JPH0847967A - Production of preform for bottle body having crystallized mouth part, and production of bottle body - Google Patents

Abstract

PURPOSE:To obtain a molded product having a crystallized mouth part capable of improving the bonding of a core material and a resin by forming a crystallized core material and preheating a bonding scheduled region to make the material amorphous and filling a mold with a bottle body-forming resin to mold a preform for a bottle body. CONSTITUTION:The mouth part 2 of a preform 1 for a bottle body is formed from a laminated structure consisting of a core material 3 composed of a crystallized PET resin and a PET resin part A for the preform. A mouth part upper end 4, a screw part 5, a skirt part 15 and a support ring S are successively formed to the core material 3 from above. A bonding scheduled region 7 is formed to the inner wall of the region between the skirt part 15 and the support rings S and made amorphous. A neck part B and a body part 8 are provided to the resin part A. At the time of molding, the crystallized core material 3 is formed and the bonding scheduled region 7 is preheated to be made amorphous and a mold is filled with a bottle body-forming resin to mold a preform 1 for a bottle body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a bottle preform having a crystallized mouth and a method for producing a bottle, such as polyethylene terephthalate (PE).
T) When biaxially stretch-blow molding the bottle preform, the PET resin for preform is injected into the crystallized core material (insert piece) made of PET resin so that the mouth of the bottle preform is opened. The present invention relates to a method for improving adhesion between the crystallized core material and the PET resin for preform when the laminated structure of the core material and PET resin for preform is formed.

[0002]

2. Description of the Related Art Conventionally, as a preform for seed bottles, insert pieces made of a heat-resistant resin or crystals made of a non-stretched PET resin which has been whitened in advance by heat treatment have been used. It has been proposed that the cut insert piece is mounted in a mold, and the mold is filled with PET resin for preform by injection or the like to mold the mouth portion into a multi-layered laminated structure (JP-A-5-1123).
However, when a PET bottle obtained by biaxially stretch blow molding this bottle preform is filled with liquid and then the mouth is capped, a top load (vertical load) and Tightening torque is 1 each
If it takes about 0 to 15 kg and 10 to 25 kg · cm, the mouth portion may be deformed due to insufficient adhesion between the crystallized insert piece and the PET resin portion for preform. Problems such as impossible capping are likely to occur. Further, the heat-resistant resin used to impart the same performance as the crystallized insert piece was much more expensive than the cheap PET resin.

The present invention has been made in view of the above problems, and its object is to provide a crystallized core material and a P for preform.
It is an object of the present invention to provide a method for producing a bottle preform having a crystallized mouth portion capable of adhering well to an ET resin and a method for producing a bottle.

[0004]

In order to achieve the above object, a method for producing a preform for bottles having a crystallized mouth of the present invention is a core formed into a predetermined shape and crystallized. Material is mounted in a mold, and a preform bottle-forming resin of the same or equivalent material as the core material is filled into the mold by injection or the like to laminate the core material and the preform bottle-forming resin layer. When molding a bottle preform having a mouth part having a structure, a crystallized core material is formed, and subsequently, a bond between the crystallized core material and the preform bottle body forming resin is planned. The region is preliminarily non-crystallized by heat treatment, and then the bottle forming resin for preform is filled in the mold to form the bottle preform. Here, the preform bottle forming resin,
The same material as the core material is preferable, but a combination with any other resin may be used as long as the main components are the same.

Further, according to another aspect of the present invention, when molding a heat-resistant bottle having a crystallized mouth portion, a crystallized core material is attached to a mold, and then the crystallized material is crystallized. The area to be bonded to the preform bottle forming resin in the core material is previously made amorphous by heat treatment, and then the preform bottle forming resin of the same or equivalent material as the core material is injected to the mold. The present invention provides a method for producing a bottle body, which comprises filling the same into a bottle body preform to form a bottle body preform and subjecting the bottle body preform to biaxial stretching blow molding.

[0006]

[Function] Before filling the preform bottle forming resin into the mold, the pre-bonded bottle forming resin is preliminarily made to be non-crystallized by heat treatment in the region where the crystallized core material is to be bonded. After filling in the mold, a bottle preform having a mouth part having a laminated structure of a core material and a preform bottle forming resin can be molded. Therefore, the adhesive strength between the core material and the preform bottle-forming resin layer is high, and the vertical load and the tightening torque are 10 to 15 kg and 10 respectively during capping after high temperature liquid filling or after liquid filling and heating. Even if it takes about 25 kg · cm, the mouth portion has sufficient strength to withstand this, so that the cap portion can be capped without causing any deformations in the mouth portion.

