JPH0755703B2 - Plastic container with metal lid - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a plastic container with a metal lid provided with a metal lid by winding, and more specifically, buckling at the time of winding processing. The present invention relates to a plastic container with a metal lid that is resistant to deformation and has excellent resistance to a decrease in internal pressure of the container during the cooling process after filling the contents or during the subsequent storage.

(Prior Art) Plastic containers have the advantage of being significantly lighter than glass containers and metal containers, and are now widely used in various fields.

As such a plastic container, for example, a plastic container with a metal lid, in which the body of the container is made of plastic and a metal lid is provided on the upper end of the body by winding, has been known for a long time (for example, Japanese Utility Model Publication No. 37- 25894). A so-called plastic bottle is well known as a typical example of a plastic container whose lid is not integrated with the container.

By the way, a plastic container has a problem that its strength is lower than that of a glass container or a metal container. Recently, in particular, in order to further reduce the weight of the container and reduce the raw material cost, the thickness of the container wall is reduced. Because it is as thin as possible,
As the wall thickness of the vessel wall becomes thinner, the strength naturally lowers, which makes it easier to deform with respect to external pressure, and the problem of reduced pressure deformation due to lower inner pressure of the container is more prominent.

In order to improve the strength of such plastic containers,
For example, in a plastic bottle or the like, means for providing beads, ribs, or the like on the wall surface of the container body is known (for example, see Japanese Utility Model Laid-Open No. 1-94218).

(Problems to be Solved by the Invention) However, although the means for providing the bead or rib on the wall surface of the body part improves the deformation resistance against pressing to some extent,
It is not possible to sufficiently improve the deformation resistance and the pressure reduction deformation resistance against the axial load of the container. In particular, in the above-mentioned plastic container with a metal lid, since a load is applied in the container axial direction when the metal lid is attached by winding processing after filling the container with contents, there is a problem that buckling deformation easily occurs at this time. However, the above method cannot effectively solve such a problem.

Therefore, an object of the present invention is to provide a plastic container with a metal lid, which is provided by winding a metal lid on the end of the body part, in which the plastic container has improved resistance to deformation against axial load of the container and deformation of container internal pressure. To provide a container.

(Means for Solving the Problems) According to the present invention, in a plastic container that includes a substantially cylindrical body, and a metal lid is provided on the upper end of the body by a winding process, the body is , A wall surface oriented by stretch blow molding of a thermoplastic resin, and at least a part of the body,
A circumferential polyhedron wall formed by arranging substantially polygonal constituent unit surfaces continuously in the axial direction and the circumferential direction of the container is formed in the body portion, and the boundary ridge line between the constituent unit surfaces adjacent to each other and the The intersection where the boundary ridges intersect with each other is convex to the outside of the container body relative to the constituent unit surface, and the container axial direction rows of adjacent constituent unit surfaces have a phase difference. The structural unit surface satisfies the following formula (1): 0.2 ≦ L / w ≦ 4 (1), where L is the maximum length in the container axial direction and w is the maximum width in the container circumferential direction. The distance between the midpoint of a straight line connecting the boundary lines indicating the maximum width in the container circumferential direction or the intersections of the boundary lines and the center of the container body in the plane cross section of the container including the straight line is s, and the end of the straight line Assuming that the distance between the portion and the center is r and r−s = d ₀ , the amount of depression d of the structural unit surface is Provided is a plastic container with a metal lid, which satisfies the following formula (2): 0.5 ≦ d / d ₀ ≦ 2 (2).

In the present invention, polyethylene terephthalate is preferably used as the thermoplastic resin.

(Operation) In the plastic container with a metal lid of the present invention, the body wall is formed by stretch blow molding and is molecularly oriented, and the body wall has a polygonal shape in which the central portion is recessed inside the container. The greatest feature is that a peripheral polyhedron wall is formed in which the constituent unit surfaces are continuously arranged in the container axial direction and the circumferential direction.

That is, the strength of the body wall itself is increased by molecular orientation,
Since the peripheral polyhedron wall in which the polygonal structural unit surfaces composed of such high-strength wall surfaces are continuously and tightly assembled is formed in the body part, the deformation resistance against the axial load of the container is improved. It is remarkably improved, and buckling deformation is effectively prevented even when a metal lid is provided by, for example, a winding process, and excellent deformation resistance is obtained even when the internal pressure of the container is reduced.
For example, even if the circumferential polyhedron wall as described above is formed in the container body, if the body wall surface is not molecularly oriented, it is possible to sufficiently improve the deformation resistance against the axial load of the container. I can't.

