JPS6143535A - Manufacture of polyester container with handle - Google Patents

Abstract

PURPOSE:To obtain a polyester container provided with a handle having a hollow part by one time biaxial orientation blow molding, by a method wherein the surface of a wall of a main part of a cavity of a mold is kept at the temperature lower than the glass point and a panel part of a tonguelike part is kept at the temperature higher than the glass point. CONSTITUTION:A heated an injection-molded bottomed polyethylene terephthalate parison is loaded into a mold 8, a press surface 14a of a trunk cavity and the inside 15a of a sleeve which are to be brought into contact with an intermediate wall part 17c are kept at the temperatures higher than the glass point of polyethylene terephthalate applicable after orientation and on the one hand, the inside of the other mold is kept at the temperature lower than the glass point. A molded material 17 is formed through biaxial orientation blow molding by fitting an orientation bar into the molded material with pressure after that. As trunk wall parts 17a, 17b other than the intermediate wall part 17c are quenched through the inside 10b of the trunk cavity and a press components 14 confronting with each other are made to break into the molded material 17 immediately when the temperatures of the trunk parts 17a, 17b become low, only the intermediate wall part 17c is deformed and a main part of a container an a handle on the circumference of a part which is to be a panel part 4 are demarcated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a handle-equipped/IJ ester container, and more particularly to a biaxially stretched blown polyester container having a handle having a hollow portion communicating with the main portion of the container. This invention relates to a method for manufacturing a container.

(Prior Art) Conventionally proposed manufacturing methods for biaxially stretched blown polyester containers having hollow handles include, for example, heat-sealing a preliminary biaxially stretched blown polyester container at a semi-molten stage to close holes. A handle original shape having a handle shape was formed, and then this was again biaxially stretched blow molded to form a predetermined shape.

(Problems to be Solved by the Invention) Containers made by this method are difficult to completely seal the heat-sealed part on the inside of the handle (hole side) (polyester resin has a low melting point). It is generally difficult to heat-seal (compared to polyolefin resins, etc.) because of its high temperature and is generally difficult to heat-seal.In addition, the process is complicated because biaxial stretch blow molding is performed twice, and the quality is unstable. have a problem

(Object of the Invention) The present invention provides a method for manufacturing a biaxially stretched blown polyester container with a handle that can be formed by one-time biaxially stretched blow molding and that is free from the risk of leakage of the content liquid from the inside of the handle. With the goal.

(Structure of the Invention) The present invention includes a handle having a hollow portion that communicates with the main portion of the container, and the handle and the main portion of the container are connected to each other by a panel portion formed of opposing and close wall portions of the container. A method for manufacturing a biaxially stretched blown polyester container with a handle, the cavity being defined by a main part of the cavity having a shape corresponding to the main part of the container, and a surface corresponding to the outer end surface of the handle, and having a diameter and a thickness of the hollow part. The handle and the/
The wall surface of the portion of the tongue portion corresponding to the panel portion is formed by the end surfaces of the pressing member, and the wall surface of the portion of the tongue portion corresponding to the panel portion is opposite to each other. Using a mold, the wall surface of the main portion of the cavity and the wall surface of the portion of the tongue portion corresponding to the outer end surface of the handle are maintained at a temperature lower than the glass transition point of the polyester;
In a state where the panel portion of the tongue portion and its peripheral portion are maintained at a temperature equal to or higher than the glass transition point, the panel portion is formed by biaxial stretching blow molding of polyester bottomed/4′ phosphorus 7. The present invention provides a method for manufacturing a biaxially stretched blown polyester container with a handle.

In the present invention, polyester refers to thermoplastic saturated polyester resins such as polyethylene terephthalate, polytetramethylene terephthalate, etc., or copolymers or blends thereof.

(Aspects of containers manufactured by the method of the present invention) Figures 1 and 2
Figure 1 shows a first embodiment of the biaxially stretched blown polyester container with a handle of the present invention, in which a panel portion 4 is formed between the container main portion 2 and the handle 3. Concave portions 5 having the no-R flannel portion 4 as the bottom are formed on both sides of the no-R flannel portion 4, so that the handle 3 can be easily grasped with fingers. The handle 3 has a hollow part 6 formed therein, and the hollow part 6 communicates with the inside of the container main part 2, so that the contents such as liquid can also be accommodated inside the handle 3, that is, the hollow part 6. It has become so. The panel part 4 is connected to the main part 2 of the container.
and two closely spaced wall portions 4a connected to each wall portion 2a and 3a of the handle 3.

FIG. 3 shows the main parts of a container according to the second embodiment, which has almost the same configuration as the first embodiment, but differs only in that there is a slight gap 7 between the opposing wall portions 4a of the panel portion 4. This shows that From the standpoint of making the recess 5 as deep as possible and making it easier to grip the handle 3, it is preferable that the gap 7 does not exist, but even if there is a slight gap 7 (for example, about 1 to 2 inches), it will not be particularly large. There are no negative effects.

