JP5755940B2 - Process for producing patterned blow molded article and patterned blow molded article obtained thereby - Google Patents

Description

  The present invention relates to a process for producing a blow molded article with a pattern to which patterns such as letters and figures are applied, and a blow molded article with a pattern obtained thereby.

  A so-called blow bottle obtained by blow molding a thermoplastic resin is thin and lightweight, and has excellent durability and can be manufactured at low cost. Widely used in applications.

  However, the blow bottle is generally molded from a polyolefin-based resin that has no polar group and has a high degree of crystallinity. There is a problem that you can not. In addition, it is conceivable to display these contents on a label and affix them to the bottle surface, but since the affinity for the adhesive for affixing the label is low, the label will be peeled off immediately. is there.

  Therefore, it has been proposed to improve the affinity with printing inks and adhesives by modifying the blow bottle surface by flame treatment or corona treatment, or by modifying with atmospheric pressure plasma irradiation (the following patents) Reference 1).

  In the middle of blow molding, after spraying ink onto the intermediate parison surface to give a pattern or character, the mold is closed to give the final shape, thereby giving the pattern or character to the surface of the molded product. There has also been proposed a method of adhering to (see Patent Document 2 below).

JP-A-10-310143 JP-A-11-170361

  However, if the reforming process is performed on the blow bottle surface as in Patent Document 1, the bottle surface may be damaged or the shape of the bottle may be deformed during the reforming process. In addition, there is a problem in that extra cost is required for reforming and it is not economical.

  On the other hand, if a pattern is to be printed on the parison surface as in Patent Document 2, it is necessary to install a separate printing device in the vicinity of the mold. Since it becomes dirty, every time the mold is opened, there is a problem that it is necessary to remove the residual ink adhering to the inside of the mold, which requires troublesome work. Further, the pattern on the parison surface may become unclear or distorted during shaping with a mold.

  The present invention has been made in view of such circumstances, and a process for producing a patterned blow-molded product that can easily and economically provide a clear color pattern (including characters) that does not easily peel off. And the objective is to provide a blow-molded article with a pattern obtained thereby.

In order to achieve the above object, the present invention provides a multilayer blow molded product in which a colored resin layer made of a polyolefin resin is formed on the inside and a transparent resin layer made of acrylonitrile-butadiene-styrene resin or ionomer resin is formed on the outside. And irradiating laser light from the outside of the multilayer blow molded article, passing through the transparent resin layer to reach the colored resin layer surface, and sequentially irradiating positions along the colored resin layer surface And a step of causing a colored pattern consisting of an irradiation locus of laser light to appear on the surface of the colored resin layer by moving the pattern, and the blow molding with a pattern so as to show the colored pattern through the transparent resin layer. The manufacturing method of the product is the first gist.

Further, the present invention provides a step of preparing a multilayer blow molded article in which a colored resin layer made of polyolefin resin is formed on the inside and a transparent resin layer made of acrylonitrile-butadiene-styrene resin or ionomer resin is formed on the outside thereof, A step of forming a metal thin film layer on at least a part of the surface of the multilayer blow molded article, and a laser beam is irradiated from the outside of the metal thin film layer, the metal thin film layer is removed, and the transparent resin layer is removed from the removed trace. And passing through the surface of the colored resin layer, and sequentially moving the irradiation position along the surface of the colored resin layer, thereby forming a watermark pattern composed of a laser beam irradiation locus on the metal thin film layer. And a step of causing a color pattern consisting of an irradiation locus of laser light to appear on the surface of the colored resin layer. The method was of textured blow-molded article to show watermark watermarks and the transparent resin layer of the metal thin film layer and the second aspect.

  Furthermore, in the present invention, among these, in particular, the thickness of the colored resin layer at least in the portion irradiated with the laser light is set to 0.2 to 2 mm, and the thickness of the transparent resin layer is set to 0.2 to 3 mm. A method for producing a patterned blow molded product using a multilayer blow molded product is a third gist.

