JP2005088954A - Opening end part and preform of synthetic resin bottle body for hot warmer preservation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening end part and a preform of a synthetic resin bottle body for hot warmer preservation which prevents adhesion of the opening end part to an outer ring from decreasing due to a creep phenomenon of the upper end of the opening end part during hot warmer preservation. <P>SOLUTION: The opening end part of the synthetic resin bottle body for hot warmer preservation is equipped with a cylindrical wall and a thread provided on the outer periphery thereof. The cylindrical wall has a structure wherein the outer peripheral face of the upper end of the cylindrical wall pushed on the outer ring of a cap is more projected than the outer peripheral face of the other cylindrical wall in the radial direction, and the whole body is whitened by thermal crystallization. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is a whitened synthetic resin casing for hot warmer preservation and hot warmer preservation, which has a PCO (plastic closure only) mouth structure and warms the package contents to a temperature of around 60 ° C. The present invention relates to a preform for molding a synthetic resin casing.

  PCO mouth end used for carbonated beverage housing is a synthetic resin housing, especially a biaxially stretched blow molded housing made of polyethylene terephthalate resin, which also has heat resistance dedicated to plastic pill fur proof caps. Are known. In addition, a heat-resistant mouth part which is entirely whitened by thermal crystallization is known as a mouth end part for a pilfer-proof cap including an aluminum pilfer-proof cap. Furthermore, when the thermal crystallization treatment is performed on the end portion of the PCO, the shrinkage deformation accompanying the thermal crystallization is illegally generated, and the cap is not properly mounted and the sealing performance is greatly reduced. As a part of the heat-crystallized heat-resistant mouth end, a cylindrical wall having the same inner and outer diameter as that of the heat-resistant mouth end, and a screw thread of a continuous thread structure provided on the outer periphery of the cylindrical wall The screw thread extension portion, which is the start end portion, is configured to have a constant distance from the upper end surface of the cylindrical wall, and the bead ring and the neck ring provided below the thread thread are connected to the PCO that is a dedicated mouth for the plastic pill fur proof cap. A heat-resistant mouth end portion of a synthetic resin casing has been invented, which is formed into a structure equal to the bead ring and neck ring of the mouth end portion and whitened as a whole by thermal crystallization (see Patent Document 1).

In addition, it is sealed with a stopper cap as a preform that keeps the cap assembled to the crystallized mouth sufficiently strong and reliably prevents accidents where the cap stoppered by the mouth is pulled out. A preform formed by injection molding as a primary molded product made of polyethylene terephthalate resin, which is biaxially stretch-blow-molded into a casing that has been whitened by heat treatment, and is provided on the outer periphery of the opening edge of the mouth. The lower surface of the lower locking corner edge portion of the locking periphery that is assembled and locked with the stopper cap is processed outward with respect to a virtual horizontal plane perpendicular to the center axis of the preform. A preform for molding a synthetic resin casing having an inclined surface has been invented (see Patent Document 2).
JP 2002-53117 A Utility Model Registration No. 2578523 Publication The market for polyethylene terephthalate resin housings has grown rapidly in recent years. From the existing concept of using heat-resistant housings for hot fill applications and general housings for aseptic filling applications. Something that has come off appears. For the case of hot-warmer storage that heats the package contents to a temperature of around 60 ° C, the two concepts described above have begun to be used, but there are problems to be solved and improvements are being promoted. Is the current situation.

  A plastic one-piece cap is used for a polyethylene terephthalate resin casing for hot warmer storage. This cap includes an outer ring, a contact ring and an inner ring. When the cap is attached to the end of the mouth, the outer ring is tightly pressed against the outer R end of the tube wall at the mouth end, along with the inner periphery of the tube wall. The upper end portion of the surface is pressed against the inner ring, the top surface of the cylindrical wall is in contact with the contact ring, and the tip end portion of the cylindrical wall is sandwiched between both rings to ensure sealing performance.

  However, the upper end of the cylinder wall pressed against the outer ring undergoes a creep phenomenon during hot warmer storage, which causes the cylinder wall to fall inward, reducing the degree of adhesion of the cylinder wall to the outer ring, and at the same time the inner side of the cylinder wall. The contact surface to the inner ring also changes due to the deformation of the upper end portion of the cylindrical portion, and the degree of adhesion to the inner ring is significantly reduced.

  For example, after storing a polyethylene terephthalate housing (capacity 280 ml) in an atmosphere at around 60 ° C. for 21 days, the difference between the mouth inner diameter before and after capping in the vicinity of the top surface of the mouth end portion was examined. The difference between the inner diameter of the mouth before and after capping in the vicinity of the surface is about 0.13 mm. From this result, it can be seen that the end of the mouth falls down by hot warmer storage for a long time, and the sealing effect by the outer ring decreases.

