JP6052600B2 - Ampoule container made of synthetic resin - Google Patents

Description

  The present invention relates to an ampoule container made of a synthetic resin that stores medicines, nutrients, and the like.

  As an ampoule container for storing medicines, nutrients, etc., for example, as shown in Patent Document 1, a shoulder portion having a diameter reduced upward is continuously connected to the upper end of a bottomed cylindrical barrel portion, and the shoulder portion has A resin ampule container in which a neck portion having a small inner diameter in a top tube shape is erected, a cut portion is formed at a boundary portion between the neck portion and a shoulder portion, and a combined portion of the trunk portion and the shoulder portion is biaxially stretch blow-molded. Are known. This ampoule container is opened at the weakened part formed by the cut part by relatively changing the body part side and the neck part side, but the shape and dimensions of the cut part are selected in advance By setting, the weakened portion formed by the cut portion is easily broken, and the content liquid is prevented from being scattered due to the impact at the time of opening.

JP 2000-037442 A

  However, in the prior art described in Patent Document 1, since the thickness of the weakened portion formed by the notch portion is large, a strong operating force is required for breaking off the neck side, thereby opening the ampoule container. There has been a problem that the stored content liquid may scatter due to the impact of the operation.

  Therefore, in this type of synthetic resin ampule container, in order to make it easier to fold the neck side, the thickness value of the weakened portion should be as small as possible, but the thickness value of the weakened portion should be reduced. There is a problem that the more moldability of the preform, which is an injection-molded product formed into an ampoule container by biaxial stretch blow molding, worsens as the amount increases.

That is, in the manufacture of the above-mentioned synthetic resin ampoule container, a preform formed into a bottomed cylindrical shape by injection molding generally has a molded molten resin material introduced into the mold from a portion corresponding to the body side of the ampoule container . injected into, but through the weakened portion of the narrowing is being molded by filling the neck side, if you set rather small the thickness of the weakened portion, the passage of the molding molten resin material in the weakened portion of the mold As a result, the moldability deteriorates such as “short shot” and “occurrence of shrinkage due to insufficient pressure” on the neck side.

  Therefore, a preform that is biaxially stretched into an ampoule container is injection-molded with PET (polyethylene terephthalate) or PP (polypropylene), and the thickness value at the smallest possible weakness within a range that does not deteriorate the moldability is obtained. As a result, a value of 0.35 to 0.55 mm could be obtained. That is, by setting the thickness value of the weakened portion to 0.35 mm or more, it is possible to reliably prevent the deterioration of formability, and by setting the thickness value of the weakened portion to 0.55 mm or less, The “folding” property of the side can be obtained.

  Based on this test result, a prototype (refer to FIG. 5, where FIG. 5 is an enlarged cross-sectional view of the portion where the weakened portion 7 is located) having a thickness value of the weakened portion of 0.4 mm is manufactured, and an ampule In the state where the belly of the thumb of the hand grasping the body part 2 of the container (see FIG. 1) is in contact with the support part d of the lower end part of the head part 6 corresponding to the neck part, the upper end part of the head part 6 A load as a pulling force was applied to the load acting part c, and a “breaking” test of the head 6 was performed. As a result, as shown in a characteristic curve C (shown by a one-dot chain line) in FIG. 4, even when the weakened portion 7 progresses, a relatively large elongation deformation occurs in the weakened portion 7 on the side to be finally broken. For this reason, it takes time to completely “break” the head 6, and there arises a complaint that the ease of “breaking” is impaired.

The present invention has been made to solve the problems in the prior art described above, in the synthetic resin ampule container body portion side Ru biaxially stretch blow molding, retaining good moldability head side In this state, it is a technical problem to ensure that the ease of “breaking” at the weakened part is not impaired, and thus it is intended to obtain a safe and good opening operation of the ampule container made of synthetic resin. is there.

The main structure of the means of the present invention for solving the above problems is as follows.
A main body part that is biaxially stretched and blow-molded into a bottomed cylindrical shape from an injection-molded preform and contains the content liquid; And forming a V-shaped circumferential groove on the outer periphery of the boundary portion of the head, and having a weakened portion that is broken by a relative variation of the main body and the head,
The thickness of the weakened portion is set to the smallest possible value within the thickness range that can function as an injection passage that exhibits good moldability during injection molding of the preform.
In the inner peripheral surface portion located in the vicinity of the weakened portion, providing a stepped portion made of a tapered stepped surface having an enlarged diameter upward,
It is in.

