JP4685210B2 - Resin cap with resin pad - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin cap provided with a resin pad on the inner surface of the top surface portion, and more specifically, it eliminates defects such as protrusion to the outside of the sealing portion of the resin pad and insufficient coverage of the resin pad, In addition, the present invention relates to a resin cap with a pad with improved moldability and cap quality, and more particularly to a resin cap for prizes.
[0002]
[Prior art]
A resin cap having a resin cap body provided with a top surface portion and a skirt portion and a container pad sealing resin pad formed on the inner surface of the top surface portion by press molding of resin has been known for a long time. .
[0003]
For example, in Japanese Patent Application Laid-Open No. Sho 62-122964, in the resin cap provided with the liner formed by the above-described press molding, a plurality of mutually separated protrusions are integrally projected on the inner surface of the top surface portion, A container lid having a liner engaged with a protrusion is disclosed.
[0004]
In addition, in Japanese Patent Publication No. 2-44699 of the applicant's application, at the time of manufacturing a similar resin cap with a liner, at least one projection having a projection height larger than the thickness of the liner is provided on the top surface portion. It is described that a liner material is supplied to the central portion of the top surface portion to cause the projection to enter the liner material, and the tip of the projection is pushed and expanded at the stage of pressing the liner.
[0005]
It is also known to apply the above-mentioned resin cap with liner to a prize cap. For example, in Japanese Utility Model Publication No. 7-16629, a synthetic resin made of a top plate portion and a skirt portion hanging from the periphery thereof is disclosed. A mark is marked on the inner surface of the top plate portion of the cap body, and is in close contact with the marked portion on the inner surface of the top plate portion, and is formed so as to protrude downward at the peripheral portion of the top plate portion. A cap with a hidden display mark is provided, characterized in that a liner locked and held by a stop projection is provided.
[0006]
[Problems to be solved by the invention]
The resin cap found in the above prior art is to apply a resin pad separate from the resin cap body as a liner for sealing the container mouth, and its purpose is to increase the engagement force between the liner and the cap body. This prevents the liner from falling off.
[0007]
In recent years, with the improvement of the resin material for cap molding and the improvement of the sealing structure, an excellent sealing performance can be obtained even with a so-called one-piece structure resin cap in which the sealing portion is formed integrally with the top surface portion.
Nevertheless, there is a case where it is necessary to apply a resin pad separately from the resin cap body. As such an example, a concealed cover of a prize mark applied to the inner surface of the top face part of the prize cap, the top part Application of the oxygen-absorbing resin composition to the inner side from the sealed portion on the inner surface is exemplified.
[0008]
However, according to the prototype research by the present inventors, when the resin pad is formed by press molding inside the sealing portion of the inner surface of the top surface portion of the cap body, the resin pad protrudes to the outside or the resin pad Defects such as insufficient pad coating often occur, and this defect was found to be particularly noticeable in caps that require peelability between the resin pad and the inner surface of the top surface, such as a resin cap for prizes. .
Moreover, when such a defect occurs, not only the appearance characteristics and commercial value of the cap deteriorate, but also the cap sealing performance and various performances as a cap are adversely affected.
[0009]
The resin pad is formed in the cap by supplying a lump of molten resin to the inner surface side of the resin cap body and pressing it with a mold.
The resin pad is generally molded while the cap revolves with a rotary molding machine. For this reason, the molten resin lump supplied in the cap body rolls in the cap, the position of the molten resin is greatly shifted from the center, and the resin tends to protrude from the set position, which causes the above-described defects. It is accepted.
[0010]
Therefore, the object of the present invention is to eliminate defects such as the protrusion of the resin pad to the outside and the insufficient covering of the resin pad in the resin cap provided with the resin cap body and the resin pad, An object of the present invention is to provide a resin cap with a resin pad that is excellent in appearance characteristics and commercial value of a cap, and has excellent sealing performance and various performances as a cap.
Another object of the present invention is that a resin pad is provided on the inner side of the sealing portion on the inner surface of the top surface so as to conceal the prize mark, and the resin pad can be peeled off from the top surface with the prize mark transferred. The present invention provides a resin cap with a resin pad for prizes.
[0011]
[Means for Solving the Problems]
According to the present invention, in a resin cap provided with a resin cap body having a top surface portion and a skirt portion, and a resin pad formed by resin molding on the inner surface of the top surface portion, the resin cap body is a top surface. It has a sealing portion formed integrally with the inner surface of the surface portion, and the resin pad is formed on the inner side of the sealing portion on the inner surface of the top surface portion of the cap body, and on the inner side of the sealing portion on the inner surface of the top surface portion. Multiple fine protrusions smaller than the thickness of the resin pad And a prize mark is formed. Formed in the thickness direction of the resin pad. ,And It is distributed around the circumference And Many concentrically arranged In addition, the resin pad and the inner surface of the top surface portion are detachably coupled via the fine protrusions. A resin cap provided with a resin pad is provided.
