JP2013154626A - Screw cap with sealing, and mold for molding the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a screw cap with sealing that allows determination that the cap is opened by an opening operation of the cap when opening the cap and that prevents the interval of a sealing ring slit from extending; and to provide a mold for molding the screw cap when drawing the cap away from a core when molding.SOLUTION: In a screw cap A with sealing and a mold for molding the screw cap A, the screw cap A is composed of a cap body A1 and a sealing ring A2; the sealing ring A2 includes a belt body 11 having a predetermined slit 10, and a breakable weakened portion 12; a cut-preventing portion is formed at both ends of the outer periphery of the belt body 11; the mold B includes a cavity and a core; a molding portion on which the cut-preventing portion of the sealing ring A2 is formed is disposed on the inner surface of the cavity; and the molding portion of the cavity and its vicinity are engaged with the cut-preventing portion of the sealing ring A2 and its vicinity for fixing both the ends of the belt body 11 of the sealing ring A2 when the screw cap A is formed.

Description

  The present invention relates to a screw cap, a molding die for the screw cap, particularly a screw cap with a seal provided with a sealing ring for preventing fraud, and a molding die for molding the screw cap with a seal.

  As a cap having a pilfer proof function, the cap body screwed to the outer periphery of the mouth tube portion of the container body is locked to the locking portion on the outer periphery of the mouth tube portion through a plurality of thin connection pieces so as not to be pulled out. The sealing ring is connected, and the connection piece is broken by the opening operation of the cap at the time of opening the lid, so that the sealing ring remaining at the bottom of the mouth tube part and the cap body to be opened are separated, thereby 2. Description of the Related Art Caps with a seal that prevent unauthorized opening so that it can be determined that the cap has been opened have been widely used.

  In addition, if the materials that make up the cap with the seal and the container body are different, it is necessary to remove the seal ring remaining in the mouthpiece and separate it from the viewpoint of recycling of waste. A slit is provided in the slit, and the end of the ring of the slit is connected by a severable connecting part. By opening the cap at the time of opening, the connecting part of the sealing ring is cut, and the sealing ring itself is put together with the cap body. BACKGROUND ART A cap with a seal that prevents unauthorized opening that can be removed from a mouth tube portion of a main body is conventionally known (see, for example, Patent Document 1).

JP 2004-1828 A

  When forming a cap with a seal, a cavity for forming the outer periphery of the screw cap, a lower cavity for forming the outer peripheral lower surface of the screw cap, and a core for forming the inner periphery of the screw cap are provided. The molten resin is poured into the formed mold, and then the resin is cooled to a constant temperature and solidified. First, after the cavity is extracted, the lower cavity is raised, the screw cap itself is extracted from the core, and the screw A cap is molded.

  However, in the cap with a seal described in the above-mentioned Patent Document 1, when removing from the core at the time of molding, the gap between the slits of the seal ring is increased by pushing out the seal ring outward and at the same time pulling downward. There is a problem that the connecting portion is cut and the connecting portion is cut, resulting in a defective product at the time of molding.

  An object of the present invention is to solve the above-mentioned problems, and it is possible to determine that the cap has been opened by opening the cap at the time of opening the lid. And a screw cap with a seal that prevents the gap between the slits of the sealing ring from being widened when removing the cap from the core at the time of molding, and prevents a defective product from being produced at the time of molding, An object is to provide a molding die for molding a screw cap.

  In order to solve the above-mentioned problems, the present invention provides a screw cap with a seal, and a screw cap with a seal made of a synthetic resin that is screwed to a mouth tube portion of a container body as a molding die for molding the screw cap. In the molding die for forming the screw cap, the screw cap includes a cap main body and a sealing ring continuously provided at the lower end of the cap main body. The sealing ring includes a band body provided with a predetermined slit, and a band body. Are formed in a ring shape by a breakable weakening portion that continuously connects the inside of the slit side surface between the end portions of the belt, and a cutting prevention portion is formed in the vicinity of both ends of the outer periphery of the belt body. The lower part is provided with a plurality of locking claw pieces that engage with the lower outer periphery of the mouth tube portion of the container body when the lid is closed, and the lower surface of the outer peripheral wall of the cap body and the upper surface of the sealing ring are formed by weakening pieces that can be broken. The mold is connected to the A cavity for forming the outer periphery of the cap and a core for forming the inner periphery of the screw cap are provided, and a forming portion for forming a cutting prevention portion for the sealing ring is disposed on the inner surface of the cavity. A configuration is adopted in which the molding portion and its vicinity engage with the sealing ring cutting prevention portion and its vicinity to fix the vicinity of both ends of the band of the sealing ring.

  As an example of the molding die, the cavity of the molding die is molded between the upper cavity for molding the outer periphery of the cap body, the lower end of the outer periphery of the cap body and the outer periphery of the sealing ring, and between the cap body and the sealing ring. It consists of a middle slide cavity that can be opened and closed to the left and right, and a lower cavity that forms the lower surface of the sealing ring, and the lower part of the middle slide cavity engages in the vicinity of the cutting prevention part of the part that forms the band of the sealing ring A concave portion is provided, and an engaging convex portion that engages with an engaging concave portion of the upper cavity and the middle slide cavity is disposed on the upper surface of the lower cavity, and the inner surface of the engaging convex portion is a band of the sealing ring. A configuration is adopted in which the vicinity of the cutting prevention portion is formed and a molding portion corresponding to the cutting prevention portion is provided.

