JPH08183080A - Synthetic resin molding and production thereof - Google Patents

Abstract

PURPOSE: To obtain a good-appearance synthetic resin molding and a production method thereof in which a decorative film bonded to the surface is not or hardly wrinkled at the bent part of the molding. CONSTITUTION: A film shrinkage factor of an inner edge part of a decorative film 11 at a bent part having a minimum reference radius is calculated. The decorative film 11 is previously drawn in accordance with the shrinkage factor to be bonded to the surface of an extruded piece or embedded therein.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin molding and a method for manufacturing the same, and more particularly to a synthetic resin molding having a surface with a decorative film of a certain width attached thereto and a method for manufacturing the same.

[0002]

2. Description of the Related Art As shown in FIGS. 5 and 6, the window glass G of an automobile is attached to a vehicle body P by fitting a synthetic resin molding M on the outer peripheral edge thereof. This synthetic resin molding M is composed of a flexible elongated molding 10A made of a plastic extrusion molded product such as vinyl chloride resin, and the molding surface which is a visible portion has a uniform thickness of 0.1 mm. A decorative film 50 having a thickness of 1 to 0.3 mm is attached, and a stretch-preventing strip 15 such as an aluminum foil or a metal wire is integrally embedded inside the molding. Then, as shown in FIG. 5, the long molding body 10A is bent at a predetermined reference radius (bending radius) corresponding to the outer peripheral shape of the window glass G with reference to the stretch-preventing strip 15 (B1, B).
2, B3, B4), and is attached to the edge of the glass G. Code J
Is a joining portion of terminals of the mall body 10A. In FIG. 6, reference numeral 12 is a glass-molding piece of a molding, 13 is an upper fin piece, 14 is a lower fin piece, A is an adhesive, and P is a vehicle body panel.

As the decorative film 50 attached to the surface of the long molding 10A, one having a base film layer and a surface film layer on which a metal vapor deposition layer is formed is usually used. For example, the decorative film 50A shown in FIG.
A surface film layer 52A in which a polyester or fluororesin film 63 is further laminated on an upper surface of a polyester film 61 formed with a metal vapor deposition layer 62 with a base film layer 51A made of vinyl chloride resin via an adhesive agent 65 is attached by an adhesive agent 64. I wore it. In the decorative film 50B shown in FIG. 8, a surface film layer 52B made of polyester or fluororesin film 66 having a metal vapor deposition layer 67 formed thereon is attached to a base film layer 51B made of vinyl chloride resin with an adhesive 68. It is a thing. In addition, these decorative films 50A and 50B
Is integrally attached or embedded on the surface side of the molding body 10 during extrusion molding via the base film layers 51A and 51B.

By the way, the synthetic resin molding 10A extruded is characterized in that the amount of dimensional change is relatively large due to molding shrinkage, post-shrinkage (release of strain) and linear expansion after molding. In particular, at high temperatures such as in summer, post-shrinkage of the molding tends to occur, and the entire molding shrinks. Further, in the wind molding M as shown in FIG. 5, the inside of the bent portions B1, B2, B3, B4 bent into the shape of the wind glass G is in the shrinking direction of the molding, and the outside O is in the stretching direction of the molding. In the post-shrinkage, there is a tendency that the stress is exerted on the inner side I of the bent portion, and this stress causes a larger shrinkage.

However, the decorative film 50 adhered to the surface side of the molding body 10A has poor followability as compared with the molding body which is a plastic molded product, and in particular, as described above, the inside I of the bent portion is I. When the shrinkage of the decorative film is smaller than the shrinkage of the molding as a result of the fact that the shrinkage of the molding is large due to the stress in the shrinking direction, the wrinkle is applied to the film surface, which is the design surface of the molding. There is a problem that S appears. In addition, when the width of the decorative film is wide, the difference in circumferential length between the inside and the outside of the bent portion becomes large, and wrinkles are more likely to occur.

Examples of such wrinkles are caused by peeling between the base film layer 51 and the surface film layer 52 of the decorative film 50 as shown in FIG. 9, and as shown in FIG. In some cases, it is caused by the entire decorative film 50. Generation of wrinkles S due to peeling between the respective film layers 51 and 52 of the former can be solved by increasing the adhesive strength of each layer, but as a result, wrinkles S of the entire decorative film of the latter will be caused. In such a case, Had no solution.

Therefore, in order to prevent such a wrinkle S in the bent portion, the radius of the bent portion is made as large as possible to reduce the stress applied to the molding body 10A and the decorative film 50, or the width of the decorative film 50 is narrowed. Then, there was no choice but to reduce the difference in circumferential length between the inner peripheral side and the outer peripheral side as much as possible.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed in order to effectively solve such a problem, and is a decorative film adhered or embedded on the surface side of a bending portion of a molding body. An object of the present invention is to provide a synthetic resin molding having a good appearance in which wrinkles do not occur or hardly occur, and a method for producing the same.

