JPS602431A - Cover body for pressure-resistant vessel made of paper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a lid for use in a paper pressure-resistant container for beer, carbonated drinks, etc., which has an outwardly convex ball portion and which has poor pressure resistance. Moreover, since a slow-closing film that seals air is provided inside the bulb part, the flavor of the contents of the container is not impaired, and the lid for a pressure-resistant paper container can be opened fully. It is something.

In recent years, due to advances in materials and processing methods, beverage containers have been replaced by traditional glass bottles or steel cans.
Containers are being replaced with materials such as aluminum, plastic, and paper. Most beverage containers are treated as disposable containers, and empty containers after use by consumers can be collected or recycled, even if they are made of recyclable steel or aluminum cans.
It is not reused. The reasons for this include collection and sorting labor, transportation costs, temporary storage space, collection container cleaning water (J
This is because the cost of recovery and recycling is high due to water treatment costs, etc. However, even when disposable, steel cans, aluminum cans, plastic bottles, etc. are bulky, so they cannot be incinerated even if they are disposed of as garbage, and even when used in a landfill, they create cavities that disturb the landfill. There remain problems with the use of.

For these reasons, there is a demand for a switch to paper containers that can be easily disposed of after use, and many beverages, such as milk and juice, have already been replaced with paper containers. However, none of these T+ drinks contain carbon dioxide gas, and the pressure inside the container at room temperature is almost equal to atmospheric pressure, so most of the M-made pressure responders for beer and carbonated drinks are I can't watch it.

The reason why the development of paper pressure-resistant containers has been delayed is that, first, the pressure-resistant specifications required for containers for beer, carbonated drinks, etc. are quite high (the internal pressure of beer is 2 to
2.5 KyAn'fG, about 5 Ky/a at 50℃? +
0. The internal pressure of carbonated drinks is 3-3-5 KP/c%G at room temperature.
.

7 Ky/cni [)] at 50°C and the inability to sole the joint between the body and the lid by seaming like a metal can due to poor bending properties of the paper. Difficulty! Second, it is difficult to achieve a balance between the shape of the lid for increasing pressure resistance and the shape of the lid for not impairing the flavor of the contents of the container. In other words, in order to withstand high internal pressure, it is structurally and economically advantageous to construct the body in a cylindrical shape and the lid in a spherical shape convex outward with a radius approximately equal to the inner diameter of the body. is also the most advantageous shape. On the other hand, the flavor of carbonated drinks, especially beer, deteriorates when it comes into contact with air, so to fill beer into a container, pour beer that has been cooled to around 5 degrees Celsius to about 95% of the volume of the container, and bubbles generated on the surface of the container are poured into the container. The liquid beer inside the container is blocked from air by overflowing from the mouth of the container, and then the lid is quickly placed on the lid to form a tight seal. The almost flat, plate-shaped lid is used for the lid. In the case of aluminum cans, even if the lid has a flat shape, it can be mechanically fixed to the aluminum body, and since the material is aluminum, it is easy to increase the pressure resistance of the container. If the material is paper, which has significantly lower strength than aluminum, a flat lid will have extremely poor pressure resistance. However, in order to improve pressure resistance, if the shape of the lid is made into a convex shape, the lid will be joined to the body with air inside when it is put on, which will reduce the flavor of the beer. The problem arises of damage.

Sixthly, it is difficult to develop a paper lid that can be fully opened and that can be joined to the paper body so as to have sufficient pressure resistance.

Carbonated beverages, especially beer, are meant to be enjoyed while enjoying their color and mellow aroma, as well as knowing the remaining amount at a glance. Therefore, containers with lids that can be used directly for drinking are opaque, such as aluminum cans, where the entire lid is closed. Although a so-called full-open method is desired, in reality only a pull-top method in which a portion of the lid is torn off is available.

The reason for this is that in the fully open system, the joint between the lid and the body must have a strong enough resistance to withstand the full tensile load due to the internal pressure applied to the entire lid. It is not practical because it requires a very large force to open the opening. The same can be said of the paper lid, and it is difficult to create a structure that prevents the above-mentioned resistance from decreasing due to the paper lid being susceptible to change.

Fourth, since the aluminum and steel cans that are already on the market are quite cheap, paper pressure-resistant containers must also have a structure that can be manufactured at a low cost, including solutions to many of the technical difficulties mentioned above. The difficulty arises from economic requirements, which prevents practical use.

