JP2019072884A - Manufacturing method of decorative molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a decorated molded product capable of preventing generation of gas accumulation and deterioration of appearance while securing moldability even when vacuum molding or vacuum pressure molding is used.
SOLUTION: A breaking elongation at 120 ° C of the above-mentioned decorative film is included, including a step of sticking a laminate of a decorative film and a pressure-sensitive adhesive layer from the pressure-sensitive adhesive layer side to a substrate by vacuum forming or vacuum pressure forming. Is 200% or more, and the surface roughness of the pressure-sensitive adhesive layer side of the base material is 1 to 3 μm.
[Selected figure] Figure 1-2

Description

The present invention relates to a method for producing a decorative molded article.

As a method of imparting designability to a substrate (adherend), a method of sticking a decorative film to a substrate is conventionally used.

In Patent Document 1, a decorative sheet including a surface layer and an adhesive layer containing a polymer having 25 to 100% by mass of propylene units is prepared, and a substrate containing a polymer having 25 to 100% by mass of propylene units is prepared. A method for producing a structure, comprising applying the decorative sheet to the substrate by vacuum pressure forming or vacuum forming to form a structure in which the decorative sheet and the substrate are integrated. ing.

JP, 2013-14027, A

When a decorative film is attached to a substrate to produce a decorated molded product, vacuum forming or vacuum pressure forming may be used. However, when a decorated molded article is manufactured by vacuum molding or vacuum pressure air molding, gas accumulation occurs between the decorated film and the base material, and the appearance (designability) of the decorated molded article is deteriorated. There were times when

The present invention has been made in view of the above-mentioned present situation, and it is possible to prevent generation of gas pool and deterioration of the appearance while securing the formability even when using vacuum forming or vacuum pressure forming. An object of the present invention is to provide a method for producing a decorative molded article.

When manufacturing a decorated molded article using vacuum forming or vacuum pressure forming, the inventor of the present invention has a decorated film whose breaking elongation is in a specific range, and a base material whose surface roughness is in a specific range. By using the above, it was found that it was possible to prevent the occurrence of gas accumulation and the deterioration of the appearance while securing the formability, and completed the present invention.

The method for producing a decorative molded article of the present invention includes the step of sticking a laminate of a decorative film and a pressure-sensitive adhesive layer from the pressure-sensitive adhesive layer side to a substrate by vacuum molding or vacuum pressure forming. The elongation at break of the film at 120 ° C. is 200% or more, and the surface roughness of the base on the pressure-sensitive adhesive layer side is 1 to 3 μm.

It is preferable that the said decoration film contains a polyvinyl chloride.

The thickness of the pressure-sensitive adhesive layer is preferably 10 to 50 μm.

The pressure-sensitive adhesive layer preferably contains an acrylic pressure-sensitive adhesive or a urethane-based pressure-sensitive adhesive.

It is preferable that the said base material contains an acrylonitrile butadiene styrene copolymer.

According to the method of manufacturing a decorated formed product of the present invention, even when vacuum forming or vacuum pressure forming is used, decoration capable of preventing generation of gas pool and deterioration of appearance while securing formability. Molded articles can be manufactured.

It is a cross-sectional schematic diagram for demonstrating the method to manufacture a decorating molded article by vacuum pressure air forming (process a, b, c). It is a cross-sectional schematic diagram for demonstrating the method to manufacture a decorating molded article by vacuum pressure air forming (process d, e, f). It is a cross-sectional schematic diagram which shows an example of the decorative molded product manufactured by the manufacturing method of the decorative molded product of this invention.

The method for producing a decorative molded article of the present invention includes the step of sticking a laminate of a decorative film and a pressure-sensitive adhesive layer from the pressure-sensitive adhesive layer side to a substrate by vacuum molding or vacuum pressure forming. The elongation at break of the film at 120 ° C. is 200% or more, and the surface roughness of the base on the pressure-sensitive adhesive layer side is 1 to 3 μm.

In the present specification, "film" is synonymous with "sheet" and does not distinguish between the two by thickness.

In the present specification, "X to Y" means "X or more and Y or less".

The method for producing a decorative molded article of the present invention includes the step of sticking the laminate of the decorative film and the pressure-sensitive adhesive layer from the pressure-sensitive adhesive layer side to the substrate by vacuum forming or vacuum pressure forming. Thereby, a decorative molded article having a decorative film, a pressure-sensitive adhesive layer, and a base material in order is manufactured, and the designability by the decorative film is imparted to the base material.

