JP4556206B2 - Liquid storage products - Google Patents

Description

  The present invention relates to a synthetic resin casing and a liquid storage product in which a content liquid is frozen and used.

For example, a casing made of synthetic resin such as polyethylene terephthalate (hereinafter referred to as PET) resin disclosed in Patent Document 1 is widely used for beverages such as water, sports drinking water, tea and juice. In addition, in the summer, etc., such a housing is also used for drinking while gradually melting the one in which the content liquid is frozen in a freezer.
Japanese Patent Laid-Open No. 10-58527

  When water is frozen, its volume increases by approximately 1.09 times. Therefore, in a sealed enclosure, the enclosure may be damaged due to the increase in volume caused by freezing. There is a problem such that the product is deformed and the storage and display in a frozen state are hindered, or the product cannot be provided as a product due to the deformed appearance. In addition, if the housing bulges and deforms in the frozen state, the shape of the bulging deformation state of the housing recovers to its original state when the cap is opened with the content liquid partially dissolved. There are problems such as spilling.

  The present invention was devised to solve the above-described problems, and is a product intended to be sold and used by freezing the content liquid in a state where the content liquid is filled and the mouth tube portion is sealed. In order to create an index for product design including the product specifications, safety, appearance, or the shape of the housing according to the mode of use of this product, It is an object of the present invention to provide a synthetic resin casing that can be safely stored and used, and that does not impair the merchantability, and a liquid storage product in which the synthetic resin casing is filled with a content liquid.

The means of the first invention for solving the above technical problem is:
It is a synthetic resin casing intended to be used by freezing the content liquid in a state where the content liquid is filled in a predetermined volume and the mouth tube part is sealed,
The full volume C _OF at the predetermined reference temperature _Tr of the housing satisfies the condition shown in the following formula (1), and the limit volume increment ΔC _cr in a preset bulged limit deformation state is _expressed by the following formula (2 The shape of the housing satisfies the conditions shown in FIG.
C _OF > α (v _sf / v _sl ) V _l + (1−α) V _l (1)
ΔC _cr > (v _sf / v _sl ) V ₁ −C _OF + βV _h (2)
However, V _l headspace volume at a predetermined reference temperature T _r in the volume at a predetermined reference temperature T _r of the content liquid filled in the bottle body, the V _h the bottle, v _sl predetermined reference temperature T _r of the content liquid _Sf is the specific volume in the completely frozen state of the content liquid, α is the weight ratio of the frozen portion of the content liquid (takes a value in the range of 1 to 0), and β is in the range of 1 to 0 A coefficient indicating the value. In the formula (2), V _h = C _OF −V ₁ .

The term α (v _sf / v _sl ) V _{l in} the right side of the formula (1) is the volume of the frozen portion in the content liquid, and (1-α) V _l is the volume of the liquid portion, and the sum of both is a partial The total volume of the content liquid in a frozen state. Here, the case where α is 1 corresponds to a completely frozen state, and the volume of the content liquid at that time is (v _sf / v _sl ) V ₁ .

The predetermined reference temperature Tr for evaluating V _l , V _h , and v _sl is not particularly limited, but may be evaluated at a temperature of about 20 ° C., for example. Incidentally, the specific volume v _sl of water at 20 ° C. is 1.00 cm ³ / g, the specific volume v _sf of ice at 0 ° C. is 1.09 cm ³ / g, and the ratio v _sf / v _sl of both is 1.09. It becomes.

The condition of the formula (1) assumes a usage mode in which the content liquid is opened in a state where it is partially dissolved from a completely frozen state to a predetermined α value. Then, the full volume C _OF at a predetermined reference temperature T _r of the _casing is expressed by an equation (α for a predetermined value according to the type of the content liquid (v _sf and v _sl are determined), the filling volume V _l and the usage mode ( By satisfying the condition of 1), when the stopper is opened in a partially dissolved state below a predetermined α, it is possible to prevent the dissolved content liquid from spilling out or flowing out. it can. C _OF can be obtained by filling the content liquid of the predetermined reference temperature _Tr to the overflow state, that is, it corresponds to the entire volume including the mouth tube portion.

