JPS61127438A - Can-shaped vessel cover - 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] [Industrial Application Field] The present invention relates to can-like container lids, and in particular cans that can be opened without the need for an auxiliary tool such as a can opener for can containers such as various beverage cans and can containers, and for containers similar to steamers. The present invention relates to a lid for a container for seedlings, and particularly to a can-like container lid that is easy to open and has improved strength to break the can when dropped, which is a property contradictory to easy opening.

[Conventional technology]

The inventors have shown a plan view of the lamp in Figure 5.

In Japanese Patent Application No. 58-124756, we proposed a seedling container as illustrated in FIG. 61, which is an enlarged sectional view taken along the line X-X'@ in FIG.

As shown in Fig. 6, this can-like container lid is made of a metal foil, sheet, or film substrate 1 that is impermeable to oxygen, water, etc. Resin layer 2
It also has a base material (hereinafter referred to as a multilayer base material) 4 having a resin layer 3 on the other surface (upper surface), and nine resin layers 5 laminated on the surface of the multilayer base material 4.

The can-like container lid constructed in this manner is attached to the body of the seedling container, as shown in FIG. That is, Fig. 6 (
As shown, the resin layer of the multilayer base material 4 of the lid 6 is heated and melted and attached to the body 7 of the seedling container. FIG. 7 shows an example of a seedling container to which such a can shuttle container lid is attached,
In FIG. 7, 6Fi indicates the lid, 7 indicates the body, and 8 indicates the bottom. The body 7 is filled with foodstuffs such as canned food, soup, soft drinks, etc. after being sterilized in a retort, and then transported to the product distribution process.

As mentioned earlier, the can-like container lid 6 has a multilayer base material 4.
The resin layer 5 is laminated on the surface of the lid, and the present inventors first fabricated the can-like container lid by integral molding (
We succeeded in obtaining a product (molded at IFt1).

That is, conventionally, as a method for making such a can-like container lid, *zPt1 having a glassy layer on both sides and a resin sheet made in advance by injection molding are prepared separately, and these are bonded with an adhesive. In some cases, post-adhesion (hereinafter referred to as "post-adhesion") is used, but this method increases the number of steps and increases costs; To wake up ■Made fcl! There were six drawbacks, such as the drop strength of the product being poor and the use of adhesives, which could pose food hygiene problems. Therefore, the present inventors inserted the multilayer base material 4 into the mold of an injection molding machine in advance, and then injected resin to form a 5' ft resin layer and integrally molded it by injection molding. However, in this case, the multilayer base material (insert material) sometimes misaligned during the molding process, making it difficult to obtain a highly accurate product. However, it was discovered that by inserting and fixing the insert material into a guide member equipped with a gold WIK, it was possible to obtain an integrally molded product by high precision injection molding without the above-mentioned positional misalignment, and filed a patent application earlier (% addition 58
-90749).

As a result, ■ the number of steps is shortened; ■ the molded product has high adhesion strength, so it does not peel off during retort processing, etc.; ■ the product has high drop strength, and the seedling container has excellent food hygiene. succeeded in obtaining the lid.

By the way, in such a can-like container lid, the ease of opening the lid is 11r.

In the lid previously proposed by the present inventors as shown in FIGS. 5 to 7, the unsealing portion 9 and the portion other than the unsealing portion (#F outer peripheral portion-##) 111 are As shown in FIGS. 5 and 6, they are separated via a notch 11.

That is, as shown in FIG. 6, the resin layer 5 is laminated on the surface of the multilayer base material 4, and the cutout part 11 is a part where the surface of the multilayer base material 4 is exposed to the outside, and serves as an open part. The opening part 9 and the outer peripheral part 10 of the convex part laminated on the surface of the multilayer base material 4 are partitioned and separated.2 In this way, in the lid, the notch part II is Since the unsealing portion 9 and the outer circumferential portion 10 are separated through the opening, the unsealing can be easily opened.

That is, to explain how to open the lid, insert your fingertip into the groove 12 and lift the handle part 13.
: is peeled off from the multilayer base material 4, the tip of the handle part 13 is wedged inside the multilayer base material 4 at the position 14 shown in FIGS. 5 and #6, the multilayer base material 4f is cut, and the handle part 15' When the multilayer base material 4 is pulled as it is, the multilayer base material 4 is cut along the cutout portion 11, and the lid of the container is opened.

