JP6070178B2 - Blow molded plastic bottle and method for producing blow molded plastic bottle - Google Patents

Description

  The present invention mainly relates to a blow-molded plastic bottle that contains content liquids such as food and drink, and a method for producing a blow-molded plastic bottle.

  Recently, plastic bottles for storing content liquids such as foods and drinks have become common, and such plastic bottles store content liquids.

  A plastic bottle that contains such a content liquid is manufactured by inserting a preform into a mold and blow-molding it.

  By the way, although content liquids, such as food and drink, are accommodated in a plastic bottle, when a content liquid is high temperature, it may be difficult to hold | grip a plastic bottle. On the other hand, when the content liquid is at a low temperature, dew condensation occurs on the plastic bottle and the appearance is deteriorated.

Patent No. 4239165 Japanese Patent No. 4251351 Japanese Patent No. 4251352

  The present invention has been made in consideration of the above points, and can be easily gripped even when the content liquid is high temperature, and even if the content liquid is low temperature, condensation forms and looks good. An object of the present invention is to provide a blow-molded plastic bottle and a method for producing a blow-molded plastic bottle that are unlikely to deteriorate.

  The present invention is a blow molded plastic bottle obtained by blow molding a surface member inserted in a mold in advance and a preform inserted inside the surface member in the mold, a mouth portion, a shoulder portion And a bottle body having a body portion and a bottom portion, a surface member is provided on an outer surface of the bottle body, and an intermediate member is interposed between the surface member and the bottle body. It is a plastic bottle.

  The present invention is the blow-molded plastic bottle, wherein the intermediate member is formed of a shrink label, and the bottle body is contracted to form a space between the surface member and the bottle body.

  The present invention is the blow molded plastic bottle characterized in that the surface member is provided on the outer surface of the shoulder portion, the trunk portion or the bottom portion of the bottle body.

  The present invention is a blow-molded plastic bottle characterized in that a groove is formed in the horizontal direction in the bottle body and the body part of the surface member.

  The present invention relates to a method of manufacturing a blow molded plastic bottle, the step of inserting a surface member into a mold, and inserting an intermediate member inside the surface member in the mold, and the inside of the intermediate member in the mold And forming a bottle body having a mouth portion, a shoulder portion, a trunk portion, and a bottom portion by inserting the preform into the preform and blow-molding the preform. An intermediate member is interposed between the blow molded plastic bottles.

  The present invention is the blow molded plastic bottle manufacturing method, wherein the intermediate member is formed of a shrink label, and the bottle body is contracted to form a space between the surface member and the bottle body.

  The present invention is the method for producing a blow-molded plastic bottle characterized in that the surface member is provided on the outer surface of the shoulder, body or bottom of the bottle body.

  The present invention is a method for producing a blow-molded plastic bottle, characterized in that a groove is formed in the horizontal direction in the body of the bottle body and the surface member.

  According to the present invention, a blow-molded plastic bottle includes a surface member and a bottle main body formed by blow-molding a preform provided inside the surface member, and the surface member is provided on the outer surface of the bottle main body. Furthermore, an intermediate member is interposed between the surface member and the bottle body. For this reason, even if the content liquid is high temperature, heat is not directly transmitted to the surface member, and the surface member can be easily gripped. Even when the content liquid is at a low temperature, condensation is unlikely to occur on the surface member or the bottle body surface.

FIG. 1 is a front view showing a blow molded plastic bottle according to an embodiment of the present invention. FIG. 2 is a bottom view showing a blow molded plastic bottle according to an embodiment of the present invention. FIG. 3 is a horizontal sectional view of a blow molded plastic bottle according to an embodiment of the present invention. 4A to 4E are views showing a method for manufacturing the blow molded plastic bottle shown in FIG. FIG. 5 is a diagram showing the relationship between the elapsed time and the surface temperature of a blow molded plastic bottle. FIG. 6 is a view showing a modification of the blow molded plastic bottle. 7A to 7E are views showing a method for manufacturing the blow molded plastic bottle shown in FIG.

Embodiment Hereinafter, with reference to the drawings illustrating an embodiment of the present invention. 1 to 5 are views showing an embodiment of the present invention.

  First, an outline of a blow molded plastic bottle according to the present embodiment will be described with reference to FIGS. In the present specification, “upper” and “lower” refer to the upper side and the lower side in a state where the plastic bottle 10 is erected (FIG. 1), respectively.

