JPS61203353A - Pack for liquid and viscous body - 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 relates to packs for containing seasoning liquids such as soy sauce and sauces used for boxed lunches and school lunches, and packs for other liquids and viscous substances.

Conventional packs use soft packaging materials, and while they are low cost, they have many drawbacks, such as the contents spilling out when opened, staining hands and clothes, and the direction of the discharge being unstable. The reason for this is that the pack packaging material itself is soft.
This is because the pack is crushed during the opening operation, and the pack is opened with pressure still applied inside.

In order to solve this drawback, at least the vicinity of the opening part should be made of a hard material, but in order to achieve such a structure, it is necessary to join the opening part of a hard material to a pack made of a soft material, or to use a thick material. There are problems in terms of cost, such as the need to form and process using soft materials. Another method is to construct the entire pack from hard PVC, but ordinary heat sealing is not suitable for this type of material and requires the use of expensive equipment such as high-frequency bonding or ultrasonic bonding.
This is not preferable from the point of view of equipment cost.

Conventionally, this type of pack has been mainly a small bottle with a lid made of polyethylene or the like. These bowls were shaped like prototypes, fish, or small bottles, and were often made of polyethylene, etc., and although they were flexible, the parts were thick and had a certain degree of restorability as a whole. In addition, since it has a plastic lid, users perceive it as a smaller version of the ``bottle'' that they are accustomed to using on a daily basis, and it is easy to use, giving a sense of security and familiarity, and is still used today. There is. However, this type of shaped container has problems such as high material and manufacturing costs, difficulty in filling the seasoning liquid, poor gas barrier properties, and easy deterioration of the seasoning liquid. It became something that could not be matched. Therefore, sachet packs were created using soft packaging materials, but the original sachet packs had a thick opening (
Because it opens, the seasoning liquid inside often comes out all at once when using it (which was quite inconvenient, such as when I had to pour the appropriate amount of seasoning liquid on several Hayabusa vegetables). Also, the moment the package was opened, the seasoning liquid would often scatter and stain clothes, tables, etc. Therefore, an attempt was made to improve the opening by making the opening smaller to limit the amount of liquid dispensed. These include opening only the corner of the pack to make the opening smaller, or creating a narrow passage in the sealed part so that the seasoning liquid can be discharged little by little from this passage. On the contrary, these may cause the seasoning liquid to come out and leave the seasoning liquid inside, or the opening may have an irregular shape due to the soft packaging material, which may impair the direction of discharge. The result was that the seasoning liquid was blown away in unexpected directions.Especially, in order to release the remaining seasoning liquid, I had to fold the entire sachet pack thinly and squeeze it with the pad of my finger, so I had to be careful with my hands. It is difficult to squeeze out the product without making a mess.Furthermore, these pouch packs made of soft packaging materials are more like bags than containers, and cannot solve the instability and uncertainty of handling.

The disadvantages of these soft packs are often overlooked on a daily basis, but they are a serious problem for caterers, as these packs can cause customers to stain their expensive clothing.
There is also the fact that the business that was using the pack was forced to pay a considerable amount of money. In order to avoid such risks, many banquet-related businesses currently use small shaped bottles with lids, which are more reliable.

The feature of the pack of this invention is that the pipe is basically constructed using a laminated film with a certain rigidity, and both ends of this pipe are sealed. When taking out the contents, one end of the seal is opened. With the opening facing downward, the body of the pack is pumped to push or loosen it. This pack is extremely simple in shape, and although it is a structure that anyone would have thought of upon seeing it, it is something that conventional technical considerations had not considered at all.

The main reason for this is that while the main focus of conventional pack development has been on pouch packs made of soft packaging materials, everything from material development to manufacturing technology has become centered around formed small bottles and pouch packs. I think this is because the physical properties of these conventional packs are different from each other, and it is no longer possible to develop them. To give a specific example, a rigid packaging film is required to construct the pack of the present invention, but although packaging material manufacturers produce various kinds of flexible packaging materials, there is a food grade film suitable for heat sealing. The company does not manufacture rigid films, and if it were to be implemented using existing packaging materials, it would have to rely on forming processing using food-grade rigid sheets.

