JP2000158525A - Method and apparatus for crystallizing preform port for molding bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a difference in a port size even by molding performs of a crystallized port and a non-crystallized port in the same mold by heating the port of the preform for blow molding a plastic bottle, and crystallizing the preform in the state that an extending force is given to the port in an outer circumferential direction. SOLUTION: A preform P for molding a bottle is fixedly held in a container 3 of a heating pot 2. Then, the air in a container 3 is sucked from an air suction hole 4 at a bottom of a heating pot 2, and the perform P is sucked and held at the port 2. Then, an extending force(f) is given from an inner peripheral side of a preform port P3 in an outer circumferential direction heat(h) is given from the outer peripheral side of the port P3, and the port P3 is crystallized and a port side is regulated. Then, the port P3 is crystallized and solidified with air blowing (c) of ambient temperature or cold temperature. Thus, the port P3 and a threaded part of its outer periphery are crystallized to enhance its strength, and a size of the port P3 is set to a predetermined port size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for crystallizing a mouth of a preform for bottle molding, in which the mouth of a plastic bottle obtained by blow molding a preform is strengthened by crystallization treatment by heating. Related to the device.

[0002]

2. Description of the Related Art In general, a plastic bottle (commonly referred to as a PET bottle) made of polyethylene terephthalate is formed by a process shown in FIGS. 8 (a) to 8 (g). A pair of opposing neck dies 33, 33 having a semicircular shape are attached to a neck 32a of a core mold 32 (inner mold) mounted and supported on a support portion 31 of the core mold portion 30 by an arrow in the figure (the actual arrow direction is hereinafter referred to as arrow direction). (Up-down direction), and a mold 41a provided in the cavity 41 (outer die) of the cavity 40 for preform molding.
The core mold 32 is loaded therein as shown in (b), and a space 42 is formed between the core mold 32 and the mold part 41a.

[0003] Next, in (c), a molten resin (polyethylene terephthalate) is injected from an injection nozzle 41c into a space 42 between a core mold 32 and a mold 41a of a cavity 41 through a flow path 41b. By cooling the mold and solidifying the resin, a preform P having a body part P1, a bottom part P2, a mouth part P3, and a screw part P5 is formed.
In (d), the preform P (parison) is pulled out together with the core mold 32 from the mold portion 41a of the cavity 41,
Subsequently, the core type 32 attached to the support part 31 is also a neck type 3.
Pull out from inside the preform P held in 3 and 33.

[0004] Next, the preform P (parison) held by the neck dies 33, 33 is loaded into a heating pot (not shown) of the temperature control means, and the preform P
After the preform P is heated to the blow molding temperature, the preform P held by the neck molds 33, 33 as shown in FIG.
(The outer mold) is loaded into the bottle forming mold portion 52a provided therein, and then the blow assist plug 35 attached to the blow device support portion 51 is loaded into the preform P, and the neck mold 33, After fixing the support 33 and 33,
In (f), while the assist plug 35 is extended, the tip end pushes the inner bottom of the preform P and blows air from the blow air nozzle 51a to the assist plug 3.
5 and the preform P
Is expanded so as to be in intimate contact with the inner surface of the bottle forming mold part 52a to form the bottle 60, and then the bottle forming mold part 5
2a is cooled to solidify the bottle 60, and finally the cavities 52, 52 and the neck dies 33, 33 are opened as shown in FIG.

[0005] By the way, conventionally, in the molding process of the plastic bottle, a heating and strengthening treatment for increasing the strength by heating and crystallizing the mouth portion P3 of the bottle 60 is performed. Examples of the method of strengthening the heating include JP-A-57-189824 and JP-A-1-189824.
No. 258929.

The above method comprises the steps of heating the mouth, inserting a mold pin having an outer diameter slightly smaller than the diameter of the mouth into the heated mouth, and arranging the inside and outside of the mouth with the mold pin and cold air from outside. And whitening (crystallization) by the step of slow cooling.

In addition, for example, Japanese Patent Application Laid-Open No. Sho 62-28472
No. 3 discloses a method in which thermal crystallization is performed while heating the mouth of the preform from the outside, and a heating nozzle is closely fitted into the mouth and the inside of the mouth is also heated from the inside to form a thermal crystallization. In addition, the opening is pushed out from the inside and the mouth is gradually cooled after the heating nozzle is pulled out.

