JP3839139B2 - Plastic bottle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a round plastic bottle, and more particularly to a round plastic bottle whose volume is reduced in response to decompression inside the bottle.
[0002]
[Prior art]
It has hitherto been practiced to cool a plastic bottle after the contents are heated and filled, and a plastic bottle that absorbs the reduced pressure during cooling is also well known.
The well-known bottle has a quadrilateral or hexagonal square body, horizontal ribs and vertical ribs on the circumferential surface of the barrel wall, and a flat barrel wall surrounded by the ribs. To absorb the reduced pressure.
[0003]
[Problems to be solved by the invention]
However, in conventional bottles, vertical ribs are arranged at each corner of the square bottle, and the flat surface is deformed inward so as to absorb reduced pressure. There was a problem of losing.
An object of the present invention is to provide a circular plastic bottle in which a deformed state due to decompression inside the bottle is not conspicuous with the technical problem of solving the above-described problems.
[0004]
[Means for Solving the Problems]
In order to achieve the above technical problem, the present invention is a plastic bottle having a mouth tube portion and a circular body portion as a circular plastic bottle, and an inclined rib portion and a vertical rib on the peripheral surface of the body tube wall. A large number of spiral ribs connected in a staircase shape are connected to each other by a circular arc portion, and the absorption panel is configured by the upper and lower inclined ribs and the left and right vertical ribs. The configuration is adopted.
[0005]
When arranging the spiral ribs, the spiral ribs are arranged on the periphery of the cylinder wall with two lines, a multi-line spiral curve drawn on the peripheral surface of the cylinder wall and a straight line extending in the vertical direction at predetermined angles. A multi-spiral spiral curve drawn on the surface and two straight lines extending in the vertical direction at predetermined angles are used as virtual lines, and the inclined rib portions are arranged in a spiral curve and the vertical rib portions are arranged along the straight lines. The configuration is characterized in that the inclined rib portion is formed so as to transition to the adjacent upper spiral curve through the vertical rib portion.
The virtual straight line is arranged at an angular position obtained by dividing the circumference into six in the case of a small trunk diameter, and at an angular position divided into eight or more parts in the case of a large trunk diameter.
[0006]
In addition, as a structural unit of the barrel wall that absorbs the reduced pressure in the bottle, the spiral rib includes a valley line, an inclined surface rising from the valley line, and a ridge line, and a spiral rib valley line adjacent to the ridge line of one spiral rib; The structure characterized by having connected between them by the curved surface and having formed the absorption panel is employ | adopted.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the bottle A of the present embodiment includes a mouth tube portion 1, a body portion 2, and a bottom portion 3, and is molded by biaxial stretch blow molding using PET or other rigid resin as a material resin. ing.
The mouth tube portion 1 is provided with a screw 4 for fitting a cap and a bulging ridge 5 formed at the lower end of the screw 4, and a holding ridge 6 is provided below the ridge 5.
[0008]
The body 2 is composed of a spheroidal shoulder peripheral wall 7 following the mouth tube 1, a cylindrical body wall 8 and a bottom peripheral wall 9, and the bottom 3 has a bottom end 10 following the bottom peripheral wall 9, and It consists of a bottom wall (not shown) provided with a number of radial ribs.
[0009]
On the peripheral surface of the barrel tube wall 8, multiple spiral ribs 13 in which inclined rib portions 11 and vertical rib portions 12 are alternately arranged in a staircase shape are arranged in parallel in the vertical direction of the bottle.
[0010]
Next, the configuration of the spiral rib 13 will be described with reference to FIGS.
First, the arrangement line for disposing the spiral ribs 13 will be described. As shown in FIG. 3, as shown in FIG. 3, a multiple spiral curve a (1 (1) drawn on the cylindrical peripheral surface of the barrel wall 8 with a constant pitch p. ,... N) and two virtual lines of a straight line b (1,... 6) extending in the vertical direction at points obtained by dividing the circumference every 60 °, the arrangement line of the spiral rib 13 is Along the two imaginary lines, the first curve extends from the spiral curve a1 to the straight line b1, and then transitions to the adjacent upper spiral curve a2.
