Interior component, manufacturing method thereof, and vehicle component

Abstract

An interior component which is harmless to the human body and eco-friendly is disclosed. According to one aspect, provided is an interior component comprising: an injection-molded product having an embossed pattern on at least one surface thereof; and a printed pattern in contact with the injection-molded product. According to another aspect of the present invention, provided is a method of manufacturing an interior component, the method comprising the steps of: preparing an embossing mold; adjusting the gloss of the embossing mold; forming an injection-molded product having an embossed pattern by adding a raw material to an injection molding machine equipped with the gloss-adjusted embossing mold; and forming a printed pattern on the surface of the injection-molded product by transferring ink thereonto.

Description

Interior parts, manufacturing methods thereof and automobile parts

[0001] The present invention (Disclosure) relates to interior parts, and more specifically, to interior parts, a method for manufacturing the same, and automobile parts.

[0002] Typically, automotive interior and exterior materials for passenger cars, vans, and other vehicles are injection-molded products. Research is being conducted on various surface treatment methods to impart color and pattern to these injection-molded products.

[0003] For example, surface treatment methods for injection-molded products can include applying paint, printing films, or natural materials. However, paint coatings contain various toxic volatile organic compounds, which can cause adverse effects on the human body, including loss of appetite, headaches, confusion, coughing, chest pain, and increased heart rate, and can also pollute the environment. Additionally, the increased manufacturing costs associated with paint coatings are also a concern.

[0004] According to one aspect of the present invention, an interior part is provided that is harmless to the human body and environmentally friendly.

[0005] According to another aspect of the present invention, an interior part capable of effectively controlling the gloss of the interior part is provided.

[0006] According to another aspect of the present invention, an interior part capable of effectively concealing the appearance of an injection-molded product is provided.

[0007] According to another aspect of the present invention, an interior part having an attractive appearance, excellent texture, and various patterns is provided.

[0008] According to another aspect of the present invention, a method for manufacturing an eco-friendly interior part is provided while reducing manufacturing costs.

[0009] According to another aspect of the present invention, an automobile part including the interior part is provided.

[0010] The purposes of the present invention are not limited to those mentioned above, and other unmentioned purposes and advantages of the present invention can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the purposes and advantages of the present invention can be realized by the means and combinations thereof described in the specification.

[0011] [1] According to one aspect of the present invention, an interior part is provided, which includes an injection-molded article having an embossed pattern on at least one side and a printed pattern in contact with the injection-molded article.

[0012] [2] In the above [1], the injection molded product may include a plastic resin.

[0013] [3] In the above [1] or [2], the injection molded product may further include at least one selected from the group consisting of a filler, a first matting agent, a flame retardant, and a colorant.

[0014] [4] In the above [3], the content of the first quencher may be 0.01 to 10 parts by weight based on 100 parts by weight of the plastic resin.

[0015] [5] In any one of the above [1] to [4] and the following

[0010] to

[0015] , the printing pattern may include one selected from the group consisting of a first sub-pattern formed at a position corresponding to the embossed pattern, a second sub-pattern formed at a position not corresponding to the embossed pattern, and a combination thereof.

[0016] [6] In the above [5], the average thickness (average height) of the first sub-pattern may be 4 to 20 ㎛.

[0017] [7] In any one of the above [1] to [6], the printed pattern includes a second matting agent, and the content of the second matting agent may be 0.1 to 3.1 wt% based on the total weight of the printed pattern.

[0018] [8] In any one of the above [1] to [7], the injection molded product includes a first matting agent, and the weight ratio of the first matting agent and the second matting agent may be 1:0.5 to 1:1.

[0019] [9] In any one of the above [1] to [8], the gloss of the interior part may be 2 to 50 GU under measurement conditions of an incident angle of 60° in accordance with JIS Z8741.

[0020]

[0010] In any one of the above [1] to [9], at least one surface of the injection-molded product may further include a microscopic micro-pattern that can be confirmed with an optical microscope at a magnification of 300 times or more. Here, the “microscopic micro-pattern” is a pattern that is difficult to confirm with the naked eye, unlike an “embossed pattern” that can be confirmed with the naked eye, but can be confirmed with an optical microscope at a magnification of 300 times or more, and may be irregularly and randomly distributed. According to some embodiments of the present invention, since at least one surface of the injection-molded product further includes a micro-pattern, when light strikes the surface of the injection-molded product, a scattering reflection phenomenon can be adjusted to an appropriate level, thereby easily implementing gloss adjustment of interior parts. For example, the injection-molded product may include a first surface and a second surface opposite to the first surface, the first surface may include a concave surface and a convex surface, and the second surface may include a flat surface. For example, the first surface may be the front surface of the injection molded product, and the second surface may be the back surface (rear surface) of the injection molded product. Here, the shape of the concave surface is not particularly limited, and may be a shape that sinks in the thickness direction (inward direction) of the injection molded product when the front surface of the injection molded product is observed from above. In addition, the shape of the convex surface is not particularly limited, and may be a shape that protrudes in the thickness direction (outward direction) of the injection molded product. In this specification, "flat" may mean that the step (height difference) between any first point and any second point on a flat surface may be 1 ㎛ or less, 0.9 ㎛ or less, 0.8 ㎛ or less, 0.7 ㎛ or less, 0.6 ㎛ or less, 0.5 ㎛ or less, 0.4 ㎛ or less, 0.3 ㎛ or less, 0.2 ㎛ or less, 0.1 ㎛ or less, 0.01 ㎛ or less, 0.001 ㎛ or less, or 0.0001 ㎛ or less, and specifically, may be 0 ㎛. In one example, some of the concave surfaces and some of the convex surfaces may each independently include a flat surface.

[0021] [10-a] In any one of the above [1] to

[0010] , the interior component has P calculated according to the following Equation 1 of 20 to 85%. Specifically, the P may be 25% or more, 27% or more, 35% or more, 49% or more, 60% or more, 70% or more, or 80% or more, and may be 85% or less, 83% or less, 70% or less, 60% or less, or 50% or less. Here, by adjusting the P of the following Equation 1 to the above numerical range, it is possible to effectively conceal appearance defects formed on the surface of the injection molded product during the injection molding process, thereby implementing an effect of further minimizing the appearance defects.

[0022] [Formula 1]

[0023] P=[|(P f -P i )| / (P i )] X 100

[0024] In the above equation 1: P means the rate of change of the 10-point average roughness of the interior part, and P i is the 10-point mean roughness (Rz) of the interior part control group including a paint layer between the injection molded product and the printed pattern, and P f is the ten-point mean roughness (Rz) of the interior parts, and |(P f -P i )|is (P f -P i ) means the absolute value of

[0011] According to another aspect of the present invention, a method for manufacturing an interior part is provided, including: (S1) preparing an embossing mold; (S2) adjusting the gloss of the embossing mold; (S3) adding a raw material to an injection molding machine equipped with the embossing mold having the adjusted gloss to form an injection molded article having an embossing pattern; and (S4) transferring ink onto a surface of the injection molded article to form a printed pattern.

[0025]

[0012] In the above

[0011] , the step (S2) may include a step of spraying an abrasive containing at least one of aluminum oxide and glass beads onto the surface of the embossing mold.

[0026]

[0013] In the above

[0012] , the weight ratio of the aluminum oxide and the glass beads may be 1:9 to 9:1.

[0027]

[0014] In any one of the above

[0011] to

[0013] , the step (S3) may include a step of adjusting the moisture content to 0.4 wt% or less based on the total weight of the raw material.

[0028]

[0015] In any one of the above

[0011] to

[0014] , the ink may contain more than 0 and less than 6 parts by weight of the second matting agent relative to 100 parts by weight of the main body of the ink.

[0029]

[0016] In any one of the above

[0011] to

[0014] , the step (S4) may include a step of forming a printing pattern using a pad printing method.

