JP2008297000A - Spout stopper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spout stopper comprising a dispensing cylinder attached to an opening part of a container filled with the content so as to form a flow passage for discharging the content, a closing plate for closing the dispensing cylinder, an annular score part arranged at the closing plate, a pull-ring placed inside the score part and connected to a location of the closing plate near the score part and a gas barrier film arranged at the surface of the closing plate at the container side, wherein when the pull-ring is pulled to open the opening, the gas barrier film is prevented from being left at the opening to avoid hinderance to dispensing of the content. <P>SOLUTION: A gas barrier film 8 is provided with a gas barrier layer 81, and the gas barrier layer 81 corresponds to a score part 41 and has a cut part 83 where a location of a connecting side 41a to which at least a pull-ring 7 is connected is cut. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a spout stopper provided with a gas barrier film.

  Conventionally, a spout stopper with a pull ring that is attached to an opening of a synthetic resin or paper container filled with contents such as dressing and has a gas barrier film is known (for example, see Patent Document 1).

  The spout stopper includes a pour cylinder portion that forms a flow path for pouring out the contents filled in the container, a blocking plate that closes the pour tube portion, and an annular score provided on the block plate. And a pull ring connected to a portion of the closing plate that is inside the score portion and adjacent to the score portion, and a gas barrier film provided on the container side surface of the closing plate.

However, when the conventional spout stopper pulls the pull ring to break the score portion and open the closing plate, the gas barrier film is not broken and the gas barrier film remains in the opening, which may hinder the dispensing of the contents. there were.
Japanese Utility Model Publication No. 4-106252

  In view of the above points, an object of the present invention is to provide a spout stopper capable of preventing the content barrier from being hindered by leaving a gas barrier film in the opening when the pull ring is pulled to be opened. .

  In order to achieve the above-mentioned object, the present invention provides a dispensing cylinder part that is attached to an opening of a container filled with contents and forms a flow path for dispensing the contents, and the dispensing cylinder part A closing plate provided on the closing plate, an annular score portion provided on the closing plate, a pull ring connected to a portion of the closing plate inside the score portion and adjacent to the score portion, In the spout stopper provided with the gas barrier film provided on the surface on the container side, the gas barrier film includes a gas barrier layer, and the gas barrier layer corresponds to the score portion and at least the portion on the connection side to which the pull ring is connected It has the cut | disconnected part cut | disconnected.

  When pulling the pull ring to break the score part and open the closing plate, the gas barrier film remains in the opening because the breaking strength of the gas barrier film is stronger than the adhesive strength between the gas barrier film and the closing plate, When pulling the pull ring, a tensile force is generated in a direction perpendicular to the bonding surface between the gas barrier film and the closing plate, which is considered to cause the gas barrier film and the closing plate to peel off.

  Therefore, it is considered that the gas barrier film can be prevented from remaining in the opening by making the adhesive force between the gas barrier film and the closing plate stronger than the breaking strength of the gas barrier film.

  However, the spout stopper is formed by placing a gas barrier film in the mold in advance and pouring the resin by injection molding. However, as a result of the experiment, the adhesive force between the gas barrier film and the closing plate cannot be reliably controlled. It has been found that it is difficult to make the adhesive force between the gas barrier film and the closing plate stronger than the breaking strength of the gas barrier film.

  Then, the inventors considered solving the above-mentioned problem from a viewpoint different from the viewpoint of improving the adhesive force between the gas barrier film and the closing plate.

  Here, as a result of experimenting how to apply the force from the start of breakage of the score part to the completion of breakage when pulling the pull ring to break the score part and opening the closing plate, the largest tensile force is required at the start of breakage I found out that In addition, the gas barrier layer having gas barrier properties originally has a property of high breaking strength.

  In the present invention, the gas barrier layer has a cut portion corresponding to the score portion and having at least a portion on the connection side cut. That is, the gas barrier layer that is hard to break is already cut when the score portion starts breaking when the pull portion is pulled to break the score portion and open the closing plate. It will be.