Furthermore, in order for the circumferential polyhedron wall to be properly incorporated in the container body, the boundary ridgeline between adjacent constituent unit surfaces and the crossing portion where the boundary ridgelines intersect each other are relatively large in comparison with the constituent unit surface. Convex to the outside of the body part, the container axial direction rows of the constituent unit surfaces adjacent to each other have a phase difference, and the shape of the constituent unit surface is defined by the formulas (1) and (2). )
If any of these is missing, it becomes difficult to form a circumferential polyhedron wall in which the structural unit surface is tightly incorporated in the body of the container. Even if the body wall is molecularly oriented, the deformation resistance against the axial load of the container and the deformation resistance against the reduction of the internal pressure of the container become unsatisfactory.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail based on specific examples shown in the accompanying drawings.

Manufacturing method: The plastic container with a metal lid of the present invention can be manufactured by various methods known per se as long as the container body portion having the circumferential polyhedral wall is formed by stretch blow molding of a thermoplastic resin.

For example, as shown in FIG. 1, a thermoplastic resin pipe is formed by injection molding, melt extrusion, or the like, the pipe is stretched uniaxially at a stretchable temperature (A), and then a cavity corresponding to a polyhedral wall is formed. The pipe is placed in a blow molding die having, and blow molding is performed by blowing a fluid such as air at a stretchable temperature to form a container body portion that is biaxially stretched and has a circumferential polyhedron formed ( B), then both ends are flanged (C), the contents are filled, and then a metal lid is wound around this flange portion to manufacture. In this case, a pipe having openings at both ends is used, but it is also possible to use a pipe having one end closed. In this case, by blow molding, a container in which the body and the bottom are integrated is obtained.

Further, as shown in FIG. 2, a cup is manufactured by injection molding, and the cup is subjected to ironing to obtain a uniaxially stretched molded body (A), and the upper end portion is cut (B), and then, Similar to the above, blow molding is performed at a stretchable temperature to obtain a molded product having a body part stretched in the circumferential direction (C), the upper end thereof is flanged (D), and the flange part is filled with the contents and then It is manufactured by winding a metal lid.

The plastic container manufactured by such a method,
By blow molding, the body wall is molecularly oriented to increase its strength, and moreover, since the peripheral polyhedral wall in which the structural unit surfaces having high-strength wall surfaces are tightly incorporated is formed in the body part, It has good deformation resistance against an axial load, and buckling is effectively prevented, for example, when winding a metal lid. Further, not only the pressure reduction deformation resistance against the decrease of the internal pressure of the container but also the deformation resistance against the pressure from the outside is excellent.

Container resin In the present invention, as the thermoplastic resin used for molding the above-mentioned container, various thermoplastic resins used as a material for forming containers, for example, various polyester resins, polypropylene resins, polycarbonate, styrene resins, nylon resins A resin or the like can be used, but among them, polyester, particularly polyethylene terephthalate is preferably used.

Metal lids As the metal lids, for example, tin-plated steel sheets, tin-free steel (various surface-treated steel sheets such as electrolytic chromic acid treated steel sheets, and light metals such as aluminum, are used. Those provided with a protective coating film such as paints, epoxy-acrylic paints, epoxy-vinyl paints, vinyl-phenol paints are used.

A circumferential groove portion for engaging with a winding flange provided on the container body is provided on the peripheral portion of the metal lid, and a sealing rubber composition is lined in the circumferential groove. Is preferred. Further, the center panel portion of the metal lid may be provided with an easily openable mechanism known per se.

Circular polyhedron wall In the present invention, the circumferential polyhedron wall formed in the container body is configured such that constituent unit surfaces are continuously continuous in the container axial direction and the container circumferential direction. Is substantially polygonal in plan view.

The case where the constituent unit surface is a quadrangle, particularly a rhombus will be described as an example.

That is, FIG. 4 shows a side view of a plastic container having a polyhedral wall composed of rhombus-shaped constituent unit surfaces in its body,
A half-side sectional view of the container of FIG. 4 is shown in FIG. 5, and a plan view of the container of FIG. 4 is shown in FIG. Further, FIG. 7 (a) shows an enlarged plan view of the structural unit surface, and FIG. 7 (b) shows an enlarged side cross section of the wall surface on the structural unit surface.