  As an embodiment of the sealing ring and the molding die, the cutting prevention part of the band of the sealing ring is a concave part, and the molding part of the molding die is a convex part corresponding to the concave part of the cutting prevention part Alternatively, a configuration is adopted in which the cutting prevention part of the band of the sealing ring is a convex part, and the molding part of the molding die is a concave part corresponding to the convex part of the cutting prevention part.

  As an example of the cap body and the sealing ring, a plurality of locking recesses are provided at predetermined positions on the lower end of the outer peripheral wall of the cap body, and engage with the locking recesses at predetermined positions on the upper surface of the band of the sealing ring. Or a weakening piece that continuously connects the lower surface of the outer peripheral wall of the cap body and the upper surface of the band of the sealing ring. The structure characterized by the end part side on the opposite side to the direction being a connection weakening piece that is thicker and relatively stronger than the other weakening pieces is adopted.

  As an example of the sealing ring, the slit of the sealing ring is formed in the deformation slit, and the end of the band extends from the upper part of the end opposite to the opening direction across the deformation slit. And a lower band end extending from the lower part of the end in the opening direction, and both ends are connected to the inner side of the end opposite to the opening direction and the end of the lower band end. The structure characterized by forming the weakening part which can be provided and which can be fractured | ruptured is employ | adopted.

  The screw cap with a seal according to the present invention and the molding die for molding the screw cap are such that the sealing ring of the screw cap can be ruptured in a continuous manner between the band provided with a predetermined slit and the end of the band. Formed in the form of a ring by the weakened part, the cutting prevention part is formed by a molding die in the vicinity of both ends of the outer periphery of the band, and the cutting prevention part of the sealing ring is formed on the cavity inner surface of the molding die When the screw cap is molded, the molded part of the cavity engages with the cutting prevention part of the sealing ring and the vicinity thereof, thereby fixing the vicinity of both ends of the band of the sealing ring, thereby fixing the screw from the core. When removing the cap, it is possible to prevent the gap between the slits of the sealing ring from being widened and prevent a defective product from being produced at the time of molding.

In addition, the screw cap with seal of the present invention is weakened by connecting the cap body and the sealing ring while cutting the weakened portion connecting the both ends of the band of the sealing ring by the rotation of the cap at the time of opening the lid. The strip is cut, the strip becomes a strip, and the cap can be removed from the container body.
When the weakened piece that continuously connects the cap main body and the sealing ring of the cap and the weakened portion of the sealing ring are cut off, the trace remains, so that it is possible to confirm the tampering of the cap.

Furthermore, since the sealing ring remains connected to the cap body, the sealing ring hinders the closing when the lid is closed again.
When the lid is opened, the sealing ring can be removed from the container main body while being continuously connected to the cap main body. Therefore, after the container is used, the container main body and the cap having different constituent materials can be easily separated and discarded.

It is explanatory drawing of the screw cap with a seal | sticker of 1st Example of this invention, and the shaping die which shape | molds this screw cap, (a) is a cross-sectional front view of a screw cap with a seal and a shaping die, (b) is a sealing. It is a front view of an attached screw cap. It is explanatory drawing of the screw cap with a sealing, (a) is a cross-sectional side view, (b) is a bottom view of a sealing strip. It is explanatory drawing of a shaping die, (a) is a bottom view of a middle slide cavity, (b) is a top view of a lower cavity. It is explanatory drawing of the screw cap with a seal | sticker of 2nd Example of this invention, and the shaping die which shape | molds this screw cap, (a) is a cross-sectional front view of a screw cap with a seal and a shaping die, (b) is sealing. It is a front view of an attached screw cap. It is explanatory drawing of the screw cap with a sealing, (a) is a cross-sectional side view, (b) is a bottom view of a sealing strip. It is explanatory drawing of a shaping die, (a) is a bottom view of a middle slide cavity, (b) is a top view of a lower cavity. It is explanatory drawing of the screw cap with a seal | sticker of 3rd Example of this invention, and the shaping die which shape | molds this screw cap, (a) is a cross-sectional front view of a screw cap with a seal and a shaping die, (b) is sealing. It is a front view of an attached screw cap. It is explanatory drawing of the screw cap with a sealing, (a) is a cross-sectional side view, (b) is a bottom view of a sealing strip. It is explanatory drawing of a shaping die, (a) is a bottom view of a middle slide cavity, (b) is a top view of a lower cavity. It is explanatory drawing of the screw cap with a seal | sticker of 4th Example of this invention, and the shaping die which shape | molds this screw cap, (a) is a cross-sectional front view of a screw cap with a seal and a shaping die, (b) is sealing. It is a front view of an attached screw cap. It is explanatory drawing of the screw cap with a sealing, (a) is a cross-sectional side view, (b) is a bottom view of a sealing strip. It is explanatory drawing of a shaping die, (a) is a bottom view of a middle slide cavity, (b) is a top view of a lower cavity.

