JP2016150770A - Squeeze bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a squeeze bottle of a simple shape capable of constantly regulating discharge amount without using a regulating member.SOLUTION: A squeeze bottle 1 is equipped with a body portion 4 having a narrowed portion 6. Positions A and B at both ends of the narrowed portion 6 are positions where the circumferential length of the body portion 4 starts decreasing toward the deepest position C of the narrowed portion 6, and a distance between both ends of the narrowed portion 6 is not less than a value obtaining by dividing virtual circumferential length of the body portion 4 at the same position as the deepest position C of the narrowed portion 6 when assuming that the narrowed portion 6 does not exist, by a circumference ratio. The circumferential length at the deepest position C of the narrowed portion 6 is 80-90[%] of the virtual circumferential length of the body portion 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a synthetic resin squeeze bottle having a cylindrical body and formed by blow molding.

  2. Description of the Related Art Conventionally, squeeze bottles that have a squeeze property that are easily deformed by pressing a side surface with a finger or the like and return to an original shape when an external force is removed are known. In addition, such a squeeze bottle is also known which enables a fixed amount discharge that discharges a predetermined amount of content liquid.

  For example, in the squeeze bottle disclosed in Patent Document 1, fixed discharge is enabled by attaching a restricting member that restricts the maximum deformation amount to a constant value when squeezed. Moreover, in the squeeze bottle disclosed in Patent Document 2, it is possible to perform constant discharge by devising the shape of the container regardless of the regulating member.

JP 2004-352345 A JP 2011-105360 A

  However, according to the squeeze bottle of the above-mentioned Patent Document 1, since the structure is complicated, not only the cost of the regulating member that regulates the discharge amount constant, but also the processing cost increases. Moreover, according to the squeeze bottle of the above-mentioned Patent Document 2, since the discharge amount is regulated to be constant depending on the container shape, the container shape is somewhat special, and there are restrictions on the design surface and the range of the discharge amount that can be set. large.

  An object of the present invention is to provide a squeeze bottle having a simple shape that can regulate the discharge amount to be constant without using a regulating member, in view of the problems of the prior art.

  The squeeze bottle of the present invention is a squeeze bottle made of synthetic resin that has a cylindrical body part and is formed by blow molding, wherein the body part has a constricted part, and the positions of both ends of the constricted part are , A position where the circumference of the body starts to decrease toward the deepest position of the constricted portion, and the distance between both ends of the constricted portion is the position of the body when it is assumed that the constricted portion does not exist. It is not less than the value obtained by dividing the virtual circumference at the same vertical position as the deepest position by the circumference, and the circumference at the deepest position of the constricted portion is 80 to the virtual circumference of the trunk portion. It is 90 [%].

  According to the present invention, when a squeeze bottle is squeezed, a substantially constant amount of deformation can be generated in the squeeze bottle by pushing the constricted portion of the squeeze bottle with a finger until a certain amount of drag is felt rapidly. . Then, pressing until a certain increase in drag is felt is easier to reproduce repeatedly than when pressing until a certain drag occurs when the drag increases linearly.

  In the present invention, this rapid increase in the drag force is achieved by providing the constricted portion having the above-described form in the trunk portion of the squeeze bottle. That is, when the ratio of the circumference at the deepest part of the constricted part to the virtual circumference of the body part is less than 80 [%], the drag increases linearly with a large increase rate with respect to the deformation amount. A sudden increase is not felt, and the amount of deformation with respect to the pushing force is small. Therefore, it may be difficult to obtain an appropriate amount of deformation repeatedly.

  On the other hand, when the perimeter ratio exceeds 99 [%], the amount of deformation with respect to the pushing force is large, but even when pushed to some extent, the drag does not increase, and a rapid increase in the drag is not felt. Accordingly, in this case as well, it may be difficult to obtain an appropriate amount of deformation repeatedly. Therefore, in the present invention, the circumference ratio is limited to a range of 80 to 99 [%].