[0030]

[0017] According to another aspect of the present invention, an automobile part is provided, which includes an interior part according to any one of the above [1] to

[0010] and [10-a]. Here, the interior part may be manufactured by a manufacturing method according to any one of the above

[0011] to

[0016] .

[0031] The solutions to the above problems are not exhaustive and may be combined with several embodiments of the present disclosure. The various features of the present invention and their corresponding advantages and effects can be understood in more detail by referring to the detailed description below.

[0032] According to one aspect of the present invention, it is possible to implement an interior part that is harmless to the human body, environmentally friendly, and has effectively controlled gloss.

[0033] According to another aspect of the present invention, it is possible to implement an interior part having an attractive appearance, excellent texture, and various patterns while effectively concealing external defects of an injection-molded product.

[0034] According to another aspect of the present invention, a method for manufacturing environmentally friendly interior parts can be implemented while reducing manufacturing costs.

[0035] In addition to the aforementioned effects, specific effects of the present invention are described below along with specific details for implementing the invention. Furthermore, the effects of the present invention are not limited to the effects described above and can be readily achieved using the means and combinations thereof described in the specification.

[0036] FIG. 1a is a cross-sectional view of an interior part according to one embodiment of the present invention and a process in which ink is transferred using a silicone pad to form a printed pattern.

[0037] Figure 1b is an enlarged view of the first sub-pattern of Figure 1a.

[0038] Figure 2 is a flow chart showing a method for manufacturing an interior part according to one embodiment of the present invention.

[0039] Fig. 3a is an actual photograph of an interior part according to Comparative Example 1, Fig. 3b is an optical microscope photograph (x300) of point 1 shown in Fig. 3a, and Fig. 3c is an optical microscope photograph (x300) of point 2 shown in Fig. 3a.

[0040] Fig. 4a is an actual photograph of an interior part according to Example 1, Fig. 4b is an optical microscope photograph (x300) of point 1 shown in Fig. 4a, and Fig. 4c is an optical microscope photograph (x300) of point 2 shown in Fig. 4a.

[0041] FIG. 5 is an optical microscope photograph (x300) showing the front and back sides of an injection-molded product in a walnut wood grain product and an ash wood grain product of an interior part according to Example 3.

[0042] In this specification, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0043] In this specification, expressions such as "first," "second," "first," "second," "(S1)", "(S2)", etc. may describe various components, regardless of order and / or importance, and do not limit the components. These expressions may be used to distinguish one component from another. For example, without departing from the scope of the present disclosure, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

[0044] If multiple embodiments are described in this specification, the embodiments may be combined unless specifically stated otherwise. In this case, the effects of the present invention may be defined as including the effects derived from each embodiment and the effects resulting from the organic combination of the embodiments. For example, even if Embodiments 1 and 2 are described independently in this specification, Embodiments 1 and 2 may be organically combined with each other, unless the context clearly indicates otherwise, and the effects of the present invention may include the effects resulting from the combination of Embodiments 1 and 2.

[0045] The numerical range indicated by the term "to" in this specification refers to a numerical range that includes the values ​​described before and after the term as the lower limit and the upper limit, respectively. When multiple numerical values ​​are disclosed as the upper and lower limits of an arbitrary numerical range, the numerical range disclosed in this specification can be understood as any numerical range that has any one of the multiple lower limit values ​​and any one of the multiple upper limit values ​​as the lower limit and the upper limit, respectively. For example, when a to b, or c to d is described in the specification, it can be understood that a or more and b or less, a or more and d or less, c or more and d or less, or c or more and b or less is described.

[0046] According to one aspect of the present invention, an interior part is provided, comprising an injection-molded article having an embossed pattern on at least one surface and a printed pattern in contact with the injection-molded article. According to one aspect of the present invention, by having the printed pattern in contact with the injection-molded article, not only can external defects formed on the surface of the injection-molded article during the injection molding process be effectively concealed, but also an interior part having excellent texture, an attractive appearance, and a variety of patterned sensations can be realized.

[0047] Hereinafter, the configuration of the present invention will be described in more detail with reference to the drawings.

[0048] 1. Interior parts

[0049] FIG. 1a is a cross-sectional view of an interior part according to one embodiment of the present invention and a process in which ink is transferred using a silicone pad to form a printed pattern.

[0050] Figure 1b is an enlarged view of the first sub-pattern of Figure 1a.

[0051] Referring to FIGS. 1a and 1b, an interior component (100) according to the present invention includes an injection molded article (10) and a printed pattern (20).

[0052] Injection (10)

[0053] The injection molded article (10) according to the present invention is formed through injection molding and can serve as a base material for interior components. Specifically, by utilizing the injection molding process, injection molded articles of complex shapes can be manufactured at low cost and on a mass production scale.

[0054] The injection-molded article (10) according to the present invention has an embossed pattern (12) on at least one surface. Here, the embossed pattern (12) may refer to a structure or region in which concave and convex portions are alternately formed when observing a vertical cross-section of the injection-molded article. Specifically, by providing the embossed pattern (12) on at least one surface of the injection-molded article (10), the effect of effectively concealing external defects formed on the surface of the injection-molded article can be realized. For example, the external defects may be a weld line, a flow mark, etc. Here, a weld line refers to a line where two or more flow fronts meet on the surface of the injection-molded article, and a flow mark refers to a phenomenon in which traces of the molten resin flow appear in a stripe shape when the cooling of the initially introduced resin is too fast in the process of molding the injection-molded article, creating a boundary with the subsequently introduced resin. In addition, gas marks, shrinkage, foreign substances, and surface scratches may appear as defects on the surface of the injection-molded article.

[0055] The injection-molded article according to the present invention includes a plastic resin to effectively control the physical properties according to the intended use of the interior component. For example, the physical properties of the injection-molded article may vary depending on the type of plastic resin.

[0056] In some examples, the plastic resin is not particularly limited and may vary depending on the purpose of the interior part. For example, the plastic resin may include at least one selected from the group consisting of polycarbonate resins, polyester resins, polyolefin resins, and acrylonitrile butadiene styrene copolymer (ABS) resins. Here, the polyester resin may include at least one selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and mixtures thereof.

[0057] In some examples, the content of the plastic resin is not particularly limited, but may be specifically 50 wt% or more, 55 wt% or more, 60 wt% or more, 70 wt% or more, or 80 wt% or more based on the total weight of the injection molded article, and specifically may be any one of the multiple lower limits and 90 wt% or less.

[0058] In this specification, "weight average molecular weight" or "number average molecular weight" refers to a standard polystyrene-converted molecular weight, which can be analyzed using a GPC (Gel permeation chromatography) device. For example, in the case of a GPC analysis method, the developing solvent may be Tetrahydrofuran (THF), the column may be PL Olexis from Polymer Laboratories, the sample concentration may be 5 mg / mL, the sample injection amount may be 100 ㎕, the flow rate may be 1 mL / min, the detector may be Agilent High Temperature RI detector, and the column temperature may be set to 40°C.

[0059] Meanwhile, the molecular weight distribution is the weight average molecular weight relative to the number average molecular weight.

[0060] In some embodiments of the present invention, the molecular weight distribution (polydispersity) of the plastic resin may be 1 to 20. According to some embodiments of the present invention, by controlling the molecular weight distribution of the plastic resin within the above numerical range, it is easy to control the gloss of the injection-molded product, and as a result, the effect of effectively controlling the gloss of the interior parts can be realized.

[0061] Melt flow rate (MFR) refers to the mass of molten material extruded from the die bore per 10 minutes under specified temperature and pressure conditions.

