JPS6159210B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for forming a long object having a decorative pattern on a group of irregularities on the surface, and more specifically, a method for forming a long object having a decorative pattern on the surface of the uneven surface. The present invention relates to a method for molding a long object that can form a desired decorative pattern on a group of projections and recesses.

(Prior art) Generally, in order to form a decorative pattern on the surface of a long object, a method is adopted in which a decorative film is attached to the molded object after molding. This method has disadvantages such as sagging and peeling of the film.

Therefore, in view of the fact that such defects were caused by forming a decorative pattern on the molded product after molding,
In order to eliminate this drawback, a method of forming a decorative pattern at the same time as molding of a molded article was proposed in Japanese Patent Laid-Open No. 49-
Technologies such as No. 105856 have been developed. That is, in this invention, a resin film is formed on the upper surface of the sheet, and a transfer sheet with printing on the film is attached or left stationary in a mold so that the surface of the sheet is in contact with the surface of the mold. After that, resin is injected into the mold to integrate the molded product and the transfer sheet, and then the molded product is taken out from the mold and the sheet is removed to obtain a molded product with a pattern formed on its surface.

However, in this molding method, the transfer sheet is attached so as to be in contact with the surface of the mold, and the molding and integration of the transfer sheet to the molded product are simultaneously performed inside the mold. If the object matches the dimensions of the mold, there will be no problem in molding or in attaching the transfer sheet, but if the object is long,
Due to the fact that the molding method for the molded product is fundamentally different, and the size of the transfer sheet must be a fixed size when attached so as to be in contact with the mold surface, the above method is not suitable. It was simply not possible to apply it directly to long molded products.

In other words, as a method for forming long objects, there is a method described in Japanese Patent Application Laid-Open No. 48-83150, but this method involves leaving a part of the unit molded in the mold in the mold. , by subsequent material injection, the subsequent molded single unit is connected and integrated with the single unit, and this process is repeated to mold a long molded item. Therefore, if a transfer sheet as described above is provided on the surface of the molded item. In this case, a transfer sheet must be attached to the mold every time the mold is opened and closed during single-piece molding, which significantly reduces work efficiency and completely eliminates the advantage of this method, which originally featured continuous molding. The Rukoto.

Moreover, even if such work were carried out, the transfer sheet of the above fixed size would be integrated into the long molded product in a spliced state, so the pattern would be formed intermittently and it would be difficult to offer it as a product. Become.

For these reasons, no suitable method for applying a decorative pattern to at least the surface has been developed so far.

In view of the above points, the present invention was developed as a molding method exclusively for long products having decorative patterns on the surface irregularities, and does not cause any hindrance to the continuous molding work of long products. A transfer film for applying a decorative pattern can be integrated into the molded product at the same time as the molding of the long product, and the decorative pattern can be reliably formed on the uneven surface of the molded product, which was previously difficult to do. The object of the present invention is to enable the molding of a molded product having a decorative pattern on the surface irregularities.

(Means for Solving the Problems) The present invention aims to achieve the above object and solve the above problems.Means for solving the problems are as follows: A long transfer film 4 with a desired pattern printed on the back surface is fed and guided from the outside of the mold between a fixed mold 7 and a movable mold 8 via a mold material 2, and is then opened on the fixed mold 7 side. The material is injected from the injection port 9 for material injection in a direction substantially perpendicular to the transferred and guided transfer film 4, and while pressing the transfer film 4 to the movable mold 8 side, Injection molding a unit A having an end A' and an uneven surface,
In addition, during the molding, the printed surface of the transfer film 4 is pressed against the uneven surface of the unit A by the residual heat and material pressure of the molding material, and the printed surface of the transfer film 4 is transferred onto the uneven surface by the residual heat, and then the movable mold 8 is opened. Then move the unit A outward so that the fusion surface of the rear end A' of the unit A is located directly below the injection port 9, and transfer the transfer film 4 outside the mold to both the molds 7 and 8. At the same time, the movable mold 8 is closed, and in this state, the material is injected from the injection port 9, so that the front end of the next unit B is fused with the rear end A of the unit A. Then, the next unit B is molded, and the transfer film 4 is pressed and transferred onto the uneven surface of the next unit B in the same manner as the unit A, and then the movable mold 8 is opened and closed, each unit is molded, and the transfer film 4 is transferred. After sequentially repeating pressure bonding and transfer to the surface of the single body to form a long object in which a plurality of single bodies are fused and integrated, the film layer 3 of the transfer film 4 is peeled off via the mold release material 2 to form the long piece. The purpose is to form decorative patterns on the uneven surface of objects.

