JPH05285943A - Preformed body and heat-resistant bottle - Google Patents

Abstract

PURPOSE:To prevent the separation of an insert component and improve heat resistance of a cap section by disposing a ring heat-resistant insert component on the outer periphery of the cap section of a preformed body for biaxially stretched blow molding provided with a thread and a support ring on the cap section and covering the upper end with the cap section inner peripheral material. CONSTITUTION:A preformed body 1 consists of a cap section 11, a body section 12 and a bottom section 13, and an insert component 15 of heat-resistant resin is disposed on the outer periphery of the cap section 11. The insert component 15 is provided with a thread section 15a and a support ring section 14, and at least one protruding section in an axial direction extending from the upper end of the cap section 11 to the lower end of the support ring 14 is formed in one axial direction protruding section. The inner periphery of the cap section 11 is projected in a manner of covering the upper end of the insert component 15. The separation of the insert component 15 is prevented by said arrangement and also the cap can be protected from starting rotating at the time of opening and closing.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In recent years, polyester bottles have a temperature of 80 to 95 ° C.
The so-called hot fill for filling the liquid of, the carbonated juice, bottles filled with lactic acid bacteria beverage, etc. will be subjected to pasteurizing by hot shower, so that particularly excellent heat resistance is required near the mouth. It became so. This is because in hot fill, the mouth is first exposed to hot liquid, and in pasteurizing with a hot shower it is common to pour the hot shower from above the bottle.

However, in a polyester bottle obtained by ordinary biaxially stretch blow molding, the mouth portion is left unstretched, so that heat resistance cannot be imparted by stretching, and it is necessary to fill a liquid at 80 to 95 ° C. Can not serve.

Under these circumstances, various attempts have been made to impart heat resistance to polyester bottles, especially near the mouth. For example, a method of imparting heat resistance by crystallizing the mouth portion, a method of forming a preform having a multi-layered structure including a heat resistant resin and a polyester resin so as to dispose a large amount of the heat resistant resin in the mouth portion, and the like are available. Is being tried.

However, in the method of crystallizing the resin such as polyester disposed in the mouth, the mouth may be whitened or the mechanical strength of the mouth may be reduced.
On the other hand, even with the method of using a preform in which the preform is multi-layered and a large amount of heat resistant resin is placed in the mouth, pasteurizing with a hot shower of 65 to 80 ° C for a long time or a severe hot of 90 ° C or more It is difficult to obtain heat resistance that can be used continuously under fill conditions.

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

[0007]

However, in a biaxially stretched blow molded bottle in which an insert member made of a resin having good heat resistance is arranged at the mouth, the insert member provided at the mouth is made of polyester resin. Although it is structured to be attached to the mouth of the bottle body, in general, adhesiveness between heat-resistant resin and polyester resin is often not good, and therefore the bottle body of the insert member made of heat-resistant resin Sticking to the mouth is not good. Therefore, it is difficult to prevent the insert member from coming off.

Therefore, an object of the present invention is to solve the above-mentioned inconveniences, to provide a preformed body in which the insert member does not separate from the mouth portion, and the mouth portion has good heat resistance, and a heat resistant bottle comprising the same. That is.

[0009]

As a result of earnest research 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, If at least a part of the inner peripheral portion of the portion covers the upper end portion of the insert member and at least one axial protruding portion is provided at the upper end portion or the lower end portion of the insert member, removal of the insert member and plugging The present invention has been completed by discovering that it is possible to simultaneously prevent the rotation following the above.

That is, the preform of the present invention is a preform having a mouth portion having a screw thread portion and a support ring portion, a body portion, and a bottom portion, and a heat resistant material is provided on the outer peripheral portion of the mouth portion. The annular insert member consisting of is integrally provided, and at least a part of the inner peripheral portion of the mouth portion covers the upper end portion of the insert member, and the insert member is at least the upper end portion or the lower end portion. It is characterized by having one axial protrusion.

The heat-resistant bottle of the present invention is characterized in that the above preform is biaxially stretch blow molded.

The present invention will be described in detail below. First, the materials used for the preform of the present invention will be described. A material having excellent heat resistance is used as a material for forming the insert member arranged on the outer peripheral portion of the mouth of the preform of the present invention. Such heat-resistant materials include (1) blend polymers of polyarylate and polyethylene terephthalate, (2) blend polymers of polycarbonate and polyethylene terephthalate, (3) copolymers of thermoplastic polyester and polyarylate, 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 polymer U8400, U8450,
U8500, U8600 (manufactured by Unitika Ltd.), J320 (manufactured by Mitsui Petrochemical Co., Ltd.), Panlite (manufactured by Teijin Ltd.), Kaymax T-240, T-150 (manufactured by Sumitomo Chemical Haas Co., Ltd.) and THERMEX PCTA6761 (manufactured by Eastman Kodak Co., Ltd.) or the like can be used. U polymers are preferably used.

