JP2007320158A - Method for forming unevenness on surface of synthetic resin molded article and synthetic resin molded article with decorated surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for forming easily an uneven pattern on the surface of a synthetic resin molded article by after-processing, and in particular, to provide a molded article with the surface decorated by the uneven pattern of various variations. <P>SOLUTION: In the method for forming the unevenness on the surface of the molded article made of a synthetic resin, a printing plate on the surface of which a specified uneven pattern is formed is used. The surface of the synthetic resin molded article is pressed by this printing plate to deform the synthetic resin on the surface of the molded article along the unevenness of the printing plate, and to form the uneven pattern corresponding to this uneven pattern on the surface of the molded article. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for forming a concavo-convex pattern on the surface of a synthetic resin molded article by post-processing.

As a method for forming a concavo-convex pattern on the surface of a molded product for the purpose of exhibiting functions such as decoration of a synthetic resin molded product and anti-slip, an injection molding metal has been conventionally used as described in Patent Document 1, for example. There is a method in which a concavo-convex pattern provided on a molding surface of a mold is transferred to a molded product surface simultaneously with injection molding of the molded product.
JP 2003-320555 A

The method of forming the concavo-convex pattern on the surface of the molded product by using the concavo-convex pattern provided on the molding surface of the injection mold described above can form the concavo-convex pattern simultaneously with molding, and the productivity and reproducibility of the concavo-convex pattern This is an excellent method.
However, on the other hand, for example, when changing from one pattern to various variations, it is necessary to remake the mold, which is difficult in terms of delivery time and cost, and there is a method that can easily change the pattern. is needed.

  Therefore, the present invention aims to provide a method for easily forming a concavo-convex pattern on the surface of a synthetic resin molded product by post-processing, and particularly provides a molded product whose surface is decorated with various concavo-convex patterns. For the purpose.

Among the present invention for solving the above technical problems, the method of the invention according to claim 1 comprises:
A method for forming irregularities on the surface of a molded product made of synthetic resin,
Using a plate with a predetermined uneven pattern on the surface,
Press the surface of the synthetic resin molded product with this plate,
The synthetic resin on the surface of the molded product is deformed along the concave / convex pattern of the plate to form a concave / convex pattern corresponding to the concave / convex pattern on the surface of the molded product,
It is in.

According to the method of the first aspect, the uneven pattern can be easily formed on the surface of the synthetic resin molded product by post-processing.
And if you prepare plates with various variations of uneven patterns, you can provide products with the same molded product surface decorated with various variations of uneven patterns, and customers can also choose according to their preference .

  Moreover, even if a plate has the same uneven pattern, the surface of the molded product can be made shallower or deeper by controlling the heating temperature appropriately with the pressing force when the plate is heated. It can be transferred to a concave-convex pattern with various concave-convex depths.

In addition to the decorative function, the concave / convex pattern on the surface of the molded product can be partly formed in a transparent molded product, for example, by forming a large number of fine grooves to form a knurled shape and exhibit a function for preventing slippage. Various functions, such as roughening and adding haze, can be exhibited.
In particular, in the method of the present invention, by appropriately controlling the heating temperature and pressing force of the plate as described above, the uneven pattern can be formed shallowly, that is, delicately formed. Due to reflection or interference, an optical visual effect can be obtained which is not found in the method of forming a concavo-convex pattern simultaneously with molding by a conventional injection mold or the like.

The method according to claim 2 is the invention according to claim 1,
Press the surface of the molded product made of synthetic resin with the plate heated,
Softening the synthetic resin on the surface of the molded product and deforming it along the concavo-convex pattern to form a concavo-convex pattern corresponding to the concavo-convex pattern on the surface of the molded product,
It is in.

  The method according to claim 2, wherein the plate is heated to deform along the concavo-convex pattern in a state where the synthetic resin on the surface of the molded product is softened, and the concavo-convex pattern is formed deeper along the concavo-convex pattern of the plate. In addition, a concavo-convex pattern having a complicated shape can be transferred and formed with good reproducibility.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the surface of the molded product and the plate are pressed while the molded product is rotated about a predetermined axis, and the curve of the molded product is changed. Forming a concavo-convex pattern on the finished surface.

