A double tube toothpaste capable of ensuring balanced extrusion of two kinds of paste

Abstract

The application discloses a double-tube toothpaste capable of guaranteeing balanced extrusion of two kinds of paste bodies, comprising a concentric double tube and paste bodies in the double tube; the concentric double tube comprises an inner tube and an outer tube; the inner tube comprises an inner tube body and an inner tube nozzle; the outer tube comprises an outer tube body and an outer tube nozzle; the paste body in the inner tube and the outer tube has a viscosity of 103-992 Pa·s; the paste body in the inner tube and the outer tube has a density of 1.10-1.61 g / cm 3 ; the pipe diameter ratio of the outer tube to the inner tube in the double-tube toothpaste is 1.2-1.6; and the stiffness of the outer tube and the inner tube in the double-tube toothpaste is 3N-15N. When the double-tube toothpaste is manually extruded, the two kinds of paste bodies extruded can be guaranteed to be balanced every time.

Description

Technical Field

[0001] This invention relates to the field of oral care technology, and in particular to a dual-tube toothpaste that ensures the even extrusion of two types of toothpaste. Background Technology

[0002] Toothpaste is a commonly used cleaning product in daily life with a long history. With the continuous development of toothpaste manufacturing science and technology, and the continuous improvement and perfection of process equipment, various types of toothpaste have emerged one after another. The quality and grade of the products have been continuously improved. Now, toothpaste varieties have evolved from single cleaning toothpastes to a wide range of multifunctional toothpastes with diverse functions, with hundreds of brands, meeting the needs of different consumer levels.

[0003] Most toothpaste products on the market are currently packaged in a single tube, meaning each tube can only hold one type of toothpaste. This limited variety of toothpaste types sometimes fails to provide the full range of benefits a product can offer. Therefore, dual-tube toothpaste, such as concentric tubes, has been developed. In these dual-tube designs, different toothpastes are stored in the inner and outer tubes. When used, squeezing the tubes causes the toothpaste from both tubes to be expelled simultaneously. While this method allows for simultaneous expulsion of both toothpastes, it often results in an uneven distribution of the two types of toothpaste. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a dual-tube toothpaste that ensures the even extrusion of both types of toothpaste. When manually squeezed, this dual-tube toothpaste ensures that the two types of toothpaste are extruded in equal amounts each time.

[0005] The terms "equalized extrusion" and "maintaining balance" have the same meaning. Those skilled in the art usually use data from the term "uniformity" to determine this. When the uniformity is ≥50%, it is usually considered to be "maintaining balance" or "equalized extrusion".

[0006] To solve the above-mentioned technical problems, the invention adopts the following technical solution. :

[0007] A dual-tube toothpaste that ensures the even extrusion of two types of toothpaste, comprising concentric dual tubes and toothpaste within the dual tubes;

[0008] The concentric double tubes include an inner tube and an outer tube;

[0009] The inner tube includes an inner tube body and an inner tube nozzle;

[0010] The outer tube includes an outer tube body and an outer tube nozzle;

[0011] The viscosity of the paste in the inner and outer tubes is 103-992 Pa·s;

[0012] The density of the paste inside the inner and outer tubes is 1.10-1.61 g / cm³. 3;

[0013] The diameter ratio of the outer tube to the inner tube in the dual-tube toothpaste is 1.2-1.6;

[0014] The stiffness of the outer and inner tubes in the dual-tube toothpaste is 3N-15N.

[0015] As one embodiment, the viscosity of the paste in the dual-tube toothpaste is 331-823 Pa·s.

[0016] As one embodiment, the viscosity difference between the paste in the outer tube and the inner tube is 0-500; preferably, the viscosity difference between the paste in the outer tube and the inner tube is 0-330 Pa·s.

[0017] As one embodiment, the density of the toothpaste in the dual-tube tube is 1.38-1.50 g / cm³. 3 .

[0018] As one embodiment, the density difference of the paste in the outer tube and the inner tube is -0.51 to 0.51 g / cm³. 3 Preferably, the density difference of the paste in the outer tube and the inner tube is 0-0.51 g / cm³. 3 More preferably, the density difference of the paste in the outer tube and the inner tube is 0-0.40 g / cm³. 3 .

[0019] In one embodiment, the diameter ratio of the outer tube to the inner tube in the dual-tube toothpaste is 1.2-1.4.

[0020] As one embodiment, the stiffness of the dual-tube toothpaste tube is 3-15N.

[0021] As one implementation, the inner and outer tubes of the concentric double tubes may have the same or different tube stiffness, preferably the inner tube has higher tube stiffness than the outer tube.

[0022] As one embodiment, the concentric double-tube material contains 0-65 wt% high-density polyethylene, preferably 5-60%.

[0023] As one embodiment, the difference in high-density polyethylene content between the outer tube and the inner tube is -60% to 60%, preferably -5% to 40%, and more preferably 0% to 40%.

[0024] Any range described in this invention includes the endpoint, any value between the endpoints, and any subrange consisting of the endpoint or any value between the endpoints.

[0025] Unless otherwise specified, all raw materials used in this invention can be obtained commercially, and the equipment used in this invention can be conventional equipment in the relevant field or refer to existing technology in the relevant field.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The dual-tube toothpaste of this invention ensures that the two types of paste dispensed are always balanced when squeezed manually. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the dual-tube toothpaste structure of the present invention.

[0029] Figure 2 This is a schematic diagram of one of the outlets of the outer tube nozzle and the inner tube nozzle of the dual-tube toothpaste of the present invention.

[0030] Figure 3 This is a schematic diagram of the outer tube nozzle and the inner tube nozzle outlet of the dual-tube toothpaste of the present invention. Detailed Implementation

[0031] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific descriptions below are illustrative rather than restrictive, and should not be construed as limiting the scope of protection of the present invention.

[0032] Unless otherwise stated, all percentages and ratios used herein are based on the total weight of the composition. Unless otherwise stated, all percentages, proportions, and contents of ingredients mentioned herein are based on the actual content of the ingredient and do not include solvents, fillers, or other substances that can be combined with these ingredients in commercially available products.

[0033] The term "includes / contains" in this article refers to other steps and components that may be added without affecting the final result.

[0034] The term "preferred" and its variations herein refer to embodiments of the invention that provide specific beneficial effects under particular conditions. However, other embodiments may also be preferred under the same or other conditions. Furthermore, the detailed description of one or more preferred embodiments does not imply that other embodiments are useless, nor is it intended to exclude other embodiments from the scope of the invention.

