JP2005096774A - Closure member of packaging container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a closure member, of which the engagement force and airtightness are improved without complicating a structure of the closure member to reduce leaks of a content. <P>SOLUTION: The closure member 40 of a packaging container is engaged with a mouthpiece of the container, and a bulged part 42 of the closure member 40 is pressed to separate a skirt 41 of the closure member 40 in deformation from the mouthpiece. The closure member 40 has nails 43, and at least part of the shoulder to the lower end of the edge of each nail in the circumference is formed to slope in a given direction. With the sloped edges, a distance between the lower end of one edge and the vicinity to the shoulder of another edge becomes relatively longer than in a case where the nails 43 are provided in the same number but are not sloped. As a result, when an inner pressure is applied to the closure member 40 to pressed it in a direction of removal, a force to widen the nails 43, which is a result of the bulging of a cylindrical part 11b of the mouth piece 11, acts differently on the nails 43 in comparison with the case of the nails with no slope. Thus the closure member 40 retains a higher engagement force and airtightness without losing openability. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lid member for a packaging container, and particularly relates to a lid member to be mounted on a base portion of a packaging container such as a metal can.

  A lid member (so-called “B-shaped cap”) of a type that can be removed by opening the hem by pressing the substantially central portion is attached to a base portion such as an 18 liter can. Naturally, this type of lid member needs to have a high fitting force (fitting property) so as to be able to withstand an increase in internal pressure accompanying the expansion of the contents.

For example, a plurality of conventionally known lid members (outer diameter 50.5 mm, inner diameter 47.2 mm, height (height up to the shoulder)) according to JIS standard Z1607: 2003 B-type 50 claw type lid / cap 0.0mm) is attached to the base part through a sheet packing having a thickness of 2.4 to 2.5 mm, and when a force is applied to the substantially central part from the inner surface side, there is some variation, but about 9 kg to about 12 kg It has a fitting force. This is the fitting force to the cap part of the lid member alone, and it will be higher when the protector is mounted.Therefore, there is no problem even in such a range, but considering the increase in internal pressure due to shaking during transportation in trucks etc. Then, the development of a lid member having a higher fitting force without impairing the openability is always desired. In addition, this type of lid member is always required to improve airtightness in order to increase the fitting force and at the same time reduce leakage of contents from the gap between the lid member and the base as much as possible. .
Japanese Industrial Standard “Metal plate lid / clasp” JIS Z 1607: 2003

  The present invention has been made in view of the above-described points, and can increase the fitting force without complicating the structure and without impairing the openability, and improve the airtightness of the contents. It is an object to provide a lid member capable of reducing leakage.

  In order to solve the above-mentioned problems, the present inventors have intensively studied. As a result, each length along the circumferential direction of the gap between the claw part forming the skirt part and the adjacent claw part edge, or the claw By limiting the shape of the edge of the part to a range different from that conventionally used or a predetermined structure, the fitting force is increased without complicating the structure, without impairing the openability, and airtightness. As a result, it was found that leakage of contents can be reduced, and the present invention has been completed.