(Function) In other words, since the long transfer film 4 can be crimped and transferred at the same time as each unit is molded while being fed and guided into the mold in sequence according to the molding of each unit, the crimping and transfer work is This can be carried out in the same way as molding of a molded product, and since the material is injected from a direction substantially perpendicular to the feeding direction of the transfer film 4, the material can be injected without having to attach the transfer film 4 in advance in contact with the mold surface. The film is smoothly pressed onto the movable mold 8 side by injection, so that the film can be smoothly pressed and transferred to the molded unit, and the material injection port 9 is formed in the fixed mold 7 itself. Also, the injection work is not hindered by the transfer film 4 inserted into the mold from the outside.

(Example) Hereinafter, embodiments of the present invention will be described according to an example shown in the drawings.

First, as shown in FIG. 1, a film supply roller 5 wrapped with a transfer film 4 formed by integrally forming a film layer 3 on a printed surface 1 with a desired decorative pattern via a release material 2 is placed on a molding machine main body 6. installed on one side of the

In this state, a part of the transfer film 4 is pulled out from the roller 5 and fixed to one end of the fixed mold 7.

Next, the movable mold 8 is moved to the fixed mold 7 side and both molds are closed as shown in FIG. Inject resin into the formed cavity.

When the resin is injected in this way, the uneven surface is formed by the shape of the mold as shown in FIG. At the same time, both edges of the transfer film 4, which has been stretched in advance in the mold, are pressed by the mold, so that the transfer film 4 is pressed so that it overlaps the uneven surface without shifting its position. Transfer film 4
The printed surface 1 is melted and transferred onto the uneven surface 12 of the molded article.

Next, after molding the unit A having the transfer film 4 with the printed pattern printed on the uneven surface in this way, the movable mold 8 is moved reversely to release it from the fixed mold 7, and one end of the film is molded. The fastening is released and the feed mechanism 13 is operated at the same time, and the unit A in the female mold 10 on the fixed mold 7 side is moved by the piston rod so that the welding surface of the rear end A is injected into the injection port 9. Push it forward until it is located directly below.

At the time of this feeding, the transfer film 4 integrally polymerized and adhered to the surface of the unit A is also simultaneously transferred to its supply roller 5.
As it is pulled out, it assumes the next molding position.

Incidentally, during this pushing, the pitch is guided so that the part to be melted, which is the rear end A' of the unit A, remains in the cavity. After the feed guide, the feed mechanism 13
Return the piston rod to its original position.

Next, by the same operation as above, the movable mold 8 is closed as shown in FIG. 6, and the resin is injected from the injection port 9 formed at the upper surface of the rear end A'. is the postponed simplex A
The resin injected from the injection port 9 in this state is separated from the previously molded unit A as shown in the figure.
The welding surface of the part to be melted, which is the rear end A', is melted by the residual heat and flows in the opposite direction to the rear end A', and at the same time as the next unit B is formed, its front end B' and The rear end A' of the single body A after the postponed hardening is melted by heat melting, and the two become fused and connected to each other.

On the other hand, the transfer film 4 stretched in the cavity is integrally bonded to the molding surface of the next unit B by the material pressure, and at the same time, the printing surface 1 is bonded to the molding surface of the next unit B by the material heat. It is melted and the desired printed pattern is transferred.

Next, from this state, the movable mold 8 is opened again as shown in FIG. 7, and the single body B is pushed together with the transfer film 4. Thereafter, a long molded product can be obtained by sequentially repeating the above operations. Furthermore, by peeling off the film layer 3 from the surface of the molded product that has been removed from the mold after molding, a long product 14 as shown in FIG. 8 having a desired printed pattern on the uneven surface can be molded. This is possible. Moreover, the printed pattern is clearly printed on the concavo-convex group. In this embodiment, the transfer film 4
The transfer film 4 is fed by fixing one end to the mold at first, and then automatically guided by the previously molded unit A along with the feeding of the unit A, making the feeding operation of the transfer film 4 extremely easy. In addition to being smooth, one end of the transfer film 4 is stretched alone and the other end is stretched in a substantially horizontal state by a feed roller 5 to guide the transfer, as shown in Fig. 9. In order to accurately feed and guide the film along its uneven shape, an attachment 15 whose surface has the same shape as the uneven surface of the molded product is provided on the feeding guide section on the front side of the mold, and the transfer film 4 is passed through this attachment 15. When the film 4 is fed and guided, the film 4 stretched in the cavity has approximately the same shape as the uneven surface to be molded, so there is an advantage that it can be superimposed on the uneven surface extremely easily and with high precision. Incidentally, the length of the elongated object, the uneven shape of the surface, etc. are by no means limited to the above embodiments. Furthermore, the decorative pattern on the printed surface of the transfer film is not limited.