  Moreover, although the mouth edge part of patent document 1 solved the subject of obtaining the mouth edge part for PCO heat resistance using the structure of the conventional PCO edge part, This does not solve the phenomenon that the upper end causes a creep phenomenon and the adhesion of the mouth end to the outer ring is lowered.

  In addition, the preform described in Patent Document 2 solves the problem of maintaining the engagement of the screw portion of the crown cap to the screw portion of the whitened mouth, but is molded using the preform. The upper end of the mouth end of the casing thus formed does not eliminate the creep phenomenon in the hot warmer, and hence the deterioration of the adhesion of the mouth end to the outer ring.

  An object of the present invention is to provide a synthetic resin casing for hot warmer storage that prevents the upper end of the mouth end portion from undergoing a creep phenomenon during hot warmer storage, thereby preventing the adhesion to the outer ring of the mouth end portion from being lowered. The mouth end and the upper end of the mouth end during the storage of the hot warmer are prevented from creeping, and therefore the adhesiveness to the outer ring of the end of the mouth is prevented from being lowered. Renovation is provided.

  The invention according to claim 1 solves the problem related to the mouth end of the synthetic resin casing for hot warmer storage, and is the mouth end of the synthetic resin casing for hot warmer storage, The cylinder wall has a structure in which a cylindrical wall upper end outer circumferential surface pressed against the outer ring of the cap protrudes in a radial direction from the outer circumferential surface of the other cylindrical wall. The gist is the mouth end of a synthetic resin casing for preserving hot warmers, characterized in that is whitened by thermal crystallization.

  According to the mouth end portion of the present invention, since the cylindrical wall upper end outer peripheral surface pressed against the outer ring of the cap has a structure projecting in the radial direction from the other cylindrical wall outer peripheral surface, it is strongly pressed by this structural portion. The degree of adhesion with the outer ring has been increased in advance, so that even if the cylinder wall is deformed inward, the outer ring that has been pushed outward by the outer peripheral surface of the cylinder wall is deformed following the structure. The adhesion between the two is maintained.

  Further, the top surface of the mouth end portion can be provided with a step structure whose inner peripheral side is lower than the outer peripheral side. With this configuration, the top surface of the mouth end portion is more closely attached to the contact ring, thereby preventing the mouth end portion from easily falling inward.

  In the mouth end portion of the present invention, an inclined portion inclined toward the top surface of the mouth end portion can be provided in the vicinity of the seal surface sealed by the inner ring on the inner peripheral surface of the mouth end portion. With this configuration, the mouth end is deformed inward by providing an inclined portion inclined toward the top surface of the mouth end near the seal surface sealed by the inner ring on the inner peripheral surface of the mouth end. However, the inclined portion is in close contact with the inner ring, thereby preventing the contact area from decreasing.

  Invention of Claim 4 solves the subject regarding the above-mentioned preform for molding a plastic body for preserving hot warmers, and is a bottomed cylindrical preform, the mouth of which is a cylinder wall The outer peripheral surface of the cylindrical wall corresponding to the upper end surface of the cylindrical wall at the mouth end portion of the synthetic resin casing for hot warmer storage, which is pressed against the outer ring of the cap. The gist of the present invention is a preform for molding a synthetic resin casing for preserving hot warmers, characterized by having a structure projecting in a radial direction from the other outer peripheral surface of the cylindrical wall.

  According to this preform, the synthetic resin casing for hot warmer storage according to claim 1 can be manufactured.

  5. The preform according to claim 4, wherein the top surface of the open end portion can be provided with a step structure whose inner peripheral side is lower than the outer peripheral side. By this preform, the top surface of the mouth end portion is strongly adhered to the contact ring of the cap, and a synthetic resin casing for hot warmer storage in which the mouth end portion is prevented from easily falling inward can be manufactured.

  5. The preform according to claim 4, wherein an open end is provided in the vicinity of a region corresponding to a seal surface sealed by an inner ring of a cap at a mouth end of a synthetic resin casing for hot warmer storage on an inner periphery of a cylindrical wall. An inclined portion inclined toward the top surface of the portion can be provided. By this preform, even if the mouth end portion is deformed inward, the inclined portion is in close contact with the inner ring of the cap, thereby producing a synthetic resin casing for hot warmer storage that prevents the reduction of the contact area. it can.