[0009]

That is, the synthetic resin molding of the present invention is made of a plastic extrusion molded article, and a decorative film having a constant width is attached or embedded on the surface side of the molded article.
And a long molding body in which expansion and contraction prevention strips are integrally embedded, wherein the long molding body has a predetermined reference radius in the width direction of the decorative film on the basis of the expansion and contraction prevention strips. In the case of having at least one bent portion that can be bent, the film shrinkage rate of the inner edge portion of the decorative film in the bent portion having the smallest reference radius among the bent portions is calculated, and the shrinkage rate is calculated according to the shrinkage rate It is characterized in that the decorative film is adhered or embedded on the surface side of the extruded product in advance in a stretched state.

The method for producing a synthetic resin molding of the present invention comprises a plastic extruded product, a decorative film of a certain width is attached or embedded on the surface side, and a stretch-preventing strip is integrated inside. A long molding body embedded in, wherein the long molding body has at least one bent portion that is bent at a predetermined reference radius in the width direction of the decorative film with the stretch-preventing strip as a reference. In the manufacturing method of the thing, calculate the film shrinkage ratio of the inner edge portion of the decorative film in the bent portion by the minimum reference radius of the bent portion, the state in which the decorative film is stretched in advance according to this shrinkage ratio. Is attached or embedded on the surface side of the extrusion molded article to produce a long molding.

[0011]

The synthetic resin molding and the method for manufacturing the same according to the present invention calculate the film shrinkage ratio of the inner edge portion of the decorative film in the bent portion of the molding body with the minimum reference radius, and calculate the shrinkage ratio. According to the above, since the long molding body is produced in a state in which the decorative film is stretched in advance, the shrinkage of the molding body generated later in the bent portion works in a direction to restore the stretched decorative film. Therefore, the stress of the film portion is avoided and the generation of wrinkles is prevented. The stretched state is further stretched at the outer portion of the decorative film at the bent portion, but in the case of this type of decorative film, an elongation of 20% or less causes no problem in appearance.

[0012]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic process drawing of extrusion molding of a molding body showing an example of the manufacturing method of the present invention, FIG. 2 is a schematic process drawing showing another embodiment, FIG. 3 is a sectional view showing an example of the molding body, and FIG. It is a partial top view in the bending part of a molding.

The present invention relates to a synthetic resin molding and a method for producing the same, and in particular, it is made of a plastic extrusion molded article as described above and shown in FIG. Affixed or buried,
Further, there is provided a long molding body 10 in which a stretch preventing strip 15 is integrally embedded, and the long molding body 10 is predetermined in the width direction of the decorative film 11 with the stretch preventing strip 15 as a reference. The present invention relates to a synthetic resin molding having at least one bent portion that can be bent at a reference radius and a method for manufacturing the same.

The synthetic resin molding of the embodiment shown in FIG. 3 relates to the wind molding M for an automobile as described in FIG. 5, and has bent portions B1, B2, B3, B4 which can be bent to the outer peripheral shape of the wind glass G. It is composed of the long molding 10. The same reference numerals as those in FIG. 5 represent the same parts. And in this invention, these bending parts B1, B
The decorative film 1 in the bent portion (here, bent portion B3) having the smallest reference radius of 2, B3 and B4.
Calculate the film shrinkage rate of the inner edge portion 11I of 1
According to the shrinkage ratio, the decorative film 11 is stretched in advance and attached or embedded on the front surface side of the extruded product.

That is, referring to FIG. 4 as an example, this figure is a plan view of the bending portion B of the molding body 10 shown in FIG. 3 with the minimum reference radius, and is for expansion and contraction prevention embedded in the molding body 10. Decorative film 11 based on strips 15
Is bent at a predetermined angle d with a predetermined reference radius R in the width direction. Then, the bending radius of the portion indicated by the broken line ST in the figure, which is a portion corresponding to the upper portion of the stretch-preventing strip 15 of the decorative film 11 having a constant width attached or embedded on the surface side of the molding body 10, This is the same as the reference radius R of the stretch prevention strip 15, and the stretch is theoretically almost zero in the decorative film portion located on the broken line ST. On the other hand, the bending radius RI of the inner edge 11I of the decorative film located inside the bent portion with respect to the broken line ST is smaller than the reference radius R, and the shrinkage C occurs. Also, the broken line ST
Edge 1 of the decorative film located outside the bent portion
The bending radius RO in 10 becomes larger than the reference radius R, and elongation N occurs.