[0062] In some embodiments of the present invention, the melt flow rate (MFR) of the plastic resin may be 3 to 20 g / 10 min, 4 to 10 g / 10 min, 5 to 9 g / 10 min, or 6 to 8 g / 10 min. According to some embodiments of the present invention, by controlling the melt flow rate of the plastic resin within the above numerical range, it is easy to control the gloss of the injection-molded product, and as a result, the effect of effectively controlling the gloss of the interior part can be implemented.

[0063] In some embodiments of the present invention, the injection-molded product (10) may further include at least one selected from the group consisting of a filler, a first matting agent, a flame retardant, and a colorant, and specifically may include at least one of the first matting agent and the colorant, and more specifically may include the first matting agent and the colorant. According to some embodiments of the present invention, since the injection-molded product includes the first matting agent and the colorant, it is possible to effectively control the gloss of the interior part and at the same time impart color to the interior part without forming a paint layer.

[0064] The filler according to the present invention can enhance the mechanical properties or strength of the injection-molded product. Furthermore, the filler according to the present invention can be a factor that controls the glossiness of interior parts. Specifically, the glossiness of the interior part can vary depending on the type, shape, average particle size, and content of the filler, thereby varying the degree of transparency of the interior part.

[0065] In some embodiments of the present invention, the filler may include at least one selected from the group consisting of carbonates, sulfates, silicates, and nitrides. Specifically, the carbonate may include at least one selected from the group consisting of calcium carbonate, magnesium carbonate, zinc carbonate, and barium carbonate. Specifically, the sulfate may include any one selected from the group consisting of calcium sulfate, barium sulfate, and combinations thereof. Specifically, the silicate may include at least one selected from the group consisting of talc, wollastonite, mica, clay, kaolin, activated clay, and glass fiber. Specifically, the nitride may be aluminum nitride or silicon nitride. According to some embodiments of the present invention, when a carbonate is used as the filler, the gloss adjustment of the injection-molded product becomes easy, and the effect of effectively adjusting the gloss of the interior parts can be realized.

[0066] In some embodiments of the present invention, the shape of the filler may be at least one of spherical, plate-shaped, columnar, needle-shaped, whisker-shaped, and fibrous, and specifically, plate-shaped. Specifically, when a plate-shaped filler is selected among various shapes, the gloss adjustment of the injection-molded product can be easily achieved, thereby effectively controlling the gloss of the interior parts. Plate-shaped fillers can effectively control the gloss of the interior parts by dispersing light well on the surface compared to other shapes.

[0067] In some embodiments of the present invention, the content of the filler may be 1 to 20 parts by weight, 2 to 15 parts by weight, 5 to 14 parts by weight, 7 to 12 parts by weight, or 9 to 10 parts by weight, based on 100 parts by weight of the plastic resin (solid content). According to some embodiments of the present invention, by adjusting the content of the filler within the above numerical range, it is easy to adjust the gloss of the injection-molded product, and the effect of effectively adjusting the gloss of the interior part can be implemented.

[0068] In this specification, the average particle diameter of the particles is the particle diameter (D) when the cumulative percentage in the volume-based particle size distribution curve is 50% when measured by a laser diffraction particle size distribution measuring device. 50 ) can be defined. For example, the average particle diameter of the particles can be calculated by dispersing the target particles in a dispersion medium, introducing them into a commercially available laser diffraction particle size measuring device (e.g., Microtrac S3500), and measuring the difference in diffraction pattern according to particle size when the particles pass through a laser beam.

[0069] In some embodiments of the present invention, the average particle diameter (D) of the filler 50 ) may be 0.1 to 3.0 ㎛, 0.5 to 2.5 ㎛, 0.7 to 2.0 ㎛, 0.8 to 1.5 ㎛, or 0.9 to 1.0 ㎛. According to some embodiments of the present invention, by adjusting the average particle diameter of the filler within the above numerical range, it is easy to adjust the gloss of the injection-molded product, and thus the effect of effectively adjusting the gloss of the interior part can be implemented.

[0070] The first matting agent according to the present invention can effectively control the gloss of interior parts by lowering the surface gloss of the injection-molded product.

[0071] In some embodiments of the present invention, the average particle diameter (D) of the first quencher 50) may be 1 to 5 μm, 1 to 4 μm, 1 to 3 μm, 1 to 2 μm, or 1.7 to 2 μm. According to some embodiments of the present invention, by adjusting the average particle diameter of the first matting agent within the above numerical range, the glossiness of the interior part can be adjusted to an appropriate level while maintaining excellent adhesion of the printed pattern to the injection-molded product.

[0072] In some embodiments of the present invention, the BET specific surface area of ​​the first quencher is 100 to 200 m 2 / g, 120 to 190 m 2 / g, 130 to 180 m 2 / g, 140 to 170 m 2 / g, or 150 to 160 m 2 / g may be. According to some embodiments of the present invention, by controlling the BET specific surface area of ​​the first matting agent within the above numerical range, the gloss of the interior part can be controlled to an appropriate level while maintaining excellent adhesion of the printed pattern to the injection-molded article.

[0073] In some examples, the first matting agent is not particularly limited and may specifically include one or more selected from the group consisting of silica, wax, and polymethyl urea resin. Specifically, the wax may include one or more selected from the group consisting of polyethylene, polypropylene, and polyamide.

[0074] In some examples, the content of the first matting agent may be 0.01 to 10 parts by weight, 0.1 to 10 parts by weight, 1 to 9 parts by weight, 1 to 5 parts by weight, or 1 to 2 parts by weight, based on 100 parts by weight of the plastic resin (solid content).

[0075] The flame retardant according to the present invention can suppress the flammability of an injection molded product.

[0076] In some examples, the flame retardant may include one or more selected from the group consisting of halogen-based flame retardants, phosphorus-based flame retardants, melamine-based flame retardants, and inorganic flame retardants.

[0077] In some examples, the content of the flame retardant is not particularly limited, and may be specifically 0.1 to 10 parts by weight, 1 to 9 parts by weight, 1 to 5 parts by weight, or 1 to 2 parts by weight, based on 100 parts by weight of the plastic resin (solid content).

[0078] The colorant according to the present invention, incorporated into the injection-molded product, imparts color to the injection-molded product without the need for a separate coating process such as paint. This eliminates the need for a paint layer, which typically contains toxic volatile organic compounds, thereby reducing manufacturing costs and enabling the creation of environmentally friendly and human-safe interior components.

[0079] In some examples, the colorant may be a material capable of imparting color to the injection-molded article, and may specifically include at least one or more of dyes and pigments commonly used in the relevant technical field.

[0080] In some examples, the content of the colorant is not particularly limited, and may be specifically 0.1 to 10 parts by weight, 1 to 9 parts by weight, 1 to 5 parts by weight, or 1 to 2 parts by weight, based on 100 parts by weight of the plastic resin (solid content).

[0081] In some embodiments of the present invention, the average depth (height, H1) of the embossed pattern (12) may be 20 to 200 μm, 30 to 190 μm, 40 to 180 μm, 50 to 170 μm, or 100 to 170 μm. By adjusting the average depth (height) (H1) of the embossed pattern (12) within the above numerical range, it is possible to effectively conceal appearance defects formed on the surface of an injection-molded product formed during the injection molding process, and to implement interior parts having excellent texture, an attractive appearance, and a variety of patterned sensations. For example, the average depth (height) of the embossed pattern can be adjusted through a process of forming an embossed mold by treating the surface of a general mold.

[0082] In some embodiments of the present invention, at least one surface of the injection-molded product (10) may further include an irregularly and randomly formed micro-pattern in addition to the embossed pattern (12). Specifically, the micro-pattern may be formed by spraying an abrasive onto the surface of the embossed mold. For example, the depth (height) of the micro-pattern may be lower than the depth (height) of the embossed pattern (12). According to some embodiments of the present invention, since the micro-pattern is additionally formed on the surface of the injection-molded product, the reflection phenomenon in which light scatters when it hits the surface of the injection-molded product can be adjusted to an appropriate level, compared to an injection-molded product having only an embossed pattern. Accordingly, the gloss adjustment of interior parts can be made easier.