Then, the bottle preform molded as described above can be biaxially stretch blow molded to manufacture a bottle having a highly heat resistant mouth.

Further, according to the present invention, even if an expensive heat-resistant resin is not used, an inexpensive resin, for example, a PET resin, is used to form the core material into a predetermined shape. A bottle-forming resin for preform consisting of can be molded into a bottle preform by filling the mold by injection or the like, and the bottle preform is biaxially stretch blow-molded to be inexpensive and highly heat resistant. It has an advantage that a heat-resistant bottle having a mouth can be manufactured.

[0009]

Embodiments of the present invention will be described below.
However, the present invention is not limited thereby. 1, 4 and 6 show a first embodiment of the present invention. 1, 4, and 6, the mouth portion 2 of the bottle preform 1 has a laminated structure of a core material 3 made of crystallized PET resin and a PET resin portion A for preform. The core member 3 includes a mouth upper end 4 and a screw portion 5.
And a skirt portion 15 and a support ring S, which will be described later with reference to FIGS. 2 to 5, are sequentially formed in a predetermined shape from above, and the inner wall of the region 6 between the skirt portion 15 and the support ring S is a region to be bonded. 7, the planned adhesion region 7 is non-crystallized. Then, the bottle preform 1 has the core 2 in the mouth 2 and the area 7 to be bonded.
It comprises a neck portion B and a body portion 8 which are continuous with the preform PET resin portion A adhered thereto (see FIG. 6).

In this bottle preform 1, as shown in FIG. 2, the core material 3 is crystallized by using the mold 9, and as shown in FIG. 3, the skirt portion 15 of the crystallized core material 3 is used. And the inner wall 7 of the region 6 between the support ring S is amorphized by heat treatment, and subsequently, as shown in FIG.
0, after the cavity mold 11 has been clamped, the PET resin M is introduced from the gate G into the cavity mold 11 by injection molding, and the mouth portion 2 and the neck portion B and the body connected to the PET resin portion A for preform are connected. The part 8 is formed by molding.

At this time, as shown in FIG. 3, the skirt portion 1
In order to non-crystallize the inner wall (planned bonding area) 7 of the area 6 between the support ring 5 and the support ring S by heating, the heated air 12 is introduced into the planned bonding area 7 or a built-in heater is used. The inner wall 7 is non-crystallized by heating to a desired temperature (see FIGS. 3 and 4).

Then, the bottle preform 1 molded as described above is biaxially stretch blow molded. As a result, as shown in FIG. 7, the crystallized mouth portion 2 and the transparent body portion 13 having the biaxial orientation are bonded via the non-crystallized inner wall 7. The integrated bottle body 14 can be manufactured.

As described above, in this embodiment, the crystallized core material 3 is filled before filling the preform bottle forming resin into the mold.
Since the area 7 to be adhered to is amorphized by heat treatment in advance, after the PET resin of the same or equivalent material as the core material 3 is filled in the mold, the core material 3 and the PET resin portion A for preform are laminated. The bottle preform 1 having the structured mouth portion 2 can be molded. Therefore, the adhesive strength between the core material 3 and the bottle forming resin for preform is high, and the vertical load and the tightening torque are 10 to 15 kg and 10 respectively during capping after the high temperature liquid filling or the liquid filling heating. Even if it takes about 25 kg · cm, since the mouth portion 2 has sufficient strength to withstand it, the mouth portion is not deformed and capping can be performed without trouble.

The bottle body preform 1 molded as described above can be biaxially stretch blow molded to manufacture the bottle body 14 having high heat resistance.

Further, in this embodiment, the core material 3 is formed into a predetermined shape by using an inexpensive PET resin without using an expensive heat-resistant resin which has been conventionally used, and the core material 3 is formed into a predetermined shape. A preform bottle body forming resin made of the same or equivalent material PET resin can be injected into the mold to form the bottle body preform 1, and the bottle body preform 1 can be biaxially stretch blow molded. It has an advantage that a heat-resistant bottle body 14 having a crystallized mouth portion 2 can be manufactured at low cost.

