JPH01308756A - Vessel lid and the production and vessel fitted with the same and its production - Google Patents

Abstract

PURPOSE:To prevent deformation of the periphery of a lid and increase a strength against the inner pressure, by inserting a metal foil lid member between a metal mold for resin extrusion, which has a cavity to mold a resin ring at the periphery of the lid member, and another metal mold for the couple thereof. CONSTITUTION:A metal mold for extrusion comprises an upper mold 20 and a lower one 21 in which a spool 22 and a runner 23 are provided to connect with an extrusion plunger for feeding melted resin upward. A cavity 24 is formed to connect with the runners 23. After a lid member 11 is placed on the formed plane of the cavity 24, thermoplastic resin is extruded with the pressed lid member on the lower mold 21. An endless resin ring 13 is melted together with the lid member 11 at the rear side of the lid member 11. Then, a vessel lid is obtained, in which a joint edge 14 with the section of inversed U is formed on the periphery thereof. The lid member 11 is laminated with approximate 100mu thermoplastic resin film on a base member of approximately 120mu thick metal foil. Thereafter, the vessel body 15 is covered with the vessel lid and both are bonded by melting at the joint edge.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lid (including a bottom lid) for a liquid container to which internal pressure is applied, a container equipped with the lid, and a method for manufacturing the container lid.

[Prior Art] Conventionally, metal cans, glass bottles, and composite containers are known as containers for filling and sealing sparkling drinks such as fermented yogurt or weakly carbonated drinks. In order to fill these containers with the contents and seal them, internal pressure is applied to the container itself from the inside, so the lid itself needs to be relatively thick so that it is not easily deformed. On the other hand, in order to fix the lid to the container body, special equipment such as a seaming machine or a capping machine with a relatively complicated mechanism had to be used.

In other words, when sealing a container lid that is subject to internal pressure from the inside, even if you seal it with a heat sealer like the one used to tighten the lids of containers that store beverages that are not subject to internal pressure, such as juice or milk, the liquid will not leak. Since leakage occurs and it is not practical, conventionally the lid has to be sealed using a seaming machine or a capping machine, which have completely different properties from the heat sealer. The lid used for the seaming machine etc. mentioned above is
It is difficult to reduce the thickness of the G5 layer at the bottom in terms of suitability for the buttocks, and in order to increase rigidity, the thickness of the metal foil layer constituting the lid is usually 200 to 300 mm thick.
μ or more, and even in such a case, when sealing the lid by applying the heat sealing method, the internal pressure strength can withstand an internal pressure of about 1.3N5F/i at most. It was nothing more than

Furthermore, conventional container lids are made of metal foil alone, or
Alternatively, this product is often made of paper or a laminated layer of paper and a synthetic resin coating, and a synthetic resin ring is integrally molded with the lid on the back side of the lid made of the above material. The thing didn't exist.

[Problems to be Solved by the Invention] As mentioned above, containers for storing drinks into which carbon dioxide gas has been pressurized or drinks that are effervescent per se require structural engineering due to their adaptability to mechanical devices for filling and sealing. There were various restrictions, and the lid itself also had structural restrictions due to its relationship with the filling. In other words, the beverage container for the above purpose is made of a material that is rigid enough to withstand the internal pressure, since internal pressure is applied to both the container body and the container body.
In addition to configuring each of the above-mentioned members, it is also necessary that the joint portion between the two be constructed to withstand the above-mentioned internal pressure. Due to the actual situation, the container itself is generally gold fi! ! For example, steel cans or aluminum cans, or composite materials made of paper, aluminum foil, plastic films, etc., were often used. In addition, the top and bottom lids of the can are usually made of highly rigid tin plates, aluminum plates, plastic plates, etc. due to the relationship with internal pressure. In this case, a so-called tightening structure was adopted, in which one end edge was rolled over the other and the two were bonded together via a ferrule, thereby making it possible to withstand internal pressure.

