JP5326087B2 - Synthetic spout - Google Patents

Description

  The present invention relates to a synthetic resin spout for a container, and more particularly to a synthetic resin spout having a flange portion that can be welded to the peripheral edge of the opening of the container.

  Conventionally, for example, as a spout of a container such as a paper pack laminated with a heat-sealable synthetic resin film, a flange having a surface to be heat-welded with the container is provided on the outer peripheral surface of the dispensing cylinder extending in a cylindrical shape from the flange. A synthetic resin spout (hereinafter simply referred to as a spout) in which a screw thread is formed and a cap can be screwed is widely adopted, and the opening peripheral portion of the container and the sealing surface of the flange are thermally welded to the container. They are integrated to form a spout plug. Further, as a spout for attaching a container opening to a container sealed with a sealing material such as an aluminum foil laminated film, a spout incorporating a cylindrical cutter for breaking the sealing material is also well known. The cylindrical cutter is molded separately in advance and incorporated into a dispensing cylinder or cap (for example, see Patent Document 1), or via a connecting bridge that can be broken in a state of projecting coaxially below the spout body. There is known one in which the connecting bridge is broken at the time of assembly so that the cylindrical cutter engages with the spout cylinder of the spout body (see, for example, Patent Document 2).

  By the way, when heat-welding the flange surface of the spout body and the packaging material of the container, if the welding is not complete, there is a possibility that leakage occurs between the welding surfaces. In particular, if the surface is a flat surface having a large area such as a flange surface, the welding pressure does not act uniformly and the welding becomes sweet, and a leakage path is likely to occur partially. For this reason, an annular welding rib is conventionally formed on the flange surface so that the pressure can be concentrated and evenly applied to the welding rib surface so as to be firmly welded (for example, see Patent Document 1). By forming the annular rib on the flange, it is possible to perform strong welding without causing leakage. However, when such a spout is molded from a synthetic resin, if the mold is a split mold, the annular rib is in the diametrical direction. Since it is an undercut portion, the split mold that opens to the left and right cannot be forcibly removed when the mold is opened, and the annular rib may be damaged or deformed.

  Therefore, in order to form an annular rib having a uniform top surface without deforming or damaging the flange surface, it is desirable to use an upper and lower mold that opens up and down. For example, in the case of the spout shown in Patent Document 1, an annular rib is formed on the lower surface of the flange, but the lower surface portion of the flange can be formed by a lower mold that moves up and down, and can be opened without difficulty. However, in the case shown in Patent Document 2, for example, when the cylindrical cutter is integrally formed in a state of protruding downward via the connection bridge, the cylindrical cutter portion also has an undercut portion in the vertical direction. In addition, since the connection bridge is broken with a slight force, it is difficult to form the upper and lower molds, and it is necessary to rely on the mold using the split mold. In that case, if there is an annular rib on the flange surface as described above, the annular rib cannot be formed, and it is not possible to form the annular rib, but it is simply flat or formed as a parallel rib parallel to the mold opening direction. doing.

No. 4-1056 JP 2001-106249 A

If it is simply welded to a flat surface without forming ribs on the flange surface, there is a risk that the welding strength will be non-uniform and leakage paths will be likely to occur, and in the case of parallel ribs parallel to the mold release direction, the ribs will melt uniformly. Then, it is sufficient if the gaps between the ribs can be filled and welded uniformly, but if the welding is sweetened, there is a problem that the melting of the linear fused ribs becomes uneven and may leak from the ribs.
Therefore, the present invention can perform die-cutting without deforming or damaging the annular rib even when the annular rib is formed with a split mold on the welding surface of the flange, and can be securely sealed with the container body. An object of the present invention is to provide a spout having an annular rib that can be attached with high performance.

The spout according to the invention of claim 1 that solves the above-mentioned problems includes a flange that can be welded to the container body, and a dispensing cylinder having a male screw that is screwed to the cap on the outer peripheral surface extending upward from the inner peripheral edge of the flange. In the synthetic resin spout, a plurality of annular ribs are formed so as to protrude concentrically on the side of the flange that serves as a welding surface, and the top surfaces of the plurality of annular ribs are located on substantially the same plane to be main welded. And the inner side wall of the annular rib is an inclined side wall surface inclined in the axial direction from the top surface , and the annular rib in the radially innermost portion of the annular rib is the inclined side wall surface The inclination angle with respect to a horizontal plane perpendicular to the axis of the annular rib is larger than the inclination angle with respect to the horizontal plane perpendicular to the axis of the inclined side wall surface of the annular rib located outside thereof .