Further, the shape of the rear end of the single piece molded in the mold is not limited to the approximately L-shaped cross section as in the embodiment, but the point is that the material is melted by injection from the injection port 9, It suffices if it is formed with a fusion surface that allows it to be fused and integrated with the next unit.

(Effects of the Invention) Since the present invention has the above characteristics, it has the following effects.

(b) First of all, it is possible to mold a long molded product by fusing and integrating each unit, and also to mold the unit while sequentially feeding and guiding the long transfer film into the mold according to the molding of each unit. Since the method involves pressing and transferring onto the single body at the same time as the molding, it is possible to perform not only the molding of long objects but also the transfer of the transfer film to the molded object in a continuous operation, and the workability is extremely high. Not only is it good, but it also has the remarkable effect of being able to mold a long object with a decorative pattern on the surface irregularities, which cannot be obtained by the conventional method as disclosed in JP-A No. 49-105856. I've reached it.

(b) Furthermore, since the molding material is injected from a direction substantially perpendicular to the transfer film that is fed and guided into the mold, the pressure of the injection material presses the transfer film onto the mold surface and forms the molded product. There is no need to take the trouble to attach a transfer film in contact with the mold surface as in the conventional method described above, and there is no problem with continuous work.

(C) Furthermore, since the transfer film is sequentially fed into the mold from the outside of the mold, for example, if the material is injected from the outside of the mold using the nozzle in the method of JP-A No. 48-83150, the above-mentioned The transfer film that guides the feed becomes an obstacle, making the work very troublesome or difficult, but in the present invention, the injection port for the material is provided in the mold itself, so the transfer film may become a hindrance to the injection work. Not at all.

(d) Furthermore, since the long object to be molded is obtained by fusing and integrating the single pieces, there is an advantage that cracks, breaks, etc. will not occur at the joints between the single pieces.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a transfer film as an example. FIG. 2 is a schematic plan view of a molding machine main body as an example. Figure 3 is a sectional view of the main parts when the mold is closed.
FIG. 4 is a cross-sectional view of the main part during single molding. FIG. 5 is a cross-sectional view of the main part when pushing a single unit. FIG. 6 is a sectional view of the main part during the next single-piece molding. FIG. 7 is a cross-sectional view of the main part when pushing a single unit.
FIG. 8 shows the long product after molding, where A is a plan view, B is a front view, and C is a sectional view. FIG. 9 shows an attachment for supplying a transfer film as another embodiment, in which A is a plan view and B is a front view in use. 1...Printing surface, 2...Release material, 3...Film layer, 4...Transfer film.

Claims (1)

[Claims] 1 A long transfer film 4 with a desired pattern printed on the back side of the film layer 3 via a mold release material 2 is fed and guided from the outside of the mold between a fixed mold 7 and a movable mold 8, and then The transfer film 4 is fed and guided through an injection port 9 for material injection provided on the mold 7 side.
While pressing the transfer film 4 onto the movable mold 8 side by injecting material in a direction substantially perpendicular to the direction, a single body A having a rear end A' as a part to be melted and having an uneven surface on the surface is formed. injection molding, and during the molding, the printed surface of the transfer film 4 is pressed onto the uneven surface of the unit A by residual heat and material pressure of the molding material, and is transferred to the uneven surface by the residual heat,
Next, the movable mold 8 is opened and the unit A is moved outward so that the fusion surface of the rear end A' of the unit A is located directly below the injection port 9, and the outside of the mold is transferred. The film 4 is fed and guided between the two molds 7 and 8, and the movable mold 8 is closed. In this state, the material is injected from the injection port 9, so that the front end of the next unit B becomes the same as that of the unit A. The next unit B is molded so as to be fused and integrated with the rear end A', and the transfer film 4 is crimped and transferred onto the uneven surface of the next unit B in the same manner as the unit A, and then the movable mold 8 is opened and closed. After sequentially repeating the molding of each unit, pressing and transferring the transfer film 4 onto the surface of the unit to form a long product in which a plurality of units are fused and integrated, the film layer 3 of the transfer film 4' is separated. A method for molding a long article having a decorative pattern on the uneven surface of the long article, characterized in that the decorative pattern is formed on the uneven surface of the long article by peeling through a mold material 2.