JP2018052613A - Plastic bottle and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic bottle capable of increasing the degree of freedom of printed contents to be applied to a shrinkable film and a method of manufacturing the plastic bottle.SOLUTION: A bottle main body 10 having a mouth portion 11, a shoulder portion 12, a trunk portion 20, and a bottom portion 30 is prepared. Next, a shrinkable film 40 which is a heat shrinkable film or a stretch film is provided around the bottle main body 10. Then, by printing on the surface of the shrinkable film 40 by an inkjet method, an inkjet printing layer 43 containing variable information is formed.SELECTED DRAWING: Figure 1

Description

  The present invention mainly relates to a plastic bottle for storing a liquid content of food and drink and a method for producing the same.

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

  In general, in a conventional plastic bottle, after the bottle body is filled with contents, various types of labels for displaying the contents and the like are attached to the bottle body and then sold as products. For such plastic bottles with labels, a bottle-shaped heat-shrinkable film label (shrink label) is loaded into the bottle body and then heat-shrinked, or a tube-shaped elastic film label (stretch label) is stretched to form a bottle body. It is manufactured by loading the

JP 2004-250040 A

  However, in a conventional plastic bottle with a label, a heat shrinkable film label or a stretchable film label is printed on a heat shrinkable film label or a stretchable film label in advance by a printing method such as gravure printing. It is common to provide an adhesive film label or a stretchable film label on the bottle body. For this reason, in the conventional plastic bottle, there exists a problem that the freedom degree of the printing content given to a heat-shrinkable film label and a stretchable film label will be restrict | limited.

  The present invention has been made in consideration of such points, and an object of the present invention is to provide a plastic bottle capable of increasing the degree of freedom of printing contents applied to a shrinkable film and a method for producing the same.

  The present invention relates to a method for producing a plastic bottle, the step of preparing a bottle body having a mouth portion, a shoulder portion, a body portion, and a bottom portion, and a heat shrinkable film or a stretch film around the bottle body. Production of a plastic bottle comprising: a step of providing a shrinkable film; and a step of forming an ink jet printing layer containing variable information by printing on the surface of the shrinkable film by an ink jet method. Is the method.

  The present invention is the method for producing a plastic bottle, further comprising a step of providing a protective layer on the ink jet printing layer after the step of forming the ink jet printing layer.

  The present invention is the method for producing a plastic bottle, wherein the shrinkable film is preliminarily printed to form a preprinted layer.

  The present invention is the method for producing a plastic bottle, wherein the inkjet printing layer is formed at a position different from the preprinted layer.

  The present invention is the method for producing a plastic bottle, wherein the inkjet printing layer is formed so as to overlap the preprinted layer.

  The present invention relates to a plastic bottle, a bottle body having a mouth portion, a shoulder portion, a trunk portion, and a bottom portion, and a shrinkable film provided around the bottle body and being a heat shrinkable film or a stretch film. A plastic bottle comprising an inkjet printing layer formed on the surface of the shrinkable film and including variable information.

  According to the present invention, a shrinkable film, which is a heat shrinkable film or a stretch film, is provided in advance around the bottle body, and then the surface of the shrinkable film is printed by an ink jet method to form an ink jet printing layer. Form. For this reason, the printing content can be freely set by setting the printing apparatus for inkjet printing, and the degree of freedom of the printing content applied to the shrinkable film can be increased.

FIG. 1 is a partial vertical sectional view showing a plastic bottle according to an embodiment of the present invention. FIG. 2 is a horizontal sectional view (sectional view taken along line II-II in FIG. 1) showing a plastic bottle according to an embodiment of the present invention. 3A to 3G are schematic views showing a method for manufacturing a plastic bottle. 4A to 4D are schematic views showing a method for producing a plastic bottle. FIG. 5 is a partial vertical sectional view showing a plastic bottle according to a modification (Modification 1) of the present embodiment. FIG. 6 is a partial vertical sectional view showing a plastic bottle according to a modified example (modified example 2) of the present embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 4 are views showing an embodiment of the present invention.

