JP2005329958A - Resin container and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin container which has an upper member that can be easily separated from an incision, and is applicable to a variety of use, such as an ampul, and to provide a manufacturing method of the container. <P>SOLUTION: The resin container comprises a container body 11 which has a mouth 14 formed in continuity with the shoulder 13 of a trunk 12 containing a liquid at the upside of the shoulder 13, a bulged part 21 which is formed to be integral to the mouth 14 at its upside, where the inside of the bulged part 21 communicates with the mouth 14, and a tab 31 which is formed at the upside of the bulged part 21 and is severed and removed, together with the bulged part 21, upon using the container. The incision 41 of an almost V shape is formed circumferentially along the outer circumferential surface of the boundary between the mouth 14 and the bulged part 21. On the inner circumferential surface of the incision 41, a conical inner tapered surface 43 is formed to be continuous from upper to lower parts across the front end of the incision 41 and widen in diameter upwardly. The inner tapered surface 43 has a widening angle Y smaller than the widening angle X of a conical outer tapered surface 42 which is formed on the upside of the front end of the incision 41 and widens upwardly in diameter. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an integrally molded resin container and a method for manufacturing the same.

  Conventionally, ampules for storing chemicals and the like are generally made of glass, but in recent years, there has been a demand for development of resin-made ampules in place of glass mainly for the purpose of reducing manufacturing costs. As such a resin ampoule, for example, as shown in FIG. 6, a trunk portion 91 that contains contents, a neck portion 92 that is located above the trunk portion 91 and that communicates with the inside of the trunk portion 91, and a neck portion 92, and a shoulder portion 93 that connects between the body portion 91 and the neck portion 92. The neck portion is formed on the outer peripheral surface of the thick wall portion 94 located at the boundary portion between the shoulder portion 93 and the neck portion 92. There is disclosed a resin ampoule provided with a cut portion 95 and having a cut angle θ of the cut portion 95, a radius of curvature R at the tip of the cut portion 95, and the like within predetermined ranges (see Patent Document 1).

However, in the conventional resin ampoule, the notch 95 is precisely designed to make it easy to break off the neck 92 when in use, but the parison is sandwiched from the outside with a mold, and the notch 95 is formed by blow molding. Since the manufacturing process for forming is employed, the shape of the inner peripheral surface of the cut portion 95 becomes random, and it is difficult to form a cylindrical shape as shown in FIG. For this reason, if manufacturing conditions are not fully examined, the thickness of the tip of the cut portion 95 is likely to vary, and in some cases, a defective product in which the neck portion 92 is difficult to be broken may be manufactured.
JP 2000-37442 A

  The present invention has been made in view of the above-mentioned problems, and the object thereof is to easily detach the upper member from the cut portion, and to make a resin container applicable to various uses including an ampoule and its manufacture. It is to provide a method.

  In order to achieve the above object, the invention of claim 1 is directed to a cylindrical body portion in which a liquid is stored, a container main body having a mouth portion extending upward from a shoulder portion of the body portion, and an upper side of the mouth portion. And a bulging portion whose inside communicates with the mouth portion, and a knob portion that is formed to stand above the bulging portion and is separated and removed together with the bulging portion when in use. The outer peripheral surface of the boundary portion between the mouth portion and the bulging portion is a resin container in which a substantially V-shaped cut portion is formed around the inner peripheral surface of the cut portion. A conical inner taper surface is formed which is continuous over the top and bottom of the tip of the cut portion and expands upward. The inner taper surface expands upward from the tip of the cut portion. Having an opening angle smaller than the opening angle of the conical outer tapered surface And it features.

  According to a second aspect of the present invention, in the resin container according to the first aspect, the inner peripheral surface of the upper end of the mouth portion is formed in a smooth, substantially cylindrical shape having no irregularities. According to a third aspect of the present invention, in the resin container according to the first or second aspect, the knob portion is formed in a thin plate shape.

  Moreover, invention of Claim 4 is a method of manufacturing the resin container according to any one of Claims 1 to 3, wherein the parison is sandwiched from the outside with a lower mold for forming the cut portion and the container body. In addition, it is characterized in that it has a step of blow molding in a state where a taper pin having the same opening angle as the inner taper surface is driven into a portion where the cut portion is formed inside the parison.

  According to the resin container of the present invention, since the inner tapered surface has an opening angle smaller than the opening angle of the outer tapered surface, the thickness of the cut portion becomes thinner toward the tip of the cut portion, and the tip of the cut portion Becomes the thinnest. Therefore, since the brittleness at the tip of the cut portion is increased, if the knob portion is twisted in the circumferential direction or the knob portion is pressed from one direction with the container body held, the knob portion is easily separated integrally with the bulging portion. be able to.