  Further, it was found as a result of experiments that the score portion can be broken with a smaller tensile force after the start of breaking the score portion than when the break start. That is, if the gas barrier film is ruptured at the start of rupture, the score portion is ruptured while being bent so that the inner portion of the score portion of the closing plate is lifted, so that the gas barrier film is smoothly Easy to break. Therefore, according to the present invention, the gas barrier film is not broken, and the remaining gas barrier film can be prevented from hindering the dispensing of the contents from the opening.

  Moreover, in this invention, since the cut part is formed in the site | part corresponding to the said score part of the said gas barrier layer, it is also considered that gas barrier property will fall large. Therefore, when the oxygen permeability of the spout stopper of the present invention was actually measured, it was found that the spout stopper of the present invention has a sufficient gas barrier property. This is because the area of the score part is very small compared to the area of the entire blockage plate, so even if the cut part is formed at a site corresponding to the score part of the gas barrier film, the amount of oxygen that permeates the cut part This is probably because there are few. Therefore, the present invention can improve the opening property of the closing plate and exhibit a sufficient gas barrier property.

  It is preferable that the cut part of the gas barrier layer is formed at least on the non-connecting side facing the connecting side at a site corresponding to the score part. As a result of experimenting how to apply the force from the start of breakage of the score part to the completion of breakage when pulling the pull ring to break the score part and opening the closing plate, it is smaller than the tensile force at the start of breakage It was found that a large tensile force was required upon completion of the break.

  This is because the score portion is smoothly broken while being bent so that the inner portion of the score portion of the closing plate is lifted during the break from the start of breakage of the score portion, whereas when the break is completed This is because the score portion is broken as it is stretched. When the score part is broken so as to be stretched, the gas barrier film is also broken so as to be stretched. At this time, a part of the gas barrier film is peeled off from the closing plate, and the peeled off gas barrier film tends to remain on the non-connected side portion of the opening edge of the closing plate.

  Therefore, as described above, if a cut portion is formed in a portion of the gas barrier layer of the gas barrier film corresponding to the score portion on the non-connecting side, the breakage of the score portion has already been completed. Since the gas barrier layer is cut, the gas barrier layer is not stretched and broken when the score portion is completely broken, and the peeled-off gas barrier film is prevented from remaining on the unconnected side of the opening edge. can do.

  It is preferable that the cut part of the gas barrier layer is formed over the entire part corresponding to the score part. When the score portion is broken by pulling the pull ring, if the cut portion is not formed in the gas barrier layer, the gas barrier layer is also broken. At this time, the gas barrier layer may be stretched and broken, and in this case, feathering may occur where the opening edge of the closing plate fluffs. Therefore, if configured as described above, since the gas barrier layer has already been cut when the score portion is broken, the opening edge of the closing plate is not stretched and broken. Generation of fuzzy feathering can be prevented.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing an embodiment of the spout stopper of the present invention, FIG. 2 is a cross-sectional view showing the state of the spout stopper of the embodiment of FIG. 1 taken along the line II-II, and FIG. FIG. 4 is a cross-sectional view showing a mold for molding the outlet plug, FIG. 4 is a cross-sectional view showing a state where the resin flows into the score portion when the spout plug of the embodiment is molded by the mold of FIG. 3, and FIG. It is sectional drawing which shows the state by which the cut part was formed in the gas barrier film of a spout stopper.

  As shown in FIGS. 1 and 2, the spout stopper 1 according to the embodiment of the present invention is made of polyethylene attached to the opening 2 a of the synthetic resin container 2, and the contents filled in the container 2. (Not shown in the figure) a flow path for pouring out, a pouring cylinder part 3 whose upper and lower ends are open, a closing plate 4 for closing the opening at the lower end of the pouring pipe part 3, and the pouring cylinder part 3 A projecting part 5 projecting radially outward from the lower end edge and a fitting part 6 hanging from the periphery of the projecting part 5 and fitted onto the opening 2a of the container 2 are provided.