On the other hand, as a means to make it easier to take out the contents,
In relation to the internal pressure, it is common to provide a so-called pull-top opening tab (a method in which a half-cut line is inserted in the cord material at the opening) on the lid for easy opening. However, it was not possible to install a container with a simple discharge port, which is used in beverage containers for milk, juice, etc., due to the internal pressure. In other words, it is generally not possible to have an opening made of an IIG membrane that allows a straw to be inserted into the straw, or to have an opening that allows the thin membrane to be peeled off with one's fingers. Ta.

In addition, this type of liquid container in particular is often sold through vending machines, so it is necessary to withstand the load of dropping at that time, so conventionally, it has been half-cut into a thick metal lid plate like the one mentioned above. In addition to providing a pull-top opening divided by lines, create an appropriate frontage by 1! '7 The reality is that they were unable to do so.

If the strength of the lid itself could be increased, not only for pressure-resistant containers such as those mentioned above, but also for general containers,
This type of container is easy to handle when closing it or handling it during the distribution process, making it a highly convenient product.

[Means for resolving the problem] Regarding J3, the present invention provides a substantially endless peripheral portion of the back side of the lid H containing at least metal foil to avoid forming a thermoplastic resin film on the back surface. The above-mentioned problem is solved by integrally welding a resin ring made of a thermoplastic synthetic resin to the lid by injection molding or heat fusion.

The metal foil, which is the main part l, is made of metal foil such as iron foil or aluminum foil, and if necessary, paper is laminated on the material foil, and at least one side of the lid plate is covered with: A thermoplastic resin film made of polyethylene, polypropylene, polyester, polyvinyl chloride, etc. or a hot melt resin film other than the above is used, and the resin film surface is formed on the back side of the lid material. It is necessary.

Note that it is possible to separately form the synthetic resin liquid 11Q on the surface side of the lid plate in the negative direction. Further, the thickness of the metal foil in the present invention is in the range of 50 to 130 μTrL, preferably 80 to 120 μm.

Furthermore, the thickness of the resin film on the back side of the lid is 1
In the range of 0 to 100 μm, preferably 50 to 80 μm
It is possible to set it to m.

On the other hand, using a thermoplastic synthetic resin that is compatible with the resin film, the endless ring is attached to the lid material at least on the back side of the device by means of heat fusion or injection molding. The ring is welded together, and the ring is preferably formed near where the lid member is joined to the body member constituting the container body, preferably as close to the body member as possible. Furthermore, the meaning of "substantially endless" does not only include the case where the entire ring is literally continuous without any cuts, but also includes the case where there are cuts in several places, but the ring does not appear to be connected upwardly. It doesn't matter if you do.

Furthermore, when providing the lid H with an opening for taking out the contents, a through hole is previously made in the lid at the portion corresponding to the opening, and an endless hole similar to the above is also provided around the opening. After forming a shaped ring, a thin film opening tab is heat-sealed by covering the through hole from above through the ring. Sometimes injection molding and r! Alternatively, only the opening tab may be attached to the surface of the lid material in a separate process. As for the cumulative period of iI9 film, J2 is 10 to 50μ.
Using relatively thin aluminum foil or tissue paper in the range of 7n, a thermoplastic resin film of the same weight as above is formed on the back or both sides of the material to enable thermal adhesion to the lid material. . The thin film may be formed by laminating a resin film with good gas barrier properties such as PET on thin paper (30 to 60 yen/bottom) or by sandwiching it.

Furthermore, it is also possible to incorporate an opening means in which a discontinuous cut line or a U-shaped cut line is preformed in the lid itself, without using an opening tab as a separate member.

The present invention makes it possible to tighten the lid using the conventionally used heat-seal structure, and also to provide a lid using a relatively thin metal foil material. Furthermore, the purpose is to provide a new container lid that allows the tab to be peeled off with one's fingers, making it more convenient for consumers to use and reducing costs. be. Furthermore, according to the present invention, the metal material used as the lid material can be made as thin as about 50 μm, making it possible to bond by high-frequency sealing, and furthermore, the endless resin ring increases the strength of the lid. It is also unique in that it exerts a deformation prevention effect against external impacts.

