JP2001310350A - Method for manufacturing in-mold-decorated molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for easily manufacturing an in-mold-decorated molded article having excellent appearance without generating wrinkles or damage in a decorative sheet by sufficiently filling a cavity with a resin. SOLUTION: In the method for manufacturing the in-mold-decorated molded article by arranging the decorative sheet in the cavity of a mold and injecting a molten resin based on a propylene resin in the mold to integrate the same with the decorative sheet, the relation of 0.1<=b/a<=100 is satisfied between the gate diameter a (mm) of the mold and the melt flow rate b (g/10 min) based on the propylene resin under the condition of a test temperature of 230 deg.C and a nominal load of 2.16 kg in the melt flow rate test method prescribed in (JIS) K7210.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a simultaneously-decorated molded article having an excellent appearance in which a cavity is sufficiently filled with a resin and a decorative sheet is not wrinkled or damaged.

[0002]

2. Description of the Related Art Conventionally, as a method of decorating the surface of a resin molded product, there is a simultaneous decorating method using a decorative sheet.
The simultaneous molding and decorating method includes a simultaneous molding and transferring method using a transfer material as a decorative sheet and an insert method using an insert material as a decorative sheet.

In the simultaneous molding transfer method, a transfer material having a transfer layer formed of a release layer, a pattern layer, an adhesive layer, etc. formed on a base sheet is sandwiched in a molding die, and a molten resin is injected into the die. This is a method in which, after cooling to obtain a resin molded product, a transfer material is adhered to the surface of the molded product, the base sheet is peeled off, and the transfer layer is transferred to the surface of the object to be transferred, thereby performing decoration.

[0004] In the insert method, an insert material in which a pattern layer or the like is formed on a base sheet is sandwiched in a molding die, a molten resin is injected into the die, and cooled to obtain a resin molded product. This is a method of decorating by bonding an insert material to the surface of a molded product.

[0005] The simultaneous molding transfer method and the insert method have a feature that a pattern can be formed even in a molded article having a shape in which it is difficult to directly form a pattern by a printing method.

[0006]

However, in these simultaneous molding and decorating methods, there is a problem that when the molten resin is injected, the decorative sheet is wrinkled or partially damaged. Was.

That is, there is a pin point gate as a gate of a molding die. The use of a molding die having a pinpoint gate has the advantages that the gate marks on the molded product are small and inconspicuous, and the runner can be easily removed from the molded product. However, about 1 in the cylinder
The high-temperature molten resin heated to 80 to 260 ° C. flows through a small-diameter gate portion such as a pinpoint gate to generate frictional heat at the gate portion, thereby further increasing the temperature. By suddenly hitting the decorative sheet installed in the molding die with high pressure,
The decorative sheet may be wrinkled, or the adhesive layer, the design layer, the base sheet, and the like that constitute the decorative sheet may be partially melted and scattered. In addition, if the gate diameter is small, the flow rate of the resin is hindered and the resin does not flow to the end of the molded product, and it is necessary to inject the resin with a higher pressure, so that the decorative sheet is more wrinkled or damaged. There was a problem that it was easy to do.

Further, as other gate types, there are a side gate, a film gate, and the like that require a gate treatment after molding but can inject a large amount of molten resin. When a molding die having such a relatively large gate diameter is used,
The high-temperature molten resin heated to 180 to 260 ° C. in the cylinder will flow into the cavity at once in a large amount, and the decorative sheet will wrinkle or the adhesive layer of the decorative sheet will be heated by the amount of heat of the molten resin. There has been a problem that the decorative sheet cannot be adhered to the molding resin due to being melted and flown, or the decorative sheet itself is damaged by the heat of the molten resin.

As described above, the adhesive layer, the pattern layer, the base sheet, etc. of the decorative sheet are damaged by the heat and pressure of the molten resin at the time of injection, resulting in poor adhesion, flow of the pattern, wrinkling of the decorative sheet, melting of the decorative sheet. And the like, and there is a problem that a defect occurs in the appearance of the simultaneously decorated decorative molded product.

[0010] Accordingly, the present invention is to provide a simultaneously-decorated molded article having an excellent appearance in which the above-mentioned drawbacks are eliminated, the cavity is sufficiently filled with resin, and the decorative sheet does not suffer from wrinkling or damage. It is an object to provide a method for easily manufacturing.

