Synthetic resin multiple squeeze bottle

Abstract

To provide a synthetic resin multiple squeeze bottle which can easily discharge contents, even when a remaining amount of the contents in an inner container body has become small in a final stage of use.SOLUTION: A synthetic resin multiple squeeze bottle 1 comprises an outer shell bottle 2 which is capable of returning to its original shape with respect to a pressing force, an inner container body 3 which is deformed by the pressing force, and a ventilation passage 23 which introduces outside air to an intermediate layer between the outer shell bottle 2 and the inner container body 3. A trunk pressing part 6 of the outer shell bottle 2 comprises a first truncated cone-shape part 6c whose diameter is linearly reduced toward a center part from a portion connected to a shoulder part 5, a second truncated cone-shape part 6d whose diameter is linearly reduced toward the center part from the portion connected to a bottom part 7, and a trunk pressing small diameter part 6e which connects a reduced-diameter part 6c1 of the first truncated cone-shape part 6c and a reduced-diameter part 6d1 of the second truncated cone-shape part 6d in a straight line.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a multi-squeeze bottle made of synthetic resin. [Background technology]

[0002] Conventionally, a multi-squeeze bottle made of synthetic resin has been known in which an inner container that reduces in volume and deforms when subjected to pressure (hereinafter referred to as "volume reduction and deformation") is placed inside an outer shell bottle that can return to its original shape when subjected to pressure, and outside air is introduced into the intermediate layer between the outer shell bottle and the inner container (see, for example, Patent Document 1).

[0003] The synthetic resin multi-squeeze bottle described in Patent Document 1 comprises an outer shell bottle having a cylindrical outer opening, a shoulder connected to the outer opening, a body pressing portion connected to the shoulder, a bottom connected to the body pressing portion, and a ground contact portion connected to the bottom, and being able to return to its original shape when pressed; an inner container having a cylindrical inner opening disposed on the inner periphery of the cylindrical outer opening, and an inner container body connected to the inner opening and shaped to fit the inner shape of the outer shell bottle; and an air passage formed between the outer opening and the inner opening to introduce outside air into the intermediate layer between the outer shell bottle and the inner container.

[0004] In the synthetic resin multi-squeeze bottle, when the body pressing portion of the outer shell bottle is pressed (squeezed), the pressing force from the outer shell bottle presses on the inner container body through the air in the middle layer, causing it to shrink and deform, and the contents are dispensed. Next, when the pressure from the body pressing portion of the outer shell bottle is released, a separately provided check valve or the like prevents outside air from entering the inner container. Because outside air is introduced into the middle layer between the outer shell bottle and the inner container through the air vent, the outer shell bottle returns to its original shape, while the inner container body remains in its shrinking, deformed state. Since the check valve or the like prevents outside air from entering the inner container, deterioration of the contents contained in the inner container due to oxidation during use is prevented.

[0005] In the synthetic resin multiple squeeze bottle, the body pressing portion of the outer shell bottle is hand-held, narrowing in diameter from the portion connecting to the shoulder portion toward the center and then expanding in diameter from the center toward the portion connecting to the bottom portion. Because the body pressing portion of the synthetic resin multiple squeeze bottle is hand-held, it is said that pressing and releasing the pressing can be easily performed by gripping the hand-held hand-held body pressing portion. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2019-018892 Summary of the Invention [Problem to be solved by the invention]

[0007] However, with the synthetic resin multi-squeeze bottle described in Patent Document 1, as described above, when the contents inside the inner container are repeatedly pressed and released by pressing the outer shell bottle, the contents inside the inner container gradually decrease, and as a result, the amount of outside air introduced into the intermediate layer formed between the outer shell bottle and the inner container increases. Therefore, when the amount of contents remaining inside the inner container becomes small toward the end of use of the synthetic resin multi-squeeze bottle, it becomes difficult for the outer shell bottle to press against the inner container through the intermediate layer, making it difficult to eject the contents, and there is an inconvenience that a large amount of contents remains when the contents are used up.