As is clear from FIG. 4, in particular, on the substantially entire surface of the body of the container, a peripheral polyhedron wall in which constituent unit surfaces of rhombus abcd are continuously connected in the axial direction and the circumferential direction of the container is formed. . In such a constitutional unit surface, each side ab, bc, cd, and da of the rhombus abcd is a boundary ridgeline with an adjacent constitutional unit surface, and each vertex is an intersection of the boundary ridgelines.

In the present invention, as is clear from FIGS. 5 and 7 (b), in particular, the boundary ridge lines and the intersecting portions in the rhombus-shaped constituent unit surface abcd are relatively relative to the constituent unit surface. It is convex outward. In other words, it is understood that the central portion of the structural unit surface has a concave shape inside the container. That is, in the container of the present invention, a structure in which high-strength unevenness is alternately repeated in both the axial direction and the circumferential direction of the container by a continuous row of stretched and molecularly oriented high-strength constituent unit surfaces. It has excellent deformation resistance against load in any direction because it has, for example, excellent deformation resistance against axial load in the container and against depressurization inside the container, and also from the outside. It also exhibits excellent deformation resistance against the pressure of.

Further, the structural unit surface abcd forms a continuous row in both the axial direction and the circumferential direction of the container, but has a phase difference of 1/2 in the axial row of the adjacent structural unit surfaces. . Because of having such a phase difference, it becomes a structure in which the respective constituent unit surfaces are alternately and firmly incorporated, and various types of deformation resistance are improved.

Furthermore, in the above-described aspect, the boundary ridge lines ab, bc, cd, and da of the constituent unit surface are all inclined with respect to the container axis line, and each boundary ridge line extends in a bent manner. This is considered to be one of the reasons why the container exhibits excellent deformation resistance.

FIG. 3 shows the external pressure resistance of an empty container provided with a circumferential polyhedral wall composed of rhombus-shaped constituent unit surfaces on the body for each number n of constituent unit surfaces forming the circumferential row of the same phase. The curve which plotted the ratio (with a peripheral polyhedron / without a peripheral polyhedron; hereafter simply called an empty container external pressure strength ratio) with the external pressure strength of the empty container which is not provided with a peripheral polyhedral wall is shown. From this FIG. 3, n
It is understood that when the value is too large, the effect of improving the external pressure resistance strength tends to be weak. Further, even if the number n of the constituent unit surfaces is excessively small, the effect of improving the external pressure strength of the polyhedron wall is lost, and the bending of the wall surface of the body becomes extreme, resulting in a problem that the appearance of the container is impaired. .
Therefore, in such a mode, the number of constituent unit surfaces that form the circumferential row of the same phase is preferably 3 or more, particularly 3 to 14, and most preferably 4 to 12.

Furthermore, the above-mentioned circumferential polyhedron wall does not necessarily have to be provided on the entire surface of the body portion, and may be provided on a part of the body portion as long as the desired deformation resistance to various pressures is not impaired. For example, as shown in FIG. 8, the peripheral polyhedron wall may be provided only in the central portion of the body portion. In this case, it is sufficient that the peripheral polyhedron wall occupies a relatively small proportion in the air body portion. Deformation resistance is exhibited and the appearance characteristics are also good.

Further, referring to FIG. 7 (a) showing an enlarged plan view of the structural unit surface, the axial length L of the structural unit surface in the container axial direction (corresponding to the distance between the vertices a and c) and the circumferential width w ( It is important that (corresponding to the distance between the vertices b and d) satisfies the formula (1): 0.2 ≦ L / w ≦ 4 (1). FIG. 9 shows L / L for an empty container in which the number n of the constituent unit surfaces constituting the circumferential row of the same phase has a circumferential polyhedral wall (the constituent unit surface is a rhombus).
It is the diagram which plotted the relationship between the value of w, and the external container strength pressure ratio. As shown in FIG. 9, when L / w is larger than 4, the effect of improving the external pressure resistance strength becomes unsatisfactory. When L / W is less than 2, not only the effect of improving the external pressure resistance strength is insufficient, but also the deformation resistance against an axial load becomes unsatisfactory and the appearance characteristics of the container are impaired.