And this invention is a blow molded article with a pattern obtained by the manufacturing method which is said 1st summary, Comprising: The colored resin layer which consists of polyolefin resin is formed inside, and the acrylonitrile butadiene styrene resin or ionomer is formed in the outer side It consists of a multilayer blow-molded product in which a transparent resin layer made of resin is formed, and a color pattern consisting of a laser beam irradiation locus is given to the surface of the colored resin layer, and the color pattern watermarks the transparent resin layer. A blow molded article with a pattern that can be seen is a fourth gist.

The present invention also relates to a blow molded article with a pattern obtained by the production method according to the second aspect, in which a colored resin layer made of a polyolefin resin is formed on the inner side and acrylonitrile-butadiene-styrene resin or ionomer on the outer side. It consists of a multilayer blow-molded product with a transparent resin layer made of resin, and a metal thin film layer is formed on at least a part of its surface, and a watermark pattern consisting of a laser beam irradiation locus is formed on the metal thin film layer The colored resin layer surface is provided with a color pattern composed of an irradiation locus of laser light, and the colored resin layer surface color pattern is formed of the watermark pattern of the metal thin film layer and the transparent resin layer. A blow molded article with a pattern that can be seen through is a fifth gist.

  Furthermore, in the present invention, in particular, the thickness of the colored resin layer is 0.2 to 2 mm and the thickness of the transparent resin layer is 0 at least in the portion provided with the color pattern composed of the laser beam irradiation locus. The sixth summary is a blow molded article with a pattern set to 2 to 3 mm.

  In the present invention, among them, the lightness of the colored resin layer (Munsell value by Munsell color system, hereinafter the same) is 7 to 10 and the lightness of the color pattern is 0 to 6. A blow molded product is a seventh summary, and a patterned blow molded product in which the lightness of the colored resin layer is 0 to 6 and the lightness of the color pattern is 7 to 10 is an eighth summary.

That is, the process for producing a blow molded article with a pattern, which is the first gist of the present invention, is to provide a color pattern to the blow molded article by combining a colored resin layer made of a specific resin material and a transparent resin layer. This is performed by irradiating the blow molded product with laser light. According to this manufacturing method, since a wide variety of color patterns can be easily imparted to the blow molded product in a short time, compared to conventional surface modification treatment of blow molded products and printing on parison, Manufacturing labor and cost can be greatly reduced.

  In addition, the method for producing a patterned blow molded product according to the second aspect of the present invention is such that a metal thin film layer is provided on the surface of the blow molded product, and laser beam irradiation is performed thereon, thereby coloring the inside of the blow molded product. A watermark pattern is formed on the metal thin film layer simultaneously with the formation of a color pattern on the surface of the resin layer. According to this manufacturing method, not only the same effect as described above can be obtained, but also the color pattern of the obtained blow molded product can be seen through the watermark pattern formed on the metal thin film layer. It has the advantage that it looks like a three-dimensional pattern.

  Among these production methods, in particular, a multilayer blow molded product in which the thickness of the colored resin layer is set to 0.2 to 2 mm and the thickness of the transparent resin layer is set to 0.2 to 3 mm is used. Is excellent in balance between the thinness unique to a blow-molded product and the color pattern expression by laser light irradiation.

  In addition, the patterned blow-molded product obtained by the manufacturing method which is the first gist of the present invention has a clear color pattern, so that, for example, even if it is an enumeration of fine characters, the contents are easy to read. Any characters and designs are formed as designed, and there is no deviation or distortion in line width or arrangement, so that they have a beautiful appearance.

  Moreover, the color pattern is formed on the surface of the colored resin layer placed inside the multilayer blow-molded product, so that it can be seen through the outer transparent resin layer, so it will not peel off or be damaged. , Has the advantage of maintaining a beautiful state over a long period of time. Furthermore, since the color pattern can be changed immediately by simply changing the setting of the laser light irradiation conditions, products with various color patterns according to needs can be delivered in a short period of time. Has the advantage of being able to

  Further, the blow molded article with a pattern obtained by the production method as the second gist of the present invention not only has the same effect as described above, but also has a metal thin film layer formed on at least a part of its surface, and is gorgeous. In addition, since the color pattern inside the transparent resin layer can be seen through the watermark pattern formed on the metal thin film layer, the part is as if the metal part was carved deeply, It has the advantage that it looks like a three-dimensional pattern with depth.