Since this kind of forming process was not a big deal from a cost standpoint, we had no choice but to start with the development of the ideal packaging material. During the development of this packaging material, it became clear that the polyethylene layer conventionally used for the heat-sealing surface had a weak sealing strength and was not suitable for rigid structures like the pack of this invention. Ta. Conventional LDPE (low density polyethylene) is about 40 microns and has a seal strength of about 3/15 mils at 130°C, but bag tearing tests have shown that this is insufficient.

This polyethylene has conventionally been used for the sealing part of sachet packs, but it is thought that the shape of the sachet pack could not be changed due to the weak seal strength. In order to overcome this problem, current sachet packs have a small amount of contents to leave enough space inside. This is to allow the packaging materials on the front and back sides of the pouch to come into contact even if pressure is applied to break the bag, and to prevent direct pressure from being applied to the pack packaging material and the sealed portion. By using them in this way, sachet packs became somewhat practical and became popular as they are today, but as a result, the industry imposed the difficulty of using sachet packs on consumers. They sat cross-legged on cost considerations and did not make any further improvements or developments. If it can be praised, the unique shape of the sachet pack compensates for this weak sealing strength, and as long as the sachet pack continues in that shape, it is difficult for packaging material manufacturers to proceed with further development, creating a vicious cycle. You can say that. In this vicious cycle, the industry has reached a point where the only options available for packs are sachet packs or small shaped bottles with lids. However, on the other hand, considerable progress has been made in the field of packaging films. As mentioned earlier, one of the bottlenecks in developing the pack of this invention was the sealing strength of the film, but in this regard, polyethylene, which has about twice the sealing strength of conventional ones, has come to be commonly used. So I used that to solve the problem. This polyethylene film significantly increases the tear strength of soft packaging material packs, and is already used in some sachet packs for seasoning liquids. By effectively using such materials, it should be possible to improve the shape of sachet packs and make them easier to use, but the industry is complacent with the status quo despite having such materials on hand on a daily basis, and is not reconsidering the packs. The reality is that even the lamination of seed polyethylene and hard film is not done. Against this background, this invention has the meaning of "valley product",
Its shape had to be similar to that of a ``Columbus egg.''

The purpose of this invention is to obtain a pack for liquids and viscous substances such as seasoning liquids that does not have the drawbacks of conventional packs as described above, and the above problems are solved as follows. .

First of all, the poor gas barrier properties and poor cost performance inherent to small bottles with lids were solved by using a laminate film with good gas barrier properties. Second, the inherent disadvantages of sachet packs, such as scattering of contents and staining of hands when opened, were solved by giving the laminated film a certain degree of rigidity. Thirdly, if you make the opening of the sachet pack larger, the contents will come out all at once, or conversely, if you make the opening smaller, it will be difficult for the contents to come out. Taking advantage of its rigidity, we pumped the pack to release its contents by gently crushing it. Fourthly, in order to improve material cost efficiency, the film was made as thin as possible without impairing the necessary physical properties. This simultaneously improved productivity and resulted in lower production costs. Fifth, we investigated a shape that would provide the necessary rigidity using a thin film, and found a ``stick pack.''
The problem was solved by changing the shape. With this shape, the smaller the diameter, the thinner the film can provide the necessary rigidity, but from a practical standpoint, research and testing revealed that the diameter is around 1α, that is, the circumference of the cross section, in order to open it with your fingertips or attach it to a lunch box. It was determined that something around 3C11 was appropriate. It has also been found that when a pack having a diameter of this order is constructed using a film having a laminate structure, which will be described later, the thickness of the laminate film can be practically used from about 100 μm. At the same time, if the thickness is around this level, the manufacturing method is not much different from that of soft packaging materials, and the manufacturing cost is also 40% lower. Sixth, when we examined the problem of seal strength, we conducted an experiment and found that by laminating TtJX (trade name) type polyethine film of "Tokyo Cellophane Paper■", we found that the seal strength was more than twice that of the LDPE class. obtained and proved to be fully practical.

The present invention has been outlined above, and will now be described with reference to drawings showing embodiments.