[0008] In addition, Japanese Patent Application Laid-Open No. 62-284724
This heat-crystallizes while heating the mouth of the preform from the outside, and closely inserts a heating nozzle into the mouth to heat the mouth from the inside to promote thermal crystallization. After the opening is pushed out from the inside and the heating nozzle is pulled out, the mouth is gradually cooled while being pressed in the inner radial direction by a jig fitted from the outside.

In addition to the above-mentioned conventional crystallization method for the mouth, for example, as disclosed in Japanese Patent Application Laid-Open No. 55-51525,
There is also a method of heating the mouth while rotating the bottle (bottle) for crystallization.

[0010]

However, the heat treatment of the mouth in the crystallization of the mouth of the plastic bottle as described above is performed using a heating means such as a heater, and the mouth is heated unevenly. The mouth is easily deformed or distorted due to the heat, and the diameter is liable to fluctuate.When the mouth is heated unevenly, the progress of crystallization becomes unstable and sufficient strength is obtained. May not be obtained.

Further, when the preform mouth is deformed as described above, the helical screw portion for the bottle cap formed outside the mouth is also deformed, and the dimension between the cap and the cap is reduced. There is a problem that the madness occurs.

Further, when the deformation of the preform mouth due to crystallization occurs as described above, the diameter of the preform mouth where the mouth is crystallized and the diameter of the preform mouth which is not crystallized are measured. In the post-process, using a preform with a crystallization port and a preform with an amorphization port in the same mold and blow method There is also a difference in the size of the mouth of the plastic bottle obtained by bottle molding, which causes a problem that blow molding with the same mold is difficult.

According to the present invention, in the crystallization of the mouth of a preform, blow molding of a plastic bottle is performed so as to crystallize the shape of the mouth so as not to cause irregular deformation and distortion, and to heat the entire mouth uniformly. The preform having a crystallized mouth portion which is crystallized by heating and cooling operations by a heating means with respect to the mouth portion of the preform (parison) for use, and the preform having an uncrystallized non-crystallized mouth portion. It is an object of the present invention to prevent a difference in the diameter of the mouth of the obtained plastic bottle even when the bottle is formed by a blow method using the same mold using both types of preforms. It is.

[0014]

The invention according to claim 1 of the present invention heats the mouth of a preform for plastic bottle blow molding and applies an expanding force to the mouth of the preform from the inner periphery of the mouth. A method for crystallizing a mouth portion of a preform for bottle molding, wherein the crystallizing treatment is performed in an expanded state after application.

According to a second aspect of the present invention, in the method for crystallizing a mouth of a preform for bottle molding according to the first aspect, the crystallization is performed while rotating the preform. This is a method for crystallizing the mouth of the preform for bottle molding.

According to a third aspect of the present invention, there is provided a method for crystallizing a preform mouth for bottle molding according to the first or second aspect, wherein the crystallization treatment includes an expansion force after starting heating. The method of crystallization of the mouth of the preform for bottle molding, characterized by starting the application of a preform.

According to a fourth aspect of the present invention, in the method for crystallizing a mouth of a preform for bottle molding according to the first or second aspect, the crystallization treatment starts applying expansion force. A method for crystallizing a mouth of a preform for bottle molding, wherein heating is started later.

According to a fifth aspect of the present invention, there is provided the method for crystallizing a mouth of a preform for bottle molding according to the first or second aspect, wherein the crystallization treatment includes heating and application of an expanding force. A method for crystallizing a mouth portion of a preform for bottle molding, which is started at the same time.

According to a sixth aspect of the present invention, in the method for crystallizing a preform mouth portion for bottle molding according to any one of the first to fifth aspects, the heating of the preform mouth portion is performed by using an outer peripheral surface of the mouth portion. Heating body fixed in position close to
Alternatively, there is provided a method for crystallizing a mouth portion of a preform for bottle molding, wherein heating is performed by a heating body rotating in proximity to an outer peripheral surface of the mouth portion.

According to a seventh aspect of the present invention, in the method for crystallizing a preform mouth portion for bottle molding according to any one of the first to sixth aspects, the heating of the preform mouth portion is performed by heating the preform mouth portion. A method for crystallizing a preform mouth for bottle molding, characterized in that a heat shielding plate provided near the outer periphery lower end removes the influence of heat downward from the lower end of the preform mouth to heat the preform mouth for bottle molding. is there.

