JP2006123918A - Closed type laminate tube, and unsealing cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and adequately open a closed type laminate tube of the diameter below ϕ 13 mm by reducing the difference in the stress resistance during the unsealing between a pointed head of a conical body having a ridge portion and a top face of a base part. <P>SOLUTION: In an unsealing cap for a closed type laminate tube, a screw part 5 to be screwed to a tip part of the tube and an unsealing recessed part 7 opened in the other end side are demarcated by a partition member 6. A pointed head shaped unsealing projection 10 is erected at the center on the unsealing recessed part 7 side of the partition member 6. The unsealing projection 10 has the diameter slightly smaller than the diameter of the tip part of the laminate tube, and comprises a base part 12 having a steep shoulder part, and a conical body 15 having three or four ridge portions 14 rising the shoulder part of the base part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a closed-type laminate tube having a diameter of a barrel portion of less than φ13 mm and an opening cap thereof used for containers such as pharmaceuticals, quasi drugs, cosmetics, and processed foods.

One of the main markets for tube containers is the pharmaceutical market. In general, in the pharmaceutical field, in addition to the strict requirements for tube quality, function and performance, there are unique needs in this field. For example, as a specification of a tube container, a destructive opening type sealing structure is desired from the viewpoint of tampering prevention and safety, and a closed tube is employed.
The material of the tube container can be roughly divided into a metal (particularly aluminum tube) and a resin (particularly laminated tube). The former is excellent in barrier properties, but on the other hand, it is inferior in usability and portability because it is inferior in flexibility and is difficult to use if it is wrinkled and is easy to tear. In addition, because of the disadvantage that it is difficult to make beautiful fine printing due to the fact that most of the printing by dry offset printing occupies the relationship between printing after creating the shape outside the cylinder. In recent years, conversion to laminate tubes has been attempted in the pharmaceutical field. . From such a viewpoint, a closed laminate tube (membrane tube) is used as a tube container in the pharmaceutical field.

  For the closure membrane of the closed laminate tube, aluminum foil and plastic were bonded together for reasons of the structure of the tube, the manufacturing process including suitability for deep drawing of the membrane cup, and functional properties including resistance to physical properties. A laminated material is used, and it has a property that the breaking stress is high and it is difficult to open it as compared with a closing film of an aluminum tube made of aluminum alone. That is, as shown in FIG. 9 (a), the closing membrane is formed from a cup-like closing membrane 62 obtained by punching and drawing a laminated sheet from the mouth portion 64 of the tube container as shown in FIG. 9 (b). Attached to the inside of the shoulder 65. Here, it is technically difficult to develop a closure film laminate material that can withstand severe deep drawing and does not break during processing, and the higher the stability, the more the closure film 62 becomes a closure film 62 that is difficult to open. An off relationship is inherent. In order to solve such a problem at the time of opening, a so-called biting portion 66 is provided on the tube side, and the adhesive force between the closing film 62 and the tube main body (head) enters from the mouth portion 72 when opening. Measures are taken to firmly hold the projection film 70 so that it does not fall off due to the stress resistance received by the closing film 62 (see Patent Document 1).

  On the other hand, as for the opening needle, in the case of the laminated membrane made of laminated material, the mere conical needle that has been used for aluminum tubes until now does not stretch and cannot be completely broken, so a dedicated blade needle is adopted. (Patent Document 2). The function of this needle is to first divide the closure membrane radially with the blade (cutting teeth) of the needle tip (first stage), and then the divided closure membrane is pushed back to the mouth side by the discharge of the contents to open the opening portion. In order to prevent the blockage from being blocked, there is a function (second stage) of fixing and fixing the divided piece by spreading it by the cylindrical base of the needle. In other words, it is divided into a first resistance that tears the closure membrane in the first stage, and a second resistance that spreads and fixes the closure membrane segment that was cut in the second stage outward. The second resistance value is higher.