That is, in the present invention according to claim 1, a skirt protruding in one direction from the peripheral shoulder, and a bulge formed so as to bulge in a direction opposite to the skirt from the shoulder to a substantially central portion. And a lid member of the packaging container that is fitted in the base part of the packaging container while the hem part is deformed in a direction away from the base part by pressing the bulging part,
The skirt is formed with a plurality of claw portions in the circumferential direction, and the maximum length along the circumferential direction of each claw portion is 1/10 to 1 / 7.5 of the circumference. A packaging container, wherein a maximum gap between adjacent edges along the circumferential direction of each claw portion is set to 1 mm or less in a non-pressed state of the bulging portion. A lid member is provided.
In this invention of Claim 2, the maximum length along the circumferential direction of each said nail | claw part is formed in the range of 1/10-1 / 8.5 of the circumference. A lid member for a packaging container according to Item 1 is provided.
In this invention of Claim 3, the maximum space | interval of the clearance gap between the adjacent edges along the circumferential direction of each nail | claw part is 1/20 of the length of a nail | claw part in the non-pressing state of the said bulging part. The lid member for a packaging container according to claim 1 or 2 is set as follows.
In this invention of Claim 4, the maximum space | interval of the clearance gap between the adjacent edges along the circumferential direction of each nail | claw part is 1/20 of the length of a nail | claw part in the non-pressing state of the said bulging part. The lid member for a packaging container according to claim 3, wherein the lid member is set to ~ 1/50.
The present invention according to claim 5 is a lid member satisfying the standards of B-type 40 or B-type 50 defined in JIS Z 1607: 2003 “Metal plate lid / cap”, and the number of each claw portion is The lid member for a packaging container according to any one of claims 1 to 4, wherein the lid member is in a range of 8 to 9 sheets.
According to a sixth aspect of the present invention, there is provided the packaging container lid member according to the fifth aspect, wherein the number of the claw portions is nine.
In the present invention described in claim 7, the lid member satisfies the standard of B-type 70 defined in JIS Z 1607: 2003 “Metal plate lid / cap”, and the number of each claw portion is 11 There is provided a lid member for a packaging container according to any one of claims 1 to 4.
In this invention of Claim 8, the skirt part protruded in one direction from the shoulder part of a periphery, and the bulging part formed so that it may bulge in the opposite direction to a skirt part from this shoulder part to a substantially central part. A wrapping container lid member that is fitted in the base part of the packaging container while the hem part is deformed in a direction away from the base part by pressing the bulging part,
The skirt portion is formed with a plurality of claw portions in the circumferential direction, and at least a part from the shoulder portion to the lower end portion of each edge along the circumferential direction of each claw portion is inclined. A lid member for a packaging container is provided.
In this invention of Claim 9, from the shoulder part of each edge along the circumferential direction of each said nail | claw part to a lower end part inclines in the fixed direction, The packaging of Claim 8 characterized by the above-mentioned. A container lid member is provided.
In this invention of Claim 10, the maximum length along the circumferential direction of each said nail | claw part is formed in the range of 1/10-1 / 7.5 of the circumference, The circumferential direction of each nail | claw part The lid member for a packaging container according to claim 8 or 9, wherein the maximum gap of the gap between adjacent edges along the line is set to 1 mm or less in a non-pressed state of the bulging portion. To do.
In this invention of Claim 11, the maximum length along the circumferential direction of each said nail | claw part is formed in the range of 1/10-1 / 8.5 of the circumference. Item 10. A lid member for a packaging container according to Item 10.
In this invention of Claim 12, the largest space | interval of the clearance gap between the adjacent edges along the circumferential direction of each nail | claw part is 1/20 of the length of a nail | claw part in the non-pressing state of the said bulging part. The lid member for a packaging container according to claim 10 or 11, which is set as follows.
In this invention of Claim 13, the largest space | interval of the clearance gap between the adjacent edges along the circumferential direction of each nail | claw part is 1/20 of the length of a nail | claw part in the non-pressing state of the said bulging part. The lid member for a packaging container according to claim 12, wherein the lid member is set to ~ 1/50.
The present invention according to claim 14 is a lid member satisfying the standards of B-type 40 or B-type 50 defined in JIS Z 1607: 2003 “Metal plate lid / cap”, and the number of each claw portion is The lid member for a packaging container according to any one of claims 8 to 13 is provided.
According to a fifteenth aspect of the present invention, there is provided the lid member for a packaging container according to the fourteenth aspect, wherein the number of the claw portions is nine.
The present invention described in claim 16 is a lid member that satisfies the standard of B-type 70 defined in JIS Z 1607: 2003 “Metal plate lid / cap”, and the number of each claw portion is 11 A lid member for a packaging container according to any one of claims 8 to 13 is provided.

