Cosmetic and injection molding processing method thereof

Abstract

The invention discloses a cosmetic and an injection molding processing method thereof, the cosmetic comprises a cosmetic material body and a cosmetic packaging material, the cosmetic material body is cured and formed in an injection molding mode, and the cosmetic material body contains 10-100 wt% of a thermoplastic substance. The cosmetic injection molding processing method comprises the following steps: adding a cosmetic material body with thermoplasticity into an injection molding machine, fixing a cosmetic packing material in an injection molding mold, injecting the cosmetic material body into a mold cavity of the injection molding mold through the injection molding machine, and cooling and demolding to form the integrated cosmetic combined with the cosmetic packing material. The method is suitable for industrial efficient production, the thermoplastic cosmetic material body is subjected to injection molding and curing molding through an injection molding machine, meanwhile, the cosmetic material body and the cosmetic packaging material can be combined in an embedded injection molding mode, and an embedded structure which cannot be obtained through mechanical assembly is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of cosmetics, and particularly relates to a cosmetic and an injection molding processing method thereof. Background Art

[0002] Insert molding technology is a manufacturing process in which a preform (insert) of a hard material is embedded in an injection mold, and then molten material is injected to make the material combine and solidify with the insert to form an integrated product. This technology is widely used in industries such as automotive, medical, electronics, and connectors. Insert molding technology combines the easy formability of thermoplastic materials with the rigidity, strength, and heat resistance of inserts to manufacture complex and delicate integrated products. It can also increase the flexibility of product design, enabling firm bonding between parts, avoiding secondary processing such as heat melting, welding, and riveting, shortening the assembly time, and reducing costs. There are various types of inserts, which can be made of multiple materials such as metal, cloth, paper, wire, plastic, glass, wood, etc. Insert molding technology combines the advantages of different materials, improves the functionality, durability, and design flexibility of products, while reducing production costs and environmental impacts. Currently, there is no similar application of insert molding technology in the cosmetics field. On the one hand, due to the relatively high strength of injection molding materials in the electronics industry, cosmetic materials often have lower strength and higher appearance requirements. Therefore, before having a certain technical accumulation, no cosmetics companies have adopted such processes. On the other hand, there are relatively mature traditional forming methods for cosmetic materials. Before there is extremely high elastic production pressure in the market, there is insufficient willingness to apply new processes with higher costs. As the market and technical conditions gradually evolve, new injection molding processes will gradually replace traditional process methods.

[0003] For wax and oil products in cosmetics, their materials have the characteristics of basic thermoplastic materials, such as eyebrow pencils and lipsticks. The traditional processes for making wax and oil cosmetics generally include the following steps:

[0004] 1. Material mixing: Mix wax, pigments, and powders in a certain proportion and stir evenly to ensure the consistency of color and texture.

[0005] 2. Melting: Put the mixed materials into a heating device for melting to make them into a liquid state. The melting temperature should be appropriate. Too high will cause material deterioration, and too low will make it difficult to completely melt.

[0006] 3. Forming: Extrude the melted materials into a linear shape or fill them into the required shape through an extrusion device or a filling device, and perform forming processing on a forming machine.

[0007] 4. Cutting: Cut and size the core material formed by the materials to make it meet the required length and diameter.

[0008] 5. Assembly: Fill the pre-made refill or material column into the base to ensure its fixation and stability.

[0009] The above method has many steps, and the components need to be obtained through different technological processes respectively. There are more control points for quality control, and it is not easy to obtain high-quality within-batch consistency. Summary of the Invention

[0010] In view of the defects existing in the traditional extrusion or filling type cosmetic manufacturing technology, the present invention provides a cosmetic and its injection molding processing method, which is suitable for industrialized high-efficiency production. The thermoplastic cosmetic material is injection molded and solidified by an injection molding machine. At the same time, the cosmetic material and the cosmetic packaging can be combined by means of embedded injection molding to achieve an embedded structure that cannot be obtained by mechanical assembly.