  Next, the present invention will be described in detail with reference to the accompanying drawings. 1 is a front view of a resin container showing an example of the present invention, FIG. 2 is a side view of the resin container of FIG. 1, and FIG. 3 is a view when the upper part of the resin container of FIG. It is an expanded sectional view showing a state. The illustrated resin container is mainly composed of a container body 11, a bulging portion 21, and a knob portion 31, and these are integrally molded using polyethylene terephthalate (PET) as a raw material.

  The container body 11 has a bottomed cylindrical body portion 12 having a height of about 30 mm and an outer diameter of about 20 mm, and a mouth portion 14 that continues upward from the shoulder portion 13 of the body portion 12. About 10 mL of liquid is stored inside. At the upper end of the mouth part 14, an annular thick part 15 bulging slightly outward from the mouth body is provided, and the annular thick part 15 is set to have an inner diameter of about 4 mm. The bulging portion 21 is formed in a substantially ball shape continuously on the upper side of the annular thick portion 15, and the inside thereof is a cavity and communicates with the container body 11 via the mouth portion 14. The knob portion 31 is erected on the upper side of the bulging portion 21 and is formed in a thin plate shape with a substantially home base shape when viewed from the front.

  On the outer peripheral surface at the boundary between the upper end of the annular thick portion 15 and the lower end of the bulging portion, a substantially V-shaped cut portion 41 is formed to circulate. More specifically, the upper side from the tip (deepest part) of the cut portion is a conical outer tapered surface 42 whose diameter increases upward, and the opening angle X of the outer tapered surface 42 (that is, the taper angle). Is set to 90 degrees (see FIG. 3). Further, the lower side from the tip of the cut portion 41 is formed into a tapered conical surface 43 that slightly inclines downward, and this conical surface 43 constitutes the upper end surface of the annular thick portion 15. Yes.

  Then, the inner peripheral surface of the cut portion 41 is cut from a position slightly below the tip of the cut portion 41 (that is, near the upper end of the inner peripheral surface of the annular thick portion 15) to a portion corresponding to the upper end of the cut portion 41. A conical inner taper surface 44 that is continuous over the top and bottom of the tip of the portion 41 and expands upward is formed, and the opening angle Y of the inner taper surface 44 is set to 30 degrees. And the thickness t of the front-end | tip part of the notch part 41 is shape | molded by about 0.05 mm, and the brittleness of the notch part 41 front-end | tip is improved by comprising the inner taper surface 44 in addition to the notch part 41 as mentioned above. .

  That is, as shown in FIG. 3, since the inner tapered surface 44 has an opening angle Y smaller than the opening angle X of the outer tapered surface 42, the thickness t of the cut portion 41 becomes thinner toward the tip of the cut portion 41. Thus, the tip of the cut portion 41 is the thinnest. Therefore, since the brittleness at the tip of the cut portion 41 is increased, when the knob portion 31 is twisted in the circumferential direction while holding the container body 11 in use, the tip of the cut portion 41 is twisted and integrated with the bulging portion 21. The knob part 31 can be easily separated. Alternatively, when the knob portion 31 is pressed from one direction at the time of use, the tip of the cut portion 41 is pushed out, and the knob portion 31 can be easily separated integrally with the bulging portion 21. In the present invention, in consideration of the container size, the force of the user's fingertip, and the like, the resin container can be opened by one of the two types of separation operations alone or by using both in combination.

  In addition, the upper end portion of the annular thick portion 15 formed by opening the bulging portion 21 and the knob portion 31 integrally is smooth, and the occurrence of stringing and burrs is suppressed. Therefore, even when the fingertip strongly touches the upper end portion of the annular thick portion 15 after the container is opened, it is excellent in safety without being cut (see FIG. 4).

  In addition, it does not specifically limit about the liquid accommodated in the inside of a resin container in this invention, For example, a pharmaceutical, a quasi-drug, cosmetics, etc. are mentioned. For example, when a medicine for beverages is stored, a straw can be inserted into the container after the container has been opened, and the medicine can be used for drinking. In addition, when cosmetic emulsion is stored, after opening the container, turn the container upside down, press the body of the container, or shake the container to take out the cosmetic emulsion from the palm and put it to use Can do.