Furthermore, in the present invention, between the resin injection mold in which a cavity for molding the resin ring is formed in the peripheral part of the lid material and the other mold forming a pair with the resin injection mold, there is a Metal foil with a thermoplastic resin film formed on it! After inserting the lJu material, the resin injection mold is clamped, and then the resin is injected through the resin injection mold, so that the container lid having the above structure can be manufactured in one step. intended. In addition, a roll of a strip-shaped material made of gold fflfm laminated with a thermoplastic synthetic resin film is prepared, and while the roll is intermittently fed out, the resin ring is formed into the synthetic resin film by injection molding through a mold. After integrally welding it to the laminate surface of the container, this material is guided to a punching press and punched out into a circular or rectangular shape corresponding to the top or bottom surface of the container, and a joint edge with a cross-sectional opening shape is formed around the periphery. The method includes a method for forming.

[Embodiment] Figs. 1 to 3 are a plan view and a sectional view showing an embodiment of a container lid according to the present invention (this embodiment is an example of a weapon without an opening mechanism). In the same figure, the symbol @11 indicates a lid member, and this lid member is made of a metal foil such as steel foil or aluminum foil having a thickness of about 120μ.
11a, and a thermoplastic resin film (PE) of approximately 100μ so as to cover at least the entire back side of this material
Membrane) 11b is laminated in advance.

Although not shown in the drawings, the lid material may be a laminate of metal foil and paper (paper with a thickness of 30 to 60 degrees), or a thermoplastic resin with a thickness of about 50 to 100 μyn coated thereon. It is better to use one that has been pasted together.

Now, on the lower surface of the lid member 11, an endless ring 13 is integrally formed with the lid member at the periphery of the lid member and the periphery of the opening by injection molding. Shape. The edge of the container member is provided with a joint edge 14 bent into a U-shaped cross section as shown in FIG. 15 is thermally bonded. The material j31 of the body part that can be used for the soba of the present invention may be made of paperboard, metal plate, or a so-called composite material, or may be made entirely of thermoplastic resin. In any case,
It is necessary that a resin film 15b that is compatible with the thermal bonding surface of the container lid 11 is provided on the surface of the base material 15a constituting the body.

Next, an example of manufacturing the container lid of the present invention will be explained based on FIGS. 5 and 6. FIG. 6 shows a cross section of an injection mold. In the same figure, reference numeral 20 is an upper mold, 21 is a lower mold, and inside the lower mold 21 there is a mold for feeding molten resin from below. A sprue 22 and a runner 23 connected to an injection plunger (not shown) are bored, and a cavity 24 is formed so as to communicate with these runners 23. The lid portion 141 is placed on the surface where the main 12 bitty 24 is formed.
1 is placed at #&, and then injection molding of thermoplastic resin is performed while press-bonding this to the lower mold 21. In case of scolding, please refer to Figure 5B
As shown in FIG. 2, a container lid is obtained in which an endless resin ring 13 is integrally welded to the back side of the lid member 11 and a joining edge 14 having an inverted U-shaped cross section is formed at the peripheral edge thereof. It is. Furthermore, the mold shown in Fig. 6 is designated by the reference numeral 2 in the same figure.
The molding grooves and molding protrusions indicated by 5a and 25b are provided in correspondence with each other, and these are for the purpose of loosely fitting the joining edge 14 formed using a press rock or the like in the previous preforming step. . However, in some cases, the joining edge 1 may be simultaneously injection molded through the molding groove and the molding protrusion.
4 may be formed, or after molding is performed without providing molding grooves and molding protrusions that extend over the mold, a flat plate-like lid member as shown in FIG. 5 is then formed. After C obtains
This material may be press-molded separately 79 in the next step, and then the joining edge 14 may be formed.

FIG. 1 Δ shows the container lid 19 that is placed over the container body 15 filled with the contents.
, is an explanatory diagram when the container is sealed by melting the two together at the joint edge 14 at the periphery of the container. In the figure, reference numeral 30 denotes a seal head having a heater 31 therein, and 32 denotes a seal jaw disposed on the outer periphery of the seal head, which presses the jaw against the seal head in the radial direction.
The head 30 is heated to heat-seal the container lid 11 to the front edge of the container body 15. In addition, the first
As shown in FIG. 8, the joining edge 14 is folded back inside the container,
This could also be joined to the container body 15.

