JP2007297061A - Flat bottle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat bottle which has no possibility of the expansion and deformation of long side walls. <P>SOLUTION: In a bottle manufactured by the biaxially-oriented blow molding of a bottomed cylindrical preform, a body 3 of the bottle is composed of a flat body combining a pair of short side walls 3c and 3d opposing each other with an interval and a pair of the long side walls connected to the short side walls and also opposing each other with an interval. In addition, a connecting wall 4 connecting these long side walls 3c and 3d at the central part in the width direction toward the upper end of the body from the bottom is formed between the long side walls 3c and 3d. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flat bottle (a bottle having pressure resistance and heat resistance) obtained by biaxially stretching blow-molding a bottomed cylindrical preform, and deformation of the body portion caused by an increase in the internal pressure of the bottle ( This is to surely avoid the bulging deformation).

  A synthetic resin container such as a PET bottle is formed by forming a preform as a raw material by injection molding or extrusion molding, and heating it to a predetermined temperature, or by biaxial stretching blow molding while heating. Finished to the desired external shape.

By the way, especially for bottles that contain carbonated beverages or the like as the contents, it is inevitable that the pressure inside the bottle will increase. Therefore, it is normal to use a body with a round cross section and a smooth surface. (For example, refer to Patent Document 1 and Patent Document 2) In this type of bottle, there is a restriction in terms of design and storage location.
Japanese Patent No. 2994651 Japanese Patent No. 3101375

  The subject of this invention exists in the place which proposes the flat bottle which can be used even when it fills with the content which cannot avoid an internal pressure rising.

The present invention, in a bottle manufactured by biaxial stretch blow molding a bottomed cylindrical preform,
The body of the bottle comprises a pair of short side walls facing each other with a space between them, and a flat body portion combining a pair of long side walls connected to the short side walls and facing each other with a space therebetween,
The flat bottle is characterized in that a connecting wall is provided between the long side walls to connect the walls from the bottom to the top of the body at the center in the width direction.

  In the flat bottle having the above-described configuration, the long side wall is particularly preferably adapted so that the entire region is a substantially flat wall and the short side wall is a curved wall.

  In the present invention, the preform used for the biaxial stretch blow molding has an oval cross section of the body part, and the long side wall part is a rib that connects the long side wall part to each other. Those having the following are preferred.

  In addition, the preform used for forming the biaxially stretched blow extends along the rib on the outer side of the long side wall where the rib is located, and a rib that connects the long side wall of the body part to each other. And what has the recessed part which makes the thickness of the site | part thin and makes a cross-section substantially 8-shaped is still more preferable.

  By providing a connecting wall that connects the long side walls to each other inside the container, the long side wall does not bulge and deform even if the internal pressure of the bottle rises.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
1 (a) to 1 (c) are diagrams showing an embodiment of a flat bottle according to the present invention with respect to its front, side and plane.

  In the figure, reference numeral 1 denotes a mouth portion, 2 denotes a bottom portion, and 3 denotes a body portion that is located between the mouth portion 1 and the bottom portion 2 and forms an internal space of the bottle.

  The body part 3 includes a pair of short side walls 3a, 3b corresponding to each other with a space therebetween, and a pair of long side walls 3c, 3d connected to the short side walls 3a, 3b at both ends and facing each other with a space therebetween. And constitutes a flat body. Here, the short side walls 3a and 3b can be made of curved walls, and the long side walls 3c and 3d can be made of substantially flat walls throughout.

  Reference numeral 4 denotes a connecting wall provided between the long side walls 3c and 3d (see FIG. 1 (c)). The connecting wall 4 connects the long side walls 3c, 3d to each other from the bottom 2 toward the upper end of the body 3 at the center in the width direction of the long side walls 3c, 3d.

  The flat bottle having the above structure can be manufactured by performing biaxial stretch blow molding using a preform as shown in FIGS. 2 (a) to (c) and FIGS. 3 (a) to (c). In this flat bottle, the long side walls 3c and 3d are connected to each other by the connecting wall 4, and even when the contents in which the internal pressure increases are filled, the portion does not swell.