[0011] In order to achieve the above object, the present invention adopts the following technical solutions:

[0012] In the first aspect of the present invention, there is provided a cosmetic, which includes a cosmetic material and a cosmetic packaging. The cosmetic material is solidified by injection molding, and the cosmetic material contains 10-100 wt% of thermoplastic substances.

[0013] Adopting the above technical solutions:

[0014] The cosmetic can be an eyebrow pencil, a glue pencil, a lipstick, a lip mud, a paste, etc. Since the cosmetic material contains a specific proportion of thermoplastic substances, the cosmetic material has fluidity at high temperatures and can be cooled and formed in a mold at low temperatures. Therefore, the thermoplastic cosmetic material can be injection molded and solidified by an injection molding machine. The cosmetic packaging is pre-formed by injection molding or other means. When the cosmetic material is solidified by embedded injection molding, the formed cosmetic packaging is fixed in the injection mold, and the cosmetic material is injected into the cavity of the injection mold by the injection molding machine. After cooling and demolding, an integrated cosmetic combined with the cosmetic packaging is formed. It realizes the one-time completion of multiple steps such as melting, forming, and assembling, greatly improving the production efficiency. Moreover, the inner wall of the injection mold can be designed with specific textures or shapes, etc. The formed cosmetic material can obtain surface textures and three-dimensional shape designs, and an embedded structure between the cosmetic material and the cosmetic packaging that cannot be achieved by ordinary assembly can be realized, such as barbs, mutual penetration, intertwined winding structures. The formed cosmetic with an embedded structure has high quality stability and structural strength.

[0015] Further, the cosmetic material contains 30-95 wt% of thermoplastic substances.

[0016] In specific applications, by regulating the content of the thermoplastic substance in the cosmetic material, the fluidity and processability of the cosmetic material are further regulated, and the physical properties (such as hardness and flexibility) and overall cost of the formed cosmetic material are regulated. Considering the above factors comprehensively, preferably, the cosmetic material contains 30-95 wt% of the thermoplastic substance, ensuring that the cosmetic material has appropriate fluidity, facilitating injection into the molding die through an injection molding machine, and being able to maintain a specific shape during the cooling and molding process, and maintaining complex textures and details on the surface.

[0017] Furthermore, the injection molding method is an insert injection molding method.

[0018] According to the type of cosmetics, select the specific injection molding method for the cosmetic material, including two methods: general injection molding or insert injection molding. A horizontal injection molding machine or a vertical injection molding machine can be used during the injection molding process of the cosmetic material.

[0019] For example, when directly processing a lipstick column, a general injection molding method can be adopted. A small-tonnage injection molding machine is directly used to inject the lipstick column. The mold is opened according to the designed outer shape of the required lipstick column. The molding die of the lipstick material is installed on the injection molding machine. The injection molding machine is run, and the thermoplastic lipstick material is injected into the lipstick molding die. The cooling system of the injection molding machine is used to cool the lipstick material in the molding die, and then the mold is opened to obtain a lipstick material with a specific three-dimensional shape and precise patterns or textures on the outer wall.

[0020] When a complete eyebrow pencil product needs to be processed, the insert injection molding method is adopted, which realizes the completion of multiple process steps such as melting, molding, and assembly at one station. Specifically: First, the eyebrow pencil rod is processed and formed, and a fitting structure such as a barb is formed on the docking surface between the eyebrow pencil rod and the eyebrow pencil core. The fitting mold containing the cavity of the eyebrow pencil core and the installation position of the eyebrow pencil rod is installed in the injection molding machine. The already formed and processed eyebrow pencil rod is installed in the installation position of the eyebrow pencil rod in the fitting mold. The injection molding machine injects the thermoplastic eyebrow pencil material into the cavity of the eyebrow pencil core in the fitting mold. Then the mold is cooled, and the material solidifies. The eyebrow pencil material is fitted with the eyebrow pencil rod through the barb structure into an inseparable whole. Then the mold is opened, and the eyebrow pencil product is taken out.