According to a second aspect of the present invention, in the synthetic resin spout according to the first aspect, the amount of protrusion on the inclined side wall surface side of the annular rib located at the innermost portion in the radial direction is the inclined side wall surface side of the annular rib located on the outer side. It is characterized by being larger than the protruding amount.

The invention according to claim 3 is the synthetic resin spout according to claim 1 or 2 , wherein the tubular bridge having a cutter blade at the lower end is ruptured in a state protruding coaxially downward from the flange. Therefore, the spout body is formed integrally with the spout body. Furthermore, the invention according to claim 4 is the synthetic resin spout according to any one of claims 1 to 3 , wherein the flange has a surface on the opposite side to the surface on which the annular rib is formed. The outer surface is inclined so that the flange cross section gradually becomes thinner from the outside toward the outside.

According to the first to fourth aspects of the present invention, a plurality of annular ribs are formed so as to protrude concentrically, and the top surfaces of these annular ribs are located on substantially the same plane to form a main welding surface. Since the inner side wall of the inner wall is an inclined side wall surface inclined in the axial direction from the top surface, the force acting on the inclined side wall surface during die cutting is reduced by the vertical component force compared to the case of the annular rib on the vertical side wall. The die can be removed without damaging the annular rib, and a good welded surface can be formed.
Further, according to the first and second aspects of the present invention, the annular rib located in the radially innermost portion among the annular ribs is inclined with respect to the inclined side wall surface and / or the annular rib from the annular rib located on the outer side. Since the trough is deeper, the maximum die-cutting resistance acts on the annular rib in the radially innermost part, and the non-welding surface opposite to the welding surface of the flange is not constrained by the mold or is not constrained. If it is loose, the flange will elastically deform to the opposite side from the base, so the resistance acting on the annular rib located outside the radially innermost annular rib will be further relaxed, and the annular rib located outside will be better molded Can be removed. Therefore, in this case, even if the annular rib located in the innermost radial direction is deformed or damaged, the annular rib located on the outer side can maintain a good main welding surface. It becomes possible.

According to invention of Claim 3 , even if a cylindrical cutter protrudes below a spout main body and it applies to the spout integrally formed with a spout main body, even if it forms an annular rib in a flange, Die-cutting is possible without breaking the connecting bridge connecting the spout body. Furthermore, according to the invention of claim 4 , even if the upper split mold and the lower split mold are punched at the same time, a gap is formed between the non-welded surface and the flange during punching. In particular, the force acting on the annular rib located outside the innermost annular rib in the radial direction can be alleviated, and die cutting can be performed without damaging the annular rib.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front view of a spout according to this embodiment in which a spout body and a cylindrical cutter are integrally formed, FIG. 2 is a front sectional view thereof, FIG. 3 is a bottom view thereof, and FIG. 4 is a perspective view thereof. In the spout 1 of this embodiment, the spout body 3 and the cylindrical cutter 4 are integrally formed, the cylindrical cutter 4 has a cutter blade 9 at the lower end, and projects coaxially below the flange of the spout body 3. Are connected via a plurality of connection bridges 5 (FIG. 3) that can be broken. The basic configuration of the cylindrical cutter 4 is formed on its outer peripheral surface with a male screw 6 that is screwed with a female screw 16 formed as a reverse screw on the inner peripheral surface of a spout cylinder 11 of the spout body 3 described later. On the surface, a vertical stripe-shaped ratchet piece 7 is formed to protrude. The ratchet piece 7 is locked by rotating a plurality of (four in the illustrated embodiment) locking pieces formed in a hanging manner from the ceiling wall surface of the cap, which will be described later, and rotating the cap in the opening direction. The cylindrical cutter is protruded downward by a screw action. As the above configuration, a known configuration such as that described in Patent Document 2 can be adopted, and the configuration is not particularly limited. In the figure, 8 is a reinforcing rib formed in a cross shape across the inner peripheral surface of the cylindrical cutter.

  The spout body 3 has a pouring cylinder 11 that is open at the top and bottom. A flange 12 is formed at the lower end of the outer surface of the pouring cylinder, and a tamper evidence band (hereinafter referred to as TE) formed on a cap on the flange 12 is formed. A ratchet pawl 13 that engages with a ratchet piece 44 formed on the inner peripheral surface of a band 43), a TE band drop preventing jaw 14 on the upper part, and a male screw 15 on the upper part. A female screw 16 that meshes with the male screw 6 of the cylindrical cutter 4 is formed on the inner peripheral surface of the dispensing cylinder 11 in the direction opposite to the male screw 15 on the outer peripheral portion.