FIG. 1 is a side view of the pack, in which the substantially inner and outer surfaces of the opposing edges of a flexible and heat-adhesive approximately rectangular packaging material are sealed at the back adhesive part 2; Each opening is sealed to form a stick pack. At this time, an opening cut 12 is provided so that the internal volume space can be pinched near at least one of the seal sections 1 and a part of this pinch section 11 can be opened.

To remove the contents from this pack, the opening cut 12 is torn to open the end of the clip portion 11, and the pack is pumped so as to lightly crush the pack with the opening facing downward.

At this time, if you stop pumping when the appropriate amount has been dispensed, a portion of the contents can be left in the pack.

The reason why this pack does not spit out the contents when opened is that firstly, the packaging material has a certain degree of rigidity, and secondly, the cross section of the pack is relatively cylindrical and has a highly rigid structure. This is because the pack itself deforms little when opened, and therefore no pressure is applied to the inside of the pack that would cause it to eject.

Further, by providing the pinch portion 11 and enlarging the seal portion 1, the seal portion 1 becomes easier to grab when opening the package, and deformation of the pack itself is prevented. Furthermore, in order to ensure this ejection prevention effect, the filling amount of the contents may be adjusted to be smaller so that a space is created in the vicinity of the clip portion 11.

The opening cut 12 is provided so as to cover a part of the sandwich portion 11, but in this way, the opening cut 1
There is an advantage that the size of the opening can be adjusted by adjusting the position of 2. When the opening cut 12 is placed closer to the center of the pack, the opening becomes larger, and when it is placed closer to the ends, it becomes smaller, and the size of the opening is determined by the viscosity of the contents and the amount of discharge.

Fig. 2 is a circumferential cross-sectional view of the pack shown in Fig. 1. Conventionally, a pack in which the back and front surfaces of a hard packaging material are attached to the back in an envelope shape so that the cross section forms an almost circular shape is shown in Fig. 2. Not manufactured. The main reason for this is that hard vinyl chloride, which is the most commonly used hard material, has poor bonding properties, and when bonded together in a cylindrical shape, the bonded surfaces are susceptible to deformation and peeling of the bonded surfaces. Ta. In addition, in order to solve this problem, there are attempts to improve thermal adhesion by laminating hard vinyl chloride and polyethylene, etc., but when using heat sealing, hot peeling that occurs when separating the heat plate is difficult. Significantly good sealing performance cannot be obtained.

In this invention, the above problem was solved by laminating the packaging materials of the pack in the following manner. The drawing showing the laminated state in FIG. 3 shows one of the embodiments, and the polyethylene layer 3 and the nylon layer 4 are layered from the substantially inner side.
, a hard vinyl chloride layer 5, a nylon layer 6, and a polyethylene layer 7. Polyethylene layer 3 has a thermal softening point of 9
cm, and the polyethylene layer 7 has a thermal softening point of about 120°C.

The hard vinyl chloride layer is preferably one for food use.

The reason why this packaging material does not cause peeling of the joint surface when the hot plate is removed is as follows. In Figure 2, when polyethylene layers 3 and 7 are fused together and the hot plate is separated, the temperature of both polyethylene layers 3 and 7 decreases, but polyethylene layer 7, which has a higher thermal softening point, hardens first. Subsequently, the polyethylene layer 3 begins to harden. At this time, the previously cured polyethylene layer 7 is mixed into the uncured polyethylene layer 3 to prevent separation until both are completely cured. Here, the thermal softening points of both materials were set at approximately 90° C. and approximately 120° C., because materials with these physical properties are the most readily available at this stage, and the materials meet those standards. The thermal softening point of each material is appropriately designed in consideration of various conditions such as the thickness of the material, the speed of the production line, and the temperature of the hot plate. The nylon layer 4.6 is provided to improve the lamination properties between the winning vinyl chloride layer 5 and the polyethylene layer 3.7, and to improve gas barrier properties. Further, it is preferable that printing such as content display is provided on this nylon layer.

Next, one embodiment will be explained with reference to FIG. 4.

This pack differs from the pack described in FIG. 2 in the back attachment. Figure 4 shows a cross section of this pack.As shown in the figure, the substantially inner surfaces of the films are joined to each other at the spine attachment part 2, and this spine attachment part is folded down to follow the pack. Construct it into a shape.