In the resin cap of the present invention,
1. The resin pad has an annular rim having a larger thickness than the other parts at the periphery,
2. An annular groove is formed in the radially inner peripheral edge of the sealing portion of the inner surface of the top surface portion, and the resin pad is applied from the part of the annular groove toward the radially inner side,
Is preferred.
The present invention can be applied particularly advantageously to a resin cap for prizes. In this case, the cap body is composed of convex portions and / or concave portions in addition to fine protrusions. Said Has a sweepstakes mark ,in front The resin pad is on the inner surface of the top surface. Said It is preferable that the prize mark is peeled off after being transferred.
The resin pad is preferably provided with a peeling start knob extending in the vertical direction at the center thereof. The resin cap of the present invention can be applied to an oxygen-absorbing resin cap. In this case, the resin pad can be composed of a resin composition containing an oxygen absorbent.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
[Action]
The present invention relates to a resin cap comprising a resin cap body provided with a top surface portion and a skirt portion, and a resin pad formed by pressing the resin on the inner surface of the top surface portion.
(1) The resin cap body has a sealing part integrally formed with the inner surface of the top surface part,
(2) The resin pad is formed inside the sealing part of the inner surface of the top surface of the cap body,
as well as
(3) A plurality of fine protrusions smaller than the thickness of the resin pad are formed in the thickness direction of the resin pad inside the sealing portion of the inner surface of the top surface portion.
It has a feature in the combination.
[0013]
In the present invention, a sealing portion is formed integrally with the inner surface of the top surface portion, and the bottle mouth portion is sealed by this sealing portion. In this way, by forming the sealing part integrally with the resin cap body, it becomes possible to form a highly accurate sealing part and improve the sealing performance of the cap, compared to the case of pressing the liner separately. Can be made.
[0014]
In the present invention, in connection with the fact that the sealing portion is formed integrally with the resin cap body, the concealing coating of the prize mark or the resin pad for imparting oxygen absorption is provided inside the sealing portion on the inner surface of the top surface portion. Provide.
Thus, providing the resin pad inside the sealing portion provides several advantages in terms of cap performance.
[0015]
When a bottled beverage is sold with a prize, it is exchanged when the purchaser of the bottled goods mails a predetermined number of liners, etc. or a liner that is clearly a winning ticket, or brings it to the store. A system for delivering or handing out prizes is generally employed, and this system is similarly applied to a resin pad.
When the resin pad according to the present invention is used as a concealment coating for a prize mark, the first purpose is to make the prize mark invisible from the outside in a state where the cap is sealed. It is a second object to peel off the resin pad when it is opened so that it can be easily confirmed whether or not it is a winning ticket.
In the cap of the present invention, the resin pad is provided on the inner side of the sealing portion, and the sealing portion integral with the resin cap body remains even after the resin pad is peeled off, so that the reseal after opening is ensured. And the advantage of being easily done is achieved.
[0016]
On the other hand, in the case of an oxygen-absorbing resin pad, the resin pad provided on the inner surface side of the sealing portion contacts the head space in the bottle, absorbs oxygen in the bottle, and suppresses oxidative deterioration of the contents. It is useful for maintaining flavor.
By the way, oxygen absorbers such as reduced iron powder contained in the oxygen-absorbing resin pad are hard in nature and lack cushioning properties. The cap of the present invention has a resin pad provided on the inner side of the sealing portion, so that the advantage that oxygen absorption performance can be expressed without impairing the sealing performance is also achieved. is there.
[0017]
In the present invention, it is a remarkable feature that a plurality of fine protrusions smaller than the thickness of the resin pad are formed in the thickness direction of the resin pad inside the sealing portion of the inner surface of the top surface portion to which the resin pad is applied, Defects such as protrusion of the pad to the sealing portion and the like, and insufficient coating of the resin pad can be eliminated, and the appearance characteristics and commercial value of the cap can be improved.
[0018]
See the examples below. That is, when the resin pad is molded on the resin cap body similar to the present invention except that the fine protrusion is not formed on the inner surface of the top surface portion inside the sealing portion, the molding defect rate of the resin pad reaches about 30%. On the other hand, according to the present invention, when the fine protrusion is formed on the inner surface of the top surface portion inside the sealing portion, the molding defect rate of the resin pad can be suppressed to zero.
