JPH09277359A - Molding of handled bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mold a handled bottle not generating cloudiness in the vicinity of its handle attaching part and having transparency and a gloss feeling. SOLUTION: A blow mold 1 is divided into a handle attaching part mold 2 corresponding to the vicinity of a handle fitting part, a body mold 3 other than the mold 2 and a bottom mold 4 and the respective molds are regulated to individual predetermined temps. and, after blow molding, blow pressure is held to closely bring the wall of a bottle main body into contact with the molding surfaces of the respective molds to subject the same to heat treatment to mold a handled bottle. By this constitution, since the respective parts different in shape can be subjected to the heat treatment at the respective optimum temps., the bottle generating no post-shrinkage or cloudiness can be molded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a bottle with a handle for filling a liquid in a high temperature state such as sake or noodle soup.

[0002]

2. Description of the Related Art Heat-resistant synthetic resin bottles filled with high-temperature liquids such as fruit juice and mineral water are known.
As a manufacturing method thereof, there is a method in which a preform is blow-molded in a mold heated to a high temperature, and the preform is brought into close contact with the mold for a few seconds for heat treatment.

A synthetic resin bottle with a preformed handle is also known. As a method for producing the same, a mold provided with a portion for arranging the preformed handle is used, and a high pressure is applied in the preform. Blow air is blown along the inner surface of the mold to mold the bottle, and the preform wall is wrapped around the fitting part of the handle to attach the handle, and the bottom mold is pulled down to the bottom of the bottle. A method is known in which the bottle is opened laterally and the bottle is taken out.

[0004]

In order to mold a bottle with a handle by this conventional method, the mold temperature is adjusted and blow molding is performed, and the mold is brought into close contact with the mold for several seconds to be cooled and solidified, heated, or the like. Then, the heat treatment is performed. However, if the temperature of the whole body mold is lowered and solidified by cooling, the vicinity of the handle mounting portion will be post-contracted due to insufficient cooling, while if the temperature of the whole body mold is raised, the handle mounting portion will become cloudy. There is a problem that the appearance may be seriously impaired.

According to the present invention, even if the temperature of the mold is lowered to be solidified by cooling, no post-shrinkage occurs in the vicinity of the mounting portion of the handle, and in order to impart heat resistance, the mold temperature is raised and the mold is kept for several seconds. When heat-treated with close contact, there is no cloudiness around the handle attachment part,
It is intended to provide a method for molding a bottle having transparency and gloss.

[0006]

According to the method of molding a bottle with a handle of the present invention, a handle is mounted in advance so that the fitting portion thereof protrudes inside a blow molding die, and a preform heated to a molding temperature is used. At the same time as the blow molding, the wall of the bottle main body is wrapped around the fitting portion, and in the method of molding a bottle with a handle, a blow molding die, at least a handle mounting portion mold corresponding to the vicinity of the fitting portion of the handle, It is divided into the other body mold and the bottom mold, and each mold is temperature-controlled to a predetermined temperature individually, and after blow molding, keep the blow pressure to bring the wall of the bottle body into close contact with each mold surface. It is characterized by heat treatment.

As a result, the handle mounting portion, the body portion, and the bottom portion can be individually heat-treated at the optimum temperature even though they have different degrees of stretching and different shapes.
It is possible to mold bottles with handles without post-shrinkage or cloudiness.

Further, a preform heated to 70 ° C. or higher and 130 ° C. or lower is biaxially stretch blow molded in a mold having a handle having a fitting portion previously inserted, and the wall of the preform is wound around the fitting portion. In the method of making a bottle with a handle, at least the handle attachment part mold is set to 120 ° C. or lower,
The temperature of the other body molds is set to 80 ° C or higher and 200 ° C or lower, and the temperature of the bottom mold is set to 50 ° C or higher and 150 ° C or lower,
After blow molding the bottle body, heat it by making it adhere to the mold for several seconds, blow air is exhausted, and a cooling medium of 20-40 Kg / cm ² is sent into the bottle body through the hole formed in the hollow rod, Can be taken out by cooling from the inside.

