JP3159400B2 - Preforms and heat resistant bottles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preform and a heat-resistant bottle capable of manufacturing a bottle having a mouth having excellent heat resistance, and more particularly, to an insert made of a heat-resistant material disposed on the outer periphery of the mouth. The present invention relates to a preform in which a member is firmly fixed to an inner peripheral portion of a mouth, and a heat resistant bottle formed therefrom.

[0002]

2. Description of the Related Art In recent years, 80-95 ° C.
So-called hot fill, which is filled with a liquid, juice containing carbon dioxide, pasteurizing by a hot shower for bottles filled with lactic acid bacteria beverages, etc., and therefore, excellent heat resistance is particularly required near the mouth. It became so. This is because the mouth is first exposed to a hot liquid in a hot fill, and it is common to pour the hot shower from above the bottle even in pasteurizing with a hot shower.

However, in the case of a polyester bottle obtained by ordinary biaxial stretch blow molding, since the mouth portion is left unstretched, heat resistance cannot be imparted by stretching, so that a liquid at 80 to 95 ° C. cannot be filled. Cannot be served.

[0004] Under such circumstances, various attempts have been made to impart heat resistance to the polyester bottle, particularly near the mouth. For example, a method of imparting heat resistance by crystallizing the mouth, or a method of forming a multi-layered preformed body composed of a heat-resistant resin and a polyester resin so that a large amount of heat-resistant resin is disposed in the mouth, and the like Attempted.

However, in the method of crystallizing a resin such as polyester disposed in the mouth, the mouth may be whitened or the mechanical strength of the mouth may be reduced.
In many cases, improvement in heat resistance cannot be expected so much. On the other hand, the heat resistance of a bottle obtained by a method using a pre-formed body in which a pre-formed body is multilayered and a large amount of a heat-resistant resin is disposed in a mouth portion is obtained when pasteurizing by a hot shower at 65 to 80 ° C. is performed for a long time. In the case of continuous use under severe hot-fill conditions of 90 ° C. or higher, it is not sufficient.

Therefore, a method for improving the heat resistance of the mouth of the bottle by forming an annular insert member made of resin having good heat resistance in advance and disposing the insert in the mouth of the preform. Are being considered.

[0007]

However, in a biaxial stretch blow-molded bottle in which an insert member made of a resin or the like having excellent heat resistance is arranged at the mouth, the insert member provided at the mouth is made of a polyester resin. Although it is structured to be attached to the mouth of the bottle body, the heat-resistant resin and the polyester resin generally have poor adhesion in many cases. The adhesion to the mouth is not good. For this reason, it is difficult to prevent the detachment of the insert member.

Accordingly, an object of the present invention is to solve the above-mentioned disadvantages, to prevent the insert member from coming off the mouth, and
An object of the present invention is to provide a preform and a heat-resistant bottle whose mouth has good heat resistance.

[0009]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventor has arranged an annular insert member made of a heat-resistant material on the outer peripheral portion of the mouth of the preform, and A surface where the insert member is joined to the inner peripheral portion of the mouth (hereinafter referred to as an inner surface of the insert member) is a tapered surface that expands upward, and the inner peripheral portion of the mouth portion
By configuring in the mainly heat-resistant resin, even without providing a special uneven portion on the insert member surface can prevent separation of the insert member and the heat resistance of the mouth it has found Rukoto guaranteed. That is, the preform of the present invention
Mouth, body and bottom having a ridge and a support ring
Part of the preformed body, the outer peripheral portion of the mouth portion
An annular insert made of heat-resistant material is
And the inner surface of the insert member faces upward.
Has a tapered surface that expands, and
The inner periphery of the mouth is mainly made of heat-resistant resin
And

Another aspect of the present invention is a preform having a mouth, a body, and a bottom having a thread portion and a support ring portion, wherein the outer periphery of the mouth is made of a heat-resistant material. An annular insert member is provided integrally, and the inner surface of the insert member is a tapered surface that expands upward, and the insert member is formed from at least one through hole. It is characterized by having a detent part.

[0011] The heat-resistant bottle of the present invention is characterized in that the preformed body is formed by biaxially stretch blow molding.