[0019]
As already pointed out, the resin pad is molded by using a rotary molding machine to supply a lump of molten resin to the inner surface side of the revolving plastic cap body and pressing it with a mold in the cap. It is formed. At this time, the molten resin lump supplied into the cap body rolls in the cap, and the position of the molten resin is greatly shifted from the center, and the resin protrudes from the set position, or conversely, the coating is insufficient. It is recognized that this leads to the aforementioned defects.
In particular, this tendency is also greatly influenced by the adhesive force between the resin cap body and the resin pad, and as in the case of the resin pad used for the concealment mark concealment coating, peelability is required between the top surface inner surface and the resin pad. In such a resin pad, the degree of rolling of the molten resin lump increases, and the tendency to generate defects such as protrusion and insufficient coating is more remarkable.
[0020]
In the present invention, the reason why the defect is eliminated by providing the fine protrusion on the inner surface of the top surface portion is that the molten resin flows around the plurality of fine protrusions provided on the inner surface of the top surface portion, It is considered that the resisting force due to this engagement prevents misalignment due to rolling of the molten resin lump.
[0021]
The present invention can be applied particularly advantageously to a resin cap for prizes. In this case, the cap body has a prize mark composed of a convex part and / or a concave part in addition to the fine protrusion, and the resin pad and the inner surface of the top surface part. Are preferably detachably coupled via the fine protrusions, and the resin pad is preferably peeled off in a state where the prize mark on the inner surface of the top surface portion is transferred. The resin pad is preferably provided with a peeling start knob extending in the vertical direction at the center thereof.
[0022]
In this prize cap, the molded resin pad and the inner surface of the top surface of the resin cap body are engaged via the fine protrusions, so that the resin pad can be joined to the extent that accidental detachment of the resin pad can be prevented. In addition to being strengthened, this engagement is also made through fine protrusions, so that it is not strong enough to prevent peeling by a finger, and there is an advantage that peeling is easily performed.
[0023]
The fine protrusions in the resin cap for a prize of the present invention can have any shape such as a cone, a pyramid, a frustum, a cylinder, or a prism, but in terms of easy peeling, a cone, It is preferable to have a divergent form toward the top surface such as a pyramid shape or a truncated cone shape.
[0024]
The height (H) of the fine protrusions on the top surface portion of the cap body is smaller than the thickness of the resin pad, but generally it is preferable to have a height of 0.1 to 1.0 mm. The bottom area is generally 0.1 to 5.0 mm ² It is preferable that it exists in the range.
On the other hand, the thickness (T) of the portion corresponding to the fine protrusion of the resin pad is generally 0.3 to 1.5 mm, and the ratio (H / T) between the height of the protrusion and the thickness of the pad is 0.3 or more. It is preferably less than 1.0, particularly in the range of 0.4 to 0.7.
If this ratio (H / T) is smaller than the above range, when molding the resin pad, the effect of preventing molding defects due to rolling of the molten resin lump tends to be lower than that in the above range, On the other hand, if it is larger than the above range, the stress required for peeling off the resin pad increases, and the peelability with the finger falls as compared with the case where it is within the above range.
[0025]
In addition, the fine protrusion has a resin pad area of 1 cm. ² In general, it is preferable to provide a density of 4 to 80, especially 4 to 60, on the basis of the hit, in order to prevent molding defects of the resin pad. That is, when the density is lower than the above range, the frequency of occurrence of molding defects tends to increase as compared with the case where the density is within the above range. On the other hand, there is no particular advantage even if the density exceeds the above range. This is disadvantageous in that the resistance increases.
[0026]
The fine protrusions are preferably provided uniformly on the surface of the top surface portion to which the resin pad is applied. As will be described later, when a concave or convex part for forming a prize mark is formed on the inner surface of the top surface part, fine protrusions are uniformly formed on the part excluding the concave or convex part for forming the prize mark. It is desirable.
In general, in terms of ease of formation of fine protrusions and effective prevention of molding defects due to rolling of the resin, it is preferable that the fine protrusions are distributed in a circumferential shape, and in particular, a large number of concentric circles are provided. Is most preferred.
[0027]
The resin cap for prizes according to the present invention is provided with a peeling start knob extending in the height direction at the center of the resin pad, or further, a peeling tab partitioned by slits or scores in the vicinity of the knob. Is preferably formed.
When the knob is pushed down with a finger, the base of the knob serves as a fulcrum to start peeling of the resin pad, and subsequent peeling of the resin pad is easily performed. That is, the resin pad is peeled off with the largest stress at the start of peeling, but when the knob is pushed down, there is an advantage that it is performed with a relatively small stress. In addition, when a tab for separation separated by a slit or a score is formed in the vicinity of this knob, the tab is peeled off by gripping and pulling up the knob after the knob is pushed down, and the resin thereafter. The peeling of the pad proceeds easily.
