JPH11240034A - Molding terminal processing method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] When a molding material provided with a decorative film on the surface is subjected to terminal processing by hot press molding, it is difficult to cause a defect such as a scratch or a concave shape on the decorative film on the design surface side. SOLUTION: A decorative film 21 is laminated on a surface of a base material 11, and a terminal back surface 13 of a molding material 10 having a predetermined cross-sectional shape is partially cut off, and the terminal is introduced into a terminal forming cavity 43 of a press forming die 41. And heat-softening the mold material, closing the mold and press-molding the cut portion of the molding material into a required shape.
And press-molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding terminal processing method.

[0002]

2. Description of the Related Art In a vehicle or the like, an elongated strip-shaped plastic molding is often mounted on the vehicle or the like for the purpose of protecting the vehicle body or decorating the vehicle. In addition, since the molding has a long predetermined cross-sectional shape, a material obtained by cutting a molding material made of an extruded product into a predetermined size is often used from the viewpoint of, for example, increasing the efficiency of manufacturing operations. Furthermore, in the molding material cut to the predetermined length, in order to improve the aesthetics of the end portion, it is processed into a required shape, or when it is used as a side molding by sticking to the side of the body of an automobile. In order to avoid interference of the mall terminal when opening and closing the door, the terminal is processed into a thin shape.

Conventionally, a hot press molding method has been frequently used as a molding end processing method. In the hot press molding method, first, an extruded product having a predetermined cross-sectional shape is cut to form a molding material having a required length, and a required amount of the back surface of the molding material is cut off, and then the terminal is heated and softened. Press molding to required shape with press mold.

Recently, in order to further improve the decorativeness of the molding, as shown in FIG. 9, a molding material 50 in which a decorative film 61 is laminated on the surface of a molding base material 51 made of vinyl chloride resin (PVC) or the like is used. May be used. The decorative film 61 is made of PET (polyethylene terephthalate), polyvinyl fluoride or ETF.
E (ethylene-tetrafluoroethylene copolymer) or the like, a decorative layer 63 made of a vapor-deposited or printed aluminum or chromium is provided on the back surface of a surface layer 62 made of a transparent film such as an ethylene-tetrafluoroethylene copolymer. It is laminated on the surface of the molding base material 51 at the time of extrusion molding of the molding base material 51 via the back surface layer 65 of the same material as the material 51.

However, when end processing is performed on the molding material provided with the decorative film 61 by hot press molding, a uniform pressure is applied to the design surface side of the molding material due to a variation in the back surface cutting amount and a variation in cross-sectional shape. Depending on the shape of the molding terminal, air may be trapped between the press mold and the surface of the molding material on the design surface side depending on the shape of the molding terminal, and as shown in FIGS. Concave shape 73 on surface 72
However, there is a problem that the appearance is impaired. Further, there is a problem that traces due to small scratches or dust on the mold surface remain on the surface of the decorative film, and the traces are more conspicuous than a molding material having no decorative film.

In the molding material 50 provided with the decorative film 61, there is also a problem that the decorative film 61 on the surface is easily damaged when set in a press mold or the like, and the scratch is noticeable.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above points, and is intended to be applied to a decorative film on a design surface side when a molding material having a decorative film on its surface is subjected to terminal processing by hot press molding. A molding terminal having a good appearance is obtained by making it difficult for defects such as scratches and concave shapes to occur.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a molding method in which a decorative film is laminated on the surface of a base material and the back surface of the molding material having a predetermined sectional shape is partially cut off to form the molding terminal into a press-molded terminal. After introducing into the cavity and softening by heating,
In a molding end processing method of closing a mold and press forming a cut portion of the molding material into a required shape, a protective film is pasted on a decoration film surface of the molding material in advance and the press molding is performed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 is an enlarged sectional view showing an example of the structure of a molding material according to the present invention, FIG. 2 is a perspective view of the molding material of FIG. 1, FIG.
FIG. 5 is a cross-sectional view showing a state of being placed on a press mold, FIG. 5 is a cross-sectional view showing a state of softening by heating, FIG. 6 is a cross-sectional view showing a state of a press, FIG. It is sectional drawing of the molding obtained by molding.