The unevenness forming method of the present invention can cope with various surface shapes such as a flat shape and a curved shape by appropriately selecting the shape of the plate (flat plate shape, curved shape, etc.) and the material,
According to the method of claim 2, even if the molded product has a curved surface shape, the molded product is rotated using an appropriate jig for rotating the molded product. However, by pressing the surface of the molded product and the plate, the uneven pattern can be smoothly formed on the curved surface.

  According to a fourth aspect of the present invention, there is provided a method according to the third aspect, wherein a plurality of fine circumferential grooves (7) are juxtaposed on a side peripheral wall (6) of a transparent cap-shaped cylindrical cap (5). To form in the shape.

  According to the method of claim 4, by pressing the surface of the molded product and the plate while rotating the cap around its central axis using an appropriate jig, a large number of the entire circumference of the side peripheral wall can be obtained. It is possible to smoothly form a knurled concave / convex pattern in which fine circumferential grooves are arranged in parallel.

By preparing a plate in which the groove width, cross-sectional shape, depth, and distance between adjacent grooves are variously prepared, a cap formed with knurled concavo-convex patterns of various variations can be provided.
Further, as described above, the groove depth can be controlled by the plate temperature and pressing force to form a delicate uneven pattern.

  In addition, by making the cap transparent, light is reflected according to the uneven pattern, and various shines can appear, and moreover, moire is caused by optical interference between the side walls. A pattern can also appear.

  According to a fifth aspect of the present invention, in the first, second or third aspect of the present invention, the surface of the molded product is pressed with a plate in a state where the hot stamp film for hot stamping is sandwiched, and an uneven pattern is formed on the surface of the molded product. And the decorative layer of the hot stamp film is transferred to the surface of the molded product while being superimposed on the uneven pattern.

  The basic structure of a hot stamp film is a laminate of a base film made of polyethylene terephthalate resin or the like and a decorative layer such as a printed layer, a metal vapor deposition layer, or a metal foil layer. The hot stamp film has a predetermined pattern. When the plate on which the film is formed is heated and pressed onto the surface of the molded product (commonly referred to as a hot stamp method), a part of the laminated decorative layer is thermally transferred to the molded surface.

  And by the said method of Claim 5, in the state which pinched | interposed the hot stamp film which has decoration layers, such as a printing layer, a metal vapor deposition layer, and a metal foil layer, it shape | molds by pressing the surface of a molded article with a plate. While forming a concavo-convex pattern on the surface of the product, it is possible to transfer the decorative layer so as to overlap the concavo-convex pattern, and to exhibit a higher degree of decoration.

  According to the above method, the decorative layer is basically transferred to the portion of the concavo-convex pattern on the surface of the molded product where the pressing force of the plate is sufficiently applied. It becomes a combination of decoration layers and can exhibit a unique decoration effect. In particular, it is possible to exhibit an unprecedented decoration effect by combining a delicate uneven pattern with a pattern of a delicate decoration layer.

The invention according to claim 6 is related to a synthetic resin molded product with surface decoration, and the means of the invention according to claim 6 includes:
In a molded article having a cylindrical side peripheral wall,
On the surface of this side peripheral wall, a number of fine circumferential grooves are juxtaposed to form a knurled concave / convex pattern, and the decorative layer of the hot stamp film for hot stamping is transferred over this concave / convex pattern,
It is in.

  In the molded product having a cylindrical side peripheral wall, such as a cap, with the above-described configuration according to claim 6, various variations of the uneven pattern are formed on the surface of the side peripheral wall by the peripheral groove, and the entire region of the uneven pattern, or The decorative layer can be transferred onto the portion, and an unprecedented decorative effect can be exhibited.

  In addition, in a transparent molded product, light is reflected according to the uneven pattern of the circumferential groove and various shines can appear, and furthermore, moire patterns are created by optical interference between the side walls. Can also appear.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the invention of claim 1, the uneven pattern can be easily formed by post-processing on the surface of the synthetic resin molded product, and the same molded product surface is decorated with various variations of the uneven pattern. Products can be provided and customers can choose according to their preferences.