[0008] The reason why it becomes difficult to expel the contents towards the end of use of the synthetic resin multi-squeeze bottle is that as the amount of outside air introduced into the intermediate layer between the outer shell bottle and the inner container increases, the compressive volume change of the intermediate layer of the outer shell bottle required to expel the contents becomes greater, making it more difficult for the pressing force to be transmitted from the outer shell bottle to the inner container via the intermediate layer compared to the early stage of use of the synthetic resin multi-squeeze bottle; and when the amount of contents remaining is only small towards the end of use of the synthetic resin multi-squeeze bottle, the amount of volume reduction and deformation of the inner container body must be even greater in order to expel the contents, and therefore more pressing force on the outer shell bottle is required compared to the early stage of use of the synthetic resin multi-squeeze bottle.

[0009] Therefore, an object of the present invention is to provide a synthetic resin multi-squeeze bottle that can eliminate such inconveniences, can easily dispense the contents even when the amount of contents remaining in the inner container is small toward the end of use, and can minimize the amount of remaining contents when the bottle is used up. [Means for solving the problem]

[0010] To achieve the above object, the present invention provides a synthetic resin multi-squeeze bottle comprising an outer shell bottle having a cylindrical outer opening, a shoulder connected to the outer opening, a body pressing portion connected to the shoulder, a bottom connected to the body pressing portion, and a ground contact portion connected to the bottom, the outer shell bottle being resilient to its original shape when subjected to a pressing force; a cylindrical inner opening disposed on the inner periphery of the cylindrical outer opening of the outer shell bottle; an inner container body connected to the inner opening and shaped to fit the inner shape of the outer shell bottle, the inner container being deformed by a pressing force via an intermediate layer; and a shaped inner container between the outer opening and the inner opening. In the synthetic resin multi-squeeze bottle having an air passage for introducing outside air into the intermediate layer between the outer shell bottle and the inner container, the body pressing portion of the outer shell bottle is characterized by comprising: a first truncated cone-shaped portion whose diameter decreases linearly from the portion connected to the shoulder toward the center; a second truncated cone-shaped portion whose diameter decreases linearly from the portion connected to the bottom toward the center; and a body pressing small-diameter portion that connects the reduced-diameter portion of the first truncated cone-shaped portion and the reduced-diameter portion of the second truncated cone-shaped portion in a straight line parallel to the vertical center axis of the bottle.

[0011] The synthetic resin multi-squeeze bottle of the present invention includes a small-diameter barrel pressing portion that connects the first truncated cone portion and the second truncated cone portion in a straight line parallel to the vertical center axis of the bottle, so that when the small-diameter barrel pressing portion is pressed, the outer shell bottle is pressed along the entire length of the small-diameter barrel pressing portion, thereby significantly changing the amount of deformation of the outer shell bottle even with a smaller pressing force. Therefore, with the synthetic resin multi-squeeze bottle of the present invention, by pressing the small-diameter barrel pressing portion, which is easy to grip, the air in the middle layer can be more strongly compressed throughout the entire barrel pressing portion, so that the pressing force is easily transmitted to the inner container, and the contents can be easily discharged even when only a small amount remains in the inner container toward the end of use of the synthetic resin multi-squeeze bottle.

[0012] In the synthetic resin multiple squeeze bottle of the present invention, the angle θ between the small diameter barrel pressing portion and the first truncated cone portion or the second truncated cone portion is preferably in the range of 172 to 178°. By setting the angle θ in this range, the pressing force on the small diameter barrel pressing portion can be applied to the entire barrel pressing portion.

[0013] In this case, the angle θ formed between the barrel pressing small diameter portion and the first truncated cone portion or the second truncated cone portion may be the same angle or different angles within the above range.

[0014] Furthermore, in the synthetic resin multiple squeeze bottle of the present invention, when the total length of the body pressing portion is H and the length of the body pressing portion is L, it is preferable that the ratio (L / H) of the length L of the body pressing portion to the total length H of the body pressing portion is in the range of 0.15 to 0.60.

[0015] When the ratio (L / H) of the length L of the small-diameter barrel pressing portion to the total length H of the barrel pressing portion is less than 0.15, the area affected by the pressing force tends to be concentrated directly below the pressed portion, making it difficult to press the shell bottle over the entire length of the barrel pressing portion.On the other hand, when the ratio (L / H) of the length L of the small-diameter barrel pressing portion to the total length H of the barrel pressing portion is more than 0.60, the area affected by the pressing force becomes too wide, the pressing force is dispersed over a wide area, and the shell bottle may not be pressed sufficiently.