FIG. 8 shows a plan view of the lid after opening, and FIG. 9 shows an enlarged sectional view taken along line Y-Y' in FIG. 8 after opening. In this way, the lid is designed to be easy to open by separating the opening part 9 and the outer peripheral part 10 through the notch 11. The entire or partial portion of the portion where the back surface of the handle 15 of the unsealing portion 9 and the multilayer base material 4 are in contact with each other (the handle portion 13 is subjected to a treatment for easy opening from the multilayer base material 4. In Figure 6, as an example of such a process, printing ink is applied to form the treated layer 1.
An example in which 5t is provided is shown. That is, since the resin forming the resin layer is injected into the multilayer base material by injection molding, the adhesion strength between the multilayer base material and the resin layer is high, and therefore a molded product with high product drop strength can be obtained. In this case, even the handle of the lid is tightly attached, and the handle may not separate from the lid body. Therefore, in consideration of ease of opening, a treatment layer for easy opening as described above is provided.

[MA while the invention is being solved]

In this way, the present inventors have developed a product that has excellent retort characteristics, food hygiene properties (excellent, good formability, complete incineration, low cost, and excellent opening properties and high drop strength). Developing a can-like container lid with (successfully)
The present invention further provides a lid for a can-like container that has both characteristics, that is, has excellent opening properties and high product drop strength. The purpose of the present invention is to provide a can-like container lid that can pass the product drop strength stipulated in legal standards (Ministry of Health and Welfare Notification No. 20), which is a major obstacle when it comes to coverings.

[Means to solve the problem 'fr]

By the way, the present inventors previously conducted a drop test and CA D (
When the mechanism of can breakage when a can is dropped was elucidated using Computer Aided Dvsign (an automatic design system using a computer) and high-speed camera photography, the following findings were made. In other words, when looking at the relationship between the width of the notch in a can-like container lid as shown in Fig. 5, ease of opening, and can breaking strength, it is generally found that the width of the notch is narrower than the width of the notch. It is thought that the withstand strength increases, but in fact, the opposite is true; the wider the width of the notch, the greater the energy absorption when the can is dropped, and the greater the can breakage strength. Regarding ease of opening, it is the opposite of the above, and it is generally thought that the wider the notch, the better the opening is, but in fact, the opposite is true: when the width of the notch is wide, the multilayer base material tends to stretch, making it easier to open. It was found that it significantly interfered with sexuality.

Based on the above findings, the present inventors previously narrowed the width of the notch to a region that does not affect the ability of the lid to open the can, and narrowed the width of the notch to the area that does not affect the ability to open the lid. In this process, a heat-meltable resin layer is formed on one side of a base material such as a powder sheet, water-impermeable metal foil, sheet, or film, and a notch is formed on the surface of the base material, that is, a multilayer base material. In a can-like container lid formed by laminating a resin layer consisting of a part with a handle part, that is, an opening part, and a part other than the opening part, that is, an outer periphery, the outer periphery, K, and the surface of the multilayer base material. The lid of a can-like container is characterized by having an exposed portion.

Next, the present invention will be explained in detail.

In the can-like container lid according to the present invention, by providing a portion where the surface of the multilayer base material is exposed on the outer periphery, even if the lid is pressed from inside by the contents filled in the container, the exposed portion will not be covered with resin. The layers are laminated (adhered) and therefore elongate in the multilayer base material, which has a buffer effect against the internal pressure.Also, even if the can is dropped, the exposed area absorbs the energy of the dropped can. To provide a can-like container lid that can absorb water, exhibit a buffer effect, and improve can-breaking strength, and, in combination with the presence of the narrow notch, is easy to open and has excellent can-drop strength. I can do it.

Next, the present invention will be explained based on drawings showing a few examples thereof. FIG. 1 shows an example in which the present invention is applied to the lid of a can-like container shown in FIG.

As shown in FIG. 1 (16 is the exposed portion of the multilayer base material 4 provided at the outer peripheral portion IO), and as shown in FIG. ft laminated chair, the surface of the multilayer base material 4 is exposed.

In this example, the exposed portion +6 is placed at S locations (1
An example is shown in which 6 people, 168, 160) are provided. FIGS. 3 and 4 show modified examples of the can-like container lid of the present invention in which the shape, size, arrangement position, and other patterns of the exposed portion are variously changed. In Figure 3, 1e 辷 = Toshigo, in Figure 4, 1
Numbers 9 to 19 show seven of the exposed portions.

Next, the present invention will be explained in detail. In the present invention, the exposed portions of the multilayer base material may be provided partially in the outer circumferential portion 10, and in the example shown in FIG. Only the fc misting part 16C is provided, and the exposed part +6A provided inside it.
.

The resin layer 5 may be laminated on 16B, and pressure may be applied so as not to expose the multilayer base material and the surface.