  In the spout body 3 formed as described above, the present embodiment is particularly characterized by the configuration of the flange 12. That is, in the present embodiment, the lower surface of the flange 12 serves as the welding surface 20 and basically forms a flat surface, and a plurality of annular ribs 21 are formed on the flat surface. In the present embodiment, the annular rib 21 is formed into a triple rib of an annular rib 21-1 at the radially innermost portion, an annular rib 21-2 at the intermediate portion, and an annular rib 21-3 at the radially outermost portion. However, it is not necessarily limited to this, and it may be two or more.

  Each annular rib 21 has the following contrivance in its shape so that a great load is applied to the annular rib when it is cut out with a split mold, so that the annular rib 21 is not deformed or damaged. That is, as shown in FIG. 2 (b), an enlarged cross section of the main part of each annular rib 21, the top surface 22 forming the main welding surface is positioned on substantially the same plane, and the radially inner side wall is the axial center. The inclined side wall surface 23 is inclined in the direction, and the radially outer wall is a vertical wall surface 24. The inclination angle θi with respect to the horizontal plane perpendicular to the axis of the inclined side wall surface 23 of the radially innermost annular rib 21-1 is the axis of the inclined side wall surface 23 of the radially outer annular ribs 21-2 and 21-3. It is formed so as to have a relationship of θi> θo which is larger than the inclination angle θo with respect to a horizontal plane perpendicular to the center. The protruding amount hi of the inclined side wall surface 23 of the inclined side wall surface 23 of the radially innermost annular rib 21-1 is the inclined side wall surface side of the inclined side wall surface 23 of the radially outer annular ribs 21-2 and 21-3. It is formed so as to have a relationship of hi> ho larger than the protruding amount ho. In the present embodiment, the inclination angle and the protruding amount of the inclined side wall surface of the radially innermost annular rib 21-1 are made larger than those of the other annular ribs, and the other annular ribs are formed in the same size. However, the inclination angle and the protrusion amount may be gradually decreased in the radially outward annular rib as it is outward. In addition, it is desirable that the innermost annular rib 21-1 in the radial direction has a larger inclination angle and protrusion amount of the inclined side wall surface than the other annular ribs, but only one of them may be larger.

  Further, the upper surface of the flange 12 becomes a non-welding surface 25, and the non-welding surface 25 is formed in a downwardly inclined shape toward the radially outer side. Therefore, the flange 12 has a gradually thinned flange section outward from the outer peripheral surface of the spout.

  The spout 1 of the present embodiment is formed as described above, and the outer peripheral surface is formed by a split mold. However, since the annular rib formed on the flange is formed in the above shape, the split that opens to the left and right is as follows. Even in the case of molding using a mold, the annular rib can be removed without being damaged. FIG. 5 shows a progress diagram when the mold is cut by the split mold of the flange.

  FIG. 6A shows a state after the molding is completed. When the upper mold 30 and the lower mold 31 are simultaneously moved to the right in the drawing for releasing the mold, the inclined side wall surface 23 of the triple annular rib is shown. Is undercut and receives resistance, but the inclination angle θi of the inclined side wall surface of the radially innermost annular rib is larger than the inclination angle θo of the inclined side wall surface of the annular rib on the outer side, and the amount of protrusion Since hi is also larger than ho, it receives a larger mold opening resistance than other annular ribs. On the other hand, since the non-welding surface 25 that is the upper surface of the flange 12 is a downward inclined surface in the horizontal direction, when the upper mold 30 is opened, the inclined surface and the upper mold surface are inclined. A gap 33 proportional to the angle is formed. Therefore, the shearing force received from the inclined side wall surface of the annular rib, which is undercut due to die cutting, becomes a cantilever shape with a gradually decreasing cross section when viewed from the flange cross section, and the flange generates the maximum bending moment at the base. In addition, it can bend upward by elasticity by the gap from the base.

  In addition, as described above, the inclined side wall surface of the radially innermost annular rib is subjected to a larger mold opening resistance than the other annular ribs, and a large shearing force is generated at that portion. As a result of the larger bending, the resistance received by the inclined side wall surfaces of the annular ribs 21-2 and 21-3 located on the outer side thereof is reduced accordingly, and as shown in FIGS. Even if only the innermost annular rib 21-1 is subjected to a large shearing force and may be deformed, the annular ribs 21-2 and 21-3 positioned on the outer side thereof can be well punched without deformation. . Although the part shown in the figure shows a state where the inclined side wall of the annular rib is deformed, such deformation is not observed except for the radially innermost annular rib.

  Therefore, according to the present embodiment, as described above, the annular rib having the inclined inner side wall in the radial direction is formed in two or more layers, so that the annular rib located on the innermost side in the radial direction is deformed during die cutting. Even if it may occur, it can be satisfactorily punched without giving deformation or the like to at least one other annular rib located outside thereof, so that a good welding surface with the container body is formed by the annular rib. can do.