[0016] In the synthetic resin multi-squeeze bottle of the present invention, the outer shell bottle and the inner container may be made of, for example, a polyester resin, and the polyester resin may be, for example, a polyethylene terephthalate resin. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view showing an example of the configuration of a synthetic resin multi-squeeze bottle of the present invention. FIG. [Figure 2] Cross-sectional view of line II-II in Figure 1. [Figure 3] FIG. 1 is a longitudinal cross-sectional view showing an example of the configuration of a conventional multi-squeeze bottle made of synthetic resin. [Figure 4] FIG. 10 is a longitudinal cross-sectional view showing another example of the configuration of a conventional multi-squeeze bottle made of synthetic resin. [Figure 5] 1 and 2 , (b) a conventional synthetic resin multiple squeeze bottle shown in FIG. 3 , and (c) a conventional synthetic resin multiple squeeze bottle shown in FIG. 4 . [Figure 6] 1 and 2 , (b) a conventional synthetic resin multiple squeeze bottle shown in FIG. 3 , and (c) a conventional synthetic resin multiple squeeze bottle shown in FIG. 4 . [Figure 7] 1 and 2 , (b) a conventional synthetic resin multiple squeeze bottle shown in FIG. 3 , and (c) a conventional synthetic resin multiple squeeze bottle shown in FIG. 4 . [Figure 8] 1 is an explanatory diagram of the action of the body pressing part of the synthetic resin multi-squeeze bottle of the present invention. FIG. [Figure 9] 5 is a graph showing the change in discharge amount versus the number of times the body pressing portion of the conventional synthetic resin multi-squeeze bottle shown in FIG. 4 is repeatedly pressed with a constant pressing force. [Figure 10] 4 is a graph showing the change in pressing force with respect to the number of times of dispensing when a fixed amount of content is repeatedly dispensed in the synthetic resin multi-squeeze bottle of the present invention shown in FIGS. 1 and 2 and the conventional synthetic resin multi-squeeze bottle shown in FIG. [Figure 11]4 is a graph showing the change in volume of the outer shell bottle with respect to the pressing force for the synthetic resin multiple squeeze bottle of the present invention shown in FIGS. 1 and 2 and the conventional synthetic resin multiple squeeze bottle shown in FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0018] Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

[0019] 1 and 2, the synthetic resin multi-squeeze bottle 1 of this embodiment comprises an outer shell bottle 2 that is reversible to its original shape when subjected to a compressive force, and an inner container 3 that is housed inside the outer shell bottle 2 and undergoes compressive deformation via an intermediate layer of air compressed by the compressive force of the outer shell bottle 2. The outer shell bottle 2 and inner container 3 are made of a polyester resin such as polyethylene terephthalate resin.

[0020] Shell bottle 2 has a cylindrical outer opening 4, a shoulder 5 connected to outer opening 4, a body pressing portion 6 connected to shoulder 5, and a bottom 7 connected to body pressing portion 6. Bottom 7 has a recess 8 on its inner periphery that bulges inward from outer shell bottle 2 to provide synthetic resin multi-squeeze bottle 1 with self-supporting properties, and the area between bottom 7 and recess 8 forms a ground contact portion 9.

[0021] The outer opening 4 has a male thread 10 and a support ring 11 on its outer surface, and the part of the shoulder 5 that contacts the outer opening 4 is a truncated quadrangular pyramid portion 12, and below the truncated quadrangular pyramid portion 12 is an upper body portion 13 that gradually expands in diameter from the truncated quadrangular pyramid portion 12 towards the body pressing portion 6, with the corners of the pyramid becoming smooth and connecting to the body pressing portion 6.

[0022] Body pressing portion 6 has a circular cross section perpendicular to the vertical center axis X of synthetic resin multi-squeeze bottle 1, and is connected to shoulder portion 5 via first circumferential groove 6a, while being connected to bottom portion 7 via second circumferential groove 6b. In this case, the cylindrical outer opening portion 4 of outer shell bottle 2, the shoulder portion 5 connected to outer opening 4, and the bottom portion 7 are not subjected to a pressing force due to the action of first circumferential groove 6a and second circumferential groove 6b in response to the pressing (squeezing) action on body pressing portion 6, and are therefore hardly deformed.