  In addition, when the distance between both ends of the constricted portion, that is, the length of the constricted portion is less than the value obtained by dividing the virtual circumference of the body portion by the circumference, the length of the constricted portion is equal to or greater than the value. Compared to a certain case, the drag tends to increase linearly with a large increase rate with respect to the deformation amount. Therefore, as in the case where the circumference ratio is less than 80 [%], a rapid increase in the drag force is not felt, and the amount of deformation with respect to the pushing force tends to be small, so that it is difficult to repeatedly obtain an appropriate amount of deformation. There is a risk. Therefore, in the present invention, the length of the constricted portion is limited to a value equal to or larger than the value obtained by dividing the virtual circumferential length of the body portion by the circumference ratio.

  Therefore, according to the present invention, it is possible to provide a squeeze bottle having a simple shape that can regulate the discharge amount uniformly without using a regulating member by providing the constricted part with respect to the body part of the squeeze bottle. it can.

  In the present invention, the material of the squeeze bottle may be polyethylene terephthalate, high-density polyethylene, or polystyrene. According to this, due to the property as a hard plastic, the function of the constricted portion can be exhibited without hindrance, and the discharge amount can be made constant with a good squeeze feeling.

It is a front view of the squeeze bottle which concerns on one Embodiment of this invention. It is a figure which shows the cross section in the deepest position of a constriction part about a constriction part and a trunk | drum in the case of assuming that a constriction part does not exist. It is a graph which shows the relationship between the deformation | transformation amount and reaction force at the time of the squeeze of the squeeze bottle which concerns on Examples 1-3, 8, 10, and Comparative Examples 1 and 2. It is a figure which shows an example of the container model which modeled the squeeze bottle in order to investigate the relationship between the deformation | transformation amount and reaction force at the time of the squeeze of a squeeze bottle by a finite element method. It is a graph which shows the result of having investigated the relationship between deformation amount and reaction force by the finite element method about the container model which concerns on Examples 11-15 and Comparative Examples 4-8.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the squeeze bottle 1 according to the embodiment includes a discharge port 2 provided at an upper end, a shoulder 3 connected to the discharge port 2, a body 4 connected to the shoulder 3, and a body 4. And a continuous bottom 5.

  The squeeze bottle 1 is formed by blow molding using a synthetic resin as a raw material. As a material used for this blow molding, a hard plastic represented by PET (polyethylene terephthalate), HDPE (high density polyethylene), and PS (polystyrene) can be used.

  The body portion 4 has a constricted portion 6. The positions A and B at both ends of the constricted part 6 are positions where the circumferential length of the body part 4 starts to decrease toward the deepest position C of the constricted part 6. In the present embodiment, the squeeze bottle 1 is rotationally symmetric with respect to the central axis AX, has a circular cross section, and a portion of the body portion 4 other than the constricted portion 6 has a constant diameter. Therefore, both end positions A and B of the constricted portion 6 are reduced diameter starting positions where the diameter of the body portion 4 starts to decrease toward the deepest position C.

  In the case of a tapered bottle type squeeze bottle in which the body portion 4 is tapered toward the upper portion, the circumference of the body portion 4 also changes in portions other than the constricted portion 6, but the change The positions at which the degree starts to change are “positions at which the circumference of the body portion 4 starts to decrease toward the deepest position C of the constricted portion 6”, and are both end positions A and B of the constricted portion 6.

  Assuming that the portion corresponding to the constricted portion 6 of the body portion 4 when the constricted portion 6 does not exist is a virtual portion 4a, the virtual portion 4a is a portion other than the constricted portion 6 as represented by a two-dot chain line. It is shown as a part which extended the part of the trunk | drum 4 linearly as it is. In other words, in the longitudinal section of the constricted portion 6, the portion of the body portion 4 when it is assumed that the constricted portion 6 does not exist is represented by a straight line connecting both end positions A and B of the constricted portion 6.

  The circumference of the virtual portion 4a at the deepest position C shown in FIG. 2 is assumed to be a virtual circumference Ci, and the distance between the end positions A and B of the constricted portion 6, that is, the length of the constricted portion 6 as shown in FIG. If L, then L ≧ Ci / π holds. That is, the length L of the constricted portion 6 is obtained by dividing the virtual circumferential length Ci at the same vertical position as the deepest position C in the trunk portion 4 when the constricted portion 6 is not present by the circumference ratio. It is greater than or equal to the value.