  The resin container of the present invention is manufactured by blow molding a parison formed by extruding a molten resin. For blow molding, a so-called blow-fill-seal system (BFS system), which simultaneously performs container molding, liquid filling, and sealing, is applied, and the parison is a mold (usually a split mold is used) ), And a compressed air is blown into the parison to mold the container along the parison surface (hereinafter, this molding method is referred to as direct blow molding). A method of forming a container (hereinafter referred to as “suction molding”) by providing a pore of about 3 mm and sucking the parison through this pore to form a vacuum or reduced pressure and molding the container along the mold surface. A resin container is manufactured by combining or in combination. As described above, the present invention is characterized in that the notch 41 and the inner tapered surface 44 of the inner peripheral surface thereof are formed into a predetermined shape, whereby the tip of the notch 41 is thinned to increase brittleness. The forming method of the cut portion 41 and the inner tapered surface 44 will be mainly described.

  FIG. 5 is a cross-sectional explanatory view showing a state when the periphery of the mouth of the container is molded. Reference numeral 51 denotes a parison formed by extruding a molten resin, and a portion for molding the periphery of the mouth portion 14 is schematically illustrated. Reference numerals 52 and 52 denote lower molds for molding the container body, which follow the shape of the body portion 12 from the bottom portion, the mouth portion 14 continuous on the upper side, and the boundary portion between the mouth portion 14 and the bulging portion 21. A molding surface is formed (in FIG. 5, a portion for molding the periphery of the mouth portion 14 of the container is schematically illustrated). 53 is a taper forming surface for forming the outer taper surface 42, and its opening angle X1 is set to 90 degrees. Further, 54 continuous to the lower side of the taper forming surface 53 is a thick portion forming surface for forming the annular thick portion 15. The V-shaped cut portion 41 is formed by the taper forming surface 53 and the upper portion of the thick-walled portion forming surface 54.

  Reference numeral 61 denotes a taper pin for forming the inner tapered surface 44, which is formed in a substantially cylindrical shape as a whole, is contracted toward the tip on the lower side of the main body 62, and has an opening angle Y1 (taper angle) of 30 degrees. ) And a substantially cylindrical tip having an outer diameter (about 4 mm) corresponding to the inner diameter of the annular thick portion 15 at the lower end from the taper portion 63. A portion 64 is formed.

  At the time of molding, as shown in FIG. 5, the parison 51 is sandwiched between lower molds 52 and 52, and a taper pin 61 is driven into a portion where the cut portion 41 is molded inside the parison 51. The parison 51 is sucked through pores (not shown) provided at various locations of 52, and thereby the peripheral portion of the mouth portion 14 is formed along the parison 51 along the mold surface. In the present invention, the tip of the tapered portion 63 is driven below the boundary portion (the portion indicated by B in the figure) between the tapered molding surface 53 and the thick portion molding surface 54. As a result, an inner tapered surface 44 is formed on the inner peripheral surface of the notched portion 41 after molding, and the inner tapered surface 44 is continuously extended over the top and bottom of the notched portion 41 and is increased in diameter upward, and the inner tapered surface 44 is opened. The angle Y is smaller than the opening angle X of the outer tapered surface 42.

  Further, the wall thickness t at the tip of the cut portion 41 can be easily controlled by moving the taper pin 61 in the vertical direction. Specifically, the wall thickness t is determined by the gap (clearance) between B and the taper molding surface 53 in the drawing. Therefore, when the taper pin 61 is moved downward, the gap between B and the taper molding surface 53 in the drawing becomes small, and the thickness t can be made thin. On the other hand, when the taper pin 61 is moved upward, the gap between B and the taper molding surface 53 in the figure becomes large, whereby the thickness t can be increased.

  Here, in this embodiment, the opening angle X1 of the taper molding surface 53 of the lower mold 52 is set to 90 degrees, and the opening angle Y1 of the taper portion 63 of the taper pin 61 is set to 30 degrees. Except for setting the opening angle Y1 of the tapered portion 63 to be smaller than the opening angle X1 of the tapered molding surface 53, the opening angle X1 of the tapered molding surface 53 and the opening angle Y1 of the tapered portion 63 are not limited to these. For example, in order to easily control the wall thickness t at the tip of the cut portion 41, it is preferable to set the opening angle Y1 to 1/6 to 1/2 with respect to the opening angle X1. In FIG. 5, the opening angle Y1 of the tapered portion 63 is set to 30 degrees. However, in order to further improve the thickness control of the tip of the cut portion 41, it is preferable to set the opening angle Y1 to 15 to 20 degrees. .

  Further, when the taper pin 61 is driven into the parison 51 at the time of molding, the parting line generated when molding using a split mold is not formed on the inner peripheral surface of the annular thick portion 15 and there is no unevenness. It is formed in a smooth substantially cylindrical shape. For this reason, for example, the trunk part fitted along the inner peripheral surface of the annular thick part 15, and the flange part extending in the circumferential direction from the upper end part of the trunk part and extending on the upper end face of the annular thick part 15 If the temporary stopper consisting of the above is provided as a set, the user inserts the temporary stopper into the opening of the annular thick part 15 formed after the container is opened, so that the liquid contained in the container body is liquid. Can be tightly sealed.