[0011]

Means for Solving the Problems In order to achieve the above object, the method for producing a simultaneously decorated decorative molded article according to the present invention is constituted as follows.

That is, according to the method for producing a simultaneously decorated decorative molded article of the present invention, a decorative sheet is placed in a mold having a cavity, and a molten resin mainly composed of a propylene-based resin is injected into the mold. In a method for producing a molded article at the same time as a molded article in which a decorative sheet and a resin are integrated, a gate diameter of a mold is a (mm), and a Japanese Industrial Standard (JIS) K7
The melt flow rate of a resin containing a propylene-based resin as a main component at a test temperature of 230 ° C. and a nominal load of 2.16 kg in the melt flow rate test method specified in 210 is b
(G / 10 min), 0.1 ≦ b / a ≦ 10
The configuration is such that the relationship of 0 is established.

In the above invention, the propylene-based resin as the main component is a propylene-based resin alone, a polymer alloy of polypropylene and an olefin-based rubber,
It may be configured to be at least one of a polymer alloy of polypropylene and a thermoplastic elastomer.

In the above invention, the gate may be configured as a pinpoint gate.

Further, in the above invention, the temperature of the molten resin containing a propylene-based resin as a main component is 180 to 260 ° C.
May be configured.

In the above invention, the decorative sheet may be constituted by a transfer material or an insert material.

Further, in the above invention, the decorative sheet is an insert material, and the material of the base sheet constituting the insert material is polyolefin.
S) The melt flow rate of the base sheet at a test temperature of 230 ° C. and a nominal load of 2.16 kg in the melt flow rate test method specified in K7210 is c (g / 10 mi).
When n), the relationship of 0.5 ≦ c ≦ 30 may be established.

In the above invention, the decorative sheet is an insert material, the base sheet and the backing sheet constituting the insert material are polyolefin, and the melt flow rate specified in Japanese Industrial Standards (JIS) K7210. When the melt flow rate of the base sheet and the backing sheet at a test temperature of 230 ° C. and a nominal load of 2.16 kg in the test method is c (g / 10 min), a relationship of 0.5 ≦ c ≦ 30 is established. May be.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail.

[0020] In the method for manufacturing a simultaneously-decorated molded article according to the present invention, a decorative sheet is placed in a mold having a cavity,
Injection of a molten resin containing a propylene-based resin as a main component into a mold to obtain a molded article in which the decorative sheet and the resin are integrated. (Mm), the test temperature 230 in the melt flow rate test method specified in Japanese Industrial Standard (JIS) K7210
The melt flow rate of a resin containing a propylene resin as a main component at a nominal load of 2.16 kg at b.
min), a relationship of 0.1 ≦ b / a ≦ 100 is established.

When the decorative sheet is supplied by the decorative sheet feeding device attached to the movable mold, or when the decorative sheet is larger than the cavity area, the mold has a sleep rate type molding mold structure. Is preferred. When the decorative sheet is smaller than or approximately equal to the cavity area, the present invention can be applied to a two-plate molding die structure.

In the present invention, a gate is a port through which a resin melted in a cylinder of a molding machine is injected into a cavity in a mold from a nozzle and flows into the cavity directly or through a runner, a sprue or the like in the mold. The part which becomes. Gates are classified into pinpoint gates, side gates, film gates, and the like, depending on the shape and the position of the gate. The pinpoint gate is
It is usually circular, in which case the gate diameter refers to the diameter of the gate. In addition, even if a pinpoint gate has an elliptical or other deformed shape for some reason, or if the shape of a gate such as a side gate or a film gate is not circular, the average of the minimum inner diameter and the maximum outer diameter of the gate is averaged. Is the diameter. When the shape of the gate is rectangular, the diameter is defined as the average of the diagonal line and the short side. When there are multiple gates, the average of the gate diameters is used as the gate diameter. In the case of a pinpoint gate, the gate diameter a is 0.
Preferably it is in the range of 8 to 2.5 mm. If the gate diameter is less than 0.8 mm, the flow of the molten resin will worsen,
Applying high pressure tends to damage the decorative sheet. When the gate diameter a exceeds 2.5 mm, the decorative sheet is easily melted by the heat of the molten resin.

In particular, the gate is preferably a pinpoint gate. When the pinpoint gate is employed, the gate trace of the simultaneously-decorated molded product is small and inconspicuous, and when the mold is opened, the runner can be automatically removed from the simultaneously-decorated molded product.