On the other hand, in the pharmaceutical field etc., a small capacity tube is desired because the contents are expensive, the contents are used little by little, and safety such as aging is regarded as important. Due to such demand, a small-capacity aluminum tube having a body diameter of 11.1 mm is used. On the other hand, as a laminate tube, a tube having a trunk diameter of 13 mm is the smallest at present. A tube with a body diameter of φ13 mm is usually used for a tube with an internal capacity of 5 cc, but as an alternative to a small capacity tube, a product in which a φ13 mm laminate tube is filled with contents of 2 to 3 cc is commercially available. Currently.
However, in a laminated tube having a diameter of 13 mm, if the internal volume is set to 2 to 3 cc, it is necessary to shorten the tube length of the tube. Therefore, there is a problem that it is not suitable for a general-purpose filling machine for filling the contents. Moreover, when the length was filled with a long cylinder, the porosity increased, causing problems such as deterioration of the contents. Furthermore, in the φ13 mm tube, a problem has been pointed out that the ratio of the bulk remaining amount in the shoulder back portion is higher than that of the φ11.1 mm tube. Therefore, utilization of a laminate tube having a diameter of less than 13 mm is desired.

In order to use a laminate tube having a diameter of less than 13 mm as a small-capacity tube, the problem at the time of opening the closing membrane must be solved. First, the material of the closing membrane used for the laminated tube must be a laminated material similar to that of the tube body. In order to integrate the head and the closure membrane in the laminated tube, it must be based on heat fusion by melting and latent heat, so it cannot be bonded with aluminum alone. Secondly, it is known that a laminate tube having a multilayer structure such as polyethylene has a higher breaking stress than an aluminum tube and is difficult to open.
Laminate tube less than φ13mm is much smaller than tube of φ13mm and larger in tube diameter, trunk length, cap size, opening size, cap opening needle size, and difficult to hold. Difficult to handle and difficult to apply gripping force.

When an opening test was actually performed using a laminate tube having a diameter of 11.1 mm, a plurality of users were confirmed who stopped the opening by dividing the closing membrane with a blade (first stage). For example, in the case of a 25 mm diameter laminated tube (caliber φ8.0 / needle diameter φ7.6), which is said to be a standard size, the container and cap are easy to hold, force is easily applied, and the unsealed state is easy to check visually. The user who stopped opening was not confirmed.
This is due to the fact that the second stress resistance generated in the initial stage of the second stage is larger than the first stress resistance generated in the first stage. That is, in a small-capacity laminated tube of φ11.1 mm or the like, the difference between the second stress resistance and the first stress resistance has a great effect on the user, and the user can open the feel caused by the second stress resistance. From the misunderstanding, it was found that the above problems occur. Thus, when opening is stopped only in the first stage, the opening diameter becomes extremely small, which leads to a problem that the contents cannot be squeezed out sufficiently. In particular, there is a concern that patients who use pharmaceuticals or elderly people cannot fully open the package.
Actual application No. 60-1558584 Utility Model Registration No. 1927686

  The present invention has been made in order to eliminate the above-described disadvantages of the prior art, and the object of the present invention is to reduce the difference in stress resistance at the time of opening between the tip of the cone having the ridge line and the upper surface of the base. By doing so, it is possible to easily and appropriately open a closed laminate tube having a diameter of less than 13 mm.

The present invention employs the following configuration in order to solve the above problems.
(1) In an opening cap for a laminated tube in which a diameter of a body portion provided with a passage closing film at the tip portion is less than φ13 mm, a screw portion that is screwed to the tip portion of the laminate tube and a partition member are provided to provide the screw. A concave portion is formed on the opposite side of the portion, a point-like opening projection is erected in the center of the concave portion of the partition member, and the opening projection has a diameter slightly smaller than the diameter of the tip of the laminated tube The opening protrusion has a base portion having an angled shoulder portion and a cone-shaped body having three or four ridges rising from the shoulder portion of the base portion. An opening cap for a closed laminate tube.

  The cap according to the present invention has a function of unscrewing the tip of the tube at the time of opening, inverting and inserting the tip of the cone-shaped body through the opening of the tube, and perforating the inner closure membrane. Have. The closing membrane is cut by three or four ridges and divided into small pieces. Thereafter, each of the small pieces is pressed against the back side of the mouth portion by the base of the opening projection, so that it is not pushed back when the contents are pushed out of the tube to close the passage and narrow the opening. .

