JP2011057241A - Two-parts type extension blow molding container with spout - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extension blow molding container which easily controls the bottom corner shape of and the film thickness of the container as to a two-parts type extension blow molding container with a spout, obtained by fusing the spout separately injection molded to part corresponding to the spout of the container formed by extension blow molding a preform. <P>SOLUTION: This extension blow mold container comprises an injection molded plastic resin tubular spout B and a tubular body D with a bottom extension blow molded using a preform A with a bottom injection molded using the same resin as the plastic resin for the spout. The bottom end of the opening of the spout B and the top end of the opening of a body D are fused and attached mutually at a joining part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a stretch blow molded container with a two-part spout having a structure in which a spout part is welded to a container body part in a stretch blow molded container with a spout.

  A conventional stretch blow molded container with a spout is formed by injection-molding a preform with a spout (bottomed parison) made of a thermoplastic resin, which is previously provided with a spout and a body for stretching. The body part for stretching of the preform with the inside is loaded into a container-shaped female mold, and the body part for stretching is heated in the mold (at a temperature lower than the glass transition point of the preform), It is formed by stretch blow molding into a container shape by air blow.

  In the case of such a stretch blow molded container with a spout formed by stretch blow molding a preform with a spout (bottom parison) having a spout previously injection molded, the spout portion is blow molded. However, the body part (and bottom part) of the container is stretched in the longitudinal and transverse directions by stretching blow molding the body part for stretching the preform. -It is difficult to control the film thickness in the horizontal direction, particularly the film thickness control in the longitudinal (height) direction in the longitudinal direction and the shape of the bottom corner of the container.

  Therefore, when stretch is performed by air blow in stretch blow molding, depending on the shape of the container, there are problems in the stability of the bottom of the container and the accuracy of the thickness distribution in the height direction of the container. In addition, when heating the stretching body of the preform with a spout in the stretch blow molding of the preform with a spout (bottom parison), the spout of the preform that has been injection-molded in advance is The structure of a stretch blow molded container with a spout that can be easily stretched and deformed due to factors such as the heating operation and can be easily shaped to control the film thickness of the container and the shape of the bottom corner of the container is desired.

  Therefore, Patent Document 1 discloses a container in which a preform without a spout (a bottomed parison having only a stretching body portion) is injection-molded, the preform is stretch-blow-molded into a container shape, and then stretch-blow-molded. A method of forming a stretch blow molded container with a spout by fitting and fusing a spout portion separately injection-molded to a portion corresponding to the spout is disclosed.

Japanese Patent Publication No. 60-17663

  An object of the present invention is a two-part stretch blow molded container with a spout that is obtained by fusing a spout portion separately injection molded to a part corresponding to a spout of a preform formed by stretch blow molding. Then, it is providing the stretch blow molding container which can shape | mold easily the film thickness control of a container and the shape control of the bottom corner part of a container.

The invention according to claim 1 of the present invention uses a cylindrical spout B that is injection-molded with a plastic resin and a bottomed preform A that is injection-molded with the same type of resin as the plastic resin. It is composed of a blown-bottomed cylindrical body part D, and the opening lower end part of the spout part B and the opening upper end part of the body part D are melt-bonded at the joints, respectively. It is a stretch blow molded container with a spout.

  The invention according to claim 2 of the present invention is the stretch blow molded container with a spout according to the first aspect, wherein the spout B is a crystal other than the lower end of the opening by heat setting after injection molding. The stretched blow-molded container with a spout is characterized in that the lower end portion of the opening that has been converted into heat resistance and is not crystallized constitutes the joining portion.

  The invention according to claim 3 of the present invention is the stretch blow molded container with a spout according to claim 1 or 2, wherein the body portion D has an injection-molded ring-shaped reinforcing flange portion C at the upper end opening. A stretch blow molded container with a spout, which is stretch blow molded using the provided bottomed preform A and the upper end of the opening constitutes the joint.