Despite the many obstacles mentioned above, the present inventor focused on the many benefits of paper pressure-resistant containers, such as easy crushability and flammability. As a result of grinding for the purpose of supplying a lid for a pressure-resistant paper container that can be easily manufactured and can open in the open, the lid is provided with an outwardly convex spherical part, and the spherical part is The present invention was completed after finding that the object could be achieved by sealing the air inside with a slow-closing film and configuring the lid to be joined to a joining ring fixed to the end of the body.

That is, the present invention is a paper lid body for constructing a paper pressure container by being joined to a joining ring fixed to a paper body, the paper lid body having a barrier barrier on both sides of the paper lid body. The adhesive film is laminated thereon, and has a spherical part in the center that is convex toward the opposite side, and a flat part for joining the bonding ring that is continuous with the spherical part on the inner side slightly closer to the center and located on the periphery. This invention relates to a paper pressure-resistant container lid, characterized in that a slow-closing film made of a barrier film has a structure in which a ball is stuck to the flat part while sealing the air inside the part. .

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a cross-sectional explanatory diagram of an example of a paper pressure-resistant container constructed using one embodiment of the lid according to the present invention, and FIG. 2 is a diagram showing a state in which internal pressure is applied from a state with no internal pressure corresponding to FIG. 1. FIG. 6 is a partially enlarged cross-sectional view of an example of a joining ring to which a lid according to the present invention is joined.

In the drawing, reference numeral 1 denotes a lid related to the unexploded 1 man, and as shown in Fig. 1, the paper bottom 2 is fixed to the other end ΔB of the paper body O which is attached to one end. It is joined to a joining ring 4, which forms a paper pressure-resistant container. "Made of paper" here refers to fibers such as plastic in addition to pulp fibers.
Even if powder, sheet, etc. are used in combination, it is mainly made of materials that have physical properties such as crushability and combustibility that are not significantly different from pure paper products.

As shown in FIG. 1, the lid 1 is a paper lid DI; 50.
A barrier film 6.7 is laminated on both sides, and below C, a barrier film laminated on the inner surface of the lid body 5, a barrier film laminated on the inner surface of the lid body 6 and a barrier film laminated on the outer surface of the lid body 6. MB 1
a and a flat part 1b for joining the joint ring which is shaped like a joint on the inner side along the periphery and slightly near the center, and this flat part 1b
A slow-closing film 8 made of a barrier film is formed continuously on the capsule part 1a.
Of this, 1 tll+ air 9 is sealed, and it is adhered to the flat part 1b in a plane shape by adhesive or thermal welding. In other words, air is enclosed at atmospheric pressure in the entire space surrounded by the lid inner surface film 6 and the planar slow-closing film 8, and since these films 6 and 8 are both barriers, this No air leaks outside the space. The flat part 1b of the lid 1 does not necessarily have to be perpendicular to the cylinder axis X when attached to the integral body 2, and may be slightly inclined. There is no problem with Zhang Non-K. In FIG. 1, the portion 1c on the peripheral Hi side of the flat portion 1b of the lid 1 (hereinafter referred to as the peripheral portion) is shifted by [1+1 It] in a direction substantially perpendicular to the lid surface to form a skirt portion. Although,
This is not necessarily necessary, and a part of the flat part 1b is
'f It is also possible to use only a tongue-like piece extending 1lIll opposite to the central part. It is preferable that the end faces of the periphery of the lid body 1 of this size be covered with a barrier film as shown in FIG. 1 and treated to prevent water from entering from the end faces.

An example of a preferable material for the lid body 5 is pulp h before papermaking.
, #:, Low density polyethylene fiber content in 1ylJ is 25
A dry non-woven fabric mat is shown which is mixed by the air-laying method so as to have a weight φ, and this is formed into a predetermined shape by a hot press, and the lid body 5 is inserted therein. The tensile breaking strength of a F plate-shaped test piece obtained by molding the same dry nonwoven fabric cloak in the same manner was 250 KFi10+?・Each film 6.7 and slow-closing film 8 in the lid body are separated from the barrier 111: film.

Here, the term "barrier film" refers to a film that has a permeability of approximately 200 or less and 114 degrees for gases such as oxygen, carbon dioxide, and nitrogen. 26°C, relative humidity 50% -'F Transmission rate of 1 mil film per 1 mQ in 24 hours)
This is the number of CCs of gas to be used. Examples of such barrier films include polyvinylidene chloride, polyamide, polyester, biaxially oriented polypropylene, polyvinyl chloride,
Polyvinylidene chloride.