FIG. 8 shows that the non-crystallized pre-bonded region 7 of the core material 3 is an inner wall including the mouth upper end 4, the screw portion 5, the skirt portion 15 and the region 6 between the support rings S. 2nd Example of is shown.

FIG. 9 shows a third embodiment of the present invention in which the non-crystallized pre-bonded region 7 of the core material 3 is the lower surface of the support ring S.

Also in each of the second and third embodiments, the core material 3 having the non-crystallized pre-bonding region 7 and the PE for preform are used.
It is possible to mold the bottle preform 1 having the mouth portion 2 having a laminated structure with the T resin portion A.

In FIG. 10, the non-crystallized pre-bonded region 7 of the core material 3 having no support ring S as in the first, second and third embodiments is the inner wall of the screw portion 5 and the skirt portion 15. The fourth embodiment of the present invention will be described.

As a modification of the fourth embodiment, the area to be adhered may be extended to the inner wall of the mouth upper end 4.

FIG. 11 shows the crystallized core member 3, the upper end 4 of the mouth portion, the middle portion 16 of the mouth portion where the screw portion 5 is not formed as in the above embodiments, the skirt portion 15 and the support ring. The region 6 between S is formed in advance in order from above, and the non-crystallized pre-bonding region 7 of the core material 3 has the mouth upper end 4, the mouth middle portion 16, the skirt portion 15 and the support ring S. The 5th Example of this invention which is an inner wall of the area | region 6 between is shown.

The mouth portion 2 of the bottle preform 1 of this embodiment
The first step is to mold the precrystallized core material 3 in which the inner wall 7 of the mouth upper end 4, the mouth middle portion 16, the skirt 15 and the support ring S is amorphized. The mold is held by clamping with a mold, the core mold and the cavity mold are clamped following the mold clamping of the mouth molding mold as in the previous embodiment, and then the PET resin is injection molded from the gate into the cavity. Alternatively, it is formed by introducing by compression molding to form the body portion a, and subsequently, the PET resin is made to wrap around from the inside of the core material 3 to the outside to form the mouth portion 2.
The mouth portion 2 usually has a three-layer structure in which the core material 3 is sandwiched by PET resin.

In FIG. 12, the mouth upper end 4, the mouth middle portion 16, the skirt portion 15 and the support ring S are preliminarily formed on the crystallized core material 3 in this order from above.
A sixth embodiment of the present invention is shown in which the non-crystallized pre-bonded area 7 of the core material 3 is the inner wall of the area 6 between the mouth upper end 4, the mouth middle portion 16, the skirt portion 15 and the support ring S. . The mouth 2 of the bottle preform 1 of the present embodiment is different only in that the shape of the mouth 2 of the bottle preform 1 of the fifth embodiment is changed from a three-layer structure to a two-layer structure. In each of the fifth and sixth embodiments, the bottle body having the mouth portion 2 having the laminated structure of the core material 3 having the non-crystallized pre-bonding region 7 and the PET resin portion A for preform Preforms can be molded.

[0024]

As described above, according to the present invention, the area to be bonded to the crystallized core material is pre-amorphized by heat treatment before filling the preform bottle forming resin into the mold. After filling the preform bottle-forming resin into the mold, a bottle preform having a mouth portion having a laminated structure of the core material and the preform bottle-forming resin can be molded.
Therefore, the adhesive strength between the core material and the preform bottle-forming resin layer is high, and the vertical load and the tightening torque are 10 to 15 kg and 10 respectively during capping after high temperature liquid filling or after liquid filling and heating. ~ 25kg
-Even if it takes about cm, the mouth portion has sufficient strength to withstand it, so that the mouth portion is not deformed and capping can be performed without any trouble.

Then, the bottle preform molded as described above can be biaxially stretch blow molded to manufacture a bottle having a highly heat resistant mouth.

Further, according to the present invention, even if an expensive heat-resistant resin is not used, an inexpensive resin, for example, a PET resin is used to form the core material into a predetermined shape, and the same or equivalent resin material as the core material is used. A bottle-forming resin for preform consisting of can be molded into a bottle preform by filling the mold by injection or the like, and the bottle preform is biaxially stretch blow-molded to be inexpensive and highly heat resistant. It has an advantage that a heat-resistant bottle having a mouth can be manufactured.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an overall configuration showing a first embodiment of the present invention.

FIG. 2 is a structural explanatory view showing a first step of a method for manufacturing a bottle preform in the above-mentioned embodiment.