  Further, by providing an angle to the shoulder portion of the opening projection as described above, the first stress resistance generated when the cone tip perforates the closure membrane and the shoulder portion when expanding the closure membrane. The difference from the generated second stress resistance can be reduced. That is, as shown in FIG. 10, in the shoulder portion of the conventional opening projection, the second stress resistance is generated on the entire upper surface (shaded portion) of the base portion. A second stress resistance is generated on the outer circumferential surface slightly outside the base of the body. Thereafter, the closure membrane is pushed open by the curved surface of the shoulder portion, so that the stress resistance applied to the closure membrane can be dispersed along the curved surface of the shoulder portion.

(2) The opening cap for a closed laminate tube according to claim 1, wherein the shoulder has an angle of 60 ° or more and less than 90 °.
FIG. 1 is a view showing an example of an opening projection erected in the center on the concave side (however, the present invention is not limited to this form). Fig.1 (a) is a top view of the protrusion for opening provided with the cone-shaped body which has three ridgeline parts. FIG. 1B is a sectional view taken along arrows (b)-(b) in FIG. Further, as shown in FIG. 1B, the angle of the shoulder is a point P in the shoulder 1 (the circumference of the inscribed circle passing through the concave portion of the base of the cone 2) and the inclination of the shoulder from the base. It is an angle A formed by connecting the point where the start of the line starts with two lines that oppose each other on the circumference.

  The reason why the shoulder angle is set to 60 ° or more is that the design is preferable in view of the depth of the concave portion of the cap. That is, in order to enlarge the opening of the closure membrane, at least the vicinity of the base of the base needs to have a diameter substantially the same as the diameter of the tip of the tube body, but if it is 60 ° or less, it is necessary to design the recess deeply. Occurs. In particular, in a tube container having a body diameter of φ11.1 mm, if the depth of the recess is 6.0 mm, if the depth is less than 60 °, the length from the base of the base to the blade edge is equal to or greater than the depth of the recess. There is a possibility that it may cause trouble during storage and use of the tube. On the other hand, the reason why the angle of the shoulder portion 1 is less than 90 ° is that when the angle exceeds 90 °, the difference between the first stress resistance and the second stress resistance becomes large, which is not preferable.

(3) The opening for a closed laminate tube according to claim 1 or 2, further comprising an opening projection having a base diameter that is at least 0.3 mm narrower than the diameter of the tip of the laminate tube. It is a cap.
(4) The first resistance stress generated when the tip of the cone of the opening projection divides the closing film of the laminate tube, and the second generated when the shoulder at the base of the opening projection expands the opening. The closed cap for a laminated laminate tube according to any one of (1) to (3), wherein a difference from the resistance stress is 1.7 kgf or less.

(5) A closed laminate tube having a body diameter of less than φ13 mm, wherein the opening cap for a closed laminate tube described in any one of (1) to (4) is screwed. .
There are various methods for producing a closed-type laminated tube, and examples include Japanese Patent Application No. 52-12375 (manufacturing method and apparatus for body part) and Japanese Patent Application No. 55-94065 (simultaneous molding method for head part and apparatus thereof). It is done.

  By reducing the difference in stress resistance at the time of opening between the top of the cone-shaped cone-shaped body and the upper surface of the base, there is an effect that the opening of the closed laminate tube having a body diameter of less than φ13 mm can be easily and appropriately performed. .