  Among the blow molded products with a pattern of the present invention, in particular, the colored resin layer having a lightness of 7 to 10 and a color pattern having a lightness of 0 to 6 has a ground color of the blow molded product, that is, The color of the colored resin layer that can be seen through the transparent resin layer is a light color with high brightness, but the color of the color pattern is a dark color with low brightness, so the contrast is strong and gives a clear impression. Can do.

  On the contrary, when the lightness of the colored resin layer is 0 to 6 and the lightness of the color pattern is 7 to 10, the color of the color pattern is low while the ground color of the blow molded product is a dark color with low lightness. However, since it is a light color with high brightness, the contrast is still strong and a clear impression can be given.

It is a perspective view of the cosmetics container which is one embodiment of this invention. It is a longitudinal cross-sectional view of FIG. (A), (b) is both explanatory drawing of the manufacturing method of the said cosmetics container. It is a perspective view of the cosmetics container which is other embodiment of this invention. (A), (b) is both explanatory drawing of the manufacturing method of the said cosmetics container.

  Next, an embodiment for carrying out the present invention will be described.

  FIG. 1 shows a perspective view of a cosmetic container according to an embodiment of the present invention. This cosmetic container is for containing a moisturizing lotion, and as shown in FIG. 2 which is a longitudinal sectional view thereof, a colored resin layer 1 made of white polypropylene is formed on the inside, and on the outside thereof. It is constituted by a two-layer blow molded bottle in which a transparent resin layer 2 made of a transparent ionomer resin is formed.

  And on the front of the body part of the cosmetic container (returning to FIG. 1), there is a letter 3 “Listen”, which is the brand name of the skin lotion, and a description regarding the efficacy and usage of the cosmetic material. 4 are both displayed in dark gray.

  The characters 3 and the description 4 are not printed on the surface of the container, but are displayed on the surface of the colored resin layer 1 inside the transparent resin layer 2, and this is the transparent resin layer 2 covering the surface of the container. As a result, the color resin layer 1 is clearly visible on the white background of the colored resin layer 1 and is visible.

  The cosmetic container can be obtained, for example, as follows.

  That is, first, a colored resin material for forming the inner colored resin layer 1 and a transparent resin material for forming the outer transparent resin layer 2 are prepared, and these two types of resins are coextruded using a die. To form a parison in which two layers are laminated. Then, the parison is mounted on a blow mold and blow-molded to obtain a bottle-shaped molded product as shown in FIG.

  Next, as shown to Fig.3 (a), laser beam is irradiated from two directions toward the trunk | drum front part of the said bottle-shaped molded product, the outer transparent resin layer 2 is allowed to pass, It moves to the position on the surface of the colored resin layer 1 where the character 3 and the explanatory note 4 are to be applied while sequentially adjusting the focal length. As a result, as shown in FIG. 3B, the resin in the portion where the focal length is matched burns, and a dark gray scoring mark P is formed in a limited region that becomes the irradiation trajectory of the laser beam. The character 3 and the explanatory note 4 as shown in FIG. 1 appear on the surface of the colored resin layer 1, more precisely, at the interface between the colored resin layer 1 and the transparent resin layer 2.

  In addition, the irradiation conditions of the laser beam for making the character 3 and the explanatory note 4 appear are controlled according to a program inputted in advance.

  Therefore, the cosmetic container of FIG. 1 obtained in this way is clearly provided with characters 3 and explanatory notes 4 (collectively referred to as “color pattern”) on the front side of the body portion. Since there is no deviation or distortion in the width or arrangement, not only the appearance of the character 3 is good, but the contents of the explanatory note 4 consisting of a series of fine characters are easy to read.