Vacuum forming is a forming method using a vacuum and is performed, for example, as follows. First, the decorative film and the base material are set in the molding chamber under atmospheric pressure. Next, the heater is used to heat to a desired molding temperature to soften the decorative film. And the space between a decoration film and a substrate is made into a vacuum state, and a decoration film is pressed to a substrate. Thus, the decorative film is adsorbed to the base material and attached along the surface shape of the base material. Thereafter, the product is cooled, returned to the normal temperature state, and the vacuum state is released, whereby the manufactured decorative molded product can be taken out from the molding chamber. Here, if necessary, the excess portion of the decorative film that has run out of the substrate may be trimmed. When the decorative film can be stretched at normal temperature and the degree of vacuum in the molding chamber is set high, the decorative film can be attached to the substrate at normal temperature.

Vacuum pressure forming is also referred to as TOM forming (three-dimensional laminate forming), and is performed using, for example, a vacuum pressure forming apparatus. Vacuum pressure forming is performed, for example, as follows. First, after setting a decorating film and a base material in the molding chamber of atmospheric pressure state, the molding chamber is made airtight. Next, the inside of the molding chamber is vacuum-suctioned with a vacuum tank to make a vacuum. Subsequently, while maintaining the vacuum state, the heater is used to heat to a desired forming temperature to soften the decorative film. Then, the substrate is pressed against the softened decorative film. Subsequently, the molding chamber is brought to atmospheric pressure, and compressed air is supplied from the compressed air tank into the molding chamber. Thereby, a decoration film is pressed by a base material, and is stuck along the surface shape of a base material. Then, it is cooled and returned to the normal temperature state, and when the compressed air is released, the manufactured decorative molded product can be taken out from the molding chamber. Here, if necessary, the excess portion of the decorative film that has run out of the substrate may be trimmed.

The molding temperature (heating temperature) in vacuum molding or vacuum pressure molding is preferably 80 to 150 ° C. If the molding temperature is lower than 80 ° C., the decorative film may not be sufficiently softened and it may be difficult to stick along the surface shape of the substrate. If the molding temperature is higher than 150 ° C., the decorative film may be excessively softened, and the designability of the decorative film may change, or holes may be opened at the time of molding due to a decrease in tensile strength of the decorative film.

The heating time at the forming temperature in vacuum forming or vacuum pressure forming is preferably 50 to 80 seconds. When the heating time is shorter than 50 seconds, the decorative film may not be sufficiently softened, and it may be difficult to stick along the surface shape of the substrate. If the heating time is longer than 80 seconds, the decorative film may be too soft, and the design of the decorative film may change, or the tensile strength of the decorative film may decrease to open holes during molding.

The degree of vacuum in vacuum forming or vacuum pressure forming is preferably as low as possible from the viewpoint of preventing the generation of a gas pool, but may be 0.2 kPa or less. According to the method of manufacturing a decorated formed product of the present invention, the gas pooling may be performed even when the degree of vacuum is set relatively high, for example, to 0.1 to 0.2 kPa, due to restrictions such as molding conditions. Occurrence is prevented.

In vacuum forming or vacuum pressure forming, a laminate of the decorative film and the pressure-sensitive adhesive layer is attached to the substrate from the pressure-sensitive adhesive layer side. Thereby, the adhesiveness of a decoration film and a base material increases. The pressure-sensitive adhesive layer may be formed in advance on the surface of the decorative film to be attached to the substrate. Examples of the method for forming the pressure-sensitive adhesive layer include conventionally known methods. For example, the pressure-sensitive adhesive may be applied directly on the surface of the decorative film, or the surface of the support separately prepared with the pressure-sensitive adhesive. Once applied on top, the applied adhesive may be transferred to a decorative film to be formed.

The method for producing a decorated formed article by vacuum pressure forming will be described in more detail with reference to FIGS. 1-1 and 1-2. 1-1 is a cross-sectional schematic diagram for demonstrating the method to manufacture a decorating molded article by vacuum pressure air forming (process a, b, c). FIGS. 1-2 is a cross-sectional schematic diagram for demonstrating the method to manufacture a decorating molded article by vacuum pressure air forming (process d, e, f).