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

  FIG. 1 shows a plastic bottle 10B with contents (hereinafter simply referred to as a plastic bottle 10B), which is a product filled with contents such as beverages and sealed. The plastic bottle 10B includes a square bottle body 10 made of a plastic material, a shrinkable film 40 that is a heat-shrinkable film or a stretch film provided around the bottle body 10, and a cap attached to the bottle body 10. 18. The bottle body 10 is filled with a content L that is a liquid such as a beverage.

  Among these, the bottle body 10 includes a mouth portion 11, a neck portion 13 provided below the mouth portion 11, a shoulder portion 12 provided below the neck portion 13, and a trunk portion 20 provided below the shoulder portion 12, The bottom part 30 provided below the trunk | drum 20 is provided. A cap 18 is attached to the mouth portion 11.

  On the other hand, the shrinkable film 40 is mounted in a contracted state with respect to the outer surface of the bottle body 10.

  Next, the bottle body 10 will be described in detail. As described above, the bottle main body 10 includes the mouth portion 11, the neck portion 13, the shoulder portion 12, the trunk portion 20, and the bottom portion 30.

  Of these, the mouth portion 11 has a screw portion 14 to which the cap 18 is screwed and a flange portion 17 provided below the screw portion 14. The shape of the mouth portion 11 may be a conventionally known shape.

  The neck portion 13 is located between the flange portion 17 and the shoulder portion 12 and has a cylindrical shape having a substantially uniform width. The shoulder portion 12 is located between the neck portion 13 and the trunk portion 20 and has a shape whose width gradually increases from the neck portion 13 side toward the trunk portion 20 side.

  Furthermore, the trunk | drum 20 has a square cylinder shape with a substantially uniform diameter as a whole. Specifically, the body portion 20 has a polygonal cylinder shape such as a rectangular cylinder shape or an octagonal cylinder shape. Or the trunk | drum 20 may have the square cylinder shape which has a horizontal cross section which is not uniform toward the downward direction from upper direction. Further, in the present embodiment, the body portion 20 is not formed with irregularities and has a substantially flat side surface, but is not limited thereto. For example, unevenness such as a panel or a groove may be formed on the body portion 20.

  On the other hand, the bottom portion 30 has a concave portion 31 located in the center and a grounding portion 32 provided around the concave portion 31. The shape of the bottom 30 is not particularly limited, and may have a conventionally known bottom shape (for example, a petaloid bottom shape or a square bottom shape).

  Moreover, the thickness of the bottle main body 10 in the trunk | drum 20 is not limited to this, For example, it can be made thin to about 50 micrometers or more and 250 micrometers or less. Further, the weight of the bottle body 10 is not limited to this, but can be 10 g or more and 20 g or less. Thus, by reducing the thickness of the bottle main body 10, the weight of the bottle main body 10 can be reduced.

  Such a bottle main body 10 can be produced by biaxially stretching blow-molding a preform 10a (described later) produced by injection molding a synthetic resin material. The material of the bottle body 10 is preferably a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), or PC (polycarbonate). The bottle body 10 may be colored in colors such as red, blue, yellow, green, brown, black, and white, but is preferably colorless and transparent in consideration of ease of recycling. Moreover, you may blend and use the various resin mentioned above. Further, a vapor deposition film such as a diamond-like carbon film or a silicon oxide thin film may be formed on the inner surface of the bottle body 10 in order to enhance the barrier property of the container.

  Moreover, the 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. As the intermediate layer, a resin obtained by blending the above-described various resins may be used.

  In addition, by mixing an inert gas (nitrogen gas, argon gas) with the melt of thermoplastic resin, a foam preform having a foam cell diameter of 0.5 μm or more and 100 μm or less is formed, and this foam preform is blow-molded. By doing so, you may produce the bottle main body 10. FIG. Since such a bottle main body 10 contains the foam cell, the light shielding property of the whole bottle main body 10 can be improved.

  Such a bottle main body 10 may consist of bottles with a full capacity of 100 ml or more and 2000 ml or less, for example.

