JP2014213926A - Heat filling bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat filling bottle capable of closing a peripheral groove for decompression absorption surely during decompression of a bottle, and capable of improving appearance of the bottle.SOLUTION: A heat filling bottle 1 which is formed by direct blow molding has a peripheral groove 31 which can be deformed elastically in a vertical direction around any height position of a trunk 30 where the thickness of the trunk 30 is in a range of 0.3-1.0 mm in all peripheral direction positions.

Description

  The present invention relates to a hot-fill bottle formed by direct blow molding, and in particular, intends to improve the appearance of the bottle by reliably closing a peripheral groove for absorbing reduced pressure when the bottle is depressurized.

  There is a filling method in which the content solution is filled in a direct blow molded bottle while the inner solution is heated. When such heat filling is performed, when the content liquid drops to room temperature, the inside of the bottle is in a reduced pressure state, and the bottle wall surface may be deformed inward to impair the appearance.

  In order to maintain the appearance of the bottle as a whole, it is possible to bend and deform the body of the bottle, for example. Some panels (vacuum absorption panels) are arranged to absorb pressure reduction (see, for example, Patent Document 1). However, in the invention described in Patent Document 1, there is a problem that a large space for arranging the panel has to be secured in the body portion.

Registered Utility Model No. 3050587

  In view of this, it is conceivable that a circumferential groove is provided around the body portion, and when the pressure in the bottle is reduced, the circumferential groove is elastically deformed up and down to absorb the reduced pressure. However, when a circumferential groove is provided in the body region where the thickness is not within the proper range, the circumferential groove does not deform sufficiently during decompression in the bottle, or the body portion collapses due to excessive deformation. May occur.

  Further, in the bottle formed by direct blow molding, the thickness of the body portion tends to be biased in the circumferential direction near the bottom due to the formation of pinch-off. That is, in the vicinity of the bottom where the pinch-off is formed, the thickness of the two portions facing along the pinch-off at the circumferential position of the trunk is maximized, while facing the pinch-off at the circumferential position of the trunk perpendicularly. The wall thickness at two locations is minimized. And the degree of this thickness deviation becomes more conspicuous as it approaches the bottom at the height of the body.

  Therefore, when the peripheral groove is provided in the body region near the bottom where the uneven pressure of the wall is large, the deformation of the peripheral groove is also biased during decompression of the bottle, and the peripheral groove cannot be closed over the entire periphery. There is a risk of damaging the appearance. In particular, when a product label is affixed across the circumferential groove, if the circumferential groove is not closed, the circumferential groove bites the product label, which may impair the commercial value.

  The present invention was developed in view of such a situation, and an object of the present invention is to provide a heat-filled bottle that can reliably close a peripheral groove for absorbing reduced pressure when the bottle is depressurized and improve the appearance of the bottle. To do.

That is, the gist configuration of the present invention is as follows.
1. A direct blow molded hot-fill bottle,
Circumferential grooves that can be elastically deformed up and down are provided at any height position of the trunk portion where the thickness of the trunk portion is in the range of 0.3 mm to 1.0 mm at any circumferential position. Characteristic hot-fill bottle.

2. The average value of the thickness of two locations facing the circumferential groove along the pinch-off at the circumferential position of the body portion, and the average value of the thickness of the two locations facing the pinch-off at the circumferential position of the trunk portion orthogonally The heat-filled bottle according to 1 above, wherein a difference between the temperature and the height of the body portion is 0.26 mm or less, and is provided at any height position of the body portion.

  According to the present invention, since the circumferential groove can be provided in the body region where the wall thickness is in an appropriate range, the circumferential groove is not sufficiently deformed or excessively deformed during decompression in the bottle. Can be surely avoided. Therefore, according to the present invention, it is possible to provide a heat-filled bottle that can reliably close the peripheral groove for absorbing reduced pressure when the bottle is depressurized and improve the appearance of the bottle.

  In addition, according to the invention, the circumferential groove has an average value of two thicknesses facing along the pinch-off at the circumferential position of the trunk portion, and two meats facing perpendicularly to the pinch-off at the circumferential position of the trunk portion. By providing a circumference at any height position of the body portion, the difference from the average value of the thickness being 0.26 mm or less, the circumferential groove can be closed over the entire circumference during decompression in the bottle.

The state before the heat filling of the hot filling bottle which concerns on one Embodiment of this invention is shown, The left half is a front view, The right half is the half sectional view. It is XX sectional drawing of FIG.