[0011]
At the transition point from the spiral curve a1 to the straight line b1 and from the straight line b1 to the spiral curve a2, the transition is made in an arc shape, and the arrangement line of the spiral rib 13 is formed by the spiral curve a, the straight line b, and the circular arc c, and is adjacent It is separated from the arrangement line of the spiral rib 13.
A valley line or a ridge line of a spiral rib, which will be described later, is arranged along the arrangement line, and thus the spiral rib 13 is formed as a stepped continuous body in which the inclined rib portion 11 and the vertical rib portion 12 are connected by the arc portion 14. The
[0012]
The inclined rib portion 11 is formed in a mountain shape, and includes a valley portion, a rib inclined surface 15 rising from the valley portion, and a mountain peak, and has a ridge line 11a and a valley line 11b as shown in FIGS. The ridge line and the valley line of the adjacent spiral ribs 13 are connected by a straight line in the AA cross section.
[0013]
The vertical rib portion 12 includes a trough portion, a rib inclined surface 16 that rises rapidly from the trough portion, and a peak, and has a ridge line 12a and a trough line 12b as shown in FIGS. 4 and 6, and the ridge line 12a. Are connected to the valleys of the inclined rib portions 11 adjacent to each other and to the peaks of the adjacent inclined rib portions on the opposite side from the valley line 12b in a substantially BB cross section.
[0014]
Between the ridge lines 11a and 12a of one spiral rib 13 and the valley lines 11b and 12b of the adjacent spiral rib 13, one peripheral surface is formed along the peripheral surface of the trunk cylinder wall 8, and the configuration of the trunk cylinder wall 8 is formed. An absorption panel P as a unit is configured.
[0015]
The absorption panel P is a cylindrical surface having a substantially parallelogram in the development plane, and the periphery thereof is surrounded by the inclined rib portion 11 and the vertical rib portion 12 of the spiral rib 13. It can be regarded as a fixed parallelogram cylindrical surface.
When a uniform load toward the inside of the bottle is applied to the peripheral surface, the absorbent panel P bends with the intersection Z between the two opposite center lines X and Y shown in FIG. 4 as the maximum displacement point.
[0016]
At that time, the deflection on the Y-axis is allowed to be deformed by changing the bending degree of the angle formed between the rib inclined surface 15 and the absorbing panel P at the connecting portion between the inclined rib portion 11 and the absorbing panel P edge. The bending on the X-ray is allowed to be deformed by the long distance between the adjacent vertical rib portions 12.
The amount of bending at the intersection Z is determined by the shape of the spiral rib 13 such as the load, that is, the amount of decrease in the bottle internal pressure, the thickness of the barrel wall 8, the height of the rib, and the inclination angle of the inclined surface, as shown in FIG. As described above, the deformation can be allowed until the arc between the vertical rib portions opposed on the X-ray becomes a straight line.
[0017]
In the said Example, although the straight line b is arranged every 60 degrees which divided the circumference into 6 about the arrangement line of the spiral rib 13, the number of circumference divisions is set according to the capacity of the bottle.
That is, when the trunk diameter is small, six divisions are preferable, but when the trunk diameter is large, it is necessary to divide into eight divisions or more.
The number of divisions is set according to the size, shape, area, and wall thickness of the absorption panel P.
Further, the pitch p, the lead angle, and the like of the spiral curve a can be appropriately set according to the required absorption panel.
[0018]
Next, the effect of the bottle based on the said structure is demonstrated.
The bottle of the present invention is used when filling the heat-treated contents.
When the contents are heated and filled, the cap is fitted after the contents are filled and cooled with cooling water, but the inside of the bottle is in a reduced pressure state after cooling.
The reduced pressure in the bottle is absorbed by each absorption panel P, but is reinforced in the circumferential direction along with the axial direction by the inclined rib portion 11, so that the barrel wall 8 of the bottle is maintained in a cylindrical shape, and The deformation due to the reduced pressure is dispersed in a large number of absorption panels P, and the deformation of the individual absorption panels P is inconspicuous, so that the outer shape of the bottle does not substantially change even after the pressure reduction.
[0019]
Next, a second embodiment will be described with reference to FIG. 8. In this embodiment, a circumferential rib is formed in the middle portion of the barrel wall of the previous embodiment to reinforce the bottle barrel. is there.
