JP5401151B2 - Plastic bottle - Google Patents

Description

  The present invention relates to improvements in plastic bottles.

  Plastic bottles are used as bottle containers for storing liquid products such as shampoos, rinses, body soaps, kitchen detergents, liquid clothing detergents, and softeners. Widely used in products.

  A plastic bottle is generally formed by blow molding a synthetic resin material to form a bottle main body and covering the bottle main body with a cap. Specifically, the production of the bottle body of this plastic bottle includes a method in which a cylindrical molding material called a parison is melted, placed in a mold, blown into the interior and inflated, and simultaneously cooled and molded. Used.

  By the way, plastic bottles with a large internal capacity (for example, internal capacity of 2 to 6L) are often oval in the cross-sectional shape of the bottle body and require a handle from the viewpoint of handling. It is common to be manufactured.

  However, in the large-capacity plastic bottle described above, if the bottom of the bottle body is deformed (swelled) due to its own weight, the erecting stability is reduced or the appearance of the bottle is reduced when displayed on the storefront. It is necessary to prevent them from appearing worse.

  In conventional plastic bottles, in order to prevent the deformation of the bottom surface of the bottle body described above, the amount of resin is increased, the bottle body is formed thicker, or a resin material with high rigidity is used. To prevent the deformation of the bottom surface. However, such a measure causes an increase in production cost.

  On the other hand, in the conventional plastic bottle, in order to improve its upright stability, the bottom of the bottle main body is raised by raising the center of the bottom surface of the bottle main body or by providing a plurality of ribs on the raised portion. (See, for example, Patent Documents 1 and 2).

  However, as the shape of the bottom surface of such a bottle body becomes complicated, when the bottle body is taken out from a mold that is divided along the parting line after blow molding, the releasability of the bottle body becomes worse. Will cause serious problems. In particular, such a tendency becomes more remarkable when an attempt is made to increase the bottom-up dimension on the bottom surface of the bottle body. On the other hand, if the mold structure is complicated in order to cope with such a problem, the production cost will increase.

Japanese Patent Laid-Open No. 1-99949 JP-A-6-247433

  The present invention has been proposed in view of such a conventional situation, and without deforming the bottom surface of the bottle main body without forming the bottle main body thickly or using an expensive resin material with high rigidity. And to provide a plastic bottle that can further improve productivity by improving the releasability of the bottle body from the mold that is divided along the parting line after blow molding Objective.

In order to achieve this object, the invention according to claim 1 is a plastic bottle in which a bottle main body is formed by blow molding, wherein the bottle main body has a bottom raised portion with the center portion of the bottom raised, and a bottom raised portion. A leg portion that surrounds the periphery and a rib portion that protrudes from the bottom-up portion toward the inside of the bottle body, and the rib portion is extended in a direction perpendicular to the parting line of the bottle body. together leading to parts, the provided side by side a plurality in a direction perpendicular to the extending direction, the rib portion, the Rukoto which have a shape which gradually width increases toward the leg from the parting line of plastic bottles, wherein is there.

  The invention according to claim 2 is the plastic bottle according to claim 1, characterized in that the bottom-up portion forms a flat surface between the rib portions.

  As described above, in the plastic bottle according to the present invention, the rib portion that protrudes from the bottom-up portion of the bottle body toward the inside of the bottle body is extended in a direction orthogonal to the parting line of the bottle body. Along with the legs, the bottle body is provided side by side in the direction orthogonal to the extension direction, so that the bottle body can be made thick without using a thick and expensive expensive resin material. It is possible to suppress the deformation of the bottom surface of the bottle body while sufficiently ensuring the rigidity of the bottom surface of the bottle body. In addition, in this plastic bottle, the bottom of the bottle body is shaped like this, so that the release of the bottle body from the mold that is divided along the parting line after blow molding is improved and produced. It is possible to further improve the performance.