  Moreover, the color pattern is formed on the surface of the colored resin layer 1 on the inner side and is visible through the outer transparent resin layer 2, so that it does not peel off or be damaged, It has the advantage that a beautiful state is maintained. Furthermore, since the color pattern can be changed immediately by simply changing the setting of the laser light irradiation conditions, products with various color patterns according to needs can be delivered in a short period of time. Has the advantage of being able to

In the above example, as the colored resin material for forming the colored resin layer 1, generally, a resin material in which a colorant such as a pigment or a dye is blended is used. When the resin itself is opaque and has some color, the resin itself can be used as the “colored resin material”. As the resin component of such a resin material, polyethylene (PE), the polyolefin emissions of polypropylene (PP) and the like. These may be used alone or in combination of two or more. The PE, polyolefin such as PP are suitable in the moldability and colorability.

  The color of the colored resin layer 1 is preferably such that the contrast with the color of the burnt mark P when it is burned by laser light irradiation becomes clear, for example, its brightness is 7-10. It is preferable that If the color of the colored resin layer 1 is in this range, white or very light color), in particular, the darkness of the color (dark color) of the burn mark P caused by laser light irradiation and the color of the colored resin layer 1 as the background. And the color pattern such as the character 3 can be clearly seen. In addition, it is preferable to adjust the irradiation condition of the laser beam so that the color of the burn mark P, that is, the color of the color pattern, is dark to black with a lightness of 0 to 6.

  Moreover, when the brightness of the color of the colored resin layer 1 is 0 to 6 from dark to black, both are adjusted so that the color of the burnt mark P due to laser light irradiation is light (for example, brightness 7 to 10). Therefore, the color pattern of the character 3 or the like can be clearly seen as in the above case.

On the other hand, the transparent resin material for forming the transparent resin layer 2 is preferably a thermoplastic resin and transparent, and the resin component of such a transparent resin material is acrylonitrile-butadiene-styrene resin ( ABS ). In addition, ionomer resins excellent in transparency and various physical properties are listed. These may be used alone or in combination of two or more. That is , it is preferable to use ABS or ionomer resin in terms of transparency and durability.

  And the transparency of the transparent resin layer 2 is preferably completely transparent in consideration of obtaining a clear color pattern, but even if it is translucent with somewhat reduced transparency, The colored resin layer 1 provided on the inside and the color pattern appearing on the surface may be visible from the outside. For example, a soft impression can be given to the whole by intentionally making the transparent resin layer 2 slightly translucent.

  Furthermore, the method for obtaining a two-layer blow-molded product is a method of forming a two-layer blow preform after forming a two-layer blow preform in addition to the method of directly blowing a two-layer parison as in the above example. You may do it. Moreover, after obtaining the single layer blow bottle which consists only of the colored resin layer 1, you may make it into the blow bottle of a two-layer structure by coating a transparent resin material on the outer side, or carrying out in-mold molding. . Furthermore, after obtaining a single-layer blow bottle consisting only of the transparent resin layer 2, a colored resin layer 1 is formed on the inside by injecting a colored resin material to form a film, thereby forming a two-layer blow bottle. May be. These are also included in the “multilayer blow molded article” of the present invention.

  In addition, in the trunk | drum part which makes a color pattern appear, it is suitable to set the thickness of the said colored resin layer 1 to 0.2-2 mm, and to set the thickness of the said transparent resin layer 2 to 0.2-3 mm. It is. That is, when the thickness of each layer 1 and 2 is larger than the above range, the entire container becomes thick, and it is difficult to obtain the goodness of a blow molded product “thin and lightweight”, which is not preferable. On the other hand, if the thickness of the colored resin layer 1 is thinner than the above range, there is a possibility that the colored resin layer 1 is torn when attempting to obtain a clear burnt spot by laser light irradiation, and the thickness of the transparent resin layer 2. However, if it is thinner than the above range, there is a possibility that problems may occur in the durability and moldability of the blow molded product.

  In the above example, the color pattern that appears by laser light irradiation was the letter 3 indicating the brand name and the description 4. However, the color pattern may be a letter, an illustration, or a combination thereof. Various variations can appear.

