JPH09221173A - Vacuum-packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily increase the strength of a flange, by providing ribs parallel to the flange of the whole periphery or the longer sides of a container or bending the front end or inclining the face. SOLUTION: A flange 2 is provided at the whole periphery of a container body 1 and ribs 11 are provided at the whole periphery or parallelly to the longer sides. The container wall of the container body 1 is provided with a tapered face having 2-5deg. against the vertical face so as to stack the containers for automatic heat-sealing, and a horizontal flange 2 at the upper part. When the ribs 11 are provided in advance, the ribs 11 are shaped to form recessed grooves so as to be heat-sealed without hindrance. When the ribs are fitted during the sealing process or after the process, the ribs 11 may have protrusions. When the front end of the flange 2 is bent, the bending width is made within 0.5-3mm and the bending angle is made within 0-50deg. When the flange face is inclined, the flange width is made within 5-12mm and the inclination is made within 10-60deg.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to foods, electronic parts,
Plastic vacuum packaging container or aluminum foil composite material (aluminum foil and plastic) used for storage and transportation by sealing products or parts such as office supplies and home appliances with heat seal, high frequency seal, ultrasonic seal, etc. A vacuum packaging container comprising a laminated foil laminated with a film or a coating foil formed by coating a resin on an aluminum foil).
The present invention relates to a vacuum packaging container that is thin and has no deformation or seal defects after packaging.

[0002]

2. Description of the Related Art In recent years, plastic vacuum packaging containers or aluminum foil composite material vacuum packaging containers have been widely used as vacuum packaging containers sealed by heat sealing or the like. Vacuum packaging containers molded from plastic are widely used because they are excellent in terms of high productivity and easy cost, but often lack rigidity.
There is a drawback that it is easily deformed in vacuum packaging.
Further, the vacuum packaging container formed from the aluminum laminated foil is superior in light-shielding property and oxygen barrier property to the preservability of contents as compared with a general plastic container, but has a disadvantage of high cost. is there. As a remedy for this, it is conceivable to thin the aluminum foil in order to reduce the cost, but when the container made of a thin material is vacuum-packaged, the flange portion is pulled by vacuum as shown in FIG. In some cases, a defective seal could be caused by deformation of the flange. In vacuum packaging, even a slight seal failure causes a fatal defect, and therefore it is necessary to suppress deformation of the flange in vacuum sealing as much as possible.

In order to prevent such deformation of the vacuum packaging container flange, conventionally, a method of curling the flange has been generally used to improve the flange strength. However, in order to carry out curl processing, a curling mold is required,
Further, it is necessary to curl in a step different from the container molding, and the cost merit of thinning the wall may be offset.

Another conventional technique for preventing the deformation of the container is to provide a rib on the bottom surface of the container to prevent the deformation due to a shock such as dropping (Japanese Patent Laid-Open No. 55-154250). A method to prevent deformation by providing convex ribs on the side and bottom of the container (Jaikai Sho 61-35120, Jaikaihei 1)
-76405). A method for preventing deformation due to dropping by providing ribs on the container lid material (Shokai 56-14871). There is a suggestion such as. All of these proposals are intended to prevent deformation by improving the strength of the top surface (lid material) of the container, the side wall surface or the bottom surface of the container. Prevention of deformation by strengthening the flanges related to the seal, defective seal (defect) From the perspective of preventing the occurrence of

If the flange does not have sufficient strength even after the container body or the lid is reinforced as described above, when the lid and the flange are heat-sealed by vacuum packaging,
Since the lid material is strongly pulled inside the container, the flange cannot avoid the tendency to float upward. Therefore, when the strength of the flange is insufficient even if the strength of only the container body or the lid material is strengthened, the flange is apt to be deformed or a seal defect due to the deformation is likely to occur. Therefore, in addition to strengthening the container body, it has been desired to develop a method for improving the strength of the flange portion by a simple means without changing the thickness of the material of the container.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a plastic vacuum packaging container having a flange or an aluminum foil composite material vacuum packaging container in which the flange strength is improved by simple means. For the purpose of provision.