[0083] In some examples, the depth (height) of the above-mentioned fine pattern is not particularly limited, but may be 190 ㎛ or less, 180 ㎛ or less, 170 ㎛ or less, 160 ㎛ or less, 150 ㎛ or less, 140 ㎛ or less, 130 ㎛ or less, 120 ㎛ or less, 110 ㎛ or less, 100 ㎛ or less, 90 ㎛ or less, 80 ㎛ or less, 70 ㎛ or less, 60 ㎛ or less, 50 ㎛ or less, 40 ㎛ or less, 30 ㎛ or less, 20 ㎛ or less, 10 ㎛ or less, 9 ㎛ or less, 8 ㎛ or less, 7 ㎛ or less, 6 ㎛ or less, 5 ㎛ or less, 4 ㎛ or less, 3 ㎛ or less, 2 ㎛ or less, or 1 ㎛ or less, and specifically, may be any one of the plurality of lower limits of 0.01 ㎛ or more.

[0084] In some non-limiting examples, the emboss pattern may vary depending on the laser or chemical etching method used to process the mold surface.

[0085] In some non-limiting examples, the embossed pattern may represent a fabric texture, a stone texture, a marble texture, a wood texture, or an ash texture.

[0086] Print pattern

[0087] In this specification, the term "printed pattern" may include a case where the pattern is formed only in a part of the area where the pattern exists when observed. For example, the printed pattern may be defined as including a flat shape, a non-flat shape, and a combination thereof; or a continuous shape, a discontinuous shape, and a combination thereof. For example, when another element is formed in a pattern shape directly on one element, the coverage of the other element with respect to the surface of the one element may be 1% or more, 5% or more, 10% or more, 20% or more, 30% or more, 40% or more, 50% or more, 60% or more, 70% or more, 80% or more, 85% or more, 90% or more, or 95% or more.

[0088] The printing pattern (20) according to the present invention comes into contact with the injection-molded product (10). Specifically, by the printing pattern (20) coming into contact with the injection-molded product (10), the appearance defects formed on the surface of the injection-molded product can be effectively concealed.

[0089] Meanwhile, referring to FIG. 1a, the injection molded product (10) or interior part (100) may include a first region (R1) formed at a position corresponding to the embossed pattern (12) and a second region (R2) formed at a position not corresponding to the embossed pattern (12).

[0090] In some embodiments of the present invention, the printing pattern (20) may include any one selected from the group consisting of a first sub-pattern (20a) formed at a position corresponding to the embossed pattern (12), a second sub-pattern (20b) formed at a position not corresponding to the embossed pattern, and a combination thereof, and specifically, may include both the first sub-pattern (20a) and the second sub-pattern (20b). According to some embodiments of the present invention, by including both the first sub-pattern and the second sub-pattern, it is possible to implement interior parts having excellent various pattern senses and textures, and also to effectively conceal external defects of the injection-molded product.

[0091] For example, the first sub-pattern (20a) may be formed in the first region (R1), and the second sub-pattern (20b) may be formed in the second region (R2).

[0092] In some embodiments of the present invention, the average thickness (height) (H2) of the first sub-pattern (20a) may be lower than the average depth (height) (H1) of the embossed pattern (12). According to some embodiments of the present invention, by adjusting the average thickness (height) (H2) of the first sub-pattern (20a) to be lower than the average depth (height) (H1) of the embossed pattern (12), it is possible to effectively conceal the appearance defects formed in the embossed pattern of the injection-molded product, while simultaneously implementing interior parts having excellent texture and various patterns.

[0093] In some examples, the average thickness (height) (H2) of the first sub-pattern (20a) may be 4 to 20 μm, 5 to 18 μm, 6 to 15 μm, 7 to 14 μm, 8 to 13 μm, 9 to 12 μm, or 10 to 11 μm.

[0094] In some embodiments of the present invention, the printing pattern (20) may include a base resin of ink (20i), a second matting agent, and a coloring agent.

[0095] The base resin according to the present invention can transfer the material contained in the ink to the printing surface and simultaneously serve as a binder. For example, the base resin is not particularly limited and may include a polyurethane resin or an acrylic resin.

[0096] The second matting agent according to the present invention may be a factor that controls the glossiness of interior parts and at the same time controls the adhesion of a printed pattern to an injection-molded article.

[0097] In some embodiments of the present invention, the content of the second matting agent may be 0.1 to 3.1 wt%, 0.4 to 3.1 wt%, 0.4 to 2.7 wt%, 0.9 to 2.7 wt%, or 0.9 to 1.8 wt%, based on the total weight of the printed pattern (or the total solid content of the ink). According to some embodiments of the present invention, when the content of the second matting agent satisfies the numerical range, the glossiness of the interior part can be adjusted to an appropriate level while maintaining excellent adhesion of the printed pattern to the injection-molded article.

[0098] In some embodiments of the present invention, the second quencher may be the same as or different from the first quencher.

[0099] In some embodiments of the present invention, the average particle diameter (D) of the second quencher 50 ) may be 1 to 5 μm, 1 to 4 μm, 1 to 3 μm, 1 to 2 μm, or 1.7 to 2 μm. According to some embodiments of the present invention, by adjusting the average particle diameter of the second matting agent within the above numerical range, the glossiness of the interior part can be adjusted to an appropriate level while maintaining excellent adhesion of the printed pattern to the injection-molded product.

[0100] In some embodiments of the present invention, the BET specific surface area of ​​the second quencher is 100 to 200 m 2 / g, 120 to 190 m 2 / g, 130 to 180 m 2 / g, 140 to 170 m 2 / g, or 150 to 160 m 2 / g may be. According to some embodiments of the present invention, by controlling the BET specific surface area of ​​the second matting agent within the above numerical range, the gloss of the interior part can be controlled to an appropriate level while maintaining excellent adhesion of the printed pattern to the injection-molded article.

[0101] For example, the moisture content of the second matting agent may be 1 to 5 wt%, 2 to 4 wt%, or 3 to 4 wt% based on the total weight of the second matting agent.

[0102] For example, the oil absorption capacity of the second quencher may be 200 ml / 100 g to 300 ml / 100 g.

[0103] In some embodiments of the present invention, the injection-molded article includes a first matting agent, and a weight ratio of the first matting agent and the second matting agent (first matting agent: second matting agent) may be 1:0.5 to 1:1. The weight ratio of the first matting agent and the second matting agent may be a factor that controls the glossiness of the interior part and at the same time controls the adhesion of the printed pattern to the injection-molded article. According to some embodiments of the present invention, since the weight ratio of the first matting agent and the second matting agent satisfies the numerical range, the glossiness of the interior part can be controlled to an appropriate level and at the same time the adhesion of the printed pattern to the injection-molded article can be maintained excellently.

[0104] In some embodiments of the present invention, the first sub-pattern (20a) and the second sub-pattern (20b) may each independently include a colorant that is identical or different from each other. Here, the colorants being identical or different from each other may mean that at least one of the composition, color, and content of the colorant are identical or different from each other.

[0105] In some embodiments of the present invention, the color of the colorant included in the first sub-pattern (20a) may be different from the color of the colorant included in the second sub-pattern (20b). According to some embodiments of the present invention, by adjusting the color of the colorant included in the first sub-pattern (20a) to be different from the color of the colorant included in the second sub-pattern (20b), an interior part having an attractive appearance and various colors can be effectively implemented by combining positions corresponding to the emboss pattern and positions not corresponding to the emboss pattern.