  Next, the shrinkable film 40 will be described. The shrinkable film 40 is attached to the outer surface of the bottle body 10. The shrinkable film 40 may be produced, for example, by forming a sheet-like film into a cylindrical shape and bonding the end portions thereof. The shrinkable film 40 may be adhered to the bottle body 10. Moreover, as shown in FIG. 2, the shrinkable film 40 is provided over the whole circumferential direction so that the bottle main body 10 may be surrounded, and has a substantially square-shaped horizontal cross section.

  In this case, the shrinkable film 40 is provided so as to cover the body 20 of the bottle body 10. However, the shrinkable film 40 may be provided in the whole area or a part of the bottle body 10 other than the mouth part 11. For example, the shrinkable film 40 may be provided so as to cover the neck portion 13, the shoulder portion 12, the trunk portion 20, and the bottom portion 30 except for the mouth portion 11 in the bottle body 10. Furthermore, the shrinkable film 40 is not limited to one, and a plurality of shrinkable films 40 may be provided.

  The thickness of the shrinkable film 40 is not limited to this, but can be set to, for example, about 5 μm or more and 500 μm or less when attached to the bottle body 10.

  As described above, the shrinkable film 40 is composed of a heat-shrinkable film or a stretch film.

  In the case where the shrinkable film 40 is a heat-shrinkable film, the shrinkable film 40 is arranged by heating a heat-shrinkable film formed in a cylindrical shape around the bottle body 10 to match the shape of the bottle body 10. It is formed by heat shrinking. In this case, the material of the heat-shrinkable film is not particularly limited as long as it has printability, and those generally used for shrink films can be used. For example, heat shrinkable film materials include heat shrinkable polyethylene terephthalate film, polystyrene film, polypropylene film, low density polyethylene film, medium density polyethylene film, high density polyethylene film, low density linear polyethylene film, cyclic polyolefin. Polyolefin film formed from resin such as film, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, chlorination Modified polyolefin film formed from resin such as polyethylene or chlorinated polypropylene, film formed from vinyl chloride-vinyl acetate copolymer resin, acrylic resin film, etc. Those of the stacked laminated with wood, nonwoven fabric can be used. The thickness of the heat-shrinkable film is not particularly limited, but is appropriately selected within a range not impairing heat resistance, rigidity, workability when used as a label, appearance, etc., preferably about 5 μm to 70 μm, preferably 15 μm or more. More preferably, it is about 60 μm or less.

  When the shrinkable film 40 is a stretch film, the shrinkable film 40 has a property of self-stretching, that is, stretches when an expansion force is applied, and restores to the original state after releasing the expansion force. In this case, the shrinkable film 40 is expanded in diameter so that the inner diameter of the stretch film formed in a cylindrical shape is slightly larger than the outer diameter of the bottle body 10, and the stretch film is disposed around the bottle body 10 in this state. Then, it is formed by shrinking in accordance with the shape of the bottle body 10 by the elastic restoring force of the stretch film. In this case, the material of the stretch film is not particularly limited as long as it has printability, and examples thereof include polyolefin resins such as polyethylene resins. Examples of the polyethylene resin include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), metallocene polyethylene (linear low density polyethylene obtained by polymerization using a metallocene catalyst), and ethylene-acetic acid. Examples thereof include thermoplastic resins such as vinyl copolymers, ethylene- (meth) acrylic acid ester copolymers, ethylene- (meth) acrylic acid copolymers, and ionomers. These can be used alone or in combination of two or more. The thickness of the stretch film is not particularly limited, but is preferably 10 μm or more and 100 μm or less, more preferably 15 μm or more and 80 μm or less, and particularly preferably 20 μm or more and 50 μm or less.

  The shrinkable film 40 can be peeled off from the bottle body 10 and removed. Specifically, for example, the shrinkable film 40 is excised using a blade or the like, or a cutting line (not shown) is provided in the shrinkable film 40 in advance, and the shrinkable film 40 is cut along the cutting line. It can be peeled off. Thereby, since the shrinkable film 40 on which printing has been performed can be separated and removed from the bottle body 10, the colorless and transparent bottle body 10 can be recycled as in the conventional case.