  Note that, as in the above-described embodiment, the inclination angle and the protruding amount of the inclined side wall surface of the annular rib located at the radially innermost side are made larger than the inclined side walls of the other annular ribs located on the outer side thereof, thereby The force is applied only to the annular rib located on the inner side, but the present invention is not necessarily limited to the above embodiment, and the inclination of the inclined side walls of all the annular ribs including the annular rib located on the radially innermost side is not necessarily limited. It is also possible to form the corners and the protruding amount in the same manner. In that case, the resistance received by the annular rib located on the outside is larger than in the case of the above embodiment, but the non-welding surface of the flange is inclined as described above, so that when the mold is opened, Since the elastic deformation is allowed to escape, the die can be removed without receiving a large resistance as in the prior art.

  In the above embodiment, the upper split mold 30 and the lower split mold 31 are opened at the same time. However, when the upper split mold 30 is opened first and then the lower split mold 31 is opened, a flange is removed when the lower split mold 31 is removed. Is not constrained by the upper split mold, the non-welding surface that is the upper surface of the flange does not need to be formed in an inclined manner as in the above embodiment, and can be formed on a horizontal plane in the same manner as a normal flange. . In that case, the vertical bending force (shearing force) received by the inclined side wall surface of the annular rib when the lower mold is cut allows the flange to be bent upward, and can be easily cut.

FIG. 6 shows an embodiment of a cap screwed onto the spout formed as described above, and FIG. 7 shows a state where the cap is screwed onto the spout body and attached to the container body.
The cap 40 according to the present embodiment has a top wall 41 and a skirt wall 42, and has a TE band 43 via a weakened portion at the lower end of the skirt wall. The top wall 41 hangs downward so that the ratchet piece 44 is engaged with the ratchet teeth 7 formed on the cylindrical cutter so that the engagement surface is positioned on the same circumference as the ratchet teeth 7. Are formed at equal intervals. Further, on the inner peripheral surface of the skirt wall 42, a female screw 45 that is screwed with the male screw 15 formed on the outer peripheral surface of the spout body 3 is formed. The weakened portion connecting the skirt wall 42 and the TE band 43 is composed of a plurality of bridges 46, and the lower end of the skirt wall 42 and the upper end of the TE band 43 are engaged with each other for rotation in the screw tightening direction. Thus, a triangular wave stopper locking projection 47 and a locking recess 48 are formed to rotate the TE band 43 integrally so as not to apply a load to the bridge 46. A ratchet piece 49 that engages with the ratchet pawl 13 formed on the outer peripheral surface of the spout cylinder of the spout body 3 is formed on the inner peripheral surface of the TE band. A plurality of TE band fall prevention ribs 50 that are engaged with the formed TE band fall prevention jaws 14 are formed at appropriate intervals.

  In order to attach the spout formed as described above to the container body, the cap 40 of FIG. 6 is screwed into the spout 1 in the state of FIG. 1, and the cylindrical cutter 4 is inserted into the spout cylinder of the spout body 3 in this state. By forcibly pushing it in, the connection bridge 5 is broken and formed on the outer peripheral surface of the cylindrical cutter 4 and on the inner peripheral surface of the spout body 3 of the spout body 3 as shown in FIG. The female screw 45 is engaged. In this state, the lower surface of the flange is positioned at the peripheral edge of the opening 71 of the container main body 70 and heated and pressed by a known method by heat press to thermally weld and integrate the flange welding surface 20 and the container main body. At that time, in the present invention, a plurality of annular ribs 21 are formed on the welding surface 20 of the flange 12 of the spout body 3, and at least one of the annular ribs is deformed or damaged during die cutting as described above. Since there is something that has not occurred, thermal stress acts on the top surface of the annular rib, and the annular rib becomes the main welding surface and can be melted and welded uniformly over the entire circumference. Can be welded with excellent sealing performance.

  FIG. 8 shows a state where the cap 40 is removed from the spout body 3 after opening from the state shown in FIG. By rotating the cap 40 in the opening direction, the cylindrical cutter 4 rotates in the reverse direction and descends downward to automatically remove the sealing material (not shown) attached to the opening of the container. Is broken and opened, and the state shown in FIG. 8 is obtained, and this state is maintained thereafter. Therefore, the content liquid can be poured out. After opening, the TE band 43 is in a state in which the fall prevention rib 50 is locked to the TE band fall prevention jaw portion 14 formed on the outer peripheral surface of the extraction cylinder and prevented from falling off and fitted to the outer periphery of the spout portion. The tamper-evident function is maintained.