The vacuum pressure forming apparatus 100 is connected to the upper forming chamber 110, the lower forming chamber 120 paired with the upper forming chamber 110, the table 130 disposed in the lower forming chamber 120, and the upper forming chamber 110 and the table 130. Drive device 140, a pipe 160 drawn from the upper molding chamber 110 and the lower molding chamber 120, a vacuum tank 150 connected to the upper molding chamber 110 and the lower molding chamber 120 via the pipe 160, and the upper molding chamber 110 It has a heater 170 disposed therein, and a compressed air tank 180 connected to the upper molding chamber 110. The upper molding chamber 110 and the table 130 can be moved up and down independently by the drive device 140.

(Process a)
The base 20 is set on the table 130 in the lower molding chamber 120 with the upper molding chamber 110 raised by the drive device 140 (at atmospheric pressure), and the laminate of the decorative film 10 and the adhesive layer 30 is lowered. It is set on the upper surface of the forming chamber 120. Thereafter, the upper molding chamber 110 is lowered by the drive device 140 to make each of the upper molding chamber 110 and the lower molding chamber 120 airtight as shown in FIG.

(Process b)
As shown in FIG. 1B, the inside of the upper molding chamber 110 and the inside of the lower molding chamber 120 are vacuum-suctioned by the vacuum tank 150 via the piping 160 to make a vacuum state (very low pressure state).

(Process c)
As shown in FIG. 1C, the decorative film 10 is heated and softened using the heater 170 while maintaining the vacuum state.

(Process d)
As shown in FIG. 1D, the table 130 is raised by the drive device 140, and the base material 20 is pressed against the softened decorative film 10 through the adhesive layer 30.

(Process e)
The inside of the upper molding chamber 110 is brought to the atmospheric pressure state (the inside of the lower molding chamber 120 remains in a vacuum state), and further, compressed air is supplied from the compressed air tank 180 into the upper molding chamber 110. Thereby, as shown to FIG. 1-2 (e), the decoration film 10 is pressed by the base material 20 through the adhesive layer 30, and is affixed along the surface shape of the base material 20. As shown in FIG.

(Process f)
As shown in FIG. 1F, the insides of the upper molding chamber 110 and the lower molding chamber 120 are returned to the atmospheric pressure state, and the upper molding chamber 110 is raised by the drive device 140. Thereby, the base material 20 covered with the decoration film 10 and the adhesive layer 30 can be taken out. Thereafter, if necessary, the surplus portions of the decorative film 10 and the pressure-sensitive adhesive layer 30 protruding from the base material 20 are trimmed to complete the decorative molded product 1 as shown in FIG. FIG. 2: is a cross-sectional schematic diagram which shows an example of the decorative molded product manufactured by the manufacturing method of the decorative molded product of this invention. The decorative molded product 1 is a laminate having the decorative film 10, the pressure-sensitive adhesive layer 30, and the base material 20 in order.

On the other hand, when producing a decorating molded article by vacuum molding, it can carry out similarly to the manufacturing method by vacuum pressure air molding mentioned above except not using compressed air.

Then, each member used when manufacturing a decorating molded article is demonstrated below.

(Decorated film)
The decorative film is not particularly limited as long as it is a stretchable film. Examples of the material of the decorative film include polyvinyl chloride; polyurethane; polyolefins such as polyethylene, polypropylene, polybutene and polybutadiene; poly (meth) acrylates; polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate; Can be mentioned. These materials may be used alone or in combination of two or more.

The decorative film preferably contains polyvinyl chloride. Thereby, since a decoration film becomes easy to be extended and it becomes difficult to break, it becomes easy to follow the surface shape of a substrate. Moreover, it becomes easy to process with which printing is performed with respect to a decoration film, or an adhesive layer is formed. Furthermore, when the decorative film contains polyvinyl chloride, it can be molded at a low temperature as compared to a film containing a resin other than polyvinyl chloride (for example, polyethylene terephthalate), so that good formability can be obtained. .

Examples of polyvinyl chloride include homopolymers of vinyl chloride, and copolymers of vinyl chloride and other monomers. Among them, homopolymers of vinyl chloride are preferable from the viewpoint of dimensional stability.

