JPH0958108A - Transfer printing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to transfer ink to a boundary between the surface to be printed and a protruding part by forming a predetermined round at the boundary between the protruding part of a molding and a protruding adjacent surface, and providing a layer having specific ASKER hardness scale in a pad in the transfer of the ink by pressing the pad. SOLUTION: A round of 0.5R or more, e.g. 0.5 to 1.5R is provided at the boundary 1a between the rising wall 2 of a molding 1 and the rising wall adjacent surface 3 in the case where the thickness of the wall 2 is 2.0mm and the thickness of the surface 3 is 2.0mm. A pad 4 is formed in a two-layer structure, the layer 4a of the side to which ink is applied is slightly soft as compared with a layer 4b to be superposed thereon, and a predetermined round R is formed at the end edge 4c. The layers 4a, 4b use silicone material such as material that curing agent is kneaded with silicone oil and solidified in a mold. The ASKER hardness scale of the layer 4a is 20 deg. or less, and the ASKER hardness scale of the layer 4b is 25 to 35 deg..

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various molded products in which a protruding portion such as a standing wall is formed, for example, a surface adjacent to a standing wall of an outer lens of a rear combination lamp of an automobile, particularly sandwiched between standing walls, or The present invention relates to a transfer printing method suitable for transfer printing on a plane surrounded by standing walls.

[0002]

2. Description of the Related Art In various molded articles for vehicles, for example, outer lenses of rear combination lamps of automobiles,
A through hole may be provided for inserting a key for opening and closing the key cylinder for locking the trunk lid. In such a case, leg portions (standing walls) for sealing or reinforcement are provided around the through holes.

FIGS. 5 and 6 are views showing an example thereof. In these figures, 51 is a housing, 52 is an outer lens, 53 is an inner lens, and 54 is a key cylinder. Further, 55 is a through hole for inserting a key cylinder provided in the housing 51, 56 is a seal recess provided all around the through hole 55, and 57 is a seal provided all around the rear opening of the outer lens 52. A leg portion (standing wall), 58 is a through hole for inserting a key provided in the outer lens 52, 59 is a seal leg portion (standing wall) provided over the entire circumference of the through hole 58, and 60 is inside the through hole 58. Is a peripheral portion, 61 is a trunk lid, and 62 is a lamp chamber in which a light source (not shown) is provided.

In such a rear combination lamp structure, when water, particularly muddy water enters between the peripheral portion 60 inside the through hole 58 for key insertion and the key cylinder 54 and dries, the peripheral portion 60 becomes dirty ( (Refer to the lattice pattern in FIG. 6), but it is seen through from the outside of the inner lens 2, which impairs the appearance. Therefore, it has been considered that the peripheral edge portion 60 is subjected to a designing process such as coloring (coloring) and patterning from the beginning to make stains on the peripheral edge portion 60 inconspicuous.

Conventionally, a mask coating method has been used as a method of the above design treatment. In this method, a non-painted portion is masked with a tape or the like, and then colored painting is performed by spraying or the like, and then the tape or the like is removed, and only a necessary portion, here, the peripheral portion 60 is colored and painted.

However, in such a mask coating method,
(1) Many man-hours are required, (2) Mask jig is required, (3) Man-hours are required for mask replacement and cleaning, (4) Drying process is required, (5) Manufacturing cost is high,
(6) There is a problem in that the coating appearance quality varies.

Therefore, recently, transfer printing (tampo printing)
Methods have been used. This is a single layer type pad having a hardness (asker hardness, the same applies hereinafter) of 30 ° or more,
A shape obtained by inverting the shape of the surface of the molded product to be subjected to the design treatment and its peripheral portion, for example, in the case of the coloring treatment of the peripheral portion 60 in FIG. 5, prepare a substantially cylindrical pad, and attach the pad to the tip end surface of the pad. This is a method of adhering ink and pressing and transferring it on the peripheral portion 60.

[0008]

However, the conventional transfer printing method described above has the following problems. Figure 7
In the conventional transfer printing method, the pad 71 is the molded product 7.
2 shows a state in which the print surface 73 is pressed and pressed, but conventionally, in this state, the air at the boundary portion (standing wall corner portion) 75 between the print surface 73 and the standing wall 74 escapes. The pad 71 could not follow the partial shape. Therefore, the transfer leakage portion 7 in which the ink is not transferred to the portion 75
6 (see FIG. 8) occurs, and there is a problem that smooth automatic printing processing continuous to the molding process, cost reduction, and stabilization of printing quality are obstacles. In FIG. 8, reference numeral 77 indicates an ink transfer film on which the ink is transferred.

