to break open, a screwing means or 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 is provided. This is realized by detachably crowning the container main body so as to be screwed or engaged with the screwing means or engaging means of the container main body.

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, so that 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 portion 22 is formed, and a cylindrical neck portion 24 having a diameter smaller than that of the body portion 22 is formed from the upper end of the body portion 22 through a curved shoulder portion 23, and a single male thread is formed on the outer surface of the neck portion 24. A screw portion 25 is formed, a top plate portion 26 is formed inward from the upper end of the neck portion 24, and a truncated cone-shaped mouth portion 27 is formed so as to protrude upward from the center of the top plate portion 26, At the upper end of the mouth portion 27, a weakened portion 4 that is easily broken is formed in a circle 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 embodiment, in order to omit the container sterilization process, the process from the parison extrusion process to the final sealing process is performed in a sterile 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, in the present embodiment, the cap 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, as shown in FIG. In addition, in the cap 5, a single female screw portion 52 is formed in the vicinity of the lower end portion of the inner surface of the cylindrical tubular portion 51 serving as the skirt portion, and the central portion in the height direction of the tubular portion 51. Further, a top plate portion 53 is formed so as to partition the inside of the cylindrical portion 51 vertically. Further, a stopper 54 for resealing the opened container is formed on the top surface side of the top plate portion 53, and the opened container is placed near the upper end of the inner surface of the cylindrical portion 51. A single female thread portion 55 for re-sealing is formed.

  In such a cap 5, in the container before opening, as shown in FIG. 4, a top plate portion is obtained by screwing a female screw 52 near the lower end portion of the cap 5 with a male screw portion 25 of the container body 2. 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 by the space below the cap 5 partitioned by 53.

  Since the cap 5 is attached to the container body 2 in such a manner, in the container before opening, the sealing body 3 and the weakened portion 4 are completely covered and protected by the cap 5 in a non-contact state. No matter how the container is handled during exhibition or transportation, the sealed body 3 will not be moved by mistake as long as the cap 5 is not removed, and the container made of polyester resin can be easily opened. Even if the weakened portion 4 is weakened as much as possible, the sealing body 3 is not moved carelessly and the weakened portion 4 is not broken, and there is no possibility of the container being opened accidentally.

  In this embodiment, a cap 54 for resealing is formed on the top surface 53 of the top plate 53 with respect to the cap 5, and a resealing female is located near the upper end of the inner surface of the cylindrical portion 51. After the screw portion 55 is formed and the cap 5 is removed and the container is properly opened, the cap 5 is turned upside down and the female screw portion 25 of the cap 5 is connected to the male screw portion 25 of the container body 2 as shown in FIG. The screw part 55 (screw part for re-sealing) is screwed together, and the mouth part 27 of the container body 2 is covered with the plug 54 of the cap 5.

  In such a state, the cap 27 of the cap 5 is re-sealed by the cap 54 of the cap 5 in a state where the cap 5 is screwed to the container main body 2 by the female screw portion 55 (screw portion for resealing) of the cap 5. As a result, even if pressure is applied to the body portion of the container body 2, the sealed state of the mouth portion 27 (the upper end opening portion of the mouth portion) by the stopper 54 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). The plug for resealing is not limited to the structure covering the mouth (opening) as shown in the embodiment, and is inserted into the mouth (opening). Further, the means for detachably attaching the container main body and the cap is not limited to the screwing means using the male screw part and the female screw part as shown in the embodiment. Even if it is the engagement means by the protrusion and the protrusion, There like, it goes without saying be capable design changes as appropriate.

BRIEF DESCRIPTION OF THE DRAWINGS The front view which shows the state before opening of the container with easy opening of breakage | exclusion except the cap about one Example of this invention. The side view of the container shown in FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing only a cap that is attached to a container that can be easily opened by breaking, according to an embodiment of the present invention. The front view which shows the part of a cap in a cross section about the state by which the cap was attached to the unopened container in one Example of this invention. The front view which shows the part of a cap in a cross section about the state which was resealed after the container was opened in one Example of this invention, and the cap was attached to the container.

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)
52 Female thread (cap screwing means)
54 Plug body 55 Female thread part (screwing means for re-sealing the cap)

Claims (2)

  A container body having an opening and a sealing body that seals the opening of the container body are integrally formed through a weakly fragile portion that is formed at the boundary between the two, and an easy break opening made of a polyester resin The container body has screwing means or engaging means formed on the container body, and a cap that covers the sealing body and the weakened portion in a non-contact state covers the container body in a state of covering them. A container having a cap that can be easily opened by breakage, wherein the container is detachably attached to the container body so as to be screwed or engaged with the means or the engaging means.   The cap has a stopper for resealing the opening of the container body after the sealing body is removed on the side opposite to the portion for covering the sealing body, and the opening is resealed by the stopper. The cap according to claim 1, further comprising: a resealing screwing means or an engaging means for screwing or engaging with the screwing means or the engaging means of the container body. Easy break opening container.

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