  In the case of this embodiment, the squeeze bottle 1 has a circular cross section, and the portion other than the constricted portion 6 of the body portion 4 has a constant diameter. Therefore, the value obtained by dividing the virtual circumference Ci by the circumference ratio is equal to the constant diameter.

  Unlike the present embodiment, when the length L of the constricted portion 6 is smaller than the value obtained by dividing the virtual circumferential length Ci by the circumference (L <Ci / π), the constricted portion 6 functions as a reinforcing rib. There is a risk that the deformation of the squeeze bottle 1 may be suppressed. In this case, the flexibility of the squeeze bottle 1 is lost, and a good squeeze property cannot be obtained, and the content liquid in the squeeze bottle 1 cannot be easily discharged, which is not preferable.

  In this embodiment, if the circumference of the constricted portion 6 at the deepest position C shown in FIG. 2 is the minimum circumference Cmin, and the ratio of the minimum circumference Cmin to the virtual circumference Ci is the circumference ratio α. The preferable range of the circumference ratio α is 80 to 99 [%]. 80 to 98 [%] is more preferable.

  That is, even if the circumferential length of the constricted portion 6 is slightly reduced, it is possible to effectively prevent the occurrence of buckling such that the deformation pattern of the squeeze bottle 1 at the time of squeezing is suddenly changed and bent. On the other hand, although it varies slightly depending on the shape of the constricted portion 6 and the like, if the circumference ratio α is larger than 99%, the reaction force from the squeeze bottle 1 is sufficiently increased even if the squeeze bottle 1 is squeezed. Without it, it becomes difficult to discharge the liquid content of the squeeze bottle 1 in a reproducible amount only. Therefore, the minimum peripheral length Cmin of the constricted portion 6 needs to be 99% or less, preferably 98% or less, of the virtual peripheral length Ci of the body portion 4.

  On the other hand, as the minimum circumference Cmin of the constricted portion 6 is reduced, the reaction force against the initial deformation of the squeeze bottle 1 during squeeze gradually decreases, but at the same time, the amount of deformation until the reaction force increases rapidly, that is, the squeeze possible range. Gradually decreases and the maximum discharge amount decreases. When the minimum circumference Cmin is further reduced, the reaction force against the initial deformation increases again, and finally the squeeze property is completely lost.

  Therefore, although slightly different depending on the detailed shape of the constricted portion 6 and other portions of the squeeze bottle 1, the ratio of the minimum circumferential length Cmin of the constricted portion 6 to the virtual circumferential length Ci of the body portion 4 is generally less than 80%, particularly 78. If it is less than%, the squeezable range will be extremely narrow. In this case, the squeeze bottle 1 is insufficient as a squeeze container or a container for quantitative discharge in which a fixed amount of content liquid protrudes for each squeeze.

  The discharge amount of the squeeze bottle 1 by one squeeze operation is such that the height, diameter and other dimensions of the squeeze bottle 1, the dimensions related to the shape such as the circumferential length ratio α and length L of the constricted part 6, and the vicinity of the constricted part 6 It can be easily set by any one of the wall thicknesses or the like, or a combination thereof. For example, if the virtual circumference Ci and the height of the body 4 of the squeeze bottle 1 are the same, the discharge amount decreases as the circumference ratio α decreases. In addition, the thick-walled squeeze bottle 1 has a larger reaction force during deformation than the thin-walled squeeze bottle 1, and therefore the discharge amount is small.

  The extremely thick squeeze bottle 1 is too rigid and has a small deformation amount during squeeze, and the extremely thin squeeze bottle 1 is easily buckled during squeeze, so that neither is suitable for quantitative discharge. However, it is not difficult to select a thickness that can be squeezed with a relatively weak force and does not easily buckle even if strongly squeezed. By selecting such a thickness, the squeeze bottle 1 that is suitable for quantitative discharge is configured. can do.

  It should be noted that a reinforcing rib, a panel, or the like may be provided on the squeeze bottle 1 as long as the squeeze property and the quantitative discharge property are not impaired due to a request for design, function, or the like.