[0028]
In the cap of the present invention, it is preferable to transfer the prize mark to the resin pad on the side in contact with the inner surface of the top surface in order to prevent the prize mark from being seen outside before opening the bottled product. . In particular, if a concave or convex part for forming a prize mark is formed on the inner surface of the top surface inside the sealed part, the prize mark is formed as a convex or concave part on the corresponding surface of the resin pad when molding the resin pad. Therefore, it is preferable.
[0029]
【Example】
The invention will be further described with reference to the embodiments shown in the accompanying drawings.
In the accompanying drawings,
FIG. 1 is a cross-sectional view of an example of a resin cap body used in the present invention.
2 is a bottom view of the resin cap body of FIG.
FIG. 3 is a cross-sectional view showing a state where the molten resin mass is supplied to the resin cap body of FIG.
FIG. 4 is a bottom view of the resin cap body supplied with the molten resin lump of FIG.
FIG. 5 is a cross-sectional view of an example of a resin cap with a resin pad according to the present invention,
6 is a bottom view of the resin cap with a resin pad of FIG.
FIG. 7 is an enlarged partial cross-sectional side view showing the resin cap with a resin pad of FIG. 5 together with the container mouth part,
FIG. 8 is a cross-sectional view of another example of a resin cap with a resin pad according to the present invention,
9 is a bottom view of the resin cap with a resin pad of FIG.
FIG. 10 is an enlarged partial cross-sectional side view showing the resin cap with a resin pad of FIG. 8 together with the container mouth part,
FIG. 11 is a process diagram for explaining a resin pad molding process,
FIG. 12 is a cross-sectional view of still another example of the resin cap with a resin pad of the present invention,
FIG. 13 is a bottom view of the resin cap with a resin pad of FIG.
FIG. 14 is a cross-sectional view of a resin cap with a resin pad manufactured using a resin cap body in which fine projections are not provided on the inner surface of the top surface portion.
FIG. 15 is a bottom view of the resin cap with a resin pad of FIG.
[0030]
[Example 1]
The cap main body 1 of the present embodiment shown in FIGS. 1 to 7 includes a top surface portion 2, a skirt portion 3 suspended from the peripheral portion of the top surface portion, and a tamper-evidence band (circumferential band) 4.
A sealing portion is formed integrally with the inner surface of the top surface portion 2, and this sealing portion includes an inner ring 21 to be inserted into the bottle mouth portion, an outer ring 22 provided on the outer side thereof, and a top portion of the bottle mouth portion. And a contact ring 23 that contacts with the inner surface.
In the cap of this specific example, the inner ring 21 guides the bottle neck 6 (FIG. 7) to be sealed so that the cap is correctly centered, and the inner ring 21 itself is connected to the bottle mouth inner peripheral surface 64 (FIG. 7). The sealing engagement is performed between them. The outer ring 22 correctly positions the outer peripheral edge of the bottle mouth part 62 (FIG. 7), and in this state, the contact ring 23 and the bottle mouth outer periphery corner part are hermetically engaged.
In this type of sealing structure, even if the top surface of the cap undergoes paneling deformation in the upward or downward direction, the sealing position does not change or if there is any fluctuation, the fluctuation is small and the sealing performance is particularly excellent. In particular, the contact ring 23 is effective in preventing leakage due to accumulated pressure.
Of course, the sealing engagement method is not limited to the above-described method, and the sealing engagement may be performed between the outer ring 23 and the bottle mouth outer peripheral surface.
[0031]
A screw thread 31 for opening and closing is provided on the inner surface of the skirt portion 3, and the cap is fastened to the bottle neck portion 6 by engagement with the screw 61 (FIG. 7) of the bottle neck portion. A knurled groove 32 is formed on the outer surface of the skirt portion 3 so that the cap 1 can be easily held.
[0032]
The circumferential band 4 is disposed on the lower side of the skirt portion 3, and a breakable bridge in which a plurality of upper end surfaces of the circumferential band 4 and lower end surfaces of the skirt portion 3 are provided at appropriate intervals in the circumferential direction. 5 are connected. More specifically, the inner surface of the bridge 5 is formed to extend downward so as to be flush with the inner surface of the skat portion 3, while the portion other than the bridge 5 is formed to be recessed radially outward. ing. The bridge 5 is maintained as it is when the cap is closed, and is cut when the cap is opened so that the cap can be turned.