  Next, equation (2) determines the conditions related to the bulging deformation of the casing due to the volume increase of the content liquid during complete freezing. The amount of the right side of equation (2) is when completely frozen without cap This is equivalent to the amount overflowing from the housing, and when it is capped, the housing bulges and deforms as much as it overflows.

  Here, in the case of products filled with high content liquids such as fruit juices and tea for sterilization at a temperature of around 90 ° C. and sealed with caps, the container is reduced in volume at room temperature and deformed. When the cap is in a capped state, the volume of the liquid content increases due to freezing, and the air in the head space is compressed. When the pressure rises greatly, the cap seal is damaged.

Not available all the headspace volume V _h to the absorption of the volume increment by freezing for this reason. Therefore, the coefficient β is a coefficient representing the ratio of the volume that cannot be used for absorption of the volume increment due to freezing in the head space volume V _h as a value of 0 to 1.

  Considering the effect on the seal strength of the high temperature cap, the higher the seal strength, the more the gas in the head space can be compressed, and β can be made closer to zero.

On the other hand, the limit volume increment ΔC _cr is an amount determined in relation to the extent to which the bulging deformation of the housing is allowed, that is, the product design of the liquid storage product. Depending on the purpose of use, in applications where there is no problem with bulging deformation such as distorted deformation, the content liquid filling amount at the time of rupture of the housing can be obtained and determined in consideration of the safety factor. Further, from the viewpoint of a sense of security or impression given to the user, the limit volume increment ΔC _cr is determined within a range in which there is no remarkable distortion. Depending on the limitation of use, _{ΔC cr} may be 0, that is, a condition without bulging deformation.

Here, if there is a sample of the housing, a test is performed in which the water is pressurized and filled in a sealed state, or data relating the water filling capacity and the deformation mode of the housing is obtained by structural calculation by computer simulation or the like. Therefore, the limit volume increment ΔC _cr that is the volume increment of the housing in the allowable bulging deformation state set in advance as described above can be approximately obtained.

Further, for example, if the casing has a round cross section of the trunk, a round bottle with a round shape, the casing can hardly be bulged, so ΔC _cr cannot be set large. _{ΔC cr} can be set large in applications where bulging deformation is allowed.

By the described bottle body limits the volume increment △ C _cr to design the shape of the bottle so as to as to satisfy the condition of equation (2), the bulging-shaped bottle body even completely frozen state The deformation can be within the range of a predetermined deformation mode that can be safely stored and used and does not impair the merchantability of the liquid storage product.

As described above, the configuration of the first invention presents a design guideline for the shape of a synthetic resin casing for a liquid storage product to be used by freezing the content liquid. In accordance with this guideline, that is, a liquid storage product In consideration of the product specifications and usage conditions, design the housing shape so that the full volume C _OF satisfies the formula (1) and the limit volume increment ΔC _cr satisfies the formula (2). It is possible to provide a synthetic resin casing that can be stored and used and that does not impair the merchantability of the liquid storage product.

The means of the second invention is that, in the first invention , the flat cross-sectional shape of the body portion is a non-round shape.

With the above-described configuration of the second invention , when the flat cross-sectional shape of the body portion is a shape such as a regular polygon shape, a flat shape such as an ellipse or an ellipse, that is, a non-circular shape, this flat cross-section By bringing the shape closer to a perfect circle from a non-perfect circle, the plane cross-sectional area can be increased, and the volume increase due to freezing of the content liquid is absorbed by the increase in the plane cross-sectional area without permanently deforming the body. It becomes possible.

In addition, if the flat cross-sectional shape is determined in this way, it is easy to calculate the increase in the flat cross-sectional area when it is deformed into a true circle. Therefore, it is possible to predict the volume increment and deformation mode that can be expected by bulging deformation, that is, ΔC _cr . The shape of the housing can be easily designed from this ΔC _cr .