  By the way, in this Embodiment, the inkjet printing layer 43 containing the variable information by which printing was performed is provided in the outer side of the shrinkable film 40. FIG. As will be described later, the inkjet printing layer 43 is designed or printed by providing a shrinkable film 40 around the bottle body 10 and then printing the surface of the shrinkable film 40 by an inkjet method. Is formed. Although the thickness of the inkjet printing layer 43 is not specifically limited, It is preferable that they are 0.1 micrometer or more and 50 micrometers or less.

  In this case, the ink jet printing layer 43 is provided in a partial region of the shrinkable film 40. However, the present invention is not limited to this, and the inkjet printing layer 43 may be provided over the entire area of the shrinkable film 40. The matter displayed on the ink jet printing layer 43 may be character information or a pattern including variable information that can be changed for each bottle body 10, for example, a bar code or an expiration date. In addition, the variable information may be a product name, a name of the content liquid, a manufacturer, a raw material name, or the like.

  The inkjet printing layer 43 may be, for example, UV curable ink or EB curable ink. Specifically, the ink material constituting the inkjet printing layer 43 includes materials such as a colorant such as a pigment, a solvent, an additive, and a polymerizable monomer. As the polymerizable monomer, a monofunctional or polyfunctional monomer may be used alone or in combination of two or more as required. Specific examples of the monofunctional monomer include cyclohexyl acrylate, tetrahydrofurfuryl acrylate, benzyl acrylate, methylphenoxyethyl acrylate, 4-t-butylcyclohexyl acrylate, caprolactone-modified tetrahydrofurfuryl acrylate, and polyfunctional monomers. Specific examples of dimethylol-tricyclodecane diacrylate, propoxylated bisphenol A di (meth) acrylate, ethoxylated bisphenol A di (meth) acrylate, cyclohexanedimethanol di (meth) acrylate, dimethylol dicyclopentanedi Examples include, but are not limited to, acrylate.

  As shown in FIG. 2, a protective layer (overcoat layer) 44 is provided on the inkjet printing layer 43. The protective layer 44 is provided to protect the ink jet printing layer 43 when an impact or wear is applied from the outside. Therefore, the protective layer 44 is not necessarily provided when the inkjet printing layer 43 is not likely to be peeled off without providing the protective layer 44. Further, the protective layer 44 may be formed by printing by an ink jet method, and is preferably colorless and transparent in order to make the ink jet printing layer 43 easily visible. The protective layer 44 is preferably provided in the same range as the inkjet printing layer 43 or in a wider range than the inkjet printing layer 43 so as to include the inkjet printing layer 43. The thickness of the protective layer 44 is not particularly limited, but may be 0.1 μm or more and 100 μm or less. In FIG. 2, the inkjet printing layer 43 and the protective layer 44 are exaggerated in the thickness direction.

  The material of the protective layer 44 may be, for example, UV curable ink or EB curable ink. Specifically, the ink material constituting the protective layer 44 may be the same material as the polymerizable monomer described above.

The manufacturing method for a plastic bottle and then FIG. 3 (a) ~ (g) and FIG. 4 (a) ~ (d) , a method for manufacturing a plastic bottle 10B.

  First, a preform 10a made of a plastic material is prepared (see FIG. 3A). In this case, for example, the preform 10a may be manufactured by an injection molding method using an unillustrated injection molding machine. Moreover, you may use the preform generally used conventionally as the preform 10a.

  The preform 10a includes a mouth portion 11a, a body portion 20a connected to the mouth portion 11a, and a bottom portion 30a connected to the body portion 20a. Of these, the mouth portion 11 a corresponds to the mouth portion 11 of the bottle body 10 described above, and has substantially the same shape as the mouth portion 11. Moreover, the trunk | drum 20a respond | corresponds to the neck part 13, the shoulder part 12, and the trunk | drum 20 of the bottle main body 10 mentioned above, and has a substantially cylindrical shape. The bottom portion 30a corresponds to the bottom portion 30 of the bottle body 10 described above, and has a substantially hemispherical shape.

  Next, the preform 10a is heated by the heating device 51 (see FIG. 3B). At this time, the preform 10a is heated uniformly in the circumferential direction by the heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a in this heating step may be, for example, 90 ° C. to 130 ° C.