In this case, a treated layer (not shown) similar to the treated layer 15 for the purpose of easy peelability is interposed between the resin layer 5 and the surface of the multilayer base @4. Since the exposed portions 16A and 16B are coated, it is possible to prevent the multilayer base material 4 from being torn if a sharp object comes into contact with it, and the resin layer 5 can be prevented from being torn. Even if the multilayer base @4 is laminated on the exposed parts +6A and 16B, the above-mentioned treatment layer prevents the adhesion between the multilayer base material and the resin M5. can be played.

In the above case, it is preferable that the treated layer and the exposed portion 460 are continuous, and if there is a resin layer in close contact with the multilayer base material between them, it is difficult to achieve the above effect.

Examples of such treated layers include a layer treated with printing ink, as well as Japanese Patent Application No. 58-12475 filed by the present applicant.
Examples include those listed in No. 6.

In the present invention, as described above, a portion where the surface of the multilayer base material is exposed is provided on the outer periphery, or at least a portion of these portions is coated with a resin layer with a treatment layer interposed therebetween, thereby achieving a buffer effect or A means for preventing the exposed portion from tearing will be described, but as a second invention of the present invention, a thin film-like resin layer may be layered on the exposed portion.For example, the thickness is 500 microns or less, preferably 300 microns. Layer the following film-like resin layer.This is K.
Similar to the case where the resin layer is coated with an exposed part or one layer interposed, the multilayer base material stretches and has a buffer effect, and at the same time, the exposed part is covered with the resin. This prevents it from breaking even if a sharp object comes into contact with it.

Furthermore, the present inventor has found the following regarding the can-like container lid of the present invention, which will be explained below.

In the present invention, as described above, when opening the lid (to do so, insert your fingertip into the groove 12, lift up the handle 13, and place the tip of the handle 13 on the multilayer base material at the position of the tip 14 of the handle +3). 4 is wedged inside, and the lid is opened along the notch 11, forming an acute triangular shape. , it is said that it is good to configure the notch 11 to have a width as narrow as possible, and in the embodiment described above, the notch 11 is made narrow.! In particular, in the above-mentioned Japanese Patent Application No. 146945/1987, the notch We proposed that the width of the section be made narrower in the area that affects opening of the lid, and that the width of the area be made wider than the aforementioned area without affecting the opening of the lid.

However, as shown in the seventh factor, the can-like container lid 6 is attached to the body 7 to configure the seedling container, and the seventh (nine) When we investigated the vertical drop strength when the seedling container shown in Fig. 1 was turned upside down and dropped with the surface of the lid facing downward, we found that the notch 11 shown in Fig. 1
Among them, the notch 11A near the tip position 14 of the handle part 13
.

It was found that the inner notches 11B% and 110 had such vertical drop strength. Therefore, as shown in FIG. (Layer 5 may be scraped off), as shown in the same figure, by making it into a good rounded shape, this vertical drop strength is improved, and furthermore, the 10th layer
As shown in the figure, it was found that even if the area of the notch 11 was widened, it did not affect the unsealability (contrary to the original plan).

FIG. 11 shows a modification of the square can lid of IWI with improved vertical drop strength.
An example is shown in which the resin layer 5 is not laminated (the resin layer may be scraped off) on the outside of the blind line connecting the line and the fulcrum 13B, and the protrusion 20 is provided at the center of the @ line.

Furthermore, in the above, when combined with the exposed portion of the multilayer base material, not only the vertical drop strength can be improved, but also the diagonal drop strength when the seedling container is dropped diagonally. For example, as shown in FIG. 10, by combining the exposed portion 160 of the multilayer base material shown in FIG. It can absorb the energy of falling falls and improve the strength of diagonal falls.

Furthermore, as described above, due to the expansion of the area of the notch 11A), if the area is deformed, the surface of the notch 1
As shown in FIG. 10, it is advantageous to provide a rib 21 for reinforcing the rib 21 between the exposed portion 160 of the multilayer substrate 1 and the exposed portion 160 of the multilayer base material.

The width of the notch 11 in the present invention is preferably 0.8 m or less.

Examples of substrates used in the present invention include metal foils, sheets, films, and the like. These base materials need to be impermeable to water, water, etc. (hereinafter referred to as gas barrier properties). A typical example of metal foil is aluminum i (hereinafter simply referred to as aluminum foil).
This invention relates to a can-like container lid made of this aluminum foil as a gas barrier base material. Examples of other gas barrier substrates include sheets and films of saponified ethylene-vinyl acetate copolymers, polyvinylidene chloride, polyamides, polyacrylonitrile, and the like.

The multilayer base material used in the present invention is one in which a Klfll resin layer (hereinafter referred to as the first resin layer), that is, a heat-meltable resin layer is formed on both or one side of the gas barrier base material.