In the cap of this specific example, the circumferential band 4 and the skirt portion 3 are integrally formed by means such as injection molding or compression molding. However, after the molding, an annular cut 51 is formed by a cutter or the like, and other than the bridge 5 By cutting this portion, the circumferential band 4 and the skirt portion 3 are separated.
[0033]
In the lower part of the skirt portion 3, a portion having a slightly increased outer diameter, particularly a tapered portion 33, is formed toward the circumferential band 4, and a space for forming the bridge 5 is secured below this portion. Similarly, the outer surface of the circumferential band 4 is a tapered surface whose diameter increases downward.
[0034]
A step portion 34 is formed on the lower inner surface side of the skirt portion 3, and the bridge 5 extends from the lower surface side of the step portion to the circumferential band 4 side to improve moldability such as die cutting.
As already described, the cap body 1 and the circumferential band 4 are divided by the annular cutting surface 51, but it will be understood that the bridge 5 is located inside the annular cutting surface 51.
[0035]
The circumferential band 4 is provided with a large number of foldable flap pieces 41 extending radially inward and obliquely upward for locking to the container mouth. In this specific example, four flap pieces are arranged in a circumferential shape, and a notch portion 42 for facilitating folding of the flap pieces up and down is provided at an intermediate position in the circumferential direction of each flap piece 41. Is provided.
The flap piece 41 includes a base portion 43 having a small thickness projecting radially inward from the inner surface of the skirt portion and a tip portion 44 having a relatively large thickness. The notch portion 42 described above has a thick tip. It is formed so as to reach the root portion from the portion 44 in the radially outward direction.
Since the flap piece 41 is provided through the thin base portion 43, the flap piece 41 can be freely bent and bent in the vertical direction, and the closing operation can proceed smoothly without damaging the bridge. Further, since the tip end portion 44 is provided thick, it engages along the lower surface of the locking jaw portion 65 (see FIG. 7) of the container, and the locking of the flap piece 41 causes buckling. It is done stably without any problems. At the time of opening, the engagement between the distal end portion 44 and the container locking jaw portion 65 prevents the circumferential band 4 from being lifted, and the bridge is broken.
The flap piece 41 is formed in a state oriented in the radially inward direction and obliquely downward, but is used for capping the container mouth in a state reversed in the upward direction shown in FIG.
[0036]
In addition, the lower end edge 45 of the circumferential band 4 is formed to be relatively thick, and the lower end edge 45 is close to the support ring 63 below the container mouth portion when closed to prevent unauthorized opening by inserting an instrument or the like. It is to prevent.
[0037]
In the present invention, a resin pad 10 is provided on the inner surface of the top surface portion 2 and inside the sealing portion (inner ring) 21 as a whole. The resin pad 10 of this embodiment is used for concealing a prize mark.
[0038]
On the inner surface of the top surface portion 2 and on the inner side of the sealing portion (inner ring) 21, a prize mark 25 is stamped as a concave pattern, for example.
A large number of fine protrusions 26 are circumferentially distributed on the inner surface of the top surface portion inside the sealing portion. In the cap shown in this embodiment, it is distributed in a concentric manner over four circumferences.
The size, shape, and distribution density of the fine protrusions 26 are as already pointed out.
[0039]
As shown in FIGS. 3 and 4, the resin pad 10 is molded in the inverted state of the cap, that is, in the state where the top surface portion 2 is on the lower side, and the top surface portion 2 on which the prize mark 25 and the numerous fine protrusions 26 are formed. It is formed by supplying the molten resin lump 7 to the inner surface of the resin and embossing it in the resin cap body 1. This embossing means will be described in detail later.
In the present invention, by providing a large number of fine protrusions 26 on the inner surface of the top surface portion, the molten resin mass 7 is prevented from rolling on the inner surface of the top surface portion. As shown in FIGS. The resin pad 10 having a predetermined shape can be molded in an accurately positioned state without such disadvantages.
[0040]
In FIG. 5 to FIG. 7 showing the molded resin pad 10 together with the resin cap body 1, a peeling start knob 12 extending in the height direction is provided at the center of the flat plate portion 11 of the resin pad 10. Further, an inverted U-shaped slit or score 13 is formed so as to be close to and surround the knob 12, and a peeling tab 14 partitioned by the slit or score is formed.
In this specific example, one end portion of the slit or score 13 extends to the outer periphery of the flat plate portion 11, but the other end portion of the slit or score 13 is a thickness provided between the center portion and the outer periphery of the flat plate portion. It is surrounded by the meat ribs 15 so that cutting to the tip does not proceed.
A mark 16 indicating the direction in which the peeling start knob 12 is pushed down is also formed on the flat plate portion 11 of the resin pad 10.