The thickness of the weakened portion located in the boundary portion of the main body portion and the head, "with a thickness range that can function as an injection passage which exhibits good moldability, and is set to a small value as possible" Monodea Ri and the shape of the vicinity of the weakened portion, the inner peripheral surface portion located on the inner circle, der those stepped portion formed of a tapered surface shape that is expanded upward is circumferentially provided Runode, synthetic resin ampule molded There is no inconvenience that a defectively molded portion is generated in the container, particularly a defectively molded portion on the head side.

  In addition, since the step portion is provided on the inner peripheral surface portion located near the weakened portion, stress is easily concentrated on the inner peripheral surface portion where the step portion is located during the cutting operation of the head, thereby the step portion. Becomes a part of the starting point, and the breakage of the weakened portion proceeds rapidly. In particular, in the final stage of the folding of the head, the stepped portion exhibits an action similar to the notch effect, so that the weakened portion is quickly broken without extending.

Another configuration of the present invention, the step portion of the main constituent as described above, from a position opposite to the weakened portion was positioned on laterally by approximately the thickness portion of the weakened portion is intended.

The step portion, from the position opposed to weakening, in the that is positioned above side by approximately the thickness portion of the weakened portion, the step portion itself forms a substantially equivalent thinner portion and the weakened portion Therefore, the range of the portion that is easily broken is expanded accordingly.

  Another configuration of the present invention is such that the stepped portion of the main configuration described above is positioned facing the weakened portion.

  In the case where the stepped portion is positioned so as to face the weakened portion, the stress at the time of “cutting” is concentrated at a position located at the same height.

  Further, another configuration of the present invention is the above-described main configuration, in which the preform is molded with either polyethylene terephthalate or polypropylene, and the thickness of the weakened portion is 0.35 to 0.55 mm. is there.

  When the preform was molded with either polyethylene terephthalate or polypropylene and the thickness of the weakened part was 0.35 to 0.55 mm, the state where the head side moldability was not deteriorated was maintained. The brittleness of the molded resin material in the weakened portion is enhanced by the concentration of stress due to the formation of the stepped portion.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the main structure of the ampoule container in the present invention, there is no inconvenience that the molded resin ampoule container has a defective molded portion, particularly a defective molded portion on the head side, and a good product can be manufactured stably.

  Further, since the step portion is provided in the inner peripheral surface portion located near the weakened portion, the stepped portion also becomes a part of the starting point with respect to the breaking operation of the weakened portion, and the breakage of the weakened portion proceeds rapidly. Therefore, the breakage on the inner peripheral surface side of the weakened portion also proceeds promptly, whereby a safe and good opening operation of the ampule container made of synthetic resin can be obtained.

The step portion, from the position opposed to weakening, in the that is positioned above side by approximately the thickness portion of the weakened portion, the step portion itself forms a substantially equivalent thinner portion and the weakened portion As a result, the range of the portion that is likely to break is expanded by that amount, whereby the stress is naturally concentrated at the portion that is likely to break, and a quick and good “breaking” process can be obtained.

  In the case where the stepped portion is positioned facing the weakened portion, the stress at the time of `` cutting '' will be concentrated at the same height position, so the opening shape of the ampule container made of synthetic resin It can always be constant.

  When the preform was molded with either polyethylene terephthalate or polypropylene and the thickness of the weakened part was 0.35 to 0.55 mm, the state where the head side moldability was not deteriorated was maintained. As a result, the brittleness of the molded resin material in the weakened part is increased due to the concentration of stress due to the formation of the stepped part, so that good moldability can be maintained and "extension deformation" of the molded resin material can be suppressed as much as possible A better “breaking” operation can be obtained.

It is a whole longitudinal cross-sectional view which shows the embodiment of this invention. In FIG. 1, it is the principal part longitudinal cross-sectional enlarged view of the 1st Example of the square mark part. In FIG. 1, it is the principal part longitudinal cross-sectional enlarged view of the 2nd Example of the square mark part. It is a characteristic diagram which shows the relationship between the load and distortion which act on a weakening part. It is a principal part vertical expansion figure for demonstrating the outline | summary of a prior art.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS.
In this embodiment, the side on which the head 6 is located with respect to the main body 1 is defined as the upper side, and the opposite side (lower side in FIG. 1) is defined as the lower side.