  The blow-molded plastic bottle 10A shown in FIGS. 1 to 3 is obtained by blow-molding a surface member 40 inserted in advance in a mold 50, which will be described later, and a preform 10a inserted inside the surface member 40. A plastic bottle main body (bottle main body) 10 and an intermediate member 41 interposed between the surface member 40 and the bottle main body 10 are provided. Among these, the bottle main body 10 is produced by preparing the preform 10a obtained by injection molding as described above and subjecting the preform 10a to biaxial stretch blow molding in the mold 50 (FIG. 4 (a)-(e)). Such a plastic bottle main body 10 consists of a bottle with a volume of 450 ml-650 ml, for example.

  The plastic bottle body 10 includes a mouth portion 11, a shoulder portion 12 provided below the mouth portion 11, a trunk portion 20 provided below the shoulder portion 12, and a bottom portion 30 provided below the trunk portion 20. ing.

  On the other hand, the surface member 40 is obtained by preparing the plastic bottle main body 10 and cutting in the horizontal direction at the central portion of the body portion 20 of the plastic bottle main body 10. Further, the surface member 40 is attached in a contact state without being bonded to the outer surface of the plastic bottle body 10. The intermediate member 41 is attached in advance to the inner surface of the surface member 40.

  Next, the plastic bottle body 10 will be described in detail. The body portion 20 of the plastic bottle main body 10 has a cylindrical shape as a whole, and is divided into an upper half portion 20A and a lower half portion 20B via a central horizontal groove 21 located in the center portion in the vertical direction. Yes. A plurality of horizontal grooves 22 to 24 are formed in the upper half 20A and the lower half 20B, respectively.

  The plurality of horizontal grooves 22 to 24 include horizontal grooves having at least two types of depth. Specifically, the horizontal grooves 22 to 24 include a first horizontal groove 22 having a maximum depth, a second horizontal groove 23 having an intermediate depth, and a third horizontal groove having a minimum depth. Direction groove 24. The depth of the central horizontal groove 21 is the same as the depth of the first horizontal groove 22.

  These horizontal grooves 21 to 24 extend along the entire circumference in the circumferential direction of the body portion 20, and the vertical widths thereof are uniform over the entire circumference in the circumferential direction.

  On the other hand, a region of the body portion 20 where the horizontal grooves 21 to 24 are not formed includes a cylindrical surface 25. That is, a cylindrical surface 25 is formed between the horizontal grooves 21 to 24. Thus, the trunk | drum 20 is comprised only from each horizontal direction groove | channels 21-24 and the cylindrical surface 25. FIG.

  The region (cylindrical surface 25) where the horizontal grooves 21 to 24 are not formed has a uniform diameter from directly below the shoulder 12 to directly above the bottom 30. Thereby, when the plastic bottle main body 10 is stored sideways in the vending machine, it can be brought into contact with another adjacent plastic bottle main body 10 in a wide area, so that the trunk portion 20 is deformed in the vending machine. Can be prevented.

  On the other hand, as shown in FIG. 2, the bottom 30 has a circular recess 31 located in the center and radial ribs 32 extending radially from the recess 31. In FIG. 2, the number of the radial ribs 32 is seven, but is not limited thereto, and may be set in a range of, for example, five to eleven. By arranging the radial ribs 32 in this manner, the strength of the bottom portion 30 is increased and the bottom portion 30 is hardly deformed.

  Moreover, although the thickness of the plastic bottle main body 10 in the cylindrical surface 25 of the trunk | drum 20 is not limited to this, For example, it can be made thin to about 50 micrometers-250 micrometers. Further, the weight of the plastic bottle main body 10 is not limited to this, but can be 10 g to 20 g. Thus, by reducing the thickness of the plastic bottle main body 10, it is possible to reduce the weight of the plastic bottle 10.

  Such a plastic bottle main body 10 can be produced by biaxially stretch blow molding a preform 10a produced by injection molding a synthetic resin material. In addition, it is preferable to use a thermoplastic resin, especially PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate) as a material of the preform 10a, that is, the plastic bottle body 10.