  An elliptical annular score portion 41 is formed on the upper surface 4 a of the closing plate 4. A pull ring 7 is connected to the upper surface 4 a of the closing plate 4 via a connecting portion 71 so as to be positioned inside the score portion 41 and adjacent to one side in the longitudinal direction of the score portion 41. A gas barrier film 8 is provided on the lower surface 4 b (surface on the container side) of the closing plate 4.

  The gas barrier film 8 includes a gas barrier layer 81 made of an ethylene-vinyl alcohol copolymer (EVOH), and is formed by adhering a polyethylene layer 82 on both sides of the gas barrier layer 81, and has a thickness of 40 μm and is not stretched. A thing was used. The gas barrier film 8 includes a cutting portion 83 that is cut over the entire position where the score portion 41 is formed.

  Next, the manufacturing method of the spout stopper 1 of embodiment is demonstrated with reference to FIGS.

  First, as shown in FIG. 3, the gas barrier film 8 is disposed on the lower mold 91 of the injection molding machine. Then, the upper mold 92 is lowered to form the cavity 93. At this time, the interval d from the score molding part 92a for molding the score part 41 of the upper mold 92 to the upper surface of the lower mold 91 is set so that the polyethylene injected into the cavity 93 is cooled and contracted. The thickness is determined and set from the shrinkage rate of polyethylene so that the thickness is 0.20 mm. Then, polyethylene is injected from the gate 92b into the cavity 93 at an injection temperature of 210 ° C., and the spout stopper 1 is molded.

  At this time, as shown in FIG. 4, polyethylene flows between the score molding part 92a and the upper surface of the lower mold 91, and a cut part 83 is formed in the gas barrier film 8 as shown in FIG. This is presumably because the pressure and temperature rise due to a sudden narrowing of the flow path when polyethylene flows, and the gas barrier film 8 is broken.

  The cross section of the score portion 41 of the spout plug 1 manufactured in this way was confirmed with a microscope at four locations on the score portion 41 at both ends in the longitudinal direction and both ends in the short direction. At this time, the gas barrier layer 81 was colored and confirmed so that it could be easily confirmed whether or not the gas barrier layer 81 was cut. As a result, it has been found that the gas barrier film 8 has cut portions 83 formed at all four locations. From this, it is estimated that the cutting part 83 is formed over the whole part of the gas barrier film 8 corresponding to the score part 41.

  Conventionally, it has been considered that a lot of oxygen permeates through the score portion 41 which is the thinnest portion of the spout stopper. Therefore, it is considered that the gas barrier property may be greatly impaired when the cut portion 83 is formed in a portion corresponding to the score portion 41 of the gas barrier film 8. However, as a result of actually measuring the oxygen permeability of the spout stopper 1 of the embodiment, it was found to be 0.004 to 0.005 cc / day (permeation amount per day).

  When the oxygen transmission rate of the spout stopper using aluminum as the gas barrier film (the gas barrier film has no cut portion) was measured to be 0.003 to 0.004 cc / day, the spout stopper 1 of the embodiment is sufficient. It turns out that it has gas barrier properties. This is presumably because the area where the cutting part 83 is formed is very small compared to the area of the closing plate 4.

  As a comparative example, the interval d was set so that the thickness of the score portion was 0.24 mm, and the spout plug was manufactured under the same conditions as the rest. As a result, no cut portion was formed in the gas barrier film. In the spout plug of this comparative example, when the score portion is broken to open the closing plate, the gas barrier film peels off from the closing plate without breaking at the portion corresponding to the score portion, and the opening is closed. It has been found that the frequency of occurrences is high.

  Table 1 shows the experimental results when the spout body was manufactured by changing the injection temperature and the thickness of the score portion. In addition, since the spout body was burnt at an injection temperature of 240 ° C. or higher, the experiment was conducted at an injection temperature of 230 ° C. or lower. Further, since the pinhole is generated in the score portion when the thickness of the score portion is 0.17 mm or less, the experiment was performed by setting the interval d so that the thickness of the score portion was 0.18 mm or more.