Further, in the present invention, it is important to set the amount of depression d (corresponding to the depth of the central portion) of the constituent unit surface within a certain range in order to develop satisfactory deformation resistance and the like. That is, the recess amount d corresponds to the recess from the outer peripheral surface of the body when the polyhedron wall is not formed. For example, referring to FIG. 6, assuming that the distance between any vertex (the intersection of the boundary ridgelines) of the constituent unit surface abcd and the container body center O is r, each vertex a to d is all. Although there are some errors in molding, they are located on a circle on the radius r of the center O. That is, the circle having the radius r corresponds to the outer peripheral surface of the body when the polyhedral wall is not formed. Here, a midpoint of a straight line bd (the length of which corresponds to the maximum width w in the circumferential direction of the container) connecting the vertices b and d located in the same plane, and a container body located in a plane including the midpoint In the present invention, when the distance from the center O is s and r−s = d ₀ , the amount of depression d
Must satisfy the following formula (2): 0.5 ≦ d / d ₀ ≦ 2 (2). This equation will be briefly described. When d / d ₀ is smaller than 1, as shown in FIG. 7 (b), the most concave central portion of the structural unit surface abcd is located outside the straight line bd in the container. Means located. Further, when d / d ₀ is larger than 1, it means that the most recessed central portion is located inside the container with respect to the straight line bd.

FIG. 10 shows the value of d / d ₀ and the external pressure of the empty container for an empty container having a circumferential polyhedral wall in which the number n of the constituent unit surfaces constituting the circumferential row of the same phase is 8 (the constituent unit surface is a rhombus). It is the diagram which plotted the relationship with intensity ratio. According to this FIG. 10, d / d ₀
It is understood that when is less than 0.5, the external pressure resistance strength is significantly reduced. That is, even if a polyhedral wall satisfying the various conditions described above is formed, d / d ₀ is 0.5.
If it is smaller than the above range, satisfactory external pressure resistance cannot be obtained. On the other hand, when d / d ₀ is greater than 2, even if the external pressure strength can be satisfied, the deformation resistance to the axial load of the container becomes unsatisfactory, buckling easily occurs, and the appearance characteristics of the container Also decreases.

Further, the above-described amount of depression d is closely related to the number n of constituent unit surfaces in the circumferential row that is in phase with the maximum width w of the above-described constituent unit surface. For example, since d ₀ = r−s, s = r · cos (π / n) and w = 2r · sin (π / n) in the above-mentioned diamond-shaped structural unit surface, d ₀ is represented by the following formula ( It is represented by 3).

d ₀ = 1/2 ・ w [sin (π / n)] ^-1・ [1-cos (π / n)]
(3) Since d ₀ is determined by w and n in this manner, therefore, the range of the recess amount d that can be taken increases as w increases, and the range that can be taken decreases as n increases.

In the case of the above-mentioned rhombus-shaped constitutional unit surface, a complete fold line is formed along the straight line showing the maximum width w, and the constitutional unit surface is divided into two isosceles triangles. You can also An enlarged plan view and a side sectional view (axial direction sectional view) of the structural unit surface in this case are shown in FIGS. 11A and 11B, and a partial side view and a half sectional view of the container are shown in FIG. Shown in Figure and Figure 12-B. That is, in this aspect, the axial section of the structural unit surface ABCD is V-shaped (see FIG. 11 (B)), and the structural unit surface ABCD is
The CD is divided into two isosceles triangles ABCD and DB that share the side BC (see FIG. 11 (A)). Further 12-A
As shown in FIG. 12 and FIG. 12-B, in such a constitutional unit surface, each vertex (shown by 2) is located at the outermost protruding position, and a side BC (shown by 3) common to two isosceles triangles. ) Is the most recessed position, and the other sides (4
Is shown in the middle position between the two. Therefore, the polyhedral wall formed in this manner has a shape in which the side 3 is a valley and the side 4 is a ridge.

It goes without saying that even in such an embodiment, the above-mentioned formulas (1) and (2) must be satisfied. In this case, assuming that the height of the isosceles triangle is h, the maximum length L in the axial direction is represented by 2h. Therefore, the condition of the above formula (1) is represented by 0.2≤2h / w≤4.

Further, in such an aspect, within a range satisfying the above-mentioned expression (2), for example, as shown in FIG. 13, the constituent unit surfaces of a part of the axial rows are deep along the axial center line. It can be recessed (d can be increased).
In this case, from the equation (2), d can be set to 2d _{0 at} maximum. According to the embodiment of FIG. 13 as described above, the mechanical strength of the body is further improved, and the external pressure deformation resistance, the pressure reduction deformation resistance and the like are further improved. For example, even during retort sterilization and after that. It also has excellent resistance to shrinkage due to cooling.

Although the case where the shape of the structural unit surface is a rhombus shape, which is a typical example of a quadrangle, has been described above, the present invention is not limited to this, and other polygons can be used.