  The invention according to a fourth aspect of the present invention is the stretch blow molded container with a spout according to any one of the first to third aspects, wherein the body portion D is in the direction of the central axis of the bottomed preform A. Note that when the stretching volume is h and the stretching volume in the direction substantially perpendicular to the central axis is w, the ratio h / w = 0 to 0.1 or 0.1 to 0.5. It is a stretch blow molded container with an outlet.

  The stretch blow molded container with a spout of the present invention is separately injected into a portion of an opening corresponding to a spout of a body portion obtained by stretch blow molding a preform (bottom parison) without a spout portion. This is a two-part stretch blow molded container with a spout formed by fusing a molded spout portion. Therefore, when the preform is stretch blow molded to obtain the body portion, the container spout is not yet attached, so in the stretch blow molding of the preform (bottom parison), the preform stretch body portion When heating the container, there is no inconvenience such as expansion or deformation of the preform spout due to heating operation, etc., and it becomes easy to control the film thickness of the container body and the shape of the bottom corner of the container. There is an effect that it is possible to produce a stretch blow molded container with a spout having better shape and strength quality than conventional ones.

The whole side view of the stretch blow molding container with a spout of the present invention. The whole side view of the preform (drawing trunk | drum part) for carrying out stretch blow molding of the trunk | drum of the stretch blow molding container with a spout of this invention. The whole side view of the preform which loaded the trunk | drum part of the stretch blow molding container with a spout of this invention in the cavity of a stretch blow molding metal mold | die part (female type | mold). The whole side view after shape | molding the trunk | drum part of the stretch blow molding container with a spout of this invention in a metal mold | die part with a stretch blow nozzle. The whole side view which joined the spout part to the body part which carried out the stretch blow molding of the stretch blow molding container with a spout of the present invention. The whole side view of the preform in the other Example which loaded the trunk | drum part of the stretch blow molding container with a spout of this invention in the cavity of a stretch blow molding metal mold | die part (female type | mold). The whole side view in the other Example which joined the spout part to the trunk | drum which carried out the stretch blow molding of the stretch blow molding container with a spout of this invention.

  An embodiment of the stretch blow molded container with a spout of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an overall side view illustrating one embodiment of the stretch blow molded container with a spout of the present invention. FIG.

  As shown in FIG. 1, the container 1 of the present invention comprises a cylindrical spout B that is injection-molded with a thermoplastic resin, and a bottomed preform that is injection-molded with the same type of resin as the plastic resin. It is comprised from the bottomed cylindrical trunk | drum part D which fills and wraps the contents, such as a liquid formed and stretch blow-molded. The cylindrical opening lower end B1 of the spout B and the opening upper end D1 of the body D are mutually joined and heated and melted and joined. Note that E is a cap applied to the spout portion B by screwing, fitting or the like.

  The spout B is formed by injection-molding the spout B, and then a part other than the lower end B1 of the cylindrical opening is crystallized by heat setting, and heat resistance is imparted as necessary. Has been. As a result, the spout B is an uncrystallized state in which the opening lower end B1 is not heat-set, and constitutes a well-bonded joint with the upper end D1 of the body D. However, heat resistance is imparted to the entire spout B.

  Further, in the stretch blow molded container with a spout of the present invention, as shown in FIG. 1, the body part D is injection-molded at the opening upper end part D1 with the same kind of resin as the plastic resin constituting the body part D. A ring-shaped reinforcing flange portion C may be provided. Thereby, the cylindrical opening lower end part B1 of the spout part B and the reinforcing flange part C at the opening upper end part D1 of the body part D become a joint part and are heated and melted and joined. .

  Next, the method for producing the stretch blow molded container 1 with a spout according to the present invention will be described in detail below. FIG. 2 is a diagram for molding the body part D of the container 1 with a mold by the stretch blow method. FIG. 2 is a side view of a preform A (bottom parison), and the preform A includes a cylindrical body a1, a bottom a2, and an upper opening a3, and the body A1 and the bottom a2 of the preform A have a wall thickness t1. It is.