FIG. 2 shows an example of an opening cap for a closed laminate tube according to the present invention. 2A is a plan view, FIG. 2B is a cross-sectional view taken along arrows (b)-(b) in FIG. 2A, and FIG. 2C is a bottom view.
FIG. 2 shows an unsealing cap 4 for a laminate tube in which the diameter of a body portion provided with a passage closing film on the mouth is φ11.1 mm. The unsealing cap 4 has a screw portion 5 that is screwed to a tip portion of a laminate tube (not shown), and a concave portion 7 that is partitioned by providing a partition member 6 on the opposite side of the screw portion 5. A point-like opening projection 10 is erected at the center of the concave portion 7 side of 6. The opening projection 10 has a diameter slightly smaller than the diameter of the mouth end portion of the laminated tube, and a base portion 12 on which a shoulder portion 11 having an angle is formed, and a shoulder portion 11 of the base portion 12 formed integrally with the base portion 12. A conical body 15 having a ridge line portion 14 is provided.

  3A to 3D show an example of another embodiment according to the present invention. In FIG. 3, (a) is a perspective view of the cap as viewed from above, (b) is a plan view, (c) is a cross-sectional view taken along (c)-(c) of (b), (D) is the perspective view which looked at the cap from the bottom. As shown in FIG. 3 (c), the cap 20 is formed with a screw portion 23 that is screwed to a mouth portion of a laminate tube (not shown). As shown in FIGS. 3B and 3C, a concave portion 22 having an opening projection 25 formed at the center is provided on the opposite side of the screw portion 23. Further, as shown in FIG. 3C, the screw portion 23 and the concave portion 22 of the cap are partitioned by a partition member 24. In the center of the recess 22 of the partition member 24, a point-like opening projection 25 is erected. The base 28 of the unsealing projection 25 is formed in a columnar shape and has a diameter slightly smaller than the diameter of the tip of the tube (not shown). Further, the shoulder 27 having an angle at the base 28 is bent. The shoulder 27 has an angle of 68 °. The shoulder 27 may be bent as shown in FIG. 3C or may be a flat surface.

  A conical body 32 having four ridge lines 30 is formed to rise from the shoulder 27. The tip of the unsealing projection 25 is basically conical as shown in FIG. 3A, and four ridge lines 30 are formed by four concave curved portions 36. And as shown in FIG.3 (c), the ridgeline part 30 is formed in the bulging arc surface shape as a whole. This ridge line part 30 is divided into a and b parts, and the a part near the root increases the bulge radius to increase stability, and the b part near the tip is sharpened with the opposite radius to easily tear the closure membrane. It is preferable to do this. The ridge line portion may be linear.

(Manufacture of closed laminate tube)
FIG. 4 shows a closed laminated tube 38 used in the embodiment according to the present invention. Such a closed laminate tube 38 is manufactured by performing surface printing on a laminated raw fabric, winding the laminated raw fabric around a mandrill, sealing the body portion 40, and compression-molding the head portion 41 at the tip of the mandrill. . At this time, a closing membrane (not shown) was heat-sealed to the back side of the mouth portion of the tube container. As the laminated raw material, a multilayer structure composed of polyethylene-copolymer-aluminum-copolymer-polyethylene was adopted from the inner layer. The closed-type laminate tube 38 was filled with an oral ointment and sealed. The closed laminate tube 38 had a body diameter of 11.1 mm and an opening diameter of 3.0 mm.

As the closing membrane, a bottomed cup-shaped member in which PET / AL / PET / L-LDPE was laminated from the inner layer was manufactured in advance. Of course, the layered structure of the closure membrane can withstand deep drawing, has sufficient shape retention after molding, has heat-weldability with the head material, is compatible with the contents, and is reliably opened by the opening protrusion. If possible, other structures may be adopted.
Four closed-type laminate tubes 38 manufactured in this way were prepared.
In the same process, four laminate tubes 38 having different body diameters were prepared. They were φ20 mm, φ25 mm, φ28 mm, and φ35 mm, respectively.

(Manufacture of caps)
The basic structure of the cap is substantially the same as that shown in FIG. 2 except for the shape of the opening projection. This unsealing cap has a screw portion that fits into the mouth portion of the laminate tube, and a concave portion that is partitioned by providing a partition member on the opposite side, and has a pointed opening at the center of the concave portion side of the partition member. Protrusion for standing, and the opening protrusion has a diameter slightly smaller than the diameter of the mouth of the laminated tube, and a base with an angled shoulder formed integrally with the shoulder of the base It is provided with a cone having three ridge lines. The depth of the recess is 6.0 mm. About the opening cap which has such a basic structure, the shape of the protrusion for opening was made into the following Examples 1 and 2 and Comparative Examples 1 and 2, and the opening resistance value was compared.