For example, FIG. 14 and FIG. 15 show an example in which the peripheral unit polyhedral wall is formed in the barrel portion with the constitutional unit surface being hexagonal. These aspects are practically the same as the example of FIG. 4 except that the constitutional unit surfaces are hexagonal. For example, the axial rows of the adjacent constitutional unit surfaces have a phase difference of 1/2. And the point that the structural unit surface is formed so as to satisfy the above-described formulas (1) and (2). However, since the shape is a hexagon, for example, the maximum axial length L or the maximum circumferential width w is indicated not by the distance between vertices but by the distance between boundary ridges depending on the orientation of the hexagon. Become.

Further, in the case where the constitutional unit surface has a hexagonal shape, the number n of constitutional unit surfaces forming the circumferential row in the same phase is generally 3
However, it is preferably in the range of 3 to 10.

Further, in the present invention, as shown in FIGS. 16 to 18,
The boundary ridgeline 30 of each structural unit surface 20 and the apex 32 where the boundary ridgelines 30 intersect with each other may not be formed into an acute corner, but may be formed with a gentle roundness having a constant radius of curvature R. In this case, the radius of curvature R preferably satisfies the following equation: t ≦ R ≦ (2/3) r, where t is the body thickness and r is the body radius. Of course, the boundary ridgeline 30 may have a constant curvature radius R, or may have a plurality of curvature radii.

(Example) Example 1 Polyethylene terephthalate (PET) having an intrinsic viscosity of 0.95 was used, and melt extrusion pipe molding was performed while uniaxially stretching in the extrusion direction with a draw cone to obtain an inner diameter of 39.5 mm, a thickness of 0.4 mm and a length of 150 mm. A pipe with open ends was molded.

Then, the portion of the pipe excluding 10 mm at each end is heated to about 105 ° C. by infrared rays, and both ends of the pipe can be grasped and have a cavity corresponding to a diamond-shaped structural unit surface shown in FIGS. 4 to 7. Blow molding A split mold is used, blown with compressed air (25 kg / cm ² ) from one end of the above pipe to perform blow molding, and the outer diameter with the peripheral polyhedral wall is 50 mm.
A hollow tube with both ends open was molded.

Furthermore, both ends 10 mm of this hollow tube were rapidly heated to 100 ° C. with infrared rays, flanges were formed at both ends using a flange die, and a metal lid was double-wound on each flange. A plastic empty container made of PET and having a circumferential polyhedral wall was molded. The peripheral polyhedron wall is formed in the central part of the body with a length of 80 mm over the entire circumference, and the number of constituent unit surfaces in the circumferential direction of the same phase is eight, and
L / w = 0.96, was the d / d ₀ = 0.95.

When an external pressure was applied to this empty container to measure the external pressure resistance strength of the body, it was 0.95 kg / cm ² .

The external pressure resistance strength was measured as follows.

A plastic empty container with a metal lid double wound and sealed,
Put the whole in a transparent acrylic nitrile / styrene resin pressure vessel, gradually apply pressure from outside with compressed air, and observe the empty plastic vessel while deforming the body and suddenly changing the pressure. The pressure value immediately before was measured and used as the external pressure resistance strength.

Comparative Example 1 An ordinary empty container having a circumferential shape in which the circumferential polyhedron wall was not formed was formed in the same manner as in Example 1 by using an ordinary blow molding split mold.

The external pressure resistance of this container was 0.3 kg / cm ² .

(Effect of the Invention) In the present invention, the body of a plastic container provided with a metal lid by winding is molecularly oriented by stretch blow molding to have high strength, and a polygonal structural unit surface is provided on the body. By forming the circumferential polyhedron wall by continuously forming rows in the direction and the circumferential direction, it becomes possible to significantly improve the deformation resistance against pressure from any direction. In particular, since it has excellent resistance to axial load deformation, it is possible to effectively prevent buckling, for example, during the winding process of metal lids, and further, it is resistant to pressure reduction deformation against the decrease in container internal pressure and pressure from outside. The resistance to external pressure deformation is also good.

Further, since the peripheral polyhedron wall is formed in the body, the container has good appearance characteristics, high commercial value, and is easy to hold.