FIG. 4 shows a third embodiment of the container manufactured by the method of the present invention, in which the panel portion 4 is located on one side of the surface connecting the center lines of the handle 3 and the container main portion 2. Therefore, the recessed portion 5 is formed almost only on one side (wall portion 4a, side) of the tunnel portion 4, and on the opposite side (wall portion 4a, side).
The side) is slightly concave and not too K. Further, the opposing wall portions 4a1 and 4a2 of the panel portion are in close contact with each other. In this case, the concave portion 5 is deeper than the embodiments shown in FIGS. 2 and 3, so it is easier to grasp, especially with the left hand. It should be noted that if the configuration is the same as that in FIG. 4, but the only difference is that the recess 5 is provided above the figure, it can be made easier to hold with the right hand.

(Example) The method for manufacturing the container of the first aspect of the present invention shown in FIGS. 1 and 2 will be described below using an example of ethylene terephthalate, which is a typical polyester resin.

(Mold Configuration) FIG. 5 shows the inner surface of the biaxial stretch blow molding mold 8 used to manufacture the container of the first aspect of the present invention, and the mold 8 has a neck. Mold 9, silk 10 and bottom mold 11
It's getting better. Silk 1° is made of two half-split molds, 1
2 indicates a cavity, and 13 indicates a surface where the half molds should come into contact with each other. 9a.

10a and lla are for keeping the neck mold 9, most of the silk 10, and the inner surface of the bottom surface 11 (cavity wall surface) at a temperature lower than the glass transition point (approximately 80'C) of polyethylene terephthalate after stretching. The figure shows the cooling holes through which the cooling water passes.

A pair of opposing pressing members 14 is provided at a position of the silk 1o corresponding to the panel portion 4 of the container 1.
4 is a drive mechanism not shown (for example, a pneumatic cylinder)
Therefore, the sleeve 1 is placed in the direction perpendicular to the contact surface 13 of the half-split side mold.
5 and G allow for reciprocating movement (Figure 6). The sleeve 15 and the main body 10 made of silk are separated by a heat-resistant heat insulating sheet 16 (for example, a fluororesin sheet). Heating bodies 18 and 19 are built into the pressing member 14 and the sleeve 15, respectively, and the pressing surface (end surface) 14a of the pressing member 14
(It has the same shape as the wall surface of the corresponding panel part 4, and the opposing pressing surfaces have shapes corresponding to each other; in the case of FIG. 6, they are mutually square planes) and the inner surface 15a of the sleeve 15 has a biaxial The temperature is maintained at a temperature higher than the glass transition point of polyethylene terephthalate after stretch blow molding and preferably lower than the recrystallization start temperature. Note that the holding temperature may exceed the recrystallization start temperature within a range in which whitening does not occur.

As is clear from FIG. 6, the inner surface 10b of the barrel mold.

It is preferable that the inner surface 16a of the heat insulating sheet, the sleeve inner surface 15&, and the pressing surface 14m form a continuous surface with no step difference during biaxial stretch blow molding. This is to ensure that the outer surface of the container 1 is as smooth as possible. 17 is a biaxially stretched blow-molded body, 17a is a wall portion corresponding to the wall portion 2a of the main portion of the container 1, and 17b is a wall portion 3 of the handle.
This wall portion corresponds to point a, has a roughly semicircular cross section, and is in contact with the inner surface 10b of the barrel. An intermediate wall portion 17c, which is parallel in cross section between the walls 17a and 17b (however, the wall 17a side is slightly widened) is in contact with the inner surface of the sleeve 15a and the pressing surface 14a.

That is, the cavity 12 is defined by a cavity main portion having a shape corresponding to the container main portion and a surface corresponding to the outer end surface of the handle 3, and is a handle in which a tongue-shaped portion is formed with a diameter and thickness of the hollow portion approximately equal. 3 and the cavity tail portion corresponding to panel portion 4 are different.

Immediately after forming, the walls 17a and 17b of the molded body 17 are rapidly cooled by the inner surface 10b of the body mold, and have a temperature lower than the glass transition point, making them difficult to deform, while the intermediate wall 17c is maintained at a temperature higher than the glass transition point. It is deformable because it is

(Function) Using the mold 11 described above, the container 1 of the first embodiment is manufactured as follows.

First, an injection-molded bottomed I-lye ethylene terephthalate parison (not shown) heated to a temperature above the glass transition point and below the recrystallization initiation temperature, preferably about 90-110°C, is heated to It is charged into a mold and its neck is held by a neck mold 9.