The object of the present invention is to enable transfer to a boundary portion (projection corner portion) between a surface to be printed and a projection such as a standing wall, which enables smooth automatic printing processing which is continuous to the molding process and cost. It is an object of the present invention to provide a transfer printing method capable of achieving reduction and stabilization of print quality.

[0010]

Means for Solving the Problems The above-mentioned object is to press a pad having an ink adhered to the tip surface against a surface adjacent to a protruding portion of a molded product in which a protruding portion such as a standing wall is formed. In the transfer printing method of transferring the ink to the surface adjacent to the projection, a predetermined R is provided at the boundary between the projection of the molded product and the surface adjacent to the projection.
(Rounding), and the pad is provided with a layer having an Asuka hardness of 20 ° or less on at least the ink-adhering side, and a predetermined R (roundness) is attached to the tip edge portion thereof. It

The transferability is improved because the boundary (the corner of the protrusion) between the protrusion of the molded product and the surface adjacent to the protrusion is rounded. Further, since the pad has a layer having an Asuka hardness of 20 ° or less on at least the side to which the ink is attached, and a predetermined R (roundness) is attached to the tip edge portion thereof, the standing wall at the time of ink transfer is described. Air escape at the corners is improved, the conformability to the shape of the part is improved, the ink is sufficiently transferred to the part, and the occurrence of the transfer leakage part is eliminated. According to this, a smooth automatic printing process continuous to the molding process, cost reduction, stabilization of printing quality, etc. are realized. The numerical value of the Asuka hardness of 20 ° or less is obtained by the inventor's earnest research and experimental results.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of an embodiment of a transfer printing method according to the present invention. In FIG. 1, 1 is a molded product in which a standing wall 2 is formed, 3 is a surface adjacent to a standing wall which is a surface to be printed of the molded product 1, 4 is a pad, 5 is a screen, 6 is an acrylic or urethane ink. , 7 are receiving jigs for holding and fixing the molded product 1.

Here, in the boundary portion (standing wall corner portion) 1a between the standing wall 2 and the standing wall adjacent surface 3 of the molded product 1, the standing wall 2 has a thickness of 2.0 mm, and the standing wall adjacent surface 3 portion has a thickness of 2.0 mm. Thickness 2.0
In the case of mm, R (roundness) of 0.5R or more, for example, 0.5 to 1.5R is attached (see FIG. 2). If R (roundness) exceeds 1.5R, so-called sink mark distortion occurs during molding, so 1.5R at maximum is desirable.

The pad 4 is, as shown in FIG.
A two-layer structure is formed in the thickness direction, of which the layer (first layer) 4a on the side to which the ink 6 is attached overlaps this layer (second layer).
The layer) 4b has a slightly softer hardness, and the tip edge 4c thereof has a predetermined R (roundness). For example, the first layer 4a and the second layer 4b are both made of a silicon material, for example, a silicone oil, which is obtained by kneading a curing agent and solidifying in a molding die.
The hardness of a is 20 ° or less, and the hardness of the second layer 4b is 25 to 35.
And the thickness (vertical dimension in the figure) of the first layer 4a:
Second layer 4b = (1/3) :( 2/3) to (1/2):
The one manufactured by the combination of (1/2) is used. Also, the pad 4 is a surface 3 adjacent to the standing wall, which is the surface to be printed of the molded product 1.
And a shape in which the shape of the peripheral portion is inverted, that is, a shape in which at least the tip edge portion 4c is rounded. In this case, the size of the entire pad 4 and R
The value is selected according to the amount of bending of the pad 4. The above hardness is Asuka hardness. Next, the transfer printing process by the method of the present invention will be described. As shown in FIG. 1, first, a molded article 1 having a standing wall 2 is held and fixed to a receiving jig 7 with a standing wall adjacent surface 3 which is a surface to be printed facing upward. To do. In this state, the pad 4 first descends from above the position of the ink 6 and deposits the ink 6 on the tip surface (lower end surface in the figure) of the pad 4. After that, the pad 4 moves up, moves in the horizontal direction, stops right above the standing wall adjoining surface 3, and then descends, pressing the tip surface to which the ink 6 adheres to the standing wall adjoining surface 3, The pressure is applied to transfer the ink 6 to the surface 3 adjacent to the standing wall. After that, the pad 4 rises, moves in the horizontal direction, and stops right above the ink 6. With the above, the transfer printing process for one molded product 1 is completed, and thereafter, the same process as described above (in the figure, a → ro → ha → d → h → h → t → h → ch → a) After the pad 4 is moved, transfer printing is performed for each molded product 1 that is sequentially sent after molding.