Films made of vinylidene Kn-vinyl chloride copolymer, ethyne-vinyl acetate copolymer saponified resin, nitrile type (gj resin, etc.) are shown.In addition to being used alone, such barrier films can also be used, for example, as water-resistant films. It can also be used in combination with other films such as polyester films.A particularly preferred example, which has not only gas barrier properties but also heat bath adhesion properties and water vapor barrier properties, is
) film" (trade name, manufactured by Vistron, acrylic resin) and "Varyalon" [trade name, manufactured by Asahi Kasei Corporation, Saran (part name, manufactured by Asahi Kasei Corporation, raw material vinylidene chloride resin film laminated with polyethylene film on both sides. For example, Valex film A (r
) /< Indicative of the degree of IJ carbon dioxide gas that permeates per 100 x (2-54 cm) 2 in 24 hours through a 1 mil thick film at 1 atm, 26°C, and 1 Do% relative humidity. The CC number is only 6.1 (Monozanoto M, Salame and Steingis er
cr) data). In addition to the barrier effect, the slow-closing film 8 has a thickness of 50μ to 2F in order to have the effect of welding with the joining ring 4 and reducing the internal pressure of the container as described later.
JUμ9 is a good old man.

The adhesion strength of the internal and external parts of the lid film 6.7 made of such a barrier film is laminated to the container body 5, and the slow-closing film 8 that is bath-bonded on the internal lid film 6. The tensile strength at break and the shear strength at break of the weld layer are generally sufficient to achieve the purpose of the present invention, but when the barrier film is, for example, a barrex film,
The adhesion strength between the film 6.7 on each side of the lid body and the lid body 5 is approximately 25 to 7-/c+11, and the tensile breaking strength of the slow-closing film 8 and the shearing strength of the welded layer with the lid inner surface film 6 are approximately 25 to 7-/c+11. Break 1i) 7 strength is almost equal to 650 Ky/ at room temperature.
At ctn2.50°C, the strength is approximately 60% of that at room temperature, and the strength of the lid body 1 alone constructed in this way is 1+
jJ compressive strength is 12"4'/cm2G (gauge pressure) at room temperature and 9Ky/crWG at 51]'C.

As described above, the lid body 1 according to the present invention is configured with a force? , bottom lid 2. The body filter, the joining ring 4, etc. are not limited as long as they constitute a paper pressure-resistant container together with the lid 1 according to the present invention and achieve the object of the present invention.
A. Examples of these will be explained below.

As an example of the bottom cover 2, the bottom cover body 10' is made of a dry non-woven fabric cloak similar to the cover body 1! It is shown that a barrier film 11 is laminated on both sides of the il-molded product, and its shape is, for example, as shown in FIG. It includes a skirt portion 2b that is fitted and joined to the inner surface of the end portion, and has sufficient pressure resistance, barrier properties, and water resistance similar to the lid body 1.

As an example of the body B, there is shown one in which a laminated paper in which a barrier film is laminated on both sides of one sorted paper material 12 is formed into a cylindrical shape as part or all of the constituent material. The body 6 shown in Figure 1 is a simple 'fL case of the above-mentioned laminated paper wrapped in a single layer, but the body 6 shown in Figure 2 is a case in which the above-mentioned laminated paper is wrapped in 2 layers. In this case, the contact surfaces are welded together while being rolled up. Therefore, in any case, the fuselage inner surface film 13, which ultimately forms the inner surface of the fuselage A, and the fuselage outer surface film 14, which forms the outer surface of the fuselage 6, are provided, and these are covered with a barrier film. Therefore, it not only has barrier properties but also generally has waterproof properties. To give a more specific example, the paper material 12 is a paper made of pulp with a long fiber length, and the paper thickness is 600 μm and the paper weight is 230 μm! 1rlLQ bow 1 tensile breaking strength vertical is 460 Ky/crA, horizontal is 280 g/c
rN, with a thickness of 65 μl on both sides of this paper material 12.
The length of the tube is 180 mm, which is made of laminated paper laminated with Parex film, which is twisted twice while the contact surface is bathed.
A paper body filter with an internal diameter of 70 mm is shown. The independent pressure strength of this fuselage B is 8 at room temperature (7/c+WC) +5
6 Ky/cr at 0℃? +G.

It is preferable that the end faces of the bottom cover 2 and the body 6 be covered with a barrier film as shown in the figure, and subjected to end face treatment to prevent people from getting immersed in water from the end faces.