The first resin layer may be formed on both sides of the gas barrier substrate, but the resin layer (hereinafter referred to as the 20th resin layer) laminated on the multilayer substrate may be formed on both sides of the gas barrier substrate.
resin layer) and the first resin layer (outer layer) on the side to be welded.
can also be omitted. When the first resin layer is formed on both sides of the gas barrier base, the outer layer of the first resin layer is thermally fused to the second resin layer to form a highly adhesive tatami mat, and the other The first resin layer (inner layer) is heat-sealed to the body of the container to attach the lid to the body.

On the other hand, in the case of a gas barrier base material in which the first resin layer is formed only on one side (inner surface), the second resin layer is laminated directly on the base material (outer surface), and the second resin layer is laminated directly on the lower surface (inner surface). The first resin layer is thermally welded, and the lid is attached to the body.@ As the resin constituting the first resin layer, a resin that melts in a hot bath, typically a thermoplastic synthetic resin, is used. Ru. When forming (laminating) the first resin layer on the gas barrier substrate, it can be laminated with or without an adhesive resin layer such as an adhesive or a hot melt adhesive in the form of a film.

In the present invention, the thickness of the first resin layer constituting the multilayer base material is 100% on one side in relation to ease of opening, drop strength when made into a product, strength against can breakage, and strength against breakage during insert molding.
The thickness of the gas barrier substrate such as aluminum foil is preferably 50μ or less, preferably 9 to 50μ. In addition, in the I/C of the present invention, complete incineration can be achieved by selecting the thickness of the multilayer base material, particularly the thickness of the metal foil, for example, aluminum foil. In recent years, the problem of can pollution has been raised, but by considering the thickness of aluminum foil, the resin material of the multilayer base material, etc., it is possible to completely incinerate cans.

Also, the calories burned are 5000-6000 Kca//k)
By lowering K, the problem of can pollution can also be solved.

The can-like container lid of the present invention can be obtained by using the multilayer base material described above and laminating resin on the surface thereof by injection molding. As the resin constituting the second resin layer, the same resin as the resin constituting the first resin layer is used. A preferred example of injection molding is to use a robot for inserting the base material,
The base material (insert material) is fixed in the mold in advance.

Injection molding may be performed, and it is even more preferable to use the method described in the above-mentioned Japanese Patent Application No. 58-90749 filed by the present applicant.In the present invention, the second resin layer is formed by injection molding. Inorganic light*All may be mixed with the resin constituting the injection resin.

Mixing inorganic fillers has the following advantages.

0 The dimensional stability of the seedling container (can-like container lid) is improved and the shrinkage rate is reduced, which is advantageous when attaching the lid to the container.

■ Improved heat resistance and increased heat distortion temperature, which is advantageous for retorting.

■ Burned calories are reduced and combustion furnaces are not damaged, which is advantageous in terms of pollution prevention.

■ It can provide rigidity, which is advantageous for product distribution.

■ Good heat conduction is advantageous for retorting.

■ Cost can be reduced.

As the inorganic filler, those widely used in the field of synthetic resins and rubbers may be used. These inorganic fillers are preferably inorganic compounds that have good food hygiene properties, do not react with oxygen and water, and do not decompose during crosstalk or molding. Examples of the inorganic filler include compounds such as metal oxides, their hydrates (hydroxides), sulfates, carbonates, and silicates;
These double salts can be broadly classified into mixtures of these salts. Typical examples of such inorganic fillers include aluminum oxide (alumina), its hydrates, calcium hydroxide, magnesium oxide (magnesia), magnesium hydroxide, zinc oxide (zinc white), red lead, and lead such as white lead. oxide, magnesium carbonate, calcium carbonate, basic magnesium carbonate, white carbon, asbestos, mica, Merck,
Glass fiber, glass powder, glass peas, clay, clay, silica, wollastonite, iron oxide, antimony oxide, titanium oxide (titania), lithopone, pumice powder, aluminum sulfate (gypsum, etc.), silica zirconium,
Examples include zirconium oxide, carbon dioxide, dolomite, molybdenum disulfide, and iron sand. Among these inorganic fillers, those in powder form preferably have a diameter of 20 microns or less (preferably 10 microns or less).

In addition, fibrous materials have a diameter of 1 to 500 microns (preferably 1 to 500 microns) and a length of 0.1 to 6 microns.
wm (preferably 0.1 to 5 cm). Furthermore, it is preferable that the diameter of the flat plate is 30 microns or less (preferably 10 microns or less). Among these inorganic fillers, those in the form of flat plates and lakes and those in the form of powder are particularly preferred.