As the molten resin, a resin containing a propylene resin as a main component is used.

The resin containing a propylene-based resin as a main component is
After being formed into a molded product, it has high physical properties such as solvent resistance and chemical resistance, and has a lower specific gravity than other thermoplastic resins, which is useful for reducing the weight of the product. The use of the simultaneous decorating method in which the decorative sheet is integrated with the decorative sheet in the mold has advantages such as obtaining a molded article having excellent adhesion between the molding resin and the decorative sheet. In the present invention, the term “main component” means that the content is 51% by weight or more as a component of the resin.

The resin containing a propylene-based resin as a main component is
It is preferably at least one of a propylene-based resin alone, a polymer alloy of a propylene-based resin alone and an olefin-based rubber, and a polymer alloy of a propylene-based resin alone and a thermoplastic elastomer.

As the propylene resin alone, polypropylene, a propylene / ethylene random copolymer, a propylene / ethylene block copolymer, or the like may be used. Further, as the polymer alloy of the propylene-based resin alone and the olefin-based rubber, the above-mentioned propylene-based resin alone, ethylene / propylene copolymer rubber (EPM), ethylene / butene copolymer rubber (EBM), ethylene / propylene / non-polymer When using a polymer alloy with an olefin-based rubber such as conjugated diene copolymer rubber (EPDM), ethylene-propylene-butene copolymer rubber, styrene-butadiene copolymer rubber (SBR), styrene-isoprene copolymer rubber, butadiene rubber, etc. Good. Further, as the polymer alloy of the propylene resin alone and the thermoplastic elastomer, the propylene resin alone, a styrene / butadiene block copolymer or a hydrogenated product thereof (hydrogenated SIS), styrene / ethylene / propylene / Styrene copolymer (SEPS), styrene / butadiene /
Hydrogenated product of isoprene block copolymer (hydrogenated SB
A polymer alloy with a thermoplastic elastomer such as IS) may be used.

As additives, fillers such as talc, calcium carbonate and mica, and short fibers such as glass fiber and carbon fiber can be contained as fillers. Also, plasticizers such as paraffin oil, antioxidants, heat stabilizers, light stabilizers, ultraviolet absorbers, neutralizers, lubricants, lubricants, antiblocking agents, slip agents, dispersants, antistatic agents, antifogging Agents, antibacterial agents and the like, and pigments and the like as colorants. However, many of these additives work in the direction of deteriorating (reducing) the melt flow and cause wrinkles in the simultaneous decorative molding method. Therefore, it is preferable to keep the additive amount as small as possible.

The melt flow rate b of the resin containing a propylene-based resin as a main component, which is melted and injected into a mold, is preferably 2.0 to 80. Melt flow rate (MFR) is also referred to as melt index (MI) and is an index of the ease of resin flow. When it is in a molten state in a mold, it can be determined that the larger the value, the easier the flow.

The melt flow rate is JIS K721
It can be measured by the melt flow rate test method specified by 0 and expresses the amount of resin extruded from the orifice at a constant temperature and pressure by using an extrusion type plastometer in terms of grams per 10 minutes. , G
It is a numerical value indicated in units of / 10 min.

In general, a resin having a low melt flow rate has a poor fluidity, and when used in the simultaneous molding and decorating method, the decorative sheet is easily stretched due to a high temperature. As a result, the decorative sheet is elongated by friction, and the decorative sheet tends to be excessively wrinkled at the end face of the mold.

Here, when the gate diameter of the mold is a (mm) and the melt flow rate of the resin mainly composed of polypropylene resin is b (g / 10 min), 0.1 ≦ b /
It is important that the relationship a ≦ 100 holds. That is, when the high-temperature molten resin is injected and filled into the cavity, the decorative sheet mounted in the molding die may be wrinkled or damaged. I found that it depends on ease. In particular,
When a resin containing polypropylene as a main component is melted in a cylinder and injected at a temperature of 180 to 260 ° C., the flow rate at which the molten resin is injected depends on the gate diameter, and the flow rate in the cavity flows through the cavity. It turned out that it depends on the ease of resin flow.