[0106] In some other embodiments of the present invention, the printed pattern (20) may be formed at a position corresponding to the above-described micro-pattern. According to some embodiments of the present invention, since the printed pattern is formed at a position corresponding to the micro-pattern, appearance defects on the surface of the injection-molded product can be effectively minimized. For example, the printed pattern (20) may partially or completely fill the interior of the micro-pattern, and specifically, may completely fill it. For example, the printed pattern (20) may be a second sub-pattern.

[0107] Properties of interior parts

[0108] In some embodiments of the present invention, the gloss of the interior parts may be 2 to 50 GU (Gloss Unit), 3 to 49 GU, 3 to 20 GU, or 10 to 20 GU under measurement conditions of an incident angle of 60° in accordance with JIS Z8741. Here, the gloss is a physical quantity that evaluates the specular reflection ability of the material surface, and by adjusting it within the above numerical range, an interior part with easy gloss adjustment can be implemented, and the problem of the interior parts being excessively shiny can be effectively prevented. The measurement angle in the gloss measurement represents the angle between the incident light and the vertical, and is expressed as 20°, 60°, and 85°, and the standard gloss is generally measured at 60°. When measured at 60°, a value in the range of 10 to 70 GU is medium gloss, a value less than 10 GU is low gloss, and a value exceeding 70 GU is high gloss.

[0109] 2. Manufacturing method of interior parts

[0110] Figure 2 is a flow chart showing a method for manufacturing an interior part according to one embodiment of the present invention.

[0111] Referring to FIG. 2, according to another aspect of the present invention, a method for manufacturing an interior part is provided, including the steps of (S1) preparing an embossing mold, (S2) adjusting the gloss of the embossing mold, (S3) adding a raw material to an injection molding machine equipped with the embossing mold having the adjusted gloss to form an injection molded article having an embossing pattern, and (S4) transferring ink onto a surface of the injection molded article to form a printed pattern.

[0112] (S1) Step of preparing an embossing mold;

[0113] The method for manufacturing an interior component according to the present invention comprises the step (S1) of preparing an embossing mold. Specifically, through step (S1), an embossing mold having a shape corresponding to an embossing pattern is prepared, thereby enabling the final image to be realized to be formed.

[0114] For example, the above step (S1) may include a step of preparing an embossing mold so as to match the embossing pattern. Here, "matching" may mean an operation of forming an image of an interior part to be ultimately implemented through the embossing pattern formed on the mold.

[0115] For example, a laser or chemical etching method commonly used in the relevant technical field may be used as a method for forming the embossed mold, without any particular limitation. An embossed shape can be imparted to a general mold through the laser or chemical etching method.

[0116] (S2) A step of adjusting the gloss of the above embossing mold;

[0117] The method for manufacturing an interior part according to the present invention includes a step of adjusting the gloss of the embossing mold (S2) to improve the surface quality of the injection-molded product by adjusting the gloss of the embossing mold and to easily form a printed pattern on the surface of the injection-molded product.

[0118] For example, a method of spraying an abrasive commonly used in the relevant technical field onto the surface of the embossing mold can be used as a method for adjusting the gloss of the embossing mold.

[0119] In some embodiments of the present invention, the step (S2) may include a step of spraying an abrasive containing at least one of aluminum oxide and glass beads onto the surface of the embossing mold, and specifically, may include a step of spraying a mixed abrasive containing aluminum oxide and glass beads. According to some embodiments of the present invention, by spraying the mixed abrasive containing aluminum oxide and glass beads, the surface quality of the injection-molded product can be improved, and a printing pattern can be easily formed on the surface of the injection-molded product. Here, the aluminum oxide may be referred to as emery in the relevant technical field.

[0120] In some embodiments of the present invention, the weight ratio of the aluminum oxide and the glass beads (aluminum oxide: glass beads) may be 1:9 to 9:1, 2:8 to 8:2, 3:7 to 7:3, or 4:6 to 6:4. According to some embodiments of the present invention, by adjusting the weight ratio of the aluminum oxide and the glass beads within the above numerical range, the surface quality of the injection-molded product can be improved, and at the same time, a printed pattern can be easily formed on the surface of the injection-molded product.

[0121] (S3) A step of forming an injection molded product having an embossed pattern by adding raw materials to an injection molding machine equipped with an embossed mold having the above gloss adjusted;

[0122] The method for manufacturing an interior part according to the present invention comprises the step of (S3) adding a raw material to an injection molding machine equipped with an embossing mold with adjusted gloss to form an injection molded product having an embossing pattern on at least one surface.

[0123] For example, the injection molding machine is not particularly limited and may be a general injection molding machine commercially available in the relevant technical field.

[0124] The injection molding machine according to the present invention may include a hopper into which raw materials are fed.

[0125] The raw material according to the present invention may be a master batch for forming an injection molded product. Here, the master batch refers to a pellet-shaped raw material in which the basic plastic raw material and the additives to be added are concentrated and dispersed at a high concentration.

[0126] The description of the raw material overlaps with the description of the injection molded article, and will be briefly described. The raw material according to the present invention may include a plastic resin. Furthermore, the raw material may further include one or more selected from the group consisting of a filler, a first matting agent, a flame retardant, and a colorant.

[0127] In some embodiments of the present invention, the injection molding machine may further include a drying device connected to the hopper, capable of drying the raw material. For example, the drying device may be a heater commonly used in the relevant technical field.

[0128] In some other embodiments of the present invention, the injection molding machine may further include a moisture measuring device connected to the drying device and capable of measuring the moisture content of the raw material.

[0129] Meanwhile, the moisture content relative to the total weight of the raw material may be a factor affecting the appearance defects of the injection molded product.

[0130] In some embodiments of the present invention, in order to effectively conceal the appearance defects of the injection-molded product, the step (S3) may include a step of adjusting the moisture content to 0.4 wt% or less, 0.3 wt% or less, 0.2 wt% or less, or 0.1 wt% or less based on the total weight of the raw material. Specifically, when the moisture content is adjusted to 0.1 wt% or less based on the total weight of the raw material, the effect of effectively concealing the appearance defects of the injection-molded product can be implemented.

[0131] In some embodiments of the present invention, the step (S3) may include a step of drying the raw material fed into the hopper at 70°C or higher for 1 hour or longer. Specifically, the drying temperature may be 75°C or higher, 80°C or higher, or 85°C or higher, and the drying time may be 1 hour or longer, 2 hours or longer, or 3 hours or longer. According to some embodiments of the present invention, when the drying temperature is 85°C or higher and the drying time is 3 hours or longer, the moisture content of the raw material is lowered, thereby effectively concealing defects in the appearance of the injection-molded product.

[0132] For example, the drying device and / or moisture measuring device described above may be used as a method for controlling the moisture content.

[0133] (S4) A step of transferring ink onto the surface of the injection molded product to form a printing pattern.

[0134] The method for manufacturing an interior part according to the present invention includes the step of (S4) transferring ink onto the surface of the injection-molded product to form a printed pattern.

[0135] The pad printing printing process according to one embodiment of the present invention can have a higher resolution than the film / hydraulic transfer surface treatment method used for the surface treatment of existing automobile parts, which has limitations in improving the resolution (300 dpi level). According to one embodiment of the present invention, when the pad printing printing process is used, precise printing with a high resolution is possible, and the effect of excellent quality printing can be realized even in limited situations such as existing size restrictions, texture, or curved parts.

[0136] In Fig. 1a, the step (S4) may include a step of forming a printing pattern (20) by transferring ink (20i) to the surface of an injection-molded article (10) using a silicone pad (P). According to some embodiments of the present invention, by using a pad printing method using the silicone pad, ink can be transferred to the surface of an injection-molded article having various shapes due to the unique characteristics of the silicone pad. Specifically, the surface of an injection-molded article used in the automotive parts field may be non-flat. In this case, when a pad printing method using a silicone pad is used, precise printing work can be performed on the surface of the injection-molded article.