When polyvinyl chloride is a copolymer of vinyl chloride and another monomer, examples of the other monomer include vinyl esters such as vinyl acetate and vinyl propionate; ethylene, propylene, styrene and the like Olefins: (meth) acrylates such as methyl acrylate, ethyl acrylate and methyl methacrylate; maleic acid diesters such as dibutyl maleate and diethyl maleate; fumaric acid diesters such as dibutyl fumarate and diethyl fumarate; acrylonitrile Vinyl cyanides such as methacrylonitrile; vinyl halides such as vinylidene chloride and vinyl bromide; vinyl ethers such as methyl vinyl ether and ethyl vinyl ether; and the like. These monomers may be used alone or in combination of two or more.

When polyvinyl chloride is a copolymer of vinyl chloride and another monomer, the content of the other monomer in the copolymer is usually 50% by weight or less, preferably 10% by weight. % Or less. If the content of other monomers is more than 50% by weight, the bending resistance of the decorative film may be reduced.

The average degree of polymerization of polyvinyl chloride is suitably adjusted in accordance with the desired hardness of the decorative film, the amount of plasticizer used for adjusting the hardness, etc., but it is preferable from the viewpoint of processability. Is 800-1200. In the present specification, "average degree of polymerization of polyvinyl chloride" means the average degree of polymerization measured in accordance with "JIS K 6721 vinyl chloride resin test method".

The decorative film may contain a plasticizer. Examples of the plasticizer include epoxy plasticizers such as epoxidized soybean oil and epoxy resin; high molecular polyester plasticizer; octyl phthalate (di-2-ethylhexyl phthalate), dibutyl phthalate, dinonyl phthalate, diisononyl phthalate And the like; aliphatic dibasic acid diesters such as cyclohexanedicarboxylic acid ester, dioctyl adipate and dioctyl sebacate; phosphoric acid triesters such as tricresyl phosphate and trioctyl phosphate; and the like. These plasticizers may be used alone or in combination of two or more.

Examples of high molecular weight polyester plasticizers include polyalkylene glycol diesters such as polyethylene glycol diesters, polypropylene glycol diesters and polyethylene glycol polypropylene glycol diesters of phthalic acid; polyethylene glycols of aliphatic dibasic acids such as adipic acid and sebacic acid Examples thereof include diesters, polypropylene glycol diesters, and polyalkylene glycol diesters such as polyethylene glycol polypropylene glycol diesters. These high molecular weight polyester plasticizers may be used alone or in combination of two or more.

When the decorative film contains polyvinyl chloride and a plasticizer, the blending amount of the plasticizer is preferably 5 to 30 parts by weight, more preferably 15 to 20 parts by weight with respect to 100 parts by weight of polyvinyl chloride. . If the blending amount of the plasticizer is less than 5 parts by weight, the processability and the formability may be reduced. If the blending amount of the plasticizer is more than 30 parts by weight, the heat resistance may be lowered.

The decorative film may further contain an additive such as a stabilizer, an ultraviolet light absorber, a colorant, a foaming agent, a lubricant, a modifier, a filler, and a diluent. As these additives, conventionally known ones can be used.

The breaking elongation at 120 ° C. of the decorative film is 200% or more. Thereby, a decoration film becomes easy to follow to the end of a substrate (especially, a substrate which has a three-dimensional curved surface), and fabrication nature increases. When the breaking elongation at 120 ° C. of the decorative film is smaller than 200%, the decorative film does not follow up to the end of the substrate, and the formability is reduced. On the other hand, when the elongation at break of the decorative film at 120 ° C. is too large, the breaking strength is lowered. Therefore, when the decorative film is heated and softened at the time of producing the decorative molded product, the balance in the molding chamber is improved. It becomes difficult to keep. Specifically, when the inside of the molding chamber is in a vacuum state, the decorative film may warp upward (opposite the base) due to the variation of the degree of vacuum (lower side) (base side) May be bent (convex). For example, when the decorative film warps upward, the surface area is increased, so that the film can not be attached well to the substrate, and creases may occur. From such a viewpoint, the breaking elongation at 120 ° C. of the decorative film is preferably 400% or less. Specifically, the elongation at break of the decorative film at 120 ° C., specifically, a test piece (decorative film) punched into a dumbbell shape No. 1 specified in “JIS K 6251”, an automatic recording type tensile tester Elongated at a temperature of 120 ° C., a marked line distance of 40 mm, a distance between chucks of 80 mm, and a tensile speed of 200 mm / min, and measured as an elongation when broken. The breaking elongation at 120 ° C. of the decorative film may be at least 200% or more in the perpendicular direction (CD: Cross Direction) orthogonal to the machine direction (MD: Machine Direction). Here, a flow direction (MD) means the flow direction of resin at the time of forming a decoration film.