At this time, the pressing surface 14 made of silk should be in contact with the intermediate wall portion 17c.
a and the inner surface of the sleeve 15a are kept at a temperature above the glass transition point (approximately 80° C.) of polyethylene terephthalate after stretching, preferably lower than its recrystallization start temperature, while the other inner surface of the mold is Transition point (approximately 80℃
) Keep it at a very low temperature. Thereafter, a stretching rod (not shown) is press-fitted and biaxial stretching blow molding is performed in a conventional manner to form a molded body 17. Intermediate wall portion 17 of molded body 17
When the body wall parts 17a and 17b other than c become lower than the glass transition point (approximately 80°C) due to contact with the inner surface 10b made of silk, each of the opposing pressing members 14 is immediately made of silk. As shown in FIG.
form. At that time, a portion 17c'' of the intermediate wall portion that is to become the main part of the container and a portion 17 of the side that is to be the handle.
Since the portion e"' is also at a temperature above the glass transition point, it is easily deformed, while the other body wall portions 17a.

17b is at a temperature lower than the glass transition point and therefore does not deform, so that the container main portion 2 and handle 3 are defined around the portion that is to become the /4” flannel portion 4, as shown in FIG.

Then, the pressing member 14 may be returned to its original position (it may be returned to its original position), the mold 8 is opened, and the molded body 17' in which the nozzle portion 4 is formed is taken out. The molded body 17' becomes the container 1 shown in FIG.

The container 1 of the embodiment shown in FIG. 3 is manufactured by stopping the pressing member 14 at a position where a slight gap (equal to the gap 7) is created between the inner surfaces of the intermediate wall portion 17C' when the pressing member 14 is inserted. be able to.

Furthermore, in the container 1 of the embodiment shown in FIG. 4, among the opposing pressing members 14, the pushing amount of the lower pressing member 14 (in FIG. 6) is increased, and the pushing amount of the upper pressing member 14 is reduced to just /JS. By doing so, it can be manufactured in the same manner as the embodiment shown in FIG.

Although the case where polyethylene terephthalate is used has been described above, containers made of other saturated polyester resins can be manufactured in substantially the same manner except that the heating or cooling temperature is different.

Note that one side of the pressing surface (end surface) 14a of the pressing member 14 is pressed into a slightly protruding curved surface, and the other is pressed into a slightly concave curved surface corresponding to the former.

The flannel portion 4 may be formed into a curved shape.

(Effects of the Invention) According to the present invention, a stretched polyester container with a handle can be manufactured by one biaxial stretch blow molding process, so that a handle-equipped polyester container with a handle can be manufactured by one biaxial stretch blow molding process. Compared to containers with attached containers, the process is simpler and the quality is more stable.

Furthermore, since the handle is connected to the main part of the container through the panel, no hole is formed in the handle, and no joints such as heat-sealed parts are formed on the wall of one handle. This has the effect of preventing leakage of the liquid content and intrusion of outside air.

[Brief explanation of the drawing]

Figure 1 is a front view of a container manufactured by the method of the present invention, Figure 2 is a front view of a container manufactured by the method of the invention;
The figure is a cross-sectional view taken along the line ■--■ in FIG. −■ A cross-sectional view along the line,
FIG. 4 is a cross-sectional view taken along the line ■-■ of FIG. 1; Drawings showing the main parts of the container of the third embodiment, FIG. FIG. 7 is a cross-sectional view taken along the line ■-■ in the figure, showing the state immediately after biaxial stretch blow molding; FIG. 7 is a cross-sectional view of the mold after the molding shown in FIG. FIG. 1... Biaxially stretched blown polyester container with handle, 2...
・Container main part, 2a...Wall part, 3...Handle, 3a...
・Wall part, 4...Panel part, 4a+ 4aI) 4
a2...Wall portion, 6...Hollow portion, 14...Press member, 14a...Press surface (end surface). C Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 61!1

Claims (1)

[Claims] (1) A handle having a hollow part that communicates with the main part of the container,
A method for manufacturing a biaxially stretched blown polyester container with a handle, in which the handle and the container main portion are connected by a panel portion consisting of opposing and close wall portions of the container, the container having a shape corresponding to the container main portion. A cavity portion corresponding to the handle and the panel portion is defined by a main cavity portion of the handle and a surface corresponding to the outer end surface of the handle, and is formed into a tongue-shaped portion having a diameter and thickness approximately equal to the diameter of the hollow portion. The wall surface of the portion of the tongue portion corresponding to the panel portion is formed by using a mold formed by the end surface of the pressing member having opposing end surfaces with mutually corresponding shapes. The wall surface of the tongue portion and the wall surface of a portion of the tongue portion corresponding to the outer end surface of the handle are maintained at a temperature lower than the glass transition point of the polyester, and the panel portion of the tongue portion and its peripheral portion are maintained at a temperature lower than the glass transition point of the polyester. biaxially stretch blow molding a polyester bottomed parison to form a preform while the temperature is maintained at a temperature above the point;
A method for manufacturing a biaxially stretched blown polyester container with a handle, characterized in that the pressing members are immediately brought close to each other to form the panel portion.