[0041]
In this specification, the slit means that the line dividing the tab 14 and the other flat plate part 11 is completely cut so as to reach the inner surface of the top surface part, while the score means this section. It means that the line is weakened so that breakage easily occurs along the line.
On the other hand, the knob 12 is pushed into the direction in which the tab 14 is peeled off (in the direction of the arrow 16 in FIG. 6) with a fingertip or a nail, so that the knob 12 becomes a kind of lever, The peeling at the interface with the resin pad proceeds easily.
The shape of the knob 12 may be any shape such as a cylindrical shape, a semi-cylindrical shape, and a prismatic shape, but it is desirable to have a truncated conical shape from the viewpoint of molding workability (releasability).
Moreover, the peeling tab 14 should just be what can peel in the resin pad center part with a comparatively short width | variety. Thus, the line 13 that divides the peeling tab 14 may take any form such as a V-shape, a U-shape, an S-shape, and a Z-shape in addition to the U-shape.
[0042]
On the other hand, in FIG. 7 showing the bottle neck portion 6 to which the cap of this embodiment is fastened, a screw 61 that can be engaged with the screw 31 of the cap is formed on the outer peripheral surface of the bottle neck portion 6 and sealed with the cap. The mouth portion 62 and the inner peripheral surface 64 are provided. A support ring 63 for supporting the bottle when filling the contents and closing the cap is also formed at the lower portion of the neck portion 6.
Further, a jaw portion 65 for engaging the circumferential band of the cap is also formed between the screw 61 and the support ring 63.
[0043]
When the cap is fastened to the container mouth, when the cap 1 with a resin pad shown in FIG. 5 is rotated in the closing direction, it rotates in the closing direction while maintaining the integrity of the circumferential band 4 and the cap body 1. By the action of the flap piece 41 described previously, the circumferential band 4 and the cap body 1 can be fastened to the container mouth.
In the closed state shown in FIG. 7, the inner ring 21 of the cap is sealingly engaged with the inner peripheral surface 64 of the container mouth part, and the contact ring 23 is sealingly engaged with the top part of the container mouth part to perform sealing and holding, Moreover, the flap piece front-end | tip part 44 of the circumferential band 4 is located in the form along the lower surface of the container jaw part 65, and holding | maintenance of the circumferential band 4 is performed.
[0044]
When opening the cap, when the cap 1 is rotated in the opening direction, the skirt portion 3 rises along the screw, but the flap piece front end portion 44 and the container jaw portion 65 are engaged, and the circumferential band 4 Since the ascent is prevented, the bridge 5 is cut and the cap is opened.
[0045]
After opening the cap, the peeling start knob 12 can be pushed down in the direction of peeling the tab 14 to start peeling the tab 14 and peel the entire resin pad 10. Since the prize mark engraved on the inner surface of the top surface is transferred to the back surface of the resin pad 10, a predetermined number of resin pads 10 peeled off from the cap or a resin pad 10 that is clearly a winning lot is mailed or You can bring it to the store and receive prizes in exchange.
[0046]
[Example 2]
The basic structure of the cap of the second embodiment shown in FIGS. 8 to 10 is almost the same as that of the first embodiment, and is the same as that of the first embodiment except the points described below. Should be understood.
In the cap of this embodiment, the inner surface of the inner ring 21 is substantially straight, and the inner ring 21 is rather provided with a function as a guide for correctly performing the centering, and the outer ring 22 and the bottle mouth portion outer peripheral surface And a sealing engagement between the contact ring 23 and the top of the bottle mouth 62.
Further, in the cap of this specific example, the missing portion 35 is provided at some places on the screw thread 31, and the contents such as carbonated drinks can be vented at the time of opening, and at the time of opening. Cap flight can be prevented.
As in the first embodiment, a prize mark is engraved on the inner surface of the top surface portion, and a number of fine protrusions 26 are provided.
[0047]
In the cap of this embodiment, an annular groove 27 that is recessed and thinned toward the outer surface side of the top surface portion is formed inside the inner ring 21, and the resin pad 10 extends from a part of the groove to the inside thereof. Has been given to.
Further, an annular rim portion 17 having a height slightly higher than the flat plate portion 11 is formed at the edge of the flat plate portion 11 of the resin pad, and no slit or score is formed in the annular rim portion 17.
The portion of the annular groove 27 is a thin circumferential portion that prevents the seal portion from being deformed by the doming phenomenon of the top surface portion 2 due to an increase in internal pressure, or a cap caused by temperature change or impact from the outside. This is advantageous in that it can absorb the deformation and prevent the seal portion from being deformed and maintain a reliable seal. Further, the annular groove 27 performs an excellent function in preventing the resin pad from protruding outward.