The thickness of the decorative film is preferably 80 to 350 μm. If the thickness of the decorative film is smaller than 80 μm, it may be difficult for the decorative film to follow the end of the substrate, and the formability may be reduced. When the thickness of the decorative film is larger than 350 μm, the decorative film may be too hard and may be difficult to be stuck along the surface shape of the substrate.

The decorative film can be formed, for example, by calendering. Calender molding is a method of rolling a raw material (resin) with a roll and molding it into a film. According to calendering, decorative films of various sizes with uniform thickness can be easily formed regardless of the composition thereof. As a calender type used at the time of calender molding, for example, inverted L type, Z type, upright two type, L type, inclined three type and the like can be mentioned.

Printing may be given to the surface of a decoration film. Thereby, the designability of the decorated molded product is enhanced. As a printing method to a decoration film, an inkjet printing method, a screen printing method, a gravure printing method etc. are mentioned, for example. For example, when printing is performed using an inkjet printing method, the solvent-based ink may be jetted onto the decorative film by an inkjet printer. According to such a printing method, even if the decorative film does not have the ink receiving layer, it can be directly printed on the decorative film.

The surface of the decorative film may be embossed. As a result, since an embossed shape (concave and convex shape) is imparted to the surface of the decorative film, the texture improves by the embossed shape, and the designability is significantly enhanced. Embossing may be performed, for example, by inserting the above-described calendered resin film rolled between an embossing roll provided with a concavo-convex structure on the surface and a back roll. Thereby, the decorating film by which the uneven structure of the embossing roll was transcribe | transferred on the surface is formed.

(Pressure-sensitive adhesive layer)
The pressure-sensitive adhesive layer is not particularly limited as long as it has an adhesive function (pressure-sensitive adhesiveness). Examples of the material of the pressure-sensitive adhesive layer include acrylic pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, polyester-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, and silicon-based pressure-sensitive adhesives.

The pressure-sensitive adhesive layer preferably contains an acrylic pressure-sensitive adhesive or a urethane-based pressure-sensitive adhesive. As a result, the tackiness, processability, heat aging resistance, moisture aging resistance, and weather resistance of the pressure-sensitive adhesive layer are sufficiently enhanced.

The acrylic pressure-sensitive adhesive is preferably an acrylic hot melt pressure-sensitive adhesive. An acrylic hot melt pressure-sensitive adhesive is preferably used when producing a decorated molded article by vacuum forming or vacuum pressure forming because it contains no solvent.

The urethane-based pressure-sensitive adhesive preferably comprises a cured product of a thermosetting polyurethane composition. As a component of a thermosetting polyurethane composition, a polyol component, a polyisocyanate component, a tackifier etc. are mentioned, for example.

The thickness of the pressure-sensitive adhesive layer is preferably 10 to 50 μm. If the thickness of the pressure-sensitive adhesive layer is smaller than 10 μm, the adhesion between the decorative film and the substrate may not be sufficiently enhanced. When the thickness of the pressure-sensitive adhesive layer is larger than 50 μm, when a pressure-sensitive adhesive containing a solvent is used when forming the pressure-sensitive adhesive layer, the drying time of the solvent may be prolonged and the production efficiency may be reduced.

(Base material)
As the base material, for example, vehicles such as bicycles, motorcycles, automobiles, buses, trains, etc .; ships; aircrafts such as airplanes and helicopters; helmets; household items such as furniture and home appliances; , Billboards, doors, structures such as gates; electronic terminals such as smartphones and tablets; cabinets, office desks, office supplies such as personal computers; construction materials of construction sites; and these components.

As a material of a base material, resin, a metal, a ceramic etc. are mentioned, for example.

As the resin, for example, acrylonitrile-butadiene-styrene copolymer (ABS resin), polyethylene resin, polypropylene resin, polystyrene resin, polyethylene terephthalate resin, polyvinyl alcohol resin, polyvinyl chloride resin, polyamide resin, polyacetal resin, polycarbonate resin, Examples thereof include ionomer resins, acrylic resins, and resin compositions in which various additives such as inorganic fibers are added to these resins.