  Moreover, the plastic bottle main body 10 can also be formed as a multilayer molded bottle of two or more layers. That is, by extrusion molding or injection molding, for example, the intermediate layer has gas barrier properties and light shielding properties such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate). You may form as a multilayer bottle which has gas barrier property and light-shielding property by extrusion-molding preform 10a which consists of three or more layers as resin which it has (intermediate layer), and carrying out blow molding. Such an intermediate layer is preferably provided in at least the body 20 of the plastic bottle body 10. Further, it is preferable to provide an intermediate layer in the region of the bottom portion 30 excluding the central portion of the bottom portion 30. This is because this portion may cause delamination (delamination) when subjected to an impact such as a case dropping. In order to have gas barrier properties and light shielding properties, a blend bottle in which thermoplastic resins are blended may be formed as well as multilayers.

  Next, the surface member 40 will be described. Since the surface member 40 is obtained by preparing the plastic bottle main body 10 obtained by blow-molding the preform 10a as described above and cutting the central portion of the body portion 20 of the plastic bottle main body 10 in the horizontal direction. The surface member 40 has a substantially cylindrical body portion and a bottom portion.

  The surface member 40 is attached without being bonded to the outer surface of the plastic bottle main body 10, and an intermediate member 41 made of a cylindrical shrink label is interposed between the surface member 40 and the plastic bottle main body 10. Thus, a space 45 is formed between the surface member 40 and the plastic bottle body 10 (see FIG. 3). For this reason, even if the content liquid is high temperature, heat is not directly transmitted to the surface member 40, and the surface member can be easily gripped. Even when the content liquid is at a low temperature, condensation is unlikely to occur on the surface member or the bottle body surface.

  The surface member 40 corresponds to the body part 20 and the bottom part 30 of the plastic bottle main body 10, but may correspond to the body part 20 of the plastic bottle body 10, may correspond to the bottom part 30, and the shoulder part. 12 may be formed.

  Next, the intermediate part 41 which consists of a cylindrical shrink label interposed between the surface member 40 and the plastic bottle main body 10 is demonstrated. As shown in FIGS. 1 to 4A to 4E, the intermediate member 41 made of a cylindrical shrink label presses the outer surface of the plastic bottle body 10 inward to contract. Thus, a relatively large space 45 is formed between the plastic bottle body 10 contracted by the intermediate member 41 and the intermediate member 41 (see FIG. 3).

  Next, the surface member 40 and the intermediate member 41 will be further described. Since the surface member 40 is obtained by preparing the plastic bottle main body 10 obtained by blow-molding the preform 10a as described above and cutting the central portion of the body portion 20 of the plastic bottle main body 10 in the horizontal direction. The surface member 40 has a substantially cylindrical body portion and a bottom portion.

  Further, the intermediate member 41 is formed of a shrink label and is shrunk when heated to press the plastic bottle body 10.

  The surface member 40 is attached to the outer surface of the plastic bottle body 10 without being bonded, and a space 45 is formed between the surface member 40 and the plastic bottle body 10 contracted by the intermediate member 41.

  In this case, since the plastic bottle main body 10 is contracted by the intermediate member 41, a relatively large space 45 can be reliably formed between the surface member 40 and the plastic bottle main body 10 (see FIG. 3).

  Next, a method for manufacturing the blow molded plastic bottle 10A will be described with reference to FIGS.

  The blow molded plastic bottle 10 </ b> A is molded using a blow mold 50. In this case, the blow mold 50 includes a pair of body molds 50a and 50b and a bottom mold 50c which are divided from each other (see FIG. 4A).

  Next, as shown in FIG. 4B, the surface member 40 is adsorbed to the bottom mold 50c, and the surface member 40 adsorbed to the bottom mold 50c is inserted between the pair of body molds 50a and 50b. Is done. In this case, an intermediate member 41 made of a shrink label is attached to the inner surface of the surface member 40. In FIG.4 (b), between a pair of trunk | drum metal mold | die 50a, 50b is mutually open.

  In this state, the preform 10a is inserted between the pair of body molds 50a and 50b from below (see FIG. 4C).

  Next, as shown in FIG. 4 (d), the pair of body molds 50a and 50b are closed, and the blow molding mold 50 sealed by the pair of body molds 50a and 50b and the bottom mold 50c is configured. Is done. Next, air is press-fitted into the preform 10a, and blow molding is performed on the preform 10a.

  As a result, the plastic bottle body 10 is obtained from the preform 10 a in the blow molding die 50. During this time, the blow mold 50 is heated to a predetermined temperature.

  In the blow mold 50, the outer surface of the plastic bottle body 10 is pressed against the inner surface of the surface member 40. In this case, the surface member 40 is attached in a contact state without adhering to the outer surface of the plastic bottle main body 10.