According to an eighth aspect of the present invention, in the method for crystallizing a preform mouth for bottle molding according to any one of the first to seventh aspects, the crystallization treatment includes heating the preform to a blow molding temperature. A method for crystallization of a mouth portion of a preform for bottle molding, which is performed in a heating pot portion of a temperature adjusting and heating means for carrying out the process.

According to a ninth aspect of the present invention, there is provided a preform heating means rotatably supported by a rotating shaft so as to be vertically driven and rotatable on the lower support frame, and to be relatively close to the lower support frame. A preform mouth expanding means which is supported by a rotating shaft so as to be vertically rotatable and rotatable in a vertically movable upper support frame, wherein the downward expanding member of the expanding means is an upper opening of the temperature adjusting and heating means. A crystallization apparatus for a bottle forming preform mouth portion, which is provided so as to be able to be inserted and detached from an upward opening portion of a preform loaded in a heating pot portion having the following.

According to a tenth aspect of the present invention, there is provided the bottle forming preform of the ninth aspect of the present invention, wherein the plurality of crystallizers are respectively provided in a lower support frame and an upper support frame. Or, each is rotatably supported by a common lower support frame and upper support frame,
A bottle forming preform crystallization apparatus which is arranged adjacent to each other.

According to an eleventh aspect of the present invention, there is provided the bottle forming preform crystallization apparatus according to the ninth or tenth aspect of the present invention, wherein the temperature of the preform which is rotatably supported on the shaft is controlled. This is a crystallization apparatus for a bottle forming preform mouth, wherein the adjusting heating means and the preform mouth expanding means are respectively driven and rotated via a main rotating gear attached to the rotating shaft.

According to a twelfth aspect of the present invention, there is provided a bottle forming preform crystallization apparatus according to the tenth or the eleventh aspect, wherein a plurality of crystallization apparatuses are provided around a driven and rotated sun gear. The main rotating gears which are arranged adjacent to each other in a circular shape and which are attached to the rotating shafts of the preform temperature adjusting heating means and the preform opening expanding means are driven and rotated by the sun gear. This is a crystallization apparatus for the mouth of a preform for bottle molding.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION A method for crystallizing a mouth portion of a preform for bottle molding according to the present invention will be described in detail below with reference to an embodiment shown in FIGS.

First, FIG. 1 (a) shows a preform molding process (FIG. 8 (a) to FIG. 8 (a) to FIG.
In the plastic injection molding step shown in (d)), the preform P for bottle molding, which has been preliminarily molded and processed, is placed in the housing portion 3 of the heating pot portion 2 of the preform temperature adjusting and heating means A in the preform opening portion. P3 is loaded upward and fixedly held so that P3 projects upward and outward from the upper end of the housing portion 3.

At this time, the temperature in the storage section 3 of the heating pot section 2 is already at a predetermined temperature (at least a normal temperature and a glass transition point temperature of the preform P) at the time of loading the preform P. So, for example, 63 ° C ~
It may be heated to about 121 ° C. or at room temperature. In addition, the temperature of the preform P including the mouth portion P3 when the preform P is loaded into the storage section 3 may be a temperature state that is lowered from the heating temperature in the preform molding process to about 63 ° C to 121 ° C. And normal temperature 20 ° C-63 ° C
It may be in a temperature state of a degree.

The accommodating portion 3 has, for example, an outer shape larger than the preform P as shown in the figure. You. If the preform P does not have the flange portion P4, the housing 3 has the same shape as the outer shape of the preform P, and
The body P1 and the bottom P2 may be fixedly held by the entire inner surface of the housing 3.

Subsequently, as shown in FIG. 1 (b), the air in the storage section 3 is sucked from the air suction hole 4 formed at the bottom of the heating pot section 2 by a vacuum device connected to the air discharge section 5, and the air is sucked. The reform P is suction-held to the heating pot unit 2.

Subsequently, in FIG. 1B, an expanding force f indicated by an arrow is applied from the inner peripheral side of the preform opening P3 to the outer peripheral direction, and an arrow is applied from the outer peripheral side of the preform opening P3 toward the outer peripheral surface. Is applied to perform crystallization treatment and diameter adjustment treatment of the mouth P3. At that time, if necessary, the heat h is applied by disposing the heat shielding plate 22 close to the outer periphery of the preform opening P3 at the boundary between the outer periphery of the preform opening P3 and the flange P4. I do.