  The irradiation with the laser beam can be performed by an Nd: YAG laser or the like conventionally used for glass processing or the like. And as a processing method by the irradiation of the laser beam, as in the above example, the two laser beams are irradiated from different directions so as to connect the intersections at predetermined positions on the surface of the colored resin layer 1, and sequentially A method of causing a desired color pattern to appear while moving on the surface is suitable. In addition, a method of optically converging a large number of laser beams to create a focal point and moving that portion, while irradiating the target position with two measurement laser beams and positioning the intersection as a target A method of irradiating laser light for processing may be used.

  The blow-molded product that is the subject of the present invention is not limited to a bottle-shaped cosmetic container as in the above example, but includes containers used in various fields such as food containers and chemical containers. . Moreover, it may be a blow-molded product used as a decorative product or a household item other than the container. The form is not limited to a relatively high-strength bottle, and any form may be used as long as it is blow-molded, such as a squeeze bottle, a tube, or a standing pouch.

  In the above example, the blow molded product was a two-layer blow molded product of the colored resin layer 1 and the transparent resin layer 2, but a gas barrier layer was further provided inside the colored resin layer 1, There may be a multilayer blow-molded product having three or more layers, such as one in which two or more transparent resin layers are laminated outside the colored resin layer 1. However, a feature of the present invention is that a color pattern is formed on the surface of the colored resin layer 1 provided inside the transparent resin layer 2 by laser light irradiation. And the colored resin layer 1 must be provided on the inside.

  FIG. 4 shows a perspective view of a cosmetic container according to another embodiment of the present invention. This cosmetic container has substantially the same configuration as the cosmetic container shown in FIG. 1, and the same reference numerals are given to the same parts, and the description thereof is omitted. However, the strip-shaped metal thin film layer 10 is formed in the part used as the background of the character 3 among the character 3 and the description 4 which are the color patterns displayed on the front of the trunk | drum part of this cosmetic container.

  More specifically, the metal thin film layer 10 is made of an aluminum thin film layer having a thickness of 0.04 μm, and has the same shape as the character 3 in a portion corresponding to the character 3 formed on the colored resin layer 1 inside the transparent resin layer 2. The watermark pattern 11 and the transparent resin layer 2 below the watermark pattern 11 and the transparent resin layer 2 under the watermark pattern 11 are visible so that the character 3 formed on the colored resin layer 1 can be seen.

  The cosmetic container can be obtained, for example, as follows.

  That is, first, similarly to the cosmetic container shown in FIG. 1, a colored resin material for forming the inner colored resin layer 1 and a transparent resin material for forming the outer transparent resin layer 2 are prepared. Two types of resins are coextruded to form a parison in which two layers are laminated. Then, the parison is mounted on a blow mold and blow-molded to obtain a bottle-shaped molded product as shown in FIG.

  Next, the band-shaped metal thin film layer 10 is formed by mirror printing on the upper part of the front of the body part of the molded product. And as shown to Fig.5 (a), it irradiates with a laser beam from two directions toward the trunk | drum front part of the said bottle-shaped molded article, and in the upper part of a trunk | drum, the said metal thin film layer 10 and transparent The resin layer 2 is passed through and moved to the position on the surface of the colored resin layer 1 on the inner side where the character 3 is to be applied while adjusting the focal length.

  As a result, as shown in FIG. 5B, first, the metal thin film layer 10 where the laser beam passes is removed, and the laser beam further advances from the removal trace and passes through the transparent resin layer 2. The colored resin layer 1 is reached. Then, the resin of the surface of the colored resin layer 1 where the focal length of the laser beam is in the scorch burns, and a dark gray scorch mark P is formed in a limited region that becomes the irradiation trajectory of the laser beam. A character 3 as shown in FIG. 4 appears on the surface of the colored resin layer 1, more precisely, on the interface between the colored resin layer 1 and the transparent resin layer 2. In addition, with the irradiation of the laser light, the metal thin film layer 10 corresponding to the irradiation locus is removed, so that the watermark pattern 11 having the same shape as the burn mark P is formed on the metal thin film layer 10.

