JPS6357316B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a package for extrusion of contents, and more specifically to a flexible plastic hollow extrusion container such as a tube and a package for filling the container. The present invention relates to an extrusion package comprising a viscous content having excellent extrusion properties and an air bag prevention effect. (Prior art and its problems) It has been pointed out that conventional extruded tubes made of plastic still have problems in terms of extrusion characteristics and the occurrence of air bags. First of all, with this kind of tube, after pressing the tube to extrude the contents, when this pressing force is released, the tube tends to return to its original shape due to the tube's own elastic recovery force. There is a tendency to draw not only the contents but also the outside air into the cylindrical body. This suction of outside air occurs before resealing by the cap, so
When the contents inside the tube come into contact with outside air, problems such as deterioration, discoloration, loss of flavor, and loss of aroma occur due to oxygen and airborne microorganisms. In addition, when reusing the package, if the air inside the tube is not exhausted, the contents may not be extruded as desired, or the contents may be violently expelled and scattered at the same time when the internal air is expelled. This can easily cause problems. (Means for Solving the Problems) In order to solve the above problems, the present invention provides an extrusion package consisting of a flexible plastic hollow container and a viscous content filled in the container.
The hollow container is separated from a flexible cylindrical body, a narrowed orifice passage connected to the body through a shoulder, and a retention part connected to the orifice passage via a step and having an extrusion port at the tip. Further, the viscosity of the viscous content is in the range of 1,000 to 250,000 centipoise, the viscosity of the content is η (centipoise), the cross-sectional area of the orifice passage is S ₀ (square millimeter), and the cross-sectional area of the retention part. S ₁ (square millimeter), the axial dimension of the retention part l (mm),
The compression recovery force in the unfilled state of the cylindrical body is E (grams).
Then, the following formula logη≧−logl−logS ₁ /S ₀ +5.45…(1) logη≧0.588logηS ₀ +0.764logE+2.30…(2) S ₁ /S ₀ ≧2…(3) is satisfied. The container dimensions and content viscosity are set within such a range that (Function) First, an example of the package of the present invention is shown in FIGS. 1 and 2. This package consists of a tube container 1, a lid 2, and contents 3 filled in the container. The tube container 1 consists of a flexible cylindrical body 4, a shoulder 5 connected thereto, and an extrusion port 6, and the other end of the cylindrical body 4 forms a bottom seam 7. In the present invention, as shown in the enlarged views of FIGS. 3 and 4, the shoulder 5 and the extrusion port 6 are connected to each other via a narrowed orifice passage 8 and a stepped part 9 of the orifice passage. A retention section 10 having an extrusion port 6 is provided. In this specific example, each part of the tube container 1 is integrally formed by blow molding (hollow molding) a thermoplastic resin parison, and the orifice passage 8 is formed by meshing the diameter of the parison with a mold to narrow it. It is formed by In this specific example, as shown in FIG.
The cross section of is square, and the cross section of retention part 10 is circular, but it goes without saying that these cross-sectional shapes may be arbitrary. In the present invention, the content 3 filled in this tube container is 1000 to
It has a viscosity of 250,000 centipoise, especially 5,000 to 150,000 centipoise. In the present invention, the viscosity of the content 3 is η (centipoise), the cross-sectional area of the orifice passage 8 is S ₀ (square millimeter), the cross-sectional area of the retention section 10 is S ₁ (square millimeter), and the axial direction of the retention section 10 is When the dimensions are l (millimeters) and the compressive recovery force of the cylindrical body 4 in the unfilled state is E (grams), the following formula logη≧−logl−logS ₁ /S ₀ +5.45…(1) logη ≧0.588logS ₀ +0.764logE+2.30...(2) S ₁ /S ₀ ≧2...(3) The container dimensions and content viscosity are determined within a range that satisfies the following. The significance of these inequalities will be explained below. Now, if we press the cylindrical body 4 of the tube container package filled with contents to push out the viscous contents from the mouth part 6, and then observe the state in which the pressing force of the cylindrical body 4 is released, we can see that As shown in Figure 5-A and Figure 5-B. That is, in Fig. 5-A, when the cylindrical body 4 is pressed and the contents are taken out, it is at a position _F0 overlapping the surface of the tip opening 6 of the contents, but when this pressing force is released, , due to the elastic restoring force of the cylindrical body 4,
The viscous contents 3 in the retention part 10 are sucked into the cylindrical body, and its tip surface becomes a parabolic rotating surface F1 with a concave center, as shown in Figure 5-A, and the viscous contents ₃ are drawn into the cylindrical body. As the suction of the object 3 progresses, as shown in Figure 5-B, the contents in the center are strongly suctioned.