FIG. 1 is a perspective view showing an example of a plastic bottle to which the present invention is applied. FIG. 2 shows an example of the bottom shape of the bottle body, (a) is a perspective view of the bottle body viewed from the bottom side, (b) is a bottom view of the bottle body, and (c) is a line segment X _1. it is a cross-sectional view at the bottom of the bottle body by -X 1 _'. FIG. 3 shows another example of the shape of the bottom surface of the bottle body, (a) is a perspective view of the bottle body viewed from the bottom surface side, (b) is a bottom view of the bottle body, and (c) is a line segment X. it is a cross-sectional view at the bottom of the bottle body by ₂ -X 2 _'. 4A and 4B show another example of the bottom shape of the bottle main body. FIG. 4A is a perspective view of the bottle main body viewed from the bottom side, FIG. 4B is a bottom view of the bottle main body, and FIG. it is a cross-sectional view at the bottom of the bottle body by ₃ -X 3 _'. FIG. 5 shows another example of the bottom shape of the bottle body, (a) is a perspective view of the bottle body viewed from the bottom surface side, (b) is a bottom view of the bottle body, and (c) is a line segment X. it is a cross-sectional view at the bottom of the bottle body by ₄ -X 4 _'.

Hereinafter, a plastic bottle to which the present invention is applied will be described in detail with reference to the drawings.
As shown in FIG. 1, a plastic bottle 1 to which the present invention is applied includes a bottle main body 2, and the bottle main body 2 includes a bottom portion 3, a barrel portion 4 standing upright from the outer periphery of the bottom portion 3, and a barrel portion. 4 has a shoulder portion 5 gradually reduced in diameter at the upper end thereof, and an oral neck portion 6 standing in a cylindrical shape from the upper end of the shoulder portion 5, and a cap (not shown) is attached to the oral neck portion 6. It has a structure. In addition, the bottle body 2 is provided with a handle portion 7 that is easy to hold during use and facilitates a dispensing operation.

  Such a bottle main body 2 consists of synthetic resin materials, such as a polyethylene resin, a polypropylene resin, and a polyester resin, for example. In manufacturing the bottle body 2, for example, a cylindrical molding material called a parison is melted, put into a mold, and air is blown into the interior, such as direct blow molding or biaxial stretch blow molding. A method of forming by cooling at the same time as inflating is used.

  The cap attached to the bottle main body 2 is not particularly limited in its form, and although not shown, a cover that is detachably attached to the mouth neck 6 of the bottle main body 2 by screwing. In addition to the cap, for example, a cap provided with a measuring cap for measuring the content liquid poured out from the bottle body 2 may be used.

  Examples of the liquid (content liquid) stored in the plastic bottle 1 include liquid products such as shampoo, rinse, body soap, kitchen detergent, liquid clothing detergent, and softener.

  The plastic bottle 1 to which the present invention is applied is not particularly limited in terms of the external shape of the bottle body 2, but the bottom part 3 of the bottle body 2 has, for example, a bottom shape as shown in FIGS. 2 (a) to (c). It is a feature.

  Specifically, the bottle main body 2 includes a bottom raised portion 8 formed by raising the central portion of the bottom surface 3 a, a ring-shaped leg portion 9 surrounding the bottom raised portion 8, and the bottle raised portion 8. 2 and the line-shaped rib part 10 which protrudes toward the inner side.

  The rib portion 10 is extended in a direction orthogonal to the parting line PL of the bottle body 2 to reach the leg portion 9, and a plurality (five in this embodiment) are arranged in the direction orthogonal to the extension direction. Is provided. Further, each rib portion 10 has a shape inclined by a predetermined angle θ with respect to its center line S so that the width gradually increases from the parting line PL toward the leg portion 9.

  The parting line PL is a linear mark formed on the surface of the bottle body 2 along the dividing line of the mold during blow molding. A parting line PL is formed on the surface of the bottle body 2 to bisect the bottom surface 3a having a substantially elliptical shape along the major axis direction.

  Further, at the bottom 3 of the bottle body 2, the bottom raising portion 8 inside the leg portion 9 forms a flat surface 8 a between the rib portions 10. On the other hand, each rib portion 10 has a shape that is convex in a substantially arc shape from between each of the flat surfaces 8a toward the inside (upward) of the bottle body 2.

  In the plastic bottle 1 having the structure as described above, the rib portion 10 that protrudes from the bottom raised portion 8 of the bottle body 2 toward the inside of the bottle body 2 is orthogonal to the parting line PL of the bottle body 2. It extends in the direction to reach the leg portion 9 and is provided in a plurality in a direction orthogonal to the extending direction. Accordingly, the bottom portion 3 of the bottle body 2 can be secured while sufficiently securing the rigidity of the bottom portion 3 of the bottle body 2 without forming the bottle body 2 thick or using an expensive resin material having high rigidity. It is possible to suppress the deformation.