As a metal, iron, copper, aluminum, stainless steel, these alloys etc. are mentioned, for example.

The substrate preferably contains an acrylonitrile-butadiene-styrene copolymer. As a result, the rigidity, processability and impact resistance of the substrate are sufficiently enhanced.

The surface roughness of the base on the adhesive layer side is 1 to 3 μm. As a result, when producing a decorated molded product by vacuum molding or vacuum pressure forming, the portion where the gas is collected is dispersed without being concentrated locally between the pressure-sensitive adhesive layer and the substrate, and as a result, It becomes difficult to be recognized as a gas reservoir. Therefore, according to the method of manufacturing a decorated molded article of the present invention, even when vacuum forming or vacuum pressure forming is used, generation of a gas pool is prevented, and deterioration of the appearance of the decorated molded article is also prevented. Be done. When the surface roughness on the side of the pressure-sensitive adhesive layer of the substrate is smaller than 1 μm, a gas accumulation occurs in the decorated formed product (it becomes visible). When the surface roughness on the pressure-sensitive adhesive layer side of the substrate is larger than 3 μm, in the decorated molded product, the influence of the uneven shape on the surface of the substrate extends to the decorative film through the pressure-sensitive adhesive layer, on the surface of the decorative film An uneven shape appears. As a result, the appearance of the decorated molded product is degraded. The surface roughness of the pressure-sensitive adhesive layer side of the substrate may be 1 to 3 μm in a cross section along at least one direction. In the present specification, "surface roughness" means the arithmetic mean roughness (Ra) defined in "JIS B 0601".

As a method of setting the surface roughness on the pressure-sensitive adhesive layer side of the substrate to 1 to 3 μm, for example, a method of roughening by rubbing the surface of the substrate with sand paper (for example, sand paper with count 280) Be

In the surface on the side of the pressure-sensitive adhesive layer of the substrate, the region having a surface roughness of 1 to 3 μm should be at least included in the area on which the decorative film and the pressure-sensitive adhesive layer are laminated. Is preferred.

As described above, according to the method for producing a decorative molded article of the present invention, the decorative film having a breaking elongation of 200% or more at 120 ° C., and the surface roughness on the adhesive layer side is 1 to 3 μm. Because the film is used in combination with the substrate, the decorative film can easily follow the edge of the substrate even when vacuum forming or vacuum pressure forming is used, and generation of gas accumulation and deterioration of the appearance are also prevented. Ru. That is, according to the method of manufacturing a decorated formed product of the present invention, it is possible to prevent generation of gas accumulation and deterioration of the appearance while securing the formability. The method for producing a decorative molded article of the present invention is particularly effective when a decorative film is attached to a base having a three-dimensional curved surface (for example, an exterior member for a two-wheeler such as a bicycle or a motorcycle).

EXAMPLES Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.

Example 1
A polyvinyl chloride composition was prepared by adding 15 parts by weight of diisononyl phthalate as a plasticizer and 5 parts by weight of an acrylic polymer processing aid to 100 parts by weight of polyvinyl chloride having an average polymerization degree of 800. Made. Next, after melt-kneading the obtained polyvinyl chloride type composition with a Banbury mixer, it rolled by each roll of a calender main body, and produced the resin film. Then, the obtained resin film is embossed by being inserted between an embossing roll and a back roll provided with a concavo-convex structure on the surface, and a decorative film having a plurality of convex portions on the surface (the concavo-convex structure is The decorative film provided on the surface was formed. The height of each convex portion was 50 μm. The thickness of the decorative film (the distance from the back surface to the top of the convex portion on the front surface) was 300 μm.

The breaking elongation at 120 ° C. of the decorative film was 232%. The breaking elongation at 120 ° C. of the decorative film was measured by the following method. First, a dumbbell-shaped No. 1 test piece specified in “JIS K 6251” was punched out of the decorative film. In the test piece, the longitudinal direction corresponds to the vertical direction (CD) of the decorative film, and the short direction corresponds to the flow direction (MD) of the decorative film. Then, in the automatic recording type tensile testing machine, both ends in the longitudinal direction of the test piece were fixed by chucks. Here, the distance between marked lines was 40 mm, and the distance between chucks was 80 mm. Thereafter, the test piece was elongated in the longitudinal direction under conditions of a temperature of 120 ° C. and a tensile speed of 200 mm / min, and the elongation at break was taken as “break elongation”.