[0035] Unless otherwise specified in the embodiments of the present invention, the conditions shall be performed in accordance with conventional conditions or conditions recommended by the manufacturer; if the manufacturers of the reagents or instruments used are not specified, they are all conventional products that can be purchased commercially.

[0036] See Figures 1-3 As shown, as one aspect of the present invention, the present invention provides a dual-tube toothpaste that can ensure the balanced extrusion of two types of toothpaste, comprising concentric dual tubes and toothpaste within the dual tubes;

[0037] The concentric double tube includes an inner tube 10 and an outer tube 20;

[0038] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0039] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22;

[0040] The viscosity of the toothpaste in the dual-tube toothpaste is 103-992 Pa·s;

[0041] The density of the toothpaste in the dual-tube tube is 1.10-1.61 g / cm³. 3 ;

[0042] The diameter ratio of the outer tube to the inner tube in the dual-tube toothpaste is 1.2-1.6;

[0043] The stiffness of the outer and inner tubes in the dual-tube toothpaste is 3N-15N.

[0044] Concentric double tube

[0045] See Figures 1-3 As shown, the concentric double tube 100 used in this application includes an inner tube 10 and an outer tube 20;

[0046] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0047] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22;

[0048] The inner tube 10 and the outer tube 20 are filled with different phases of paste and sealed by clamping the tail. When in use, the tail of the sealed tube is squeezed to squeeze out the paste from the inner tube 10 and the outer tube 20 at the same time.

[0049] It should be noted that, see Figure 2 and Figure 3 As shown, at the openings of the outer tube nozzle 22 and the inner tube nozzle 12, the cross-sectional area through which the paste passes can be controlled by setting the number and size of uniform small holes 23 on the outer tube nozzle 22. The ratio of the cross-sectional areas determines the volume ratio of the paste in the inner tube and the paste in the outer tube when the paste is extruded.

[0050] In some embodiments of the present invention, the cross-sectional areas of the outer tube and the inner tube nozzle are 3:1-1:3, for example, but not limited to 2:1-1:3, 1:1-1:3, 3:1-1:2, 3:1-1:1.

[0051] In some embodiments of the present invention, the concentric double tube comprises high-density polyethylene, wherein the content of high-density polyethylene accounts for 0-65% of the tube, for example, but not limited to 0-60%, 0-40%, 0-20%, 0-5%, 5-65%, 5-60%, 5-40%, 5-20%, 20-65%, 20-60%, 20-40%, 40-65%, 40-60%.

[0052] In some embodiments of the present invention, the difference in high-density polyethylene content between the outer and inner concentric double-tube materials is -60-60%, for example, but not limited to -40-60%, -15-60%, -5-60%, 0-60%, 15-60%, 40-60%, -60-40%, -40-40%, -40-40%, -15-40%, -5-40%, 0-40%, 15-40%, -60-15%, -40-15%, -15-15%, 0-15%, -60-0%, -40-0%, -15-0%, -60--15%, -40--15%, -60--45%.

[0053] Pipe diameter ratio of concentric double tubes

[0054] The present invention unexpectedly discovered that the diameter ratio of the outer tube and the inner tube in a dual-tube toothpaste has an impact on whether the two types of toothpaste can be squeezed out evenly; the tube diameter ratio refers to the diameter ratio.

[0055] In some embodiments of the present invention, the diameter ratio of the outer tube to the inner tube is 1.2-1.6, for example, but not limited to 1.2-1.5, 1.2-1.4, 1.2-1.3, 1.3-1.6, 1.3-1.5, 1.3-1.4, 1.4-1.6, 1.4-1.5.

[0056] Stiffness of concentric circle double-pipe material

[0057] Stiffness is an important indicator of double-pipe materials. Stiffness refers to the pressing force required to press the composite pipe into a hollow tube or sleeve (without a cap or shoulder) to half its diameter.

[0058] In some embodiments of the invention, the stiffness of the inner tube of the concentric double-tube toothpaste is higher than that of the outer tube. The invention unexpectedly discovered that the stiffness of the inner and outer tubes affects whether the two types of toothpaste can be extruded evenly from the double-tube toothpaste.

[0059] In some embodiments of the present invention, the stiffness of the concentric double-tube material is 3-15N, for example, but not limited to 3-12N, 3-9N, 3-7N, 3-5N, 5-15N, 5-12N, 5-9N, 5-7N, 7-15N, 7-12N, 7-9N, 9-15N, 9-12N.

[0060] In some embodiments of the present invention, the outer and inner tubes of the concentric double tubes have the same stiffness.

[0061] In some embodiments of the present invention, the outer and inner tubes of the concentric double tubes have different stiffness.

[0062] In some embodiments of the present invention, the stiffness of the inner concentric double tube is higher than that of the outer tube.

[0063] Paste viscosity

[0064] The present invention unexpectedly discovered that the viscosity of the paste in the inner and outer tubes has a significant impact on whether the two pastes can be squeezed out of the dual-tube toothpaste evenly.

[0065] In some embodiments of the present invention, the viscosity of the paste in the dual-tube toothpaste is 103-992 Pa·s; more preferably 331-823 Pa·s.

[0066] In some embodiments of the present invention, the viscosity difference between the paste in the outer tube and the inner tube is 0-500; preferably, the viscosity difference between the paste in the outer tube and the inner tube is 0-330 Pa·s.

[0067] Paste density

[0068] The present invention unexpectedly discovered that the density of the paste in the inner and outer tubes has a significant impact on whether the two types of paste can be squeezed out evenly in the dual-tube toothpaste.

[0069] In some embodiments of the present invention, the density of the paste in the dual-tube toothpaste is 1.38-1.50 g / cm³. 3 .

[0070] In some embodiments of the present invention, the density difference of the paste in the outer tube and the inner tube is -0.51 to 0.51 g / cm³. 3 Preferably, the density difference of the paste in the outer tube and the inner tube is 0-0.51 g / cm³. 3 .

[0071] In some preferred embodiments of the present invention, the density difference of the paste in the outer tube and the inner tube is 0-0.40 g / cm³. 3 .