  In this configuration, when the squeeze bottle 1 is used, a cap having a nozzle having a diameter of about 3 mm is attached to the discharge port 2 of the squeeze bottle 1 filled with the content liquid. Then, by squeezing (pushing) the constricted portion 6 with a finger or the like with an appropriate force and deforming the constricted portion 6, the content liquid in the squeeze bottle 1 can be discharged from the nozzle.

  At this time, since the constricted portion 6 is configured as described above, the squeeze bottle 1 is easily and smoothly deformed without causing folds or buckling around the portion to be deformed. If it is deformed until it exceeds a certain amount of deformation, the reaction force increases rapidly. By sensing this reaction force and stopping the squeeze operation, a substantially constant amount of the content liquid can be discharged from the squeeze bottle 1.

  When the squeeze operation is stopped and the pressing force is released, the squeeze bottle 1 is restored to its original shape. Thereby, the quantitative discharge by one squeeze operation is completed. By repeating such a squeeze operation, it is possible to discharge a substantially constant amount of content liquid from the squeeze bottle 1 each time with good reproducibility.

[Examples 1 to 3, Comparative Examples 1 and 2]
Each of the squeeze bottles 1 made of PET (polyethylene terephthalate) having a constricted part 6 having a circular cross section and a gentle constriction at the center part of the trunk part 4 and slightly above by the injection stretch blow method. Were prepared as Examples 1 to 3 and Comparative Examples 1 and 2, respectively.

  The volume of the squeeze bottle 1 in each example, the diameter of the body 4 other than the constricted part 6, the minimum diameter of the constricted part 6, the circumference ratio α (Cmin: Ci), the length L of the constricted part 6 and the meat of the constricted part 6 The thicknesses are shown in the columns of “capacity”, “body diameter”, “minimum diameter”, “peripheral length ratio”, “neck length” and “neck wall thickness” in Table 1, respectively. Throughout Examples 1 to 3 and Comparative Examples 1 and 2, the values of “capacity”, “body diameter”, and “neck wall thickness” are the same.

  Next, each squeeze bottle 1 filled with the content liquid was squeezed (pressed) on the constricted portion 6 until a predetermined reaction force was generated, thereby examining the squeeze property, the quantitative discharge property, and the discharge amount. The results are shown in the columns of “squeeze property”, “quantitative discharge property” and “discharge amount” in Table 1.

  Here, the squeeze investigation is to evaluate whether it is easily deformed by pushing from the side with fingers or the like, and returns to the original shape when the pushing force is released. If the deformation cannot be deformed, or if the deformation pattern is suddenly changed and buckling occurs so that it bends, “x” is entered in the “Squeeze property” column of Table 1.

  With regard to the quantitative discharge performance, the discharge amount when the squeeze bottle 1 is squeezed a plurality of times with a normal force is gathered to a substantially constant value, and there may be a difference in the discharge amount due to a pressing position or an error in force. In the column of “quantitative dischargeability” in Table 1, “◯” is indicated when the difference is 5 [mL] or less, and “x” is indicated otherwise. In the “discharge amount” column of Table 1, values of the minimum discharge amount and the maximum discharge amount obtained as a result of a plurality of trials under the same conditions for each squeeze bottle 1 are shown.

  As shown in Table 1, the squeeze bottle 1 of Example 1 is good in both “squeeze property” and “quantitative discharge property”. However, since the “peripheral length ratio” is 80.0 [%] and is slightly hard, the “discharge amount” is slightly small, being 10 to 14 [mL]. Therefore, it is suitable for dispensing a relatively small amount of content liquid.

  The squeeze bottle 1 of Example 2 has good “squeeze property” and “quantitative discharge property”, and the “discharge amount” is 54 to 57 [mL]. Therefore, it is suitable for quantitatively discharging a larger amount of the content liquid than the squeeze bottle 1 of the first embodiment.

  The squeeze bottle 1 of Example 3 has a “circumference ratio” close to 100 [%], but both “squeeze property” and “quantitative discharge property” are good, and “discharge amount” is 119 to 123 [mL]. . Therefore, it is suitable for dispensing a larger amount of content liquid than the squeeze bottle 1 of the second embodiment.

