JP4207384B2 - Plastic molding container - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a plastic molded container, in particular, a PET bottle that can be used in a vending machine.
[0002]
[Prior art]
Selling canned beverages with vending machines has been practiced in the past, but recently there has been an increasing demand to sell PET bottles with vending machines.
[0003]
【task to solve】
Even plastic bottles with cylindrical barrels can be easily handled by vending machines, but PET bottles with square barrels have not been shaped to accommodate vending machines so far. If you put it in a vending machine, there are problems such as bottle clogging and discharging many bottles. This is considered to be due to the above-mentioned problem caused by the deformation of the bottle due to the accumulated pressure of the bottle in the column of the vending machine because the lateral rigidity of the square bottle is weak.
[0004]
In order to increase the lateral rigidity of the square plastic bottle, a lateral bead consisting of a groove-shaped recess is placed in the container body, but in order to provide an effective bead, the shape and position of the bead and the bead are arranged. Need to be taken into consideration (see Japanese Patent Application Laid-Open No. 8-276924). In the experiment of this inventor, when the bead is deepened, the lateral rigidity of the bottle is improved. However, if the bead is made deeper, the moldability of the bottle becomes worse.
[0005]
It is also considered to change the depth of the horizontal bead partially (see the above-mentioned patent application publication). However, if the depth of the horizontal bead is changed partially, If the posture is not always kept constant, the lateral stiffness may not be exhibited, and the lateral stiffness may be reduced. For this reason, development of a technique for improving the lateral rigidity more effectively is desired.
[0006]
The present invention has been made in view of the circumstances as described above, and an object thereof is to provide a plastic molded container that improves the lateral rigidity of the rectangular plastic container and does not deteriorate the moldability of the bottle. It is.
[0007]
【Constitution】
Corresponding to this object, in the plastic molded container of the present invention, the bottle barrels between the shoulder part adjacent to the upper part and the heel part adjacent to the lower part are respectively located along the bottle center line direction and are mutually centered on each other. A plastic molded container composed of four panel surfaces arranged adjacent to each other around a line and four corner surfaces positioned between the adjacent panel surfaces, and in the direction of the center line in the trunk portion A lateral bead is formed in a middle portion along a plane perpendicular to the center line, and the lateral bead is formed from a groove having a constant depth that traverses the panel surface and reaches a side edge of the panel surface. And the horizontal bead does not cross the corner surface, and the upper and lower portions of the panel surface in the direction of the center line than the horizontal bead in the panel surface A panel bead made of another horizontal bead made of a concave groove, which is formed in parallel to the bead and has a length smaller than the width of the panel surface and having a constant depth over the entire length, from the vicinity of the horizontal bead to the vicinity of the shoulder and Ri Na formed by disposing a plurality of up to the vicinity of the heel portion, and the shape of the outer surface of the corner surface in a cross section passing through the center of said corner surface includes the center line of the body portion is a circular arc, of the arc The center is characterized in that the center is located closer to the bottom of the bottle than the height of the intermediate portion.
[0008]
【Example】
The details of the present invention will be described below with reference to the drawings showing an embodiment.
In FIG. 1, reference numeral 1 denotes a rectangular plastic molded container of the present invention. The square plastic molding container 1 is a biaxial stretch blow molding container made of, for example, polyethylene terephthalate (PET). The square plastic molded container 1 includes a nozzle portion 2, a connecting portion 3, a shoulder portion 4, a trunk portion 5, a heel portion 6 and a bottom portion 7 from the upper end portion to the lower end portion.
[0009]
The body portion 5 includes four panel surfaces 11 having an angular interval perpendicular to each other located along the bottle center line 8 and four corner surfaces 12 having an angular interval perpendicular to each other between adjacent panel surfaces. The shoulder portion 4 is provided at the upper end portion of the body portion 5, and the nozzle portion 2 is formed at the upper end of the shoulder portion 4 via the connecting portion 3. A bottom portion 7 is continuously connected to a lower end portion of the body portion 5 via a heel portion 6 to close a lower end of the bottle.
[0010]
A waist bead 13 is formed at an intermediate portion of the body portion 5 and each panel surface 11 is vertically divided into an upper portion 14 and a lower portion 15. The waist bead 13 is a horizontal bead made of a concave groove drawn inwardly formed along an imaginary plane perpendicular to the center line 8 in an intermediate portion of the body portion 5 in the direction of the center line 8. Each waist bead 13 does not go around the body 5 but is formed linearly only on each panel surface 11 in a plane perpendicular to the bottle center line 8, and is formed on each corner surface 12. Is not formed. The waist bead 13 reaches the side edge 17 of the panel surface 11, but when the end of the waist bead 13 hits the side edge of the corner surface 12, the waist bead 13 disappears and does not cross the corner surface 12. When the waist bead 13 is in the panel surface 11, the depth t ₁ of the waist bead 13 is constant, and when the distance (body diameter) between the opposing panel surfaces 11 is D, t ₁ = (0.03 to 0 .85) D.
[0011]
A plurality of panel beads 16, which are other horizontal beads, are also formed on the upper portion 14 and the lower portion 15 of the body portion 5. The panel bead 16 is formed of a concave groove drawn inside the panel surface.
[0012]
The panel beads 16 do not go around the body part 5 but are formed linearly only on the upper part 14 and the lower part 15 in the plane perpendicular to the bottle center line 8. It is not formed on the surface 12. Further, the panel bead 16 is formed in the panel surface 11, and the end thereof does not reach the side edge 17 of the panel surface 11. The depth t ₂ of the panel bead 16 is constant, and t ₂ = (0.03 to 0.075) D.
[0013]
On the other hand, the cross-sectional shape of the outer surface of the corner surface 12 in the imaginary cross section including the center line 8 can be a straight line, a curved line or an arc. In particular, an arc having a radius R can increase the lateral rigidity of the bottle. It is valid. In particular, the height position of the center O of the arc is a position h lower than the height position H of the waist bead 13, that is, near the bottom of the bottle.
[0014]
In the rectangular plastic molded container configured as described above, the waist bead 13 and the panel bead 16 cooperate with each other, and in addition to this, the arc-shaped corner surface acts to increase the lateral rigidity, and this is automatically sold. Even when the machine column is filled, it can withstand the accumulated pressure of the bottle, does not deform, and does not clog bottles or discharge many bottles.
[0015]
[Experimental example]
The bottle lateral rigidity was evaluated and compared for a conventional product (STAS500SB) having a capacity of 500 ml each and a plastic container (STAS500SC) of the present invention. The evaluation items and evaluation results are shown below.
[0016]
A square PET container having an internal volume of 500 ml (D = 60 mm) as shown in the figure was produced by biaxial stretching blow molding of polyethylene terephthalate resin with the following bead dimensions. The container was filled with 20 ° C. water until it reached 40.5 mm below from the bottle mouth, and used as an evaluation sample.
[0017]
As a method for evaluating the bottle lateral rigidity of the evaluation sample, it was confirmed whether or not the clearance of 52 mm was passed when a load of 12 kgf (117.7 N) was applied at a sample temperature of 2 ° C. In the evaluation, when the load did not slip through, it was evaluated as “◯”, the occurrence of slipping through or the bottle was broken: “×”.
Example 1
Waist beat depth: 1.8mm (D = 60mm 3%)
Upper and lower panel beat depth: 1.8mm (3% of D = 60mm)
→ Evaluation: ○
Example 2
Waist bead depth: 5.1 mm (D = 60 mm, 8.5%)
Upper and lower panel bead depth: 4.5mm (D = 7.5% of 60mm)
→ Evaluation: ○
Comparative Example 1
Waist bead depth: 1.7 mm (2.8% of D = 60 mm)
Upper and lower panel bead depth: 1.5 mm (D = 2.5% of 60 mm)
→ Evaluation: × (Folding was seen in the waist bead)
Comparative Example 2
Waist bead depth: 5.4 mm (D = 60 mm, 9.0%)
Upper and lower panel bead depth: 4.8 mm (D = 60 mm, 8.0%)
→ Bottle molding was not possible.
[0018]
【The invention's effect】
As is apparent from the above description, according to the present invention, it is possible to obtain a plastic molded container that improves the lateral rigidity of the rectangular container and does not deteriorate the moldability of the bottle.
[0019]
[Brief description of the drawings]
FIG. 1 is a front view of a plastic molded container according to the present invention.
FIG. 2 is a cross-sectional explanatory view taken along the line bb in FIG.
3 is a cross-sectional view taken along a line CC in FIG. 2. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Plastic molding container 2 Nozzle part 3 Connecting part 4 Shoulder part 5 Body part 6 Heel part 7 Bottom part 8 Bottle center line 11 Panel surface 12 Corner surface 13 Waist bead 14 Upper part 15 Lower part 16 Panel bead 17 Side edge