[0023] The body pressing portion 6 further comprises a first truncated cone-shaped portion 6c whose diameter decreases linearly from the lower end of the circumferential groove portion 6a connected to the shoulder portion 5 toward the center of the body pressing portion 6, a second truncated cone-shaped portion 6d whose diameter decreases linearly from the upper end of the circumferential groove portion 6b connected to the bottom portion 7 toward the center of the body pressing portion 6, and a body pressing small-diameter portion 6e of a predetermined length that connects the reduced-diameter portion 6c1 of the first truncated cone-shaped portion 6c and the reduced-diameter portion 6d1 of the second truncated cone-shaped portion 6d by a straight line, and a plurality of vertical ribs 14 extending in the direction of the vertical central axis X of the synthetic resin multi-squeeze bottle 1 around the entire circumference of the area between the circumferential groove portion 6a and the circumferential groove portion 6b.

[0024] The small diameter body pressing portion 6e is linear (linear when viewed from the side) when the synthetic resin multi-squeeze bottle 1 is viewed from the side while the synthetic resin multi-squeeze bottle 1 is standing upright by the grounding portion 9, and is parallel to the vertical center axis X of the synthetic resin multi-squeeze bottle 1.

[0025] Here, the angle θ formed between the cylinder pressing small diameter portion 6e and the first truncated cone portion 6c or the second truncated cone portion 6d is preferably in the range of 172 to 178°, and more preferably in the range of 173 to 177°. By having the angle θ in this range, the pressing force on the cylinder pressing small diameter portion 6e can be applied to the entire cylinder pressing portion 6.

[0026] Furthermore, when the total length of the barrel pressing section 6 (the sum of the lengths of the first truncated cone portion 6c, the barrel pressing small diameter portion 6e, and the second truncated cone portion 6d) is H and the length of the barrel pressing small diameter portion 6e is L, the ratio (L / H) of the length L of the barrel pressing small diameter portion 6e to the total length H of the barrel pressing section 6 is preferably in the range of 0.15 to 0.60, and more preferably in the range of 0.20 to 0.55.

[0027] By setting the ratio (L / H) of the length L of the small diameter barrel pressing portion 6e to the total length H of the barrel pressing portion 6 within the above range, the shell bottle 2 can be pressed along the entire length of the barrel pressing portion 6, and the volume of the shell bottle 2 can be changed significantly with less pressing force.

[0028] Furthermore, in the synthetic resin multi-squeeze bottle 1 of this embodiment, when the maximum diameter of the upper body portion 13 is A and the diameter of the body-pressed small diameter portion 6e is B, it is preferable that the ratio (A / B) of the maximum diameter A of the upper body portion 13 to the diameter B of the body-pressed small diameter portion 6e is in the range of 1.05 to 1.10.

[0029] The bottom 7 has a truncated quadrangular pyramid portion 15 at the part that connects to the ground contact portion 9, and above the truncated quadrangular pyramid portion 15 is a lower body portion 16 that gradually expands in diameter from the truncated quadrangular pyramid portion 15 towards the body pressing portion 6, with the corners of the pyramid becoming smooth and connecting to the body pressing portion 6.

[0030] Each of the truncated quadrangular pyramidal portions 12 and 15 has a quadrangular cross section perpendicular to the vertical central axis X of the synthetic resin multi-squeeze bottle 1, with R at its vertices and ridge lines 12a and 15a at the vertices. Here, ridge line 15a is continuous with the extension of ridge line 12a.

[0031] On the other hand, the inner container 3 has a cylindrical inner opening 17 disposed on the inner periphery of the outer opening 4, and an inner container body 18 connected to the inner opening 17 and shaped to fit the inner shapes of the shoulder 5, body pressing portion 6, bottom 7, recess 8, and grounding portion 9 of the outer shell bottle 2. The inner opening 17 has an extension 19 at its top that extends above the upper end of the outer opening 4, and a flange 20 that projects radially outward from the extension 19, and is fastened to the upper edge of the outer opening 4 by the flange 20.