  According to the invention of any one of claims 1 to 7, the hem portion is deformed in a direction away from the base portion by pressing the bulging portion while being fitted to the base portion of the packaging container, and In the lid member of the packaging container formed with a plurality of claw portions in the circumferential direction, the hem portion has a predetermined maximum length along the circumferential direction of each claw portion of the lid member, which is different from the conventional one. It sets to length, and the maximum space | interval of the clearance gap between the adjacent edges along the circumferential direction of each nail | claw part is set to the predetermined length different from the past. Accordingly, the lid member has a higher fitting force, and can sufficiently cope with an increase in internal pressure due to shaking during transportation in a truck, etc., and at the same time can improve airtightness, so that the gap between the lid member and the base part can be increased. Leakage of contents can be reduced as much as possible. And by setting to the range as described in each claim, the openability of a cover member is not impaired. Further, the structure of the lid member is not complicated at all, and the manufacturing cost is not increased.

  According to the invention described in any one of claims 8 to 16, for a packaging which is fitted into the base part of the packaging container, and the hem part is deformed in a direction away from the base part by pressing the bulging part. In the lid member of the container, the skirt part is formed with a plurality of claw parts in the circumferential direction, and at least a part from the shoulder part to the lower end part of each edge along the circumferential direction of each claw part is formed. It is an inclined configuration. By inclining the edge, the distance from the lower end of one edge to the portion closer to the shoulder of the other edge is relatively longer than when the same number of claws are set. Become. For this reason, when the pressure is applied from the inside and pressed in the direction of withdrawal, the way in which the force applied in the direction of expanding the nail portion is changed by the swelling of the tube portion of the base portion is changed, so that the opening performance is not deteriorated. A lid member having fitting force and airtightness can be provided. Moreover, since the structure of the lid member is not complicated, the manufacturing cost does not increase.

Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings.
First, a lid member for a packaging container according to a first embodiment of the present invention will be described with reference to FIGS. As shown in these drawings, the lid member 1 has a skirt portion 3 protruding in one direction from the peripheral shoulder portion 2 and a bulge in a direction opposite to the skirt portion 3 from the shoulder portion 2 to a substantially central portion. The formed bulging part 4 is provided.

  More specifically, the lid member 1 is formed in a disc shape, and the skirt portion 3 protruding downward from the peripheral shoulder portion 2 in FIG. The bulging portion 4 that bulges out is formed in a substantially mountain shape from which a central circular top 4a protrudes. The skirt 3 is formed with a plurality of claw portions 5 in the circumferential direction. As shown in FIG. 3, the base 11 of the packaging container, for example, a metal can such as an 18-liter can, is constricted in the middle of the ring part 11 a that is caulked in the mouth that is opened in the main body of the metal can. And the peripheral surface of the front-end | tip part is formed including the cylinder part 11b which curved to the convex side on the outer side. The lid member 1 is fitted into the cylindrical portion 11b of the base portion 11 in a state where, for example, a circular sheet packing 20 as shown in FIG. In order to remove the lid member 1 from the base part 11, the top part 4 a of the bulging part 4 is pressed, and the skirt part 3 is expanded and deformed in a direction away from the cylindrical part 11 b of the base part 11.

  And the maximum length c along the circumferential direction of each claw part 5 of the lid member 1 is in the range of 1/10 to 1 / 7.5 of the circumference, more preferably 1/10 to 1 / 8.5. The maximum distance d between the adjacent edges along the circumferential direction of each claw part 5 is 1 mm or less in the non-pressed state of the bulging part 32, preferably the maximum of the claw part 5 The length c is set to 1/20 or less, more preferably 1/20 to 1/50. Here, the maximum length c along the circumferential direction of the claw portion 5 is the longest (widest) edge in the circumferential direction, except for a portion that is rounded between the edges of each claw portion 5. The intermediate portion is the length along the arc of each claw portion 5 measured along a plane parallel to the flat surface when the lid member 1 is placed on the flat surface. Further, the maximum gap d between the adjacent edges is the portion between the edges that are the most spaced apart in the circumferential direction except for the rounded portion of the edges of the adjacent claw portions 5. Similarly, when the lid member 1 is placed on a flat surface, the length along the virtual arc of each gap continuous to the claw portion 5 is measured along a plane parallel to the flat surface. is there.