Hereinafter, with reference to FIGS. 1-2, the hot filling bottle which concerns on one Embodiment of this invention is illustrated and demonstrated in detail.
As shown in FIG. 1, the hot-fill bottle 1 includes a mouth portion 20 to which a cap or the like can be attached, a body portion 30 connected to the mouth portion 20, and a bottom portion 40 connected to the body portion 30. In this example, the hot-fill bottle 1 is formed of a synthetic resin composed of a laminate (for example, one having an EVOH layer in a part of layers) mainly composed of a PP (polypropylene) layer. Has been increased. In addition, you may form the hot filling bottle 1 only from PP. The bottom 40 has a pinch-off 41 formed when the hot-fill bottle 1 is directly blow-molded. In addition, one circumferential groove 31 that can be elastically deformed up and down is provided at a predetermined height position of the body portion 30. In FIG. 1, the body portion 30 is illustrated as a shape including a substantially conical upper region and a substantially cylindrical lower region. However, the shape of the body portion 30 is not limited to this. One cylindrical shape may be connected to a shoulder portion extending in a substantially horizontal direction, or may be directly connected to the lower end of the mouth portion 20 as a substantially egg shape.

  The circumferential groove 31 includes an upper edge portion 31a and a lower edge portion 31b that are disposed to face each other vertically, an upper circumferential wall 31c between the upper edge portion 31a and the lower edge portion 31b, a groove bottom wall 31d, and a lower circumferential wall 31e. And is formed in a concave shape in cross section. And by the elastic deformation of the upper and lower sides of the circumferential groove 31, the facing distance between the upper edge portion 31a and the lower edge portion 31b is narrowed, and the circumferential groove 31 is closed up and down to absorb the decompression of the bottle.

  The circumferential groove 31 is formed at the time of direct blow molding of a bottle by forming in advance a protrusion that is complementary to the circumferential groove 31 in a mold used when the hot filling bottle 1 is directly blow molded. Can do.

  In the present invention, the condition of the height position of the body portion that surrounds the circumferential groove 31 is a height position in which the thickness of the body portion 30 is in the range of 0.3 mm to 1.0 mm at any circumferential position. That is.

  Here, the reason why the range is 0.3 mm to 1.0 mm is as follows. That is, when the thickness is less than 0.3 mm, the wall thickness of the circumferential groove 31 and the body portion 30 in the vicinity of the circumferential groove 31 becomes too thin. As a result, when the bottle is depressurized, the decompression deformation remains in the elastic deformation above and below the circumferential groove 31. This is because the body portion 30 near the circumferential groove 31 is deformed and the appearance of the bottle is deteriorated. When the thickness exceeds 1.0 mm, the wall forming the circumferential groove 30 (upper circumferential wall 31c, groove bottom wall) This is because the wall 31d and the lower peripheral wall 31e) are too thick, and the circumferential groove 31 cannot be sufficiently elastically deformed up and down when the bottle is decompressed, and the circumferential groove cannot be closed.

  In deriving such conditions, the applicant must manufacture three types of heat-filled bottles each including the circumferential groove 31 having the following specifications, and can close the circumferential groove 31 over the entire circumference. It was confirmed. All the bottles are formed by direct blow molding with a synthetic resin composed of a laminate including a PP layer as a main component and an EVOH layer in a part of the layers, and the barrel portion has a substantially egg shape.

Example 1
-Circumferential height of the circumferential groove (upper edge portion 31a): 50 mm
-Opposite distance between the upper edge portion 31a and the lower edge portion 31b (before decompression deformation): 2.0 mm
(Example 2)
-Circumferential height of the circumferential groove (lower edge 31b): 5 mm
-Opposite distance between the upper edge portion 31a and the lower edge portion 31b (before decompression deformation): 2.0 mm
Example 3
-Circumferential height of the circumferential groove (lower edge 31b): 5 mm
-Opposite distance between the upper edge portion 31a and the lower edge portion 31b (before decompression deformation): 2.0 mm

The circumferential height of the circumferential groove was measured with the height of the bottom (the ground contact surface of the bottle) being 0 mm.
The actual measurement values of the wall thickness of the bottles of Examples 1 to 3 were as follows. In the table, A to D indicate circumferential positions shown in FIG. That is, A and C indicate two locations that face along the pinch-off 41 at the circumferential position of the trunk portion 30, and B and D indicate two locations that are orthogonal to and face the pinch-off 41 at the circumferential position of the trunk portion 30. Indicates.

  From the measurement results in Table 1, it can be seen that the circumferential groove 31 could be closed even when the upper edge portion 31a of the circumferential groove 31 was positioned at a height position where the body thickness was 0.84 mm at the maximum. . It can also be seen that the circumferential groove 31 could be closed even when the lower edge portion 31b of the circumferential groove 31 was positioned at a height position where the barrel thickness was a minimum of 0.38 mm. That is, if the thickness of the trunk portion 30 is in the above-described range of 0.3 mm to 1.0 mm in any circumferential position, and is at least a height position in the range of 0.38 mm to 0.84 mm, It was confirmed that by providing the circumferential groove 31, the circumferential groove 31 can be reliably closed when the bottle is decompressed.

  Further, as described above in relation to the problem to be solved by the present invention, the bottle formed by direct blow molding has a thickness of the body portion 30 near the bottom portion 40 due to the formation of the pinch-off 41. There is a tendency to be biased in the circumferential direction. That is, in the vicinity of the bottom 40 where the pinch-off 41 is formed, the thicknesses of the two locations A and C facing each other along the pinch-off 41 at the circumferential position of the trunk 30 are maximized, while the circumferential position of the trunk 30 is The thickness of the two locations B and D that are orthogonal to and opposite to the pinch-off 41 in FIG. The degree of the thickness deviation becomes more prominent as the bottom portion 40 is approached at the height position of the body portion 30.