Example 1
The cap used in Example 1 will be described with reference to FIGS. The conical body in the opening protrusion has three concave curved portions 42 and three ridge line portions 44. The length of the cone in the axial direction was 2.5 mm, and the diameter of the inscribed circle at the base of the cone was φ1.1 mm. The shoulder 46 was formed at an angle of 68 °. Further, the ridge line portion 44 is formed in a generally bulging arc surface shape, and the ridge line portion is divided into a and b portions as shown in FIG. The axial length of the part a near the root is 1.3 mm, and the part b is 1.2 mm. The axial length from the concave curved portion 42 to the end of the shoulder portion is 1.1 mm, and the length of the cylindrical portion of the base portion is 3.3 mm. The diameter of the base is φ2.8 mm. The curvature of the ridge line portion and the like is as shown in FIG. 5C, which is a cross-sectional view taken along arrows (c)-(c) in FIG.
An unsealing test was conducted using the cap according to Example 1 and the closed laminate tube having a trunk diameter of φ11.1 mm manufactured as described above. In the opening test, a tube is fixed to a mandrel oriented in the vertical direction, a cap is attached to the push shaft of a push-pull gauge (both shaft springs only), and the stress when tearing the closure membrane with the needle tip is the first resistance value. Further, each stress was measured as the second resistance value when the divided membrane was further expanded. Each stress resistance value was measured at points A to F in FIG. In particular, point A was the first stress resistance value and point C was the second stress resistance point. Each measurement was performed 10 times.

Example 2
The basic structure is substantially the same as that of the opening projection in the first embodiment. However, the diameter of the base was formed to φ2.6 mm.
An unsealing test was performed using the cap according to Example 2 and the above-described closed-type laminated tube having a trunk diameter of φ11.1 mm. The unsealing test was performed by measuring the resistance value in the same manner as in Example 1.

Comparative Example 1
The cap of the comparative example 1 is demonstrated based on FIG.5 (d) and (e). The conical body in the opening protrusion has three concave curved portions and three ridge lines. The length of the cone in the axial direction was 2.0 mm, and the diameter of the inscribed circle at the base of the cone was φ1.1 mm. The shoulder angle was 90 °. Moreover, the ridge line part is formed in the shape of a bulging arc surface as a whole, and the ridge line part is divided into a and b parts. The axial length of the part a near the root is 0.8 mm, and the part b is 1.2 mm. The axial length from the concave curved portion to the terminal end of the shoulder portion is 0.6 mm, and the length of the cylindrical portion of the base portion is 3.7 mm. The diameter of the base is φ2.8 mm.
An unsealing test was performed using the cap according to Comparative Example 1 and the closed laminate tube having a trunk diameter of φ11.1 mm manufactured as described above. The unsealing test was performed by measuring the resistance value in the same manner as in Example 1.

Comparative Example 2
The basic structure of the opening protrusion in Comparative Example 1 is substantially the same. However, as shown in FIGS. 5 (f) and 5 (g), the shoulder angle was 120 °.
An unsealing test was performed using the cap according to Comparative Example 2 and the closed laminate tube having the trunk diameter of φ11.1 mm manufactured as described above. The unsealing test was performed by measuring the resistance value in the same manner as in Example 1.

(Test results)
FIG. 6 shows stress resistance values at points A and C among the above test results. In FIG. 6, Δ is the first stress resistance value measured at point A, and ◯ is the second stress resistance value measured at point C. As is clear from the results shown in FIG. 6, it was found that Examples 1 and 2 had a smaller difference between the first stress resistance value and the second stress resistance value than Comparative Examples 1 and 2. Further, it was found that the difference in the stress resistance value was smaller in Example 2 than in Example 1. Furthermore, the maximum resistance difference between the first stress resistance value and the second stress resistance value in Example 1 was 1.7 kgf.