  What is conventionally available on the market is that the maximum length c along the circumferential direction of each claw portion 5 of the lid member 1 is in the range of 1 / 11.5 to 1 / 10.5 of the circumference, The maximum gap d between the adjacent edges along the circumferential direction of the claw 5 is in a range of 1/11 to 1/17 of the maximum length c of the claw 5. That is, there is some variation when measuring a material satisfying the B-type 40 standard defined in JIS Z 1607: 2003 “Metal plate lid / cap”, but most of them have a maximum length c of the claw portion 5. The range is 12.29 to 12.41 mm, and the maximum gap d is 0.73 mm to 1.0 mm. In many of the B-type 50 standards, the maximum length c of the claw portion 5 is in the range of 14.22 to 14.55 mm, and the maximum gap d is 1.10 mm to 1.43 mm. is there. As a result, in any case, the number of the claw portions 5 forming the skirt portion 3 is ten.

  On the other hand, when it is defined in the numerical range as in the present embodiment, it satisfies any of the B type 40 and the B type 50 defined in JIS Z 1607: 2003 “Metal plate lid / cap”. The number of the claw portions 5 is 9 at the maximum and 8 at the minimum. As a result, the contact area between the claw part 5 and the base part 11 becomes larger than before, the resistance to the force that changes the shape is increased, and as a result, the fitting force and the airtightness are increased. The maximum length c along the circumferential direction of each claw part 5 is set to a range of 1/10 to 1 / 8.5 of the circumference, and between the adjacent edges along the circumferential direction of each claw part 5 When the maximum distance d of the gap is set to a range of 1/20 to 1/50 of the maximum length c of the claw portion 5 in the non-pressed state of the bulging portion 4, and the B-shaped 40 and In any case of the B shape 50, the number of the claw portions 5 can be adjusted to nine. When the number of the claw portions 5 is 8, the ease of the outward deformation of the claw portion 4 is reduced compared to the case of 9 pieces. In the case of satisfying the standards of 40 and B type 50, it is most preferable to set so that the number of the nail portions 5 is nine. However, if the maximum length c of the claw part 5 and the maximum gap d are outside the above ranges and the number of the claw parts 5 is 7 or less, the claw part 5 is moved outward when the bulging part 4 is pressed. Impairs the ease of deformation.

  In addition, there is a B-type 70 as defined in JIS Z 1607: 2003 “Metal plate lid / cap”, but all of the commercially available ones have twelve nail portions 5 in number. The length c is in the range of 1/13 to 1/12. Even in this case, if the numerical value range is set as in the present embodiment, the number of the claw portions 5 becomes 11, and the fitting force and the air tightness are improved without increasing the pressing force required for opening the lid. Can do.

  Next, a lid member for a packaging container according to a second embodiment of the present invention will be described with reference to FIG. The lid member 40 is formed in a disc shape, like the lid member 1 of the previous embodiment, the skirt portion 41 is formed to be slightly curved outward, and the bulging portion 42 has a circular shape in the center. The top part 42a is formed in a flat and substantially chevron shape. The skirt 41 is formed with a plurality of substantially rectangular claw portions 43 in the circumferential direction. As shown in FIG. 4C, the lid member 40 is also deformed by pressing the bulging portion 42 to open the hem portion 41 in a direction away from the base portion 11 of FIG. In this embodiment, the shoulder portion to the lower end portion of each edge along the circumferential direction of each claw portion 43 in the skirt portion 41 of the lid member 40 is inclined in a certain direction. In addition, even if all from the shoulder part of each edge along the circumferential direction of each nail | claw part 43 to a lower end part is not inclined, at least one part should just be inclined. Further, the end edge can be inclined in a substantially spiral shape (curved shape), and such a configuration is also the “mode in which at least a part of the end edge is inclined” in the present invention. "include. However, in consideration of ease of manufacture and the like, as shown in FIG. 4, it is preferable to incline in a certain direction from the shoulder portion to the lower end portion of each edge along the circumferential direction of each claw portion 43. (However, when there is a round at the shoulder or lower end of the edge, it means that the part other than that part is inclined in a certain direction).