When configured in this manner, the inner surfaces of the films are bonded together, and it is essential that at least only the inner surfaces have thermal adhesiveness. If this condition is to be met with a laminate film, it is only necessary to laminate a heat-adhesive material only on the actual inner surface, and compared to the type shown in Figure 2, the laminate structure can be omitted. .

FIG. 5 shows an example of one of the laminated structures of the laminate film of the pack shown in FIG. If(+) is laminated.

Another embodiment will be explained with reference to FIG.

FIG. 6 is a cross-sectional view of the pack, and the film is constructed so that the substantially inner surfaces of the film are joined together and attached to the back, and this back attachment part 2 is left standing upright. This type of pack, like the one shown in Figure 4 and l1iJ, only needs to have heat-adhesive properties in the film, and can be composed of at least a laminated film as shown in Figure 5. .

The embodiments have been described above, and next, the laminated structure of the film will be described.

This film is required to have a certain degree of rigidity and thermal adhesiveness, as well as safety and gas barrier properties for food use. In that sense, a single-layer film may be used, but at present it is best to use appropriate materials, and in terms of material procurement, ease of processing, and cost, it is judged that it is most preferable to obtain the desired effect by laminating the film. FIG. 3 of the embodiment diagrams shows the laminated structure of the film, and when the cross-sectional diameter of the pack is 1 to 1.3 cm, the hard vinyl chloride layer 5
It is judged that the desired effect can be obtained if the thickness of the polyethylene layer 3.7 is around 25 to 30μ, and the nylon layer is around 15μ. Furthermore, in the case of the laminated structure shown in FIG. 5, the nylon layer and the polyethylene layer are omitted one by one compared to the structure shown in FIG. ~30μ and the nylon layer 9 has a thickness of about 15μ, the desired effect can be obtained. This pack attempts to maintain the rigidity of the entire pack by processing the film into a cylindrical shape.In that sense, if the diameter of the pack is small, a film with low rigidity can be used, and when increasing the diameter, the rigidity of the pack must be increased. Use high film. The dimensions of each layer of the above laminated film are a standard obtained as a result of experiments, but when laminated like this, the rigid vinyl chloride layer is mainly responsible for the rigidity of the film, and the diameter of the pack is When changing, the thickness of this hard vinyl chloride layer is adjusted to obtain the required rigidity of the pack itself.

Next, the cross-sectional shape of this pack will be explained.

This pack can be made into any shape, such as a circular cross section, an oval as shown in Figure 7, a teardrop shape as shown in Figure 8, a triangle as shown in Figure 9, or a polygon. As long as the pack is constructed as follows, almost the same rigidity can be obtained as a whole pack. These cross-sectional shapes are related to the manufacturing method. The simplest method is to create a teardrop shape, which can be achieved by bending the film and sealing it into a cylindrical shape. If a mold is placed inside and guided by this mold, accurate circles, ovals, triangles, etc. can be formed.

Also, when sealing the seal part 1 after filling the contents,
By covering the outside of the pack with a mold and sealing it, each shape can be maintained.

Next, the position where the back sticking part 2 of this pack is provided will be explained. The back sticking part 2 may be provided in the center as shown in FIG. 1, or may be provided on the sides.

This laminated film is composed of a rigid core material layer such as a hard vinyl chloride layer and an outer layer with excellent thermal adhesiveness such as a polyethylene layer. Use materials that are resilient, heat resistant, laminated, and food safe. In addition to polyethylene, the outer layer is made of at least heat-fusible,
Use materials with barrier properties and food safety, such as soft and hard vinyl chloride, propylene, etc. However, for food use, it is desirable to use a transparent material. We investigated the lamination of these various materials, and at this stage it was found that a combination of hard vinyl chloride and polyethylene is the cheapest and can provide sufficient sealing strength and the required physical properties.

This invention was developed with the aim of using heat sealing to bond films, but this also includes direct heating methods such as impulse sealing.

Furthermore, if equipment such as ultrasonic bonding or high-frequency bonding can be used, packs having the shapes described herein can be made using materials suitable for each method.