  As can be seen from Table 1, when the injection temperature is 190 ° C. or lower, the cut portion 83 is not formed even when the thickness of the score portion is 0.18 mm, and the gas barrier film remains in the opening. Therefore, in order to form the cut part 83 in the gas barrier film 8, it is necessary that the injection temperature is 200 ° C. to 230 ° C. and the thickness of the score part is 0.18 mm to 0.23 mm. I understand.

  From the above, it can be seen that the formation position of the cutting portion 83 can be set by adjusting the interval d within the range of the injection temperature of 200 ° C. to 230 ° C. For example, when the cutting part 83 is formed only in the part of the gas barrier film 8 corresponding to the connection side 41a and the non-connection side 41b of the score part 41 and the cutting part 83 is not formed in the other part, the injection temperature is 200 ° C. Within the range of ˜230 ° C., the interval d between the portions corresponding to the connecting side 41a and the non-connecting side 41b is set so that the thickness of the score portion is 0.18 mm to 0.23 mm, and the interval d between other portions Can be formed by setting the thickness of the score part to be 0.24 mm or more.

  According to the spout plug 1 of the embodiment, since the cut portion 83 is formed in the gas barrier film 8 at the score portion 41, when pulling the pull ring 7 to break the score portion 41 and opening the closing plate 4 In addition, it is possible to prevent the gas barrier film 8 from being clogged without being broken as in the prior art, and to improve the openability. Moreover, since the cutting part 83 is very small compared with the area of the gas barrier film 8, sufficient gas barrier property can be exhibited.

  Further, when the score portion 41 is broken by pulling the pull ring 7, if the cut portion 83 is not formed in the gas barrier layer 81, the gas barrier layer 81 is also broken. At this time, there is a possibility that the gas barrier layer 81 is stretched and broken, and in this case, there is a possibility that feathering in which the opening edge of the closing plate 4 fuzzs may occur.

  According to the spout plug 1 of the embodiment, since the gas barrier layer 81 has already been cut by forming the cutting portion 83 when the score portion 41 is broken, the score portion 41 is broken to close the closing plate 4. It is possible to prevent the occurrence of feathering in which the opening edge fluffs when opened.

  In addition, in the spout stopper 1 of the embodiment, the cutting part 83 formed in the gas barrier film 8 is illustrated and described as completely cutting the gas barrier film 8, but the cutting part 83 cuts at least the gas barrier layer 81. What is necessary is just to be formed. This is because the gas barrier layer 81 having a gas barrier property is provided with the property of being hardly broken, among the score portion 41 and the portion of the gas barrier film 8 corresponding to the score portion 41.

  In the embodiment, the gas barrier film 8 having the cut portion 83 formed over the entire portion corresponding to the score portion 41 has been described. However, the cut portion 83 is formed on the connecting side 41a on which the connecting portion 71 is formed. You may form only in the site | part of the gas barrier film 8 corresponding to the score part 41 or the non-connection side 41b facing the connection side 41a. In this case, within the range of the injection temperature of 200 ° C. to 230 ° C., the thickness of the score portion on the connection side 41a or the non-connection side 41b is set to 0.18 mm to 0.23 mm, and the thickness of the score portion of other portions is set to 0. It can manufacture by setting it as 24 mm or more.

  As a result of measuring the change in tensile force from the start of breakage of the score portion 41 to the completion of breakage when the pulling ring 7 is pulled to break the score portion 41 and open the closing plate 4, breakage that breaks the connecting side 41a of the score portion 41 It was found that the tensile force at the start was the highest, and then the tensile force at the time of completion of breaking to break the unconnected side 41b of the score portion 41 was high.