Moreover, the average value of the stress resistance value from A point to F point was shown as the line graph in FIG. A line connecting the average measurement points of Δ is a line graph showing the test results of Example 1, and a line connecting the average measurement points of □ is a line graph showing the test results of Comparative Example 2. As shown in this figure, there is almost no difference in the first stress resistance value at point A, but there is a difference in the second stress resistance value at point C. The average of the first stress resistance value in Example 1 was 1.8 kgf, and the average value of the second stress resistance value was 2.26 kgf. The difference is 0.46 kgf. On the other hand, the average of the first stress resistance value in Comparative Example 2 is 1.95 kgf, and the average of the second stress resistance value is 3.59 kgf. The difference is 1.64 kgf. It was found that Example 1 had a smaller difference between the first stress resistance value and the second stress resistance value than Comparative Example 2.
(Comparison test with laminated tubes with different body diameters)
Next, the results of measuring the stress resistance values of the conventional laminate tube and Examples 1 and 2 are shown in FIG. The tubes used as comparative examples here have a tube barrel diameter φ20 mm (Comparative Example 3), a barrel diameter φ25 mm (Comparative Example 4), a barrel diameter φ28 mm (Comparative Example 5), and a trunk diameter φ35 mm (Comparative Example 6).

As is clear from the results shown in FIG. 8, it was found that Examples 1 and 2 had a smaller difference between the first stress resistance value and the second stress resistance value than Comparative Examples 3 to 6.
In addition, the tubes of Comparative Examples 3 to 6 were tubes having a large opening, and even if the first stress resistance value and the second stress resistance value were different, there was no problem in normal use. This is because a tube container having a tube barrel diameter of φ20 mm or more is easy to hold and forceful, and it is easy to visually confirm the state of the opened hole.

(Openability panel test)
-Direct contrast test 1-
An openability panel test was performed using the cap of Example 1 and the cap of Comparative Example 2. 20 caps of each of Example 1 and Comparative Example 2 were produced, and 20 panelists (13 men and 7 women) opened a tube container having a diameter of 11.1 mm at room temperature. A questionnaire was sent to each panel after opening, and the evaluation results were recorded. Evaluation is based on the number of statistics when selecting one from five levels: the cap of Example 1 is good, the cap of Example 1 is somewhat good, the same, the cap of Comparative Example 2 is somewhat good, and the cap of Comparative Example 2 is good It is. The evaluation results are summarized in Table 1 below.

表１より明らかなように使用者の感触としては、実施例１のキャップの方が比較例２のキャップより閉鎖膜の開封が容易であることが分かった。

As is clear from Table 1, the user feels that the cap of Example 1 is easier to open the closure membrane than the cap of Comparative Example 2.

-Direct contrast test 2-
Using the cap of Example 2 and the cap of Comparative Example 2, an openability panel test was conducted. The caps of Example 2 and Comparative Example 2 were manufactured one by one, and 20 panelists (13 men and 7 women) opened the tube container with a diameter of 11.1 mm at room temperature. A questionnaire was sent to each panel after opening, and the evaluation results were recorded. Evaluation is based on the number of stats when one is selected from five levels: the cap of Example 2 is good, the cap of Example 2 is somewhat good, the same, the cap of Comparative Example 2 is somewhat good, and the cap of Comparative Example 2 is good It is. The evaluation results are summarized in Table 2 below.

表２より明らかなように使用者の感触としては、実施例２のキャップの方が比較例２のキャップより閉鎖膜の開封が容易であることが分かった。

As apparent from Table 2, it was found that the cap of Example 2 was easier to open the closure membrane than the cap of Comparative Example 2 as the user's feel.

-Indirect contrast test-
Using the caps of Example 1, Example 2, Comparative Example 1 and Comparative Example 2, an openability paneler test was conducted. Each of the caps was manufactured one by one, and 25 panelists (16 men and 9 women) opened a tube container having a diameter of 11.1 mm at room temperature. A questionnaire was sent to each panel after opening, and the evaluation results were recorded. The evaluation is the number of statistics when the ease of opening the closure membrane is selected from one of four levels: good, normal, slightly bad, and bad. The evaluation results are summarized in Table 3 below.