  In FIG. 5A, the thickness of each layer is exaggerated, so that the focus position on the surface of the colored resin layer 1 by the laser beam (the portion where the burn mark P is formed) and the metal thin film layer are shown. Although it seems that the position of the laser beam passing through 10 (the part to be removed) is deviated, in reality, since the thickness of each layer is very thin, it can be said that the positions of both layers are exactly overlapped. The pattern and the watermark pattern 11 formed on the metal thin film layer 10 can be said to have the same shape.

  On the other hand, in the lower part of the body part of the bottle-shaped molded product, as in the case of FIG. 1, the focal length of the surface of the colored resin layer 1 is increased by the laser light that has passed through the transparent resin layer 2 of the body part. As shown in FIG. 4, a dark gray scorch mark P is formed in a limited region that becomes an irradiation trajectory of laser light, and the resin at the joined portion is scorched, and at the interface between the colored resin layer 1 and the transparent resin layer 2. An explanatory note 4 appears.

  Note that the laser light irradiation conditions for causing the characters 3 and the description 4 to appear are controlled in accordance with a program inputted in advance as in the case of the cosmetic container of FIG.

  The cosmetic container of FIG. 4 obtained in this way is clearly provided with a color pattern composed of characters 3 and explanations 4 on the front surface of the body, and there is no deviation or distortion in line width or arrangement. Not only is the appearance of the character 3 good, but the contents of the explanatory note 4 consisting of a series of fine characters are easy to read.

  In the color pattern, the character 3 portion is seen through the watermark pattern 11 of the metal thin film layer 10 provided on the background and the transparent resin layer 2 inside the metal thin film layer 10. Not only does it give a gorgeous impression, but the character 3 is more impressive as it looks like a three-dimensional pattern with a depth as if it were deeply carved into a metal part.

  Moreover, the said color pattern has the advantage that the beautiful state is maintained over a long term, without peeling off and being damaged like the color pattern in the cosmetic container of FIG. Furthermore, since the color pattern can be changed immediately by simply changing the setting of the laser light irradiation conditions, products with various color patterns according to needs can be delivered in a short period of time. Has the advantage of being able to

  In the above example, the metal thin film layer 10 is an aluminum thin film layer formed by mirror printing, but the type of metal is not limited to aluminum but may be stainless steel or the like. The forming method includes mirror printing, metal foil transfer, vapor deposition, sputtering, hot stamping, and the like.

  Moreover, it is suitable for the thickness of the said metal thin film layer 10 to set to 0.02-0.1 micrometer not only in said example. That is, if the thickness of the metal thin film layer 10 is larger than the above range, the removal by laser irradiation cannot be performed smoothly in a short time, the production efficiency is deteriorated, and the removal portion of the metal thin film layer 10 is not removed. This is because there is a possibility that a fine step is generated between the portions or between the portion where the metal thin film layer 10 is formed and the portion where the metal thin film layer 10 is not formed, thereby impairing the smoothness of the container surface. Conversely, if the thickness of the metal thin film layer 10 is thinner than the above range, it may be difficult to form the metal thin film layer 10 on the surface of the molded product, which is not preferable.

  And the said metal thin film layer 10 may be formed in the whole surface other than forming in the limited part of the molded article surface like said example. That is, it can be formed in an appropriate region according to the balance with the color pattern such as the character 3 and the explanatory note 4 and the overall design.

  In the above example, since the formation of the burn mark P on the surface of the colored resin layer and the removal processing of the metal thin film layer 10 in front of it are simultaneously performed by laser light irradiation, the laser light to be used is the removal processing for the metal. It must be excellent in performance. As such a laser, an Nd: YAG laser is suitable.

  Further, in the above example, the color of the colored resin layer 1 may be a color that makes clear the contrast with the color of the burn mark P when it is burned by laser light irradiation, as in the above example. preferable. In other words, the color impression of the burnt mark P, that is, the color of the color pattern, and the color of the colored resin layer 1 that is the background color of the entire container are weak in visual impression, so that the visual impression is weak. However, when the metal thin film layer 10 is formed on the entire surface of the container, the color of the ground of the container, that is, the color of the colored resin layer 1 is not visible from the outside. It is preferable to select the color of the colored resin layer 1 so that the contrast with the gloss color of the metal thin film layer 10 becomes clear.