[0072] The method for evaluating the uniformity of extrusion of the two types of toothpaste in the dual-tube toothpaste of this invention

[0073] 1) Establishment of the evaluation team

[0074] Sixty qualified sensory evaluators were selected in accordance with GB / T 16291.1—1512 and GB / T12311-1512;

[0075] 2) Sample evaluation

[0076] Take one tube of toothpaste and squeeze both tubes 100 times to obtain 100 strips of toothpaste. Evaluators will assess the number of strips of toothpaste that are evenly distributed between the two tubes and calculate the uniformity rate. The average uniformity rate as determined by 60 evaluators will also be calculated. Specific Implementation

[0078] Examples 1-5, Comparative Examples 1-2

[0079] A dual-tube toothpaste 100 that ensures the even extrusion of two types of toothpaste, comprising concentric dual tubes and toothpaste contents within the dual tubes;

[0080] The concentric double tube includes an inner tube 10 and an outer tube 20;

[0081] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0082] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to that of the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle and the outlet cross-sectional area of ​​the inner tube nozzle are the same, when squeezing the dual-tube toothpaste, it is convenient to squeeze out an equal volume of paste from the outer tube and the inner tube.

[0083] Both the outer and inner tubes are made of high-density polyethylene with a content of 40%.

[0084] The ratio of the diameter of the outer tube to the diameter of the inner tube is 1.4;

[0085] The stiffness of both the inner and outer pipes is 7N;

[0086] The density of the paste in the inner and outer tubes is 1.1 g / cm³. 3 ;

[0087] Based on the different viscosities of the paste in the inner and outer tubes, different embodiments and comparative examples were obtained, as shown in Table 1 below:

[0088] Table 1:

[0089] Viscosity (Pa·s) 103 331 670 823 992 75 1087

[0090] The dual-tube toothpastes of the above embodiments and comparative examples were evaluated using the "Evaluation Method for the Uniformity of Extrusion of Two Types of Toothpaste in Dual-Tube Toothpaste" of the present invention, and the results are shown in Table 2 below:

[0091] Table 2:

[0092] Uniformity (%) 66.7 82.3 84.5 79.6 72 36.7 25.3

[0093] As shown in Table 2, under the same conditions, different paste viscosities have a significant impact on the extrusion uniformity of the dual-tube toothpaste of the present invention, as detailed below:

[0094] 1) When the paste viscosity is 75 Pa·s, the extrusion uniformity of the dual-tube toothpaste is only 36.7%;

[0095] 2) When the paste viscosity is 103 Pa·s, the extrusion uniformity of the dual-tube toothpaste is only 66.7%;

[0096] 3) When the paste viscosity is 331 Pa·s, the extrusion uniformity of the dual-tube toothpaste reaches 82.3%;

[0097] 4) When the paste viscosity is 670 Pa·s, the extrusion uniformity of the dual-tube toothpaste reaches 84.5%;

[0098] 5) When the paste viscosity is 823 Pa·s, the extrusion uniformity of the dual-tube toothpaste reaches 79.6%;

[0099] 6) When the paste viscosity is 992 Pa·s, the extrusion uniformity of the dual-tube toothpaste is 72.0%;

[0100] 7) When the paste viscosity is 1087 Pa·s, the extrusion uniformity of the dual-tube toothpaste is only 25.3%;

[0101] In summary, when the viscosity of the toothpaste in the dual-tube toothpaste is ≤75 Pa·s, the extrusion uniformity of the toothpaste decreases significantly (<37%); when the viscosity of the toothpaste in the dual-tube toothpaste is ≥1087 Pa·s, the extrusion uniformity also decreases significantly and drastically (<26%); when the viscosity of the toothpaste in the dual-tube toothpaste is between 103-992 Pa·s, the extrusion uniformity increases significantly (>66%); and especially when the viscosity of the toothpaste in the dual-tube toothpaste is between 331-823 Pa·s, the extrusion uniformity increases even more significantly (>79%).

[0102] Examples 6-8, Comparative Examples 3-4

[0103] A dual-tube toothpaste that ensures the even extrusion of two types of toothpaste, comprising concentric dual tubes and toothpaste within the dual tubes;

[0104] The concentric double tube includes an inner tube 10 and an outer tube 20;

[0105] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0106] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to that of the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle and the outlet cross-sectional area of ​​the inner tube nozzle are the same, when squeezing the dual-tube toothpaste, it is convenient to squeeze out an equal volume of paste from the outer tube and the inner tube.

[0107] The ratio of the diameter of the outer tube to the diameter of the inner tube is 1.4;

[0108] Both the outer and inner tubes are made of high-density polyethylene with a content of 40%.

[0109] The stiffness of both the inner and outer pipes is 7N;

[0110] The viscosity of the paste in the inner and outer tubes of the dual-tube toothpaste is 331 Pa·s.

[0111] Based on the different densities of the paste in the inner and outer tubes, different embodiments and comparative examples were obtained, as shown in Table 3 below. For ease of comparison, Example 2 is also included in Table 3:

[0112] Table 3:

[0113] <![CDATA[density (g / cm 3 )]]> 1.10 1.38 1.50 1.61 1.05 1.73

[0114] The dual-tube toothpastes of the above embodiments and comparative examples were evaluated using the "Evaluation Method for the Uniformity of Extrusion of Two Types of Toothpaste in Dual-Tube Toothpaste" of the present invention, and the results are shown in Table 4 below:

[0115] Table 4

[0116] Uniformity (%) 82.3 89.8 86.3 75.5 43.2 33.8

[0117] As shown in Table 4, under the same conditions, different paste viscosities have a significant impact on the extrusion uniformity of the dual-tube toothpaste of the present invention, as detailed below:

[0118] 1) When the density of the paste is 1.05 g / cm³ 3 At that time, the uniformity of extrusion of the dual-tube toothpaste was only 43.2%;

[0119] 2) When the density of the paste is 1.10 g / cm³ 3 At that time, the uniformity of extrusion of the dual-tube toothpaste reached 82.3%;

[0120] 3) When the density of the paste is 1.38 g / cm³ 3 At that time, the uniformity of extrusion of the dual-tube toothpaste reached 89.8%;

[0121] 4) When the density of the paste is 1.50 g / cm³ 3 At that time, the uniformity of extrusion of the dual-tube toothpaste reached 86.3%;

[0122] 5) When the density of the paste is 1.61 g / cm³ 3 At that time, the uniformity of extrusion of the dual-tube toothpaste reached 75.5%;

