JPH08198268A - Handle-equipped polyester bottle - Google Patents

Abstract

PURPOSE: To provide a handle-equipped polyester bottle that is highly excellent in heat resistance while being available for keeping transparency, without allowing opaqueness to happen, on the bottle wall constituting a recessed part for fitting the handle therein, and also excellent in presenting lucid appearances. CONSTITUTION: In a handle-equipped polyester bottle, a recessed part 2 for fitting a handle therein is formed at the lateral on the upper part of the bottle main body, and the handle 3 is attached to the inside of the recessed part 2. Average refractive index at the bottle wall constituting the recessed part 2 for fitting the handle therein is set at 1.590-1.610, and the degree of planar orientation (ΔP) for the bottle wall constituting the recessed part 2 for fitting the handle therein is set higher than 0.03.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handle-equipped polyester bottle in which a handle mounting recess is formed on the upper side surface of a bottle body and the handle is mounted in the recess, and more particularly to a polyester bottle with a handle having excellent heat resistance. .

[0002]

2. Description of the Related Art Conventionally, as a polyester bottle with a handle, a bottle having a handle mounting recess formed on the upper side surface of the bottle and having the handle mounted in the recess is often used. In order to store mineral water and the like, a method of improving heat resistance by heat-treating in a heated blow mold has been studied.

[0003]

However, when the conventional polyester bottle with a handle is heat-treated in a blow mold heated to a high temperature, the bottle wall forming the handle mounting recess formed on the upper side surface of the bottle is In particular, it has a drawback that the heat resistance cannot be improved so much because it becomes cloudy over the handle mounting portion, the periphery thereof and the inner portion thereof to impair the appearance of the bottle.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to obtain a polyester bottle with a handle excellent in heat resistance. A handle mounting recess is formed on the upper side surface of the bottle body, and the handle is held in the recess. In the attached polyester bottle with a handle, the average refractive index of the bottle wall forming the handle attaching recess is 1.590 to 1.610, and the plane orientation of the bottle wall forming the handle attaching recess. (ΔP) is 0.0
It is a polyester bottle with a handle that is larger than 3.

According to the present invention, the average refractive index of the bottle wall forming the handle mounting recess is 1.590 to 1.61.
It is adjusted to a specific range of 0, and the plane orientation degree (ΔP) is 0.
By setting the specific level to be greater than 03, it has excellent heat resistance, but the bottle wall that makes up the handle mounting recess does not become cloudy and maintains transparency, resulting in an excellent appearance. A polyester bottle with a handle was obtained.

The present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front view showing an example of the polyester bottle with a handle of the present invention, and FIG. 2 is a sectional front view showing a method for producing the polyester bottle with a handle of the present invention.

The present invention, as shown in FIG.
A polyester bottle with a handle in which a handle mounting recess 2 is formed on the upper side surface of the container, and a handle 3 is mounted in the recess 2, and the average refractive index of the bottle wall constituting the handle mounting recess 2 is 1.590. Polyester bottle with handle, wherein the degree of surface orientation (ΔP) of the bottle wall forming the handle mounting recess 2 is larger than 0.03.

If the average refractive index of the bottle wall constituting the handle mounting recess 2 is smaller than 1.590, the heat resistance of the bottle becomes insufficient, while if it is larger than 1.610, the surface gloss of the bottle decreases. And the appearance becomes poor.

It is preferable that the average refractive index of the bottle wall forming the handle mounting recess 2 is larger than 1.595 because deformation does not occur even if hot water at 80 ° C. is filled.

Further, it is preferable that the average refractive index of the bottle wall constituting the handle mounting recess 2 is smaller than 1.605 because a polyester bottle with a handle having a precise shape can be obtained even if the cooling time after the heat treatment is short. .

When the average refractive index of the bottle wall forming the handle mounting recess 2 is 1.590 to 1.610, the plane orientation degree (Δ) of the bottle wall forming the handle mounting recess 2 is
When P) is 0.03 or less, the bottle wall forming the handle mounting recess 2 becomes cloudy. Further, the larger the degree of plane orientation (ΔP), the more the transparency is improved, but the attachment strength of the handle 3 tends to be deteriorated. Therefore, it is preferable to set it smaller than 0.15.