The temperature and time of the heating h applied to the preform mouth P3 are, for example, about 63 ° C. to 121 ° C. (of which 120 ° C. or less is suitable), or the preform mouth P
70 ° C or higher 140 ° C to 170 ° C, which is the glass transition point of 3
The following is appropriate, and the application time is suitably from 40 seconds to 180 seconds or more, and from 4 minutes to 10 minutes or less. Further, the expansion force f applied to the preform mouth P3 and the application time are as follows:
In the heating h, a force enough to expand the opening P3 to a predetermined diameter required by the opening P3 is sufficient. Examples of the heating element for applying the heating h include an electric heater method, a heating air method and a steam method in which heated air and steam are circulated and sent, other high-frequency heating methods, an ultrasonic heating method, and a halogen heater method. .

As for the application of the expansion force f and the heating h, either of the applications may be started while one of the applications is started and continued for a predetermined time, or both applications may be started simultaneously. May be continued. Also, the expansion force f
The application of heat and heating h may be performed while the preform P is stationary or the preform P may be rotated.

Next, in FIG. 2 (a), while the application of the expanding force f to the mouth P3 is continued, the application of the heating h is stopped, and the mouth P3 is stopped.
Is crystallized by slow or rapid cooling with an air blow c at room temperature or cold temperature.

As a result, as shown in FIG. 2B, the preform opening P3 and the screw formed on the outer periphery of the opening P3 are crystallized to increase the strength and the diameter 2r of the opening P3.
Is set to a predetermined diameter.

Thus, the opening P3 of the preform P
Is crystallized and strengthened, the preform P is housed in the housing 3 of the heating pot 2 of the temperature adjusting means A, and the body P1 and the bottom P2 of the preform P are kept.
Is heated to the blow molding temperature.

Then, as shown in FIG. 8 (e) in the prior art, after the neck dies 33, 33 are fitted and closed on the thread portion P5 on the outer periphery of the opening P3 of the preform P, the blow molding cavity is formed. Cavity 52 of part 50 (outer die)
The blow assist plug 35 attached to the blow device support portion 51 is loaded into the preform P, and the neck dies 33, 33 and the support portion 51 are loaded. And fix.

Then, as shown in FIG. 8 (f), the preform P
Blow air while pressing the inner bottom of the blow air nozzle 5
1a, the bottle is introduced between the assist plug 35 and the preform P, and the preform P is expanded so as to be in close contact with the inner surface of the bottle forming mold 52a to form the bottle 60. The bottle 52 is cooled to solidify the bottle 60, and finally, as shown in FIG. 8 (g), the cavities 52, 52 and the neck dies 33, 33 are opened to complete the molding of the bottle 60.

Next, an embodiment of the apparatus for crystallizing the mouth of a preform for bottle molding according to the present invention will be described in detail with reference to the embodiments shown in FIGS.

FIG. 3 is a front sectional view of the crystallization apparatus of the present invention.
FIG. 4 is a side sectional view thereof. As shown in FIG.
, And a preform opening expanding means B are provided on the upper part thereof so as to face each other.

The temperature adjusting and heating means A is provided with a heating pot 2 for temperature adjusting and heating the preform P rotatably supported by the bearing 1 on the outer periphery.
Is provided with a cylindrical preform accommodating section 3 which is open at the top and closed at the bottom with an air suction hole 4, which communicates with an air suction outlet 5 for sucking air to the outside. are doing.

A vertical support shaft portion 6 is provided below the heating pot portion 2, and the support shaft portion 6 is rotatably supported by the lower frame F 1 and includes a main rotating gear 7.

The preform P is inserted into the preform accommodating portion 3 with the body P3 inserted with the bottom P2 downward and the mouth P3 upward, and a flange P at the mouth P3.
4 is hooked on the upper end of the pot portion 2 to be loaded.

The preform mouth expanding means B includes a rotating body 12 rotatably supported by a bearing 11 on the outer periphery, and the rotating body 12 has a spindle 18 at an upper portion thereof. Reference numeral 18 is rotatably supported by the upper frame F2, and has a main rotating gear 19.