Claims (3)

Four panel surfaces that are arranged along the bottle centerline direction and that are adjacent to each other around the centerline, respectively, between the shoulder portion adjacent to the upper portion and the heel portion adjacent to the lower portion. And four corner surfaces located between the adjacent panel surfaces, and a horizontal portion along a plane perpendicular to the center line at the middle portion of the body portion in the center line direction. Forming a bead, wherein the horizontal bead is formed of a horizontal bead having a concave groove having a depth that reaches the side edge of the panel surface across the panel surface, and the horizontal bead is the corner surface Is formed in parallel to the horizontal bead in the upper part and the lower part in the center line direction with respect to the horizontal bead on the panel surface, and the width of the panel surface is smaller than the width of the panel surface. Of small constant over the entire length depth, Ri Na formed by arranging a plurality of the panels bead consisting of other horizontal bead consisting groove to the shoulder portion near and near the heel portion from the vicinity of the transverse beads, The shape of the outer surface of the corner surface in a cross section including the center line of the body portion and passing through the center of the corner surface is an arc, and the center of the arc is located closer to the bottom of the bottle than the height position of the intermediate portion. A plastic molded container. The plastic molding container according to claim 1, wherein the depth of the horizontal bead is 3 to 8.5% of the width of the bottle body. The depth of said other horizontal bead is 3 to 7.5% of the width | variety of the said bottle trunk | drum, The plastic molding container of Claim 1 or 2 characterized by the above-mentioned.

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