[0137] In some embodiments of the present invention, the ink (20i) may include a subject, a curing agent, a second matting agent, and a colorant. Here, the base resin may be a product formed by a reaction between the subject and the curing agent.

[0138] The subject matter of the present invention can transfer the material contained in the ink to the printing surface while simultaneously acting as a binder. For example, the subject matter may include a polyol, and more specifically, a polyester-based polyol.

[0139] The curing agent according to the present invention reacts with the subject matter to form a base resin, thereby inducing solidification of the transferred ink. For example, the curing agent may include an isocyanate-based compound, and more specifically, an aromatic isocyanate-based compound.

[0140] In some embodiments of the present invention, the ink may include more than 0 and less than 6 parts by weight, or 1 to 5 parts by weight, of a second matting agent relative to 100 parts by weight of the main body of the ink. According to some embodiments of the present invention, by adjusting the content of the second matting agent within the above numerical range, the glossiness of the interior part can be adjusted to an appropriate level while maintaining excellent adhesion of the printed pattern to the injection-molded article.

[0141] For example, the colorant included in the ink may be the same as or different from the colorant included in the above-described injection molding.

[0142] For example, the ink may further comprise one or more additives selected from the group consisting of diluents, antifoaming agents, dispersants, thickeners, and wetting agents commonly used in the art.

[0143] 3. Auto parts

[0144] According to another aspect of the present invention, an automotive component comprising an interior component of several embodiments is provided.

[0145] In this specification, “automobile” is not particularly limited and may be a four-wheeled vehicle commonly used in the relevant technical field, and specifically may be a passenger car, a passenger vehicle, a cargo vehicle, or a special vehicle.

[0146] For example, the automobile part may be, without particular limitation, an automobile interior material or an automobile exterior material. Specifically, the automobile part may be a cover, a headlight cover, an injection molded product for an interior screen, a bumper, a battery cover, a gasket, an insulation panel, an interior panel, a dashboard, a console box, a door trim, a cockpit, or a garnish product.

[0147] Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, this is merely an example, and the scope of the present invention is not limited by the following contents.

[0148] As used herein, terms such as "about" or "substantially" mean a reasonable amount of variation from the term that does not significantly alter the final result. These terms may be interpreted to include a variation of at least ±5% or at least ±10%, provided that such variation does not alter the meaning of the term and render it invalid.

[0149] [Manufacturing Preparation Example 1: Embossing Mold Manufacturing]

[0150] Manufacturing steps of an emboss mold with an embossed shape:

[0151] An embossed mold was manufactured by etching a plastic injection mold with a laser to form an emboss on the surface. At this time, the laser power was set to approximately 2 kW, the scan speed to approximately 0.4 mm / s, and the heat input to approximately 4000 J / mm. Meanwhile, during the manufacture of the embossed mold, the image to be finalized was formed by matching the printed pattern provided on the surface of the printed pattern.

[0152] Steps to adjust the gloss of the embossing mold:

[0153] A pretreatment step was performed to clean the surface of the above embossing mold and remove contaminants. On the surface of the above pretreated embossing mold, emery sand (D 50 =24 to 180 mesh) and glass beads in a weight ratio of 1:1 were mixed and sprayed using a blasting machine at approximately 6 bar to perform the blasting step. At this time, the gloss of the embossing mold can be controlled by adjusting the weight ratio of the embossing and glass beads.

[0154] [Manufacturing Preparation Example 2: Manufacturing Ink for Forming a Printing Pattern]

[0155] As described in Table 1 below, an ink containing a subject, a hardener, a diluent, and a matting agent was prepared. In this case, the content of each composition in Table 1 below is the relative content (unit: part by weight) relative to 100 parts by weight of the subject.

[0156] Classification (unit: parts by weight) Manufacturing Preparation Example 2-1 Manufacturing Preparation Example 2-2 Manufacturing Preparation Example 2-3 Manufacturing Preparation Example 2-4 Manufacturing Preparation Example 2-5 Manufacturing Preparation Example 2-6 Manufacturing Preparation Example 2-7 Topic 1) 100100100100100100100 Hardener 2) 30303030303030 Diluent 3) 45454545454545Second quencher 4) 0123456 Colorant 5) 01.252.53.7556.257.611) Polyester polyol with a number average molecular weight of 2,000 g / mol2) Curing agent containing m-Tolilidene diisocyanate (SC 1000H-GL from Sericom Italia Srl)3) Diluent A from Sericom Italia Srl4) Moisture content of 3.5 wt%, oil absorption of 230 ml / 100 g, and average particle size (D 50 ) is 1.7㎛ and the BET surface area is 150m 2 / g Silica 5) Gray Pigment: Final Fantasy 14 Inven

[0157] [Manufacturing Example 1: Manufacturing of Interior Parts] <Comparative Example 1: Interior Parts Including a Paint Layer>

[0158] Injection molding manufacturing steps:

[0159] 100 parts by weight of ABS (Acrylonitrile butadiene styrene copolymer) having a MFR (Melt flow rate) of 6.5 g / 10 min and a weight average molecular weight of 100,000 g / mol, 10 parts by weight of filler (CaCO3), a matting agent (having a moisture content of 3.5 wt%, an oil absorption of 230 ml / 100 g, and an average particle size (D 50 ) is 1.7㎛ and the BET surface area is 150m 2 A master batch (pellet form) was prepared consisting of 2 parts by weight of silica ( / g), 1 part by weight of halogen-based flame retardant, and 1 part by weight of heat stabilizer (Ca / Zn-based).

[0160] The above masterbatch (raw material) was placed into a hopper equipped with an injection molding machine. At this time, the hopper is equipped with a drying device (e.g., a hopper dryer) to dry the raw material. Accordingly, the moisture content of the raw material can be controlled and measured.

[0161] The above dried raw material is put into a cylinder at 240℃, and the injection pressure is 1000 kg / cm in the first stage. 2 , 400 kg / cm in the second 2 , the screw rotation speed was adjusted to 80 RPM and the injection time was adjusted to 10 seconds to produce a melt.

[0162] After the above melt was poured into a mold set to 85°C, an injection molded product having a shape corresponding to the shape of the mold was manufactured. At this time, a general mold without an embossed shape was used as the mold of Comparative Example 1.

[0163] Paint layer formation steps:

[0164] A paint layer was formed by applying black paint to the surface of the above-mentioned injection product.

[0165] Print pattern formation steps:

[0166] A printing pattern was formed on one side of the above-mentioned coating layer using a silicone pad with the ink of the above-mentioned manufacturing preparation example 2-2. At this time, the pressure for forming the printing pattern was 5 kgf / cm. 2 was adjusted to .

[0167] <Examples 1 to 7: Manufacturing of interior parts including printed patterns with omitted paint layers>

[0168] Injection molding manufacturing steps:

[0169] 100 parts by weight of ABS (Acrylonitrile butadiene styrene copolymer) having an MFR (Melt flow rate) of 6.5 g / 10 min and a weight average molecular weight of 100,000 g / mol, and an average particle diameter (D 50 ) 10 parts by weight of filler (plate-shaped CaCO3) having a particle size of 1.0 ㎛, a first matting agent (having a moisture content of 3.5 wt%, an oil absorption of 230 ml / 100 g, and an average particle size (D 50 ) is 1.7㎛ and the BET surface area is 150 m 2 A master batch (pellet form) was prepared consisting of 2 parts by weight of silica ( / g), 1 part by weight of a halogen flame retardant, 1 part by weight of a colorant (carbon black), and 1 part by weight of a heat stabilizer (Ca / Zn).