[0032] The inner opening 17 has a vertical groove 21 on its outer circumferential surface. The vertical groove 21 is connected to a horizontal groove 22 formed on the underside of the flange 20, and the horizontal groove 22 opens to the outside at the outer circumferential edge of the flange 20. As a result, the vertical groove 21 and the horizontal groove 22 form an air passage 23 that introduces outside air into the intermediate layer between the outer shell bottle 2 and the inner container 3.

[0033] The synthetic resin multi-squeeze bottle 1 can be produced, for example, by placing an inner preform made of polyethylene terephthalate resin that forms the inner container 3 inside an outer preform made of polyethylene terephthalate resin that forms the outer shell bottle 2, and then blow molding the resulting mixture. The blow molding can be carried out by a well-known method using a well-known blow molding device.

[0034] Next, with reference to FIGS. 3 and 4, the configurations of a conventional synthetic resin multiple squeeze bottle 1' and a synthetic resin multiple squeeze bottle 1" will be described as comparison objects with the synthetic resin multiple squeeze bottle 1 of this embodiment.

[0035] The synthetic resin multiple squeeze bottle 1' shown in Figure 3 is the synthetic resin multiple squeeze bottle described in JP 2019-018892 A, and has exactly the same configuration as the synthetic resin multiple squeeze bottle 1 of this embodiment, except that the body pressing portion 6' is hand-drum-shaped, tapering in diameter in an arc from the lower end of circumferential groove portion 6a toward the center and expanding in diameter in an arc from the center toward the upper end of circumferential groove portion 6b. Therefore, in Figure 3, the same components as those in the synthetic resin multiple squeeze bottle 1 of this embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

[0036] Furthermore, synthetic resin multiple squeeze bottle 1" shown in Figure 4 has exactly the same configuration as synthetic resin multiple squeeze bottle 1 of this embodiment, except that the entire body pressing portion 6" is cylindrical and has the same diameter from the lower end of circumferential groove portion 6a to the upper end of circumferential groove portion 6b. Therefore, in Figure 4, the same components as those in synthetic resin multiple squeeze bottle 1 of this embodiment are given the same reference numerals and detailed description thereof will be omitted.

[0037] Next, the difference in the range of influence of a predetermined pressing force applied to the body pressing portions 6, 6', 6" between the synthetic resin multi-squeeze bottle 1 of this embodiment shown in Figures 1 and 2 and the conventional synthetic resin multi-squeeze bottles 1', 1" shown in Figures 3 and 4 will be described.

[0038] First, as shown in FIG. 5, synthetic resin multi-squeeze bottles 1, 1', 1" are placed on a table (not shown) with their vertical central axes X horizontal. Here, (a) is the synthetic resin multi-squeeze bottle 1 of the present embodiment shown in FIGS. 1 and 2, (b) is the first conventional synthetic resin multi-squeeze bottle 1' shown in FIG. 3, and (c) is the second conventional synthetic resin multi-squeeze bottle 1" shown in FIG. 4. Only the body pressing parts 6, 6', 6" of each synthetic resin multi-squeeze bottle 1, 1', 1" are shown, and a pressing member 31 is arranged in the center of its length.

[0039] Next, FIG. 6 shows a state in which pressing member 31 has been displaced (pushed in) 10 mm inward (downward in the figure) of each of the synthetic resin multiple squeeze bottles 1, 1', 1" from the state shown in FIG. 5, and FIG. 7 shows a state in which pressing member 31 has been displaced 20 mm inward of each of the synthetic resin multiple squeeze bottles 1, 1', 1" from the state shown in FIG. 6 and 7, (a), (b), and (c) are the same as those in FIG. 5, and the shadow around pressing member 31 indicates the range affected by the pressing force of pressing member 31, with the darker the shadow, the greater the effect of the pressing force on the deformation amount of body pressing portion 6.

[0040] It is clear from Figures 5 to 7, particularly Figure 7, that in synthetic resin multi-squeeze bottle 1 of this embodiment, the range affected by the pressing force of pressing member 31 spreads in a rectangular shape over the entire length of body pressing portion 6. On the other hand, it is clear from Figures 5 to 7 that in conventional synthetic resin multi-squeeze bottles 1', 1" the range affected by the pressing force of pressing member 31 is concentrated in an inverted triangular shape directly below pressing member 31.