  The mouth end portion of the synthetic resin casing for hot warmer storage of the present invention includes a cylindrical wall and a screw thread provided on the outer periphery thereof, and the cylindrical wall has a cylindrical wall upper end outer peripheral surface that is pressed against the outer ring of the cap. It has a structure that protrudes in the radial direction from the outer peripheral surface of the cylindrical wall, and is characterized in that the whole is whitened by thermal crystallization, and the outer peripheral surface of the upper end of the cylindrical wall that is pressed against the outer ring of the cap Since it has a structure that protrudes in the radial direction from the outer peripheral surface of the cylinder wall, the outer ring can be strongly pressed by this structure part in advance, so that the degree of adhesion with the outer ring can be increased in advance, and appropriate sealing performance is maintained for a long time. It is possible to provide a synthetic resinous casing for storing hot warmers. In addition, by using the preform of the present invention and blow-molding, it is possible to produce a synthetic resin casing for hot warmer storage that can maintain a proper sealing property for a long time.

  Next, the mouth end portion of the synthetic resin casing for preserving hot warmers of the present invention will be described with reference to the drawings.

  FIG. 1 shows a partial cross-sectional view of the mouth end of a synthetic resin casing for preserving hot warmers according to the present invention. FIG. 2 is an enlarged sectional view of a portion surrounded by a circle A in FIG. 3 is a cross-sectional view showing a state in which a cap is attached to the mouth end portion shown in FIG.

  The mouth end portion 1 of the synthetic resin casing for hot warmer storage of the present invention includes a cylindrical wall 2 and a screw thread 3 provided on the outer periphery thereof, and the cylindrical wall 2 is pressed against the outer ring of the cap. The outer peripheral surface 4 has a structure projecting in the radial direction from the other outer peripheral surface of the cylindrical wall, and the whole is whitened by thermal crystallization. The structural portion is formed in an area of 2 mm or less from the top surface of the mouth end portion, and there is a step a between the structural portion and the cylindrical wall 2 continuous therewith.

  Further, the top surface of the mouth end 1 is lower on the inner peripheral side 5b than on the outer peripheral side 5a, and there is a step between them.

  Further, an inclined portion 6 inclined toward the top surface of the mouth end 1 is provided in the vicinity of the seal surface sealed by the inner ring on the inner peripheral surface of the mouth end 1. The inclination γ ° of the inclined portion with respect to the inner peripheral surface of the cylindrical wall is 2 to 18 °, and the inclined portion is transferred to the inner peripheral side 5b of the top surface via a curved surface. The inclined portion is formed in an area of 4 mm or less from the inner peripheral side 5b of the top surface.

  FIG. 3 shows a state in which a cap 7 is attached to the mouth end 1 shown in FIG. Since the cylindrical wall upper end peripheral surface 4 pressed against the outer ring 8 of the cap 7 protrudes in the radial direction from the other outer peripheral surfaces of the cylindrical wall, the cylindrical wall upper end peripheral surface 4 is pressed strongly by the cylindrical wall upper end peripheral surface 4 to be in close contact with the outer ring 8 in advance. Therefore, even if the inward deformation of the cylindrical wall 2 occurs, the outer ring 8 pushed outward by the outer peripheral surface 4 of the upper end of the cylindrical wall is deformed following the structure portion, The adhesion is maintained.

  Further, the outer peripheral side 5a of the top surface of the mouth end portion is tightly adhered to the contact ring 9, thereby preventing the upper end of the mouth end portion 1 from easily falling inward.

  Further, since there is an inclined portion 6 inclined toward the top surface of the mouth end portion 1 in the vicinity of the seal surface sealed by the inner ring 10, the inclined portion 6 is not deformed even if the mouth end portion 1 is deformed inward. The inner ring 10 is in close contact with the inner ring 10, thereby preventing the contact area from being reduced.

  The synthetic resin casing for hot warmer storage provided with the mouth end of the present invention is formed by blow molding using polyethylene terephthalate, polypropylene, polycarbonate, etc., and particularly polyethylene terephthalate is water vapor, oxygen, odor, ultraviolet It is suitable because it is excellent in permeation prevention properties. Alternatively, an in-mold label forming label may be attached to the blow mold, the in-mold label forming may be performed, and the housing having the in-mold label on the outside of the housing.

  FIG. 4 shows a part of a preform for molding a synthetic resin casing for preserving hot warmers according to the present invention. The preform 11 of the present invention is formed as a bottomed cylinder, and an open end portion that forms a housing opening includes a cylindrical wall 12 and a screw thread 13 provided on the outer periphery thereof. The outer peripheral surface 14 of the cylindrical wall corresponding to the upper peripheral surface of the cylindrical wall at the mouth end portion of the synthetic resin casing for hot warmer being pressed against the outer ring of the cap is arranged in a radial direction with respect to the outer peripheral surface of the other cylindrical wall. It has a protruding structure, and the whole is whitened by thermal crystallization. The structural part is formed in an area of 2 mm or less from the top surface of the preform 11, and there is a step between the structural part and the cylindrical wall 12 continuous therewith. The preform 11 has a structure in which the outer peripheral surface of the upper end of the cylindrical wall pressed against the outer ring of the cap is protruded in the radial direction from the outer peripheral surface of the other cylindrical wall. The outer ring 8 that has been pushed outward by the outer peripheral surface 14 of the upper end of the cylindrical wall follows the structural portion and is deformed even when the inward deformation of the cylindrical wall 2 occurs. And the synthetic resin casing for hot warmer preservation | save provided with the mouth edge part by which the adhesiveness between both is hold | maintained can be manufactured.