  Next, examples of the screw cap with a seal according to the present invention will be described with reference to the drawings.

In FIG. 1, A is a screw cap with a synthetic resin seal screwed to the mouth tube portion of the container body, and B is a molding die for molding the screw cap A.
In FIG. 2, C is a container main body to which a screw cap A is screwed. A screw 1 is screwed on the upper part of the mouth tube portion of the container main body C, and the other outer periphery extends from the middle to the lower side. An engagement recess 2 having a smaller diameter is formed.

  As shown in FIGS. 1 and 2, the screw cap A is composed of a cap body A1 and a sealing ring A2 provided continuously with the lower end of the cap body A1.

The cap main body A1 includes a top wall 5 and an outer peripheral wall 6. A screw 7 that is screwed to the screw 1 of the mouth tube portion of the container main body C projects from a central portion of the inner periphery of the outer peripheral wall 6, A plurality of locking recesses 8 are disposed at predetermined positions on the lower end of the wall 6.
Further, a knurling or the like is provided on the outer periphery of the outer peripheral wall 6 to prevent slippage.

The sealing ring A2 is a breakable weakening portion 12 in which a belt body 11 provided with a predetermined slit 10 and formed in a circle shape and an inner lower end portion of the side surface of the slit 10 between the end portions 11a and 11b of the belt body 11 are connected. And is formed in a ring shape.
The end 11a of the band 11 is on the opposite side of the opening direction across the slit 10, and the end 11b is in the opening direction.

  As shown in FIG. 1, a cutting prevention recess 13 is formed by a molding die B in the vicinity of the end 11 a and the end 11 b on the outer periphery of the band 11.

As shown in FIG. 1, a plurality of locking claw pieces 14 are formed on the inner periphery of the belt body 11 so as to be inclined inward and downward when the screw cap A is molded.
Similarly to the known ones, the locking claw piece 14 extends inwardly in an upward direction as shown in FIG. 2 in the post-molding process, and engages with the mouth tube portion of the container body C when the lid is closed. Molded so as to engage with the concavity 2.

  A plurality of locking projections 15 that engage with the locking recesses 8 of the cap body A1 are disposed on the upper surface of the belt body 11 at predetermined locations.

  At least two of the locking recesses 8 of the cap main body A1 and the locking protrusions 15 that engage with the locking recesses A1 are disposed at locations apart from the ends 11a and 11b of the band 11 of the sealing ring A2. ing.

  The outer peripheral wall 6 and the sealing ring A2 of the cap main body A1 leave the lower surface of the outer peripheral wall 6 and the upper surface of the belt body 11 in the vicinity of the end portion 11b and the end portion 11a, and also engage with the locking recess portion 8 and the engaging recess portion 8. A plurality of breakable weakening pieces 16 that are provided in the vicinity of the stop protrusion 15 and the end 11a of the band 11 of the sealing ring A2 are provided, and are thicker and relatively stronger than the weakening pieces 16. The connection weakening piece 17 is connected.

As shown in FIGS. 1 and 3, the molding die B includes an upper cavity B1, a middle slide cavity B2, a lower cavity B3, a core B4, and a cylindrical core B5, and a space for molding the screw cap A. Is forming.
Further, the molding die B is formed with a sprue and a passage for introducing the molten resin.

  The upper cavity B1 is configured to mold the outer periphery of the cap body A1 of the screw cap A.

  The middle slide cavity B2 is a mold whose upper surface engages with the lower surface of the upper cavity B1 and can be opened and closed to the left and right. The lower end of the outer periphery of the cap body A1 of the screw cap A, the outer periphery of the sealing ring A2, and the cap body A slit 10 of the band 11 of the sealing ring A2 is formed between A1 and the sealing ring A2.

  In the portion of the sealing ring A2 at the lower part of the middle slide cavity B2 where the band 11 is formed, an engagement recess 20 is formed in the vicinity of the cut prevention recess 13 at the end 11a and the end 11b from the lower end surface. Yes.

  The lower cavity B3 is a mold in which the upper surface engages with the lower surface of the middle slide cavity B2, and the cylindrical core B5 is movable in the vertical direction on the inner periphery, and the lower surface of the band 11 of the sealing ring A2 of the screw cap A Is supposed to form.

  On the upper surface of the lower cavity B3, engaging convex portions 25 that engage with the engaging concave portions 20 of the middle slide cavity B2 are disposed at respective positions.

On the inner surface of each engaging convex portion 25, a protruding convex portion 26 that forms the cut preventing concave portion 13 of the sealing ring A2 is projected.
The inner surface of the engagement convex part 25 forms the cutting prevention recessed part 13 and the vicinity of the end part 11a of the band 11 of the sealing ring A2 and the cutting prevention recessed part 13 of the end part 11b.

  The core B4 forms the entire inner periphery of the cap body A1 of the screw cap A, the inner periphery of the upper portion of the band 11 of the sealing ring A2, and the inner surface of the locking claw piece 14.