  FIG. 9 shows a spout 60 according to another embodiment of the present invention, and this embodiment shows a case in which the spout 60 is simply composed of a flanged dispensing tube without having a cutter. As shown in 1 and cited document 1, it is applicable also when it has a cylindrical cutter. The spout 60 of the present embodiment is the same in that the spout body 62 has a flange 63 for welding to the container main body on the outer peripheral surface of the lower end of the pouring cylinder 62, but in this embodiment, the welding surface 64 has a welding surface 64. The upper surface of the flange 63 is different from the above embodiment in that the non-welding surface 65 that is an inclined surface is the lower surface of the flange. Therefore, in the present embodiment, the spout body 61 is inserted into the opening 71 of the container body 70 from the inside of the container, and the annular rib is formed by heat pressing with a heat press in a state where the upper surface of the flange 63 is in close contact with the inner periphery of the opening. 67 and the back surface of the container body 70 are welded together.

  Also in this embodiment, the welded surface 64 is formed with triple annular ribs for welding as in the above embodiment, but the configuration thereof is the same as in the above embodiment, and detailed description thereof is omitted. In this embodiment, the spout has a relatively simple structure. However, since the screw 66 and the TE band drop-off preventing jaw 67 are formed to protrude on the outer peripheral portion, it is difficult to perform die cutting in the axial direction. Must be split. In that case, the annular rib forming surface formed on the welding surface 64 of the flange becomes an undercut, but the annular rib that can be satisfactorily punched and can be well welded to the container main body can be formed as in the above embodiment. .

  Since the spout made of the synthetic resin of the present invention has a flange serving as a welding surface on the spout body, it can be easily welded to the container body as a spout of a container formed of a weldable packaging material. Since it can be satisfactorily attached to the container body so that no liquid leaks from the surface, it can be applied to any container equipped with a wrapping material that can be welded, and is particularly suitable for a paper container laminated with a synthetic resin film.

It is a front view of the spout which concerns on embodiment of this invention. It is the front longitudinal cross-sectional view. It is the bottom view. FIG. It is a die cutting progress figure which shows progress of die cutting of a flange. It is a partially broken front view of the cap with which a spout body is attached. It is a partially broken front view of the state assembled | attached by mounting | wearing with the cap shown in FIG. It is a partially broken front view which shows the state opened. It is a front longitudinal cross-sectional view of the spout which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,60 Spout 3,61 Spout main body 4 Cylindrical cutter 5 Connection bridge 6,15,66 Male screw 7,49 Ratchet tooth 8 Reinforcement rib 9 Cutter blade 11,62 Extraction cylinder 12,63 Flange 13 Ratchet claw 14,67 TE Band drop-off prevention jaw 16, 45 Female thread 20, 64 Welding surface 21 Annular rib 21-1 An innermost radial rib 21-2 Annular annular rib 21-3 An outermost radial rib 22 An upper surface 23 An inclined side Wall surface 24 Vertical wall surface 25, 65 Non-welding surface 30 Upper split type 31 Lower split type 40 Cap 41 Top wall 42 Skirt wall 43 TE band 44 Ratchet piece 47, 48 Stopper locking piece 70 Container body 71 Opening

Claims (4)

A synthetic resin spout comprising a flange that can be welded to a container body and a spout cylinder having a male screw that is screwed to a cap on an outer peripheral surface that extends upward from the inner peripheral edge of the flange. A plurality of annular ribs projecting concentrically on the side, the top surfaces of the plurality of annular ribs are located on substantially the same plane to form a main welding surface, and the inner side walls of the annular ribs extend from the top surface The annular rib that is inclined in the axial direction and that is radially innermost among the annular ribs has an inclined angle with respect to a horizontal plane perpendicular to the axis of the inclined sidewall surface to the outer side. A synthetic resin spout characterized in that the annular rib has a larger inclination angle with respect to a horizontal plane perpendicular to the axis of the inclined side wall surface . 2. The synthetic resin spout according to claim 1 , wherein the amount of protrusion of the annular rib located on the innermost side in the radial direction is larger than the amount of protrusion of the annular rib located on the outer side. The lower end via a connecting bridges breakable in a state in which the cylindrical cutter protrudes coaxially downward from the flange having a cutter blade, to claim 1 or 2, characterized in that it is integrally molded with the spout body The synthetic resin spout described. The surface of the flange opposite to the surface on which the annular rib is formed is an inclined surface outward so that the flange cross section gradually becomes thinner from the outer peripheral surface of the spout toward the outside. The synthetic resin spout according to any one of claims 1 to 3 .

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