JPS649237B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a saturated polyester resin 2 for storing high-temperature contents such as milk and juice.
This relates to a method of injecting and filling high-temperature liquid contents into an axially stretched bottle.More specifically, the flange provided on the outer peripheral surface of the neck of the bottle body is heated by the heat of the liquid content. The purpose is to prevent deformation during filling with liquid.

[Conventional technology]

Biaxially stretched blow molded bottles made of saturated polyester resin have come to be used in many wide fields due to their excellent physical properties and characteristics. A significant drawback of the body is its low heat resistance.

Not only this biaxial stretch blow-molded bottle made of saturated polyester resin, but also products made of other synthetic resin materials generally have low heat resistance, but there is a method called "heat setting" to increase this heat resistance. However, the improvement in heat resistance due to this heat setting was not very large.

For example, in the case of a biaxially stretched blow-molded bottle made of saturated polyester resin, its heat resistance is only up to about 80 degrees Celsius even if it is heat set, so it can be used for products such as milk and juice, which have the highest demand. It could not be used as a storage container for the liquid contents that had been subjected to high-temperature treatment (for sterilization).

As a method of filling high-temperature contents into this biaxially stretched blow-molded bottle made of saturated polyester resin, this type of contents needs to be at a high temperature only during filling, and after being filled and stored, Focusing on the fact that room temperature or cooling is required, a method of forcibly cooling the bottle during injection and filling of the high-temperature contents has demonstrated excellent effects.

In this liquid filling method, the bottle is forcibly kept cooled by a cooling fluid so that the temperature of the bottle does not increase due to heat from the high temperature liquid.

When carrying out this method, even during the filling operation with high-temperature contents, the cooling fluid must be sprayed onto the bottle surface or flowed down, so this cooling fluid must enter the open mouth of the bottle. Therefore, in order to prevent this cooling fluid from entering the bottle, a shielding plate that shields the bottle mouth from the body side of the bottle is installed on the outer peripheral surface of the bottle mouth, or more precisely, on the outer peripheral surface of the bottle mouth. Attach to the outer peripheral surface of the neck, which is the lower end of the mouth.

Since this shielding plate prevents the cooling fluid from entering from the body side to the mouth side, it is necessary to bring its leading edge into pressure contact with the bottle mouth.

However, although the outer circumferential surface of the mouth where the shielding plate of the bottle comes into pressure contact is cooled by the cooling fluid, it is a place where the heat from the high-temperature content liquid acts strongly, so this pressing force There is a risk that the mouth may become deformed.

Then, when shielding the trunk side and the mouth side with a shielding plate, as shown in FIGS. 1 and 4,
The leading edge of the shielding plate 5 was brought into contact with the flange provided on the outer circumferential surface of the neck from below.

In this way, the flange 3 for retaining the tightening force of the screw cap (in the case of the embodiment shown in FIG. 1) or the lower surface of the flange 3 for assembling the caulking cap (in the case of the embodiment shown in FIG. 4) By bringing the leading edge of the shielding plate 5 into contact with the opening 2, no external pressing force is applied to the opening 2, which is subject to a large thermal effect from the high-temperature content liquid. The occurrence of deformation of the portion 2 is reliably prevented.

[Problem that the invention seeks to solve]

However, when the high-temperature content liquid is actually injected and filled in the state shown in FIGS. 1 and 4, the flange 3 becomes as shown in FIG. 2 and as shown in the dotted line in FIG. As shown in the figure, deformation was confirmed.

As a result of various investigations into the causes of thermal deformation of the flange 3, we found that
It was found that this is because the lower surface of the collar portion 3 is an inclined surface that descends as it approaches the mouth portion 2.

This is because when the shielding plate 5 is assembled to the mouth part 2, the tip edge of the shielding plate 5 comes into contact with the lower surface of the flange 3. A pushing force will be applied to 1.

The pushing up force acting on the flange 3 is not a problem since it is at most the weight of the bottle 1 before it is filled with the liquid, but as the liquid is filled into the bottle 1, The weight of the liquid injected into the bottle 1 is also added, and therefore, as the liquid fills into the bottle 1, the pushing up force acting on the flange 3 is extremely strong. Become something.

Due to such a strong push-up force and the heat action from the high-temperature content liquid, the collar portion 3 is deformed so as to displace its circumferential tip upward.

The disadvantage of this conventional example is that, as mentioned above, the lower surface of the flange 3, which the leading edge of the shielding plate 5 comes into contact with, is sloped, so the leading edge of the shielding plate 5 comes into line contact with the lower surface of the flange 3, and this shielding The push-up force acting on the flange 3 from the plate 5 acts concentratedly on this contact line (point), which causes the flange 3 to be incorrectly deformed.

Of course, if it is possible to bring the leading edge of the shielding plate 5 into accurate contact with the base end of the lower surface of the flange 3,
Although the above-mentioned inconvenience will not occur,
Since the bottle 1 inevitably has variations in molding dimensions, depending on the bottle 1, when the shielding plate is assembled,
The leading edge of the shielding plate may come into strong contact with the lower surface of the flange 3, resulting in a state in which a pushing force is applied to the flange 3.

The present invention was devised to solve the problems and inconveniences in the conventional examples described above, and when the shielding plate is assembled to the bottle body, the leading edge of the shielding plate does not come into strong contact with the lower surface of the flange. The technical problem is to make the contact between the upper surface of the leading edge of the shielding plate and the lower surface of the flange a surface contact that does not apply any pushing up force.