  The cylindrical core B5 is a mold that can move in the vertical direction on the outer periphery of the core B4 and that can move in the vertical direction on the inner periphery of the lower cavity B3, and is located in the lower part of the band 11 of the sealing ring A2 of the screw cap A. A circumference and an outer surface of the locking claw piece 14 are formed.

Next, the effect at the time of shaping | molding of a present Example is demonstrated.
First, molten resin is poured into the space formed by the molding die B from the sprue provided in the upper cavity B1, and the screw cap A is molded.

  When the resin is cooled to a certain temperature and solidifies, first, the upper cavity B1 is extracted, and then the middle slide cavity B2 is opened to the left and right.

  Next, the cylindrical core B5 is extracted, and then the lower cavity B3 is raised, whereby the screw cap A itself is raised and extracted from the core B4.

  When the screw cap A is removed from the core B4, the screw cap A itself, in particular, the sealing ring A2 is expanded outwardly. However, in this embodiment, each engagement protrusion of the lower cavity B3 is expanded. The inner surface of the portion 25 and the molding convex portion 26 engage with the vicinity of the cutting prevention concave portion 13 of the end 11a and the end portion 11b of the sealing ring A2 and the cutting prevention concave portion 13 to press the sealing ring A2. By fixing the vicinity of the end 11a and the end 11b of the band 11, the other part of the sealing ring A2 spreads outward and deforms, whereas the end 11a and the end 11b of the band 11 are deformed. It is possible to prevent the slit 10 from being widened and to cut the weakened portion 12.

  Finally, when the screw cap A is removed from the lower cavity B3, the screw cap A is formed.

  When the cylindrical core B5 and the core B4 are pulled out, the locking claw piece 14 of the band 11 is formed inwardly downward as shown in FIG. 1, but is well known as shown in FIG. Similarly to the above, the locking claw piece 14 is deformed inward and upward in a step after molding.

  In the present invention, the end 11a and the vicinity of the end 11b of the band 11 of the sealing ring A2 are fixed by the inner surfaces of the respective engaging projections 25 of the lower cavity B3, so that the screw cap A is removed from the core B4. At this time, it is possible to prevent the weakened portion 12 of the belt body 11 from being cut, and it is possible to prevent a defective product from being cut out of the sealing body A2 of the screw cap A during molding.

Next, the usage mode and operation effect of the screw cap with seal of the present embodiment will be described.
First, the screw cap A is rotated in the screwing direction, is attached to the mouth tube portion of the container body C, and is closed as shown in FIG.
When the screw cap A is rotated and lowered with respect to the mouth tube portion of the container main body C, it is provided in the locking recess 8 provided in the outer peripheral wall 6 of the cap main body A1 and the band 11 of the sealing ring A2. Engaging with the locking projection 15 pushes the sealing ring A2 downward as the cap body A1 descends, and rotates the entire sealing ring A2 with the rotational force of the cap body A1.

  When the sealing ring A2 rotates together with the rotation of the cap main body A1, the weakening piece 16 and the connection weakening piece 17 that connect the cap main body A1 and the sealing ring A2 and the weakening that connects the belt body 11 together. It is possible to prevent the portion 12 from being burdened, and it is possible to prevent the weakening piece 16 and the connection weakening piece 17 and the weakening portion 12 from being cut when the lid is initially closed.

  When the screw cap A is opened, the upper end surface of the engagement recess 2 of the container main body C and the locking claw piece 14 of the sealing ring A2 are brought into contact with the rising due to the rotation of the cap main body A1. As the ring A2 is prevented from rising and the sealing ring A2 is prevented from rotating, the cap body A1 and the sealing ring A2 are separated, and the weakened piece 16 connecting the cap body A1 and the sealing ring A2 is cut. I will do it.

  Further, as the cap body A1 is raised, the connection weakening piece 17 that connects the cap body A1 and the sealing ring A2 is stronger than the weakening piece 16, so the end of the band 11 of the sealing ring A2 The vicinity of 11a rises together with the cap body A1, the height difference between the end 11a and the end 11b of the band 11 increases, and the weakened part 12 that connects the end 11a and end 11b of the band 11 continuously. Is disconnected.

  When the weakened portion 12 is cut, the shape retaining property of the band 11 of the sealing ring A2 is weakened, and the lower side is twisted outward from the end portion 11b side with the tip of the locking claw piece 14 as a fulcrum. Then, the engagement between the engaging claw piece 14 and the upper end surface of the engaging recess 2 of the container body C is released, and the belt body 11 is deformed so that the vicinity of the end portion 11a is upward and the end portion 11b side is downward. The

  When the cap main body A1 continues to rise, the sealing ring A2 is completely removed from the mouth tube portion of the container main body C together with the cap main body A1, and the screw cap A is opened from the container main body C.

In the screw cap with seal of the present embodiment, the weakening piece 16 connecting the cap body A1 of the screw cap A and the sealing ring A2 and the weakening portion 12 of the sealing ring A2 are cut at the first opening. , Tampering can be visually recognized.
Further, at the first opening, the end of one side of the sealing ring A2 has a band-like shape. Even if it is attempted to close the lid again, the lid is prevented from being closed.