According to a third aspect of the present invention , in the first or second aspect, a biaxial stretch blow-molded product made of a PET resin is used.

With the above configuration of the third aspect of the invention, a biaxial stretch blow molded casing made of PET resin that is widely used for beverage bottles and exhibits excellent mechanical properties even at low temperatures is used by freezing the content liquid Can be used for a wide range of purposes.

  As the PET resin, PET is mainly used. As long as the essence of the PET resin is not impaired, a copolymer polyester mainly containing ethylene terephthalate units and containing other polyester units can be used. In order to improve heat resistance, a nylon resin, a polyethylene naphthalate resin or the like can be blended. Examples of the component for forming the copolyester include dicarboxylic acid components such as isophthalic acid, naphthalene 2,6 dicarboxylic acid, and adipic acid, propylene glycol, 1,4 butanediol, tetramethylene glycol, neopentyl glycol, cyclohexanedimethanol, Mention may be made of glycol components such as diethylene glycol.

  Furthermore, as long as the essence as a PET resin casing is not impaired, for example, a PET resin / nylon resin / PET resin such as a nylon resin or the like is used to improve heat resistance and gas barrier properties. The intermediate layer may be provided.

According to a fourth aspect of the present invention , there is provided a liquid storage product intended to be sold and used by freezing the content liquid in a state in which the synthetic resin casing is filled with the content liquid and the mouth tube portion (2) is sealed. Because
The relationship between the housing shape, the product specification, and the quantity related to the product specification mode satisfies the conditions shown in the following formulas (1) and (2).
C _OF > α (v _sf / v _sl ) V _l + (1−α) V _l (1)
ΔC _cr > (v _sf / v _sl ) V ₁ −C _OF + βV _h (2)
However, C _OF is the full injection volume at the predetermined reference temperature _Tr of the casing, _{ΔC cr} is the limit volume increment in the preset bulging limit deformation state, and V _l is the predetermined reference of the content liquid filled in the casing. Volume at temperature T _r , V _h is head space volume at predetermined reference temperature T _r in the housing, v _sl is specific volume at predetermined reference temperature _Tr of the content liquid, and v _sf is a ratio of the content liquid in a completely frozen state Volume, α is a weight ratio of frozen parts (numerical value in the range of 1 to 0), and β is a coefficient indicating a value in the range of 1 to 0. Also a medium equation _{(2) V h = C OF} -V l.

The above formulas (1) and (2) are respectively the same conditional expressions as the formulas (1) and (2) in the first invention described above. According to the above configuration of the fourth aspect of the invention , in the liquid storage product intended to be used by freezing the contents liquid, the product design guidelines including the housing shape are presented in the product specification and usage mode. , V _sl , v _sf , V _l , V _h , β, α, C _OF , and ΔC _cr and so on by designing the product so as to satisfy the conditions of Formula (1) and Formula (2) In addition, it is possible to provide a liquid storage product that can be safely stored and used for use that is frozen and does not impair the merchantability.

That is, for example, if the usage mode such as the shape of the housing to be used and the degree of freezing is determined first, the filling volume V _l and the head space volume V _h can be adjusted accordingly. On the other hand, once the usage mode is determined, the product design of the liquid storage product can be carried out in various ways such as adjusting the shape of the casing and the ratio of the filling volume V ₁ and the head space volume V _h according to the usage.

The present invention has the above-described configuration, and has the following effects.
In the first invention , the design guideline for the shape of the synthetic resin casing for use in the product according to the product specification and specification mode of the liquid storage product intended to be used by freezing the content liquid According to this guideline, it is possible to provide a synthetic resin casing that can be safely stored and used and that does not impair the merchantability of the liquid storage product.

In the second invention , the cross-sectional area can be increased by bringing the flat cross-sectional shape closer to a perfect circle, so that the volume increase due to freezing of the content liquid can be achieved without permanently deforming the barrel. Absorption can be achieved by increasing the cross-sectional area. In addition, since it is easy to calculate the increase in the flat cross-sectional area when deformed into a true circle, the shape of the housing can be easily designed from the volume increment and deformation mode that can be expected by bulging deformation.