An example of the joining ring 4 is a cylindrical side wall 4a whose cross section is approximately hook-shaped and fixed to the body inner surface film 16 at the end of the body A, and a cylindrical side wall 4a of the lid body 1 that is approximately perpendicular to this side wall 4a. A seven-ring part 4b having an annular flat part 4° joined to the flat part 1b is shown, and this part is made by injection molding or pressing from slow-closing film 8 and plastic with good compatibility. A member manufactured by molding, 1
This can be considered to be 11 units with 1 resistance. The direction of the flat surface 4c is adapted to match the flat portion 1b of the lid 1t in the joined state. As an example of dimensions of this joining ring 4, the outer diameter of the ring-shaped side wall 4a is 70 mm, and the side walls 4a and 7
Both the thickness of the runno part 4b is 0.5=, 7 runno part 4b
The width of the annular flat portion 4c is 0.5rn, and the width from the flat surface 4c to the end trench of the side wall 4d is 9. In addition to the case where the joint ring 4 is provided with an annular flat surface 4c protruding above the seven run part 4b as shown in FIG.
As shown in FIG. 1, the upper surface of the flange portion 4b is 1'f,
In some cases, a flat surface 4C is formed. Furthermore, as another example, the side wall 4a may be provided at the outer end of the 7-run part 4b so as to be fixed to the fuselage outer surface film 14 of the fuselage 6, or the side wall 4a may be provided at the outer end of the 7-run part 4b so as to be fixed to the fuselage outer surface film 14 of the fuselage 6. There is also an embodiment in which they are provided at both the inner and outer ends so that they are fixed together.

Bottom lid as above 2. Body 6. And the joining ring 4 is assembled as follows. The bottom cover 2 is jointed to the end of one layer of the body A. This connection can be made even stronger by adhesion or welding, by inscribing a rigid ring into the inner surface of the skirt portion 2b of the bottom cover 2, or by tightening the skirt portion 2b and the body slot with mini-rivets. The side wall 4a of the joining linog 4 is fixed to the used end of the fuselage A to the fuselage inner surface film 16 of the fuselage O as shown in FIGS. In this way, an open container with a paper bonding ring to which the lid 1 according to the present invention is attached is obtained.

The method of attaching the lid 1 according to the present invention is carried out as follows. First, for example, when the open container is filled with beer that has been cooled to around 5 degrees Celsius in about 95 holes, the beer foam that forms on the surface overflows from the joining ring 4 fixed to the upper end of the body. When the lid 1 is quickly turned over in a pouring state, the planar association film 8 attached to the bottom surface of the lid 1 comes into contact with the beer foam and discharges excess foam out of the container. 1
The space between the upper beams that comes into contact with the liquid beer in the overturned container is filled only with beer foam, and almost no air is mixed in.
/1 not there. In this state, the contact surfaces of the flat portion 1b of the lid 1 and the flat portion 4c of the joining ring 4 are firmly joined. This bonding (1) can be easily performed by pressing an annular ultrasonic horn having the same diameter as the contact surface from above the lid 1 and applying ultrasonic waves for about 1 second. Although the lid body 1 has a shape having an outwardly convex spherical portion 1a, it can be attached to a non-FiW device containing beer without introducing air.

The above-mentioned 9-hole wearing body 1 according to the present invention exhibits the following effects depending on its structure.

Beer filled at a low temperature gradually rises in temperature by absorbing heat from the outside air through the walls of the container, and when it reaches room temperature, carbon dioxide gas dissolved in the beer generates internal pressure, increasing the pressure of the container by 2 to 2. 5
Ky/crAG is reached, and therefore, the total load exerted by this pressure on the surface of the continuous film 8 reaches about IUOKy when the diameter of the linked film B is about 70 mm. However, the increase in the internal pressure of the container progresses slowly, and as will be explained below, the stretchability of the barrier film constituting the closing film can sufficiently tolerate the deformation that occurs in the linking film 8. As shown in FIG. 2, as the air 9 sealed between the inner surface film 6 of the lid 1 and the linking film 8 is compressed, the slow closing film 8 deforms into a spherical shape. Even if this deformation progresses further than the state shown in Fig. 2 and comes into close contact with the inner surface of the lid, the raccoon rate will be normal unless the spherical part 1a has an extremely small radius of curvature. Since the deformation progresses slowly, the linked film 8 has sufficient stretchability to allow such deformation, and there is no risk of breakage. For example, barrex film is an amorphous thermoplastic resin with a tensile elongation at break of 50 or more. The temperature of the beer in the container is further increased from the above room temperature to, for example, 50°C.
When it reaches , the internal pressure is about 5KyA%.