As mentioned above, since the endless resin ring 13 is formed integrally with the device around the back surface of the lid 11 in J3 of the present invention, the conventional type in which such a ring is not formed Compared to container lids, it shows the following differences in terms of function and effect. FIG. 9 Δ shows the case where a conventional container lid without the ring is used, and FIG. 9 B shows the case where the container lid E of the present invention is used. As shown in the song title J3, if the peripheral edge is sealed to the body 15 through the joint edge 14d, when the internal pressure due to the beverage in the container reaches approximately IKFI/cti, nD as shown in A in the same figure. swells outwards and breaks (peels off) the thermally bonded part S, causing liquid leakage. However, as shown in FIG. 8, when an endless resin ring 13 is integrally formed on the back side of the peripheral portion of the lid member 11, the ring 13 contributes to improving the internal pressure resistance. ,
Even if the internal pressure inside the container increases, the thermally bonded part S will not be destroyed or adhesive peeling will not occur in this part. This was investigated through the experiments described below (results are not shown). Figure 10 is a schematic diagram of the experimental apparatus, in which a container fitted with the container lid of the present invention is immersed in a water tank F. ``, and pressurized air was introduced from the bottom of the container via ・j(-suG), and while reading this air pressure with the gauge 14, the behavior of the container lid in the present invention was observed by changing the air pressure. .

The height of the container body used in the test was 134 mm, and the inner diameter was 53 mm.
mmφ, and the above-mentioned HD 13 and E (
Laminate 100μ thick polyethylene resin onto 120μ aluminum foil. It is integrally formed with an inner diameter of 44.5 m, an outer diameter of 50.5 m, and a height of 1.5 m. Figures 11A and 11B are the results of a study of how the shape of the lid changes in response to changes in internal pressure, with and without a resin ring attached to the periphery of the lid. On the other hand, FIGS. 12A and 12B similarly illustrate changes in the shape of the peripheral portion of the lid.

The numbers in the figure indicate the gauge pressure of pressurized air introduced into the container via the experimental device. However, in the conventional lid structure, as shown in FIG. 11A, 1.4 K
9/ crA 1. : When the pressure reached 1.9 kg/CIA, bubbles were generated and it was found that it could not withstand any higher internal pressure.On the other hand, it was found that in the case of the present invention, bubbles were generated only when the pressure reached 1.9 kg/CIA. The table below shows the actual values in the experiment.

(Left below) Unit: To! ? 10i (gauge pressure) - As is clear from the table above, the pressure with the resin ring is approximately 0.5/(y/ci) compared to the one without the ring.
The degree and intensity increase.

Based on the above experimental results, the presence of the resin ring 13 suppresses the occurrence of wrinkles in the periphery of the lid, resulting in a
It was found that within the range of crA, almost no deformation of the lid occurred. Furthermore, if the outer diameter of the resin ring is made closer to the inner diameter of the container 1), the degree of deformation will be less than that, and the internal pressure strength will be further improved accordingly.

Incidentally, as shown in FIG. 8C, the endless ring 13
When bonding the lid 11 to the container 111 part 15, the ring is shaped so that it partially melts and bites into the inner surface of the joining edge 14, which has a U-shaped cross section, during heat bonding. It is also possible to mold and dimension the curved portion 13c to the right.

In this case, the resin corresponding to the rising portion 13c is
As illustrated in Figure A, it is provided in advance on a flat lid material. That is, a ring 13c that is thinner than the endless ring 13 is formed concentrically on the outside of the endless ring 13, and then this ring is introduced into a press molding machine and its cross-sectional shape is changed as shown in FIG. This is then joined to the container body via a sealing device shown in FIGS. 1A and 1B.

