Stick product manufacturing method

Abstract

To establish a manufacturing method that can suppress the occurrence of air pockets by efficient and inexpensive means, in the production of a stick product in which a cosmetic composition is directly filled into a container equipped with a delivery mechanism.SOLUTION: There is provided a manufacturing method of a stick product comprising a container equipped with a mechanism for dispensing the content by rotating a part of the shape and a cosmetic composition, the method comprising: a filling step (1) of directly filling the cosmetic composition into the container; a degassing step (2) of degassing air bubbles inside the stick by using a heated metal wire while standing to cool the filled cosmetic composition; and a solidification step (3) of solidifying the degassed cosmetic composition by standing to cool or cooling to mold it into a stick shape.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a method for producing a stick product. [Background technology]

[0002] Stick products in which a cosmetic composition is filled in a container equipped with a dispensing mechanism are widely used as various cosmetics such as lipstick, lip gloss, solid foundation, solid deodorant, etc. A typical method for producing these stick products is to use a metal mold to mold the cosmetic composition into a stick shape, and then to fit the stick into a container equipped with a dispensing mechanism.

[0003] This method of inserting the composition into a mold after molding has the disadvantage of being inefficient because the molding and inserting steps must be separate processes. Another issue is that manufacturing costs are high because of the additional costs incurred for mold creation. For this reason, a method of manufacturing stick products by directly filling a cosmetic composition into a container equipped with a dispensing mechanism has also been adopted (see, for example, Patent Document 1).

[0004] However, in the direct filling manufacturing method, when the filled cosmetic composition is allowed to cool or is cooled in the process of solidifying and molding it into a stick, problems arise, such as the formation of "air pockets" in which air bubbles within the cosmetic composition do not completely escape and gather inside the stick, trapping the air, or the formation of "distortion" on the outer surface of the stick after solidification. In particular, the presence or absence of air pockets that form inside the stick cannot be visually confirmed by appearance, which could lead to poor quality or product problems. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-069945 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in view of the above-mentioned conventional techniques, and aims to establish a production method that can efficiently and inexpensively suppress the occurrence of air entrapment in the production of stick products in which a cosmetic composition is directly filled into a container equipped with a feeding mechanism. [Means for solving the problem]

[0007] That is, the present invention is a method for producing a stick product comprising a container equipped with a mechanism for dispensing the contents by rotating part of the container, and a cosmetic composition, characterized in that the method comprises a filling step (1) in which the cosmetic composition is directly filled into the container, a degassing step (2) in which air bubbles inside the stick are degassed using a heated metal wire while the filled cosmetic composition is allowed to cool, and a solidification step (3) in which the degassed cosmetic composition is allowed to cool or cooled to solidify and mold into a stick shape.

[0008] In the above-mentioned filling step (1), it is desirable to melt and fill the cosmetic composition through a filling port provided at the bottom of the container.

[0009] In the above degassing step (2), it is desirable to insert a metal wire into the inside of the stick through the filling opening. [Effects of the Invention]

[0010] The stick product manufacturing method of the present invention addresses the problem of air entrapment that occurs when a cosmetic composition is directly filled into a container equipped with a dispensing mechanism. By incorporating the above steps (1) to (3), the method can efficiently and inexpensively suppress the occurrence of air entrapment, thereby enabling the production of high-quality stick products. DETAILED DESCRIPTION OF THE INVENTION

[0011] The method for producing the stick product of the present invention will be described in detail below.

[0012] [Containers with a feeding mechanism] The container used in the present invention is a container for directly filling various types of cosmetics such as stick-shaped makeup cosmetics such as lipstick, lip gloss, foundation, makeup base, and concealer; sunscreen, deodorant, etc., and is equipped with a mechanism for advancing or retracting the contents by rotating a part of the container shape.

[0013] The molding of the container is not particularly limited, and it may be a one-piece molded product or a molded product assembled from multiple parts, and it is desirable to select the container shape appropriately depending on the use of the cosmetic. In addition, the material of the container is not particularly limited, and it is desirable to use a resin or the like.

[0014] Specific examples of resins include polyethylene (PE resin), polypropylene (PP resin), polyvinyl chloride (PVC resin), polystyrene (PS resin), acrylonitrile butadiene styrene (ABS resin), acrylonitrile styrene (AS resin), polymethyl methacrylate (PMMA resin), polyvinyl alcohol (PVA resin), polyvinylidene chloride (PVDC resin), polybutylene terephthalate (PBT resin), polyethylene terephthalate resin (PET resin), and polyethylene sulfide (PPS resin).

[0015] In the present invention, the internal shape of the container in which the cosmetic composition described below is held is not particularly limited as long as it is a shape that allows the cosmetic composition to be advanced and retracted in stick form, but it is desirable for the container to have a shape such as a polygonal prism, such as a triangular prism or a square prism; a cylindrical prism, or an elliptical prism.