  INDUSTRIAL APPLICABILITY The present invention can be used for a method for producing a patterned blow molded product to which a clear color pattern (including letters and the like) that is not easily peeled off is applied, and a patterned blow molded product obtained thereby.

1 Colored resin layer 2 Transparent resin layer 3 Character 4 Description

Claims (8)

A step of preparing a multilayer blow-molded product in which a colored resin layer made of polyolefin resin is formed on the inside and a transparent resin layer made of acrylonitrile-butadiene-styrene resin or ionomer resin is formed on the outside; By irradiating laser light from the outside, passing through the transparent resin layer and reaching the colored resin layer surface, and moving the irradiation position along the colored resin layer surface sequentially, the colored resin layer surface, And a step of revealing a color pattern comprising a laser beam irradiation locus, wherein the color pattern is shown through the transparent resin layer. A step of preparing a multilayer blow-molded product in which a colored resin layer made of polyolefin resin is formed on the inside and a transparent resin layer made of acrylonitrile-butadiene-styrene resin or ionomer resin is formed on the outside; A step of forming a metal thin film layer on at least a part of the surface, and irradiating a laser beam from the outside of the metal thin film layer, removing the metal thin film layer, and passing the transparent resin layer from the removed trace to give a colored resin By reaching the surface of the layer and sequentially moving the irradiation position along the surface of the colored resin layer, a watermark pattern consisting of a laser beam irradiation locus is formed on the metal thin film layer, and the surface of the colored resin layer And a step of revealing a color pattern composed of an irradiation locus of laser light, wherein the color pattern on the surface of the colored resin layer is represented by the metal thin film layer. Preparation of textured blow-molded article, characterized in that as show watermark watermarks and the transparent resin layer.   The multilayer blow-molded product in which the thickness of the colored resin layer at least in the portion irradiated with the laser light is set to 0.2 to 2 mm and the thickness of the transparent resin layer is set to 0.2 to 3 mm is used. 2. A process for producing a patterned blow molded article according to 2. A blow molded article with a pattern obtained by the manufacturing method according to claim 1, wherein a colored resin layer made of polyolefin resin is formed on the inner side, and a transparent resin layer made of acrylonitrile-butadiene-styrene resin or ionomer resin is formed on the outer side. It is made of a multilayer blow molded product, and the colored resin layer surface is given a color pattern consisting of an irradiation locus of laser light, and the color pattern is visible through the transparent resin layer Blow molded product with a pattern characterized by A blow molded article with a pattern obtained by the manufacturing method according to claim 2, wherein a colored resin layer made of polyolefin resin is formed on the inner side, and a transparent resin layer made of acrylonitrile-butadiene-styrene resin or ionomer resin is formed on the outer side. A metal thin film layer is formed on at least a part of the surface of the multilayer blow molded product, and a watermark pattern comprising a laser beam irradiation locus is formed on the metal thin film layer, and the colored resin The surface of the layer is provided with a color pattern consisting of a laser beam irradiation locus, and the color pattern of the colored resin layer surface can be seen through the watermark pattern of the metal thin film layer and the transparent resin layer. A blow molded product with a pattern characterized by   The thickness of the colored resin layer in the portion to which at least the color pattern comprising the irradiation locus of the laser beam is applied is set to 0.2 to 2 mm, and the thickness of the transparent resin layer is set to 0.2 to 3 mm. 5. A blow molded article with a pattern according to 5.   The lightness of the colored resin layer (Munsell value according to Munsell color system, hereinafter the same) is 7 to 10, and the lightness of the color pattern is 0 to 6. The textured pattern according to any one of claims 4 to 6. Blow molded product.   The lightness of the said colored resin layer is 0-6, The brightness of a color pattern is 7-10, The blow molded article with a pattern as described in any one of Claims 4-6.

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