  In the preforms shown in FIGS. 2 (a) to 2 (c) and FIGS. 3 (a) to 3 (c), the cross section of the body portion 3 ′ (see the CC cross section and the DD cross section in FIG. 3) is an ellipse. The rib 4 'is disposed between the long side wall portions 3c' and 3d 'of the body portion 3', and is advantageously adapted to the above-described flat bottle blow molding.

  In particular, the flat bottles as shown in Fig. 1 have a fresh taste in terms of design compared to conventional bottles with a perfect circle and are easy to distinguish from other products. This is particularly convenient when stored in a refrigerator door pocket or carried in a bag.

  The cross section of the flat bottle shall be a track (track ellipse seen in athletics stadium) type as shown in Fig. 1 (c) from the aspect of line appropriateness (alignment state and line pressure resistance).

  FIGS. 4 (a) (b) and 5 (a) (b) are diagrams showing another example of a preform suitable for forming a flat bottle according to the present invention, and numeral 5 in the figure is a rib. On the outside of the long side walls 3c 'and 3d' to which 4 'is connected are recesses (may be grooves) that extend along the ribs 4' and reduce the thickness of the portions.

  If the cross section of the preform used for blow molding of flat bottles is made into a flat shape such as an ellipse, the difference in stretch amount (stretch ratio) between the major axis direction and the minor axis direction can be reduced during blow molding. As a result, the difference in wall thickness can be reduced. In particular, when the recess 5 is provided along the rib 4 ', the preform cross-section has an approximately eight-letter shape, and it becomes easier to form the connecting wall 4 during blow molding (easy to extend). And the thickness of the long side walls 3c, 3d can be made substantially uniform over the entire surface.

  The height L of the preform rib 4 '(see Fig. 3 (a) and Fig. 5 (a)) is the upper end of the body of the bottle after blow molding (excluding the shoulder of the bottle (S in Fig. 1)) It is good to make it the dimension which can ensure the height which reaches to.

  The cross section of the flat bottle can be not only a track ellipse but also a polygonal shape such as a rectangle (rectangle) or a hexagon, and can be changed as appropriate.

  A flat bottle in which the long side wall does not bulge and deform can be stably provided.

(a)-(c) is the figure which showed embodiment of the flat bottle according to this invention by the front, the side surface, and the plane. (a) (b) is the figure which showed the preform suitable for blow molding of the flat bottle shown in FIG. (a) and (b) are views showing a cross section of the preform shown in FIG. (a) and (b) are diagrams showing another preform suitable for blow molding of a flat bottle according to the present invention. (a) and (b) are the figures which showed the cross section of the preform shown in FIG.

Explanation of symbols

1 mouth
2 Bottom
2a Short side wall
3 Torso
3a short side wall
3a 'Short side wall
3b short side wall
3b Short side wall
3c Long side wall
3c 'Long side wall
3d long side wall
3d 'long side wall
4 Connecting wall
4 'rib
5 Recess

Claims (4)

In a bottle manufactured by biaxially stretching blow-molding a bottomed cylindrical preform,
The body of the bottle comprises a pair of short side walls facing each other with a space between them, and a flat body portion combining a pair of long side walls connected to the short side walls and facing each other with a space therebetween,
A flat bottle provided between the long side walls with a connecting wall for interconnecting the walls from the bottom to the top of the trunk at the center in the width direction.   2. The flat bottle according to claim 1, wherein the long side wall comprises a substantially flat wall, and the short side wall comprises a curved wall.   The preform used for the biaxial stretch blow molding has an oval cross section of the body portion, and the long side wall has ribs that connect the long sides to each other. The flat bottle according to claim 1 or 2.   The preform used for forming the biaxially stretched blow extends along the rib on the outer side of the long side wall where the rib is located, and a rib connecting the long side wall of the body part to each other. 3. The flat bottle according to claim 1 or 2, wherein the flat bottle has a concave portion whose thickness is reduced to a substantially eight-shaped cross section.

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