More specifically, the gate diameter a (m
m), the melt flow rate b (g / 10 min) of the resin containing a propylene-based resin as a main component at 230 ° C. and a nominal load of 2.16 kg according to the melt flow rate test method specified in JIS K7210 satisfies the above relationship. Thus, the decorative sheet does not wrinkle or be damaged by the pressure or heat of the molten resin. When b / a is less than 0.1, the flow of the molten resin is deteriorated, and when a high pressure is applied, the decorative sheet may be wrinkled or damaged. On the other hand, when b / a exceeds 100, the decorative sheet may be wrinkled or melted due to the heat of the molten resin.

In particular, when the gate is a pinpoint gate, it is preferable that 0.8 ≦ b / a ≦ 100. If b / a is less than 0.8, the flow of the molten resin becomes worse, and if a high pressure is applied, the decorative sheet is damaged. When b / a exceeds 100,
There is a disadvantage that the decorative sheet is melted by the calorific value of the molten resin.

In general, the distance between the decorative sheet and the gate is preferably not close to the decorative sheet.

The temperature of the molten resin containing polypropylene as a main component is preferably from 180 to 260 ° C. If the temperature of the molten resin is lower than 180 ° C., the flow of the molten resin is deteriorated, and there is a possibility that a short-circuit may occur in the molded product or a poor adhesion of the decorative sheet may occur. If the temperature of the molten resin exceeds 260 ° C., the resin may be burnt and the molded product may be colored, or carbonized, and the resin residue may remain in the cylinder. Further, the decorative sheet may be melted. The molten resin is melted in a cylinder, and is generally 10 ° C higher than the temperature indicated by the nozzle of the injection molding machine.
高 い 40 ° C. higher. Then, when the molten resin is injected into the mold via the nozzle, it is considered that there is a temperature drop of about 10 to 40 ° C. Therefore, the nozzle indicated temperature of the injection molding machine may be regarded as indicating the molten resin temperature immediately before the injection.

As the decorative sheet, a transfer material or an insert material can be used.

The transfer material has a base sheet provided with a transfer layer comprising a release layer, a design layer, an adhesive layer and the like.

As a material of the base sheet, it is used as a base sheet of a usual transfer material such as a resin sheet of polypropylene resin, polyethylene resin, polyamide resin, polyester resin, acrylic resin, polyvinyl chloride resin and the like. Things can be used. When the surface of the base sheet has fine irregularities, the irregularities are transferred to the transfer layer, so that the surface shape such as matting or hair alignment can be expressed.

When the transfer layer has good releasability from the base sheet, the transfer layer may be provided directly on the base sheet. In order to improve the releasability of the transfer layer from the base sheet, a release layer may be formed over the entire surface before providing the transfer layer on the base sheet.

The release layer is formed entirely on the base sheet or the release layer. The release layer is a layer that is peeled from the base sheet or the release layer and becomes the outermost surface of the transferred object when the base sheet is peeled off after the simultaneous transfer of molding. Examples of the material of the release layer include acrylic resin, polyester resin, polyvinyl chloride resin, cellulose resin, rubber resin, polyurethane resin, polyvinyl acetate resin, and the like, as well as vinyl chloride-vinyl acetate copolymer. It is preferable to use a resin or a copolymer such as an ethylene-vinyl acetate copolymer resin.
When the release layer requires hardness, a photocurable resin such as an ultraviolet curable resin, a radiation curable resin such as an electron beam curable resin, or a thermosetting resin may be selected and used. The release layer may be colored or uncolored. As a method for forming the release layer, there are a coating method such as a gravure coating method, a roll coating method, and a comma coating method, and a printing method such as a gravure printing method and a screen printing method.

The design layer is usually formed on the release layer as a printing layer. As a material of the printing layer, a resin such as a polyvinyl resin, a polyamide resin, a polyester resin, an acrylic resin, a polyurethane resin, a polyvinyl acetal resin, a polyester urethane resin, a cellulose ester resin, and an alkyd resin is used as a binder. ,
It is preferable to use a coloring ink containing a pigment or dye of an appropriate color as a coloring agent. As a method for forming the printing layer, a normal printing method such as an offset printing method, a gravure printing method, or a screen printing method may be used. The printing layer may be provided entirely or partially depending on the design to be expressed.