In the third aspect of the invention , a biaxial stretch blow-molded casing made of PET resin can be widely used for applications in which the content liquid is frozen.

In the fourth invention , a product design guideline as a total of the liquid storage product intended to be used by freezing the content liquid is presented. The product design can be carried out, and a liquid storage product that can be safely stored and used for an application to be used frozen and that does not impair the merchantability can be provided.

Embodiments of the present invention will be described below.
1 to 4 show a first embodiment of a synthetic resin casing of the present invention, which is a biaxial stretch blow molded PET resin casing for 500 ml. The shape of the casing 1 is flat as a whole, and has a mouth portion 2, a shoulder portion 3, a trunk portion 4, and a bottom portion 5. When viewed in the height direction, the height of the trunk portion 4 from the upper end portion and the lower end portion is the center height. The shape is gradually reduced in diameter toward the position. 1 and 2 show a state in which the content liquid L is filled, and the head space HS exists on the liquid level LH. In this state, the product is sealed with a cap to obtain a liquid storage product.

  FIG. 3 shows a plan sectional view (FIGS. 3A and 3B) and a bottom view (FIG. 3C) of the housing 1, but FIG. The flat cross-sectional shape is shown together, and the flat cross-section BB is the flat cross-sectional shape of the upper end portion of the body 4 along the line BB in FIG. 1, and the flat cross-section CC is the shoulder portion along the line CC in FIG. 3 is a flat cross-sectional shape.

  As can be seen from FIG. 3, the planar cross-sectional shape of the body portion 4 is a non-circular shape, and the upper end portion and the lower end portion thereof have a rectangular shape with rounded corners that are rounded (FIG. 3A). , (C)), the shape is gradually changed from the upper end portion and the lower end portion toward the center height position, and the most reduced diameter portion of the center height position is relatively different from the arc portion of the curvature radius R1. It is a shape composed of a circular arc portion having a large radius of curvature R2 that is nearly flat (see FIG. 3B).

Next, Formula (1) will be specifically described with reference to the casing 1 of the first embodiment.
C _OF > α (v _sf / v _sl ) V _l + (1−α) V _l (1)
Here, when the content liquid is water and the predetermined reference temperature Tr is 20 ° C., the specific volume v _sl of water at 20 ° C. is 1.00 cm ³ / g, and the specific volume v _sf in a frozen state at 0 ° C. is 1. 09 cm ³ / g.

FIG. 5 is an explanatory diagram showing the amount of the right side of the equation (1) when α is changed in a state where the filling volume V ₁ is 500 ml and the housing 1 is sealed with a cap, and is shown as a graph. . The horizontal axis is α, the vertical axis is the volume (ml) of the content liquid, and the c-a line is the volume of the entire content liquid (α (v _sf / v _sl ) V ₁ + (1−α) V ₁ ), c The -b line indicates the volume of the frozen part (α (v _sf / v _sl ) V _l ). Further, the d → e → c line represents the volume change of the casing 1 during the freezing process when the full volume C _OF of the casing 1 is set to 530 ml.

  Although there is no bulging deformation in the range of d-e, the volume of the content liquid L reaches 530 ml at the point e (α = 0.63), and further freezing proceeds, the non-circular flat shape of the body 4 is increased. As the cross-sectional shape changes to a perfect circle (see FIG. 4), the bulge-like deformation of the housing 1 proceeds along the e → c line, and reaches a completely frozen state at the point c. Of course, there are cases where it is not completely frozen. A hatched area P in FIG. 5 indicates an area where the housing 1 is deformed in a bulging shape.