If the surface orientation degree (ΔP) of the bottle wall forming the handle mounting recess 2 is larger than 0.03, the mouth plug 11 and the bottom 120 of the preform 10 remain unstretched. Except for the spigot portion 11 and the bottom portion 12, the bottle wall of the portion other than the handle mounting recess 2 is also larger than 0.03.

In the case of a conventional polyester bottle with a handle,
At the time of stretch blow molding as shown in FIG. 2, the handle mounting portion 31
Since the extension of the mounting portion bottle wall 22 is restricted, it is difficult to orient, and since the inner bottle wall 21 of the handle mounting concave portion 2 is recessed inward, the distance from the preform 10 that bulges out during blow molding. However, the stretching ratio is short, and the bottle wall 22 of the mounting portion near the handle mounting portion 31 is in a low molecular orientation state, and it is considered that spherulites are formed and become cloudy when heated at high temperature.

The higher the temperature of the blow mold 4, the greater the coefficient of friction with the bottle wall, and the greater the tendency of the bottle wall constituting the handle mounting recess 2 to have a low molecular orientation and become cloudy.

Then, as a result of intensive studies by the present inventors, the average wall refractive index of the bottle wall forming the handle mounting recess 2 was adjusted to a specific range of 1.590 to 1.610, and the plane orientation degree (ΔP ) Is greater than a specific level of greater than 0.03, the bottle wall forming the handle mounting recess 2 does not become cloudy and maintains transparency while having extremely excellent heat resistance. It was possible to obtain a polyester bottle with a handle having an excellent appearance.

In order to manufacture the polyester bottle with a handle of the present invention, for example, as shown in FIG.
Bottle body 1 with a handle mounting recess 2 formed on the upper side surface of the bottle
Prepare a blow mold 4 having a mold surface shape corresponding to
A handle 3 previously formed by injection molding or the like is set on the mold surface corresponding to the handle mounting recess 2, and the blow mold 4 is heated to 120 to 200 ° C.

Then, for example, the preform 10 heated to a stretching temperature of 90 to 120 ° C. is set in the blow mold 4 and is stretched in the axial direction by a stretching rod 5 and blown with high pressure air in the radial direction. By stretching, the bottle body 1 is molded, and pressed against the heated inner surface of the blow molding die 4 for several seconds to several tens of seconds to perform heat treatment, and then cooled by circulating air inside the bottle. There is a method of taking out from the blow mold 4.

By heating the blow mold 4 at 120 to 200 ° C., the average refractive index of the wall of the bottle forming the handle mounting recess 2 can be set to 1.590 to 1.610, and it can be stretched. When the timing of shifting from the axial stretching by the rod 5 to the radial stretching by the high pressure air is delayed compared with the conventional method in which the temperature of the blow mold 4 is lower than 120 ° C., the bottle constituting the handle mounting recess 2 is formed. The degree of surface orientation (ΔP) of the wall can be made larger than 0.03, but is not limited to this method.

When the heat treatment is carried out to a condition that the average refractive index exceeds 1.610, the oligomer in the polyethylene terephthalate raw material is transferred to the inner surface of the blow mold 4 and the gloss of the entire bottle is lowered, so that the appearance is likely to be impaired.

[0021]

EXAMPLE Polyethylene terephthalate having an intrinsic viscosity of 0.84 was injection-molded, and the mouth plug portion 11 was heated and crystallized to be whitened. The thickness was 3.5 mm, the amount of resin was 60 g, and the intrinsic viscosity was 0.1.
The preform 10 of No. 76 is heated to about 110 ° C., set in the blow mold 4, stretch-blow molded, and then pressed for 5 seconds in the heated blow mold 4 to heat-treat, and then air is circulated in the bottle. Then, the mixture was cooled to obtain a bottle having an internal volume of 1.8 liters.

At this time, the handle 3 is set in advance in the blow molding die 4 so that the handle mounting portion 31 projects into the mold, and the handle mounting portion 31 is wrapped by the mounting portion bottle wall 22 simultaneously with blow molding. In this way, it was mounted in the handle mounting recess 2.