  On the other hand, in the squeeze bottle 1 of Comparative Example 1, the “peripheral length ratio” is 100%, and the constricted portion 6 does not exist. In this squeeze bottle 1, buckling occurred in which a portion pressed during squeeze was bent. In addition, even if it is greatly deformed, the increase in the reaction force is small, so that the discharge amount varies and good reproducibility cannot be obtained. Therefore, both “squeeze property” and “quantitative discharge property” are poor, and it is not suitable for the purpose of quantitative discharge.

  Compared with Example 1, the squeeze bottle 1 of Comparative Example 2 has a “smallest diameter” and “peripheral length ratio” that are slightly smaller. For this reason, since the squeeze bottle 1 is harder than the first embodiment and the deformable range is narrow, both “squeeze property” and “quantitative discharge property” are poor, and the discharge amount is smaller than the capacity of the squeeze bottle 1. Extremely few. Therefore, it is not suitable for use in quantitative discharge.

  From the results of Examples 1 to 3 and Comparative Examples 1 and 2 above, when the “peripheral length ratio” is less than 80.0 [%] or exceeds 98.3 [%], “squeeze property” and It can be seen that there is a possibility that the “quantitative dischargeability” may be poor. It can also be seen that the greater the “peripheral length ratio”, the greater the discharge amount, that is, the greater the squeeze amount.

[Examples 4 and 5]
Next, in order to investigate the influence of “neck wall thickness”, squeeze bottles 1 different only in “neck wall thickness” were prepared as Examples 4 and 5, and “squeeze property” and “quantitative discharge property” were similarly set. Evaluation and discharge amount were measured. The results are shown in Table 2 in the same manner as in Table 1.

  As shown in Table 2, “squeeze property” and “quantitative discharge property” were good in both Examples 4 and 5, and “discharge amount” was 63 to 66 [mL] and 30 to 34 [mL], respectively. . From this result, it can be seen that the smaller the “neck portion thickness”, the larger the discharge amount. That is, it can be seen that the amount to be discharged quantitatively can be adjusted by selecting the thickness of the constricted portion 6.

[Examples 6 and 7]
Next, in order to investigate the influence of the capacity of the squeeze bottle 1, as in Examples 6 and 7, the “capacity” is 300 [mL] and 750 [mL], respectively, and the “periphery ratio” is substantially the same value. A squeeze bottle 1 having a value corresponding to the value of “capacity” as another item value was created, and “squeeze property” and “quantitative discharge property” were evaluated in the same manner, and the discharge amount was measured. The results are shown in Table 3.

   As shown in Table 3, “squeeze property” and “quantitative discharge property” were good in both Examples 6 and 7, and “discharge amount” was 30 to 32 [mL] and 75 to 80 [mL], respectively. . From this result, it is understood that if the “peripheral length ratio” is substantially the same, a discharge amount substantially corresponding to the capacity of the squeeze bottle 1 can be obtained.

[Examples 8 and 9]
Next, two types of squeeze bottles 1 having an elliptical cross section and capacities of 400 [mL] and 240 [mL] were prepared as Example 8 and Example 9, respectively. The long and short diameters of the body portion 4 other than the constricted portion 6 of each squeeze bottle 1, the long diameter and short diameter of the portion where the circumference of the constricted portion 6 is minimum, the length L of the constricted portion 6, and the thickness of the constricted portion 6 Are shown in the columns of “Cylinder long diameter”, “Cylinder short diameter”, “Constriction long diameter”, “Constriction short diameter”, “Perimeter length ratio”, “Constriction length” and “Constriction thickness” in Table 4.

  Next, by squeezing (pressing) each squeeze bottle 1 filled with the content liquid along the short diameter of the constricted portion 6 until a predetermined reaction force is generated, squeeze property, quantitative discharge property, and discharge amount I investigated. The results are shown in the columns of “Squeeze property”, “Quantitative discharge property” and “Discharge amount” in Table 4.