In this case, the resin 13C corresponding to the rising portion melts and flows downward when the joint edge 14 is heat-sealed to the container body, so that it fills the gap between the lid material and the body, and as a result, both This further increases the adhesive strength of the lid and provides greater resistance to the action of peeling off the lid due to internal pressure.

The embodiments shown in FIGS. 13 to 17 show cases in which a ring pull or tab for opening is attached to the container jacket of the present invention. That is, in the present invention, as shown in FIGS. 13 to 17, a ring pull 40 or a pull tab 41 can be integrally formed on the upper surface of the lid 11. In this case, for example, a discontinuous A cut line 11C is formed, and a resin ring 13a similar to the above is welded to the lid 11 by injection molding from the bottom side of the lid 11 to cover this cut line, as shown in FIG. 18C. As a result, the cut line is closed with the resin, and at the same time, a resin anchor 43 is attached to the lower surface of the lid integrally with the lid, and a ring pull 40 (or pull tab 41) connected to the anchor is drilled into the lid 11. Processing is performed so that injection molding is performed all at once through the provided through hole 42. Thus, the ring pull 40 (or pull tab 41) has a notch protruding from the top surface of the lid.
When the lid 11 is pulled in the direction shown by the arrow in FIG. 16, the lid 11 is peeled off from the above-mentioned cutting line 11.C, and the lid 11 can be removed in a nearly fully open state. In this way, the container can be opened and the contents removed. In addition, as shown in FIGS. 15 and 17, when the pushing piece 41a is extended at the tip of the pull tab 41, the lid 11 can be pushed inward by the pushing piece. It is easier to open the container compared to other containers.

18A to 18C do not show an example of manufacturing a lid to which the ring pull 40 (or pull tab 41) is attached. First, as shown in FIG. 18A, the joint edge 14 is preformed.
A discontinuous cut line 11 is
After drilling C and the through hole 42 (see FIG. 8), this product is molded into an injection mold 20. having a cross-sectional shape as shown in FIG.
21 and then injection molded in the same manner as described above, a lid as shown in FIG. 13 or 15 can be obtained.

In this case, a disc-shaped lid member as shown in the same figure can be obtained by using a continuous strip-shaped material as a starting material and punching out a disc-shaped lid member from this material and sequentially processing it as described above. can also be adopted.

Figures 19 and 20 show a lid having an opening mechanism different from that described above. That is, the punched holes 44 are formed in the lid member 11.
After drilling, when welding the resin ring 13 to this lid member, at the same time, an endless resin opening edge 45 that covers the peripheral part of the punched hole 44 is provided integrally with the lid by injection molding, The upper surface of this opening edge 45 is made to protrude slightly from the upper surface of the lid 11, and a strip-shaped opening tab 46 is heat-fused to the upper surface of the protruding end 45a thus formed. Since a groove 4Ga is formed at the tip of the opening tab 4G, when the opening tab 4G is grasped and the entire opening tab is peeled off from the opening edge 45, the opening 44 previously formed in Mll is removed. The contents will be exposed and the contents can be removed from this area.

FIG. 21 is an explanatory diagram of the process in the case of continuously manufacturing Mll equipped with the opening tab 4G, and as shown in the figure, first, using the base material winding 5o used for the flll as a starting material, While this material is intermittently fed out, the sheet-like base material 50a is first passed through a punching hole to punch a 1 m opening hole. This punched hole may have a shape as shown in FIGS. 19-20, or may be formed into an annular cut 111c as shown in FIGS. 13 and 15.

In addition, the bottom cover as shown in Figures 1 and 2 can be manufactured continuously. i
Needless to say, in this case, it is not necessary to pass through the punching 4151.

The U material 50a with the predetermined punched holes formed therein is led to the next injection molding process, where it is inserted between the upper and lower molds 20. The resin ring 13 described above is attached to. In this case, the winding 46b of the unsealing tab 46 is intermittently run on the upper part of the upper mold 20, and the winding 46b of the unsealing tab 46 is moved to a predetermined position via a plunger-type feed head 20a installed in the center of the mold. While punching out the shape and dimensions, it can also be bent by 1 degree so as to be attached to the upper surface of the annular resin opening edge 45 during injection molding of the resin ring.