  What has been used conventionally extends vertically from the shoulder portion to the lower end portion of each edge along the circumferential direction of each claw portion 43 in the skirt portion 41 of the lid member 40, but in the present embodiment, Thus, by making it the shape which inclined at least one part of the edge, while being able to exhibit higher fitting force, airtightness can be improved. By tilting the edge, the distance from the lower end of one edge to the portion near the shoulder of the other edge, that is, a diagonal line, compared to the case where the number of the claw parts 43 is set to the same number The length along the line becomes relatively long. As a result, when the pressure is applied from the inside in the direction of pulling out, the way of applying the force in the direction of expanding the claw portion changes due to the swelling of the cylindrical portion 11b of the base portion 11, and the inclination is inclined as in this embodiment. This is because the one formed in such a manner is more difficult to deform.

  When compared with the case of being formed by cutting vertically as in the conventional case, the fitting force and the airtightness are enhanced if the edge is inclined even slightly. Therefore, the inclination angle of the end edge is not limited, and any angle greater than 0 degree and less than 90 degrees with respect to the horizontal plane is included in the present invention. However, the angle of inclination of the edge with respect to the horizontal plane is 30 degrees in consideration of the ease of molding without compromising the openability and having a high fitting force and airtightness as compared with those cut vertically. It is preferable to set it in a range of ˜70 degrees, and it is more preferable to set it in a range of 40 degrees to 60 degrees.

  Also in this embodiment, as shown in FIG. 4B, the maximum length c along the circumferential direction of each claw portion 43 of the lid member 40 and the maximum interval d of the gap between the edges are as described above. It is preferable to set the same as in the first embodiment. The fitting force can be further increased, and the airtightness can be further improved. The definitions of the maximum length c and the maximum interval d in this case are exactly the same as in the first embodiment, and when the lid member 40 is placed on a flat surface, the measurement is performed on a plane parallel to the flat surface. It is the length along each arc.

  Here, based on the test data of the present inventors, the effect of the lid member of the present invention will be further clarified.

The present inventors experimented on the following items, showed the results in a table, and compared the conventional lid member with the lid member of the present invention.
(1) Fitting force when the lid is closed (2) Pressing force when the lid is opened (3) Airtightness when the lid is closed (leak test)

  The fitting force test was performed by stacking two sheet packings of the same thickness and size on the back side of the lid member (with a cardboard packing on the side close to the back side of the lid member and a ball on the side away from the back side. Loaded with aluminum foil packing with aluminum foil laminated on the surface of the paper, the base part (nominal thickness of the plate: 0.30 mm, outer diameter: 48.9 mm, inner diameter: 46.5 mm, caliber: 40.0 mm and the height to the groove 5.8 mm), the center of the back side (sheet packing side) was pressed with a jig, and the force when the lid member was removed was measured. The average thickness when two sheet packings were laminated was 2.45 mm, and the diameter was 47.62 mm for cardboard packing and 48.88 mm for aluminum foil packing. Also, the protector (clamping tool for the lid member) is removed in order to measure the fitting force of only the lid member. In the airtightness test, as specified in JIS Z 1607: 2003, colored water is poured into a container with a cap attached thereto, the lid member is closed, and the lid member is directed downward and compressed air with a gauge pressure of 40 kPa. And let stand for 4 minutes, and then check for leakage of colored water from the lid member. In order to test the airtightness of only the lid member, the protector to be used in “8. Airtightness test” of JIS Z 1607: 2003 is removed and the airtightness test is executed.