  The c → f → g line shows an example of a sales or usage mode of a completely frozen liquid storage product. This is based on the assumption that only a small amount of the completely frozen content liquid is thawed as shown in the c → f line and used for drinking, etc., but it is opened at the point f (α = 0.85). However, in the most extreme case, the volume of the casing 1 decreases along the f → g line, although the bulging deformation state of the casing 1 returns to the state before the deformation and depends on the frozen state. , The amount of content liquid corresponding to the height of f−g may be blown out or may flow out.

On the other hand, the c → e → h line shows another example of sales or usage of a liquid storage product that has been completely frozen, and is an example of opening after thawing to nearly half (α = 0.55). In the case of this example, the volume of the content liquid (corresponding to the height position of the i point) is already smaller than 530 ml, which is the full volume C _OF of the housing 1, at the time of opening (point h). There is no fear of leaking.

In this way, the full volume C _OF of the housing 1 is set so as to satisfy the condition of the expression (1) while referring to the data of FIG. By implementing the shape design of the body 1, it is possible to prevent the content liquid from being blown out or flowing out. For example, when the usage mode such as the c → f → g line described above is assumed, it is necessary to set the full volume C _OF to 540 ml or more, and further, from the completely frozen state to the considerably thawed state. If it is not determined, it is necessary to make it 545 ml or more at the point c which is a completely frozen volume in consideration of safety.

Next, based on the housing 1 of the first embodiment, the expression (2) will be specifically described.
ΔC _cr > (v _sf / v _sl ) V ₁ −C _OF + βV _h (2)
_(Here, a _{V h = C OF -V l.} )
This equation (2) is the deformation mode of the casing 1 in the completely frozen state (α = 1) in which the casing 1 in FIG. That is, the design guideline of the housing shape for presenting the bulging deformation within the preset allowable range is presented.

Specifically, the content liquid is water, the predetermined reference temperature Tr is 20 ° C., the full volume C _OF of the housing 1 is 530 ml, the content liquid filling volume V _l is 500 ml, and the head space volume V _h is 30 ml. And Note that since V _h = C _OF −V _l, V _l , V _h , and C _OF are not determined independently.

The coefficient β is a coefficient that expresses the ratio of the volume that cannot be used for absorption of the volume increment due to freezing in the head space volume V _h as a value of 0 to 1, and can be determined mainly by the seal strength (pressure resistance) of the cap. The higher the sealing strength, the more the gas in the head space can be compressed, and β can be made closer to zero. In this embodiment, the maximum sealing strength of the cap is 196.1 KPa (2 kgf / cm ² ) (three times the atmospheric pressure), and β is 0.33 according to Boyle-Charles' law.

In this way, v _sf and v _sl are determined by the contents liquid, V _l and β are determined from the product specifications of the liquid storage product, C _OF is determined from equation (1), and V _h is determined from V _l and C _OF. The value on the right side of the equation (2) is calculated based on the value to be 20 ml, and at the time of complete freezing, the volume increment of 45 ml due to complete freezing (calculated by (v _sf / v _sl ) V ₁ −V ₁ ) is 20 ml. Must be absorbed by the bulging deformation of the housing 1.

In other words, the formula (2) becomes _{ΔC cr} > 20 ml, and the allowable limit is within a range in which the liquid storage product can be safely stored and used and the merchantability is not impaired by the distorted bulging deformation. It can be seen that the shape of the housing 1 may be designed so that the limit volume increment ΔC _cr, which is the volume increment in this modification, is 20 ml or more.

Hereinafter, the limit volume increment ΔC _cr will be described for the _housing 1 of the first embodiment. The casing 1 of this example is basically a non-circular body 4 having a flat cross-sectional shape deformed into a perfect circular shape, thereby increasing the cross-sectional area to increase the capacity of the casing and freezing the content liquid. It is intended to absorb the volume increase.

  The extent to which the volume increment (hereinafter referred to as ΔC) of the housing 1 due to the deformation of the body 4 can be made depends on the plane cross-sectional area Sa and the plane cross-section at an arbitrary height of the body. Sc / Sa (hereinafter referred to as Rs value), which is the ratio of the area Sc of a perfect circle having the same circumference as the circumference, can be estimated as an index indicating the degree of non-perfect circle.