Hereinafter, the present invention will be described in detail. First, the material used for the preform of the present invention will be described. As a material for forming the insert member arranged on the outer peripheral portion of the mouth of the preform of the present invention, a material having excellent heat resistance is used. Examples of such heat-resistant materials include (1) a blend polymer of polyarylate and polyethylene terephthalate, (2) a blend polymer of polycarbonate and polyethylene terephthalate, (3) a copolymer of thermoplastic polyester and polyarylate, and a polycarbonate. ,(Four)
Aromatic polycarbonate, (5) copolymer of methyl methacrylate and glutarimide, (6) heat-resistant copolyester, (7) crystallized polyethylene terephthalate and
(8) Blend resins of inorganic fillers such as mica and glass may be used alone or in combination.

Specifically, U polymers U8400, U8450,
U8500, U8600 (made by Unitika Ltd.), J320 (made by Mitsui Petrochemical Industries, Ltd.), Panlite (made by Teijin Ltd.), K-MAX T-240, T-150 (made by Sumitomo Chemical Haas Co., Ltd.) and Thermex PCTA6761 (manufactured by Eastman Kodak Co., Ltd.) or the like can be used. Preferably U polymers are used.

In the main body of the preformed body of the present invention, the inner peripheral part of the mouth and the upper part of the trunk near the mouth are mainly made of heat-resistant resin for the purpose of increasing the heat resistance of the whole mouth of the bottle. It consists of . Specifically, the inner peripheral portion of the mouth mainly made of a heat-resistant resin is (a) co-injected with polyethylene terephthalate and one or more of the resins (1) to (6) forming the insert member. (B) Crystallized polyethylene terephthalate layer, or (c)
The insert member is formed by molding a blend of one or more of the resins (1) to (6) with polyethylene terephthalate.

In the case of the multilayer structure (a), the layer in contact with the insert member is made of one or more of the above-mentioned resins (1) to (6), and the resin composition of the inner layer is the resin of the insert. When the composition is close to the composition, the adhesion between the insert member and the main body can be enhanced. Similarly, above
When the resin composition of the blend (c) is close to the resin composition of the insert member, the adhesion between the insert member and the main body can be improved.

In the case of the multi-layer structure (a), if the inner layer of the mouth is made of a heat-resistant resin, the heat resistance to hot fill can be improved.

The body and bottom of the molded body are made of a polyester resin generally used for bottles, preferably polyethylene terephthalate. However, in order to increase the heat resistance of the whole molded body, it is partially heat-resistant. Resin (preferably the same as that used for the inner periphery of the mouth)
For example, a heat-resistant resin and polyethylene terephthalate may be co-injected to form a multilayer structure integrally with the mouth of the main body.

The heat-resistant material used in the present invention includes:
Stabilizers, pigments, antioxidants, heat deterioration inhibitors, ultraviolet light deterioration inhibitors, antistatic agents within a range that does not impair the purpose of the present invention,
An appropriate amount of additives such as an antibacterial agent and other resins can be added.

Next, the structure of the preform of the present invention will be described. FIG. 1 is a schematic sectional view showing a preform according to one embodiment of the present invention. The preform 1 includes a mouth portion 11 having a thread portion 15a and a support ring portion 14, a body portion 12, and a bottom portion 13, and an insert member 15 made of a heat-resistant resin is arranged on an outer peripheral portion of the mouth portion 11. Have been.

The insert member 15 extends from the upper end of the mouth to the lower end of the support ring 14, and has a threaded portion 15
a. The surface 17 where the insert member 15 is joined to the inner peripheral portion 16 of the mouth (hereinafter referred to as the inner surface of the insert member 15) is basically a cylindrical surface, but extends from the lower end of the support ring 14 to the upper end of the mouth. It has a tapered surface that expands upward. By making the inner surface 17 of the insert member 15 such a tapered surface, it is possible to prevent the mouth of the insert member 15 from being detached from the inner peripheral portion 16.

FIG. 2 is a partial sectional view showing the vicinity of a mouth of a preform 2 according to another embodiment. This preform 2
As in the preform 1 shown in FIG. 1, an insert member 25 having a threaded portion 25a is arranged on the outer peripheral portion of the mouth, and a tapered surface such that an inner surface 27 of the insert member 25 expands upward. Has become. However, in this embodiment, the lower end of the insert member 25 extends only partway through the support ring 24. The end surface of the flange-shaped lower portion of the insert member 25 is flat, and the inner peripheral portion 26
Adhere to each other to form a support ring 24. When the support ring 24 has such a structure, breakage or the like due to stress applied when the bottle is supported at the time of filling or transporting the contents can be prevented.