As shown in FIG. 1, a molding material 10 used in the present invention has a structure in which a decorative film 21 is laminated on a surface of a molding substrate 11 on the design side, and a protective film 31 is further formed on the surface of the decorative film 21. Are formed by cutting an extruded product in which respective members are integrated by coextrusion into a predetermined length. FIG. 2 shows a mall material 10
1 is a perspective view as viewed from the back surface side, and has the same configuration as that of FIG. 1, but is represented only by the molding base material 11, the decorative film 21, and the protective film 31 in order to prevent the view from becoming difficult to see. The decorative film 21 may be provided only on a part of the molding substrate 11 on the design surface side, and the protective film 31 may be laminated before the subsequent press forming.

The molding substrate 11 is made of PVC or PP.
(Polypropylene) or the like. The decorative film 21 is for improving the decorativeness of the design surface of the molding material 11, and is formed by vapor deposition or printing of a metal such as aluminum or chromium on the back surface of the surface layer 22 made of a transparent film such as PET, polyvinyl fluoride, ETFE, or the like. Is provided on the molding substrate 11 via an adhesive 24 and a back surface layer 25 made of a material compatible with the molding substrate 11. Note that the decorative film 21, the adhesive 24, and the back layer 25 are made of known materials conventionally used for molding materials.

The protective film 31 protects the surface of the decorative film 21 of the molding material 10 and also prevents a problem on the surface of the decorative film 21 during press molding described later. Is laminated on at least the surface of the decorative film 21 via a known adhesive 32. If the protective film 31 has poor elongation,
Protective film 3 at corners etc. during subsequent press molding
1 has a problem that wrinkles and the like occur, and the wrinkles are transferred to the decorative film 21 to deteriorate the aesthetic appearance of the design surface of the molding. On the other hand, if the elongation is too good, there is a problem that bubbles trapped between the protective film 31 and the mold surface during press molding are transferred to the decorative film 21 via the protective film 31. Therefore, it is preferable that the protective film 31 has an elongation equal to or greater than that of the surface layer 22 of the decorative film. In this example, the surface layer 22 of the decorative film has an elongation of 180% (measured in accordance with JIS K 6734).
Of ETFE, the elongation is 200% (JIS
K according to K 6734), PV having a thickness of 0.08 mm
C formed the protective film 31. Further, if the thickness of the protective film 31 is too large, the shaping of the corners tends to be loose during press molding, and if the thickness is too small, the function of the protective film 31 is not fulfilled.
It is preferably 0.3 mm. Furthermore, if the protective film 31 is too hard, it will be difficult to conform to the surface shape of the molding base material 11 when laminating on the surface of the decorative film 21. Is preferably in the range of 60 to 90 degrees in Shore A hardness, and in this example, the Shore A hardness is 70 degrees.

A molding material 10 of a predetermined length having the above-mentioned structure.
The required amount of the back surface 13 of the terminal 12 is cut off as shown in FIG.
Reference numeral 14 denotes a resection portion. This excision is performed so that shaping in the subsequent press molding can be easily and reliably performed, and an appropriate amount is excised according to the terminal shape required for molding.

Next, the molding material 10 from which the terminal back surface has been cut is placed on the lower mold 42 of the press mold 41 with the back surface 13 facing upward, as shown in FIG. An end molding cavity 43 having an end shape of the molding is formed in the lower mold 42 of the press molding die.
The molding material 10 is arranged on the inner end 44 of the molding material 3 so as to ride over the end 12 of the molding material 10. that time,
Since the protective film 31 is provided on the design surface side of the molding material 10, even if the design surface of the molding material 10 may rub against a part of the lower mold 42, the decorative film 21 may be damaged. Absent. The lower mold 42 is more preferably made of a material such as a known porous material from which air bubbles can easily escape.

As shown in FIG. 5, the back surface 13 of the molding material 10 placed in the lower mold 42 of the press molding die is heated by a heating means 47 such as an electric heater, and the molding is performed in the same manner as in the known hot press molding. The terminal 12 of the material 10 is softened.