[0016] Furthermore, the container used in the present invention is preferably provided with a filling port through which the cosmetic composition can be directly filled. The location of the filling port is not particularly limited, but it is desirable that the filling port be provided at the bottom of the container so that the cosmetic composition can be directly filled into the container in its final form and a stick product can be produced efficiently.

[0017] [About the cosmetic composition] The cosmetic composition used in the present invention may be any composition that solidifies into a stick-like form at room temperature, and known cosmetic ingredients can be used. Examples of cosmetic ingredients that can be used include oils and fats, waxes, hydrocarbon oils, fatty acids, higher alcohols, ester oils, and silicone oils; sugars such as monosaccharides and sugar alcohols; water-soluble polymers such as thickeners; surfactants such as anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants; powders such as filler powders, organic colorants, inorganic colorants, pearl pigments, surface-treated powders, and composite pigments; UV absorbers such as organic and inorganic UV absorbers; polyhydric alcohols, plant extracts, amino acids, vitamins, disinfectants and preservatives, antioxidants, sequestering agents, and purified water. These ingredients can be blended appropriately depending on the purpose. In this specification, "room temperature" refers to a temperature range of 1 to 30°C.

[0018] In the present invention, from the viewpoint of preparing a composition that solidifies into a stick at room temperature, the oil is preferably blended in an amount of 50% by mass or more, more preferably 55% by mass or more, based on 100% by mass of the composition. Of these oils, it is desirable to use at least an oil that is solid at room temperature.

[0019] Next, the manufacturing process of the stick product will be described. The manufacturing method of the present invention comprises the following steps. Step (1): Filling step of directly filling a container with a cosmetic composition Step (2): A degassing step in which the filled cosmetic composition is allowed to cool while removing air bubbles from inside the stick using a heated metal wire. Step (3): A solidification step in which the degassed cosmetic composition is allowed to cool or is cooled to solidify it and mold it into a stick shape.

[0020] [Regarding step (1)] Step (1) is a filling step in which the cosmetic composition is directly filled into a container. The filling method is not particularly limited as long as it allows the cosmetic composition to be filled into the container. However, in the present invention, from the viewpoint of efficient production, it is desirable to fill the cosmetic composition directly into the container through a filling port provided at the bottom of the container.

[0021] Furthermore, since the cosmetic composition is ultimately in the form of a stick, it is desirable that the cosmetic composition be filled in a dissolved liquid state during filling, i.e., so-called melt-filling. The temperature at which the cosmetic composition is dissolved is not particularly limited as long as it allows for melt-filling, and may be set appropriately depending on the composition of each component blended in the composition, but from the perspective of producing a high-quality stick product, it is desirable that the temperature be 85°C or higher, and more desirably 90°C or higher.

[0022] [Regarding step (2)] Step (2) is a degassing step in which a heated metal wire is used to degas the air bubbles inside the stick while the cosmetic composition filled in step (1) is allowed to cool. More specifically, this is a step in which the filled cosmetic composition is allowed to cool at room temperature, and at the initial stage when the cosmetic composition begins to form a stick, where the outer wall surface has begun to solidify but the inside of the stick is still soft and unsolidified, a heated metal wire is inserted into the stick through the filling opening of the container to degas the air bubbles present inside the stick. By performing this step, it becomes possible to suppress the occurrence of air pockets.

[0023] The cooling time is not particularly limited as long as it is allowed to cool until the outer wall surface of the cosmetic composition solidifies and the initial stage of stick formation begins, but in the present invention, it is desirable to allow it to cool for 1 to 5 minutes.

[0024] The metal used for the metal wire is not particularly limited as long as it has excellent thermal conductivity, but examples include diamond, silver, copper, gold, aluminum, brass, iron, and stainless steel. Among these metals, copper, aluminum, and stainless steel are preferably used from the viewpoint of excellent cost performance. The diameter of the metal wire is also not particularly limited and may be selected appropriately according to the diameter of the filling port of the container to be used, but is preferably within the range of 2 to 4 mm.

[0025] The temperature of the heated metal wire is not particularly limited as long as it can degas the air bubbles present inside the stick by heat, but in the present invention, from the viewpoint of production efficiency, it is preferably in the range of 100 to 130° C., and more preferably in the range of 105 to 125° C. Furthermore, the time for inserting the metal wire into the stick is also not particularly limited as long as it can sufficiently degas the air bubbles present inside the stick, but in the present invention, it is preferably within 10 seconds from the viewpoint of production efficiency, and more preferably within 7 seconds.