[0007]

The present invention provides (a) a plastic vacuum packaging container having a flange or an aluminum foil composite material vacuum packaging container, which is hermetically sealed by heat sealing, high frequency sealing, ultrasonic sealing, or the like, in advance. Provide ribs parallel to the flange on the entire circumference of the container or the flange on the long side of the container, bend the tip of the flange on the entire circumference of the container or on the long side of the container, and set the flange on the entire circumference of the container or the long side of the container. A vacuum packaging container having any means of inclining the surface, and (b) a plastic vacuum packaging container having a flange or an aluminum foil composite material vacuum packaging, which is hermetically sealed by heat sealing, high frequency sealing, ultrasonic sealing, or the like. At the same time as or after sealing the container for use in parallel with the flange, Providing one or more ribs on the flange on the circumference or on the long side of the container, bending the tip of the flange on the entire circumference of the container or on the long side of the container, and sloping the flange surface on the entire circumference of the container or the long side of the container (C) The width of the ribs provided on the flange is 0.5 to 3 mm, and the height or depth is 0.1 to 3 mm. (A) or (b) (D) The vacuum packaging container according to (a) or (b), in which the tip of the flange is bent to have a width of 0.5 to 3 mm and a bending angle (θ ₁ ) of 0 to 50 °. , (E) The inclination angle (θ ₂ ) of the flange surface is 10 to 60 °
The container for vacuum packaging according to (a) or (b), which is inclined to (1), and (f) the taper angle of the container is 2 to 5 ° (a) to
The above object was achieved by developing the vacuum packaging container according to any one of (e).

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The plastic material or aluminum foil composite material used in the vacuum packaging container of the present invention may be one normally used in vacuum packaging containers. As the plastic, a thermosetting resin or a hard thermoplastic resin such as polypropylene, polyethylene, polyoxymethylene, polyamide or polyester can be used. As the aluminum foil composite material, a laminate foil obtained by laminating a plastic film on an aluminum foil or a coating foil obtained by coating a resin on the aluminum foil can be used. The thickness of these aluminum foil and plastic film varies depending on the size of the vacuum packaging container to be molded.When the size of the container is large, the plastic material or aluminum foil, which is the raw material, can be used to resist deformation. The thickness of the plastic film to be laminated on the container is naturally large, and it is necessary that the container is not deformed even when vacuum-packaged.

In order to mold a container body from these materials, a coiled material is usually coated with a lubricating oil or the like, and cold molding, cold two-stage molding, warm molding or the like is used. Press molding is performed to mold the container body, and after stacking this, the flange portion is processed. Preferably, the flange may be processed during press molding. If this processing is performed at the same time, especially in the case of rib processing, the bead effect tends to suppress the generation of wrinkles. Generally, if the width of the flange of the vacuum packaging container is narrower than that when it is wide, the amount of deformation at the long side seems to be large when the opening is rectangular, probably because of the effect of springback of the raw material. is there.

The vacuum packaging container of the present invention is provided with a flange for heat sealing, high frequency sealing and ultrasonic sealing on the upper part of the container body. Even if the flange of this vacuum packaging container has the same thickness. , The container body is automatically packaged to prevent deformation as much as possible after vacuum packaging.
Alternatively, stacking is possible for convenient storage and transportation, and vacuum packaging is possible even if the flange width is not particularly large.
It is processed to prevent the flange from being deformed and the seal from failing when dropped. This flanging may be performed on the vacuum packaging container before filling the contents,
After filling, heat sealing, high frequency sealing, ultrasonic sealing, or the like may be performed, and flange processing may be performed at the same time, or after sealing, flange processing may be performed in a separate process before deformation of the flange occurs. Absent. The deformation of the vacuum packaging container causes bending deformation so that the long side of the flange is drawn into the container. In particular, large deformation is likely to occur in the central portion of the long side, and the amount of deformation decreases as it approaches the corner portion. In the present invention, in a vacuum packaging container made of plastic or aluminum foil having a flange, a rib is provided parallel to the flange on the entire circumference of the container or the flange on the long side of the container. At least one of the three treatment methods of bending the tip of the flange of the container and tilting the surface of the flange on the entire circumference or the long side of the container is adopted.