As K rises, the 6 idr ton given to the linkage film 8 becomes approximately 200Ky, and the deformation of the linkage film 8 progresses further, but at this point the deformation stops. The reason why the slow-closing film 8 deforms and stops at the point where it deforms in response to the temperature inside each container is as follows. In other words, while the sealed constant air ψ tries to expand according to the row width, the deformation of the associated film 8 progresses and tries to reduce the space between it and the curved film 6 inside the lid, and the Boyle 7 Yard Air pressure is generated according to the law. As a result, the slow-closing film 8 absorbs a portion of the internal pressure on the beer side as internal stress, and is balanced at the deformation supported by the air pressure on the back side. Therefore, the internal pressure is equivalent to the pressure caused by beer, but the internal pressure is absorbed as internal stress, not the internal pressure generated by the beer in the pressure received by the inside film 6 as the pressure of the lid body 1 in effect. This is the pressure of air 9 after subtracting the amount of air. When the temperature inside the container, which has once risen, falls, the internal pressure also decreases, and the slow-closing film 8 becomes relaxed only by the permanent stool, but this does not affect the quality of the beer in any way.
stomach.

Due to the action of the slow-closing film 8 as described above, the lid 1 has the following effects. That is, the height of the valley-a to which the lid body 1 is attached is, for example, 5L, which is possible under normal circumstances.
Since the slow-closing film 8 does not break down due to internal pressure even at 8 degrees l'C, the air 9 inside the spherical part 1a of the lid 1 is sealed by the slow-closing film 8, and the lid 1 At the time of installation, no air is brought into the container, and furthermore, since the slow-closing film 8 is a barrier film, it is virtually possible for air 9 and carbon dioxide to pass through the slow-closing film 8 and mix with each other. Therefore, the beer inside the container is completely shielded from contact with air, and the diffusion of carbon dioxide gas is also prevented, so that the flavor of the beer will not be impaired even if it is stored for a long period of time.

Also, part of the internal pressure due to the beer in the container is caused by the slow-closing film 8.
The pressure is absorbed by the gas, and the reduced pressure is applied to the inner surface film 6 of the lid body (see below, this effect is referred to as the depressurizing effect of the slow-closing film 8).

Therefore, in the lid 1, the slow-closing film 8 weakens the effective pressure acting on the bulb part 1d, thereby increasing safety by supporting the tensile breaking strength of the paper lid, which is weaker than that of the metal lid. It is. If this effect is important, use the slow-closing film 8.
It is better to have a thicker thickness, but if the tensile breaking strength of the lid is sufficiently high, such a thickness is not required. It is sufficient if it is appropriately defined as a cypress.

The lid 1 according to the father's book exhibits excellent pressure resistance as described below when attached to an open container with a joining ring as in I Kanki to form a sealed container for beer or the like. As shown in Figs. 1 and 2, the lid body 1 has a spherical portion 1a that is convex to the outside.
As part of its special design, it has a structure in which a barrier film 6.7 is laminated on both sides, so even though it is made of paper, it has a certain degree of pressure resistance. In addition to the structure of the lid 1, a slow-closing film 8 is vertically laminated on the inner surface film B of the lid 1 over the entire surface of the flat portion 1b of the lid 1.
Furthermore, by adopting a structure in which the flat parts 1b near the peripheries of the four sides of the lid body 1 are stretched like the skin of a large drum, the internal pressure of the container 1 increases and the body 1 remains stable even under the pressure. The shape near the flat portion 1b hardly changes. -10,000, the end of the body 6 is 1-
1] It is fixed to an annular joining ring 4 which can be regarded as a body. In such a container, even if the internal pressure increases and the container expands outward, the shape of the lid body 1 near the flat part 1b hardly changes, and the shape of the lid body 1 remains fixed to the end of the body filter. Since the joining ring 4 has a hardness that is considered to be a rigid body, the shape of the joining ring 4 does not change at all even when the internal pressure is applied to the body A. Therefore, the joining between the flat part 1b of the lid body 1 and the flat surface 4c of the joining ring 4 is There will be no deformation of the parts or any action that will cause delamination due to contact with the joint surfaces. Therefore, the internal pressure acting on the lid body 1 moves the lid body 1 toward the body 6 in the direction of the cylinder axis X of the body B.
Even if it acts as a tensile load trying to pull it away from the surface, its direction and direction will act equally on the joint, so the adhesion force and joint area around the i60 part will be reduced, as will be explained next with a specific example. Even if the adhesion force is small, the total adhesion force can sufficiently resist the tensile load.