  And when breaking the score part 41, the direction of the tensile force at the time of the break start becomes a direction perpendicular to the surface of the gas barrier film 8. Therefore, the gas barrier film 8 is most easily peeled off from the closing plate 4 at the start of rupture. Therefore, if the cutting part 83 is formed at least on the connection side 41a, the gas barrier film 8 is already cut by the cutting part 83 on the connection side 41a at the start of breaking, so that the gas barrier film 8 is peeled off from the closing plate 4. Can be suppressed.

  Further, when the breaking of the score portion 41 is completed, since most of the score portion 41 is in a broken state, the portion located inside the score portion 41 of the closing plate 4 is pulled out by pulling the pull ring 7. It is in a state parallel to the axial direction of the portion 3, and the portion on the non-connecting side 41 b of the score portion 41 is broken so as to be extended, and the breaking of the score portion 41 is completed.

  Therefore, when the cut portion 83 is not formed on the non-connected side 41b, the gas barrier film corresponding to the non-connected side of the score portion is also broken so as to be stretched. Is peeled off, and the peeled gas barrier film tends to remain on the non-connected side of the opening edge of the closing plate. Therefore, if the cutting portion 83 is formed at least in the portion of the gas barrier film 8 corresponding to the non-connecting side 41b of the score portion 41, when the cutting is completed, the gas barrier film 8 has already been cut by the cutting portion 83. It is possible to prevent the peeled gas barrier film from remaining on the unconnected side 41b of the opening edge.

  Moreover, although the spout stopper 1 was shape | molded with polyethylene in embodiment, you may use another resin. In the embodiment, the gas barrier film 8 is obtained by sandwiching an EVOH gas barrier layer 81 between polyethylene resin layers, but other resin gas barrier films may be used as long as they have gas barrier properties. Good.

  Moreover, although embodiment demonstrated the spout stopper 1 attached to the synthetic resin container 2, it is not restricted to this, For example, the container 2 may be glass or paper. When a paper container is used, the spout stopper 1 may be attached to the container by adhesion or the like.

  In the embodiment, the score portion 41 has an elliptical annular shape. However, the present invention is not limited to this. For example, the score portion 41 may be formed in a cross-shaped annular shape.

The top view which shows embodiment of the spout stopper of this invention. Sectional drawing which shows the state which cut | disconnected the II-II line | wire of the spout stopper of embodiment of FIG. Sectional drawing which shows the metal mold | die which shape | molds the spout stopper of embodiment. Sectional drawing which shows the state into which resin flows into a score part, when shape | molding the spout stopper of embodiment with the metal mold | die of FIG. Sectional drawing which shows the state by which the cut part was formed in the gas barrier film of the spout stopper of embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Spout stopper, 2 ... Container, 2a ... Opening part, 3 ... Dispensing cylinder part, 4 ... Closure board, 4a ... Upper surface, 4b ... Lower surface (surface on the container side), 41 ... Score part, 41a ... Connection side 41b ... non-connecting side, 5 ... overhanging part, 6 ... fitting part, 7 ... pull ring, 71 ... connecting part, 8 ... gas barrier film, 81 ... gas barrier layer, 82 ... resin layer, 83 ... cutting part, 91 ... Lower mold, 92 ... Upper mold, 92a ... Score molding part, 92b ... Gate, 93 ... Cavity.

Claims (3)

An extraction cylinder part that is attached to an opening of a container filled with contents and forms a flow path for pouring the contents; a closing plate that closes the extraction cylinder part; and An annular score portion provided, a pull ring connected to a portion of the closing plate that is inside the score portion and adjacent to the score portion, and a gas barrier film provided on the surface of the closing plate on the container side In the spout stopper provided with
The gas barrier film includes a gas barrier layer,
The gas barrier layer has a spout plug corresponding to the score portion and having a cut portion cut at least at a connection side where the pull ring is connected.   The spout stopper according to claim 1, wherein the cut portion of the gas barrier layer is formed at least on a non-connection side facing the connection side at a portion corresponding to the score portion.   The spout plug according to claim 1, wherein the cut portion of the gas barrier layer is formed over the entire portion corresponding to the score portion.

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