The design layer may be composed of a metal thin film layer or a combination of a printing layer and a metal thin film layer. The metal thin film layer is for expressing metallic luster as a design layer, and is formed by a vacuum deposition method, a sputtering method, an ion plating method, a plating method, or the like. Depending on the metallic gloss color you want to express, aluminum,
Metals such as nickel, gold, platinum, chromium, iron, copper, tin, indium, silver, titanium, lead, and zinc, and alloys or compounds thereof are used. The metal thin film layer may be partially formed. When providing the metal thin film layer, a front anchor layer or a rear anchor layer may be provided in order to improve the adhesion between another transfer layer and the metal thin film layer.

The adhesive layer is for bonding each of the above-mentioned layers on an object to be transferred. As the adhesive layer, a heat-sensitive or pressure-sensitive resin suitable for bonding with a resin containing polypropylene as a main component is appropriately used. For example, polypropylene resin alone, chlorinated olefins such as chlorinated polypropylene and chlorinated polyethylene, polymer alloys of polypropylene and olefin rubber, and polymer alloys of polypropylene and thermoplastic elastomer can be used. As a method of forming the adhesive layer, a gravure coating method, a roll coating method, a coating method such as a comma coating method, a gravure printing method,
There are printing methods such as a screen printing method. Further, it is also possible to form an adhesive layer by laminating an adhesive sheet made of the above material by a laminating method or the like.

The structure of the transfer layer is not limited to the above-described embodiment. For example, when a material having excellent adhesiveness to the transfer object is used as the material of the design layer, the adhesive layer is omitted. be able to. If the design layer requires concealment, a concealment layer may be provided. The concealing layer may be formed in the same manner as the design layer.

Next, a method of decorating the surface of a resin molded product as an object to be transferred using the above-described transfer material and the simultaneous transfer method by injection molding will be described.

First, a transfer material is fed into a molding die composed of a movable die and a fixed die. At this time, the sheet transfer material may be fed one by one, or a necessary portion of a long transfer material may be sent intermittently. When a long transfer material is used, it is preferable to use a feeder having a positioning mechanism so that the register between the design layer of the transfer material and the molding die coincides with each other. In addition, when the transfer material is intermittently fed, if the transfer material is fixed by the movable type and the fixed type after the position of the transfer material is detected by the sensor, the transfer material can always be fixed at the same position. This is convenient because no misalignment of the design layer occurs.

After the molding die is closed, a molten resin is injected and filled into the die from a gate provided on the fixed die, and a transfer material is adhered to the surface of the transfer material simultaneously with the formation of the transfer object.

After cooling the resin molded article as the transfer object,
Open the molding die and take out the resin molded product. Finally, the base sheet of the transfer material is peeled off. In this way, by transferring only the transfer layer to the surface of the molded article, a simultaneously decorated decorative molded article can be obtained.

In order to obtain an insert material, the following method may be used.

The insert material has at least a design layer on a base sheet. As the base sheet, the same sheet as that of the transfer material may be used. Particularly preferred is a polyolefin-based sheet, and since the insert material has a base sheet remaining on the surface of the molded article, it is not necessary to separate the molded article for reuse at the time of disposal. This is because it becomes possible. A backing sheet, which is a sheet having a thickness of about 0.08 to 3 mm, can be attached to the adhesive layer. The material of the backing sheet is preferably a polyolefin sheet for the same reason. The same pattern layer as that for the transfer material may be used. Further, the same adhesive layer as that of the transfer material may be used. Therefore, the insert material differs from the transfer material in that it does not have a release layer.

The insert material can be obtained as described above. Next, a method of using the insert material will be described.

The insert material is placed between the core mold having the gate and the cavity mold having the concave portion using an insert material feeding device or the like, and is fixed in or around the cavity mold by means such as a clamp. When the molding shape is deep drawing, the insert material may be heated and softened by a heat source, and may be closely attached to the surface of the cavity mold by vacuum suction from the cavity mold side. The cavity mold and the core mold are clamped to form a closed space between the insert material and the core mold. The molten resin is injected into this space. As the molten resin, the same resin as that when the transfer material is used may be used.
If the cavity mold and the core mold are opened, a molded product in which the insert material and the molding resin are integrated can be obtained.