FIGS. 3 to 5 show examples of the AA cross section of the preform 1 shown in FIG. As shown in FIG. 3, the circumferential direction of the inner surface 17 of the insert member 15 is basically circular, but the inner surface 17 extends in the circumferential direction, and at least one or more flat detent portions ( 38). By providing the rotation preventing portion 38 extending in the circumferential direction on the inner surface 17 of the insert member 15, rotation of the insert member 15 following the plug at the time of opening and closing of the plug can be prevented.

Preferably, one detent 38 has a surface spread of about 45 ° or more. If the surface spread is less than 45 °, the effect of preventing rotation is insufficient, while if it exceeds 45 °, the adhesiveness between the insert member 15 and the inner peripheral portion 16 of the mouth is reduced. FIG. 3 shows an example in which one detent portion 38 is provided, but a plurality of detent portions 48 may be provided on the entire circumference as shown in FIG. Providing a plurality of detent portions in this way can enhance the prevention of rotation of the insert member.

In FIGS. 3 and 4, a flat detent portion (flat portion) is illustrated, but as shown in FIG. 5, a curved detent portion extending in the circumferential direction is provided on the inner surface of the insert member 15. 58 can also be provided. In particular, as shown in FIG.
When a plurality of curved detent portions 58 having different curvatures are connected along the entire inner surface to make the entire periphery elliptical, it is possible to enhance the prevention of rotation of the insert member when the plug is opened and closed.

Although FIGS. 3 to 5 have been described as the preformed body 1 shown in FIG. 1, they can be considered as the BB cross section of the preformed body 2 shown in FIG.

FIG. 6 is a partial sectional view showing the vicinity of the mouth of a preform 6 according to still another embodiment. In this preformed body 6, an insert member 65 having a threaded portion 65a is arranged on the outer peripheral portion of a mouth, similarly to the preformed bodies 1 and 2 shown in FIGS. Although it has a tapered surface, at least one or more through-holes 62 are formed in the insert member 65 as detent portions. Here, FIG. 7 shows a CC cross section of the preform 6 shown in FIG. The through-hole 62 is filled with a resin that forms the inner peripheral portion 66 of the mouth during molding. Since the resin occupying the through hole 62 of the insert member 65 is continuous with the resin forming the upper part of the body, the resin occupying the through hole 62 functions as a wedge, so as to rotate the insert member 65 when opening and closing the plug. Can be prevented. In order to enhance prevention of rotation, it is preferable to form a plurality of through holes 62. More preferably, as shown in FIG.
62 are formed symmetrically with respect to the circumferential center.

If the through hole 62 can be formed relatively large, one or both of the contact surfaces 68 and 69 of the through hole 62 may be tapered so as to expand upward. Insert member without taper on 67
65 can be prevented from leaving.

The upper end surface of the insert member 65 is tapered.
When the upper portion of the taper 63 is covered with the inner peripheral portion 66 of the mouth, the end face of the mouth becomes a flat surface without a step, the sealing performance by the plug is improved, and the detachment of the insert member 65 is more reliably performed. Is prevented.

The through hole 62 can be easily manufactured by providing a rod-like body such as a pin in the mold cavity when the insert member 65 is formed.

FIG. 8 is a partial sectional view showing the vicinity of a mouth of a preform 8 according to another embodiment. This preform 8 is, like the preforms 1, 2, and 6 shown in FIGS. 1, 2 and 6, an insert member 85 having a thread portion 85a.
Are arranged on the outer periphery of the mouth, and the inner surface 87 of the insert member 85 is tapered, but the insert member 85 has a projecting portion 851 below. Thus, in the upper part of the torso,
The protrusion 851 of the insert 85 is the inner and outer surface layer of the molded body
When the structure is surrounded by 86, 86, the heat resistance of the upper part of the trunk is further increased. In addition, since the adhesiveness between the insert member 85 and the molded body main portion is enhanced, sufficient internal pressure resistance can be obtained even when the internal pressure increases due to pasteurizing in the case of a beverage containing carbon dioxide gas.

FIG. 9 is a partial sectional view showing the vicinity of a mouth of a preform 9 according to still another embodiment. The shape of the insert member 95 in FIG. 9 is basically the same as the shape of the insert member 85 in FIG. 8, except that a protrusion 951 is provided below. However, in this embodiment, the lower end of the insert member 95 is
Extends only halfway through. The lower end surface of the flange-shaped insert member 95 is flat, and the inner peripheral portion 96 of the mouth is in close contact with this end surface to form a support ring 94. With such a structure of the support ring 94, it is possible to prevent breakage or the like due to stress applied when supporting the bottle at the time of filling or transporting the contents.