表３より、実施例１及び実施例２における「良い」の人数がそれぞれ１１名と１０名であり、比較例１の５名及び比較例２の０名を上回っている。

From Table 3, the numbers of “good” in Example 1 and Example 2 are 11 and 10, respectively, which exceeds 5 in Comparative Example 1 and 0 in Comparative Example 2.

  The present invention is a closed laminate tube having a trunk portion with a diameter of less than 13 mm and an opening cap thereof, and is used as a container for pharmaceuticals, cosmetics, processed foods and the like.

It is a figure which shows an example of the protrusion for opening of the cap which concerns on this invention. (A) is a top view, (b) is a (b)-(b) arrow sectional drawing in (a) figure. It is a figure which shows an example of the opening cap for closed type laminate tubes which concerns on this invention. (A) is a plan view, (b) is a cross-sectional view, and (c) is a bottom view. An example of other embodiment which concerns on this invention is shown. (A) is the perspective view which looked at the cap from the upper part, (b) is a top view, (c) is (c)-(c) arrow sectional drawing of (b), (d) is (d) It is the perspective view which looked at the cap from the bottom. It is a figure which shows the closed type laminate tube used for the Example and comparative example which concern on this invention. It is a figure which shows the basic structure of the cap used for the Example and comparative example which concern on this invention. (A)-(c) is a figure which shows the structure of Example 1. FIG. (D) And (e) is a figure which shows the structure of the comparative example 1. FIG. Further, (f) and (g) are diagrams showing the structure of Comparative Example 2. It is a graph which shows the difference of the 1st stress resistance value in Example 1, 2 and Comparative Examples 1, 2, and the 2nd stress resistance value. It is a line graph which shows the average value of the stress resistance value of Example 1 and Comparative Example 2. It is a graph which shows the difference of the 1st stress resistance value in Example 1, 2 and Comparative Examples 3-6, and a 2nd stress resistance value. It is explanatory drawing which shows the mounting state of a closure membrane. (A) is a perspective view of a closure membrane, (b) is a partial sectional view in which the closure membrane is attached to a tube container. It is a top view which shows the site | part in which the 2nd stress resistance arises in the shoulder part of the conventional opening protrusion.

Explanation of symbols

1,11,27,65 Shoulder portion 2,15 Conical body 4,67 Opening cap 5,23 Screw portion 6,24 Partition member 7,22,68 Recess 10,25,70 Opening projection 12,28 Base portion 14, 30 Crest Line 38 Closed Type Laminate Tube 40 Body Body 41 Head 62 Closure Membrane 66 Biting Part

Claims (5)

In an opening cap for a laminated tube in which the diameter of the body portion provided with a passage closing film at the tip portion is less than φ13 mm, a screw portion that is screwed to the tip portion of the laminate tube and a partition member are provided to oppose the screw portion. A concave portion is formed on the side, a point-like opening projection is erected at the center of the concave portion of the partition member, and the opening projection has a diameter smaller than the diameter of the mouth portion of the laminate tube, The opening projection includes a base having an angled shoulder and a conical body having three or four ridges rising from the shoulder of the base. Opening cap. The opening cap for a closed laminate tube according to claim 1, wherein the shoulder has an angle of 60 ° or more and less than 90 °. The opening cap for a closed laminate tube according to claim 1 or 2, further comprising an opening projection having a base diameter smaller by at least 0.3 mm than the diameter of the tip of the laminate tube. The first resistance stress that occurs when the tip of the cone of the opening protrusion divides the closure membrane of the laminate tube, and the second resistance stress that occurs when the shoulder at the base of the opening protrusion expands the opening The opening cap for a closed laminate tube according to any one of claims 1 to 3, wherein the difference between the opening cap and the tube is 1.7 kgf or less. A closed laminate tube having a diameter of less than 13 mm, wherein the closure cap for a closed laminate tube according to any one of claims 1 to 4 is screwed.

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