[0170] The above master batch (raw material) was placed into a hopper equipped with an injection molding machine. At this time, the hopper is equipped with a drying device (e.g., a hopper dryer) capable of controlling and measuring the moisture content of the raw material. Using the drying device, the raw material was dried at 85°C for 3 hours.

[0171] The above dried raw material is put into a cylinder at 240℃, and the injection pressure is 1000 kg / cm in the first stage. 2 , 400 kg / cm in the second 2 , the screw rotation speed was adjusted to 80 RPM and the injection time was adjusted to 10 seconds to produce a melt.

[0172] The above melt was poured into the embossing mold of Manufacturing Preparation Example 1 set at 85°C and cooled, and then an injection molded product having a shape corresponding to the shape of the mold was manufactured. At this time, an embossing pattern was provided on the surface of the injection molded product. Here, the depth (height) (H1) of the embossing pattern was adjusted to 170 μm.

[0173] Print pattern formation steps:

[0174] Each ink of Manufacturing Preparation Examples 2-1 to 2-7 was transferred to a location corresponding to the embossed pattern of the injection molded product and a location not corresponding to the embossed pattern to form a printed pattern, respectively. At this time, a method of transferring the ink using a silicone pad was used. The average thickness (height) of the first sub-pattern formed at a location corresponding to the embossed pattern in the printed pattern was adjusted to 10 μm.

[0175] As a result, interior parts of Examples 1 to 7 without a paint layer were each manufactured.

[0176] [Experimental Example 1: Micrographs of Comparative Example 1 and Example 1]

[0177] Fig. 3a is an actual photograph of an interior part according to Comparative Example 1, Fig. 3b is an optical microscope photograph (x300) of point 1 shown in Fig. 3a, and Fig. 3c is an optical microscope photograph (x300) of point 2 shown in Fig. 3a.

[0178] Fig. 4a is an actual photograph of an interior part according to Example 1, Fig. 4b is an optical microscope photograph (x300) of point 1 shown in Fig. 4a, and Fig. 4c is an optical microscope photograph (x300) of point 2 shown in Fig. 4a.

[0179] Referring to FIGS. 3a to 3c and 4a to 4c, it was confirmed that the interior part according to Example 1 did not have a paint layer, unlike the interior part according to Comparative Example 1.

[0180] [Experimental Example 2: Evaluation of the Gloss of Interior Parts and the Adhesion of Printed Patterns to Injection Molded Products]

[0181] For each interior part according to Examples 1 to 7 above, the gloss and the adhesion of the printed pattern to the injection-molded product were evaluated using the following method.

[0182] How to measure gloss:

[0183] In accordance with JIS Z8741, the gloss of the interior parts according to Examples 1 to 7 was measured at an incident angle of 60° using a handy gloss meter PG-1 from Nippon Denshoku Kogyo Co., Ltd. (Unit: GU = Gloss Unit).

[0184] Adhesion of printed patterns to injection molded articles:

[0185] For 20 experts in the field of interior components, if the printed pattern completely lifts off the surface of the injection-molded product, it is evaluated as “poor”, and if the printed pattern does not lift off the surface of the injection-molded product, it is evaluated as “excellent.”

[0186] Distinctive ink Subject 100 parts by weight of the second matting agent content (parts by weight) Based on the total weight of the printed pattern 2nd matting agent content (% by weight) Gloss (GU) of interior parts Adhesion of printed pattern to injection molded article Example 1 Preparation for manufacturing Example 2 - 100.4 wt% 50 (excessive transparency problem occurs) Excellent Example 2 Preparation for manufacturing Example 2 - 10.9 wt% 20 (gloss between semi-gloss and matte) Excellent Example 3 Preparation for manufacturing Example 2 - 3 21.3 wt% 15 (gloss between semi-gloss and matte) Excellent Example 4 Preparation for manufacturing Example 2 - 4 31.8 wt% 10 (between semi-gloss and matte) Glossy) Excellent Example 5 Manufacturing Preparation Example 2-5 42.2 wt% 3 (completely matte) Excellent Example 6 Manufacturing Preparation Example 2-6 52.7 wt% 3 (completely matte) Excellent Example 7 Manufacturing Preparation Example 2-7 63.1 wt% 2 Inferior

[0187] Referring to Table 2 above, it was confirmed that the content of the matting agent relative to the total weight of the printed pattern is a factor that simultaneously affects the glossiness of the interior part and the adhesion of the printed pattern to the injection-molded article. Specifically, Example 1, which has a printed pattern that does not include a matting agent, showed excellent adhesion of the printed pattern to the injection-molded article, but showed a problem in that the glossiness of the interior part was not easily controlled because the matting agent was not included. This caused a problem in that the glossiness of the interior part was excessively high, causing the background to be excessively transparent. In addition, Example 7, in which the content of the matting agent relative to the total weight of the printed pattern was excessively added, showed a problem in that the adhesion of the printed pattern to the injection-molded article was reduced.

[0188] On the other hand, in the case of interior parts according to Examples 2 to 6, it was confirmed that the gloss of the interior parts could be effectively controlled by adjusting the content of the matting agent to 0.9 to 2.7 wt% based on the total weight of the printed pattern, and at the same time, the adhesion of the printed pattern to the injection-molded product was excellent.

[0189] [Manufacturing Example 2: Manufacturing of interior parts using different drying conditions for raw materials]

[0190] <Examples 8 to 10: Manufacturing of interior parts with controlled moisture content of raw materials>

[0191] Interior parts were manufactured using the same method as Example 3, but the moisture content based on the total weight of the raw materials was adjusted to the values ​​shown in Table 3 below to manufacture interior parts of Examples 8 to 10, respectively.

[0192] <Comparative Example 2: Unlike Example 3, when the printing pattern formation step is omitted>

[0193] An interior part was manufactured in the same manner as Example 3, but the step of forming the printing pattern was omitted.

[0194] [Experimental Example 3: Evaluation of Injection Molding Appearance Defect Concealment]

[0195] Twenty experts in the field of interior parts were asked to evaluate defects (gas, shrinkage, foreign matter, surface scratches) appearing on the surface of the injection-molded interior parts according to Comparative Examples 1 and 2, Example 3, and Examples 8 to 10. Unit area of ​​the injection-molded product was 10 cm. 2 If there is 1 or less defect, it is evaluated as “Defect X”, if there is 1 or more but 5 or fewer defects, it is evaluated as “Defect △”, and if there are more than 5 defects, it is evaluated as “Defect O”.

[0196] Classification Mold injection molding printing pattern Raw material moisture content (% by weight) Drying time (hour) Drying temperature (℃) Appearance Defect presence Comparative example 1 General mold Embo pattern X O 0.1 weight% or less 3 hours 85 Defect O Comparative example 2 Embo mold Embo pattern OX 0.1 weight% or less 3 hours 85 Defect O Example 3 Embo mold Embo pattern OO 0.1 weight% or less 3 hours 85 Defect X Example 8 Embo mold Embo pattern OO More than 0.1 weight% 0.2 weight% or less 1.5 hours 85 Defect △ Example 9 Embo mold Embo pattern OO More than 0.2 weight% 0.3 weight% or less Less than 1 hour 85 Defect △ Example 10 Embo mold Embo pattern OO 0.4 weight% Undried Room temperature Defect O

[0197] Referring to Table 3 above, it was confirmed that the combination of an embossing mold capable of forming an embossing pattern on the surface of an injection-molded product and a moisture content relative to the raw material affects the effect of concealing the appearance defects of the injection-molded product. Specifically, in the case of Comparative Example 1, although the moisture content relative to the raw material was at an appropriate level, a general mold was used, and if an embossing pattern was not formed on the surface of the injection-molded product, a problem occurred in which numerous defects were observed.

[0198] In addition, in the case of Comparative Example 2, unlike Example 3, since a printing pattern was not provided, there was a problem in that the appearance defects formed on the surface of the injection molded product during the injection molding process could not be effectively concealed.