That is, for example, if the Rs value is 1.1 on average over the entire height range of the body part 4, the volume corresponding to the body part 4 is 1.1 times by deforming the flat cross section into a perfect circle. Is expected to be able to. Compared with the value of volume increase ratio v _sf / v _sl = 1.09 due to complete freezing of water, it is estimated that the volume increase can be absorbed substantially by the 1.1-fold volume increase. The

  Incidentally, when this Rs value is seen for several flat cross-sectional shapes, the regular polygon is a regular triangle 1.62, a regular tetragon 1.27, a regular hexagon 1.08, and a regular octagon 1.05. . The ellipse has a major axis / minor axis of 1.5 and an ellipse of 1.06, and the major axis / minor axis of 2.0 has a value of 1.19.

  In the housing 1 of the first embodiment, as can be seen from FIG. 3, the flat cross-sectional shape is a non-true circle over the entire height of the body 4, but the Rs value related to the non-true circle is the center height position. The range is from 1.06 to 1.09 at the upper end and the lower end, and the average value is 1.075. Here, the internal volume corresponding to the height range of the body 4 is approximately 400 ml, and a volume increment of about 30 ml (400 ml × 0.075) can be expected by deforming the body 4 into a perfect circle. .

Further, as described above, the limit volume increment ΔC _cr is an amount determined in relation to the product design to what extent bulging deformation is allowed, that is, the casing 1 of the first embodiment. The freezing of the content liquid is predicted to be deformed so that the flat cross-sectional shape of the body 4 is a perfect circle, and is significantly distorted from the viewpoint of a sense of security or impression given to the user. Even if this limit volume increment ΔC _cr is determined in the range where there is no, the condition of _{ΔC cr} ≧ ΔC> (calculated value on the right side of the formula (2)) is satisfied, and as a result, the housing is also frozen by freezing with the content liquid It can be estimated that the deformation of 1 can be within a predetermined range.

Here, the casing 1 of the first embodiment (filled volume C _OF 530 ml) is filled with 500 ml of water at 20 ° C., the headspace is 30 ml, sealed with a cap, and placed in the freezer in an upright state. An experiment was conducted to freeze water. The shape of the body 4 of the housing 1 is in a state where the flat portion is bulged as a whole, and the cross-sectional shape at the central height position is the same circumference as the flat cross-sectional shape before deformation indicated by a two-dot chain line in FIG. It was a shape close to a perfect circle with no significant distortion.

  6 and FIG. 7 shows another embodiment, which is a biaxial stretch blow-molded round 350 ml PET resin housing, which is formed on the upper end portion and the lower end portion of the body portion 4. In addition to the circumferential groove 7 being provided, a concave panel 6 is formed by denting the body wall at six locations symmetrical about the central axis over substantially the entire height range.

Formula (1) described in the first embodiment is the same as that described in FIG. 5 in the first embodiment in this embodiment as well. The injection capacity C _OF can be determined.

Explaining the formula (2), the full volume C _OF of the casing 1 of this embodiment is 367 ml, and the casing 1 is filled with 350 ml of water at 20 ° C. (V _l = 350 ml). V _h was set to 17 ml, sealed with a cap, placed in a freezer in an upright state, and an experiment was performed in which the water inside freezes, but the panel 6 as a concave portion was directed outward (in the direction of the white arrow in FIG. 7). It became a bulging state (see the two-dot chain line in FIG. 7).

Assuming that β is 0.33 as in the first embodiment, the calculated value on the right side of Equation (2) is 20.2 ml. Here, if the bulge-like deformation of the panel 6 as shown in FIG. 7 is permitted, the condition that the limit volume increment ΔC _cr > 20.2 ml is satisfied, while the security given to the user. Alternatively, from the viewpoint of impression and the like, it is determined that the above condition is not satisfied in the case of such an application in which such bulging deformation exceeds an allowable range.