In this case, an injection molded container lid with 14 tabs having a cross-sectional shape as shown in the upper part of FIG. 21 is obtained. In this case, the glue material is indicated by the reference numeral 50b in the figure.

Above) Form a predetermined resin ring 13 on the surface of the sheet-like belt-like ESU 50a or 50b as shown in E, or mold the opening edge 45 at the same time as the molding of the ring, and then As shown by reference numeral 50c in the figure, it is wound into a cylindrical shape for final winding. Note that this material is not necessarily rolled up into a cylindrical shape, but may be folded in a staggered manner and stacked as shown in FIG.

In either case, the 1It material with the resin ring processed as described above is led to the next step J3 and stamping forming 1j153 as shown in FIG. At the same time, a barrel disc shape is punched out, and at the same time, a joint edge 14 having a zero-shaped cross section is formed on the peripheral edge of the lid to produce a product as a lid member, and a seal S as shown in FIGS. 1A and B is formed online or offline. ! The i-device is used to tighten the lid on a container body filled with contents.

The container lid of the present invention can be applied even when the shape of the container body is not cylindrical but a square container.
A sealing jaw 3334 as shown in FIGS.

In addition, the endless ring 13 or 13a according to the present invention
does not have to be strictly endless, and may be slightly interrupted in some parts.

Figures 26A and 26B show an example in which a U-shaped opening cut IQ60 is applied to the surface of the container M11 according to the present invention. This is an example in which the resin film 11e is laminated, and the cut line 60 of the shape described above is previously bored in the metal foil 11d. Note that this cutting line can also be used as a discontinuous perforated cutting line.

[Effects of the Invention] The container lid of the present invention has an endless resin ring 13 in the vicinity of the joint with the container body 15 in the periphery of the lid member 11.
Or, since 13a is attached integrally with the lid material,
Unlike the conventional type in which the joint edge 14, which has a cross-sectional opening shape, is simply fitted into the edge of the container body 15 and thermally bonded, the container Even if an upward force is applied to the lid itself due to the internal pressure inside, the presence of the ring suppresses deformation (occurrence of wrinkles) around the lid by 4 degrees, resulting in a reduction of 1.3 to 1
．． It can withstand internal pressures of about 7 to 9/cd, increasing the internal pressure strength accordingly. Note that the closer the outer diameter of the resin ring is to the inner diameter of the container body, the more
Its strength also increases.

As mentioned above, conventional lids used for gas beverage containers such as weakly carbonated beverages require increasing the thickness of the metal foil and thermoplastic resin layer that make up the lid, or widening the seal width between the lid and the container. On the other hand, when joining the lid to the container body, it was necessary to seal it using a seamer with almost the same structure as that used to seal metal cans. In this case, it becomes possible to use a heat sealer that has been commonly used in the past.

Furthermore, since the above-mentioned endless ring is attached to the lid of the present invention integrally with the lid material, it is possible to suppress deformation when dropped, which has traditionally been a problem that had to be solved. It exhibits sufficient strength to withstand the drop load that is used in applications such as