FIG. 3 is a structural explanatory view showing a second step of the method for manufacturing a bottle preform in the above embodiment.

FIG. 4 is a structural explanatory view showing a third step of the method for manufacturing a bottle preform in the above embodiment.

FIG. 5 is a structural explanatory view showing a fourth step of the method for manufacturing a bottle preform in the above-mentioned embodiment.

FIG. 6 is a structural explanatory view showing a bottle preform in the above embodiment.

FIG. 7 is a structural explanatory view showing a bottle body in the above embodiment.

FIG. 8 is an explanatory diagram of a main part configuration showing a second embodiment of the present invention.

FIG. 9 is an explanatory diagram of a main part configuration showing a third embodiment of the present invention.

FIG. 10 is an explanatory diagram of a main part configuration showing a fourth embodiment of the present invention.

FIG. 11 is an explanatory diagram of a main part configuration showing a fifth embodiment of the present invention.

FIG. 12 is an explanatory diagram of a main part configuration showing a sixth embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bottle preform, 2 ... Mouth part, 3 ... Core material, 4 ... Mouth top, 5 ... Screw part, 6 ... Area between skirt part and support ring, 7 ... Area to be adhered, 8 ... Bottle body Body of preform, 13 ... body of bottle, 14 ... bottle, 16 ... middle part of mouth, A ... PET resin for preform (bottle forming resin for preform), B ... neck.

Claims (9)

[Claims] 1. A crystallized core material formed into a predetermined shape is mounted on a mold, and a preform bottle forming resin of the same or equivalent material as the core material is injected into the mold. When molding a bottle preform having a mouth part composed of a laminated structure of the core material and the preform bottle body forming resin layer filled, a crystallized core material is formed, and subsequently,
A region to be bonded to the preform bottle-forming resin in the crystallized core material is preliminarily non-crystallized by heat treatment, and then the preform bottle-forming resin is filled in the mold to form a bottle. A method for producing a bottle preform having a crystallized mouth, which comprises molding a preform for bottles. 2. The crystallized core material is preliminarily formed with an upper end of a mouth portion, a screw portion, and a skirt portion in order from above, and a non-crystallized pre-bonded region of the core material is formed. The method for producing a bottle preform having a crystallized mouth according to claim 1, which is at least the inner wall of the screw portion and the skirt portion. 3. The crystallized core material is preliminarily formed with an upper end of a mouth portion, a screw portion, a skirt portion, and a support ring in order from above, and the core material is non-crystallized. The method for producing a preform for a bottle having a crystallized mouth according to claim 1, wherein the area to be bonded is an inner wall of the area between the skirt and the support ring. 4. The crystallized core material is preliminarily formed with a mouth upper end, a screw portion, a skirt portion, and a support ring in order from above, and the core material is non-crystallized. The preform for a bottle body having a crystallized mouth portion according to claim 1, wherein the region to be adhered is an inner wall including the upper end of the mouth portion to a region between the screw portion, the skirt portion and the support ring. Method. 5. The crystallized core material is preliminarily formed with a mouth upper end, a screw portion, a skirt portion, and a support ring in order from above, and the core material is non-crystallized. The method for manufacturing a bottle preform having a crystallized mouth according to claim 1, wherein the region to be bonded is the lower surface of the support ring. 6. The crystallized core material includes an upper end of a mouth portion, a middle portion of the mouth portion in which a screw portion is not formed, a skirt portion,
The support ring and the support ring are pre-formed sequentially from the upper side, and the non-crystallized pre-bonded region of the core member is the inner wall of the region between the upper end of the mouth, the middle part of the mouth, the skirt and the support ring. The method for producing a bottle preform having a crystallized mouth according to claim 1. 7. The method for manufacturing a bottle preform having a crystallized mouth according to claim 1, wherein the bottle preform is made of a saturated polyester resin. 8. When molding a heat resistant bottle having a crystallized mouth portion, a crystallized core material is mounted on a mold, and subsequently, a preform bottle body in the crystallized core material. A region to be adhered to the forming resin is non-crystallized by heat treatment in advance, and then a preform bottle forming resin of the same or equivalent material as the core material is filled in the mold by injection or the like to preform the bottle body. And a biaxial stretch blow molding of the bottle preform. 9. The method for producing a bottle according to claim 8, wherein the bottle preform is made of a saturated polyester resin.