  In addition, even if a plate has the same uneven pattern, the uneven pattern is made shallower or deeper by appropriately controlling the heating temperature together with the pressing force when the plate is heated. It can be transferred to the surface, and can be a concavo-convex pattern with various concavo-convex depths.

  It is possible to form the concave / convex pattern shallowly, that is, delicately, and the concave / convex pattern is formed at the same time as molding with a conventional injection mold or the like due to light reflection or interference due to the delicate irregularities on the surface. Provides optical visual effects not found in the method.

  In the invention of claim 2, the heated plate is used to deform along the concavo-convex pattern in a state where the synthetic resin on the surface of the molded product is softened, and deeper along the concavo-convex pattern of the plate. A concavo-convex pattern can be formed, and a concavo-convex pattern having a complicated shape can be transferred and formed with good reproducibility.

  In the invention of claim 3, even if the molded product has a curved surface shape, the molded product is rotated by using an appropriate jig for rotating the molded product. An uneven pattern can be smoothly formed on the curved surface by pressing the surface of the molded product and the plate while moving.

  In the invention of claim 4, by pressing the surface of the molded product and the plate while rotating the cap around its central axis using an appropriate jig, over the entire circumference of the side peripheral wall, A knurled uneven pattern in which a large number of fine circumferential grooves are juxtaposed can be formed smoothly.

  In addition, by making the cap transparent, light is reflected according to the uneven pattern, and various shines can appear, and further, moire is caused by optical interference between the side walls. A pattern can also appear.

  In invention of Claim 5, while forming an unevenness | corrugation on the molded article surface, a decoration layer can be transcribe | transferred on this uneven | corrugated pattern, and decorating property can be exhibited more highly. In particular, it is possible to exhibit an unprecedented decoration effect by combining a delicate uneven pattern with a pattern of a delicate decoration layer.

  In the invention according to claim 6, in the molded product having a cylindrical side peripheral wall such as a cap, the uneven groove of various variations is formed on the surface of the side peripheral wall by the peripheral groove, and the entire region of the uneven pattern Alternatively, the decorative layer can be transferred over the portion, and a molded product having an unprecedented decorative effect can be obtained.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the accompanying drawings.
FIG. 1 explains a first embodiment of the unevenness forming method of the present invention, and is a schematic explanatory view showing the molded product 1 and the heated plate 11 in the vicinity of the surface in an enlarged and longitudinal direction.
FIG. 1 (a) shows a state immediately before pressing a plate 11 having an uneven pattern formed in parallel with a large number of thin triangular grooves 14a having a triangular cross-sectional shape on the surface thereof, on a synthetic resin molded product 1. FIG. 1B shows a state in which the surface of the molded product 1 is pressed with the plate 11, and FIG. 1C shows an uneven pattern formed on the surface of the molded product 1 after the plate 11 is removed.

When the surface of the molded product 1 is pressed with the heated plate 11, heat is transmitted from the contact portion, the synthetic resin is softened near the surface of the contact portion, and the tip portion of the plate 11 is fitted into the surface of the molded product 1, In the peripheral portion, the resin in the inserted region is deformed, and the bead portion 3 is formed so as to rise in the gap of the recess 2. (See Fig. 1 (b))
Here, in the example of FIG. 1B, the pressing force of the plate 11 is adjusted, and the plate 11 is pushed down to a depth of about 1/4 of the triangular narrow groove 14a and stopped there.