  When the cap body A1 is closed to the mouth tube portion of the container body C, a finger is put on the end portion 11b of the band 11 of the sealing ring A2, and the cap weakening piece 17 is cut by pulling the cap body A1. The sealing ring A2 is removed from the cap body A1.

  Since the connection weakening piece 17 is pulled downward when the lid is first opened, the strength of the connection weakening piece 17 itself is reduced compared to the original state, so that the connection weakening piece 17 can be easily separated.

  When the screw cap with a seal of the present embodiment is closed after the sealing ring A2 is removed from the cap body A1, the appearance as a cap changes, and the weakening piece 16 and the connection weakening piece at the lower end of the outer peripheral wall 6 of the cap body A1. Since 17 cut marks remain, it is possible to confirm the unauthorized opening.

  Further, since the sealing ring A2 is removed from the container main body C together with the cap main body A1, the sealing ring A2 does not remain in the container main body C. Therefore, after the container is used, the container main body C and the screw cap A that are made of different materials can be easily used. Can be separated and discarded.

  In the embodiment described above, a plurality of the locking claw pieces 14 of the sealing ring A2 are formed on the inner periphery of the band body 11, but in particular, by not being disposed in the vicinity of both end portions 11a and 11b of the band body 11. When the screw cap A is attached to the container main body C, the locking claw piece 14 comes into contact with the mouth tube portion of the container main body A and tries to slightly expand the sealing ring A2, but both end portions 11a of the sealing ring A2 are used. , 11b is not deformed, and the weakened portion 12 can be prevented from breaking.

Next, a second embodiment in which the configuration of the sealing ring of the first embodiment is changed will be described.
The same components as those in the first embodiment of the present embodiment are denoted by the same reference numerals, detailed description thereof will be omitted, and differences will be mainly described.

  In FIG. 4, Aa is a screw cap with a synthetic resin seal screwed into the mouth tube portion of the container body C, and Ba is a molding die for molding the screw cap Aa.

  As shown in FIGS. 4 and 5, the screw cap Aa includes a cap main body Aa1 and a sealing ring Aa2 provided continuously to the lower end of the cap main body Aa1.

  The cap main body Aa1 is composed of a top wall 5 and an outer peripheral wall 6, and a screw 7 that is screwed into the screw 1 of the mouth tube portion of the container main body C protrudes from a central portion of the inner periphery of the outer peripheral wall 6. .

  The sealing ring Aa2 is formed in a ring shape by a band 31 formed in a circular shape by providing a central portion extending in the lateral direction and a deforming slit 30 extending in either of the upper and lower directions from both ends thereof.

  The end of the band 31 has an end 31a opposite to the opening direction across the deformation slit 30, an upper band end 32 extending laterally from the top of the end 31a, and the opening direction. End portion 31b and a lower band end portion 33 extending in the lateral direction from the lower portion of the end portion 31b. The end portion 31a of the band body 31 and the inner lower end of the tip of the lower band end portion 33 are Is formed with a breakable weakening portion 12 which is continuously provided.

  In the vicinity of the end 31a on the outer periphery of the band 31 and the tip of the lower band end 33, a cutting prevention recess 13 is formed by a molding die Ba.

A plurality of locking claw pieces 14 including a lower band end portion 33 are provided at the lower inner periphery of the band 31.
Further, similarly to the first embodiment, the locking claw pieces 14 may not be disposed in the vicinity of both end portions 31 a and 31 b of the band 31.

  The outer peripheral wall 6 of the cap main body Aa1 and the sealing ring Aa2 are connected by a plurality of breakable weakening pieces 16 arranged.

As shown in FIGS. 4 and 6, the molding die Ba is composed of an upper cavity B1, a middle slide cavity Ba2, a lower cavity B3, a core B4 and a cylindrical core B5, and a space for molding the screw cap Aa. Is forming.
Further, the molding die Ba is formed with a sprue for introducing the molten resin and a passage.

  The middle slide cavity Ba2 is a mold whose upper surface engages with the lower surface of the upper cavity B1 and can be opened and closed left and right. The lower end of the outer periphery of the cap body Aa1 of the screw cap Aa, the outer periphery of the sealing ring Aa2, and the cap body A deformation slit 30 of the band 31 of the sealing ring Aa2 is formed between Aa1 and the sealing ring Aa2.

  In the portion of the sealing ring Aa2 at the lower part of the middle slide cavity Ba2 where the band 31 is formed, the engagement recess 20 is formed in the vicinity of the cut prevention recess 13 at the end 31a and the lower band end 33 from the lower end surface. Is formed.

  The lower cavity B3 is a mold in which the upper surface engages with the lower surface of the middle slide cavity Ba2 and the cylindrical core B5 is movable in the vertical direction on the inner periphery, and the lower surface of the band 31 of the sealing ring Aa2 of the screw cap Aa Is supposed to form.