  As shown in Table 4, in both cases of Examples 8 and 9, “squeeze property” and “quantitative discharge property” were good “◯”, and a constant amount discharge corresponding to the capacity could be performed. Further, the “trunk length” and “neck length” in Example 8 are substantially equal to the “trunk diameter” and “minimum diameter” in Example 2, respectively, and the “peripheral length ratio” and “neck wall thickness” in Example 8 are used. Is substantially equal to the “peripheral length ratio” and “neck wall thickness” of the second embodiment, but the “discharge amount” of the eighth embodiment is slightly smaller than the “discharge amount” of the second embodiment.

  Regarding this, it is considered that the squeeze bottle 1 of Example 8 is related to the fact that the cross section has an elliptical shape, or that the capacity thereof is smaller than that of the squeeze bottle 1 of Example 2. The same can be said for Example 9 in comparison with Example 6.

[Example 10, Comparative Example 3]
Two types of squeeze bottles 1 are formed as Example 10 and Comparative Example 3 as taper bottles whose diameter decreases in a tapered manner toward the shoulder 3, respectively. "Evaluation" and the discharge amount was measured. The results are shown in Table 5 in the same manner as in Table 1. The squeeze bottles 1 of Example 10 and Comparative Example 3 differ from each other only in the values of “minimum diameter” and “peripheral length ratio”.

  In Example 10 in which the “peripheral length ratio” was 90.5 [%], both “squeeze property” and “quantitative discharge property” were good, and the “discharge amount” was 68 to 71 [mL]. On the other hand, in the case of the comparative example 3 whose “circumference ratio” is 78.2 [%], both “squeeze property” and “quantitative discharge property” are poor, and the “discharge amount” is 3 to 5 [mL]. Met. Therefore, even when the squeeze bottle 1 is a taper bottle, it can be seen that if the circumference ratio has an appropriate value, it is suitable for a fixed-quantity discharge application.

  FIG. 3 is a graph showing the relationship between the deformation amount and the reaction force measured when evaluating “squeeze property” and “quantitative discharge property” in Examples 1 to 3, 8, and 10 and Comparative Examples 1 and 2. The “deformation amount (mm)” on the horizontal axis is the diameter (in the case of Examples 1 to 3 and Comparative Examples 1 and 2) or the short diameter (in Examples 8 and 10) of the constricted part 6 pushed for squeezing. The amount of deformation. The “reaction force (N)” on the vertical axis is a reaction force received from the constricted portion 6 when the constricted portion 6 is pushed for squeezing.

  As can be understood from FIG. 3, in Examples 1 to 3, 8, and 10, the reaction force deforms relatively large while the reaction force at the start of pressing is small, and the reaction force suddenly increases as the deformation proceeds to some extent. It turns out that it is in the tendency. Therefore, by performing squeeze until an increase in the reaction force is felt, a substantially constant deformation amount can be obtained, and a substantially constant amount of content liquid can be discharged.

  Further, as the “peripheral length ratio” is closer to 100 [%], the amount of deformation until the reaction force increases rapidly increases. That is, it can be seen that a larger squeeze amount (deformation amount) can be obtained with a constant pressing force, for example, 25 [N], and a fixed amount discharge can be performed with a larger discharge amount.

  On the other hand, unlike the other graph curves, the graph curve of Comparative Example 1 having a “perimeter ratio” of 100 [%] has an extra inflection point at a location where the deformation amount is about 15 [mm]. In this case, it can be seen that buckling occurs in which the squeeze bottle 1 is bent. In addition, the reaction force does not increase so much even if the amount of deformation increases, and it can be seen that it is difficult to finish the squeeze by feeling a sudden increase in the reaction force. Therefore, it is understood that Comparative Example 1 is poor in “squeeze property” and “quantitative discharge property”.

  In the case of Comparative Example 2 in which the “peripheral length ratio” is 76.7 [%], which is smaller than 80.0 [%], the reaction force increases linearly with respect to the deformation amount. Therefore, even if it is squeezed until a constant reaction force, for example, a reaction force of 25 [N] is obtained, only a slight amount can be discharged. Therefore, it is understood that the squeeze bottle 1 of the comparative example 2 is not suitable for the application of fixed quantity discharge.