Further, insert molding can be performed as follows. First, the insert material is fixed to a preforming mold having a concave portion for deep drawing by means of a clamp or the like, and then the insert material is heated and softened by a heat source and vacuum-sucked from the preforming mold side to form a preforming mold. Adhere to the surface. Next, the vacuum suction is released, and the insert material is taken out of the preforming mold. In this way, a deep drawn insert material can be obtained. Next, the preformed insert material is placed between a core mold having a gate and a cavity mold having a concave portion for deep drawing, and is fixed in or around the cavity mold by means such as a clamp. Next, the cavity mold and the core mold are clamped to form a closed space between the insert material and the core mold. If the molten resin is injected into this space and the cavity mold and the core mold are opened, the insert material and the molding resin can be integrated.

[0055]

EXAMPLES (Comparative Example 1) A polyethylene terephthalate film having a thickness of 0.05 mm was used as a base sheet, a release layer was formed thereon, and a transparent window was formed at the center using eight colored inks thereon. A pattern layer is formed by a gravure printing method so as to have a pattern consisting of an opaque color pattern and characters around the hologram, and a chlorinated olefin to be bonded to a polypropylene resin is further formed as an adhesive layer by a gravure printing method. A transfer material having a thickness of 0.057 mm was obtained and used as a decorative sheet.

The decorative sheet was sandwiched in a mold of a sleep rate system for producing a nameplate panel, heated in the mold to perform preliminary molding, and then subjected to simultaneous molding transfer by injection molding. 0.7mm diameter on the back of the nameplate as a gate
(A = 0.7) having a circular pinpoint gate was used. The pinpoint gate was adopted
This is to eliminate the need for gate processing in the post-process after molding.
The reason why the gate diameter is reduced to 0.7 mm is to make the gate trace as inconspicuous as possible.

In the injection molding step, a polypropylene resin (Novatec PP BC08AHSW manufactured by Nippon Polychem Co., Ltd.) melted at 230 ° C. in a cylinder was injection-molded into a mold through a gate. A test temperature of 230 ° C. and a nominal load of 2.16 kg of the polypropylene resin used in the melt flow rate test method specified in JIS K7210
Was 80 g / 10 min (b = 80). The reason why this resin is adopted is that a resin having a good flow (high melt flow rate) is selected as much as possible because the gate diameter is reduced. In this case, b / a = 114.

However, despite the high pressure applied during molding, the molten resin is difficult to fill into the molded product.
Furthermore, when the molding pressure was increased, the adhesive layer and the design layer were melted and flown, and only a molded simultaneous decorative molded product having a problem in appearance was obtained. Also, wrinkles were generated on the base sheet, and traces of wrinkles were left on the surface of the simultaneously molded decorative molded product. Further, the adhesive layer flowing away resulted in poor adhesion between the molding resin and the decorative sheet.

Example 1 The gate diameter of the mold used in Comparative Example 1 was 0.8 mm, and the flow of the molten resin was improved.
b / a = 100. Except for changing the gate diameter, a molded simultaneous decorative molded product was obtained in the same manner as in Comparative Example 1,
All the defects caused in Comparative Example 1 were eliminated, and a simultaneously decorated decorative molded product having no problem in appearance and physical properties was obtained.

Example 2 Melt flow rate was 1.
Using a polypropylene resin of No. 4 (Grand Polymer Co., Ltd., Grand Polypro J101), a base sheet having a thickness of 0.12 mm was prepared by a T-die extrusion method (c = 1.
4). After the surface of the base sheet is corona-treated, a mixed resin of chlorinated polypropylene and urethane is coated at a thickness of 1 μm as an anchor layer, and as a design layer, solid printing is performed with a metallic ink containing an aluminum paste at a resin solid content ratio of 20% by weight. Was done. Further, a backing sheet (melt flow rate c = 8) having a thickness of 0.2 mm made of a sheet of a black-colored resin mainly composed of polypropylene and a thermoplastic elastomer (TPO) is laminated by a dry laminating method. Was obtained as a decorative sheet by obtaining an insert material of 0.34 mm. After heating this at 150 ° C., vacuum forming was performed, and preforming was carried out into a shape that would fit approximately in the cavity of the injection mold.

Next, the decorative sheet was inserted into the cavity of the mold used in Example 1, the mold was clamped, and injection molding was performed in the same manner as in Example 1 to obtain a simultaneously decorated decorative molded product.
In addition, b / a = 100.

The simultaneously molded decorative article thus obtained had no problem in appearance and physical properties.