Finally, an air passage 11 is formed in the center. With this air passage 11 formed,
As already described in detail, air is sucked into the tube container, and the contents come into contact with the air over a wide contact area, causing various types of deterioration. Therefore, in order to solve the above-mentioned problems, it is generally necessary to hold the contents for about 20 seconds after extruding the contents from the tube container and before opening and resealing the cap 2. It is important that the tip of the viscous material in the section 10 is located closer to the extrusion port than the limit position _F2 shown in FIG. 5-C. In Figure 5-C, the flow rate V ₀ of the viscous material sucked through the orifice passage 8 within the above time is:
Since it is proportional to the cross-sectional area S ₀ of the passage 8 and inversely proportional to the viscosity η of the contents, V ₀ =K ₁ S ₀ /η (4-1), and the viscous material tip surface F ₂ is a conical surface. Therefore, if the height of the conical surface is h and the bottom surface (which is the same as the cross-sectional area of the retention part) is S ₁ , then V ₀ =k ₂ S ₁ h (4-2). At this limit position, l-h=0, so from this, l-h=l-k ₃ S ₀ /S ₁・η=0...(4-3), and taking the logarithm of this, logη= −logl−logS ₁ /S ₀ +logk ₃ …(1a). Here, k ₁ , k ₂ and k ₃ are all constants. When the value of logk ₃ is calculated from the experimental results, a value of logk ₃ =5.45 is obtained. Figures 6-A and 6-B are plots of the above straight line 1a and the experimental results, with the viscosity η of the contents taken on the vertical axis and the axial distance l of the retention section 10 taken on the horizontal axis. - Diagram A is the 6th when S ₁ /S ₀ is 16.
Figure 5-B shows the case where S ₁ /S ₀ is 4, and the plot circles (〇) of the experimental results indicate the state of the viscous substance in the container as shown in Figure 5-A, 30 seconds after the contents are removed. For items that were hot, the cross mark (×) indicates the removal of the contents 30
The state of the viscous substance in the container after a few seconds is shown in Figure 5-B. According to the results shown in Figures 6-A and 6-B, it is clear that the above formula 1a has extremely critical significance in preventing airbags, and the container dimensions and contents should be adjusted so as to satisfy the above formula (1). By determining the viscosity of the material, it is possible to prevent airbags. That is, for contents with a constant viscosity, it is effective to prevent air bags by increasing the axial distance l of the retention section 10 and increasing the ratio of the retention section cross-sectional area S ₁ /orifice cross-sectional area S ₀ . In addition, it can be seen that for tube containers with constant dimensions, increasing the viscosity of the contents is effective in preventing airbags. Next, in the present invention, the viscosity η of the contents, the cross-sectional area S ₀ of the orifice passage, and the compression recovery force E
It is also important to choose Figures 7-A, 7-B, and 7-C plot the experimental results with the vertical axis representing the viscosity η of the contents and the horizontal axis representing the cross-sectional area _S0 of the orifice passageway 8.
Figure 7-A shows when the compression recovery force E of the torso is 100g,
Figure 7-B shows that when this recovery force E is 200g,
-Figure C shows the case where the recovery force E is 50g.