On the upper surface of the lower cavity B3, an engaging convexity is formed which is engaged with the engaging concave portion 20 of the middle slide cavity Ba2 and a molding convex portion 26 is formed on the inner surface so as to form a cutting prevention concave portion 13 of the sealing ring Aa2. The part 25 is arrange | positioned in each position.
The inner surface of the engagement convex part 25 forms the cutting prevention recessed part 13 and the end part 31a of the band 31 of the sealing ring Aa2 and the vicinity of the cutting prevention recessed part 13 of the lower band end part 33.

Next, the effect at the time of shaping | molding of a present Example is demonstrated.
First, molten resin is poured from a sprue provided in the upper cavity B1 into a space formed by the molding die Ba to mold the screw cap Aa.

  When the resin is cooled to a constant temperature and solidifies, first, the upper cavity B1 is extracted, and then the middle slide cavity Ba2 is opened to the left and right.

  Next, the cylindrical core B5 is extracted, and then the lower cavity B3 is raised, whereby the screw cap Aa itself is raised and extracted from the core B4.

When the screw cap Aa is pulled out from the core B4, the screw cap Aa itself, in particular, the sealing ring Aa2, is expanded outwardly. However, in this embodiment, each engagement protrusion of the lower cavity B3 is expanded. The inner surface of the portion 25 and the molding convex portion 26 are engaged with the end 31a of the band 31 of the sealing ring Aa2 and the vicinity of the cut prevention recess 13 of the lower band end 33 and the cut prevention recess 13 to press the sealing ring Aa2. By fixing the vicinity of the end 31a of the band 31 and the lower band end 33 of the ring Aa2, the other part of the sealing ring Aa2 spreads outward and deforms, whereas the end of the band 31 It is possible to prevent the deformation slit 30 between the portion 31a and the lower band end portion 33 from being widened and to prevent the weakened portion 12 from being cut.
Other functions and effects during molding are the same as those of the first embodiment.

Next, the usage mode and operation effect of the screw cap with seal of the present embodiment will be described.
When opening the screw cap Aa, the upper end surface of the engagement concave portion 2 of the container main body C and the locking claw piece 14 of the sealing ring Aa2 are brought into contact with the rising due to the rotation of the cap main body Aa1. The cap body Aa1 attempts to rise while the rise of the ring Aa2 is prevented.

  When the cap main body Aa1 and the sealing ring Aa2 are pulled apart by the contact of the locking claw piece 14 of the sealing ring Aa2, first, the lower band end 33 of the band 31 whose upper part is not connected to the other lower surface. Is separated from the upper belt end 32 and is deformed as the other rises, and the cap body Aa1 and the sealing ring Aa2 are separated from each other, and the weakening piece 16 connecting the cap body Aa1 and the sealing ring Aa2 is provided. It is cut from the end 31b side.

  Further, since the locking claw piece 14 is not disposed at the upper band end portion 32 of the band 31, the upper band end portion 32 and its vicinity rise together with the cap body Aa 1, and the end of the band 31 A difference in height between the portion 31a and the tip of the lower band end portion 33 is increased, and the weakened portion 12 provided in a row is cut.

  When the weakened portion 12 is cut, the shape retaining property of the band 31 of the sealing ring Aa2 is weakened, and the lower side is twisted outward from the end 31b side with the tip of the locking claw piece 14 as a fulcrum. The engagement between the pawl piece 14 and the upper end surface of the engagement recess 2 of the container main body C is released, and the band body 31 has the upper band body end portion 32 and the vicinity of the end portion 31a upward and the end portion 31b side downward. Will be transformed.

  When the cap body Aa1 continues to rise, the sealing ring Aa2 is completely connected to the cap body Aa1 in the vicinity of the upper band end portion 32 via the weakening piece 16 so that the mouth tube portion of the container body C is completely formed. The screw cap Aa is opened from the container body C.

When closing the cap main body Aa1 to the mouth tube portion of the container main body C, a finger is placed on the end 31b side of the band 31 of the sealing ring Aa2 and pulled against the cap main body Aa1, and the remaining weakened piece 16 is removed. The sealing ring Aa2 is cut and removed from the cap body Aa1.
Other functions and effects are the same as those of the first embodiment.

Next, a description will be given of a third embodiment in which the configuration of the sealing ring and the molding die of the first embodiment is changed.
The same components as those in the first embodiment of the present embodiment are denoted by the same reference numerals, detailed description thereof will be omitted, and differences will be mainly described.

  In FIG. 7, Ab is a screw cap with a synthetic resin seal screwed to the mouth tube portion of the container body C, and Bb is a molding die for molding the screw cap Ab.

  As shown in FIGS. 7 and 8, the screw cap Ab is composed of a cap main body Ab1 and a sealing ring Ab2 connected to the lower end of the cap main body Ab1.

  Cut prevention protrusions 35 are formed by the molding die Bb in the vicinity of the end 11a and the end 11b on the outer periphery of the band 11 of the sealing ring Ab2.