The ampule container made of a synthetic resin is formed by biaxially stretching blow-molded into a bottomed cylindrical shape from an injection-molded preform P (see the one-dot chain line in FIG. 1), and a main body 1 (see FIG. 1) containing the liquid N A cylindrical head portion 6 (see FIG. 1) that is integrally connected in an upright posture at the upper end of the main body 1 and a peripheral groove is formed on the outer periphery of the boundary between the main body 1 and the head 6. And a weakened portion 7 that is broken by relative fluctuations such as bending of the main body 1 and the head 6 , and an inner peripheral surface portion 8 near the weakened portion 7 has a stepped portion 9 that is expanded in diameter upward. Is formed.

  The embodiment example of the ampule container made of synthetic resin shown in FIG. 1 is made of PET, and the dimensions of the main parts are 124 mm in total height, 82 mm in height of the body 2, 23 mm in outer diameter of the body 2, and weakened The outer diameter of the part 7 is 7 mm, and the thickness a of the weakened part 7 is 0.4 mm.

The main body 1 includes a cylindrical body 2 with a bottom, a shoulder 3 (see FIG. 1) bulging upward in a spherical arc shape at the upper end of the body 2, and an upper end of the shoulder 3. A lip portion 5 having an outer rim structure is provided through a neck portion 4 having a small outer diameter . The head 6 is connected to the mouthpiece 5 via a weakened portion 7 which is formed thin by providing a V-shaped circumferential groove on the outside. The lower part of the main body part 1 below the mouthpiece part 5 is a part subjected to biaxial stretch blow molding, whereas the mouthpiece part 5 is a part which is not subjected to biaxial stretch blow molding and has a thickness. . Since the mustache portion 5 is thick, the weakened portion 7 formed by forming a V-shaped circumferential groove with the thick head 6 described later has the mustache portion 5 and the head 6. most variations will be supported without, will thereby be satisfactorily broken stably by.

The head portion 6 (see FIG. 1) is a portion that is not biaxially stretch blow-molded like the mouthpiece portion 5, and has been formed relatively thick from the beginning, and in particular, the lower portion has a shape that bulges outward. Molded to thickness. The upper end portion of the head 6 is in an open state at the stage of the preform P, but after the content liquid N is injected and stored in the main body 1 after the biaxial stretch blow molding of the main body 1, By pressing a heated mold against the upper end opening, the resin in the opened upper end opening is melted and softened, and is formed into a spherical arc shape and closed as shown in FIG.

  A stepped portion 9 (see FIGS. 2 and 3) provided around the inner peripheral surface portion 8 near the weakened portion 7 has a structure in which the diameter is increased upward, and has a tapered surface shape that is slightly inclined upward. It has a stepped surface shape. Since the step portion 9 forms a stress concentration portion at the inner peripheral surface side during the breaking operation of the weakened portion 7, the step portion 9 exhibits an action similar to the notch effect. Therefore, at the final stage of the “folding” operation of the head 6, the breakage at the inner peripheral surface side portion of the weakened portion 7 that has not yet been broken is promptly generated. Thereby, it is possible to obtain a good “folding” operation of the head 6 with almost no expansion deformation of the weakened portion 7.

FIG. 2 shows the structure of the step portion 9 according to the first embodiment. The step portion 9 is located at a position corresponding to the weakened portion 7 from the position a facing the weakened portion 7 (a ± 0. 1mm) is located in the upper side only. That is, since the thickness a is set to 0.4 mm, the stepped portion 9, from a position opposite to the weakened portion 7, will be located in the upper side only (0.4 ± 0.1) mm. The change indicated by (± 0.1 mm) of the position of the step portion 9 in the first embodiment is set according to the step value b of the step portion 9 and the inclination angle of the step portion 9 (taper surface). However, the main point is as close as possible to this value (0.4 mm) as long as the thickness at the portion where the stepped portion 9 is provided does not fall below the thickness a (0.4 mm) at the weakened portion 7. It is in.