In addition, the blot circles (〇) in the experimental results indicate that the state of the viscous substance in the container was as shown in Figure 5-A 20 seconds after the content was removed, and the cross mark (x) indicates that the state of the viscous substance in the container was as shown in Figure 5-A. The state of the viscous material after a few seconds is shown in FIG. 5-B. From these results in Figures 7-A, 7-B, and 7-C, the above formula (2) also has critical significance in preventing airbags, and the following formula logη=0.588logS ₀ +0.764logE+2.30 It is clear that the airbag phenomenon is effectively prevented in the region above (2a). That is, for contents with a constant viscosity, the cross-sectional area of the orifice passage 8
It can be seen that reducing S ₀ or reducing the compression recovery force of the trunk 4 is effective in preventing airbags. In the present invention, when the pressing force of the tube container body 4 is released and the viscous substance in the retention part 10 is sucked into the container, the tip surface thereof is shown in FIG. 5-A as a parabolic rotation surface. In order to cause the volume to decrease to the state shown by the conical surface F ₁ , the retention part 10 must be
It is also important to have a relatively large cross-sectional area S ₁ and a relatively small cross-sectional area S ₀ for the orifice passageway 8, and to form a step between them. If the content is bent, the entire tip surface of the contents will be lowered, resulting in volume reduction, and the air bag prevention effect will no longer be expected. In the present invention, by setting the cross-sectional area ratio S ₁ /S ₀ to 2 or more, particularly 3 or more, a satisfactory air bag prevention effect can be achieved. On the other hand, if this cross-sectional area ratio S ₁ /S ₀ becomes too large, the extrusion characteristics (squeezing characteristics) will deteriorate and the shape of the container will also deteriorate, so the value of S ₁ /S ₀ should be 20 or less, especially 10 or less. It is desirable to do so. From the above explanation, in the present invention, contents 3
Even when the viscosity η of the tube container is relatively low and the compressive recovery force E of the tube container is relatively large, the orifice passage 8 and the retention section 10 are provided, and S ₀ , S ₁ /
It is clear that airbags can be prevented by determining the values of S ₀ and l to satisfy the above equations (1), (2), and (3). (Preferred Embodiment of the Invention) In the present invention, the flexible plastic hollow container may take any form such as a tube-shaped container or a blow-molded bottle. It is intended to be extruded and used by pressure. In the present invention, the tube container 1, which is an example of a hollow container used, can be made of any material, such as plastic, metal foil, a laminate thereof, or a laminate of these and paper. I can do it. As a plastic, it can be low, medium or high.
Density polyethylene, isotactic polypropylene, crystalline ethylene-propylene copolymer,
Olefin resins such as ethylene-vinyl acetate copolymer and ionic crosslinked olefin copolymer; Nylon resins such as nylon 6, nylon 6,6, and nylon 12; Polyesters such as polyethylene terephthalate and polybutylene terephthalate; Vinyl chloride stem fat; chloride Vinylidene resin; examples include styrene/butadiene copolymer, styrene/butadiene/acrylonitrile copolymer, and ethylene-vinyl alcohol copolymer. Examples of the metal foil include aluminum foil, tin foil, iron foil, steel foil, and the like. In the present invention, gas barrier properties are great, but
Extrusion with excellent air bag prevention properties using plastic materials that have a relatively large compression recovery force and were previously unsuitable for this type of extrusion container, such as vinyl chloride resin, vinylidene chloride resin, high nitrile resin, polyester, and polyamide. Containers can be manufactured. Of course, resins with poor gas barrier properties, such as olefin resins, can also be used for the purpose of the present invention in the form of being coated with a gas barrier resin such as vinylidene chloride resin, or in the form of being laminated with a gas barrier resin or metal foil. . FIG. 8 shows the laminate 1 constituting the tube container 1.
2 shows the cross-sectional structure of the laminate 12.
has a gas barrier layer 13 and inner and outer surface layers 14 and 15 made of olefin resin, both of which are laminated and bonded via adhesive layers 16a and 16b. The gas barrier layer 13 may be a metal foil such as aluminum foil or a gas barrier resin such as vinylidene chloride resin. In the present invention, if the container 1 is made entirely of plastic material, all parts of the container can be manufactured by blow molding a parison, as shown in FIGS. 1 and 2. Of course, as shown in FIG. 9, the inner cylindrical body 4 of the container 1 is formed by rolling the above-mentioned laminate sheet into a cylindrical shape and heat sealing the opposing edges to form a straight seam 17. Shoulder part 5,
The orifice passage 8 and the retention section 10 are integrally formed by plastic injection molding, and the circumferential seam 18 is formed by welding one open end of the cylindrical body and the shoulder section by means such as ultrasonic welding. It may be formed. In addition to the shape shown in FIG. 4, the orifice passage 8 has a circular shape shown in FIG.