When molding a bottle with a handle that does not require much heat resistance, a preform heated to 70 ° C or higher and 130 ° C or lower is biaxially stretched in a mold in which a handle having a fitting portion is inserted in advance. When blow molding is performed to wind the wall of the preform around the fitting part to form a bottle with a handle, at least the handle mounting part mold is set to 10 ° C. or higher and 30 ° C. or lower, and the temperature of other body molds is set to 60 ° C. or higher 90 ℃ or less,
Keep the temperature of the bottom mold at 10 ℃ or more and 50 ℃ or less,
It is also possible to blow-mold the bottle body, bring it into close contact with the mold for a few seconds, cool it, and then exhaust the blow air to take it out. In this way, the attachment part of the handle is sufficiently cooled without using a cooling medium, so that there is no post-shrinkage in this part, the capacity varies, and the handle and its attachment part It is possible to form a bottle with a handle that has an excellent appearance without making it difficult to insert your hand between the two.

In this case, if the handle mounting die is less than 10 ° C., the moldability deteriorates, and if it exceeds 30 ° C., post-shrinkage occurs.
Further, when the temperature of the barrel die is less than 60 ° C., the natural shrinkage becomes large, and when it exceeds 90 ° C., it is deformed at the time of molding. Therefore, the temperature range is preferably set as described above.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings, taking heat treatment as an example. FIG.
In the figure, the mold 1 used in the present invention and its cooling circuit are shown. As shown in FIGS. 1 and 2, the handle mounting portion mold 2 is divided into parts of the body mold 3 other than the handle mounting part mold 2 so as to adjust the temperature, and the portion contacting the body mold 3 is several mm. The gap is open and it is insulated.

Further, the grip attachment part mold 2 is divided from the body mold 3 to form a nesting system. The material may be the same as that of the barrel die 3, but a material having a smaller thermal conductivity than the material of the barrel die 3 is more preferable.

If the temperature of the handle mounting die 2 exceeds 120 ° C., the handle may become cloudy. If the temperature of the barrel die 3 is lower than 80 ° C., heat resistance is not imparted to the barrel portion of the molded bottle, and deformation occurs during high temperature filling. On the other hand, when the temperature exceeds 200 ° C., a winding failure occurs at the fitting portion of the handle and a large amount of cloudiness occurs around this. Further, when the temperature of the bottom mold 4 is less than 50 ° C, the heat resistance of the bottom portion of the obtained bottle is poor, and when it exceeds 150 ° C, it is deformed during molding.

The molds 1 are kept warm by hot water pipes or the like (not shown) provided inside the molds 1, and the molded bottles are contacted with each other for 2 to 10 seconds, particularly preferably 4 to 8 seconds to perform heat treatment, It is designed to improve heat resistance. The shape of the bottom mold 4 has an uneven rib shape. As a result, the bottom of the obtained bottle 5 with a handle is provided with uneven ribs corresponding to the uneven rib shape to improve the strength and prevent deformation during filling.

A bottle 5 with a handle is molded by the mold 1 by the following method. The preform heated to 70 ° C. or higher and 130 ° C. or lower is biaxially stretch blow molded in the mold 1 in which the handle 6 having the fitting portion is mounted in advance, and the wall of the preform is wound around the fitting portion of the handle. 5 bottles with handles
When setting the temperature of the mold 3 of the mold 1 to 80 ° C. or higher, 20
0 ℃ or less, 120 at least only handle mounting part mold 2
The temperature of the bottom mold 4 is kept at 50 ° C. or more and 150 ° C. or less while being cooled to not more than 80 ° C., preferably 80 ° C. or more and 110 ° C. or less. Then, blow air is blown to blow-mold the bottle body 7, and the bottle body 7 is brought into close contact with the die 1 for a few seconds to be heat-treated, and then the blow air is exhausted, and a hollow (not shown) inserted into the bottle from the plug portion 8 of the bottle body 7. 20-40kg / cm ² through the hole formed around the drawing rod of
The cooling medium is sent into the bottle 5, cooled from the inner surface, and the bottle 5 is taken out.

The preform is preferably polyester such as polyethylene terephthalate because it improves heat resistance by heating. Preform is 70 ℃ or higher in advance 130
It is necessary to heat in the stretching temperature range of ℃ or less. Further, it is preferable that at least the vicinity of the top surface of the plug portion, preferably the neck ring portion of this preform is heated to be crystallized to be whitened.

Although not shown, cooling after blow molding and heat treatment is carried out by inserting a hollow stretch rod into the bottle 5 through the spout portion 8. First, blow air is exhausted and the hollow stretch rod is cooled. 20-4 through the formed hole
A high-pressure cooling medium of 0 kg / cm ² , for example, a gas such as air is fed to cool the bottle body from the inner surface.