Since the container body is required to be formed of a material as thin as possible in order to reduce the cost, even if various strengthening measures are taken on the container body, the flange can only be completely deformed by vacuum. In some cases, some deformation cannot be avoided. In this case, the place with the highest possibility of deformation is the place with the weakest long side in the case of a rectangular or oval container, and this part is likely to be deformed. In the present invention, in this case, in order to prevent the deformation of the flange, the deformation is greatly reduced by using the above-mentioned three means or a combination thereof.

The present invention will be described below with reference to the drawings.
1 and 2 show an example of means for providing ribs on the flange of FIG. FIG. 1 is a top view of the container body 1 . The flange 2 is provided on the entire circumference of the container body, and the ribs 11 are provided on the entire circumference of the container or parallel to the long side of the container body. The container body 1 in a plastic vacuum packaging container or an aluminum foil composite material vacuum packaging container usually needs to be heat-sealed automatically in an automatic packaging line, and because of this, stacking is possible so that the container wall 3 is vertical. A surface having a taper angle of 2 to 5 ° with respect to the surface (slope)
, But a flange 2 is usually provided horizontally on the upper part thereof.

When the rib is provided in advance, the rib provided on this flange is provided in the shape of a groove in cross section as shown in FIG. When using a special heat-sealing device, it may be a ridge, but in a normal automatic packaging line, the ridge may be an obstacle when heat-sealing, so it is preferable to provide a groove. . The position where the concave groove is provided is not particularly limited, and although it depends on the size such as the width and depth of the container and the width of the flange, it is preferable that the groove width is 0.5 to 3 mm and the groove depth is substantially in the center of the flange. 0.1-
It is sufficient to provide ribs of about 3 mm. If ribs are provided too near the ends of the flange, it is better to avoid wrinkles around the ribs after sealing, which may cause leakage and may cause leakage. On the other hand, when flange processing is performed simultaneously with or after sealing, the rib does not need to be a groove, and may be a convex projection from the flange surface. It is also easy to provide a plurality of ribs instead of one. The vacuum packaging container used in such a case may be a conventional packaging container having a flat flange. If the groove width of the rib is less than 0.5 mm, the effect of preventing flange deformation is insufficient, and if the rib groove width is made wider than 3 mm, the flange becomes too wide considering the sealing width of the flange, which increases the cost. Cause. Also, when the groove depth is less than 0.1 mm, the flange deformation prevention effect does not appear, and the groove depth is 3 mm.
At deeper depths, there is a risk of excessive quality and further material cracking.

When the flange tip is bent and formed, as shown in FIG. 3, the bending width is 0.5 to 3 mm and the bending angle (θ ₁ ) is 0 to 50 °, so that the strength can be improved. If the bending width is less than 0.5 mm, it is not effective in preventing deformation of the flange, and if it is wider than 3 mm, excess quality is likely to occur. Considering the seal width, it is necessary to widen the flange width, which leads to cost increase. Become. When the bending angle is more than 50 °, there is no effect in preventing flange deformation, and if the angle is 0 ° or less, stacking becomes impossible and it cannot be used for packaging in an automatic packaging line. Also in this case, the flange processing may be performed simultaneously with the sealing or after the sealing.

When the flange surface is inclined, as shown in FIG. 4, the inclination angle (θ ₂ ) of the flange is usually when the width of the flange is approximately 5 to 12 mm, depending on the size of the vacuum packaging container. It is 10 to 60 °. If it is less than 10 °, there is no flange deformation preventing effect, and if it exceeds 60 °, the effect is saturated and the effect is not improved. If the angle is larger than this, a problem is likely to occur in heat sealing, so it is preferable to keep the angle to 60 ° or less. Usually, if the width of the flange is less than 5 mm, there is little effect on the strength of the container, and if it is wider than 12 mm, the effect is not particularly improved, so that the cost is increased and it is not economical. Also in this case, the flange processing may be performed simultaneously with the sealing or after the sealing. When such a flange is processed, when the container material is an aluminum foil composite material, the aluminum foil in the composite material is hardened by molding, so that it can further resist deformation compared to when it is a simple flat plate. Become. However, when flange processing is performed after sealing, care must be taken to perform processing at a level that does not cause seal defects.