[0021] Furthermore, when the cosmetic material is solidified and formed by the insert injection molding method, the cosmetic packaging is embedded in the cosmetic material, or the cosmetic packaging is embedded in the cosmetic material.

[0022] The cosmetic packaging material can be a thermoplastic material or a non-thermoplastic material, and the cosmetic packaging material is pre-formed by injection molding or other means. The thermoplastic materials of the cosmetic packaging material include, but are not limited to: thermoplastic resins, thermoplastic elastomers. The thermoplastic resins include PP (polypropylene), PE (polyethylene), PETG (polyethylene terephthalate-1,4-cyclohexanedimethanol ester), etc., and the thermoplastic elastomers include TPE (thermoplastic elastomer), TPU (thermoplastic polyurethane elastomer), TPR (thermoplastic rubber), etc.

[0023] Further, the thermoplastic substances in the cosmetic body include one or more mixtures of thermoplastic waxes, thermoplastic elastomers, thermoplastic sugars, and thermoplastic small molecule substances.

[0024] The thermoplastic waxes include microcrystalline wax, polycrystalline wax, natural wax, and amorphous wax. The thermoplastic sugars include single crystal sugar, polycrystalline sugar, and amorphous sugar. The thermoplastic small molecule substances include small molecule oligomers, small molecule monomers, and small molecule mixtures.

[0025] The thermoplastic cosmetic body in eyebrow pencils, glue pens, lipsticks, lip pastes, and creams includes thermoplastic waxes, thermoplastic elastomers, and oils, and in addition, there are also matching fillers, pigments, and functional powders. Thermoplastic elastomers can be added to some lip oil type bodies that require a special texture (plump and fluffy) of the body.

[0026] Further, the cosmetic body is a solid or a paste, mud, gel, or thixotropic fluid with a certain ability to maintain a fixed shape within the conventional use temperature range (-5 to 40 °C).

[0027] For the cosmetic body, the temperature range in which its thermoplastic substances have fluidity is between 25 and 200 °C, and the cooling and forming temperature is between -50 and 25 °C.

[0028] For the cosmetic packaging material, the temperature range in which its thermoplastic material has fluidity is between 50 and 350 °C, and the cooling and forming temperature is between -50 and 200 °C.

[0029] The cosmetic body and the cosmetic packaging material can both include one or more separate individual entities, and the materials of these entities can be the same or different.

[0030] For example, when actually processing lipstick products, in order to improve the processing and production efficiency, there are 12 cavities in the inlay mold, and the shapes of the 12 cavities are the same but the surface texture is the relief pattern of the 12 Chinese zodiac signs. The injection molding machine is used to fill the 12 inlay mold cavities with thermoplastic lipstick body at one time, and after cooling and forming and demolding, a set of 12 Chinese zodiac series lipstick products can be obtained. This method can quickly generate complete sets of cosmetics.

[0031] In the second aspect of the present invention, there is provided an injection molding method for the above-mentioned cosmetics. The thermoplastic cosmetic material is added to an injection molding machine, and the cosmetic packaging is fixed in an injection mold. The cosmetic material is injected into the cavity of the injection mold by the injection molding machine, and after cooling and demolding, an integrated cosmetic combined with the cosmetic packaging is formed.

[0032] The specific steps are as follows:

[0033] (1) The cosmetic packaging is pre-processed and formed;

[0034] (2) The cosmetic material is added to the injection molding machine;

[0035] (3) The processed and formed cosmetic packaging is placed into the injection mold (this step can be omitted if no inserts are required);

[0036] (4) The material is injected into the cavity of the mold by the injection molding machine;

[0037] (5) It is cooled, formed, and demolded to obtain a formed and assembled cosmetic.

[0038] Further, the cosmetic material is fitted with the cosmetic packaging through a barb structure to form an integral whole.