  Moreover, the conditions of the cover member used for the test are as follows, 10 cover members were produced for each test example and each comparative example, and each was tested.

Test Example 1 (first embodiment)
Nominal thickness of plate: 0.36mm
Outer diameter: 50.5mm
Inner diameter: 47.2 mm
Height (height to shoulder): 7.70-7.84mm
Overall height (height to the top): 8.77 mm
Difference in height between top and shoulder (average value): 0.93 mm
Maximum length c of claw part c: 16.47 mm
Maximum length c in the circumferential direction of the claw part / total circumference: about 1 / 9.6
Number of nail portions: 9 Maximum gap d between nail edge edges / nail edge shape (from shoulder to bottom): vertical

Test example 2 (second embodiment)
Nominal thickness of plate: 0.36mm
Outer diameter: 50.5mm
Inner diameter: 47.2 mm
Height (height to shoulder): 7.94 to 8.04 mm
Overall height (height to the top): 9.08 mm
Difference in height between top and shoulder (average value): 1.04 mm
Maximum length c of claw part c: 16.70 mm
Maximum length c in the circumferential direction of the claw part / full circumference: about 1 / 9.5
Number of nail parts: 9 Maximum gap d between nail edge edges: 0.41 to 0.55 mm
Nail edge shape (from shoulder to lower end): Inclined (there is a round at the lower end)

Comparative Example 1 (Conventional product “Shiga Can Co., Ltd.”)
Nominal thickness of plate: 0.36mm
Outer diameter: 50.5mm
Inner diameter: 47.2 mm
Height (height up to shoulder): 7.83 to 7.90 mm
Overall height (height to the top): 8.89 mm
Difference in height between top and shoulder (average value): 0.99 mm
The maximum length c of the nail portion in the circumferential direction: 14.40 mm
Maximum length c in the circumferential direction of the claw part / total circumference: about 1/11
Number of nail portions: 10 Maximum gap d between nail edge edges: 1.27 to 1.43 mm
Nail edge shape (from shoulder to bottom): Vertical

  As is apparent from this table, when Test Examples 1 and 2 are compared with Comparative Example 1, the lid members of Test Examples 1 and 2 are all excellent in terms of fitting force and airtightness. Moreover, the pressing force at the time of opening the lid was not significantly different in both Test Examples 1 and 2 and Comparative Example 1, and the test example was never larger than the comparative example.

  In the test example 1 in which the length and gap of the claw portion in the circumferential direction are adjusted, the fitting force is about 1.5 times or more that of the comparative example 1, and the airtightness is about 1. It was 4 times, showing a very high effect. Further, in the test example 2 having the structure in which the edge of the claw portion is inclined and the length and gap of the claw portion in the circumferential direction are adjusted, the fitting force is larger than that of the comparative example 1. The value was about twice, and the airtightness was about 1.4 times, indicating a higher value.

Fig.1 (a) is a perspective view of the cover member of the packaging container based on the 1st Embodiment of this invention, FIG.1 (b) is a partial cross section front view of this cover member. FIG. 2 is a back view of the lid member of the packaging container according to the first embodiment. FIG. 3 is a perspective view showing the relationship among the lid member, the sheet packing, and the base member of the packaging container according to the first embodiment. FIG. 4A is a perspective view of the lid member of the packaging container according to the second embodiment of the present invention, and FIG. 4B is a partially sectional front view of the lid member, and FIG. ) Is a partial cross-sectional front view when the lid member is opened.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lid member 2 Shoulder part 3 Bottom part 4 Swelling part 4a Top part 5 Claw part 11 Base part 40 Lid member 41 Bottom part 42 Swelling part 42a Top part 43 Claw part 44 Shoulder part