  FIG. 3 shows the structure of the second embodiment of the step portion 9, and the step portion 9 is located facing the weakened portion 7. In the second embodiment example of the step portion 9, the step portion 9 reduces the inner diameter of the inner peripheral surface portion 8 on the lower side of the step portion 9, contrary to the case of the first embodiment example. Since the wall thickness immediately below the weakened portion 7 is increased, when the weakened portion 7 starts to break, the increase in the wall thickness may tend to slightly increase the resistance to breakage.

  Next, FIG. 4 shows an analysis test result example of the breaking characteristics of the weakened portion 7 in the first and second embodiment examples of the stepped portion 9. The analysis test example shown in FIG. 4 is the same as that shown in FIG. 1 in the state where the belly of the thumb of one hand holding the torso 2 is in contact with the support portion d at the lower end of the head 6. The relationship between the load and the strain (elongation) in the weakened portion 7 is shown under the condition in which a pushing force is applied to the load acting portion c on the opposite side of the support portion d at the upper end portion.

  In FIG. 4, a characteristic curve A indicated by a solid line indicates the test result of the first embodiment example of the step portion 9, and a characteristic curve B indicated by a broken line indicates the second embodiment of the step portion 9. Example test results are shown. As is clear from the comparison with the characteristic curve C in which the stepped portion 9 is not provided, in the case of the first embodiment of the stepped portion 9, the weakened portion 7 has a wide range where it can be easily broken. In this case, in the case of the second embodiment of the stepped portion 9, the wall thickness immediately below the weakened portion 7 is increased. Under the influence, there is a tendency that the load required to start fracture is slightly increased.

  Further, in the final stage of the breakage of the weakened portion 7, stress is concentrated on the inner peripheral surface side by the step portion 9 in both the first embodiment example of the step portion 9 and the second embodiment example of the step portion 9. Since a portion is formed, an undesirable elongation deformation as shown in the characteristic curve C does not occur, and the fracture occurs completely at a distortion rate of less than 190%.

As described above, the configuration of the present invention and the operation and effects thereof have been described along the exemplary embodiments.However, the exemplary embodiments of the present invention are not limited to the exemplary embodiments described above. not a flat tapered surface shape may be a tapered surface shape consisting Tamakomen curved in shape bulging upward, also as a molding material of the ampoule container, it is also possible to use PP soft, yet It is also possible to make the body part 2 not cylindrical but non-cylindrical without rolling.

  The ampule container made of the synthetic resin of the present invention can be easily opened in a state in which the occurrence of defective molding of the head is surely prevented, and can be applied in a wide field as an ampule container. can do.

DESCRIPTION OF SYMBOLS 1; Main body part 2; Trunk part 3; Shoulder part 4; Neck part 5; Mouth part 6; Head part 7; Weakening part 8; Inner peripheral surface part 9: Step part a: Thickness b of weakening part; Load acting part d; support part P; preform N; content liquid A; characteristic curve B; characteristic curve C;

Claims (4)

The injection molded preform (P) is biaxially stretched blow-molded into a bottomed cylinder and is erected on the upper end of the main body (1) and the main body (1) containing the content liquid (N). A head-shaped cylindrical head (6) and a V-shaped circumferential groove formed on the outer periphery of the boundary between the main body (1) and the head (6), and the main body (1) A weakened portion (7) that is broken by relative fluctuations of the head (6), and the thickness (a) of the weakened portion (7) has good moldability when the preform (P) is injection molded. In the wall thickness range that can function as an injection passage that exhibits the above, it is set to the smallest possible value, and the inner peripheral surface portion (8) located near the weakened portion (7) has a tapered surface shape whose diameter is increased upward . synthetic resin ampule container, wherein a stepped portion formed of a stepped surface (9) is circumferentially provided. The step portion is (9), from a position opposite to the weakened portion (7), a synthetic resin according to claim 1 which is located above side by approximately the thickness (a) content of weakening portion (7) Ampoule container made. The step portion is (9), the synthetic resin ampule container according to claim 1 which is located opposite the weakened portion (7). Said preform (P) is being molded in either one of polypropylene and polyethylene terephthalate, the thickness of the weakened portion (7) (a) is any one of claims 1 to 3 is 0.35~0.55mm An ampule container made of synthetic resin according to item 1.

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