  Here, when the circumferential groove 31 is provided at a height position where the thickness of the body portion 30 is uniform, the upper and lower elastic deformation amounts of the circumferential groove 31 are uniform in the circumferential direction, and therefore the circumferential groove is closed over the entire circumference. However, when the circumferential groove 31 is provided near the bottom 40 where the thickness of the body portion 30 is large as described above, the amount of elastic deformation above and below the circumferential groove 31 is biased in the circumferential direction. For this reason, the circumferential groove cannot be closed over the entire circumference, resulting in a circumferential groove shape with an uneven groove width in which a portion with a large groove width and a portion with a small groove are mixed, and the bottle appearance is impaired.

Therefore, such a condition of the height position of the body portion surrounding the circumferential groove 31 that can sufficiently avoid the bias of the elastic deformation amount of the circumferential groove 31 and can close the circumferential groove over the entire circumference, Derived as follows.
(1) The circumferential height of the circumferential groove (lower edge portion 31b) was set to 5 mm, and the average value of the measured values of Examples 2 and 3 in which the circumferential groove was confirmed to be closed over the entire circumference was obtained. The results are shown in Table 2.
(2) In Table 2, for a height position of 5 mm, the difference between the average value of the thickness at A and C and the average value of the thickness at B and D was calculated. As a result, the value of the difference is
(0.67 + 0.575) / 2- (0.45 + 0.41) /2=0.925
Met.
(3) Also, the difference between the average thickness of A and C in Example 2 and the average thickness of B and D is:
(0.70 + 0.63) / 2- (0.42 + 0.38) /2=0.265
Met.
(4) Moreover, the value of the difference between the average thickness of A and C in Example 3 and the average thickness of B and D is:
(0.64 + 0.52) / 2- (0.48 + 0.44) /2=0.12
Met.

  Therefore, in order to sufficiently avoid the bias of the elastic deformation amount of the circumferential groove 31 and to close the circumferential groove over the entire circumference, the two locations A and C facing each other along the pinch-off 41 in the circumferential position of the body portion 30 are used. Any height position where the difference between the average value of the wall thickness and the average value of the wall thicknesses of the two locations B and D that are orthogonal to and opposite to the pinch-off 41 at the circumferential position of the body 30 is 0.26 mm or less. It is preferable that the circumferential groove 31 is circumferentially provided, and more preferably, the circumferential groove 31 is circumferentially provided at any height position where the difference is 0.19 mm or less.

  According to such a configuration, the circumferential groove 31 can be provided in the region of the body portion 30 where the wall thickness is in an appropriate range. Therefore, the circumferential groove 31 is not deformed sufficiently or is excessively deformed during decompression in the bottle. Thus, it is possible to reliably avoid the body portion 30 from being crushed. Moreover, according to this structure, the bias | inclination of the elastic deformation amount of the circumferential groove 31 can fully be avoided at the time of pressure reduction in a bottle, and the circumferential groove 31 can be closed over the perimeter. Therefore, even when the product label is pasted across the circumferential groove 31, the circumferential groove 31 does not bite the product label, and the bottle appearance can be maintained well.

  The above description shows only one embodiment of the present invention, and various modifications can be made within the scope of the claims. For example, the cross-sectional shape of the circumferential groove 31 is shown in FIG. 1 as having a substantially horizontal upper circumferential wall 31c and a lower circumferential wall 31e inclined relative to the upper circumferential wall 31c, but is not limited to such a shape. The lower peripheral wall 31e may be substantially horizontal, the upper peripheral wall 31c may be inclined with respect to the lower peripheral wall 31e, and the circumferential groove 31 may be formed in a substantially U-shaped cross section.

DESCRIPTION OF SYMBOLS 1 Heat filling bottle 20 Mouth part 30 Body part 31 Circumferential groove 31a Upper edge part 31b Lower edge part 31c Upper peripheral wall 31d Groove bottom wall 40 Bottom part 41 Pinch off A, C Two places which oppose along the pinch-off in the circumferential position of a trunk part B, D Two places that are perpendicular to the pinch-off at the circumferential position of the body

Claims (2)

A direct blow molded hot-fill bottle,
Circumferential grooves that can be elastically deformed up and down are provided at any height position of the trunk portion where the thickness of the trunk portion is in the range of 0.3 mm to 1.0 mm at any circumferential position. Characteristic hot-fill bottle.   The average value of the thickness of two locations facing the circumferential groove along the pinch-off at the circumferential position of the body portion, and the average value of the thickness of the two locations facing the pinch-off at the circumferential position of the trunk portion orthogonally The hot-filling bottle according to claim 1, wherein a difference between the temperature and the height of the body portion is 0.26 mm or less.

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