The lower part of the rotating body 12 can be divided into several divided bodies (for example, about 3 to 6 or more divided bodies) by sliding horizontally in the outer peripheral direction protruding downward. A split mold part 14 for expansion is provided, and the split mold part 14 is rotatable integrally with the rotating body 12.

The split mold portion 14 is composed of a projecting portion 14a projecting downward and a flange portion 14b projecting horizontally, and the flange portion 14b is a rotating body 12 which also serves as a slide guide in the horizontal direction. Is slidably held by a bracket 13 attached to the bracket.
On the outer periphery of the flange portion 14b, there is provided an elastic body 15 held by a bracket 13 which urges the split mold portion 14 which can be divided in the outer peripheral direction in a direction of uniting toward the center of rotation. .

The inside of the center of the split mold portion 14 is provided with a vertical cavity portion 14c having a tapered (reversely tapered) tapered shape in a downward direction, and vertically moves vertically inside the cavity portion 14c. A vertical taper member 16 tapering down to a possible lower diameter, wherein said taper member 1
6 is a support shaft 20 which can be vertically inserted and moved in the support shaft 12.
The air cylinder 20 is integrally attached to the distal end of the operating rod 20a of the air cylinder 20 which is integrally attached to and extends and contracts in the vertical direction.

The taper member 16 is moved downward by the extension operation of the air cylinder 20 so that the tapered hollow portion 14c is formed.
Into the cavity, and further into the cavity while being in contact with the inner wall of the cavity, the split mold portion 14
4a, it is divided and pushed and expanded, and the plurality of divided projections 14a are expanded outward. On the other hand, by raising the taper member 16 by the shortening operation of the air cylinder 20, the divided protruding portions 14a can be united by the urging force of the elastic body 15 to return to the original state. I have.

As shown in the side sectional view of the above device in FIG.
A heating section 21 for heating the opening P3 of the preform P from the outer peripheral side is provided above the upper end of the heating pot section 2 of the temperature adjusting and heating means A.

As shown in FIG. 4, the heating section 21 has an opening P3 of the preform P at the upper end of the heating pot section 2.
The portion is heated from the outer peripheral side for the crystallization treatment. For example, the heating unit 21 is provided only on the front side or only on the back side, or on the front side and the back side. Further, the heating unit 21 may be provided on one of the front side and the back side, and a heat reflecting plate such as a plane mirror or a concave mirror may be provided on the other side. In addition, a heat shielding plate 22 is provided below the heating unit 21 as needed. Note that the heating unit 21 and the heat shield plate 22 are attached and supported, for example, on the upper outer periphery of the bearing unit 1 of the temperature adjustment heating unit A.

The temperature adjusting and heating means A and the mouth expanding means B directly above the temperature adjusting and heating means A can be separated from and approach to each other. In the present invention, the lower supporting frame F1 for supporting the temperature adjusting and heating means A is provided. Alternatively, the upper supporting frame F2 for supporting the mouth expanding means B, or both supporting frames F
1 and F2 are provided so as to be slidable in a vertical direction with respect to an apparatus body frame (not shown), and are provided with a predetermined actuator (for example, an air cylinder, a hydraulic Cylinder,
Rack gear-pinion gear).

For example, as shown in FIGS. 3 and 4, by providing the upper support frame F2 so as to be able to move up and down, the upper support frame F2 can be moved down as shown in FIG. As a result, the mouth expanding means B is brought closer to the temperature adjusting and heating means A, and the projection 14a in the united state of the split mold part 14 is inserted into the heating pot 2 of the temperature adjusting and heating means A. It can be inserted into the opening P3 of P (from the upper end of the opening P3 to the vicinity of the flange P4).

Then, as shown in FIG. 6, the taper member 16 (inverted taper member) is moved downward to thereby form the inversely tapered hollow portion 14c of the split mold portion 14 composed of an aggregate of a plurality of protrusions 14a. And the split mold portion 14 composed of an aggregate of the projecting portions 14a is changed from the united state to the split state, and each of the projecting portions 14a is horizontally split as shown by an arrow against the urging force of the elastic member 15. The outer surface of each protruding portion 14a is extended from the upper end of the opening P3 of the preform P to the flange P below the outer surface of each of the protruding portions 14a by expanding the mold 14 in the outer circumferential (outer diameter) direction.
4 While uniformly pressing the inner peripheral surface of the portion where the outer peripheral thread portion of the mouth P3 is formed in the vicinity, the diameter of the mouth P3 is slightly expanded so as to have a predetermined diameter, and Can be adjusted appropriately.