[0039] When the cosmetic material is solidified and formed by the embedded injection molding method, the formed cosmetic packaging is fixed in the injection mold, and the cosmetic material is injected into the cavity of the injection mold by the injection molding machine. After cooling and demolding, an integrated cosmetic combined with the cosmetic packaging is formed. Embedded structures such as barbs, interpenetrating, and intertwined are pre-formed on the mating surface of the cosmetic packaging. After the cosmetic material cools and solidifies, the cosmetic material is fitted with the cosmetic packaging through the barb and other embedded structures to form an inseparable whole. The formed cosmetic with an embedded structure has high quality stability and structural strength. Traditional mechanical assembly cannot obtain cosmetics with complex embedded structures.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] (1) The cosmetic material is solidified and formed by injection molding, and multiple steps such as melting, forming, and assembling are completed at one time, greatly improving production efficiency;

[0042] (2) The inner wall of the injection mold can be designed with specific textures or shapes, etc., and the formed cosmetic material can obtain surface textures and three-dimensional shape designs;

[0043] (3) The forming of the cosmetic packaging and the cosmetic material can be completed successively in the same injection molding process.

[0044] (4) By means of embedded injection molding, the cosmetic material is integrated with the cosmetic packaging into an inseparable whole through engaging structures such as barbs, mutual penetration, and intertwined winding. The formed cosmetic with an engaging structure has high quality stability and structural strength, and traditional mechanical assembly cannot obtain a cosmetic with a complex engaging structure;

[0045] (5) One-time processing of a multi-cavity set can be achieved through the integrated design of the mold. Description of the Drawings

[0046] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0047] Figure 1 It is a schematic diagram of the injection molding process of the injection molding machine in Embodiment 2;

[0048] Figure 2 It is a structural diagram of the eyebrow pencil product obtained by injection molding in Embodiment 2;

[0049] Figure 3 It is a schematic diagram of the working state of the mold cavity of the engaging mold during the injection molding process in Embodiment 3. Detailed Embodiments

[0050] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0051] Embodiment 1

[0052] In this embodiment, a lipstick material column is directly obtained by injection molding of the lipstick material.

[0053] The lipstick material contains 60% of thermoplastic substances (specifically including 50% of thermoplastic wax and 10% of solidifying grease), and the other components are the commonly used fillers, pigments, and functional powders of the lipstick material.

[0054] The injection molding process of the lipstick material column is as follows:

[0055] A small-tonnage injection molding machine is directly used to inject the lipstick material column. The mold is opened according to the designed outer shape of the finished lipstick material column. One mold can be designed with 16 cavities or 32 cavities, and precise patterns or textures are formed on the inner wall of the mold cavity of the molding mold.

[0056] The molding mold of the lipstick material is installed on the injection molding machine, the lipstick material is added to the feeder of the injection molding machine, and the injection molding machine is operated, and it is injected into each mold cavity of the molding mold.

[0057] Utilize the cooling system of the injection molding machine to cool the lipstick material in each cavity of the molding die.

[0058] Open the mold, and use a robotic arm to take out the lipstick material column from the molding die.

[0059] The obtained lipstick material column acquires precise patterns or textures on its outer wall, and the head of the lipstick material column can also obtain a three-dimensional shape. Additionally, during actual processing operations, the lipstick material in the cavity of the molding die can be reheated to restore its fluidity and still be discharged for recycling.

[0060] Example 2

[0061] In this example, an embedded injection molding method is adopted to directly manufacture a complete eyebrow pencil product.

[0062] The eyebrow pencil core material contains 15% of thermoplastic substances (specifically including 10% of thermoplastic wax and 5% of solidifying grease, etc.), and the other components are the commonly used fillers, pigments, and functional powders for the eyebrow pencil core material.

[0063] The eyebrow pencil rod is made of PPS material.

[0064] The embedded injection molding process for the eyebrow pencil product is as follows:

[0065] Use a vertical injection molding machine to implement insert injection molding to directly manufacture a complete eyebrow pencil product.