Next, as shown in FIG.
And the upper mold 44 closes the back surface 13 of the molding material 10.
Is pressed to shape the cutout portion 14 of the terminal 12 of the molding material 10 into a shape along the mold surface 45 of the cavity 43 of the lower mold 42. At this time, as shown in FIG. 7 showing a 7-7 cross section, the protective film 31 and the lower mold surface 45 of the terminal 12 of the molding material 10 are used.
Even if air bubbles 48 are trapped in between, the air bubbles 48 are absorbed by elongation, softness, etc. of the protective film 31 and the decorative film 2 inside the protective film 31.
1 has no effect or becomes smaller. As a result, the concave portions due to the bubbles 48 are less likely to be transferred to the design surface side of the decorative film 21. Even if the concave portion due to the bubble is transferred, it is very slight and hardly noticeable. Further, even if there is a flaw or dust on the mold surface 45 of the lower mold 42, the protective film 31
Can prevent the defective shape from being transferred to the design surface side of the decorative film 21. Reference numeral 15 in FIG. 6 denotes burrs that have become excessive during press molding.

After that, if the press mold 41 is opened and the molded product is taken out, the molding 17 shown in FIG. 8 is obtained, and if the burr 15 is removed, a desired product is obtained. In addition,
Thereafter, the protective film 31 is peeled off at an appropriate time. For example, if it is peeled off after being attached to a car or the like, it is useful to protect the design surface of the molding until then.

[0018]

As shown and described above, according to the molding end processing method of the present invention, the protective film is laminated on the decorative film surface on the design side of the molding material, so that the molding material is not press-molded. Transfer on the decoration film surface due to the bubbles trapped in the surface can be prevented, and a molding terminal having a good design surface can be obtained. Furthermore, it is also possible to prevent traces such as scratches and dust existing on the mold surface of the press mold from remaining on the decorative film. In addition, it is possible to prevent the decorative film on the design surface of the molding material from being damaged at the time of disposition in the press mold, and the like.
Furthermore, if the protective film is peeled off at an appropriate point after the terminal processing, it is possible to prevent the design surface of the molding from being damaged until that point.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a configuration of an example of a molding material according to the present invention.

FIG. 2 is a perspective view of the molding material of FIG. 1;

FIG. 3 is a perspective view showing the molding material after the back surface is cut off.

FIG. 4 is a cross-sectional view showing an arrangement state in a press mold.

FIG. 5 is a cross-sectional view showing when softening by heating.

FIG. 6 is a cross-sectional view showing a state during pressing.

FIG. 7 is a sectional view taken along the line 7-7 in FIG. 6;

FIG. 8 is a sectional view of a molding obtained by removing the mold.

FIG. 9 is an enlarged sectional view showing a configuration of a conventional molding material.

FIG. 10 is a perspective view of a molding showing a problem with the prior art.

FIG. 11 is a sectional view of FIG. 10;

[Explanation of symbols]

 Reference Signs List 10 molding material 11 molding base 12 terminal 13 back surface 21 decorative film 22 surface layer 31 protective film 41 press mold 42 lower mold 43 terminal molding cavity 45 lower mold surface

Claims (4)

[Claims] 1. A terminal having a decorative film laminated on a surface of a base material and having a predetermined cross-sectional shape is partially cut off from the back surface of the terminal, and the terminal is introduced into a terminal molding cavity of a press mold and softened by heating. Thereafter, in a molding terminal processing method of closing the mold and press-molding the cutout portion of the molding material into a required shape, the method is characterized in that a protective film is pasted in advance on a decorative film surface of the molding material and the press molding is performed. Molding terminal processing method. 2. The method according to claim 1, wherein the extension of the protective film is equal to or greater than the extension of the surface layer of the decorative film. 3. The method according to claim 1, wherein the hardness of the protective film is 60 to 90 degrees in Shore A hardness. 4. The method according to claim 1, wherein
A molding end processing method, wherein the thickness of the protective film is 0.05 to 0.3 mm.