[0048]
In FIG. 11 showing the molding process of the resin pad 10 of the second embodiment, the resin pad molding apparatus 8 comprises a center punch 81 located at the center, a sleeve 82 located outside, and a bushing 83 located between the two. They are provided concentrically and slidable independently in the vertical direction.
The sleeve 82 is biased downward by an elastic member (not shown) such as a push spring, and the bushing 83 is also biased downward by the elastic member, but the pressing force is weaker than that of the sleeve 82. It is supposed to be.
The center punch 81 is provided with a knob forming cavity 84 at the center, and is provided with a flat plate forming surface 85 and a slit or score forming projection 86 on the lower surface.
[0049]
First, in the first step (A), the resin cap body 1 supplied with the molten resin mass 7 is conveyed below the molding apparatus 8, the molding apparatus 8 is lowered, and the sleeve 82 contacts the annular groove 27. Touch.
Next, in the second step (B), the center punch 81 descends to start molding the molten resin mass 7 into the shape of a resin pad.
In the final step (C), the molding of the resin pad 10 is completed, but the excessive resin portion of the molten resin lump pushes up the bushing 83 and flows into the annular rim portion 17.
[0050]
The resin cap with a resin pad according to the first embodiment can be manufactured by using a two-piece molding apparatus including a center punch 81 and a sleeve 82 instead of the three-piece molding apparatus shown in FIG.
[0051]
In the resin cap with a resin pad of the present invention, it is particularly preferable to form a relatively thick annular rim 17 on the peripheral edge of the resin pad 10 by using, for example, a molding apparatus shown in FIG.
As already pointed out, the protrusion of the resin pad 10 to the outside or the insufficient coating is due to the rolling of the molten resin mass applied to the inner surface of the top surface portion, and the fine protrusions 26 on the inner surface of the top surface portion are useful for preventing this rolling. However, the protrusion of the resin pad 10 to the outside and the lack of coating are less in the amount of molten resin mass than in the case of a normal liner, and the amount of fluctuation (amount of excess or deficiency) is also large. Also related.
That is, if the amount of resin is excessive, it will cause outward protrusion, whereas if the amount of resin is insufficient, it will cause insufficient coating.
[0052]
According to the above configuration of the present invention, excess resin for the resin pad can be absorbed as the thickness of the annular rim 17, thereby eliminating the molding failure of the resin pad, improving the sealing performance and appearance characteristics of the cap, and further improving the yield. By improving, it becomes possible to increase productivity.
[0053]
Examples of the resin used for molding the cap body 1 include various plastics such as low-, medium- or high-density polyethylene, linear low density polyethylene, polypropylene, thermoplastic polyester, polyamide, styrene resin, ABS resin, and the like. Among these, high density polyethylene (HDPE) and polypropylene (PP) are particularly suitable.
[0054]
The cap main body 1 used in the present invention is manufactured using the above-mentioned resin, usually in a state where the upper lid for reseal and the circumferential band are integrated by compression molding, injection molding or the like. The bridge can be formed by the above-described molding process, or can be formed by performing a known cutting process after the molding process.
[0055]
The resin constituting the resin pad 10 is appropriately selected and used depending on the resin and purpose of the cap body.
That is, when the resin pad 10 is used as a concealing cover for the prize mark as in the first and second embodiments, the one that causes peelable adhesion to the cap body is used.
For example, when the resin cap body is formed of high density polyethylene, a blend of polyethylene and styrene elastomer is suitable for the purpose of peelable adhesion. The ratio of polyethylene (A) to styrenic elastomer (B) is
A: B = 9: 1 to 3: 7
It is preferable that it exists in the range.
On the other hand, when the resin cap body is made of polypropylene, it is preferable to use low density polyethylene (LDPE), particularly linear low density polyethylene (LLDPE). These low density polyethylenes can be blended with various elastomers and used to form resin pads.
In the resin for forming the resin pad, various pigments are preferably blended in an amount of 0.001 to 3 parts by weight per 100 parts by weight of the resin so that the prize mark can be concealed.
[0056]
On the other hand, when the resin pad is made of an oxygen-absorbing resin composition, various resins can be used without considering releasable adhesion, for example, various olefin elastomers can be used.
As the oxygen absorbent to be blended in the resin, known oxygen absorbents such as reduced iron powder can be used, and these can be used in an amount of 1 to 40 parts by weight per 100 parts by weight of the resin.
[0057]
[Example 3]
A modification of the first embodiment is shown in the third embodiment shown in FIGS.