[Brief description of drawings]

1 and 2 are views showing an example of a manufacturing process of the plastic container with a metal lid of the present invention. FIG. 3 shows that the plastic container with a metal lid (empty container) of the present invention is not provided with the circumferential polyhedron wall for the external pressure resistance for every number n of the constituent unit surfaces that constitute the circumferential row of the same phase. The curve which plotted the ratio with the external pressure strength of an empty container is shown. FIG. 4 is a side view of the plastic container with the metal lid of the present invention in which the shape of the structural unit surface is a rhombus. FIG. 5 is a half side sectional view of the container of FIG. FIG. 6 is a plan view of the container of FIG. 7 (a) is an enlarged plan view of the structural unit surface in the container of FIG. 4, and FIG. 7 (b) is an enlarged view showing a side cross section of the wall surface on the structural unit surface. FIG. 8 is a view showing an example of the plastic container of the present invention in which the circumferential polyhedron wall having the constituent unit surfaces of FIG. 7 is provided only in the central portion of the body portion. FIG. 9 shows the value of L / w and the external pressure strength of an empty container for an empty container having a circumferential polyhedral wall in which the number n of constituent unit surfaces constituting the circumferential row of the same phase is 8 (the constituent unit surface is a rhombus). It is the diagram which plotted the relationship with a ratio. FIG. 10 shows the value of d / d ₀ and the external pressure of the empty container for an empty container having a circumferential polyhedral wall in which the number n of the constituent unit surfaces constituting the circumferential row of the same phase is 8 (the constituent unit surface is a rhombus). It is the diagram which plotted the relationship with intensity ratio. 11 (A) and 11 (B) are plan enlarged views and side sectional views (axial direction sectional views) showing another example of a rhombus-shaped constituent unit surface.
Is. FIGS. 12-A and 12-B are a partial side view and a half sectional view of the plastic container of the present invention having the constituent unit surface of FIG. FIG. 13 is a view showing another example of the plastic container of the present invention having the constituent unit surface shown in FIG. FIG. 14 and FIG. 15 are views each showing an example of the plastic container of the present invention in which the constitutional unit surface has a hexagonal shape and the circumferential polyhedral wall is formed in the body portion. FIG. 16 to FIG. 18 are views showing examples of the plastic container of the present invention in which the boundary ridgelines of the respective constituent unit surfaces and the vertices 32 at which the boundary ridgelines intersect each other are formed by gently rounding.

Claims (8)

[Claims] 1. A plastic container comprising a substantially cylindrical body, and a metal lid provided on the upper end of the body by a winding process, wherein the body is oriented by stretch blow molding of a thermoplastic resin. The wall surface, and at least a part of the body,
A circumferential polyhedron wall formed by arranging substantially polygonal constituent unit surfaces continuously in the axial direction and the circumferential direction of the container is formed in the body portion, and the boundary ridge line between the constituent unit surfaces adjacent to each other and the The intersection where the boundary ridges intersect with each other is convex to the outside of the container body relative to the constituent unit surface, and the container axial direction rows of adjacent constituent unit surfaces have a phase difference. When the maximum length in the container axial direction is L and the maximum width in the container circumferential direction is w, the structural unit surface satisfies the relationship of 0.2 ≦ L / w ≦ 4. Is defined as s, and the distance between the midpoint of a straight line connecting the boundary lines or the intersections of the boundary lines and the center of the container body in the cross section of the container including the straight line is s, and the distance between the end of the straight line and the center is r. Assuming that r−s = d ₀ , the amount of depression d of the constituent unit surface satisfies the condition of 0.5 ≦ d / d ₀ ≦ 2. A plastic container with a metal lid that can be added. 2. The plastic container with a metal lid according to claim 1, wherein the thermoplastic resin forming the body is polyethylene terephthalate. 3. The metal lid according to claim 1, wherein the container circumferential direction row of the structural unit surfaces, which are structural unit surfaces that are in the same phase with respect to the axial direction of the container, is formed of 3 to 14 structural unit surfaces. Attached plastic container. 4. The structural unit surface has a quadrangular shape, and the structural unit surface is arranged so that all of the boundary ridgelines that are the sides of the quadrangle are inclined with respect to the container axial direction line, and the boundary The plastic container with a metal lid according to claim 1, wherein the ridge is recessed inside the container. 5. The constitutional unit surface has a quadrangular shape divided into two isosceles triangles, and has a shape which is bent into a substantially V shape when viewed in a cross section in the axial direction of the container and is recessed toward the inside of the container. The plastic container with a metal lid according to claim 1, which has. 6. The constitutional unit surface has a hexagonal shape.
The plastic container with a metal lid according to. 7. The plastic container with a metal lid according to claim 1, wherein the wall surface of the body portion on which the boundary ridge is formed is a smooth surface having a radius of curvature R. 8. The metal according to claim 7, wherein the radius of curvature R satisfies the following equation: t ≦ R ≦ (2/3) r, where t is the wall thickness and r is the body radius. Plastic container with lid.