  If necessary, the upper opening a3 of the preform A (bottom parison) for stretch blow molding the body part D is provided with a ring-shaped reinforcing flange part C. The thickness of the reinforcing flange part C is as follows. The thickness t3 and the width t4 in the vertical direction are not particularly limited as long as the thickness and width can be stably loaded and held in a mold used in stretch blow molding described later. For example, t1≤t3≤ [t1 + (3-5)] mm and 0≤t4≤ (5-10) mm are suitable.

  The preform A (bottomed parison) shown in FIG. 2 is inserted into the female die F1 from the bottom a2 side of the upper die opening F2 for loading the die F, as shown in FIG. After the reinforcing flange C on the opening a3 side is placed and loaded on the locking projection F3 on the lower end of the opening F2, the blow air nozzle G is mounted in the upper opening a3 of the preform A. .

  Subsequently, the preform A is heated to the stretch blow molding suitable temperature in the female mold F1 and softened, and then hot air a is ejected from the blow air nozzle G into the preform A as shown in FIG. The cylindrical body a1 and the bottom a2 of the preform A are extended to the inner wall surface of the female mold F1, and the body part D is blow-molded. Thereafter, the blow air nozzle G is detached from the upper opening a3 of the preform A.

Subsequently, as shown in FIG. 5, after cooling the die F and the stretched blow molded body part D,
The opening of the spout B that has been manufactured in advance by injection molding on the opening upper end C1 of the reinforcing flange C with the body D and the reinforcing flange C held by the female die F1 and the protrusion F3. The lower end B1 is placed on top of each other with its opening portions aligned. The spout B may be heat-set and crystallized by subjecting the part other than the lower end B1 of the cylindrical opening to heat treatment after injection molding, or heat-set. It may not be.

  Subsequently, the overlapping interface between the lower opening portion B1 of the spout port B and the upper opening portion C1 of the reinforcing flange C is heated and melted by ultrasonic heating means to reinforce the spout portion B and reinforcement. The flange portion C is fused and joined. Thereafter, the mold F is opened along the parting line, and the body part D is taken out from the female mold F1, whereby the stretch blow molded container 1 with a spout of the present invention is formed and manufactured.

  In the stretch blow molded container with a spout of the present invention, the body portion D is not particularly limited to the center axis direction of the bottomed preform A and the stretch volume in a direction substantially orthogonal to the center axis. For example, as shown in FIGS. 3 and 4, when the stretching volume in the central axis direction is h and the stretching volume in the direction substantially perpendicular to the central axis is w, the ratio h / w is 0 <( h / w) ≦ 0.1 or 0.1 ≦ (h / w) ≦ 0.5 is desirable.

  Further, in the stretch blow molded container with a spout of the present invention, as shown in FIGS. 6 and 7, the body part D has a stretch volume in the central axis direction of the bottomed preform A with respect to h and the central axis. When the stretching volume in the substantially orthogonal direction is w, the ratio h / w is preferably set to 0 ≦ (h / w) <0.1.

A ... Preform B ... Outlet part C ... Reinforcing flange part D ... Body part E ... Cap part F ... Mold part F1 ... Cavity G ... Blow air nozzle part a ... Blow air

Claims (4)

  Cylindrical spout part B injection-molded with plastic resin and bottomed cylindrical body part stretch-blow molded using bottomed preform A injection-molded with the same kind of plastic resin A stretch blow molded container with a spout, characterized in that the bottom end of the opening of the spout B and the top end of the body D are melt-bonded at the joint.   The spout portion B is heat-set after injection molding so that a portion other than the lower end portion of the opening is crystallized to impart heat resistance, and the lower end portion of the opening that is not crystallized constitutes the joint portion. The stretch blow molded container with a spout according to claim 1, wherein   The body portion D is stretch blow molded using a bottomed preform A having an injection-molded ring-shaped reinforcing flange portion C at the upper end opening, and the upper end of the opening constitutes the joint portion. A stretch blow molded container with a spout according to claim 1 or 2.   The body portion D has a ratio h / w = 0 to 0.., Where h is the stretching volume in the central axis direction of the bottomed preform A and w is the stretching volume in the direction substantially perpendicular to the central axis. The stretch blow-molded container with a spout according to any one of claims 1 to 3, wherein the container is 1 or 0.1 to 0.5.

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