  Further, the top surface of the preform 11 is lower on the inner peripheral side 15b than on the outer peripheral side 15a, and there is a step between them. Due to the presence of this step, the top surface of the mouth end is more closely attached to the contact ring of the cap, and a synthetic resin casing for hot warmer storage that prevents the mouth end from easily falling inward is manufactured. be able to.

  Further, on the inner peripheral surface of the preform 11, the mouth end portion of the synthetic resin casing for preserving hot warmers is directed toward the top surface of the preform 11 in the vicinity of the region corresponding to the seal surface sealed by the inner ring of the cap. An inclined part 16 is provided. The inclination γ ° of the inclined portion 16 with respect to the inner peripheral surface of the cylindrical wall is 2 to 18 °, and the inclined portion 16 is transferred to the inner peripheral side 5b of the top surface via a curved surface. The inclined portion 16 is formed in a region of 4 mm or less from the inner peripheral side 15b of the top surface. According to this preform 11, the mouth end portion is provided with an inclined portion, and even if the mouth end portion is deformed inward, the inclined portion is in close contact with the inner ring of the cap, thereby preventing a decrease in the contact area. A synthetic resin casing for preserving warmers can be produced.

  As a molding material for the preform 11, polyethylene terephthalate, polyethylene, polypropylene, polycarbonate, or the like can be applied.

  The upper end of the mouth end during the hot warmer causes a creep phenomenon, so that the adhesion of the mouth end to the outer ring is prevented from being reduced. For example, a packaging case, particularly a composition for preserving hot warmers It can be applied to various uses such as a resin casing.

It is a partial cross section figure of the mouth edge part of the synthetic resin casings for hot warmer preservation | save of this invention. FIG. 2 is an enlarged cross-sectional view of a portion surrounded by a circle A in FIG. 1. It is sectional drawing which shows the state which attached the cap to the mouth edge part shown in FIG. 1 is a partial cross-sectional view of a preform for molding a synthetic resinous casing for hot warmer storage according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Portion | end part 2 Cylinder wall 3 Screw thread 4 Cylinder wall upper end outer peripheral surface 5a Outer peripheral side of top surface 5b Inner peripheral side of top surface 6 Inclined portion 7 Cap 8 Outer ring 9 Contact ring 10 Inner ring 11 Preform 12 Cylindrical wall 13 Screw thread 14 Cylinder wall upper end outer peripheral surface 15 Inclined part

Claims (6)

  It is a mouth end portion of a synthetic resin casing for preserving hot warmers, and includes a cylindrical wall and a screw thread provided on the outer periphery thereof, and the cylindrical wall is connected to the outer peripheral surface of the upper end of the cylindrical wall pressed against the outer ring of the cap. A mouth end portion of a synthetic resin casing for preserving hot warmers, characterized in that it has a structure projecting in a radial direction from the outer peripheral surface of a cylindrical wall, and the whole is whitened by thermal crystallization.   The mouth end portion of the synthetic resin casing for hot warmer storage according to claim 1, wherein the top surface of the mouth end portion has a step structure in which the inner peripheral side is lower than the outer peripheral side.   The mouth end portion according to claim 1 or 2, wherein an inclined portion inclined toward the top surface of the mouth end portion is provided in the vicinity of a seal surface sealed by an inner ring on an inner peripheral surface of the mouth end portion. .   A bottomed cylindrical preform, the mouth portion of which includes a cylindrical wall and a screw thread provided on the outer periphery thereof, and the cylindrical wall is pressed against the outer ring of the cap. A synthetic resin casing molding for hot warmer storage characterized by having a structure in which a cylindrical wall upper end outer peripheral surface corresponding to a cylindrical wall upper end surface of a mouth end portion of the mouth end portion protrudes in a radial direction from other cylindrical wall outer peripheral surfaces Preform for.   5. A preform for molding a plastic body for preserving hot warmers according to claim 4, wherein the top surface of the open end portion has a step structure in which the inner peripheral side is lower than the outer peripheral side. On the inner periphery of the cylinder wall, the slope of the mouth end portion of the synthetic resin casing for preserving hot warmers is inclined toward the top surface of the open end near the area corresponding to the seal surface sealed by the inner ring of the cap The preform for molding a plastic body for preserving a hot warmer according to claim 4 or 5, wherein a part is provided.