As shown in FIGS. 7 and 9, the molding die Bb includes an upper cavity B1, a middle slide cavity B2, a lower cavity Bb3, a core B4, and a cylindrical core B5, and a space for molding the screw cap Ab. Is forming.
Further, a sprue and a passage for introducing the molten resin are formed in the molding die Bb.

  On the upper surface of the lower cavity Bb3, engaging convex portions 40 that engage with the engaging concave portions 20 of the middle slide cavity B2 are disposed at respective positions.

Formed concave portions 41 that form the cut preventing convex portions 35 of the sealing ring Ab2 are formed in the inner surfaces of the respective engaging convex portions 40.
The inner surface of the engagement convex portion 40 forms the cutting prevention convex portion 35 and the vicinity of the end portion 11a of the band 11 of the sealing ring Ab2 and the cutting prevention convex portion 35 of the end portion 11b.

Next, the effect at the time of shaping | molding of a present Example is demonstrated.
First, molten resin is poured into the space formed by the molding die Bb from the sprue provided in the upper cavity B1, and the screw cap Ab is molded.

When the lower cap Bb3 is raised, the screw cap Ab itself is lifted and removed from the core B4. In this embodiment, the inner surface of each engaging convex portion 40 and the molding concave portion 41 of the lower cavity Bb3 are connected to the sealing ring Ab2. The end 11a and the end 11b of the belt 11 are engaged with and pressed by the vicinity of the cut prevention projection 35 and the cut prevention projection 35, and the end 11a and the end 11b of the band 11 of the sealing ring Ab2 are pressed. By fixing the vicinity, the other part of the sealing ring Ab2 spreads outward and deforms, whereas the slit 10 between the end 11a and the end 11b of the band 11 is prevented from being widened and weakened. It is possible to prevent the portion 12 from being cut.
Other functions and effects during molding are the same as those of the first embodiment.
Further, the usage mode and the operational effect of the screw cap are the same as those of the first embodiment.

Next, a description will be given of a fourth embodiment in which the configuration of the sealing ring and the molding die of the second embodiment is changed based on the configuration of the third embodiment.
The same components as those of the second and third embodiments of the present embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and differences will be mainly described.

  In FIG. 10, Ac is a screw cap with a synthetic resin seal screwed onto the mouth tube portion of the container body C, and Bc is a molding die for molding the screw cap Ac.

  As shown in FIGS. 10 and 11, the screw cap Ac includes a cap main body Ac1 and a sealing ring Ac2 provided continuously to the lower end of the cap main body Ac1.

  In the vicinity of the end 31a of the outer periphery of the band 31 of the sealing ring Ac2 and the tip of the lower band end 33, a cut preventing projection 35 is formed by the molding die Bc.

As shown in FIGS. 10 and 12, the molding die Bc includes an upper cavity B1, a middle slide cavity Bc2, a lower cavity Bc3, a core B4, and a cylindrical core B5, and a space for molding the screw cap Ac. Is forming.
In addition, a sprue and a passage for introducing the molten resin are formed in the molding die Bc.

  On the upper surface of the lower cavity Bc3, engagement convex portions 40 that engage with the engagement concave portions 20 provided on the lower end surface of the middle slide cavity Bc2 are disposed at respective positions.

Formed concave portions 41 that form the cut preventing convex portions 35 of the sealing ring Ac2 are formed in the inner surfaces of the respective engaging convex portions 40.
The inner surface of the engaging convex portion 40 forms the cutting prevention convex portion 35 and the vicinity of the end portion 31a of the band 31 of the sealing ring Ac2 and the cutting prevention convex portion 35 of the lower band end portion 33.

Next, the effect at the time of shaping | molding of a present Example is demonstrated.
First, molten resin is poured into the space formed by the molding die Bc from the sprue provided in the upper cavity B1, and the screw cap Ac is molded.

By raising the lower cavity Bc3, when the screw cap Ac itself is raised and removed from the core B4, in this embodiment, the inner surface of each engaging convex portion 40 and the molding concave portion 41 of the lower cavity Bc3 are formed in the sealing ring Ac2. The end 31a of the band 31 and the end 31a of the lower band end 33 are engaged with the vicinity of the cutting prevention convex part 35 and the cutting prevention convex part 35, and are pressed and pressed with the end 31a of the band 31 of the sealing ring Ac2. By fixing the vicinity of the lower band end 33, the other part of the sealing ring Ac2 spreads outward and deforms, whereas the end 31a of the band 31 and the lower band end 33 It is possible to prevent the deformation slit 30 from being widened and to prevent the weakened portion 12 from being cut.
Other functions and effects during molding are the same as those of the second embodiment.
Further, the usage mode and the operational effect of the screw cap are the same as those of the second embodiment.

  In each of the above embodiments, the slits or deformation slits connected by the weakening portion are used between the band members of the sealing ring of the screw cap. However, the vicinity of the slit is fixed by a mold for molding the outer periphery of the screw cap. Therefore, it is possible to prevent the weakened portion provided in and connected to the slit of the band from being cut, and the slit of the band formed in a ring shape connected by the weakened portion is not limited to the shape of each of the above embodiments. .