  And the intermediate member 41 located inside the surface member 40 is heated and contracts, and the plastic bottle main body 10 is also contracted by the intermediate member 41. As a result, a relatively large space 45 is formed between the surface member 40 and the plastic bottle body 10 (see FIG. 3).

  Thus, the blow molding provided with the plastic bottle main body 10, the surface member 40 provided on the outer surface of the plastic bottle main body 10, and the intermediate member 41 interposed between the surface member 40 and the plastic bottle main body 10. A plastic bottle 10A is obtained.

  Next, as shown in FIG. 4 (e), the pair of body molds 50 a and 50 b and the bottom mold 50 c are separated from each other, and the blow molded plastic bottle 10 </ b> A is taken out from the blow mold 50.

Example (Test A)
Next, specific examples of the present invention will be described. First, a blow molded plastic bottle (double bottle) 10A having a plastic bottle main body 10 according to the present invention, a surface member 40, and an intermediate member 41 interposed between the bottle main body 10 and the surface member 40 is prepared ( A plastic bottle body (single bottle) as a comparative example having no surface member was prepared.

  Next, both the blow-molded plastic bottle according to the present invention and the plastic bottle body as a comparative example were filled with water at 25 ° C. so that the bottle empty dimension was 20 ml, and cooled in an environment at 5 ° C. for 24 hours.

  The cooled double bottle according to the present invention and a single bottle as a comparative example were placed in an environment of 25 ° C. and 40% RH and left to stand to confirm dew condensation.

  As a result, in the blow-molded plastic bottle (double bottle) according to the present invention, the surface of the surface member 40 and the surface of the portion of the plastic bottle main body 10 (the lower portion of the plastic bottle main body 10) located inside the surface member 40. Condensation hardly occurred on both sides, and the content liquid could be confirmed from the outside through the surface member 40 and the plastic bottle body 10 inside thereof.

  That is, in the blow molded plastic bottle 10A according to the present invention, since the space 45 is formed between the surface member 40 and the plastic bottle body 10, the temperature difference between the surface of the plastic bottle body 10 and the content liquid is small. In addition, since there is almost no inflow of moisture from the gap between the surface member 40 and the plastic bottle body 10, dew condensation hardly occurs on the surface of the plastic bottle body 10. Further, the space 45 can increase the temperature difference between the surface of the surface member 40 and the surface of the plastic bottle main body 10, and therefore, the surface of the surface member 40 is less likely to cause condensation.

  On the other hand, in the plastic bottle body (single bottle) according to the comparative example, dew condensation occurred on the entire surface, and the content liquid could not be confirmed.

(Test B)
Both the double bottle according to the present invention and the single bottle as a comparative example were filled with 25 ° C. water so that the bottle empty size was 20 ml, and cooled in an environment of −20 ° C. for 24 hours.

Both the cooled double bottle and the single bottle were exposed to a 20 ° C. environment, and the surface temperature was measured by thermography over time. In addition, the elapsed time during which the inside completely melted was measured. The results are shown in Table 1 and FIG.

  As shown in Table 1 and FIG. 5, among the blow molded plastic bottles (double bottles) according to the present invention, the surface temperature of the surface member 40, that is, the surface of the double portion, is not greatly reduced from the beginning. It is almost constant. This is because an air layer 43 is formed between the surface member 40 and the plastic bottle body 10, and this air layer 43 exhibits a heat insulating effect.

  In addition, the surface temperature of the blow molded plastic bottle (double bottle) according to the present invention on the upper part surface where the surface member 40 is not present, that is, the surface of the single part, greatly decreases at first (around −20 ° C.), and as time passes. It has risen to near room temperature.

  On the other hand, in the plastic bottle body (single bottle) as a comparative example, the same behavior as that of the single part of the double bottle, that is, its surface temperature is greatly reduced at first (near -20 ° C), and rises to near room temperature as time passes. doing.

Modified Example of the Invention Next, a modified example of the present invention will be described with reference to FIGS. 6 and 7A to 7E.

  The modification shown in FIGS. 6 and 7A to 7E does not have a body portion and a bottom portion as the surface member 40 but uses a cylindrical surface member 40. As shown in FIG. 6, the surface member 40 extends from the central portion to the lower portion of the body portion 20 of the plastic bottle main body 10, but does not reach the bottom portion 30. 6 and FIGS. 7A to 7E, the other configurations are substantially the same as those of the embodiment shown in FIGS.