[0041] Next, with reference to FIG. 8, the function and effect of the body pressing portion 6 in the synthetic resin multi-squeeze bottle 1 of this embodiment will be described.

[0042] When viewed from the side of the synthetic resin multi-squeeze bottle 1 of this embodiment while standing upright with the base 9, as shown in FIG. 8, the body pressing portion 6, which is composed of the first truncated cone portion 6c, the small diameter body pressing portion 6e, and the second truncated cone portion 6d, has a shape in which the left bracket (open bracket) and the right bracket (closed bracket) of a tortoiseshell bracket are reversed 〔〕〔, and this shape is referred to as an "inverted tortoiseshell bracket shape" in this specification.

[0043] In the synthetic resin multi-squeeze bottle 1 of this embodiment, the body pressing portion 6 has the inverted tortoiseshell shape, and the small diameter body pressing portion 6e is linear in side view and parallel to the vertical center axis X of the synthetic resin multi-squeeze bottle 1. When a predetermined pressing force F is applied to the small diameter body pressing portion 6e, the pressing force on the outer shell bottle 2 acts on the entire body pressing portion 6 along the length of the small diameter body pressing portion 6e, via the connection portion 6c1, 6c2 (however, pressing force F is the total of pressing forces f).

[0044] In addition, in the synthetic resin multi-squeeze bottle 1 of this embodiment, the angle θ formed between the body-pressed small diameter portion 6e and the first truncated cone portion 6c or the second truncated cone portion 6d is preferably in the range of 172 to 178°, more preferably in the range of 173 to 177°.

[0045] In this case, the angle θ formed between the barrel pressing small diameter portion 6e and the first truncated cone portion 6c or the second truncated cone portion 6d may be the same angle or different angles within the above range.

[0046] As a result, in the synthetic resin multi-squeeze bottle 1 of this embodiment, as shown in Figures 5 to 7, the range affected by the pressing force (pressing force F in Figure 8) is not limited to the small diameter barrel pressing portion 6e, but is thought to extend in a rectangular shape over the entire barrel pressing portion 6.

[0047] Next, referring to Figure 9, the cylindrical body pressing portion 6" of a conventional synthetic resin multi-squeeze bottle 1" is repeatedly pressed with a constant pressing force (for example, 30 N pressing force each time) to eject the contents, and the change in the ejection amount versus the number of pressings is shown.

[0048] From Figure 9, it is clear that with the conventional synthetic resin multi-squeeze bottle 1", in the early stages of use when the number of squeezes is about 10 or less, 20.0 g or more of the content can be dispensed with a squeezing force of 30 N per squeeze, but towards the end of use when the number of squeezes is more than 30, the amount of content dispensed with a squeezing force of 30 N per squeeze drops to about 3 g or less, making it difficult to dispense the content.

[0049] Furthermore, as shown in Figures 5 to 7, conventional synthetic resin multiple squeeze bottle 1' behaves in the same way as synthetic resin multiple squeeze bottle 1" when pressure is applied to drum-shaped barrel pressing portion 6'. Therefore, conventional synthetic resin multiple squeeze bottle 1' behaves in the same way as synthetic resin multiple squeeze bottle 1" when drum-shaped barrel pressing portion 6' is repeatedly pressed with a constant pressure to dispense the contents, and it is thought that it becomes difficult to dispense the contents towards the end of use.

[0050] Next, we compared the change in pressing force relative to the number of times the contents were repeatedly dispensed, for example, 45 g each time, between synthetic resin multi-squeeze bottle 1 of this embodiment and a conventional synthetic resin multi-squeeze bottle 1'. The results are shown in Figure 10, with synthetic resin multi-squeeze bottle 1 of this embodiment as an example and conventional synthetic resin multi-squeeze bottle 1' as a comparison example.