Further, in the case of a vacuum packaging container which requires a vacuum seal, the taper angle of the container side wall is usually 6 to 10 °.
However, if it is desired to prevent the flange from being deformed, it is preferable to make it as small as possible, that is, the stacking limit of 2 to 5 °. By doing so, even when the content is solid, the gap with the side wall of the container can be narrowed, so that the stress applied to the flange when vacuum-sealed can be reduced. Therefore, if the taper angle of the container wall is reduced in addition to the above-described processing of the flange, it is possible to further suppress the deformation amount of the flange.

In this way, the flange of the container is provided in advance with the rib on the entire circumference of the container or on the long side flange of the container in parallel with the flange, and the tip of the flange of the entire circumference or long side of the container is bent, and Use a container that has been flanged by sloping the surface of the flange on the entire circumference or the long side of the container, or use a normal container with a smooth flange and perform similar flange processing at the same time as sealing, or use a similar container. By carrying out a similar flange processing after the usual sealing of the above, a vacuum packaging container having resistance to deformation can be manufactured. Unlike the conventional curl molding, such a vacuum packaging container does not require a complicated dedicated mold and can be sufficiently processed even when the flange width is narrow, so that there is an advantage that a large blank is not required. Yes, cost can be reduced. In terms of strength, curl molded products are stronger, but even with such simple means, they have sufficient strength for vacuum packaging, and as long as they do not require special strength, they are sufficient as commercial products. Has performance.

A device used for sealing, whether the flange is machined in advance, the flange is machined at the same time as the sealing, or the flange is machined after further sealing. For example, heat seal, high frequency seal, and ultrasonic seal can be adopted.
Particularly, in the case where flange processing is performed at the same time as sealing, it is preferable to use a high-frequency seal that can be sealed in a short time and can be left for cooling while the head is lowered when the current is cut off. Therefore, the high-frequency sealing method has characteristics that the molded shape is good because it is molded while being heated, and the shape can be maintained after cooling because it can be held by cooling.

[0019]

【Example】

(Example 1) As a material for a vacuum packaging container, a thickness of 300
An aluminum foil composite material composed of an unstretched polypropylene film (CPP) having a thickness of 120 μm, an aluminum foil having a thickness of 120 μm, and a CPP having a thickness of 30 μm, and a molding height of 44 m.
m, the length of the short side of the bottom is 44.7 mm, the length of the long side of the bottom is 67.7 mm, and the radius of the corner at the top of the container is 18 m.
After forming a rectangular container having m, a taper angle of 4.5 ° and a flange width of 10 mm by cold forming, a rib having a width of 2 mm and a depth of 1 mm was provided in the central portion of the flange over the entire circumference of the container. A 26 mm x 59 mm x 42 mmH acrylic resin model was used as the contents, and it was placed in the above vacuum packaging container and had a thickness of 25 µm biaxially stretched polyethylene terephthalate / 20 µm thick aluminum foil / 50 µm thick polypropylene resin sealant. The aluminum foil composite material consisting of was used as a lid material for vacuum packaging. Use a hand sealer for the vacuum seal, and the degree of vacuum in the chamber is -65.
The seal head descends when it reaches 0 mmHg,
Heat sealing was performed under the conditions of 190 ° C., 1 second and 1.5 kgf / cm ² . After being left at room temperature for 2 days, the degree of deformation of the flange of the container after vacuum sealing was visually judged. The results are shown in Table 1.

(Examples 2 to 4) Instead of providing the rib on the flange in Example 1, in Example 2, a container body in which the tip 3 mm of the long side of the container is bent at a bending angle (θ ₁ ) of 0 ° is used. did. Further, in Example 3, the container main body was used in which the flange on the long side of the container was bent to have a width of 10 mm and an inclination angle (θ ₂ ) of 45 °. Further, as Example 4, the taper angle of the container was set to 3.5 °, and 3
A container for vacuum packaging was molded in the same manner as in Example 1 using the container body having a width of 10 mm and an inclination angle (θ ₂ ) of 60 ° in the same manner. These containers were evaluated in the same manner as in Example 1. The results are shown in Table 1.