In the preform of the present invention, the inner peripheral portion of the mouth is preferably formed mainly of a heat resistant resin for the purpose of increasing the heat resistance of the entire mouth of the bottle. Specifically, the inner peripheral portion of the mouth mainly made of heat-resistant resin, (a)
It is composed of a multilayer structure formed by co-injecting heat-resistant resin and polyethylene terephthalate, (b) crystallized polyethylene terephthalate, or (c) formed by molding a blended resin of heat-resistant resin and polyethylene terephthalate. .

The body of the molded body forming the body and the bottom is made of a polyester resin generally used for bottles, preferably polyethylene terephthalate.
For the purpose of enhancing the heat resistance of the entire molded body, it may be partially composed of a heat resistant resin (preferably, the same as that used for the inner peripheral portion of the above-mentioned mouth), for example, a heat resistant resin and polyethylene. A multi-layer structure may be formed by co-injecting terephthalate with the mouth portion.

In the heat-resistant resin used in the present invention,
Stabilizers, pigments, antioxidants, thermal deterioration inhibitors, ultraviolet deterioration inhibitors, antistatic agents, within the range that does not impair the object of the present invention,
Additives such as antibacterial agents and other resins can be added in appropriate amounts.

FIG. 1 is a schematic sectional view showing a preform according to an embodiment of the present invention. The preform 1 is composed of a mouth portion 11, a body portion 12, and a bottom portion 13, and an insert member 15 made of a heat resistant resin is arranged on the outer peripheral portion of the mouth portion 11.

The insert member 15 extends from the upper end of the mouth portion to the lower end of the support ring 14, and has an external thread portion 15
a and a support ring portion 14. In the present invention, 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) may remain cylindrical.

FIG. 2 shows the preform 1 as seen from the opening, and FIG. 3 shows the cross section AA of FIG. As shown in FIG. 2, in this embodiment, at least one axial protruding portion 18 is formed on the upper end portion of the insert member 15.
The protrusions 18 are preferably provided on the upper end of the insert member 15 at equal intervals, and their width and length can be set appropriately.
In the embodiment shown in FIG. 2, the protruding portion 18 reaches the upper end surface of the mouth portion 1, but the length may be halfway. By providing at least one protrusion 18 on the insert member 15, the upper end of the inner peripheral portion 16 (the portion above the upper end of the insert member 15) acts as a retainer for the insert member 15, and the protrusion 18 Exerts an action of preventing rotation of the insert member 15 when opening and closing the spout.

FIG. 4 shows a cross section near the mouth of the preform 4 according to another embodiment of the present invention. As shown in FIG. 4, the insert member 45 has at least one axial protrusion 48 at the lower end. FIG. 5 shows a BB cross section of FIG. Figure 4,
5, parts corresponding to those in FIG. 1 are designated by corresponding numbers. The protrusion 48 may have the same shape as the protrusion 18 shown in FIG. 1 except that it is provided at the lower end of the insert member 45. The inner peripheral portion 46 projecting above the insert member 45 can prevent the insert member 45 from coming off, and by providing at least one protruding portion 48 on the insert member 45, the insert member at the time of opening and closing the spout The rotation of 55 can be prevented.

Incidentally, in order to ensure that the insert member is prevented from coming off the inner peripheral portion of the mouth, corona discharge treatment or the like may be applied to the inner surface of the insert member, or an adhesive may be applied.

A heat-resistant bottle can be obtained by biaxially stretch blow molding the preform of the present invention by a known method.

[0023]

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 portion, and the inner peripheral portion of the mouth portion is covered so as to cover the upper end portion of the insert member. By overhanging, the detachment of the insert member can be prevented. Further, since at least one axial projecting portion is provided at the upper end portion or the lower end portion of the insert member, it is possible to prevent the insert member from rotating when opening / closing the spigot.

Further, if the inner peripheral portion of the mouth portion is mainly made of a heat resistant resin, the mouth portion of the preform is mainly made of a heat resistant material, and the heat resistance of the mouth portion is guaranteed.

[Brief description of drawings]

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

FIG. 2 is a plan view of the preform of FIG. 1 seen from above.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a schematic cross-sectional view showing the vicinity of the mouth of the preform according to another embodiment of the present invention.

5 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 1 ... Preform 11 ... Mouth 12 ... Body 13 ... Bottom 14, 44 ... Support ring 15, 45 ... Insert member 15a, 45a ... Thread 16, 46 ... Inner peripheral portion of mouth (molded body main body) 17, 47 ... Inner surface of insert member 18, 48 ... Projection

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Claims (3)

[Claims] 1. A preformed body comprising a mouth portion having a screw thread portion and a support ring portion, a body portion and a bottom portion, wherein an annular insert member made of a heat resistant material is integrally formed on an outer peripheral portion of the mouth portion. And at least a part of the resin forming the inner peripheral portion of the mouth covers the upper end portion of the insert member, and the insert member has at least one axial protruding portion at the upper end portion or the lower end portion. A preformed body having: 2. The preformed body according to claim 1, wherein
A preform, wherein the inner peripheral portion of the mouth portion is mainly made of a heat resistant resin. 3. A heat resistant bottle obtained by biaxially stretch blow molding the preform according to claim 1 or 2.