[Examples 11-15, Comparative Examples 4-8]
In order to investigate the influence of the length of the constricted portion 6 on the relationship between the deformation amount and the reaction force when the squeeze bottle 1 is squeezed by the finite element method, the diameter of the body portion 4 other than the constricted portion 6 is constant. As the container model 7 in which the squeeze bottle 1 is modeled as shown in FIG. 4, 10 types having the dimensions of each part as shown in the columns of Examples 11 to 15 and Comparative Examples 4 to 8 in Table 6 were prepared. .

   As shown in FIG. 4, the diameters of the upper end and the lower end of the constricted portion 6 of each container model 7 are equal, and represent the diameters of the portions other than the constricted portion 6 of the body portion 4 in each container model 7. The values of the diameters of the upper end and the lower end are 60 [mm] for all the container models 7 as shown in the “upper diameter” and “lower diameter” columns of “body diameter” in Table 6, respectively.

  The diameter at the deepest part of the constricted portion 6 of each container model 7 is equal to 54 [mm] in all the container models 7 as shown in the column of “constricted diameter” in Table 6. Therefore, the circumference ratio described above is 90 (= 100 × 54/60) [%] in all container models 7 as shown in the column of “circumference ratio”.

  The constricted portion 6 of each container model 7 includes an upper R portion 6a, a lower R portion 6b, and a constricted R portion 6c. In the cross section of FIG. 4, the upper R portion 6 a is shown as a circular arc portion having a radius R in contact with the outer shape line of the body portion 4 portion connected to the upper side of the constricted portion 6. The lower R portion 6 b is shown as a circular arc portion having a radius R in contact with the outer shape line of the body portion 4 portion connected to the lower side of the constricted portion 6. The constricted R portion 6c is shown as an arc portion having a radius r in contact with both arc portions having the radius R.

  The radii R of the upper R portion 6 a and the lower R portion 6 b of each container model 7 have the same value as shown in the “Upper R” and “Lower R” columns of Table 6. The radius of the constricted R portion 6c is the same for all the container models 7, and is 60 [mm] as shown in the column “Constricted r”. The distance between both ends of the constricted portion 6 of each container model 7, that is, the length of the constricted portion 6 has a value shown in the “constricted length” column of Table 6. The ratio of the “neck length” to the “body diameter” of each container model 7 is shown in the “neck length / body diameter” column of Table 6.

  Next, for each container model 7 shown in the columns of Examples 11 to 15 and Comparative Examples 4 to 8 in Table 6, the relationship between the deformation amount and the reaction force similar to those in FIG. 3 described above was examined by the finite element method. . The result is shown in FIG.

  As understood from FIG. 5, the larger the value of “neck length / body diameter” in Table 6, the smaller the amount of change in the reaction force with respect to the deformation amount, and the smaller the reaction force. It can be seen that a larger amount of deformation can be obtained before the increase. In particular, in the case of Examples 11 to 15 in which the value of “neck length / trunk diameter” is 100 [%] or more, this is more noticeable than Comparative Examples 4 to 8 that are less than 100 [%]. Therefore, it can be seen that the container models 7 of Examples 11 to 15 are suitable for quantitative discharge.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this. For example, the squeeze bottle of the present invention is not limited to a circular or elliptical cross section, but may be a polygon having a circular or nearly elliptical cross section.

  DESCRIPTION OF SYMBOLS 1 ... Squeeze bottle, 2 ... Discharge port, 3 ... Shoulder part, 4 ... Body part, 6 ... Constriction part, A, B ... Position of both ends of constriction part, C ... Deepest position of constriction part.

Claims (2)

A squeeze bottle made of synthetic resin that has a cylindrical body and is formed by blow molding,
The barrel has a constriction;
The positions of both ends of the constricted part are positions where the circumference of the trunk part starts to decrease toward the deepest position of the constricted part,
The distance between both ends of the constricted portion is equal to or greater than the value obtained by dividing the virtual circumference at the same vertical position as the deepest position in the trunk when the constricted portion is not present by the circumference. And
The squeeze bottle characterized in that a circumferential length at the deepest position of the constricted portion is 80 to 90% of a virtual circumferential length of the body portion.   The squeeze bottle according to claim 1, wherein the material is polyethylene terephthalate, high-density polyethylene or polystyrene.