[0123] 6) When the density of the paste is 1.73 g / cm³ 3 At that time, the uniformity of extrusion for dual-tube toothpaste was only 33.8%;

[0124] In summary, when the density of the toothpaste in a dual-tube toothpaste tube is ≤1.05 g / cm³, 3 The uniformity of extrusion of dual-tube toothpaste will decrease significantly (<44%); when the paste density in dual-tube toothpaste is ≥1.73g / cm³, the uniformity of extrusion will decrease significantly. 3 When the uniformity of extrusion of the dual-tube toothpaste is high, a significant and sharp decrease occurs (<34%); when the paste density in the dual-tube toothpaste is between 1.10 and 1.61 g / cm³, the uniformity also decreases dramatically. 3 When the extrusion uniformity of the dual-tube toothpaste is significantly improved (>75%), especially when the paste density in the dual-tube toothpaste is between 1.38-1.50 g / cm³, the uniformity of extrusion will be significantly improved. 3 When the tube toothpaste is used, the uniformity of the extrusion rate will be significantly improved (>86%).

[0125] Examples 9-15

[0126] A dual-tube toothpaste that ensures the even extrusion of two types of toothpaste, comprising concentric dual tubes and toothpaste within the dual tubes;

[0127] The concentric double tube includes an inner tube 10 and an outer tube 20;

[0128] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0129] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to that of the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle and the outlet cross-sectional area of ​​the inner tube nozzle are the same, when squeezing the dual-tube toothpaste, it is convenient to squeeze out an equal volume of paste from the outer tube and the inner tube.

[0130] The ratio of the diameter of the outer tube to the diameter of the inner tube is 1.4;

[0131] The high-density polyethylene content in both the outer and inner tube materials is 40%.

[0132] The stiffness of both the inner and outer tubes is 7N;

[0133] The density of the toothpaste in the inner and outer tubes of the dual-tube toothpaste is 1.10 g / cm³. 3 .

[0134] Based on the different viscosity differences of the paste in the outer and inner tubes of the dual-tube toothpaste, Examples 9-15 were obtained, as shown in Table 5 below. For ease of comparison, Example 3 is also included in Table 5.

[0135] Table 5

[0136]

[0137] The dual-tube toothpaste of the above embodiment was evaluated using the "Evaluation Method for the Uniformity of Extrusion of Two Types of Toothpaste in Dual-Tube Toothpaste" of the present invention, and the results are shown in Table 6 below:

[0138] Table 6

[0139] Uniformity (%) 84.5 83.3 80.5 75.7 71.4 66.9 63.3

[0140] As shown in Table 6, under the same conditions, the viscosity difference between the outer and inner tubes of the toothpaste has a certain impact on the extrusion uniformity of the dual-tube toothpaste, as detailed below:

[0141] 1) When the viscosity difference between the outer tube and the inner tube is -492, the extrusion uniformity of the dual-tube toothpaste is 63.3%;

[0142] 2) When the viscosity difference between the outer tube and the inner tube is -329, the extrusion uniformity of the dual-tube toothpaste is 66.9%;

[0143] 3) When the viscosity difference between the outer tube and the inner tube is -153, the extrusion uniformity of the dual-tube toothpaste is 71.4%;

[0144] 4) When the viscosity difference between the outer tube and the inner tube is 0, the extrusion uniformity of the dual-tube toothpaste is 84.5%;

[0145] 5) When the viscosity difference between the outer tube and the inner tube is 153, the extrusion uniformity of the dual-tube toothpaste is 83.3%.

[0146] 6) When the viscosity difference between the outer tube and the inner tube is 329, the extrusion uniformity of the dual-tube toothpaste is 80.5%;

[0147] 7) When the viscosity difference between the outer tube and the inner tube is 492, the extrusion uniformity of the dual-tube toothpaste is 75.7%.

[0148] In summary, when the viscosity difference between the outer and inner tubes of a dual-tube toothpaste is >-500, the extrusion of the toothpaste will remain basically uniform (uniformity ≥50%). When the viscosity difference is ≤500, the extrusion uniformity will also remain uniform (uniformity ≥63%). In other words, when the viscosity difference between the outer and inner tubes is between -500 and 500, the extrusion will remain uniform (>50%). In particular, when the viscosity difference is between 0 and 330, the extrusion uniformity will be significantly improved (uniformity ≥80%).

[0149] Examples 16-21

[0150] A dual-tube toothpaste that ensures the even extrusion of two types of toothpaste, comprising concentric dual tubes and toothpaste within the dual tubes;

[0151] The concentric double tube includes an inner tube 10 and an outer tube 20;

[0152] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0153] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to that of the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle and the outlet cross-sectional area of ​​the inner tube nozzle are the same, when squeezing the dual-tube toothpaste, it is convenient to squeeze out an equal volume of paste from the outer tube and the inner tube.

[0154] The ratio of the diameter of the outer tube to the diameter of the inner tube is 1.4;

[0155] Both the outer and inner tubes are made of high-density polyethylene with a content of 40%.

[0156] The stiffness of both the inner and outer tubes is 7N;

[0157] The viscosity of the paste in the inner and outer tubes of the dual-tube toothpaste is 331 Pa·s.

[0158] Based on the density difference of the paste in the outer and inner tubes of the dual-tube toothpaste, Examples 16-21 were obtained, as shown in Table 7 below. For ease of comparison, Example 2 is also included in Table 7.

[0159] Table 7

[0160]

[0161] The dual-tube toothpaste of the above embodiment was evaluated using the "Evaluation Method for the Uniformity of Extrusion of Two Types of Toothpaste in Dual-Tube Toothpaste" of the present invention, and the results are shown in Table 8 below:

[0162] Table 8

[0163] Uniformity (%) 82.3 85 86.7 78.5 71.6 67.7 64.3

[0164] As shown in Table 8, under the same conditions, the density difference of the toothpaste in the outer and inner tubes has a certain impact on the extrusion uniformity of the toothpaste, as detailed below:

[0165] 1) When the density difference between the toothpaste in the outer tube and the inner tube is -0.51, the extrusion uniformity of the dual-tube toothpaste is 64.3%;

[0166] 2) When the density difference between the toothpaste in the outer tube and the inner tube is -0.40, the extrusion uniformity of the dual-tube toothpaste is 67.7%;

[0167] 3) When the density difference between the toothpaste in the outer tube and the inner tube is -0.28, the extrusion uniformity of the dual-tube toothpaste is 71.6%;

[0168] 4) When the density difference between the toothpaste in the outer tube and the inner tube is 0, the uniformity of the extrusion of the dual-tube toothpaste is 82.3%;

[0169] 5) When the density difference between the toothpaste in the outer tube and the inner tube is 0.28, the uniformity of toothpaste extrusion in the dual-tube tube is 85.0%;

[0170] 6) When the density difference between the toothpaste in the outer tube and the inner tube is 0.40, the extrusion uniformity of the dual-tube toothpaste is 86.7%;

[0171] 7) When the density difference between the toothpaste in the outer tube and the inner tube is 0.51, the extrusion uniformity of the dual-tube toothpaste is 78.5%.