Next, an acrylic pressure-sensitive adhesive was applied on the surface opposite to the surface provided with the concavo-convex structure of the decorative film to form a pressure-sensitive adhesive layer. The thickness of the pressure-sensitive adhesive layer was 40 μm.

Next, a base material made of an acrylonitrile-butadiene-styrene copolymer having a three-dimensional curved surface was prepared, and the base material was roughened using a sandpaper having a number 280.

The surface roughness (arithmetic mean roughness (Ra)) of the substrate was 2.045 μm. The surface roughness of the substrate was measured using Mitutoyo's small surface roughness tester “Surf Test (registered trademark) SJ-310”.

Next, the laminated body of a decorating film and an adhesive layer was affixed on the base material from the adhesive layer side using the vacuum pressure forming apparatus "NGF-0406-T" made from a cloth application vacuum company. At this time, the roughened surface of the substrate was on the pressure-sensitive adhesive layer side. As a result, the decorated molding of Example 1 was completed. When vacuum pressure forming was performed, the forming temperature was 120 ° C., the heating time at the forming temperature was 50 to 80 seconds, and the degree of vacuum was 0.1 to 0.2 kPa.

(Comparative Examples 1 to 3)
A decorated molded article of each example was produced in the same manner as in Example 1 except that the surface roughness of the substrate was changed as shown in Table 1.

[Evaluation]
The following evaluation was performed about the decorative molded article of each case. The results are shown in Table 1.

(Gas accumulation)
With respect to the decorative molded product, the presence or absence of gas accumulation was visually confirmed. The judgment criteria were as follows.
○: No gas reservoir was visible.
X: Gas accumulation was visually recognized.

(appearance)
The surface condition before and after decoration formation of the decoration film is compared under the D65 light source, and the concavo-convex shape under the influence of roughening of the substrate appears on the surface of the decoration film after decoration formation as a line (1 cm or more) It was visually confirmed whether it was present. The judgment criteria were as follows.
○: The line was not visible.
X: Line was visually recognized.

In Example 1, generation of gas accumulation and deterioration of the appearance were prevented. Furthermore, in Example 1, the decorative film followed up to the edge of the substrate, and the formability was good.

In Comparative Example 1, since the surface roughness on the pressure-sensitive adhesive layer side of the base was smaller than 1 μm, a gas pool was visually recognized.

In Comparative Example 2, the surface roughness on the pressure-sensitive adhesive layer side of the substrate was smaller than 1 μm, so that a gas pool was visually recognized.

In Comparative Example 3, since the surface roughness on the pressure-sensitive adhesive layer side of the substrate was larger than 3 μm, the uneven shape due to the influence of the roughening of the substrate appeared on the surface of the decorative film and the appearance deteriorated.

1: Decorative molded product 10: Decorative film 20: Substrate 30: Adhesive layer 100: Vacuum pressure air molding device 110: Upper molding chamber 120: Lower molding chamber 130: Table 140: Drive device 150: Vacuum tank 160: Piping 170: Heater 180: Compressed air tank

Claims (5)

Bonding the laminate of the decorative film and the pressure-sensitive adhesive layer to the substrate from the pressure-sensitive adhesive layer side by vacuum forming or vacuum pressure forming;
The breaking elongation at 120 ° C. of the decorative film is 200% or more,
The surface roughness of the base on the pressure-sensitive adhesive layer side is 1 to 3 μm. The method for producing a decorative formed article according to claim 1, wherein the decorative film contains polyvinyl chloride. The thickness of the said adhesive layer is 10-50 micrometers, The manufacturing method of the decorative molded article of Claim 1 or 2 characterized by the above-mentioned. The method for producing a decorative formed article according to any one of claims 1 to 3, wherein the pressure-sensitive adhesive layer contains an acrylic pressure-sensitive adhesive or a urethane-based pressure-sensitive adhesive. The said base material contains an acrylonitrile butadiene styrene copolymer, The manufacturing method of the decorative molded article in any one of the Claims 1-4 characterized by the above-mentioned.

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