As shown in FIG. 8, the bottle Aa is composed of a mouth part 1a, a body part 2a, and a bottom part 3a as in the previous embodiment, and is molded by biaxial stretch blow molding using PET or other rigid resin as a raw material resin. .
The trunk | drum 2a consists of the shoulder peripheral wall 7a, the trunk | drum cylinder wall 8a, and the bottom part peripheral wall 9a, and the circumferential rib 20 is arrange | positioned in the predetermined position of the trunk | drum cylindrical wall 8a peripheral surface.
[0020]
The cross section of the circumferential rib 20 includes a valley portion 21 having a certain width and an inclined rising portion 22 that is inclined from each end edge of the valley portion 21 and connected to the peripheral surface.
A plurality of spiral ribs 23 are disposed on the circumferential surface of the barrel tube wall 8a below the circumferential rib 20, and a portion of the circumference of the barrel tube wall 8a above the circumferential rib 20 and the lower portion of the shoulder circumferential wall 7a. A plurality of spiral ribs 24 are arranged on the surface.
[0021]
Each of the spiral ribs 23 and 24 is a continuous body in which the inclined rib portions 25 and the vertical rib portions 26 are connected in a circular arc, and are alternately continuous in a staircase shape.
The spiral curve and the straight line on which the spiral ribs 23 and 24 are disposed are cut at the circumferential rib 20, but are arranged on one common spiral curve and straight line.
The cross-sectional shapes of the inclined rib portion 25 and the vertical rib portion 26 and the configuration of the unit absorption panel Pa are the same as those of the previous embodiment, and bring about the same operational effects.
[0022]
In each said embodiment, although the plastic bottle is shape | molded by biaxial stretching blow molding, it may be shape | molded by direct blow molding as blow molding, and is not limited to biaxial stretching.
[0023]
【The invention's effect】
Since this invention is comprised as mentioned above, there exists the following effect.
The absorption panel formed between the inclined rib part and the vertical rib part absorbs the reduced pressure in the bottle, so the bottle remains substantially circular, and the deformation of the bottle due to heat filling and cooling is conspicuous. Because there is no bottle, the product value of the bottle can be increased.
[Brief description of the drawings]
FIG. 1 is a front view of a bottle according to a first embodiment of the present invention.
FIG. 2 is a plan view of the bottle.
FIG. 3 is an explanatory diagram of a bottle body wall viewed from the direction A in FIG. 2;
FIG. 4 is an explanatory diagram of an absorption panel.
5 is a cross-sectional view of an inclined rib portion taken along line AA in FIG.
6 is a cross-sectional view of a vertical rib portion taken along line BB in FIG.
7 is a modified explanatory view of the absorption panel taken along the line CC in FIG. 4; FIG.
FIG. 8 is a front view of a bottle according to a second embodiment.
[Explanation of symbols]
A, Aa Bottle P, Pa Absorption panel 1, 1a Mouth tube portion 2, 2a Trunk portion 8, 8a Trunk tube wall 11, 25 Inclined rib portion 12, 26 Vertical rib portion 13, 23, 24 Spiral rib 14 Arc portion 15, 16 Rib inclined surface 20 Circumferential rib 21 Valley part 22 Inclined rising part

Claims (3)

A plastic bottle having a mouth tube portion and a circular body portion,
A large number of spiral ribs that are connected in a staircase shape by connecting the inclined rib portion and the vertical rib portion by an arc portion on the circumferential surface of the barrel tube wall are formed so as to be parallel in the vertical direction,
A circular plastic bottle characterized in that an absorbing panel is constituted by opposed upper and lower inclined ribs and left and right vertical ribs . Spiral ribs are a multi-spiral spiral curve drawn on the peripheral surface of the barrel wall and two straight lines extending in the vertical direction at predetermined angles. 2. The circular plastic bottle according to claim 1, wherein the circular ribs are formed so as to be arranged along a straight line, and the inclined rib portion passes through the vertical rib portion and transitions to an adjacent upper spiral curve.   The spiral rib has an inclined surface and a ridge line rising from the valley line and the valley line, and the ridge line of one spiral rib and the valley line of the adjacent spiral rib are connected by a curved surface to form an absorption panel. The circular plastic bottle according to claim 1.

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