[0172] In summary, when the density difference between the outer and inner tubes of a dual-tube toothpaste is ≤-0.28, the extrusion uniformity of the toothpaste decreases significantly; when the density difference is ≥0.51, the extrusion uniformity also decreases significantly. In other words, when the density difference is between 0 and 0.51, the extrusion uniformity increases significantly; especially when the density difference is between 0 and 0.40, the increase is even more pronounced. Overall, while a density difference between the outer and inner tubes of a dual-tube toothpaste in the range of -0.51 to 0.51 affects the extrusion uniformity, it does not lead to uneven extrusion (uniformity <50%).

[0173] Examples 22-23, Comparative Examples 5-6

[0174] A dual-tube toothpaste that ensures the even extrusion of two types of toothpaste, comprising concentric dual tubes and toothpaste within the dual tubes;

[0175] The concentric double tube includes an inner tube 10 and an outer tube 20;

[0176] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0177] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to that of the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle and the outlet cross-sectional area of ​​the inner tube nozzle are the same, when squeezing the dual-tube toothpaste, it is convenient to squeeze out an equal volume of paste from the outer tube and the inner tube.

[0178] The stiffness of both the inner and outer tubes is 7N;

[0179] Both the outer and inner tubes are made of high-density polyethylene with a content of 40%.

[0180] The density of the toothpaste in the inner and outer tubes of the dual-tube toothpaste is 1.1 g / cm³. 3 .

[0181] The viscosity of the paste in the inner and outer tubes of the dual-tube toothpaste is 331 Pa·s.

[0182] Based on the different diameter ratios of the outer and inner tubes of the dual-tube toothpaste, Examples 22-23 and Comparative Examples 5-6 were obtained, as shown in Table 9 below. For ease of comparison, Example 2 is also included in Table 9:

[0183] Table 9

[0184] Outer pipe diameter / Inner pipe diameter 1.4 1.2 1.6 1.1 1.7

[0185] The dual-tube toothpaste of the above embodiment was evaluated using the "Evaluation Method for the Uniformity of Extrusion of Two Types of Toothpaste in Dual-Tube Toothpaste" of the present invention, and the results are shown in Table 10 below:

[0186] Table 10

[0187] Uniformity (%) 82.3 86.3 76.5 42.0 40.3

[0188] As shown in Table 10, under the same conditions, different diameter ratios of the outer and inner tubes of the dual-tube toothpaste have a significant impact on the extrusion uniformity of the toothpaste, as detailed below:

[0189] 1) When the diameter ratio of the outer tube to the inner tube is 1.1, the extrusion uniformity of the dual-tube toothpaste is 42.0%;

[0190] 2) When the diameter ratio of the outer tube to the inner tube is 1.2, the extrusion uniformity of the dual-tube toothpaste is 86.3%;

[0191] 3) When the diameter ratio of the outer tube to the inner tube is 1.4, the extrusion uniformity of the dual-tube toothpaste is 82.3%;

[0192] 4) When the diameter ratio of the outer tube to the inner tube is 1.6, the extrusion uniformity of the dual-tube toothpaste is 76.5%.

[0193] 5) When the ratio of the outer tube diameter to the inner tube diameter is 1.7, the extrusion uniformity of the dual-tube toothpaste is 40.3%.

[0194] In summary, when the diameter ratio of the outer and inner tubes in a dual-tube toothpaste is ≤1.1, the extrusion uniformity of the toothpaste decreases significantly; when the ratio is ≥1.7, the extrusion uniformity also decreases significantly (uniformity ≤40.3%). In other words, when the diameter ratio is 1.2-1.6, the extrusion uniformity increases significantly (uniformity ≥76.5%); and especially when the ratio is 1.2-1.4, the extrusion uniformity increases even more significantly (uniformity ≥82.3%).

[0195] Examples 24-25, Comparative Examples 7-8

[0196] A dual-tube toothpaste that ensures the even extrusion of two types of toothpaste, comprising concentric dual tubes and toothpaste within the dual tubes;

[0197] The concentric double tube includes an inner tube 10 and an outer tube 20;

[0198] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0199] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to that of the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle and the outlet cross-sectional area of ​​the inner tube nozzle are the same, when squeezing the dual-tube toothpaste, it is convenient to squeeze out an equal volume of paste from the outer tube and the inner tube.

[0200] The diameter ratio of the outer tube to the inner tube is 1.4;

[0201] Both the outer and inner tubes are made of high-density polyethylene with a content of 40%.

[0202] The density of the toothpaste in the inner and outer tubes of the dual-tube toothpaste is 1.1 g / cm³. 3 .

[0203] The viscosity of the paste in the inner and outer tubes of the dual-tube toothpaste is 331 Pa·s.

[0204] Based on the different stiffness of the outer and inner tubes of the dual-tube toothpaste, Examples 24-25 and Comparative Examples 7-8 were obtained, as shown in Table 11 below. For ease of comparison, Example 2 is also included in Table 11 below:

[0205] Table 11

[0206] Outer tube stiffness (N) 7 3 15 2 17 Inner tube stiffness (N) 7 3 15 2 17

[0207] The dual-tube toothpaste of the above embodiment was evaluated using the "Evaluation Method for the Uniformity of Extrusion of Two Types of Toothpaste in Dual-Tube Toothpaste" of the present invention, and the results are shown in Table 12 below:

[0208] Table 12

[0209] Uniformity (%) 82.3 73.4 71.8 31.5 42.7

[0210] As shown in Table 12, under the same conditions, the difference in stiffness between the outer and inner tubes of the dual-tube toothpaste has a significant impact on the extrusion uniformity of the toothpaste, as detailed below:

[0211] 1) When the stiffness of both the outer and inner tubes is 2N, the extrusion uniformity of the dual-tube toothpaste is 31.5%;

[0212] 2) When the stiffness of both the outer and inner tubes is 3N, the extrusion uniformity of the dual-tube toothpaste is 73.4%.