[0051] 10, it is clear that in both synthetic resin multi-squeeze bottle 1 of this embodiment and conventional synthetic resin multi-squeeze bottle 1', the pressing force required to dispense 45 g of content increases as the number of dispenses increases. However, in synthetic resin multi-squeeze bottle 1 of this embodiment, the pressing force required to dispense 45 g of content is smaller than in conventional synthetic resin multi-squeeze bottle 1', and the difference in pressing force between the two bottles increases as the number of dispenses increases.

[0052] Next, the synthetic resin multi-squeeze bottle 1 of the present embodiment and a conventional synthetic resin multi-squeeze bottle 1' were compared in terms of the change in volume of the outer shell bottle 2 over time with respect to the pressing force. The results are shown in Fig. 11, with the synthetic resin multi-squeeze bottle 1 of the present embodiment as an example and the conventional synthetic resin multi-squeeze bottle 1' as a comparative example.

[0053] 11, there is almost no difference in the amount of volume change of outer shell bottle 2 between synthetic resin multiple squeeze bottle 1 of this embodiment and conventional synthetic resin multiple squeeze bottle 1' in the early stages of use when a sufficient amount of content can be dispensed with a small pressing force, with the amount of volume change of conventional synthetic resin multiple squeeze bottle 1' being only slightly greater. However, as the pressing force required toward the end of use increases beyond approximately 35 N, the relationship between the two is reversed, and it is clear that the amount of volume change of synthetic resin multiple squeeze bottle 1 of this embodiment becomes greater than the amount of volume change of conventional synthetic resin multiple squeeze bottle 1'.

[0054] From the above, it is clear that with the synthetic resin multi-squeeze bottle 1 of this embodiment, which has a body pressing portion 6 shaped like an inverted tortoiseshell bracket, even when the amount of content remaining in the inner container 3 is small towards the end of use, the volume change of the outer shell bottle 2 can be made large with a smaller pressing force than with the conventional synthetic resin multi-squeeze bottle 1', so the content can be easily dispensed. [Explanation of symbols]

[0055] 1...multiple squeeze bottle made of synthetic resin, 2...outer shell bottle, 3...inner container body, 4...outer opening portion, 5...shoulder portion, 6...body pressing portion, 6c...first truncated cone-shaped portion, 6d...second truncated cone-shaped portion, 6e...body pressing small diameter portion, 7...bottom portion, 9...ground portion, 17...inner opening portion, 18...inner container body, 23...ventilation channel.

Claims

1. a shell bottle having a cylindrical outer opening, a shoulder connected to the outer opening, a body pressing portion connected to the shoulder, a bottom connected to the body pressing portion, and a ground contact portion connected to the bottom, the shell bottle being able to return to its original shape when subjected to a pressing force; an inner container having a cylindrical inner opening disposed on the inner periphery of the cylindrical outer opening of the outer shell bottle, and an inner container body connected to the inner opening and shaped to fit the inner shape of the outer shell bottle, the inner container being deformed by a pressing force; A synthetic resin multi-squeeze bottle having an air passage formed between the outer opening and the inner opening for introducing outside air into an intermediate layer between the outer shell bottle and the inner container, a second truncated cone-shaped portion that tapers in diameter linearly from the portion connected to the bottom toward the center; and a small-diameter body-pressing portion that connects the first truncated cone-shaped portion and the second truncated cone-shaped portion in a straight line in a side view.

2. The synthetic resin multi-squeeze bottle according to claim 1, A synthetic resin multiple squeeze bottle, characterized in that the angle θ formed between the body pressing small diameter portion and the first truncated cone portion or the second truncated cone portion is an angle in the range of 172 to 178 degrees.

3. The synthetic resin multi-squeeze bottle according to claim 1, A synthetic resin multiple squeeze bottle, characterized in that when the overall length of the body pressing portion is H and the length of the body pressing small diameter portion is L, the ratio (L / H) of the length L of the body pressing small diameter portion to the overall length H of the body pressing portion is in the range of 0.15 to 0.

60.

4. The synthetic resin multi-squeeze bottle according to claim 1, 1. A synthetic resin multi-squeeze bottle, wherein the outer shell bottle and the inner container are made of polyester resin.

5. The synthetic resin multi-squeeze bottle according to claim 4, 1. A synthetic resin multi-squeeze bottle, wherein the polyester resin is polyethylene terephthalate resin.

Images