Even in the case 1 having the shape as in the present embodiment, it is not necessary to mold the case 1 and to perform a freezing test thereof. The limit volume increment ΔCcr corresponding to the volume increment ΔC in the allowable limit deformation mode is determined while observing the volume increment ΔC and the deformation mode of the housing 1, and ΔC _cr > (formula ( 2) It is possible to determine whether or not a single-shaped housing including the thickness can be used for the intended use depending on whether or not the condition of (the calculated value on the right side) is satisfied.

  In the above description of the embodiment, the description has been given from the viewpoint of the design of the shape of the housing. The present invention provides design guidelines for designing a liquid storage product for the purpose of freezing and selling and using the content liquid in a state where the mouth tube portion is sealed.

That is, for example, if the usage mode such as the shape of the housing to be used and how much to freeze is used, the filling volume V _l and the head space volume V _h can be adjusted accordingly. On the other hand, once the usage mode is determined, the product design of the liquid storage product can be implemented in various modes, such as adjusting the shape of the housing and the ratio of the filling volume V ₁ and the head space volume V _h according to the usage mode. It is also possible to design a total product for use that is frozen and sold from the beginning.

  In addition, the effectiveness of the design index related to the shape of the synthetic resin housing that is used by freezing the liquid of the present invention is not limited to the housing shape, the liquid storage product, or the PET resin of the above embodiment. Absent.

As described above, according to the present invention, the liquid storage product can be safely stored and used in a frozen state, and the liquid storage product can be provided without impairing the merchantability of the liquid storage product. A wider range of uses is expected in the field of freezing and using liquids.

It is a front view which shows 1st Example of the housing of this invention. It is a side view of the housing of FIG. FIG. 1A is a cross-sectional view taken along line BB and CC in FIG. 1, and FIG. 1B is a cross-sectional view taken along line A-A in FIG. c) It is a bottom view. It is explanatory drawing which compares and shows the circular which has the same periphery in the plane sectional view of FIG.3 (b). Explanatory drawing which shows the volume and the change of a volume in the graph in the freezing and thawing | decompression process of a content liquid. It is a front view which shows 2nd Example of the housing of this invention. FIG. 7 is a plan sectional view taken along line DD in FIG. 6.

DESCRIPTION OF SYMBOLS 1; Housing 2; Mouth part 3; Shoulder part 4; Trunk part 5; Bottom part 6; Panel 7; Circumferential groove BB; Flat cross section CC: Flat cross section R1; Radius of curvature R2: Radius of curvature L; HL: Liquid level

Claims (1)

The product is intended to be sold and used by filling the synthetic resin housing with the content liquid and sealing the mouth tube, and the body section has a flat cross-sectional shape. A liquid storage product in which the relationship between the circular casing shape and the filling amount of the content liquid satisfies the conditions shown in the following formulas (1) , (2) and (3) .
C _OF > α (v _sf / v _sl ) V _l + (1−α) V _l (1)
ΔC _cr > (v _sf / v _sl ) V ₁ −C _OF + βV _h (2)
(Rs (Ave) -1) Vb> ΔC _cr (3)
However, C _OF is the full injection volume at the predetermined reference temperature _Tr of the casing, _{ΔC cr} is the limit volume increment in a preset bulged limit deformation state, and V _l is the predetermined content liquid filled in the casing. volume at the reference temperature T _r, V _h headspace volume at a predetermined reference temperature T _r in the bottle, v _sl is the specific volume at a given reference temperature T _r of the liquid content, v _sf is in full frozen state of the liquid content The specific volume, α is a weight ratio of the frozen portion (takes a value in the range of 1 to 0), and β is a coefficient indicating a value in the range of 1 to 0. Also a medium equation _{(2) V h = C OF} -V l.
In addition, Rs (Ave) in the formula (3) is a ratio between the plane cross-sectional area Sa at an arbitrary height of the body of the housing and the area Sc of a perfect circle having the same circumference as the circumference of the plane cross-section. The average value of Sc / Sa, Vb, is the inner volume of the body.

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