For example, as exemplified above, the adhesion strength of the dry nonwoven fabric mat welded to the lid body 5 as the lid inner surface film 6 is relatively low at approximately 25 KyAA, but the width is 4 m, m, average. Diameter is 701==
.

The total adhesion force between the lid body 5 and the lid inner surface film 6 in the yield zone formed by the flat part 1b of is 220 Ky, and the container internal pressure is 5 KP/c%G (equivalent to a tensile load of about 64 to 9). Even if the lid inner surface film 6 reaches the lid body 5, the lid inner surface film 6 will not be separated from the lid body 5. Regarding the adhesion of the joint between the flat part 1b of the lid 1 and the flat surface 4c of the joint ring 4, for example, the structure of the continuous film 8 forming the surface of the flat part 1b of the lid 1 and the joining ring 4. When both materials are barrier resins and are bonded by bath coat, the adhesion strength of the bonded portion is approximately 700 Kg1/CM at room temperature and approximately 4 at 50°C.
Since it is a 20 Ky/c seedling (60% at room temperature), the dimensions of the joining ring 4 are, for example, as shown in the example above, such that the height of the flat part is L.
When the diameter (approximately equal to the outer diameter of the side wall 4d) is about 70-, the total adhesion force is about 770 Ky at room temperature.
, about 460 Ky- at 50°C. The tensile load on the lid 1 due to the internal pressure of the container acts equally on this joint as described above, so even if the safety factor of the total adhesion force is taken as 2, it can sufficiently withstand an internal pressure of approximately 5 Ky/crdG. be.

Furthermore, the lid 1 according to the present invention can be fully opened. That is, when opening the container, place your finger on the peripheral edge 1c of the lid 1 and lift it upwards to open the container at 1 of the peripheral edge 1c.
When a concentrated load is applied to a portion, the peripheral edge 1c to which the continuous film 8 is not attached is more easily deformed than the inside of the flat portion 1b, so if it is greatly deformed with a force of about 10 Ky, the flat portion 1b and The outer end of the joint with the flat part 4c of the joint ring 4 breaks, a crack instantly runs around the entire circumference, and the lid 1 opens fully with a pleasant sound. If the peripheral portion 1c forms a skirt portion as shown in FIGS. 1 and 2, opening will be easier due to the action of a lever. The opening of lid body 1 is for women.

Even children can easily do it.

In addition, the structure of the lid body 1 that relates to the present invention is relatively 1'ili @
↓ Therefore, it is easy to manufacture and the manufacturing cost is low.

As explained in detail, M II I related to non-invention
V, f, slow-closing film 8 made of barrier film
By employing a structure in which the air 9 inside the outwardly convex spherical part 1a is sealed, the spherical part 1a is adhered in a planar manner to the flat part 11) located in the center part 1lIII of the peripheral part 1c. In the middle film 8 (1) Is it a sphere that can be said to be the fate of the lid body that forms a spherical shape?〈Part 1
(11) The effective gas on the side of the body 6, such as a ball of carbon dioxide, is
(iiD) The film on the flat part 1b of the lid body 1 is formed to have a thickness sufficient to increase the adhesion force with the joining ring 4 attached to the end of the body 6. , (IV) By applying the internal pressure of the container to the continuous film 8 having the air 9 sealed behind it to maintain a balance between the internal pressure and the compressed air 9, breakage of the slow-closing film 8 is prevented, A part of the internal pressure of the container is absorbed as internal stress of the continuous film 8, and in the reduced pressure state, it acts indirectly on the bulb part 1a to prevent the bulb part 1a from breaking. Due to these functions and effects, the lid according to the present invention, which is manufactured from a paper format that has a much lower tensile strength than aluminum etc., has excellent pressure resistance and retains the flavor of the contents, and also has a bonding ring. Since there is no continuous film reinforcement on the outside of the joining part, it is easy to fully open the opening by applying force to this part, and it has many advantages such as easy manufacturing and low cost.

The present invention will be further explained below with reference to Examples.

Example: Made from pulp fibers mixed with fibrous low-density polyethylene at a weight of 25% by air-laying method! J! A dry non-woven fabric cloak (manufactured by Honshu Paper Industries) was used as a paper material, and it was hot-pressed into the shape shown in Figure 1 with a thickness of 1.5 mm.
The lid body is heat-formed, and a barrettes film with a thickness of 65μ9 is coated on both sides (tensile strength at room temperature is 650 KP).
/cm, the strength at room temperature at 50°C is about 60, and the shear breaking strength of the welded surfaces of the films is the same as the tensile breaking strength at room temperature and 50°C, respectively. Furthermore, on the flat part of the inner surface, a continuous film made of Barenox film with a thickness of 100 μm is overlaid on the inner surface film of the upper lid body and adhered by welding to form a sphere. A lid body according to the present invention was obtained by beating as shown in FIG. 1 with a radius of curvature of the hard part of 6 LIrML and a width of the flat part of 4 mxL. The tensile breaking strength of a test piece obtained in the same manner as the lid body above was 250 K9/c, and the pressure strength of the lid body alone was 12 KF/aC at room temperature and 9 "J'/cr?+ at 50°C.
It was G.