[Means and actions for solving problems]

The means according to the present invention allows the content liquid that has been heat-treated at a high temperature to be placed in a biaxially stretched bottle body 1 made of a saturated polyester resin and placed in an upright position.
The bottle is injected and filled while being cooled by a cooling fluid C. In order to prevent the cooling fluid C from entering the mouth 2 side of the bottle body 1, a shielding plate is attached to the neck of the bottle body 1 from the lateral direction through an assembly hole. 5, the shield plate 5 is assembled to the bottle body 1 by bringing the upper surface of the hole line of the assembly hole into surface contact with the lower surface of the flange 3 without applying any pushing up force.

That is, since the lower surface of the collar 3 is placed in an upright position without being inclined with respect to the outer circumferential surface of the neck, the shielding plate 5 that is attached to the neck from the lateral direction parallel to the lower surface of the collar 3 can be attached to the neck from the side. 3 does not change the assembled posture with respect to the lower surface of the shield plate 5, and as a result, as the shield plate 5 is assembled to the neck portion, the pushing up force acting on the collar portion 3 increases as the shield plate 5 is assembled to the neck portion. This can prevent such a phenomenon from occurring.

As shown in FIGS. 3 and 5, by setting the assembly height position of the shielding plate 5 with respect to the bottle body 1 placed upright, the lower surface of the flange 3 becomes a horizontal flat surface. Therefore, the assembly hole edge of the shielding plate 5 that is assembled to the mouth part 2 to prevent the cooling fluid C for cooling the bottle body 1 from entering from the body side to the mouth part 2 side is located at the flange part 3. The shielding plate 5 comes into light surface contact with the lower surface of the bottle, and no upward force is applied to the bottle body 1 from the shielding plate 5 via the flange 3.

Therefore, when the high-temperature content liquid begins to be filled into the bottle body 1 through the injection tube 4, the mouth part 2 including the flange part 3 is heated by the heat of the injected content liquid, so that the bottle body 1 is slightly heated by the heat of the injected content liquid. Even if the flange 3 were to soften, the flange 3 will not be thermally deformed and the liquid content will remain intact because no external force, including upward force, is acting on the flange 3. It will maintain its shape before injection.

Note that if the assembled height positional relationship of the shielding plate 5 to the bottle body 1 is such that a large pushing force is applied from the shielding plate 5 to the flange 3, If the molding dimensional error of the body part 1 is greater than the allowable value and the height dimension of this body part is insufficient, the assembly of the shielding plate 5 to the bottle body 1 itself cannot be achieved, and such The bottle body 1 is rejected as a defective product without being injected with high-temperature content liquid.

As described above, according to the method of the present invention, the collar portion 3 is
Since it is not thermally deformed by the heat of the high-temperature content liquid, various inconveniences caused by thermal deformation of the flange 3, such as the tightening limit of the screw cap being out of order, and the crimping of the crimping cap can be achieved satisfactorily. This eliminates the possibility of inconveniences such as the sealing force of the mouth part 2 being deteriorated by the cap.

[Example] Fig. 3 shows a case in which a flange 3 is provided around the lower end of the outer circumferential surface of the opening 2 around which a thread is provided for tightening a screw cap, and the lower surface of the flange 3 is a flat surface. However, the upper surface is a conventionally inclined surface to prevent the mechanical strength of the flange 3 from decreasing.

The embodiment shown in FIG. 5 shows a case in which the present invention is applied to a flange 3 for a crimped cap.

〔Effect of the invention〕

As is clear from the above description, the present invention provides a flange 3 that is protrudingly provided on the outer peripheral surface of the neck, which is the lower end of the mouth 2.
The lower surface is a horizontal flat surface, and the shielding plate is assembled by bringing the upper surface of the hole edge of the assembly hole into surface contact with the bottle main body which is placed upright without applying any upward force to the lower surface of the flange. Since I attached it, the bottle body 1
Regardless of whether or not the liquid is injected into the bottle, there is no upward force acting on the flange 3 from the shielding plate 5, and as a result, the opening of the bottle is affected by the temperature of the liquid filled. Since it is possible to reliably prevent thermal deformation, it is possible to improve the mechanical stability of the biaxially stretched bottle made of saturated polyester resin as a container for filling and storing high-temperature contents, and also to improve the mechanical stability of the bottle as a container. It has many excellent effects such as being able to smoothly fill the liquid into the container.

[Brief explanation of drawings]

Fig. 1 shows a state in which high-temperature liquid is being filled into a biaxially stretched and molded bottle made of saturated polyester resin, and is a vertical sectional view of main parts showing the filling operation into a bottle of a conventional structure. . FIG. 2 is a partial sectional view showing a deformed state of the flange of the conventional bottle shown in FIG. 1. FIG. FIG. 3 is a partially sectional view showing one embodiment of the present invention. FIG. 4 is a partial sectional view showing another conventional example. In FIG. 4, the dotted line indicates the thermally deformed shape of the flange. Figure 5 shows
FIG. 5 is a vertical cross-sectional view of a main part showing another embodiment corresponding to the flange of the structure shown in FIG. 4; Explanation of symbols: 1; bottle body; 2; mouth; 3; flange; 4; injection tube; 5; shielding plate; C; cooling fluid.

Claims (1)

[Claims] 1. When injecting and filling the high-temperature heat-treated liquid content into a saturated polyester resin biaxially stretched bottle body placed in an upright position while cooling the bottle body with a cooling fluid, In order to prevent the cooling fluid from entering the mouth side of the bottle body, the lower surface of the flange provided on the outer peripheral surface of the neck between the body and the mouth is a horizontal flat surface, A shielding plate that is laterally assembled to the neck of the bottle body through an assembly hole is brought into surface contact with the upper surface of the hole edge of the assembly hole of the shielding plate without applying a pushing force to the lower surface of the flange. and a method for filling a high-temperature liquid content into a biaxially stretched saturated polyester resin bottle which is assembled into the bottle body.