[0213] 3) When the stiffness of both the outer and inner tubes is 7N, the extrusion uniformity of the dual-tube toothpaste is 82.3%;

[0214] 4) When the stiffness of both the outer and inner tubes is 15N, the extrusion uniformity of the dual-tube toothpaste is 71.8%.

[0215] 5) When the stiffness of both the outer and inner tubes is 17N, the extrusion uniformity of the dual-tube toothpaste is 42.7%.

[0216] In summary, when the stiffness of the outer and inner tubes of a dual-tube toothpaste is ≤2N, the extrusion uniformity of the toothpaste decreases significantly; when the stiffness of the outer and inner tubes is ≥17N, the extrusion uniformity also decreases significantly. In other words, when the stiffness of the outer and inner tubes is between 3N and 15N, the extrusion uniformity of the toothpaste increases significantly; especially when the stiffness of the outer and inner tubes is 7N, the extrusion uniformity increases even more significantly.

[0217] Examples 26-28

[0218] A dual-tube toothpaste that ensures the even extrusion of two types of toothpaste, comprising concentric dual tubes and toothpaste within the dual tubes;

[0219] The concentric double tube includes an inner tube 10 and an outer tube 20;

[0220] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0221] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to that of the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle and the outlet cross-sectional area of ​​the inner tube nozzle are the same, when squeezing the dual-tube toothpaste, it is convenient to squeeze out an equal volume of paste from the outer tube and the inner tube.

[0222] The diameter ratio of the outer tube to the inner tube is 1.4;

[0223] Both the outer and inner tubes are made of high-density polyethylene with a content of 40%.

[0224] The density of the toothpaste in the inner and outer tubes of the dual-tube toothpaste is 1.1 g / cm³. 3 .

[0225] The viscosity of the paste in the inner and outer tubes of the dual-tube toothpaste is 331 Pa·s.

[0226] Based on the fact that the outer tubes of the two-tube toothpaste have the same stiffness and the inner tubes have different stiffness, Examples 26-28 were obtained, as shown in Table 13 below. For ease of comparison, Example 2 is also included in Table 13:

[0227] Table 13

[0228] Outer tube stiffness (N) 7 7 7 7 Inner tube stiffness (N) 7 3 12 15

[0229] The dual-tube toothpaste of the above embodiment was evaluated using the "Evaluation Method for the Uniformity of Extrusion of Two Types of Toothpaste in Dual-Tube Toothpaste" of the present invention, and the results are shown in Table 14 below:

[0230] Table 14

[0231] Uniformity (%) 82.3 67.3 79.8 84.9

[0232] As shown in Table 14, under the same conditions and with the same outer tube stiffness, the difference in the inner tube stiffness of the dual-tube toothpaste of the present invention has an impact on the extrusion uniformity of the dual-tube toothpaste, but the impact is not significant, as detailed below:

[0233] 1) When the stiffness of the outer tube is 7N and the stiffness of the inner tube is 3N, the extrusion uniformity of the dual-tube toothpaste is 67.3%;

[0234] 2) When the stiffness of the outer tube is 7N and the stiffness of the inner tube is 7N, the extrusion uniformity of the dual-tube toothpaste is 82.3%;

[0235] 3) When the stiffness of the outer tube is 7N and the stiffness of the inner tube is 12N, the extrusion uniformity of the dual-tube toothpaste is 79.8%.

[0236] 4) When the stiffness of the outer tube is 7N and the stiffness of the inner tube is 15N, the extrusion uniformity of the dual-tube toothpaste is 84.9%.

[0237] In summary, when the outer tube stiffness of a dual-tube toothpaste is the same at 7N, the variation in inner tube stiffness between 3-15N will affect the extrusion uniformity, but it will not lead to uneven extrusion (uniformity <50%).

[0238] Examples 29-31

[0239] A dual-tube toothpaste that ensures the even extrusion of two types of toothpaste, comprising concentric dual tubes and toothpaste within the dual tubes;

[0240] The concentric double tube includes an inner tube 10 and an outer tube 20;

[0241] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0242] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to that of the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle and the outlet cross-sectional area of ​​the inner tube nozzle are the same, when squeezing the dual-tube toothpaste, it is convenient to squeeze out an equal volume of paste from the outer tube and the inner tube.

[0243] The diameter ratio of the outer tube to the inner tube is 1.4;

[0244] Both the outer and inner tubes are made of high-density polyethylene with a content of 40%.

[0245] The density of the toothpaste in the inner and outer tubes of the dual-tube toothpaste is 1.1 g / cm³. 3 .

[0246] The viscosity of the paste in the inner and outer tubes of the dual-tube toothpaste is 331 Pa·s.

[0247] Based on the different stiffness of the outer tube and the same stiffness of the inner tube in the dual-tube toothpaste, Examples 29-31 were obtained, as shown in Table 15 below. For ease of comparison, Example 2 is also included in Table 15:

[0248] Table 15

[0249] Outer tube stiffness (N) 7 3 9 15 Inner tube stiffness (N) 7 7 7 7

[0250] The dual-tube toothpaste of the above embodiment was evaluated using the "Evaluation Method for the Uniformity of Extrusion of Two Types of Toothpaste in Dual-Tube Toothpaste" of the present invention, and the results are shown in Table 16 below:

[0251] Table 16

[0252] Uniformity (%) 82.3 84.6 68.5 65.1

[0253] As shown in Table 16, under the same conditions and with the same inner tube stiffness, the difference in the outer tube stiffness of the dual-tube toothpaste of the present invention has an impact on the extrusion uniformity of the dual-tube toothpaste, but the impact is not significant, as detailed below:

[0254] 1) When the stiffness of the outer tube is 3N and the stiffness of the inner tube is 7N, the extrusion uniformity of the dual-tube toothpaste is 84.5%.

[0255] 2) When the stiffness of the outer tube is 7N and the stiffness of the inner tube is 7N, the extrusion uniformity of the dual-tube toothpaste is 82.3%;

[0256] 3) When the stiffness of the outer tube is 9N and the stiffness of the inner tube is 7N, the extrusion uniformity of the dual-tube toothpaste is 68.5%.