Claims (16)

A skirt projecting in one direction from the peripheral shoulder, and a bulging portion formed so as to bulge in a direction opposite to the skirt from the shoulder to a substantially central portion; On the other hand, the lid member of the packaging container is deformed in a direction in which the hem part is separated from the base part by pressing the bulging part,
The skirt is formed with a plurality of claw portions in the circumferential direction, and the maximum length along the circumferential direction of each claw portion is 1/10 to 1 / 7.5 of the circumference. A packaging container, wherein a maximum gap between adjacent edges along the circumferential direction of each claw portion is set to 1 mm or less in a non-pressed state of the bulging portion. The lid member.   2. The lid of a packaging container according to claim 1, wherein the maximum length of each claw portion along the circumferential direction is formed in a range of 1/10 to 1 / 8.5 of the circumference. Element.   The maximum gap between adjacent edges along the circumferential direction of each claw portion is set to 1/20 or less of the length of the claw portion in a non-pressed state of the bulging portion. The lid member of the packaging container according to claim 1 or 2.   The maximum gap between adjacent edges along the circumferential direction of each claw is set to 1/20 to 1/50 of the length of the claw in the non-pressed state of the bulge. The lid member of the packaging container according to claim 3.   JIS Z 1607: A lid member that meets the standards for B-type 40 or B-type 50 defined in “Metal plate lids / caps”, and the number of claws is in the range of 8-9. The lid member for a packaging container according to any one of claims 1 to 4.   The packaging container lid member according to claim 5, wherein the number of the claw portions is nine.   A lid member satisfying the standard of B-type 70 defined in JIS Z 1607: 2003 “Metal plate lid / cap”, wherein the number of each claw portion is 11 pieces. The lid | cover member of the container for packaging of any one of -4. A skirt projecting in one direction from the peripheral shoulder, and a bulging portion formed so as to bulge in a direction opposite to the skirt from the shoulder to a substantially central portion; On the other hand, the lid member of the packaging container is deformed in a direction in which the hem part is separated from the base part by pressing the bulging part,
The skirt portion is formed with a plurality of claw portions in the circumferential direction, and at least a part from the shoulder portion to the lower end portion of each edge along the circumferential direction of each claw portion is inclined. A lid member for a packaging container.   The lid member for a packaging container according to claim 8, wherein a shoulder portion to a lower end portion of each edge along the circumferential direction of each claw portion is inclined in a certain direction.   The maximum length along the circumferential direction of each claw part is formed in the range of 1/10 to 1 / 7.5 of the circumference, and between the adjacent edges along the circumferential direction of each claw part 10. The lid member for a packaging container according to claim 8, wherein the maximum gap is set to 1 mm or less when the bulging portion is not pressed.   11. The lid of a packaging container according to claim 10, wherein the maximum length along the circumferential direction of each claw is formed in a range of 1/10 to 1 / 8.5 of the circumference. Element.   The maximum gap between adjacent edges along the circumferential direction of each claw portion is set to 1/20 or less of the length of the claw portion in a non-pressed state of the bulging portion. The lid member of the packaging container according to claim 10 or 11.   The maximum gap between adjacent edges along the circumferential direction of each claw is set to 1/20 to 1/50 of the length of the claw in the non-pressed state of the bulge. 13. The lid member for a packaging container according to claim 12,   JIS Z 1607: A lid member that meets the standards for B-type 40 or B-type 50 defined in “Metal plate lids / caps”, and the number of claws is in the range of 8-9. The lid member for a packaging container according to any one of claims 8 to 13.   15. The lid member for a packaging container according to claim 14, wherein the number of the claw portions is nine.   9. A lid member satisfying the standard of B-type 70 defined in JIS Z 1607: 2003 “Metal plate lid / cap”, wherein the number of each claw portion is 11 pieces. The lid member of the packaging container according to any one of ˜13.

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