- Laminate the same 35 μm thick BAL/SOX film F laminate on both sides of the bottom lid body, which is made from the same paper stock using a hot press in the same way as the lid body. The radius of curvature of the ball part is 66cm, the length of the skirt part is 10m
A bottom cover as shown in FIG. 1 was obtained. The pressure resistance of this bottom cover alone was also the same as that of the lid body. In addition, as a paper material for the body, sorting (paper thickness 30 (Jμ milk 2) consisting of bulbs with long fiber length)
Paper ore quantity 260, 7/c penetration, tensile strength at break jJ A 60
KyArA + 1j4280 Ky/crA) was used, and laminated paper laminated with 35 μ milk Balenox film on both sides was layered in a cylindrical shape, and then re-wound while bath-coating. 18Qmx, inner diameter 70rr
Lm.

A body made of Qa paper as shown in FIG. 2 was obtained. The compressive strength of this single piece is 8Ky/cIIM at room temperature and 6Ky/cIIM at 50℃.
It was Ky/craa. In addition, the joining ring is made by injection molding Valesox resin, and the four diameters of the ring-shaped side walls are 70 mm.
=.

The thickness of the side wall and the flange part are both 0.5=-, the width of the annular flat surface of the flange part is 0.5=, and the width from the flat surface to the end 1 of the side wall is 9=9. A joining ring with a cross section as shown in was obtained. Fitting the joining ring onto the inner periphery of the upper end of the body and the skirt portion of the bottom cover onto the inner periphery of the lower end of the body,
Each was heated and coated in a bath to form an open container with a joining ring.

Fill the above open container with beer at 5°C until it reaches 95φ-, then cover it with the lid and apply an annular ultrasonic horn set to 1 fl 1 min to bond with a surface pressure of 15 Ky/c+.
At n, ultrasonic waves were applied to the cover 20 from above at a frequency of H2 for 0.6 seconds to weld the flat part of the lid and the flat part of the joining ring to make a completely airtight container. No air was allowed to be brought into the container during the work. After leaving it at room temperature for one month, it was served for drinking, and the flavor was not impaired in the slightest.

Separately, a sealed container with a diameter of 5 mIn was placed in the center of the bulbous part of the bottom lid of a sealed container obtained in the same manner as above except that no beer was added.

A hole is made in the container and room temperature water is pressurized into the container.
The pressure inside the container was gradually increased at a rate of G/hour. The container was left to stand for 6 hours at a temperature of 5 K7/c+ΔGVC, but no water leakage from the container was observed and no breakage occurred. After this, the water in the container was drained, and when the intangible body was pulled up by placing a finger on one end of the lid body, the lid body peeled off from the joint ring on the body side with a bang sound with a force of about 10 KyO. When the related film attached to the lid was inspected in this state, no damage was found on the film surface.

From the above results, the original thickness is 100 μm and the diameter is 70.