Comparative Example 2 A decorative sheet similar to the decorative sheet of Example 2 was used, and a mold capable of forming a front panel of an automobile was used. A resin mainly composed of polypropylene having a melt flow rate of 20 which is required for heat resistance for an automobile panel is used.
When the glass fibers were mixed to suppress the melt flow rate, the melt flow rate became 0.05 (b = 0.05). Also, since the flow of the molten resin is poor, the gate of the mold is 1.5
mm × 50 mm film gate (a ≒ 50.mm).
0). Therefore, b / a = 0.001.

When the molding temperature was raised to 260 ° C. to form a simultaneously-decorated molded product, the resin flow was poor, and the metallic color due to the flow of the aluminum paste of the design layer of the decorative sheet and the change in the direction of the aluminum particles was observed. Unevenness occurred.

Example 3 A polypropylene-based resin having a melt flow rate of 80 was used, and glass fibers were mixed at the same mixing ratio as in Example 2 to obtain a polypropylene resin containing glass fibers. The melt flow rate was set to 5.0 (b = 5.0). The mold used in Comparative Example 2 was used. Therefore, b
/A=0.1.

The other conditions were the same as in Comparative Example 2 to obtain a simultaneously-molded and molded product. The defect caused in Comparative Example 2 was resolved, and a simultaneously-molded and decorated product having no problem in appearance and physical properties was obtained. Obtained.

[0067]

Since the present invention has the above-described structure, it has the following effects.

In the method for producing a simultaneously-decorated molded article according to the present invention, a decorative sheet is placed in a mold having a cavity,
Injection of a molten resin containing a propylene-based resin as a main component into a mold to obtain a molded article in which the decorative sheet and the resin are integrated. (Mm), the test temperature 230 in the melt flow rate test method specified in Japanese Industrial Standard (JIS) K7210
The melt flow rate of a resin containing a propylene resin as a main component at a nominal load of 2.16 kg at b.
min), the relationship of 0.1 ≦ b / a ≦ 100 is satisfied, so that the resin is sufficiently filled in the cavity,
It is possible to easily obtain a molded simultaneous decorative molded article having an excellent appearance in which the decorative sheet is free from wrinkling and damage.

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Claims (7)

[Claims] A decorative sheet is placed in a mold having a cavity, a molten resin containing a propylene-based resin as a main component is injected into the mold, and a molded article in which the decorative sheet and the resin are integrated is formed. In the method for producing a simultaneously-decorated molded article to be obtained, the gate diameter of the mold is set to a (mm) and the Japanese Industrial Standard (JIS) K7
The melt flow rate of a resin containing a propylene-based resin as a main component at a test temperature of 230 ° C. and a nominal load of 2.16 kg in the melt flow rate test method specified in 210 is b
(G / 10 min), 0.1 ≦ b / a ≦ 10
A method for producing a simultaneously decorated decorative molded product, wherein a relationship of 0 is established. 2. A resin comprising a propylene resin as a main component is at least one of a propylene resin alone, a polymer alloy of a propylene resin alone and an olefin rubber, and a polymer alloy of a propylene resin alone and a thermoplastic elastomer. The method for producing a simultaneously decorated decorative molded article according to claim 1, wherein the number is one. 3. The method according to claim 1, wherein the gate is a pinpoint gate. 4. The method according to claim 1, wherein the temperature of the molten resin containing a propylene-based resin as a main component is 180 to 260 ° C. 5. The method according to claim 1, wherein the decorative sheet is a transfer material or an insert material. 6. The decorative sheet is an insert material, the material of the base sheet constituting the insert material is polyolefin, and the test temperature is 230 ° C. in a melt flow rate test method specified in Japanese Industrial Standards (JIS) K7210. When the melt flow rate of the base sheet at a nominal load of 2.16 kg is c (g / 10 min), 0.5 ≦ c
The method for producing a simultaneously decorated decorative molded product according to any one of claims 1 to 5, wherein a relationship of ≤ 30 is satisfied. 7. The decorative sheet is an insert material, and the base sheet and the backing sheet constituting the insert material are made of polyolefin.
S) When the melt flow rate of the base sheet and the backing sheet at a test temperature of 230 ° C. and a nominal load of 2.16 kg in the melt flow rate test method specified in K7210 is c (g / 10 min), 0.5 ≦ c ≦ 3
The method for manufacturing a simultaneously decorated decorative molded product according to claim 1, wherein a relationship of 0 is satisfied.