  Subsequently, the preform 10a heated by the heating device 51 is sent to the blow molding die 50 (see FIG. 3C).

  The bottle body 10 is molded using this 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 which are divided from each other (see FIG. 3C). In FIG. 3C, the pair of body molds 50a and 50b are open to each other, and the bottom mold 50c is raised upward. In this state, the preform 10a is inserted between the pair of body molds 50a and 50b.

  Next, as shown in FIG. 3D, after the bottom mold 50c is lowered, the pair of body molds 50a and 50b are closed, and sealed by the pair of body molds 50a and 50b and the bottom mold 50c. A blow mold 50 is formed. Next, air is press-fitted into the preform 10a, and biaxial stretch blow molding is performed on the preform 10a.

  Thus, the preform 10a is shaped into a shape corresponding to the inner surface of the blow molding die 50 in the blow molding die 50, whereby the bottle body 10 is obtained from the preform 10a. During this time, the body molds 50a and 50b are heated to 30 ° C. to 80 ° C., and the bottom mold 50c is cooled to 5 ° C. to 25 ° C.

  Next, as shown in FIG. 3 (e), the pair of body molds 50 a and 50 b and the bottom mold 50 c are separated from each other, and the bottle body 10 is taken out from the blow molding mold 50.

  Subsequently, as shown in FIG. 3 (f), the contents L are filled into the bottle body 10 from the mouth portion 11 of the bottle body 10. Thereafter, as shown in FIG. 3G, the cap 18 is attached to the mouth portion 11 of the bottle body 10.

  Next, as shown to Fig.4 (a), the non-shrinkable cylindrical shrinkable film 40 is prepared, and this is arrange | positioned so that the circumference | surroundings of the bottle main body 10 may be covered. In this case, the non-shrinkable shrinkable film 40 may be produced, for example, by forming a sheet-like film into a cylindrical shape slightly larger than the diameter of the bottle body 10 and bonding the end portions thereof. .

  Next, the unshrinkable shrinkable film 40 is heated to a temperature of, for example, 100 ° C. or more and 200 ° C. or less by a heating device 56 such as a heater (see FIG. 4B). Thereby, the shrinkable film 40 is heat-shrinked and adheres to the surface of the bottle body 10 along the shape of the bottle body 10.

  4A and 4B, the case where the shrinkable film 40 is a heat-shrinkable film has been described as an example. However, the present invention is not limited to this, and the shrinkable film 40 may be a stretch film.

  Next, as shown in FIG. 4C, printing is performed on the surface of the shrinkable film 40 provided around the bottle body 10, thereby forming the ink jet printing layer 43. In this case, the bottle body 10 is first set in a fixed state. Next, for example, an ink jet printer 80 (printing apparatus) is used, and a predetermined design, pattern, or the like is obtained by spraying ink from a direction substantially perpendicular to the shrinkable film 40 provided on one side surface of the bottle body 10. May be printed.

  Next, as shown in FIG. 4D, a protective layer 44 is provided on the inkjet printing layer 43. In this case, the material (protective layer) constituting the protective layer 44 from the direction substantially perpendicular to the shrinkable film 40 provided on one side surface of the bottle body 10 using the above-described ink jet printer 80 (printing apparatus). The protective layer 44 may be formed by spraying a material. In this case, since the printer 80 for forming the protective layer 44 and the printer 80 for providing the inkjet printing layer 43 are the same, the working efficiency can be improved. However, the present invention is not limited to this, and the apparatus for producing the protective layer 44 may be an apparatus different from the printer 80 for forming the ink jet printing layer 43.

  In this manner, a plastic bottle 10B including the bottle body 10, the shrinkable film 40, the contents L, and the cap 18 is obtained.

  As described above, according to the present embodiment, the shrinkable film 40 that is a heat-shrinkable film or a stretch film is provided in advance around the bottle body 10, and then, on the surface of the shrinkable film 40, By performing printing by the inkjet method, the inkjet printing layer 43 including variable information is formed. For this reason, the printing content can be freely set by setting the printing apparatus 80 for inkjet printing, and the degree of freedom of the printing content applied to the shrinkable film 40 can be increased.