[0199] Comparing Examples 3 and 8 to 10, it was confirmed that even when the same embossing mold was used, when the moisture content compared to the raw material was 0.1 wt% or less, the effect of further minimizing appearance defects was confirmed.

[0200] [Experimental Example 4: Optical microscope photographs of interior components according to Example 3]

[0201] FIG. 5 is an optical microscope photograph (x300) showing the front and back sides of an injection-molded product in a walnut wood grain product and an ash wood grain product of an interior part according to Example 3.

[0202] Referring to Fig. 5, it was confirmed that a non-embossed area and an embossed area were formed on the front side of the injection molded product according to Example 3. On the other hand, no embossed area was observed on the back side of the injection molded product.

[0203] [Manufacturing Example 3: Manufacturing interior parts according to injection molding pattern]

[0204] <Examples 3-1 to 3-3: Interior parts without a paint layer>

[0205] An interior part was manufactured using the same method as in Example 3, but when manufacturing the embossing mold of Manufacturing Preparation Example 1, the laser etching process factors were adjusted so that an engineered wood texture, a fabric texture, or a stone texture was implemented on the surface of the injection-molded product, thereby forming an embossing pattern on the surface of the injection-molded product. At this time, the injection-molded product in the interior part of Example 3-1 had an engineered wood texture, the injection-molded product in the interior part of Example 3-2 had a fabric texture, and the injection-molded product in the interior part of Example 3-3 had a stone texture.

[0206] <Comparative Examples 3-1 to 3-3: Control group of interior parts including a paint layer>

[0207] For each control group of Examples 3-1 to 3-3, a control group of interior parts including a paint layer was manufactured in the same manner as Comparative Example 1, but the same injection molded material as the injection molded material of the interior parts according to Examples 3-1 to 3-3 was used.

[0208] [Experimental Example 5: Surface Roughness Measurement of Interior Parts]

[0209] Using a 3D shape analysis measuring device (equipment name: KEYENCE VR-6000), the 10-point mean roughness (Rz) and maximum height of surface (Sz) of the surface roughness of the interior parts were measured, and the results are shown in Table 4 below.

[0210] Afterwards, parameters regarding the rate of change in surface roughness (Rz) of the interior parts of Examples 3-1 to 3-3 compared to the control group of interior parts of Comparative Examples 3-1 to 3-3 were calculated according to the following Equation 1.

[0211] [Formula 1]

[0212] P=[|(P f -P i )| / (P i )] X 100

[0213] In the above equation 1, P represents the rate of change in the 10-point average roughness of the interior parts, and P i is the 10-point mean roughness (Rz) of the interior part control group including a paint layer between the injection molded product and the printed pattern, and P f is the ten-point mean roughness (Rz) of the interior parts, and |(P f -P i )|is (P f -P i ) means the absolute value of.

[0214] Presence or absence of a coating layer Injection molded pattern interior parts Surface roughness 10-point average roughness change rate (P, %) Presence of appearance defects Rz (㎛) Sz (㎛) Comparative example 3-1O Engineered wood texture 144.52 ㎛ 335.40 ㎛ - Defect O Example 3-1X Engineered wood texture 104.19 ㎛ 253.47 ㎛ 27.90% Defect X Comparative example 3-2O Fabric texture 195.25 ㎛ 423.60 ㎛ - Defect O Example 3-2X Fabric texture 292.22 ㎛ 573.00 ㎛ 49.66% Defect X Comparative example 3-3O Stone texture 154.09 ㎛ 446.77 ㎛ Defect O Example 3-3X Stone texture 281.90 ㎛ 638.60 ㎛ 82.94% Defect X

[0215] Referring to Table 4 above, it was confirmed that the surface roughness of the interior parts varies depending on the injection molding pattern. Specifically, when the P of the interior parts according to Examples 3-1 to 3-3 satisfies 20 to 85%, it was confirmed that the appearance defects formed on the surface of the injection molding product during the injection molding process were effectively concealed, thereby further minimizing the appearance defects. The features described in one embodiment described above can be combined with other embodiments unless the contrary description is explicitly stated. In addition, although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0216] [Explanation of symbols]

[0217] 10: Injection

[0218] 12: Embossed pattern

[0219] 20: Print pattern

[0220] 20a: First sub-pattern

[0221] 20b: Second sub-pattern

[0222] 20i: Ink

[0223] P: Silicone pad

Claims

1. An injection-molded article having an embossed pattern on at least one side; and A printed pattern in contact with the above-mentioned injection product; Interior parts.

2. In paragraph 1, The above injection molded product comprises a plastic resin, Interior parts.

3. In paragraph 2, The above injection product is, Further comprising at least one selected from the group consisting of fillers, first matting agents, flame retardants, and colorants. Interior parts.

4. In paragraph 3, The content of the first quencher is 0.01 to 10 parts by weight based on 100 parts by weight of the plastic resin. Interior parts.

5. In paragraph 1, The above printing pattern is, A first sub-pattern formed at a position corresponding to the above embossed pattern, A second sub-pattern formed at a location that does not correspond to the above embossed pattern, and comprising any one selected from the group consisting of combinations of these; Interior parts.

6. In paragraph 5, The average thickness of the first sub-pattern is 4 to 20 ㎛, Interior parts.

7. In paragraph 1, The above printed pattern includes a second matting agent, Based on the total weight of the above printed pattern, the content of the second matting agent is 0.1 to 3.1 wt%. Interior parts.

8. In paragraph 7, The above-mentioned injection product comprises a first quencher, The weight ratio of the first quencher and the second quencher is 1:0.5 to 1:1, Interior parts.

9. In paragraph 1, In accordance with JIS Z8741, the gloss of the interior parts is 2 to 50 GU under measurement conditions of an incident angle of 60°. Interior parts.

10. In paragraph 1, At least one side of the above-mentioned injection product, Including further microscopic micropatterns that can be confirmed with an optical microscope at a magnification of 300x or more, Interior parts.

11. In paragraph 1, P calculated according to the following formula 1 is 20 to 85%, Interior Parts: [Formula 1] P=[|(P f -P i )| / (P i )] X 100 In the above equation 1: P represents the rate of change in the 10-point average roughness of the interior parts, P i is the 10-point mean roughness (Rz) of the interior part control group that further includes a paint layer between the injection molded product and the printed pattern, P f is the 10-point mean roughness (Rz) of the above interior parts, |(P f -P i )|is (P f -P i ) means the absolute value of. 12.(S1) Step of preparing an embossing mold; (S2) A step of adjusting the gloss of the above embossing mold; (S3) A step of forming an injection molded product having an embossed pattern by adding raw materials to an injection molding machine equipped with an embossed mold having the above gloss adjusted; and (S4) A step of forming a printing pattern by transferring ink on the surface of the injection molded product; including; Method of manufacturing interior parts.

13. In paragraph 12, The above step (S2) is, A step of spraying an abrasive containing at least one of aluminum oxide and glass beads onto the surface of the embossing mold, Method of manufacturing interior parts.

14. In paragraph 13, The weight ratio of the above aluminum oxide and the above glass beads is 1:9 to 9:1, Method of manufacturing interior parts.

15. In paragraph 12, The above step (S3) is, Comprising a step of adjusting the moisture content to 0.4 wt% or less based on the total weight of the above raw materials, Method of manufacturing interior parts.

16. In paragraph 12, The above ink, Containing 0 to 6 parts by weight of a second matting agent relative to 100 parts by weight of the subject matter of the ink, Method of manufacturing interior parts.

17. In paragraph 12, The above step (S4) is, Comprising a step of forming the printing pattern by a pad printing method, Method of manufacturing interior parts.

18. An automobile part comprising an interior part according to any one of paragraphs 1 to 11.

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