- It can take any shape, such as the star shape shown in Figure B. Furthermore, as shown in FIG. 10-C, an inner stopper 19 can be fitted into the tube container mouth 6, and a cross-shaped orifice passage 8 can be provided at the bottom of the inner stopper. In this case, a large number of protrusions 20 cut in a cross shape open in the extrusion direction when extruding the contents, and the advantage of improving the extrusion performance of the contents is also achieved. (Effects of the Invention) Thus, according to the present invention, there is provided a package for extrusion of contents, which has a simple container shape and structure, yet has smooth extrusion characteristics and an excellent air bag prevention effect. (Example) Example 1 and Comparative Example 1 The cross-sectional area S ₁ of the mouth retention part is 16 mm ² , the length l is 12 mm,
Flexible laminated round shape with a barrier (oxygen) layer mainly made of LDPE with a cross-sectional area S ₀ of the orifice part of 4 mm ²
A 500C.C. container filled with tomato paste was extruded repeatedly. During that time, the container did not return and the tomato paste could be extruded smoothly until it ran out. When this container was pressed, the maximum return force E was 87 g, and the viscosity η of the tomato paste during use was 35,000 cp when measured with a B-type rotational viscometer. For comparison, tomato paste was placed in a relatively hard laminated round 500 C.C. container containing a barrier layer (oxygen) mainly made of PP with the same mouth and orifice dimensions as in Example 1 and extruded. used. When I extruded and stopped the extrusion, the container returned to its original shape.When I tried extruding again, when the container returned to its original state, the tomato paste came out along with the air that had gotten in, making it impossible to extrude smoothly.
Also, when the tomato paste was extruded after several days of use, the surface of the tomato paste was oxidized and discolored due to air being trapped. The maximum return force E of the container used for this when extruded was 350 g, and the viscosity (η) of the tomato paste was 32,000 cp. Examples 2 to 7, Comparative Examples 2 to 5 Tests similar to those in Example 1 were conducted with various container dimensions and container contents. These test results are shown in Table 1 together with the results of Example 1. In addition, to judge whether the result is good or not, after extruding the contents,
If the container did not return for 30 seconds or more, a defective judgment indicates that the container returned within 30 seconds after extruding the contents and sucked in the contents and air. From the results of these Examples, it is understood that in order to obtain good extrusion characteristics and air bag prevention effects, it is necessary to satisfy the requirements of general formulas (1) to (3). 【table】

[Brief explanation of the drawing]

FIG. 1 is a plan view of an example of the packaging body of the present invention, and FIG.
Figure 3 is an enlarged sectional view of the main part of the container shown in Figure 1, Figure 4 is an enlarged sectional view taken along the line - in Figure 1, and Figure 5-A is an enlarged sectional view of the package shown in Figure 1. Explanatory diagram showing an example of a state in which the viscous contents are bent, No. 5-
Figure B is an explanatory diagram showing another example of the state in which the viscous contents are bent, Figure 5-C is an explanatory diagram showing the dimensions of each part, and Figures 6-A and 6-B are explanatory diagrams showing the viscosity and viscosity of the contents. Diagrams showing the presence or absence of air bag phenomenon in relation to the length of the retention part, Figures 7-A, 7-B, and 7-
Figure C is a diagram showing the presence or absence of an air bag phenomenon in relation to the viscosity of the contents and the orifice passage, Figure 8 is an enlarged sectional view of the laminated structure of the wall of the tube container, and Figure 9 is a diagram showing other tube containers used in the present invention. Plan views showing examples of Figure 10-A, Figure 10-B and Figure 10-C
The figures are cross-sectional views showing several examples of cross-sectional shapes of orifice passages. DESCRIPTION OF SYMBOLS 1... Container, 2... Cap, 3... Contents, 4... Cylindrical body, 5... Shoulder, 6... Extrusion opening, 8... Orifice passage, 9... Offset part, 10... Retention part.

Claims (1)

[Scope of Claims] 1. An extrusion package consisting of a flexible plastic hollow container and a viscous content filled in the container, wherein the hollow container has a flexible cylindrical body, the body consisting of a narrowed orifice passage connected to the orifice passage through a shoulder, and a retention part connected to the orifice passage through a step and having an extrusion port at the tip, the viscous contents having a viscosity of 1000 to 250000 centipoise, The viscosity of the content is η (centipoise), the cross-sectional area of the orifice passage is S ₀ (square millimeter), the cross-sectional area of the retention section is S ₁ (square millimeter), the axial dimension of the retention section is l (mm), the cylinder When the compressive recovery force of the unfilled body is E (grams), the following formula logη≧logl−logS ₁ /S ₀ +5.45 logη≧0.588logS ₀ +0.764logE+2.30S ₁ /S ₀ ≧ 2. A package for extrusion of contents, characterized in that the container dimensions and the viscosity of the contents are within a range that satisfies the following.