The apparatus for crystallizing the mouth of the preform for bottle molding according to the present invention is as described above, but may have the following structure as another embodiment.

For example, the crystallization apparatus at the mouth of the preform for bottle molding is one unit, and a plurality of the crystallization apparatuses are shown in FIG.
As shown in FIG.

In the adjacent arrangement, each of a plurality of crystallizers at the mouth of the preform for bottle molding is rotatably supported by the respective lower supporting frame F1 and upper supporting frame F2, and is adjacent to each other. They may be arranged.

Alternatively, in the adjacent arrangement form, a plurality of bottle forming preform opening crystallization devices are rotatably supported by a common lower support frame and upper support frame and are arranged adjacent to each other. It may be what has been done.

FIG. 7 is a schematic plan view showing an example of an adjacent arrangement of a plurality of bottle forming preform mouth crystallization devices. And the preform mouth expanding means B are arranged adjacent to each other in a circular shape around the driving and rotating sun gear 10, and the temperature adjusting heating means and the rotating shaft of the mouth expanding means of each of the crystallization devices. The attached main rotary gears 7, 19 are driven and rotated by two upper and lower sun gears 10, 10. The main rotating gear 7,
The diameter of each of 19 and the diameter of each of the sun gears 10, 10 may be the same or different.

In the crystallization apparatus at the mouth of the preform for forming a bottle, each of the plurality of crystallization apparatuses arranged adjacent to each other has a bearing portion 1 on the temperature adjustment heating means A side or each of the bearing portions. The bearing portions 11 on the side of the section 1 and the expanding means B are respectively connected to the support frames F1,
As shown in FIG. 3, the bearings 1 which are separated from each other without being supported by F2 are horizontally rotated by a bracket 8a for horizontal rotation connection and a vertical support shaft 8b in a scalar manner. The upper and lower bearings 1 adjacent to each other and the upper and lower bearings 11 adjacent to each other are horizontally connected in a scalar manner by a bracket 17 for horizontal rotation connection and a vertical support shaft 9. The connection may be such that the connection is rotatable in the direction.

[0060]

According to the plastic bottle molding method of the present invention, the mouth of a preform (parison) for plastic bottle blow molding is uniformly heated by a heating section, and the mouth is directed from the inner periphery to the outer periphery. By forcibly expanding to a predetermined diameter, and then cooling and solidifying, stable and uniform crystallization of the preform mouth becomes possible, and the strength of the preform mouth or the bottle mouth after plastic bottle molding is reduced. It is effective for improvement.

Further, since the opening is pushed and expanded to a predetermined diameter and expanded to be cooled and solidified, it is not always necessary to design the screw in consideration of dimensional shrinkage caused by crystallization. As a result, the same injection molding die is used. It is possible to standardize a heated mouth product (a mouth crystallized preform) and a non-heated mouth product (a mouth non-crystallized preform), thereby improving production efficiency.

[Brief description of the drawings]

FIGS. 1A and 1B are process diagrams showing an embodiment of a crystallization method of the present invention.

FIGS. 2A and 2B are process diagrams showing an embodiment of a crystallization method of the present invention.

FIG. 3 is a front sectional view of the crystallization apparatus of the present invention.

FIG. 4 is a side sectional view of the crystallization apparatus of the present invention.

FIG. 5 is a front sectional view illustrating the operation of the crystallization apparatus of the present invention.

FIG. 6 is a front sectional view for explaining the operation of the crystallization apparatus of the present invention.

FIG. 7 is a schematic plan view illustrating another embodiment of the crystallization apparatus of the present invention.

FIG. 8 is a process chart of a conventional preform molding process and a plastic bottle molding process.