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the container lid of the present invention, FIG. 2 is a cross-sectional view of the same, FIG. 3 is a rear view of the same, and FIG. 4 is a view of the container lid of the present invention being joined to the container body. FIG. 5A and FIG. 8 are explanatory diagrams showing the molding process of the container lid, and FIG. 6 is a partial sectional view showing an example of the container lid. wLIgi surface view, Figure 1A
and B are longitudinal cross-sectional views showing an example of a heat sealer used when bonding the container lid of the wooden invention to the can body, which is the container body. This figure shows another example in which the resin ring is formed concentrically with the lid.
Figure 8 shows the press-molded state, Figure C is an enlarged vertical cross-sectional view of a portion of the container without showing the case where the lid is glued to the container, and Figure 9
Figures A and B are explanatory diagrams showing the state in which internal pressure is applied to the lid, Figure 10 is an explanatory diagram showing the outline between the test bags, Figure 11 △ and B, and Figure 12 A and B are explanatory diagrams showing the state in which the internal pressure is applied. FIG. 13 is a plan view of a base according to another embodiment of the present invention, FIG. 14 is a sectional view of the same, and FIG. 15 is a diagram showing another embodiment of the same. 1 is a plan view of the lid, Figure 16 is a sectional view of the same as above, Figure 17 is an explanatory diagram when the lid is opened with dimensions shown in Figure 14, and Figure 18 ~C is m1.
FIG. 19 is an explanatory diagram showing an example of manufacturing a lid with an opening, in which A-8 is a sectional view of the lid material, C is a sectional view of an injection mold, and FIG. 19 is a sectional view of the lid material. A plan view of the lid showing yet another embodiment, FIG. 20 is a sectional view of the same as above, and FIG. 21 is a process diagram showing an example of the case where the container lid of the present invention is continuously assembled.
Fig. 22 is a side view showing the folded state of the band-shaped lid base material to which the resin ring is welded, and Fig. 23 is a skeletal cross-sectional view showing the state in which the band-shaped base material is processed in a stamping process. , FIG. 24 is a perspective view of a heat sealer when the lid of the present invention is applied to a square container, FIG. 25 is a plan view showing the sealing situation when the lid of the present invention is applied to a triangular container, and FIG. 26A is a container lid. FIG. 8 is a sectional view of the same. 11: Container lid, 11a: Gold fi foil, 11b: Thermoplastic synthetic resin film, 13.13a: Blank*i: shaped resin ring, 13C: Rising part, 14: Joint edge, 15: Container body,
Honshu Paper Co., Ltd.

Claims (1)

[Scope of Claims] 1. On the back side of a lid material on which a thermoplastic resin film is formed, a substantially endless thermoplastic resin film located around the joint between the lid material and the container body. A container lid made of a heat-sealed endless ring made of resin. 2. The container lid according to claim 1, wherein the lid material is made of metal foil or a composite material of metal foil and paper or a thermoplastic synthetic resin film laminated thereon. 3 At least on the back side of the metal foil lidding material on which a thermoplastic resin film is formed, a substantially endless ring made of thermoplastic synthetic resin is placed around the joint between the lidding material and the container body. 3. The container lid according to claim 1 or 2, which is welded by injection molding. 4 At least on the back side of the metal foil lid material on which a thermoplastic resin film is formed, a substantially endless ring made of thermoplastic synthetic resin is placed around the joint between the lid material and the container body. 3. The container lid according to claim 1 or 2, which is welded by injection molding. 5 At least on the back side of the metal foil lid material on which a thermoplastic resin film is formed, a substantially endless ring made of thermoplastic synthetic resin is heated around the joint between the lid material and the container body. A container characterized in that a fused container lid is heat-adhered to a cylindrical or prismatic container body. 6. The container according to claim 4, wherein the container body is made of metal, synthetic resin, paperboard, or a composite material. 7 A thermoplastic resin film is formed on the back surface between a resin injection mold in which a cavity for molding a resin ring is formed in the peripheral part of the lid material and the other mold forming a pair with the resin injection mold. The container lid of claim 1 is manufactured by inserting the metal foil lid material, then clamping the resin injection mold, and then injecting the resin through the resin injection mold. Features: Lid manufacturing method. 8 After attaching a substantially endless ring made of thermoplastic synthetic resin to one side of the band-shaped base material for the lid material by injection molding or heat fusion, this ring is further attached. The container lid according to claim 1 is produced by introducing the lid into a punching press and punching it into a circular or rectangular shape corresponding to the top or bottom surface of the container, and forming a joining edge to the container body at the peripheral edge thereof. A method for manufacturing container lids. 9 A thermoplastic resin film is formed on the back surface between a resin injection mold in which a cavity for molding a resin ring is formed around the lid material and the other mold forming a pair with the resin injection mold. Claim 1: The container lid is manufactured by inserting the metal foil lid material, then clamping the resin injection mold, and then injecting the resin through the resin injection mold. Method of manufacturing the container lid described.