[0066] Put the eyebrow pencil core material into the feeder of the injection molding machine, and install the combined mold containing the cavity of the eyebrow pencil core and the installation position of the eyebrow pencil rod into the injection molding machine. The combined mold has eight cavities in one mold, and 8 sets of eyebrow pencil rods are neatly arranged in the cavities of the combined mold. There is a barb design on the core base of each eyebrow pencil rod. The eight cavities of the eyebrow pencil have a consistent design in the runner to minimize the difference in the fluidity change of the eyebrow pencil core material when flowing through the runner.

[0067] As Figure 1 shown, operate the injection molding machine, and the injection molding machine injects the eyebrow pencil core material at one time to fill the core parts (the cavity parts of 8 eyebrow pencil cores) of 8 eyebrow pencils at one time. The combined mold cools down and the material solidifies. As Figure 2 shown, the eyebrow pencil core material is combined with the eyebrow pencil rod into an inseparable whole through the barb structure.

[0068] Open the mold, and the robotic arm neatly takes out 8 sets of combined eyebrow pencil products (including the eyebrow pencil rod and the eyebrow pencil core) at one time, and cooperates with another robotic arm that neatly grabs 8 eyebrow pencil caps to cover the lids of 8 eyebrow pencils at one time, thus obtaining 8 complete eyebrow pencil products in one injection molding cycle.

[0069] This method can complete the batch processing of products at one station for multiple process steps including melting the material, forming, and assembling, and can maintain a high level of quality stability and structural strength. At the same time, it can also obtain an eyebrow pencil core with a beautiful structural shape and a textured surface, improving the technical level of the product.

[0070] Example 3

[0071] In this embodiment, a segmented embedded injection molding method is used to directly manufacture a complete eyebrow pencil product.

[0072] The eyebrow pencil core material contains 20% of thermoplastic substances (specifically including 15% of thermoplastic wax and 5% of solidifying grease), and the other components are the commonly used fillers, pigments, and functional powders for the eyebrow pencil core material.

[0073] The eyebrow pencil rod is made of ABS material.

[0074] The segmented embedded injection molding process of the eyebrow pencil product is as follows:

[0075] A horizontal injection molding machine is used to implement segmented insert injection molding to directly manufacture a complete eyebrow pencil product.

[0076] The eyebrow pencil core material is added to one of the feeders of the injection molding machine, and the eyebrow pencil rod material is added to the injection molding machine from another feeder. The combined mold containing the eyebrow pencil core cavity and the eyebrow pencil rod cavity is installed in the injection molding machine. The combined mold has eight cavities per mold, and the eight cavity cavities in the combined mold are specially designed. The molding cavity of the eyebrow pencil core material (core mold cavity) and the molding cavity of the rod material (holder mold cavity) are opened together according to the assembly position relationship, and a split switch (switch valve) that can successively isolate one side of the cavity is set between the two parts, so that the eyebrow pencil core material and the eyebrow pencil rod material can be successively injection molded in different separated cavities.

[0077] The injection molding machine first injects the eyebrow pencil rod material at one time to fill the eight parts of the eyebrow pencil rods in the combined mold at one time. The mold is cooled to make the eyebrow pencil rod material cool and solidify. Then the injection molding machine injects the eyebrow pencil core material again to fill the eight parts of the eyebrow pencil cores in the combined mold at one time. The mold is further cooled to make the eyebrow pencil core material cool and solidify, and the eyebrow pencil core material is combined with the eyebrow pencil rod into an inseparable whole through a barb structure (the working state of the mold cavity of the combined mold during the specific injection molding process is as Figure 2 shown).

[0078] The mold is opened, and the manipulator neatly takes out eight sets of assembled eyebrow pencil products (including the eyebrow pencil rod and the eyebrow pencil core) at one time, and cooperates with another manipulator that neatly grabs eight eyebrow pencil caps to cover the lids for eight eyebrow pencils at one time, so that eight complete eyebrow pencil products are obtained in one injection molding cycle.