In this specific example, the resin pad 10 for concealing the concealment mark concealment is formed of a flat plate portion 11 and a central peeling start knob 12, and no slit or score is provided. The peeling of can be sufficiently performed.
[0058]
[Comparative Example 1]
A comparative example 1 shown in FIGS. 14 and 15 uses a resin cap body 1 ′ in which fine protrusions are not formed on the inner surface of the top surface portion instead of the resin cap body 1 used in the first embodiment. 10 moldings were performed.
In this resin pad 10, the protruding portion 18 is formed on the inner ring 21, which is unsatisfactory in terms of appearance characteristics and sealing performance.
In the cap of Example 1, the defective product occurrence rate was zero, whereas in the comparative example 1, it reached about 30%.
[0059]
【The invention's effect】
According to the present invention, in a resin cap provided with a resin cap body having a top surface portion and a skirt portion, and a resin pad formed by resin molding on the inner surface of the top surface portion, the resin cap body is mounted on the top. The inner surface of the cap has a sealing portion formed integrally therewith, the resin pad is formed inside the sealing portion of the inner surface of the top surface of the cap body, and the inner side of the sealing portion of the inner surface of the top surface portion A plurality of fine protrusions smaller than the thickness are formed in the thickness direction of the resin pad. The fine protrusions are distributed around the circumference, and a large number of concentric circles are arranged. This prevents the rolling of the resin during molding of the resin pad, eliminates defects such as external protrusion to the sealing part of the resin pad and insufficient coating of the resin pad, and the appearance characteristics and commercial value of the cap It is possible to provide a resin cap with a resin pad that is excellent in sealing performance of the cap and various performances as a cap. Further, according to the present invention, the resin pad is provided on the inner side of the sealing portion on the inner surface of the top surface portion so as to conceal the prize mark, and the resin pad can be peeled off from the top surface portion with the prize mark transferred. It is possible to provide a resin cap with a resin pad for a prize.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an example of a resin cap body used in the present invention.
2 is a bottom view of the resin cap body of FIG. 1. FIG.
3 is a cross-sectional view showing a state where a molten resin mass is supplied to the resin cap body of FIG.
4 is a bottom view of a resin cap body supplied with the molten resin lump of FIG. 3. FIG.
FIG. 5 is a cross-sectional view of an example of a resin cap with a resin pad according to the present invention.
6 is a bottom view of a resin cap with a resin pad in FIG. 5. FIG.
7 is an enlarged partial cross-sectional side view showing the resin cap with a resin pad in FIG. 5 together with a container mouth portion.
FIG. 8 is a cross-sectional view of another example of a resin cap with a resin pad according to the present invention.
9 is a bottom view of the resin cap with a resin pad of FIG. 8. FIG.
10 is an enlarged partial cross-sectional side view showing the resin cap with resin pad of FIG. 8 together with the container mouth portion.
FIG. 11 is a process diagram for explaining a resin pad molding process;
FIG. 12 is a cross-sectional view of still another example of a resin cap with a resin pad according to the present invention.
13 is a bottom view of the resin cap with a resin pad of FIG. 12. FIG.
FIG. 14 is a cross-sectional view of a resin cap with a resin pad manufactured using a resin cap body in which fine protrusions are not provided on the inner surface of the top surface portion.
FIG. 15 is a bottom view of the resin cap with a resin pad of FIG.

Claims (4)

In a resin cap provided with a resin cap body provided with a top surface portion and a skirt portion, and a resin pad formed by resin pressure molding on the top surface portion inner surface,
The resin cap body has a sealing portion formed integrally therewith on the inner surface of the top surface portion, and the resin pad is formed on the inner side of the sealing portion of the inner surface of the top surface portion of the cap body, and on the inner surface of the top surface portion. A plurality of fine protrusions and a prize mark smaller than the thickness of the resin pad are formed inside the sealed portion ,
Peeling the fine protrusions are formed in the thickness direction of the resin pad, and distributed circumferentially are arranged large number Rutotomoni concentrically provided, wherein the resin pad and the top face portion inner surface through said microprojection Combined as possible ,
A resin cap provided with a resin pad. 2. The resin cap according to claim 1, wherein the resin pad has an annular rim having a thickness larger than that of other portions on the periphery. The annular groove is formed in the radially inner peripheral edge of the sealing portion of the inner surface of the top surface, and the resin pad is applied from a part of the annular groove toward the radially inward side. The resin cap described. Characterized in that said cap body has the prize mark consisting of protrusions and / or recesses in the other fine protrusions, the said prize mark before Symbol resin pad top surface portion inner surface is peeled in a state of being transcribed The resin cap according to any one of claims 1 to 3.

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