[0257] 4) When the stiffness of the outer tube is 15N and the stiffness of the inner tube is 7N, the extrusion uniformity of the dual-tube toothpaste is 65.1%.

[0258] In other words, when the inner tube stiffness of the dual-tube toothpaste is the same at 7N, the variation in the outer tube stiffness between 3-15N will affect the extrusion uniformity, but will not lead to uneven extrusion (uniformity <50%).

[0259] In summary, when the stiffness of the inner and outer tubes of the concentric double tubes is different, the uniformity of the paste extrusion between the inner and outer tubes is also relatively high. In particular, when the stiffness of the inner tube is higher than that of the outer tube, the uniformity is further increased.

[0260] Examples 32-36

[0261] The outer tube of ointment and the inner tube of ointment were respectively packaged into the outer tube and inner tube of different concentric double tubes, resulting in Examples 32-36, wherein the concentric double tubes have the following characteristics:

[0262] Includes concentric double tubes and cream inside the double tubes;

[0263] The concentric double tube includes an inner tube 10 and an outer tube 20;

[0264] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0265] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22; the ratio of the outlet cross-sectional area of ​​the outer tube nozzle to that of the inner tube nozzle is 1:1; since the outlet cross-sectional area of ​​the outer tube nozzle and the outlet cross-sectional area of ​​the inner tube nozzle are the same, when squeezing the dual-tube toothpaste, it is convenient to squeeze out an equal volume of paste from the outer tube and the inner tube.

[0266] The ratio of the diameter of the outer tube to the diameter of the inner tube is 1.4;

[0267] The stiffness of both the inner and outer pipes is 7N;

[0268] The viscosity of the paste in the inner and outer tubes of the dual-tube toothpaste is 331 Pa·s.

[0269] The difference between the concentric double tubes in different embodiments or comparative examples lies in the different high-density polyethylene content in the tube body. For ease of comparison, the high-density polyethylene content of the concentric tube material in Example 2 is listed in Table 17 below.

[0270] Table 17:

[0271]

[0272] The uniformity of toothpaste distribution during extrusion of the inner and outer tubes of the above-described embodiments and comparative examples was evaluated according to the method of the present invention, and the results are shown in Table 18 below.

[0273] Table 18:

[0274] Uniformity (%) 72.9 77.2 82.3 85.6 63.8 65.5

[0275] As can be seen from Table 18:

[0276] The uniformity of the toothpaste extruded from the inner and outer tubes of the concentric double-tube toothpaste in Example 32 was 72.9%.

[0277] The uniformity of the toothpaste extruded from the inner and outer tubes of the concentric double-tube toothpaste in Example 33 was 77.2%.

[0278] The uniformity of the toothpaste extruded from the inner and outer tubes of the concentric double-tube toothpaste in Example 2 was 82.3%.

[0279] The uniformity of the toothpaste extruded from the inner and outer tubes of the concentric double-tube toothpaste in Example 34 was 85.6%.

[0280] The uniformity of the toothpaste extruded from the inner and outer tubes of the concentric double-tube toothpaste in Example 35 was 63.8%.

[0281] The uniformity of the toothpaste extruded from the inner and outer tubes of the concentric double-tube toothpaste in Example 36 was 65.5%.

[0282] As shown above, the content of high-density polyethylene in concentric double-tube tubing affects the uniformity of paste extrusion.

[0283] 1) When the content of high-density polyethylene in the concentric double tube is 5%, the uniformity of the toothpaste extrusion from the inner and outer tubes of the concentric double tube toothpaste is 72.9%.

[0284] 1) When the content of high-density polyethylene in the concentric double tube is 20%, the uniformity of the toothpaste extrusion between the inner and outer tubes of the concentric double tube toothpaste is 77.2%.

[0285] 2) When the content of high-density polyethylene in the concentric double tube is 40%, the uniformity of the toothpaste extrusion from the inner and outer tubes of the concentric double tube toothpaste is 82.3%.

[0286] 3) When the content of high-density polyethylene in the concentric double tube is 60%, the uniformity of the toothpaste extrusion from the inner and outer tubes of the concentric double tube toothpaste is 85.6%.

[0287] 4) When the content of high-density polyethylene in the concentric double tube is 65%, the uniformity of the toothpaste extrusion between the inner and outer tubes of the concentric double tube toothpaste decreases to 63.8%.

[0288] 5) When the content of high-density polyethylene in the concentric double tube is 0%, the uniformity of the toothpaste extrusion from the inner and outer tubes of the concentric double tube toothpaste decreases to 65.5%.

[0289] In summary, when the content of high-density polyethylene in concentric double-tube pipes is between 0-65%, the uniformity of the extrusion of the paste in the inner and outer tubes is relatively high, especially when the content of high-density polyethylene is between 5-60%, the uniformity is even higher.

[0290] Examples 37-42

[0291] Examples 37-42 involve separately filling the outer tube and inner tube of the ointment into different concentric double tubes, wherein the concentric double tubes have the following characteristics:

[0292] The inner tube 10 includes an inner tube body 11 and an inner tube nozzle 12;

[0293] The outer tube 20 includes an outer tube body 21 and an outer tube nozzle 22;

[0294] The ratio of the outlet cross-sectional area of ​​the outer tube nozzle and the inner tube nozzle is 1:1. Since the outlet cross-sectional area of ​​the outer tube nozzle and the outlet cross-sectional area of ​​the inner tube nozzle are the same, when squeezing the dual-tube toothpaste, it is easy to squeeze out an equal volume of paste from the outer tube and the inner tube.

[0295] The ratio of the diameter of the outer tube to the diameter of the inner tube is 1.4;

[0296] The stiffness of both the inner and outer pipes is 7N.

[0297] The difference between the different concentric double tubes lies in the difference in the content of high-density polyethylene in the inner and outer tubes of the concentric double tube. For easy comparison, the difference in the content of high-density polyethylene in the concentric double tube material of Example 34 is listed in Table 19.

[0298] Table 19:

[0299]

[0300] The uniformity of toothpaste distribution during extrusion of the inner and outer tubes of the above-described embodiments and comparative examples was evaluated according to the method of the present invention, and the results are shown in Table 20 below.

[0301] Table 20:

[0302] Uniformity (%) 79.2 89.3 86.8 85.6 76.4 64.8 60.9

[0303] As can be seen from Table 20:

[0304] The uniformity of the toothpaste extruded from the inner and outer tubes of the concentric double-tube toothpaste in Example 37 was 79.2%.