  Further, the invention of the present application can prevent the weakened portion connecting the belt bodies from being cut by forcibly removing from the core at the time of molding, so that the method of connecting the cap body and the sealing ring and the method for deleting the sealing ring associated therewith Any configuration may be used, and the present invention is not limited to the configuration of the connection between the cap body and the sealing ring of each of the embodiments and the deletion method associated therewith.

  The screw cap with seal of the present invention can prevent a part of the seal ring from being cut when being pulled out from the core at the time of molding, and can improve productivity. Sometimes the sealing ring is reliably removed from the container main body together with the cap main body, so that it can be widely used as a cap or a cap molding method that can easily separate and discard the cap and the container main body.

A, Aa, Ab, Ac Screw cap A1, Aa1, Ab1, Ac1 Cap body A2, Aa2, Ab2, Ac2 Sealing ring B, Ba, Bb, Bc Mold B1 Upper cavity B2, Ba2, Bc2 Middle slide cavity B3, Bb3, Bc3 Lower cavity B4 Core B5 Tubular core C Container body 1, 7 Screw 2 Engaging recess 5 Top wall 6 Outer wall 8 Locking recess 10 Slit 11, 31 Band 11a, 11b, 31a, 31b End 12 Weak Part 13 Cutting prevention concave part 14 Locking claw piece 15 Locking convex part 16 Weaking piece 17 Connection weakening piece 20 Engaging concave part 25, 40 Engaging convex part 26 Molding convex part 30 Deformation slit 32 Upper belt end part 33 Lower belt body End 35 Cut prevention convex part 41 Molding concave part

Claims (7)

In a screw cap with a synthetic resin seal screwed to the mouth tube portion of the container body, and a molding die for molding the screw cap,
The screw cap consists of a cap body and a sealing ring connected to the lower end of the cap body.
The sealing ring is formed in a ring shape by a band that is provided with a predetermined slit and a breakable weakening that continuously connects the inside of the slit side surface between the ends of the band.
In the vicinity of both ends of the outer periphery of the belt body, a cutting prevention portion is formed,
A plurality of locking claw pieces that are engaged with the lower outer periphery of the mouth tube portion of the container body when the lid is closed are disposed on the lower inner periphery of the belt body,
The lower surface of the outer peripheral wall of the cap body and the upper surface of the sealing ring are connected by a weakening piece that can be broken,
The molding die includes a cavity that molds the outer periphery of the screw cap and a core that molds the inner periphery of the screw cap.
On the inner surface of the cavity, a molding part that forms a cutting prevention part of the sealing ring is disposed,
A sealing part characterized in that, at the time of screw cap molding, the molding part of the cavity and its vicinity engage with the cutting prevention part of the sealing ring and its vicinity to fix the vicinity of both ends of the band of the sealing ring. A screw cap with a die and a molding die for molding the screw cap. The mold cavity has an upper cavity that molds the outer periphery of the cap body, a lower outer periphery of the cap body and the outer periphery of the sealing ring, and a middle slide that can be opened and closed left and right to mold between the cap body and the sealing ring. Consisting of a cavity and a lower cavity forming the lower surface of the sealing ring,
In the lower part of the middle slide cavity, an engagement recess is formed in the vicinity of the cutting prevention part of the part forming the band of the sealing ring,
On the upper surface of the lower cavity, an engagement convex portion that engages with an engagement concave portion of the upper cavity and the middle slide cavity is disposed,
The sealed inner surface according to claim 1, wherein an inner surface of the engagement convex portion forms a vicinity of the cutting prevention portion of the band of the sealing ring and is provided with a molding portion that forms the cutting prevention portion. A screw cap and a molding die for molding the screw cap. The cutting prevention part of the band of the sealing ring is a recess,
3. The screw cap with a seal according to claim 1 or 2, and the molding die for molding the screw cap, wherein the molding portion of the molding die is a convex portion corresponding to the concave portion of the cutting prevention portion. The cutting prevention part of the band of the sealing ring is a convex part,
3. The screw cap with a seal according to claim 1 or 2, and a molding die for molding the screw cap, wherein the molding portion of the molding die is a concave portion corresponding to the convex portion of the cutting prevention portion. A plurality of locking recesses are disposed at predetermined locations on the lower end of the outer peripheral wall of the cap body,
The screw cap with a seal according to any one of claims 1 to 4, wherein a plurality of locking projections that engage with the locking recess are disposed at predetermined locations on the upper surface of the band of the sealing ring. . The weakening piece that connects the lower surface of the outer peripheral wall of the cap body and the upper surface of the band of the sealing ring,
The sealing end according to any one of claims 1 to 5, wherein an end portion side opposite to the opening direction of the belt body is a connection weakening piece that is thicker and relatively stronger than the other weakening pieces. With screw cap. The slit of the sealing ring is formed in the deformation slit,
The end of the belt body has an upper belt end extending from the top of the end opposite to the opening direction across the deformation slit, and a lower belt end extending from the bottom of the edge in the opening direction And form the
The breakable weakening part which connects both ends is formed inside the end opposite to the opening direction and the tip of the lower band end, A screw cap with a seal according to any one of the above.

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