If the periphery of the Valenox film is fixed, it will break if an internal pressure of 5 Ky-/c + WG (W load 192 Ky) is applied for a short time, but if the pressure increases slowly, the related film will deform into a ball shape. The air sealed between the ball and the rolling part is compressed to create a back pressure, which is balanced in a certain intermediate state and prevents the associated film from breaking, and in this way the associated film remains unbroken. The paper lid according to the present invention has a bulbous part for increasing pressure resistance. It prevents contact between the air inside the bulb and the beverage, achieving both surface pressure and flavor retention, and also makes it easier to open the full oats.
This will greatly contribute to improving the performance of paper pressure containers.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view of an example of a paper pressure-resistant container constructed using one embodiment of the lid according to the present invention, and FIG. Kakatsu fc'ilJ
FIG. 6 is a partially enlarged sectional view of an example of a joining ring to which the lid according to the present invention is joined. 1... Lid body 1d... Ball part - 1b... Flat part 1c... Peripheral part 2... Bottom cover 2a... Ball part 2b... Skirt part 6...) 1 Same part 4... Joining ring 4a...Side wall 4b...Flange portion 4c...Flat surface 5...Lid main body 61. Barrier film (internal film) 7...
Barrier film (vessel exterior surface - y film) 8... Slow closing film 9... Air 10... Bottom lid body 11... Barrier film 12... Paper stock 13... Body inner surface film 14... Body outer surface film X... Cylinder shaft Figure 1 Figure 2 Figure 3 Procedural amendment July 25, 1980 Manabu Shiga, Director General of the Special Correction Agency Display of case 14 1982 Patent Application No. 75267 2, Title paper of the invention Manufactured Pressure Container Lid 3, Relationship with the Amendment Case Patent Applicant Address 1-2-6 Dojimahama, Kita-ku, Osaka-shi, Osaka Name
(003) Teru Miyazaki, Representative Director and President of Asahi Kasei Industries, Ltd. 4, Agent 100 Address 1-4-56 Marunouchi, Chiyoda-ku, Tokyo, Claims column 9 of the specification subject to amendment We have amended the points listed in L in the explanation column and brief explanation of drawings column 7, and the detailed description of the amendment.J-3, (1) No. 1@
The claims on lines 11 to 17 have been amended as shown in the attached sheet. 1-0 (2) The word "change" in the bottom line of page 5 has been amended to read "transformation." (3) Page 7, line 1, 1 on both sides of the lid body made of paper. At least one side of the lid body made of JI.'' (4) The following sentence will be added between page 7, line 10 and line 11. [The embodiment shown in the drawings below is a preferred embodiment of the present invention, in which both sides of the lid main body are laminated with Paris-X7-resistant film; Only one of the outer surfaces may be covered with a waterproof film, but the barrier film may be laminated only on the outer surface of the lid body.
(If the lj continuous opening/closing film is attached, it is necessary to cover the inner surface of the flat part with the barrier film.) (5) Page 8, lines 7 to 11, the barrier film 6.7 is on both sides. ... (referred to as the lid outer film 7)" is replaced with "a film 6.7 is laminated on both sides (hereinafter, the film laminated on the inner surface of the lid body 5 is referred to as the lid inner film 6,
The film laminated on the outer surface is referred to as the lid outer film 7. (In this example, both are barrier films.) (6) Page 9, line 3, "There is no problem. If the inner surface film of the lid body 6 fJ" does not have barrier properties, then the outer surface film 7 of the lid body does not have barrier properties. 7) Page 12, 2nd line [Although it is sufficient, the word 1 has been replaced with "1". Although it is sufficient (the inside and outside of the lid body are uneven, one side of 7 is a waterproof film and the same is true for -C. I will correct it to -1. 8) Page 21, line 1 " I added the following sentence next to "It's enough if you decide." J: Sun. ``In addition, the above effects can be achieved without any effect on the barrier film A7 (even if it is only the external film 7, there will be no effect).
This is the effect of being q. 9) Page 121, lines 5 to 7, "As shown in Figures 1 and 2... are laminated."
The statement [M-body 1 has an outwardly convex spherical calyx portion 1a - (at least on one side of it is laminated with a barrier'') is corrected as follows. 10) No. 31 Page 7th to 8th lines [6... Barrier film (lid inner surface fill \) 7
・・Barrier film (M external body film)” 2 will be corrected to 6. Lid inner surface film 7. External body film. 1 A paper lid body (to be joined to a joining ring (4) fixed to a paper body (3) to constitute a paper pressure-resistant container)
1), in which at least fi~ of the lid main body (5) made of paper
Bali A fushi 4 oil l on the side (6) or (7) lf
It is laminated and has an outwardly convex spherical part (1
a) and the flat part for joining the joining ring (1b
), and a continuous film (8) made of a barrier film is stuck to the flat part (1b) in a state where the sphere is honeymooned with the air (9) inside part (1a). A useful body for a paper 11FI pressure vessel, which is characterized by: -21'

Claims (1)

[Claims] 1. A paper lid body (for forming a paper pressure container by being joined to a joining ring (4) fixed to a paper body (3))
1), with barrier films (6) on both sides of the paper lid body (5). (7) is laminated with a ball part (1a) that is convex outward in the center, and a flat part (1d) for joining the joining ring where the ball is continuous with the part (1d) on the inner side slightly near the center along the periphery. A slow-closing film (8) made of a barrier film is stuck to the flat part (1b) in a state where the air [9] inside the bulbous part (1a) is sealed. A lid for a pressure-resistant container made of paper, characterized in that it consists of a structure.