Then, when the plate 11 is removed, a concavo-convex pattern having a cross-sectional shape in which the bead portions 3 are formed on both sides of the concave portion 2 is formed on the surface of the molded product as shown in FIG. Thus, even if the same plate 11 is used, the transfer depth of the uneven pattern of the plate 11 onto the surface of the molded product 1 can be controlled by the temperature and pressing force of the plate 11.
In the case of the present embodiment, using the plate 11 in which the width W1 of the triangular narrow groove 14a is 1 mm and the groove depth d1 is 0.5 mm, the width W2 is about 0.2 mm and the groove depth d2 on the surface of the molded product 1. Could form a triangular thin groove 4a having a thickness of about 0.1 mm.
Here, in the present embodiment, the pressing force of the plate 11 is adjusted as described above, and the plate 11 is pushed to a depth of approximately 1/4 of the triangular narrow groove 14a and stopped there. In the embodiment, since a heated plate is used, the shape of the triangular fine groove 14a can be formed as it is on the surface of the molded product 1 by pushing the plate 11 to the full depth of the triangular fine groove 14a according to the purpose.

Next, FIG. 2 shows a second embodiment of the unevenness forming method of the present invention. In the plate 11 heated by sandwiching a hot stamp film 21 in which a printing layer is laminated as a decorative layer 22 on a base film 21a. It is a schematic explanatory drawing which expands and longitudinally cuts the surface vicinity of the molded product 1 and the plate 11 as an example of forming irregularities by pressing one surface of the molded product.
Among these, FIG. 2A shows a state in which the hot stamp film 21 is sandwiched and immediately before the heated plate 11 in which a thin rectangular narrow groove 14b having a rectangular cross section is formed on the synthetic resin molded product 1 is pressed. FIG. 2B shows the uneven pattern formed on the surface of the molded product 1 after the plate 11 is removed.

  Then, the concave / convex pattern formed by the rectangular narrow grooves 14b is transferred to the surface of the molded product 1 with a depth of about 1/3 by this plate, and the concave portions of the rectangular narrow grooves 4b formed on the surface of the molded product 1 are also transferred. The decorative layer 22 of the hot stamp film 21 is transferred to the portion from the bottom part 2 to the bead part 3, and the printing layer overlaps a part of the concavo-convex pattern, so that an unprecedented decorative effect is exhibited.

If the hot stamped film 21 in which a vapor-deposited layer having a metallic luster or a metal foil layer is used as the decorative layer 22 instead of the printing layer is used, the decorative layer 22 having the metallic luster overlaps with a part of the concavo-convex pattern, This also exhibits an unprecedented decorative effect.
Also in the second embodiment, as in the first embodiment, the plate 11 is pushed to the full depth of the rectangular narrow groove 14b to correspond to the shape of the rectangular thin groove 14b of the plate 11 on the surface of the molded product 1. A rectangular narrow groove 4b having a depth can be formed, and in this case, a pressing force acts on the entire surface of the hot stamping film 21, so that the entire region of the uneven pattern on the surface of the molded product 1 is decorated. Layer 22 is transferred.

Next, FIG. 3 shows a third embodiment of the unevenness forming method of the present invention and an embodiment of a synthetic resin molded product with surface decoration of the present invention produced by this method, and is a transparent synthetic resin. It is a schematic explanatory drawing about the method of forming the uneven | corrugated pattern which consists of many thin circumferential grooves 7 over the perimeter of the side peripheral wall 6 surface of the cap 5 made from a metal.
As shown in FIG. 3A or 3B, a cap-like cylindrical cap 5 is externally fitted and fixed to a rotation fixing jig 16, and the rotation fixing jig 16 allows the cap 5 to move around a center axis. While being rotated at a speed, the plate 11 is moved in parallel at the same speed as the peripheral speed of the cap 5 while being pressed against the side peripheral wall 6 with a predetermined pressing force.

  The plate 11 of this embodiment is formed by engraving a large number of triangular narrow grooves 14a similar to the plate 11 shown in FIG. 1 on the surface, and is schematically shown in FIGS. 3 (a) and 3 (b). Through the process, a large number of thin circumferential grooves 7 having the cross-sectional shape shown in FIG. 1C can be smoothly formed over the entire circumference of the side circumferential surface 6 in a knurled shape.