  Moreover, according to this Embodiment, the plastic bottle 10B has the bottle main body 10 and the shrinkable film 40 provided in close contact with the outside of the bottle main body 10, and printing is performed using the shrinkable film 40. Is given to. For this reason, since the shrinkable film 40 on which printing has been performed can be separated and removed from the bottle body 10, the colorless and transparent bottle body 10 can be recycled as in the conventional case.

Modification Next, referring to FIG. 5 and FIG. 6, a description will be given of a variation of the plastic bottle according to the present embodiment. 5 and FIG. 6, the same parts as those in the embodiment shown in FIG. 1 to FIG. 5 and 6, the preprinted layer 45 is indicated by shading (gray).

Modification 1
FIG. 5 is a partial vertical cross-sectional view (a diagram corresponding to FIG. 1) showing a plastic bottle 10B according to a modified example (modified example 1) of the present embodiment. In FIG. 5, unlike the embodiment shown in FIGS. 1 to 4, a preprinted layer 45 is formed on the shrinkable film 40 by printing in advance, and the ink jet print layer 43 is formed of the preprinted layer 45. And are formed at different positions. In FIG. 5, the preprinted layer 45 is indicated by shading (gray).

  The preprinted layer 45 is formed on the shrinkable film 40 in advance before the shrinkable film 40 is provided around the bottle body 10. As a printing method for the preprinted layer 45, a gravure printing method, a screen printing method, or the like may be used in addition to the inkjet method. Further, the preprinted layer 45 may be provided on either the front surface side or the back surface side of the shrinkable film 40. In this case, common information such as the product name, the name of the content liquid, the manufacturer, and the raw material name is printed in advance as the preprinted layer 45, and the date and lot number, etc. are printed on the plastic bottle 10B as the ink jet print layer 43. Unique variable information can be printed.

Modification 2
FIG. 6 is a partial vertical sectional view (a diagram corresponding to FIG. 1) showing a plastic bottle 10B according to a modification (Modification 2) of the present embodiment. In FIG. 6, unlike the first modification shown in FIG. 5, the inkjet printing layer 43 is formed at least partially overlapping the preprinted layer 45. In FIG. 6, the preprinted layer 45 is indicated by shading (gray).

  In this case, since the inkjet printing layer 43 is overlaid on the preprinted layer 45, it is possible to give various designs as compared to the case of a single printed layer, and the shrinkable film 40 rich in design. Can be provided. Other configurations are the same as those of the plastic bottle 10B (Modification 1) shown in FIG.

DESCRIPTION OF SYMBOLS 10 Bottle main body 10a Preform 10B Plastic bottle 11 Mouth part 12 Shoulder part 13 Neck part 14 Screw part 17 Flange part 18 Cap 20 Trunk part 30 Bottom part 40 Shrinkable film 43 Inkjet printing layer 44 Protective layer

Claims (6)

In the plastic bottle manufacturing method,
Preparing a bottle body having a mouth, a shoulder, a body, and a bottom;
Providing a shrinkable film that is a heat-shrinkable film or a stretch film around the bottle body;
And a step of forming an ink jet printing layer containing variable information by printing on the surface of the shrinkable film by an ink jet method.   The method for producing a plastic bottle according to claim 1, further comprising a step of providing a protective layer on the inkjet printing layer after the step of forming the inkjet printing layer.   The method for producing a plastic bottle according to claim 1, wherein a preprinted layer is formed on the shrinkable film by printing in advance.   The method for producing a plastic bottle according to claim 3, wherein the inkjet printing layer is formed at a position different from the preprinted layer.   The method for manufacturing a plastic bottle according to claim 3, wherein the inkjet printing layer is formed so as to overlap the preprinted layer. In plastic bottles,
A bottle body having a mouth, a shoulder, a body, and a bottom;
A shrinkable film provided around the bottle body, which is a heat shrinkable film or a stretch film,
A plastic bottle comprising an ink jet printing layer formed on a surface of the shrinkable film and including variable information.

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