[0305] The uniformity of the toothpaste extruded from the inner and outer tubes of the concentric double-tube toothpaste in Example 38 was 89.3%.

[0306] The uniformity of the toothpaste extruded from the inner and outer tubes of the concentric double-tube toothpaste in Example 39 was 86.8%.

[0307] The uniformity of the toothpaste extruded from the inner and outer tubes of the concentric double-tube toothpaste in Example 34 was 85.6%.

[0308] The uniformity of the toothpaste extruded from the inner and outer tubes of the concentric double-tube toothpaste in Example 40 was 76.4%.

[0309] The uniformity of the toothpaste extruded from the inner and outer tubes of the concentric double-tube toothpaste in Example 41 was 64.8%.

[0310] The uniformity of the toothpaste extruded from the inner and outer tubes of the concentric double-tube toothpaste in Example 42 was 60.9%.

[0311] As can be seen from the above, the difference in the content of high-density polyethylene in the inner and outer concentric double-tube tubing will affect the uniformity of the paste extrusion.

[0312] 1) When the difference in high-density polyethylene content between the inner and outer tubes of the concentric double-tube toothpaste is 60%, the uniformity of the toothpaste extrusion between the inner and outer tubes is 79.2%.

[0313] 2) When the difference in the content of high-density polyethylene in the inner and outer tubes of the concentric double tube toothpaste is 40%, the uniformity of the toothpaste extrusion between the inner and outer tubes is 89.3%, which is a significant improvement compared to when the content difference is 60%.

[0314] 3) When the difference in high-density polyethylene content between the inner and outer tubes of the concentric double-tube toothpaste is 15%, the uniformity of the toothpaste extrusion between the inner and outer tubes is 86.8%.

[0315] 4) When the difference in high-density polyethylene content between the inner and outer tubes of the concentric double-tube toothpaste is 0%, the uniformity of toothpaste extrusion between the inner and outer tubes is 85.6%.

[0316] 5) When the difference in high-density polyethylene content between the inner and outer tubes of the concentric double-tube toothpaste is -5%, the uniformity of the toothpaste extrusion between the inner and outer tubes is 76.4%.

[0317] 6) When the difference in high-density polyethylene content between the inner and outer tubes of the concentric double-tube toothpaste is -15%, the uniformity of the toothpaste extrusion between the inner and outer tubes is still as high as 64.8%. When the difference in content is -5%, the uniformity decreases.

[0318] 7) When the difference in the content of high-density polyethylene in the inner and outer tubes of the concentric double tube is -60%, the uniformity of the toothpaste extrusion between the inner and outer tubes is 60.9%, which is basically the same as when the content difference is -15%.

[0319] In summary, when the content difference of high-density polyethylene in the concentric double-tube outer and inner tubes is between -60% and 60%, the uniformity of the paste extrusion in both tubes is relatively high. However, when the content difference is between -5% and 40%, the uniformity is even higher, especially when the content difference is between 0% and 40%, the uniformity increases further.

[0320] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments described in this specification. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0321] Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples, without contradiction. The above descriptions are merely embodiments of the embodiments described in this specification and are not intended to limit the embodiments of this specification. Various modifications and variations can be made to the embodiments described in this specification by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the embodiments described in this specification should be included within the scope of the claims of the embodiments described in this specification.

Claims

1. A dual-tube toothpaste that ensures even extrusion of two different toothpaste products, characterized in that: Includes concentric double tubes and cream inside the double tubes; The concentric double tubes include an inner tube and an outer tube; The inner tube includes an inner tube body and an inner tube nozzle; The outer tube includes an outer tube body and an outer tube nozzle; The viscosity of the paste in the inner and outer tubes is 103-992 Pa·s; The density of the paste inside the inner and outer tubes is 1.10-1.61 g / cm³; The diameter ratio of the outer tube to the inner tube in the dual-tube toothpaste is 1.2-1.6; The stiffness of the outer and inner tubes in the dual-tube toothpaste is 3N-15N; The stiffness refers to the pressure required to press the composite pipe into a hollow tube and then press it to half its diameter.

2. The dual-tube toothpaste according to claim 1, characterized in that: The viscosity of the toothpaste in the dual-tube tube is 331-823 Pa·s.

3. The dual-tube toothpaste according to claim 1, characterized in that: The viscosity difference between the paste in the outer tube and the inner tube is 0-500 Pa·s.

4. The dual-tube toothpaste according to claim 1, characterized in that: The viscosity difference between the paste in the outer tube and the inner tube is 0-330 Pa·s.

5. The dual-tube toothpaste according to claim 1, characterized in that: The density of the paste inside the dual tubes is 1.38-1.50 g / cm³.

6. The dual-tube toothpaste according to claim 1, characterized in that: The density difference of the paste in the outer tube and the inner tube is -0.51 to 0.51 g / cm³.

7. The dual-tube toothpaste according to claim 6, characterized in that: The density difference of the paste in the outer tube and the inner tube is 0-0.51 g / cm³.

8. The dual-tube toothpaste according to claim 7, characterized in that: The density difference of the paste in the outer tube and the inner tube is 0-0.40 g / cm³.

9. The dual-tube toothpaste according to claim 1, characterized in that: The diameter ratio of the outer tube to the inner tube in the dual-tube toothpaste is 1.2-1.

4.

10. The dual-tube toothpaste according to claim 1, characterized in that: The inner and outer tubes of the concentric double tubes may have the same or different stiffness.

11. The dual-tube toothpaste according to claim 10, characterized in that: The inner tube of the concentric double tube has a higher stiffness than the outer tube.

12. The dual-tube toothpaste according to claim 1, characterized in that: The concentric double-tube material contains 0-65 wt% high-density polyethylene.

13. The dual-tube toothpaste according to claim 1, characterized in that: The concentric double-tube material contains 5-60% high-density polyethylene.

14. The dual-tube toothpaste according to claim 1, characterized in that: The difference in high-density polyethylene content between the outer and inner pipes is -60% to 60%.

15. The dual-tube toothpaste according to claim 14, characterized in that: The difference in high-density polyethylene content between the outer and inner pipes is -5% to 40%.

16. The dual-tube toothpaste according to claim 15, characterized in that: The difference in high-density polyethylene content between the outer and inner pipes is 0-40%.

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