[0026] In the present invention, after inserting a heated metal wire into the stick, it is rotated 2 to 5 times while being removed, thereby efficiently releasing any air bubbles present inside the stick to the outside. This operation is also effective for degassing when air pockets have already formed. In addition, in the present invention, it is more preferable to apply hot air to the filling port through which the metal wire is inserted in addition to these operations. Applying hot air can improve the efficiency of the degassing process and shorten the time it takes to insert the metal wire into the stick.

[0027] Although the occurrence of air pockets can be sufficiently prevented by performing the degassing process once, it is preferable to melt the inside of the stick during the first insertion and then perform the degassing process during the second insertion. The number of times the metal wire is inserted into the stick can be repeated up to three or four times depending on the degree of concern about the occurrence of air pockets.

[0028] [Regarding step (3)] Step (3) is a solidification step in which the cosmetic composition degassed in step (2) is allowed to cool or cooled to solidify it and mold it into a stick shape. Step (3) is not particularly limited, and may be allowed to cool or may be cooled, as long as the cosmetic composition can be solidified and molded into a stick shape, but cooling is preferred from the viewpoint of production efficiency.

[0029] Furthermore, by cooling in the solidification step, it becomes possible to mold the mixture into a stick with a smooth appearance without distortion, etc. The cooling method is not particularly limited and may be air-cooling or water-cooling, but it is preferable to adopt air-cooling, which has the advantages of easy temperature control and simple equipment.

[0030] From the viewpoint of production efficiency, the air-cooling temperature is preferably in the range of 1 to 20° C., more preferably in the range of 5 to 15° C. The time required for air-cooling is also preferably 20 minutes or less, more preferably 15 minutes or less.

[0031] In the present invention, in a method for producing a stick product comprising a container equipped with a mechanism for dispensing the contents by rotating a part of its shape, and a cosmetic composition, the above-described steps (1) to (3) are included, which makes it possible to efficiently and inexpensively suppress the occurrence of air pockets, which has been an issue during production, and thus makes it possible to produce a high-quality stick product.

[0032] Therefore, the stick products produced according to the present invention can be suitably used as various cosmetic products, such as stick-type lipsticks, lip glosses, foundations, makeup bases, and concealers; stick-type sunscreens, stick-type deodorants, and the like. [Example]

[0033] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples. Unless otherwise specified, the blending amounts are expressed in "% by mass", and the blending amounts of all components in the tables are values ​​converted into pure contents.

[0034] [Preparation of cosmetic composition] According to the compositions shown in Table 1 below, cosmetic compositions of formulations 1 to 3 were prepared in a conventional manner.

[0035] [Table 1]

[0036] [Manufacturing stick products] Using the cosmetic compositions of Formulations 1 to 3 above, stick products of Examples 1 to 3 were obtained by the following production method.

[0037] [Manufacturing method] A) The prepared cosmetic composition is heated and melted at 90°C, and then melted and filled at 80 to 85°C through a filling port provided at the bottom of a container. B) After cooling for 1 minute, insert a metal wire (copper or stainless steel wire) at 120°C into the stick through the filling port and remove it while rotating it for 3 seconds to degas it. If degassing is insufficient, repeat the same procedure. C) Cool in air at a temperature of 10 to 13°C for 10 to 15 minutes and mold into sticks.

[0038] The comparative product was a stick product of Comparative Example 1, which was made by using the cosmetic composition of Formulation 1 above, filling in A) above, not carrying out the degassing step B) above, and then air-cooling in C) above, without molding into a stick shape.

[0039] [Air trap confirmation test] The stick-shaped cosmetic compositions were removed from the stick products of Examples 1 to 3 and the stick product of Comparative Example 1, and then sliced ​​into slices to check for the presence or absence of air pockets.

[0040] As a result, no air pockets were found anywhere from the front end to the bottom in the stick products of Examples 1 to 3. On the other hand, air pockets were found near the center of the stick in the stick product of Comparative Example 1. This also demonstrates that by following the steps of the manufacturing method of the present invention, it is possible to suppress the occurrence of air pockets, and to manufacture high-quality stick products efficiently and inexpensively.

Claims

1. A method for producing a stick product comprising a container equipped with a mechanism for dispensing contents by rotating a part of the container, and a cosmetic composition, comprising: a filling step (1) of directly filling a cosmetic composition into a container; a degassing step (2) in which the filled cosmetic composition is allowed to cool while removing air bubbles from inside the stick using a heated metal wire; A solidification step (3) in which the degassed cosmetic composition is allowed to cool or is cooled to solidify it and mold it into a stick shape. A method for producing a stick product, comprising:

2. 2. The method for producing a stick product according to claim 1, wherein in the filling step (1), the cosmetic composition is melted and filled through a filling port provided at the bottom of the container.

3. 3. The method for producing a stick product according to claim 1 or 2, wherein in the degassing step (2), a metal wire is inserted into the inside of the stick through a filling opening.

Images