[0079] This method can integrate the melting, molding, and assembly of the eyebrow pencil rod and the eyebrow pencil core, successively complete the injection molding of the eyebrow pencil rod and the eyebrow pencil core at one station, and tightly fit the two together, greatly improving the production efficiency.

[0080] Example 4

[0081] In this example, an embedded injection molding method is used to obtain a series of lipsticks of 12 Chinese zodiac signs.

[0082] The lipstick body contains 50% of thermoplastic substances (specifically including 45% of thermoplastic wax, 5% of solidifying grease, and thermoplastic elastomer), and the other components are common fillers, pigments, and functional powders for lipstick bodies.

[0083] The lipstick shell is made of PPS material.

[0084] The injection molding process of the lipstick product is as follows:

[0085] Design an embedded molding die. There are 12 cavities in the embedded molding die. Each cavity includes a lipstick column cavity and a lipstick shell installation position. The shapes of the 12 cavities are the same, but the inner surface textures of the lipstick column cavities in the 12 cavities are relief patterns of 12 Chinese zodiac signs. Arrange 12 sets of lipstick shells as a whole at the lipstick shell installation positions in the cavities of the embedded die.

[0086] Use an injection molding machine to inject the lipstick column. Install the embedded molding die of the lipstick body on the injection molding machine, add the lipstick body to the feeder of the injection molding machine, and run the injection molding machine to inject it into each cavity of the embedded molding die.

[0087] Utilize the cooling system of the injection molding machine to cool the lipstick body in each cavity of the embedded molding die.

[0088] Open the die, and the manipulator neatly takes out the series of lipsticks of 12 Chinese zodiac signs that are embedded together at one time, and cooperates with another manipulator that neatly grabs 12 lipstick caps to cover the 12 zodiac series lipsticks with caps at one time, so as to obtain a complete set of 12 zodiac series lipsticks in one injection molding cycle.

[0089] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cosmetic, characterized in that, The cosmetic product includes a cosmetic body and a cosmetic package. The cosmetic body is solidified and formed by an injection molding method, and the cosmetic body contains 10 to 100 wt% of a thermoplastic substance.

2. The cosmetic according to claim 1, characterized in that, The cosmetic body contains 30 to 95 wt% of a thermoplastic substance.

3. The cosmetic according to claim 1, characterized in that, The injection molding method is an insert injection molding method.

4. The cosmetic according to claim 3, characterized in that, When the cosmetic body is solidified and formed by the insert injection molding method, the cosmetic package is embedded in the cosmetic body, or the cosmetic package is embedded in the cosmetic body.

5. The cosmetic according to claim 1, characterized in that, The thermoplastic substance in the cosmetic body includes one or more mixtures of thermoplastic wax, thermoplastic elastomer, thermoplastic sugar, and thermoplastic small molecule substance.

6. The cosmetic according to claim 5, characterized in that, The cosmetic package is made of a thermoplastic material or a non-thermoplastic material.

7. The cosmetic according to claim 6, characterized in that, The thermoplastic material in the cosmetic package includes a thermoplastic resin and / or a thermoplastic elastomer.

8. The cosmetic according to claim 1, characterized in that, The cosmetic body is a solid or a paste, mud, gel, or thixotropic fluid having a certain ability to maintain a fixed shape within the use temperature range.

9. An injection molding method for a cosmetic according to any one of claims 1 to 8, characterized in that, The thermoplastic cosmetic body is added to an injection molding machine, the cosmetic package is fixed in an injection mold, and the cosmetic body is injected into the cavity of the injection mold by the injection molding machine. After cooling and demolding, an integrated cosmetic product combined with the cosmetic package is formed.

10. The injection molding method of the cosmetic according to claim 9, characterized in that, The cosmetic body is fitted with the cosmetic package through an undercut structure, an interpenetrating structure, or an intertwined winding structure to form a whole.

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