  Moreover, in this plastic bottle 1, the rigidity in the bottom part 3 of the bottle main body 2 can be further increased by having a shape in which the plurality of rib parts 10 gradually increase in width from the parting line PL toward the leg part 9. It is. Further, in the plastic bottle 1, the bottom raised portion 8 forms a flat surface 8 a between the rib portions 10, whereby the rigidity of the bottom portion 3 of the bottle body 2 can be increased.

  Moreover, in this plastic bottle 1, the bottom part 3 of the bottle main body 2 is made into such a bottom face shape, so that the releasability of the bottle main body 2 from the mold divided along the parting line PL after blow molding is improved. It is possible to improve the productivity.

  That is, on the bottom surface 3 a of the plastic bottle 1, the plurality of rib portions 10 have a shape in which the width gradually increases from the parting line PL toward the leg portion 9. Further, the bottom raised portion 8 forms a flat surface 8 a between the rib portions 10. In the case of having such a bottom shape, the mold can be easily removed from the bottom raised portion 8 of the bottle body 2 by forcibly removing the pair of molds in a direction perpendicular to the parting line PL after blow molding. It is possible to leave. Therefore, in the present invention, the bottle body 2 can be easily manufactured without complicating the structure of the mold.

  In addition, in this invention, it is not necessarily limited to the bottom face shape of the said bottle main body 2, A various change can be added in the range which does not deviate from the meaning of this invention. In addition, in the following description, about the site | part equivalent to the said bottle main body 2, while omitting description, the same code | symbol shall be attached | subjected in drawing.

  Specifically, the number of rib portions 10 formed on the bottom surface 3a of the bottle body 2 can be changed as appropriate. For example, the bottom shape of the bottle main body 2A shown in FIGS. 3A to 3C has a configuration in which seven rib portions 10 are formed on the bottom surface 3a of the bottle main body 2A, and FIGS. The bottom shape of the bottle main body 2B shown in c) has a configuration in which three rib portions 10 are formed on the bottom surface 3a of the bottle main body 2B. In any case, as in the case of the bottle main body 2, the bottle main bodies 2A and 2B are not thickly formed, and the bottom 3 of the bottle main bodies 2A and 2B is used without using an expensive resin material with high rigidity. It is possible to sufficiently increase the rigidity.

  Moreover, in the plastic bottle 1 to which the present invention is applied, for example, a configuration in which at least the rib portion 10 is formed on the bottom surface 3a as in the bottle main body 2C shown in FIGS. Therefore, instead of the flat surface 8a, a rib portion 11 that protrudes in a substantially arc shape toward the outside (downward) of the bottle body 2 may be formed between the rib portions 10. That is, the bottom shape of the bottle body 2C has a configuration in which the rib portions 10 and 11 are alternately arranged. In this case as well, the rigidity of the bottom 3 of the bottle body 2C can be sufficiently increased without forming the bottle body 2C thick or using an expensive resin material with high rigidity.

  On the other hand, when the flat surface 8a is provided between the rib portions 10 as in the bottom shape of the bottle bodies 2, 2A, 2B, the bottom 3 of the bottle bodies 2, 2A, 2B has sufficient rigidity. Therefore, the number of the rib portions 10 can be reduced as compared with the case of the bottle main body 2C. Therefore, in this case, it is possible to simplify the structure of the mold and make the manufacture of the bottle bodies 2, 2A, 2B easier.

  DESCRIPTION OF SYMBOLS 1 ... Plastic bottle 2,2A, 2B, 2C ... Bottle main body 3 ... Bottom part 3a ... Bottom 4 ... Trunk part 5 ... Shoulder part 6 ... Mouth and neck part 7 ... Handle part 8 ... Bottom raising part 8a ... Flat surface 9 ... Leg part 10 ... rib part 11 ... rib part

Claims (2)

A plastic bottle in which the bottle body is molded by blow molding,
The bottle main body has a bottom raised portion with the bottom center raised, a leg portion surrounding the bottom raised portion, and a rib portion raised from the bottom raised portion toward the inside of the bottle main body,
The rib part is extended in a direction orthogonal to the parting line of the bottle body to reach the leg part, and is provided in a plurality in a direction orthogonal to the extension direction .
The rib portion, the plastic bottle, characterized in Rukoto to have a the gradual width from the parting line toward the leg portion is increased shape.   The plastic bottle according to claim 1, wherein the bottom-up portion forms a flat surface between the rib portions.

Images