Here, in a boundary portion (standing wall corner portion) 1a between the standing wall 2 and the standing wall adjacent surface 3 of the molded product 1, 0.5 R or more, for example, 0.5 to 1.5 R R (roundness). ) The transferability is improved because it is attached. As described above, the pad 4 is provided with a layer (first layer) 4a having an Asuka hardness of 20 ° or less on the side to which the ink 6 is attached, and is provided with a predetermined R (roundness) on the tip edge portion 4c. As a result, the air at the corners 1a of the standing wall during the transfer of the ink escapes better, and the conformability to the partial shape is improved.
The ink 6 is sufficiently transferred to the a, and the transfer leakage portion 76
(See FIG. 8) does not occur. FIG. 4 shows this state, and the ink transfer film 8 is formed so as to cover the entire surface of the standing wall adjacent surface 3 which is the surface to be printed of the molded product 1.

By appropriately setting various transfer conditions such as the amount of pressure applied to the surface 3 adjacent to the standing wall of the pad 4, the amount of bending of the pad 4 and the transfer speed, the molded product 1 having the standing wall 2 is formed. Transfer printing can be fully performed on the surface 3 adjacent to the standing wall, which is the surface to be printed.

In the above-described embodiment, the case where the pad 4 is formed in a two-layer structure in the thickness direction has been described, but at least the side to which the ink 6 is attached is provided with a layer having an Asuka hardness of 20 ° or less, and the tip edge thereof. The part 4c may have a single-layer structure or a structure having three or more layers, as long as it is formed in a shape with R (rounded).

[0018]

As described above, according to the present invention, in the transfer printing method of the surface adjacent to the protruding portion of the molded article having the protruding portion, the boundary between the protruding portion and the surface adjacent to the protruding portion. Predetermined R (roundness) is applied to the portion (corner of the protruding portion), and the pad has at least the Asuka hardness of 20 on the side to which the ink is attached.
Since it is provided with a layer of ≤ °, and a predetermined R (roundness) is attached to the edge of the tip, transfer to the corner of the protrusion is also possible, and a smooth automatic printing process continuous to the molding process, There are effects such as cost reduction and stabilization of print quality.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of a transfer printing method according to the present invention.

FIG. 2 is an enlarged view of a main part of the molded product in FIG.

FIG. 3 is an explanatory diagram of a structure of a pad in FIG.

FIG. 4 is a diagram showing an ink transfer film according to the method of the present invention.

FIG. 5 is a partial cross-sectional view of a rear combination lamp in which a through hole for inserting a key is provided in the outer lens.

6 is a view seen from the direction of arrow A in FIG.

FIG. 7 is an explanatory diagram of a conventional transfer printing method.

FIG. 8 is a diagram showing an ink transfer film according to a conventional method.

[Explanation of symbols]

1, 72 ... Molded product, 1a, 75 ... Boundary portion between standing wall and standing wall adjoining surface (standing wall corner), 2, 74 ... Standing wall (projection), 3, 73 ... Standing wall adjacent surface ( Printed side), 4,71
... Pad, 4a ... Pad first layer, 4b ... Pad second layer,
5 ... Screen, 6 ... Ink, 7 ... Receiving jig, 8, 77
... Ink transfer film, 76 ... Transfer leakage part.

Claims (1)

[Claims] 1. A transfer printing method in which a pad having ink adhered to a front end surface is pressed against a surface adjacent to the protrusion of a molded article having the protrusion, and the ink is transferred to the surface adjacent to the protrusion. In the above-mentioned molded article, a predetermined R is applied to the boundary between the protrusion and the surface adjacent to the protrusion, and the pad has a layer having an Aska hardness of 20 ° or less on at least the ink-adhering side. Predetermined R on the tip edge
A transfer printing method characterized by being attached.