By making the inner surface of the insert member tapered so as to expand upward as described above, the insert member can be prevented from being detached from the inner peripheral portion of the mouth portion. In order to further increase the surface roughness, it is preferable to perform a pretreatment such as applying a fine roughening treatment to the surface of the insert member, generating a polar group by corona discharge treatment, or applying an adhesive. As the fine surface roughening treatment, there is a method in which, for example, a grain pattern is formed by etching on the core side of the mold to provide an engraved surface, or a process of increasing the surface roughness by sandblasting is performed.

In the production of the preformed body of the present invention, for example, a mold corresponding to the preformed body is used, the formed body of the insert member described above is arranged on the outer peripheral portion of the mouth of the mold, and then the main body is mounted. It can be formed by injection molding or the like.

A heat-resistant bottle can be obtained by subjecting the preformed article of the present invention to biaxial stretching blow molding.

[0035]

As described in detail above, in the preform of the present invention, an insert member made of a heat-resistant material is arranged on the outer peripheral portion of the mouth, and the inner surface of the insert member is expanded upward. Tapered surface and inside the mouth
Since the peripheral portion is mainly made of heat-resistant resin , the insert member does not come off without forming a special uneven portion on the joining surface between the insert member and the bottle main body ,
In addition, the heat resistance of the mouth is guaranteed .

Furthermore, the provision of the stopper portion around the insert member, thereby preventing rotation of the insert member during the spout opening. Furthermore, when the protrusion is provided below the insert member, the heat resistance and the internal pressure resistance of the upper part of the body of the bottle obtained therefrom can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a preform according to one embodiment of the present invention.

FIG. 2 is a schematic sectional view showing the vicinity of a mouth of a preform according to another embodiment of the present invention.

FIG. 3 is a diagram showing an example of an AA cross section in FIG. 1;

FIG. 4 is a view showing another example of the AA section in FIG. 1;

FIG. 5 is a view showing still another example of the AA cross section in FIG. 1;

FIG. 6 is a schematic sectional view showing the vicinity of a mouth of a preform according to still another embodiment of the present invention.

FIG. 7 is a view showing a cross section taken along line CC of FIG. 6;

FIG. 8 is a schematic sectional view showing the vicinity of a mouth of a preform according to another embodiment of the present invention.

FIG. 9 is a schematic sectional view showing the vicinity of an opening of a preform according to still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Preformed body 11 ... Mouth part 12 ... Body part 13 ... Bottom part 14, 24, 64, 84, 94 ... Support ring part 15, 25, 65, 85, 95 ... · Insert members 15a, 25a, 65a, 85a, 95a ... Threaded portions 16, 26, 66, 86, 96 ... Inner peripheral portion of mouth 17, 27, 67, 87, 97 ... Insert members Inner surface 38, 48, 58 ・ ・ ・ Detent part 62 ・ ・ ・ Through hole 63 ・ ・ ・ Taper of upper end surface of insert member 68, 69 ・ ・ ・ Junction surface of through hole 851, 951 ・ ・ ・ Protrusion

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-41 (JP, A) JP-B-60-17693 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29B 11/00-11/16 B29C 49/00-49/80

Claims (8)

(57) [Claims] 1. A preformed body comprising a mouth, a body, and a bottom having a thread portion and a support ring portion, and an annular insert member made of a heat-resistant material is integrally formed on an outer periphery of the mouth. The inner surface of the insert member is a tapered surface that expands upward.
And the inner peripheral portion of the mouth is mainly made of heat-resistant resin
A preform, characterized by comprising: 2. The preform according to claim 1, wherein
A preform, wherein an inner surface of the insert member has at least one detent portion extending in a circumferential direction. 3. The preform according to claim 2, wherein
The preform is characterized in that the detent portion is a flat portion formed on at least a part of the inner surface. 4. The preform according to claim 1 , wherein
The insert member includes at least one through hole
A preform having a detent portion . 5. The preform according to claim 1, wherein said insert member has a downwardly projecting portion. 6. A preform comprising a mouth, a body, and a bottom having a thread portion and a support ring portion, wherein an annular insert member made of a heat-resistant material is integrally formed on an outer peripheral portion of the mouth. The inner surface of the insert member has a tapered surface that expands upward, and the insert member has a detent portion formed of at least one through hole. Preform. 7. The preform according to claim 6, wherein
The insert member has a protrusion below.
Preform. 8. claims 1 to 7 or the preform biaxially stretch blow molded heat-resistant bottle comprising a description.