In addition, in the present invention, the above-mentioned applicant J!
The injection molding method using a multi-point gate described in Japanese Patent Application No. 58-12475/i related to IK, the formation of a treated layer for the purpose of easy opening, etc. can be applied.

Although the method using injection molding was mainly explained above, the lid of the Moecan-like container of the present invention can also be obtained by compression molding. It may depend on the method. As a method of compression molding, for example, an insert material may be inserted into a mold of a press machine, a heated resin sheet or a molten resin may be supplied to the insert material, and press molding may be performed.

Next, the invention! This will be explained based on Example J and Comparative Example.

Example: Using a Toshiba l5-5OA (502) injection molding machine, the third
The tiger molding the round can container lid shown in the figure.

The multilayer base material used was a multilayer base material formed by laminating ethylene propylene block copolymer (1) [VFRl, 1-functional tyrene content: 9 wt %] on both sides of aluminum foil.

Rubber-based gravure printing ink was applied in advance to the corresponding portion of the multilayer base material handle VC#:. This multilayer base material is inserted and fixed by a robot into a stripper plate previously installed in a mold, and injection molding is performed. Regarding the gates, there are two gates on the opening part and the outer periphery, and the notch part 11 and the exposed part of the surface of the multilayer base material are press-cut on the mold.

The exposed part surface # of the multilayer base material surface is 4. It was set as IC1n2.

'/! j fi”-my 240 C1 injection pressure 60
kg/cal second resin binding 7VFR1o, oJ'
/* 0ml Injection was carried out using 1n nophropylene and ethylene block copolymer (1).

In the above, the thickness of the aluminum foil and the first resin layer on both sides is resin (outer layer)/aluminum foil/resin (inner layer) =
70μ/15a/70μ, and the thickness of the second resin layer laminated on this outer layer was 0.7μ.

Using the obtained f′ round can lid, we fuse it with the body to make a can container (content capacity 550 ce wide) - Ministry of Health and Welfare Notification No. 20 (
A drop test was conducted based on a drop height of 50z (passed) and a drop test was conducted by changing the height extremely to 5° o3 or more, and the suitability for opening cans was also observed.

The results are shown in Table 1.

Example 2 A round can shown in FIG. 1 was molded in the same manner as in Example 2. The exposed area of the multilayer base material surface was set to 5°8cNr2. The results are shown in Table 1.

Table 1 I changed the direction of the falling dates.

From the results shown in Table 1, the seedling container test of the present invention was able to clear the legal standards of Ministry of Health and Welfare Notification No. 20, and had good suitability for opening.

〔effect〕

(11) According to the present invention, since a multilayer base surface is exposed on the outer periphery, the drop strength and can breaking strength are improved, and the drop test based on the Ministry of Health and Welfare Notification No. 20 can be passed. .

(2: Since the above exposed part is provided on the outer periphery and the opening part and the outer periphery are separated by a notch, the opening of the can is good and the can can be opened easily without the need for auxiliary tools such as a can opener. It is.

f3+ In addition, the seedling container tester of the present invention has excellent retortability and food hygiene, is low cost, and lightweight.

It has excellent properties such as being completely incinerated.

[Brief explanation of drawings]

5 is a plan view showing another embodiment of the seedling container according to the present invention, FIG. 4 is a plan view showing another embodiment of the can-like container lid according to the present invention, and FIG. 5 is a plan view showing a conventional example. Figure 6 is Figure 5 x - x'
A line enlarged sectional view, FIG. 7 is a perspective view showing an example of a seedling container,
Figure 8 is a plan view of the conventional example after opening the lid, and the ninth cause is Figure 8 Y
-Y' line enlarged sectional view, Fig. 1θ is a plan view of the can-like container lid, and Fig. 11 is a plan view of the can-like container lid. 1... Gas barrier base material 2... Heat meltable resin layer 5... Heat meltable resin layer 4... Multilayer base material 5... Resin layer 9... Opening part 10. ...Outer circumferential part +1 ... Notch part 13 ... Handle part 16A-16G ... Portion 18 where the surface of the multilayer base material is exposed == Shift i ... IA ~ 19g ...

Claims (1)

[Claims] A base material (hereinafter referred to as a multilayer base material) in which a heat-meltable resin layer is formed on both or one side of a base material such as a metal foil, sheet, or film that is impermeable to oxygen, water, etc., through a notch. In a can-like container lid formed by laminating a resin layer consisting of a part with a separate handle (hereinafter referred to as the opening part) and a part other than the opening part (hereinafter referred to as the outer periphery), the outer periphery has a multilayer base material surface. A can-like container lid characterized by having an exposed portion.