[Explanation of symbols]

A: Preform temperature adjusting and heating means B: Preform mouth expanding means F1: Lower support frame F2: Upper support frame P: Preform P1: Preform body P2: Preform bottom P3: Preform mouth P4: Preform Reform flange part P5 ... preform screw part 1 ... bearing part 2 ... heating pot part 3 ... preform storage part 4 ... air suction hole 5 ... air discharge port 6 ... rotating shaft 7 ... main rotating gear 10 ...
Sun gear 11 ... Bearing part 12 ... Rotating body 13 ... Bracket for horizontal guide 14 ...
Split mold part 14a Projecting part 14b Horizontal sliding part 14c ... Inverted tapered hollow part 15 ... Elastic member 16 ... Inverted tapered member 17 ... Bracket 18 ... Rotating shaft 19 ... Main rotating shaft 20 ... Air cylinder 21 ... Operating rod

Continued on the front page F term (reference) 4F208 AA24 AG07 AG24 AH55 AR01 AR06 LA02 LB01 LG28 LH01 LH02 LH07 LH08 LH13 LH18 LJ22

Claims (12)

[Claims] The present invention is characterized in that the mouth portion of a preform for plastic bottle blow molding is heated and an expanding force is applied to the mouth portion of the preform from the inner periphery to the outer periphery of the preform so that the preform is crystallized in an expanded state. A method for crystallizing the mouth of a preform for bottle molding. 2. The method according to claim 1, wherein the crystallization process is performed while rotating the preform. Method. 3. The method for crystallizing a mouth of a preform for bottle molding according to claim 1, wherein the crystallization treatment starts applying expansion force after starting heating. A method for crystallizing the mouth of a preform for bottle molding. 4. The method for crystallizing a mouth of a preform for bottle molding according to claim 1 or 2, wherein the crystallization treatment starts heating after applying expansion force. A method for crystallizing the mouth of a preform for bottle molding. 5. A method for crystallizing a mouth of a preform for molding a bottle according to claim 1, wherein the crystallization process starts heating and application of an expanding force at the same time. Crystallization method for preform mouth. 6. The method for crystallizing a preform mouth for bottle molding according to claim 1, wherein the heating of the mouth of the preform is fixed at a fixed position close to an outer peripheral surface of the mouth. A method for crystallizing a mouth of a preform for bottle molding, wherein heating is performed by a heating body or a heating body that rotates in proximity to an outer peripheral surface of the mouth. 7. The method for crystallizing a preform mouth for bottle molding according to claim 1, wherein said preform mouth is heated by a heat provided close to a lower end of the outer periphery of the preform mouth. A method for crystallizing a mouth of a preform for bottle molding, wherein the heat is removed by using a shielding plate to remove the influence of heat downward from the lower end of the outer periphery of the preform mouth. 8. A method according to claim 1, wherein said preform is heated to a temperature controlled heating means for heating said preform to a blow molding temperature. A method for crystallizing a mouth of a preform for bottle molding, wherein the method is performed in a part. 9. A preform heating means rotatably supported by a rotating shaft so as to be vertically rotatable and driveable vertically to the lower support frame, and a preform heating means which is vertically movable relative to the lower support frame. A preform mouth expanding means rotatably supported by a rotating shaft so as to be rotatable downward,
A bottle, wherein the downward expansion member of the expansion means is provided so as to be able to be inserted and removed from an upward opening of a preform loaded in a heating pot having an upper opening of the temperature adjusting and heating means. A crystallization device for the mouth of the preform for molding. 10. The apparatus for crystallizing a mouth of a preform for molding a bottle according to claim 9, wherein the plurality of units are respectively provided on an individual lower supporting frame and an upper supporting frame, or on a common lower supporting frame and an upper supporting frame, respectively. A crystallization apparatus for a mouth portion of a preform for bottle molding, wherein the crystallization device is rotatably supported on the preform and is arranged adjacent to each other. 11. The preform temperature adjusting and heating means and the preform mouth expanding means which are rotatably supported on a shaft are respectively driven and rotated via main rotating gears attached to the rotating shaft. A crystallization apparatus for a mouth of a preform for bottle molding according to the above. 12. A bottle forming preform mouth crystallization apparatus according to claim 10 or 11, wherein a plurality of crystallization apparatuses are arranged adjacent to each other around a driving and rotating sun gear in a circular shape. An apparatus for crystallizing a preform mouth for bottle molding, wherein a main rotating gear attached to a rotating shaft of a reforming temperature adjusting heating means and a preform mouth expanding means is driven and rotated by the sun gear.