  When the molding of the lower portion from the peripheral portion of the mouth portion 14 is completed as described above, the moving container body 11 is filled with the liquid by the filling nozzle (not shown) mounted inside the taper pin 61. Next, the taper pin 61 is pulled upward, the parison 51 above the container mouth portion 14 is sandwiched between upper molds 55, 55, and the parison is passed through pores (not shown) provided in various places of the upper mold 55. 51 is sucked, and thereby the bulging part 21 and the knob part 31 are formed along the parison 51 along the mold surface. Finally, the upper mold 55 and the lower mold 52 are separated from the container, and the entire process is completed.

  The present invention is not limited to the illustrated embodiment, and the material, shape, size, position, and the like of each member can be changed as appropriate without departing from the scope of the invention. The raw material resin is not limited to the above-described PET, and a known resin used when manufacturing a container by blow molding, such as polyethylene (PE) or polypropylene (PP), can be used. Among these, resins (PET, PP, etc.) that are harder than PE and difficult to open when a large container is molded are more preferable. The present invention is characterized in that the knob portion 31 can be easily separated by controlling the thickness t at the tip of the cut portion 41 to be thin even when the diameter of the mouth portion 14 is set larger than that of the conventional one. Therefore, the inner diameter of the mouth portion 14 (corresponding to the inner diameter of the annular thick portion in the illustrated embodiment) is not limited to about 4 mm in the drawing, and the same effect is exhibited even at 10 to 20 mm. Further, the thickness t at the tip of the cut portion 41 is not limited to about 0.05 mm in the drawing, and can be set as appropriate according to the inner diameter of the mouth portion 14, the brittleness of the raw material resin, and the like.

  Further, the annular thick wall portion 15 shown in the drawing is provided as necessary for preventing the draw-down of the parison when the cut portion 41 is formed, or for other design purposes, and is an essential member in the present invention. Absent. Further, the shape of the knob part 31 is not limited to the illustrated form, and any form can be adopted as long as the twisting operation and the pressing operation can be performed when the container is opened.

It is a front view of a resin container showing an example of the present invention. It is a side view of the resin container of FIG. It is an expanded sectional view which shows a state when the upper part of the resin container of FIG. 1 is cut | disconnected by the AA line. It is an expanded sectional view which shows the state of the cut end of a mouth part upper end surface when the resin-made container of FIG. 1 is opened. It is sectional explanatory drawing which shows a state when shape | molding the mouth part periphery of a container. It is the figure which showed the conventional resin container, (A) is an expanded sectional view of the vicinity of a notch part, (B) is an enlarged view of (A).

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Container main body 12 Trunk part 13 Shoulder part 14 Mouth part 15 Annular thick part 21 Enlarged part 31 Knob part 41 Cut part 42 Outer taper surface X Open angle 43 Conical surface 44 Inner taper surface Y Open angle 51 Parison 52 Lower metal Mold 53 Tapered molding surface X1 Opening angle 54 Thick part molding surface 55 Upper die 61 Taper pin 62 Main body Y1 Opening angle 63 Taper part 64 Tip part

Claims (4)

A cylindrical body containing liquid, a container body having a mouth part continuous from the shoulder part to the upper side of the body part, and an upper part of the mouth part are integrally formed, and the inside communicates with the mouth part. And an outer periphery of a boundary portion between the mouth portion and the bulging portion. On the surface is a resin container formed with a substantially V-shaped cut portion that circulates,
The inner peripheral surface of the cut portion is formed with a conical inner taper surface that is continuous over the top and bottom of the tip of the cut portion and expands upward, and the inner taper surface is formed on the cut portion. A resin container having an opening angle smaller than an opening angle of a conical outer taper surface whose diameter increases upward from the tip.   2. The resin container according to claim 1, wherein an inner peripheral surface of an upper end of the mouth portion is formed in a smooth and substantially cylindrical shape without unevenness.   The resin container according to claim 1 or 2, wherein the knob portion is formed in a thin plate shape.   It is a method of manufacturing the resin container according to any one of claims 1 to 3, wherein a parison is sandwiched from outside with a lower mold for molding the cut portion and the container body, and the cut portion is formed inside the parison. The method for producing a resin container is characterized by comprising a step of blow-molding a taper pin having the same opening angle as the inner tapered surface in a portion where the material is molded.

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