And since this cap 5 is a transparent molded product, by making the cross-sectional shape of the delicate circumferential groove 7 various variations, the optical decoration effect of various aspects can be achieved by reflection and interference of each light. It can be demonstrated. Moreover, a moire pattern appears by optical interference between the opposing side peripheral walls 6, and an interesting decoration effect can be exhibited.
In addition, although the example of using the flat plate 11 was shown in the method of the above-described third embodiment, a curved plate partially extending along the shape of the molded product is used depending on the shape of the uneven pattern. This makes it possible to transfer the uneven pattern more smoothly.

As mentioned above, although embodiment concerning the uneven | corrugated formation method of this invention and its effect were demonstrated along the Example, this invention is not limited to the said Example.
The concavo-convex pattern according to the method of the present invention is not limited to the linear narrow groove shape described in the embodiment, and various patterns can be adopted by taking advantage of post-processing, for example, patterns, designs, characters Alternatively, a concavo-convex pattern combining these can also be formed.

  In addition, as shown in the second embodiment, it is possible to combine a concave / convex pattern and a decorative layer of various forms by printing with a hot stamp film or metal vapor deposition, etc. Can be expanded.

  As described above, the method for forming irregularities on the surface of the synthetic resin molded article of the present invention can easily form irregular patterns of various aspects by post-processing, and can also be combined with a decorating method by hot stamping. As a method for decorating the surface of a molded product, it can exhibit an unprecedented decorative effect, and application of various molded products as a surface decoration method is expected.

It is a schematic explanatory drawing which shows 1st Example of the uneven | corrugated formation method of this invention. It is a schematic explanatory drawing which shows 2nd Example of the uneven | corrugated formation method of this invention. (A) And (b) is schematic explanatory drawing which shows 3rd Example of the uneven | corrugated formation method of this invention, (a) is a schematic perspective view of the state which is pressing the side peripheral wall of a molded article with a plate, (b) FIG. 2 is a longitudinal sectional view of (a). Moreover, (c) is an example of a synthetic resin molded product with a surface decoration of the present invention, and is a perspective view of a cap formed with a concavo-convex pattern.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Molded article 2; Concave part 3; Bead part 4a; Triangular thin groove 4b; Rectangular thin groove 5; Cap 6; Side peripheral wall 7; Rotation fixing jig 21; Hot stamp film 21a; Base film 22;

Claims (6)

Using a plate (11) having a predetermined concavo-convex pattern formed on the surface, pressing the surface of the synthetic resin molded product (1) with the plate (11), the synthetic resin on the surface of the molded product (1) And forming a concavo-convex pattern corresponding to the concavo-convex pattern on the surface of the molded article (1). Pressing the surface of the synthetic resin molded article (1) with the plate (11) heated to soften the synthetic resin on the surface of the molded article (1) and deforming it along the concavo-convex pattern, the molded article (1) The method for forming irregularities on the surface of a synthetic resin molded product according to claim 1, wherein an irregular pattern corresponding to the irregular pattern is formed on the surface. While rotating the molded product (1) around a predetermined axis, press the surface of the molded product (1) and the plate (11) to form an uneven pattern on the curved surface of the molded product (1). The method for forming concavities and convexities on the surface of a synthetic resin molded product according to claim 1 or 2, wherein: The synthetic resin molding according to claim 3, characterized in that a large number of fine circumferential grooves (7) are juxtaposed on a side peripheral wall (6) of a transparent top cap (5) to form a knurled shape. Method for forming irregularities on the surface of the product While holding the hot stamp film (21) for hot stamping, press the surface of the molded product (1) with the plate (11) to form an uneven pattern on the surface of the molded product (1), and the hot stamp film ( 5. The uneven formation on the surface of the synthetic resin molded product according to claim 1, wherein the decorative layer (22) of 21) is transferred to the surface of the molded product (1) so as to overlap the uneven pattern. Method. On the surface of the side peripheral wall (6) of the molded product having a cylindrical side peripheral wall (6), a plurality of fine peripheral grooves (7) are juxtaposed to form a knurled concave-convex pattern and superimposed on the concave-convex pattern. A surface-decorated synthetic resin molded product, wherein the decorative layer (22) of the hot stamp film (21) for hot stamping is transferred.

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