  In the modification shown in FIGS. 6 and 7A to 7E, the same parts as those in the embodiment shown in FIGS.

  Next, the surface member 40 will be described. The surface member 40 is obtained by preparing the plastic bottle body 10 obtained by blow molding the preform 10a and cutting the body portion of the plastic bottle body 10 in two horizontal directions. It has a substantially cylindrical body. An intermediate member 41 made of a cylindrical shrink label is interposed between the surface member 40 and the plastic bottle main body 10, and the intermediate member 41 is heated and contracts to press the plastic bottle main body 10.

  The surface member 40 is attached to the outer surface of the plastic bottle body 10 without being bonded, and a space 45 is formed between the surface member 40 and the plastic bottle body 10 contracted by the intermediate member 41.

  Next, a manufacturing method of the blow molded plastic bottle 10A will be described with reference to FIGS.

  The blow molded plastic bottle 10 </ b> A is molded using a blow molding die 50. In this case, the blow mold 50 includes a pair of body molds 50a and 50b and a bottom mold 50c that are divided from each other (see FIG. 7A).

  Next, as shown in FIG. 7B, the surface member 40 is adsorbed on the inner surface of one of the barrel part molds 50a. In this case, an intermediate member 41 made of a shrink label is attached to the inner surface of the surface member 40. In FIG. 7B, the pair of body molds 50a and 50b are open to each other.

  In this state, the preform 10a is inserted between the pair of body molds 50a and 50b from below (see FIG. 7C).

  Next, as shown in FIG. 7 (d), a pair of body molds 50a and 50b are closed, and a blow molding mold 50 sealed by a pair of body molds 50a and 50b and a bottom mold 50c is configured. Is done. Next, air is press-fitted into the preform 10a, and blow molding is performed on the preform 10a.

  As a result, the plastic bottle body 10 is obtained from the preform 10 a in the blow molding die 50. During this time, the blow mold 50 is heated to a predetermined temperature.

  In the blow mold 50, the outer surface of the plastic bottle body 10 is pressed against the inner surface of the surface member 40. In this case, the surface member 40 is attached in a contact state without adhering to the outer surface of the plastic bottle main body 10.

  And the intermediate member 41 located inside the surface member 40 is heated and contracts, and the plastic bottle main body 10 is also contracted by the intermediate member 41. As a result, a relatively large space 45 is formed between the surface member 40 and the plastic bottle body 10 (see FIG. 3).

  Thus, the blow molding provided with the plastic bottle main body 10, the surface member 40 provided on the outer surface of the plastic bottle main body 10, and the intermediate member 41 interposed between the surface member 40 and the plastic bottle main body 10. A plastic bottle 10A is obtained.

  In the above-described embodiment, the example in which the surface member 40 is obtained by cutting the central portion of the body portion 20 of the plastic bottle main body 10 obtained by blow molding in the horizontal direction has been shown. The surface member 40 may be formed by cutting the body portion 20 of the main body 10 in an oblique direction or on a curved surface.

  Alternatively, the surface member 40 may be formed of a material other than plastic, such as wood or metal. Further, the surface member may be formed by a method other than blow molding, for example, injection molding, inflation method or extrusion molding.

DESCRIPTION OF SYMBOLS 10 Plastic bottle 10A Plastic bottle main body 10a Preform 11 Mouth part 12 Shoulder part 20 Body part 20A Upper half part 20B Lower half part 30 Bottom part 40 Surface member 41 Intermediate member 43 Air layer 45 Space 50 Blow-molding mold 50a, 50b Mold 50c Bottom mold

Claims (3)

In the method of manufacturing a blow molded plastic bottle,
Inserting a surface member into the mold and inserting an intermediate member inside the surface member in the mold; and
A step of forming a bottle body having a mouth portion, a shoulder portion, a body portion, and a bottom portion by inserting a preform inside the intermediate member in the mold and blow-molding the preform. ,
An intermediate member is interposed between the surface member and the bottle body ,
A method for producing a blow-molded plastic bottle, wherein the intermediate member comprises a shrink label, and the bottle body is contracted to form a space between the surface member and the bottle body. Surface member shoulder portion of the bottle body, barrel or claim 1 method for producing a blow molded plastic bottle, wherein a provided on the outer surface of the bottom portion. The body of the bottle body and the surface member, a manufacturing method of a blow molded plastic bottle according to any one of claims 1 or 2, characterized in that the groove in the horizontal direction are formed.

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