The pack according to the present invention obtains a rigid structure by laminating films of about 100 to 130 microns in a relatively cylindrical shape, and can be manufactured by the relatively widely used heat sealing method. It can be manufactured at a lower cost compared to the forming method, is easier to hold than soft packaging materials, and when used for seasoning liquids, it does not scatter or stain hands when opened, making it safe for children and the elderly to use. You can get it. Further, this pack can be suitably designed to take advantage of the above advantages and can be widely used for other liquids and viscous materials.

[Brief explanation of the drawing]

The drawings show an embodiment of the pack of the invention. Fig. 1 is a side view of the pack, Fig. 2 is a circumferential sectional view of the pack, Fig. 3 is a sectional view showing the laminated state of pack packaging materials, Fig. 4 is a circumferential sectional view of the pack, and Fig. 5 is a sectional view of the pack in the circumferential direction. The figures are cross-sectional views showing the laminated state of pack packaging materials, Figures 6, 7, 8, and 9.
The figure shows a sectional view of the pack in the circumferential direction. DESCRIPTION OF SYMBOLS 1... Seal part, 2... Back sticking part, 3... Polyethylene layer, 4... Nylon layer, 5... Hard vinyl chloride layer, 6... Nylon layer, 7... Polyethylene layer, 8... polyethylene layer, 9... nylon layer, 1o
...Hard vinyl chloride layer, 11...Pinch portion, 12.
...Opening cut.

Claims (1)

[Claims] 1. A packaging film having rigidity and flexibility and at least a sealing surface having heat-sealing properties is used, and this film is sealed at the backing part 2 to form a cylinder, and the cylinder is The cross-sectional shape in the circumferential direction of the cylinder is made to have an arbitrary shape, and both ends of the cylinder are sealed so as to be crushed to form seal parts 1.1, and any of the seal parts 1. A seasoning liquid pack characterized in that one side of the pack is opened and the contents are discharged by deforming the pipe and increasing the internal pressure. 2. The pack according to claim 1, wherein the tube is formed by sealing the edges of the substantial front side of the film and the edges of the front side. 3. The pack according to claim 1, characterized in that the edges of the substantial back side of the film are sealed together, and the spine part 2 is folded down so as to follow the packaging surface of the pack. . 4. The pack according to claim 1, characterized in that the edges of substantially the back side of the film are sealed to each other so that the spine sticking part 2 stands upright. 5. The pack according to claim 1, wherein the cylinder has a substantially circular cross-sectional shape in the circumferential direction. 6. The pack according to claim 1, wherein the cylinder has a substantially elliptical cross-sectional shape in the circumferential direction. 7. The pack according to claim 1, wherein the cylinder has a substantially triangular cross-sectional shape in the circumferential direction. 8. The pack according to claim 1, wherein the circumferential cross-sectional shape of the cylinder is approximately teardrop-shaped. 9. The packaging material is laminated in five layers, and consists of a polyethylene layer 3, a nylon layer 4, a hard vinyl chloride layer 5, a nylon layer 6, and a polyethylene layer 7 from the substantial inside. A pack according to claim 1. 10 The packaging material is laminated to consist of five layers, and consists of polyethylene layer 3, nylon 4, hard vinyl chloride layer 5, nylon layer 6, and polyethylene layer 7 from the substantial inside, and at least the hard vinyl chloride layer 5. The pack according to claim 1, wherein the pack has a thickness of about 50 microns. 11. Claim 1, characterized in that the packaging material is laminated in three layers, with the polyethylene layer 8, the nylon layer 9, and the hard vinyl chloride layer 10 starting from the substantial inside. Pack of. 12 The packaging material is laminated to consist of three layers, and from the substantial inside, the polyethylene layer 8, the nylon layer 9, and the hard vinyl chloride layer 10, and the hard vinyl chloride layer 10
The pack according to claim 1, characterized in that the diameter of the pack is approximately 60 microns. 13. The pack according to claim 1, characterized in that when sealing the seal portion 1, the seal is diagonally sealed as shown in FIG. 1 to form a narrowing portion 11 in the internal volume space of the pack. . 14. The pack according to claim 1, characterized in that the circumferential length of the cross section of the pack is approximately 3 cm.