The method of cooling the mounting portion of the handle 6 more than the other body portion 7 is to use the mold 1 as shown in FIGS. 1 and 2 described above so that only the handle mounting portion mold 2 can be divided and cooled. It is something to do. The handle attachment mold 2 may be made of the same material as the body mold 3, but preferably has a smaller thermal conductivity than the body mold 3. Further, in order to enhance the heat insulating effect, it is more preferable to provide a gap of several mm in the contact portion with the barrel die 3.

[0019]

[Example] The preform heating temperature 1 for the bottle 5 with a handle molded by the method of the present invention as described above
00 ℃, bottom mold temperature 100 ℃, blow air pressure 30kg
/ cm ² , blow holding time 5 seconds, cooling medium pressure 30 kg / c
m ² , cooling medium feed time was 7 seconds, and the temperature of the barrel was 6
0 ℃, 140 ℃, the temperature of the handle mounting part mold, 60 ℃ ~ 14
The temperature was changed between 0 ° C. as shown in Table 1, and the haze value and appearance of the grip attachment part were evaluated.

[0020]

[Table 1]

As is apparent from Table 1, the haze value of the attachment portion of the handle 6 was 20% or less, and the original transparency and glossiness of PET were not lost. Further, in the filling experiment of the high temperature liquid, Comparative Example 4 was deformed, but Experimental Examples 1 and 2 were not deformed and heat resistance was imparted.

[0022]

According to the present invention, the handle mounting portion, the body portion and the bottom portion can be individually heat-treated at the optimum temperature even though they have different stretching degrees and shapes.
It is possible to mold bottles with handles without post-shrinkage or cloudiness. In addition, the fitting portion of the handle is not deformed and the mounting strength is not reduced, and the heat resistance of the entire body of the bottle is improved, and a transparent and glossy bottle can be formed. If the bottom of the bottle has an uneven rib structure, the bottom is strengthened and heat resistance can be improved.

[Brief description of drawings]

FIG. 1 is a schematic front view of a mold cooling circuit according to the present invention.

2A and 2B schematically show a cooling circuit of a mold for attaching a grip according to the present invention, in which FIG. 2A is a partial front view thereof, FIG. 2B is a partial left side view thereof, and FIG. -II is a sectional view taken along line II.

FIG. 3 shows a bottle with a handle manufactured according to the present invention,
(A) is the front view, (B) is the right side view, (C) is the III-III sectional view taken on the line of A.

[Explanation of symbols]

 1 Mold 2 Handle attachment part type 3 Body type 4 Bottom type 5 Bottle 6 Handle 7 Bottle body 8 Plug part

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location B29C 71/02 B29C 71/02 B65D 23/10 B65D 23/10 A 25/28 103 25/28 103B // B29L 22:00

Claims (2)

[Claims] 1. A handle is mounted in advance so that its fitting portion projects inside a blow mold, and a preform heated to a molding temperature is blow-molded, and at the same time, the wall of the bottle body is fitted to the fitting portion. In a method of forming a bottle with a handle by winding, a blow mold is divided into at least a handle attaching part mold corresponding to the vicinity of a fitting part of the handle, a body mold other than that, and a bottom mold, A method for forming a bottle with a handle, characterized in that the temperature of each mold is individually adjusted to a predetermined temperature, and after the blow molding, the wall of the bottle main body is brought into close contact with each mold surface while maintaining the blow pressure for heat treatment. . 2. A preform heated to 70 ° C. or higher and 130 ° C. or lower is biaxially stretch blow-molded in a mold having a handle having a fitting portion in advance, and a wall of the preform is wound around the fitting portion. In the method of making a bottle with a handle, the temperature of the handle mounting part mold is set to 120 ° C. or lower, the temperature of the other body molds is set to 80 ° C. to 200 ° C., and the temperature of the bottom mold is set to 50 ° C. to 150 ° C. At the same time, the bottle body is blow-molded, heat-treated by closely contacting it with the mold for several seconds, and then blow air is exhausted and a cooling medium of 20 to 40 kg / cm ² is sent into the bottle body through the hole formed in the hollow rod. The method for forming a bottle with a handle according to claim 1, wherein the bottle is cooled from the inside and taken out.