The heating temperature of the blow mold 4 was set to 65 ° C. in Experimental Example 1, 130 ° C. in Experimental Example 2, 150 ° C. in Experimental Examples 3 and 4, and 205 ° C. in Experimental Example 5. did. The temperature of the bottom mold part 41 was set to 100 ° C. in each of Experimental Examples 1 to 5.

The plane orientation degree (ΔP) of the handle mounting recess 2 is controlled by adjusting the timing of shifting from axial stretching by the stretching rod 5 to stretching in the radial direction by high pressure air during stretch blow molding. Experimental Example 1 is 0.072, Experimental Example 2 is 0.022, Experimental Example 3 is 0.009, Experimental Example 4
Was set to 0.035, and Experimental Example 5 was set to 0.080.

The average refractive index and the degree of plane orientation (ΔP) were measured with respect to the outer surface of the obtained polyester bottle with a handle by cutting out substantially the center of the inner bottle wall 21 of the handle mounting recess 2.

By means of an Abbe refractometer, the inner bottle wall 22-3
Direction (axial direction: AD, circumferential direction: HD, thickness direction: Th.
The refractive index of D), that is, three of NAD, NHD, and NTh.D are read, and the average value of the three is taken as the average refractive index, and ΔP obtained by the following formula is taken as the degree of plane orientation (ΔP). ,
It represents the degree of orientation of polyester molecules in the bottle wall surface.

The ΔP (NAD + NHD) /2-NTh.D white turbidity was visually observed by paying attention to the handle mounting recess 2, particularly the bottle wall 22 of the mounting portion, and was judged in three stages of transparent, slightly cloudy, and cloudy.

Regarding the heat resistance of the bottle, the obtained polyester bottle with a handle was filled with warm water at 80 ° C. and then allowed to cool, and there was no deformation anywhere in the bottle, and it was evaluated that there was any deformation. .

Regarding the appearance of the bottle, 40
0 polyester bottles with handles were produced, and the entire surface of the subsequent product was visually observed, and those with good gloss were judged to be good, and those with reduced gloss were judged to be defective.

[0030]

[Table 1] As is clear from Table 1, in Experimental Example 4, the average refractive index of the handle mounting recess 2 was 1.601, which was 1.590 to
Within the range of 1.610, the degree of plane orientation (ΔP) is 0.03.
It is 5 and exceeds 0.03, and all the characteristics are within the scope of the present invention, the handle mounting recess 2 is transparent without clouding, the bottle is not deformed, and it has excellent heat resistance. The appearance of the bottle is also good.

On the other hand, in Experimental Example 1, the average refractive index of the handle mounting recess 2 was 1.585, the bottle was deformed and the heat resistance was poor, and in Experimental Example 5, 1.613 was obtained.
The appearance of the bottle was poor.

Further, the degree of surface orientation of the handle mounting recess 2 (Δ
In Experimental Example 2 in which P) was 0.022 and Experimental example 3 in 0.009, cloudiness was found in the handle mounting recess 2.

[0033]

The polyester bottle with a handle of the present invention is
A polyester bottle with a handle, in which a handle mounting recess is formed on the upper side surface of the bottle body, and the handle is mounted in the recess, wherein the bottle wall constituting the handle mounting recess has an average refractive index of 1.590 to 1. .610, and the degree of surface orientation (ΔP) of the bottle wall forming the handle mounting recess is larger than 0.03, so that the handle mounting is achieved while having extremely excellent heat resistance. It was possible to obtain a polyester bottle with a handle, in which the wall of the bottle forming the recess for use does not become cloudy and the transparency is maintained, and the appearance is excellent in gloss.

[Brief description of drawings]

FIG. 1 is a sectional front view showing an example of a polyester bottle with a handle of the present invention.

FIG. 2 is a sectional front view illustrating a method for manufacturing a polyester bottle with a handle of the present invention.

[Explanation of symbols]

 1 Bottle body 2 Care recess 3 Handle

Claims (1)

[Claims] 1. A polyester bottle with a handle in which a handle mounting recess is formed on an upper side surface of a bottle body, and a handle is mounted in the recess, wherein an average refractive index of a bottle wall constituting the handle mounting recess is A polyester bottle with a handle having a degree of surface orientation (ΔP) of greater than 0.03, which is 1.590 to 1.610 and which constitutes the handle mounting recess.