(Embodiment 6) Using a normal container having a smooth flange surface and a flange width of 10 mm, a high-frequency head which can be processed into the same shape (rib width 2 mm, rib depth 1 mm) as in Embodiment 1 was prepared. The vacuum in the chamber to -65.
When it reaches 0 mmHg, the seal head is processed,
It was sealed at 3 kW, 6 kgf / cm ² for 1.5 seconds, left for 1.5 seconds with the sealing head lowered, and then the container was taken out, and the same determination as in Example 1 was made. The results are shown in Table 1. (Comparative Example 1) For comparison, the container body of Example 1 in which the flange was not processed was used as a vacuum packaging container under the same conditions. Table 1 shows the determination results of this container.

[0022]

[Table 1]

[0023]

According to the present invention, in order to reduce the cost, the flange of the vacuum packaging container is deformed by reducing the thickness of the material, and the rib is provided on the flange.
The strength against the deformation of the flange can be greatly improved by using a container that is simply processed such as bending the tip of the flange or inclining the flange surface, or by performing a similar process at the same time as or after sealing a container with a smooth flange. As a result, it was difficult to avoid by thinning the material, resulting in deformation of the fragility due to the stress of vacuum packaging,
It significantly reduces the deformation of the flange due to the impact such as dropping, and also largely prevents the occurrence of troubles such as defective seal due to the deformation of the flange.

[Brief description of drawings]

FIG. 1 shows a vacuum packaging container of the present invention in which a long side flange is provided with ribs.

FIG. 2 is an enlarged cross-sectional view of a flange provided with ribs.

FIG. 3 is an enlarged cross-sectional view of a flange whose tip is bent.

FIG. 4 is an enlarged view of a flange in which the flange is inclined.

FIG. 5 is a front view of a vacuum packaging container in which a flange is provided with a rib.

FIG. 6 is a front view of a conventional vacuum packaging container in which a flange is deformed.

[Explanation of symbols]

1 Vacuum packaging container body 2 Flange 3 Container body side wall 11 Rib 12 Flanged flange tip A Rib width B Rib depth C Folded flange width D Tilted flange width θ ₁ Flange bending angle θ ₂ Flange tilt angle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideo Kawai, 6-224 Kaiyama-cho, Sakai-shi, Osaka Prefecture, Showa Aluminum Co., Ltd. (72) Inventor, Isamu Yamamoto 6-224, Kaiyama-cho, Sakai-shi, Osaka Prefecture Aluminum Showa Within the corporation

Claims (6)

[Claims] 1. A plastic vacuum packaging container having a flange or an aluminum foil composite material vacuum packaging container having a flange which is hermetically sealed by heat sealing, high frequency sealing, ultrasonic sealing, or the like. Provide a rib on the flange of the long side of the container, bend the entire circumference of the container or the tip of the flange of the long side of the container, and incline the flange surface of the entire circumference of the container or the long side of the container. A vacuum packaging container characterized by having been performed. 2. A plastic vacuum packaging container having a flange or an aluminum foil composite material vacuum packaging container having a flange which is hermetically sealed by heat sealing, high frequency sealing, ultrasonic sealing or the like, and is parallel to the flange at the same time as or after sealing. The entire circumference of the container or the long side flange of the container with one or more ribs, the entire circumference of the container or the long side flange of the container is bent, and the entire circumference of the container or the long side of the container A container for vacuum packaging, characterized in that any one of inclining the flange surface of the. 3. The width of the rib provided on the flange is 0.5 to 3
mm, height or depth is 0.1 to 3 mm.
Or the vacuum packaging container according to 2. 4. The flange has a tip with a width of 0.5 to 3 mm,
The vacuum packaging container according to claim 1 or 2, wherein the bending angle (θ ₁ ) is 0 to 50 °. 5. The inclination angle (θ ₂ ) of the surface of the flange is 10
The vacuum packaging container according to claim 1 or 2, which is inclined at -60 °. 6. The vacuum packaging container according to claim 1, wherein the taper angle of the container is 2 to 5 °.