Therefore, when the shrinkage rate at the inner edge 11I of the decorative film is calculated, this shrinkage rate (X) is the same as the circumferential length (LS) of the reference radius R at the bent portion B, and the inner edge of the decorative film at the bent portion B is the same. Bending radius R of 11I
It can be obtained by dividing the difference from the peripheral length (LI) of I by the peripheral length (LS) of the reference radius R in the bent portion B. Shrinkage ratio (X) = (perimeter of reference radius R (LS) -perimeter of bending radius RI (LI)) / perimeter of reference radius R (LS)

For reference, the elongation (Y) at the outer edge 11O of the decorative film is the same as the circumferential length (LS) of the reference radius R at the bent portion B, and the bending of the outer edge 11O of the decorative film at the bent portion B is the same. Perimeter of radius RO (L
It can be obtained by dividing the difference with O) by the circumference (LS) of the reference radius R in the bent portion B. Elongation rate (Y) = (perimeter of bending radius RO (LO) -perimeter of reference radius R (LS)) / perimeter of reference radius R (LS)

Here, to give a concrete example according to the embodiment,
Bent portion B obtained by bending the molding body 10 to which the decorative film 11 having a width of 8.2 mm is adhered at a reference radius R of 70 mm by 90 degrees.
At the bending radius RI of the inner edge 11I of the decorative film
Is 63.6 mm, and the bending radius RO of the outer edge 11O of the decorative film is 71.8 mm. The circumference (LS) of the reference radius R in the bent portion B is 110 mm, and the circumference (LI) of the bending radius RI of the inner edge 11I of the decorative film is 99.
9 mm, the perimeter (LO) of the bending radius RO of the outer edge 11O of the decorative film is 112.8 mm, and the shrinkage ratio (X) is 0.092 and the elongation ratio (Y) is 0.025 in this example.
Is.

In the present invention, as described above, the shrinkage ratio (X) of the inner edge portion of the decorative film 11 in the bent portion with the smallest reference radius among the bent portions is calculated, and this shrinkage ratio (X ) According to
The molding body 10 is manufactured in a state in which the whole is stretched in advance. Since the entire decorative film 11 is stretched, all shrinkages of the bent portion with a reference radius other than the minimum reference radius in the case where there are a plurality of bent portions are included and absorbed in this.

Further, according to the shrinkage rate (X) means that the shrinkage rate (X) is a reference, and the shrinkage rate may be used as it is as a stretch rate (stretched portion), or the material of the molding body. It may be adjusted depending on the usage situation. Since the decorative film 11 is attached to the molding body 10 and follows the expansion and contraction of the molding body 10 to some extent,
Considering this tracking amount, 80% of the calculated shrinkage rate
It is practical to use the above as the stretched portion. Speaking from the above specific example, if the calculated shrinkage ratio (X) is 0.092, that is, 9.2%, at least 80% of the stretched amount of about 7 to 8%, and 107 or more as a whole. 10
It is sufficient to manufacture the molding body with the decorative film 11 stretched at 8%.

As mentioned above, the decorative film in the stretched state is further stretched in the outer portion of the decorative film in the bent portion B, but the decorative film used for this kind of molding body has a 20% content. The elongation below does not cause any problems in appearance.

Next, a specific example of manufacturing the molding body 10 with the decorative film 11 stretched will be described. FIG.
Is a schematic diagram showing an example of an apparatus for carrying out the method of the present invention. In the figure, reference numeral 20 is an extruder, 21 is a die, 22 is a cooling water tank, 23 is a take-up machine, and 24 is a cutter. is there. As described above, the decorative film 11 has a total thickness of 0.1 to 0.3 mm consisting of the base film and the surface film provided with the metal vapor deposition layer, and the film shrinkage calculated in advance by the stretching mechanism 25. It is stretched in its longitudinal direction depending on the rate.

That is, as the decorative film 11, a long product is wound in a roll shape as shown in the figure. One end of the decorative film 11 is attached to the die 21 via the stretching mechanism 25.
Is inserted into. As the stretching mechanism 25 for the decorative film 11, a brake member such as felt is used, a method for stretching the decorative film 11 with a difference in the delivery speed of the decorative film and the take-up speed of the molding body 10 by the take-up machine 23, and an appropriate number of tension rollers. In combination, a known method such as a method of inserting a decorative film into the roller and stretching it by a predetermined amount is appropriately selected. The decorative film 11 may be stretched just before the die 21 as shown in the drawing, or may be stretched in the original state in advance.

The decorative film 11 thus stretched at a predetermined ratio is fed into the die 21 and is then molded into the molding 1.
It is adhered or embedded at the same time as the molding of No. 0, or is integrally adhered to the surface of the molding body 10 immediately after molding by being supplied near the exit of the die 21. Decorative film 11
The molding body 10 to which is integrally attached is taken by a take-up machine 23, passed through a cooling water tank 22 to be cooled, and cut by a cutter 24 to a predetermined length. These methods are similar to known methods.

Further, the decorative film 11 can be stretched by resin pressure in the die 31, as shown in FIG. As shown in the figure, the die 31 includes resin flow paths 32 and 33 through which the resin P forming the molding body 10 is extruded,
And a passage 34 through which the decorative film 11 is inserted,
These are integrated near the exit 37 of the die 31.
The decorative film 11 inserted into the die 31 via the passage 34 is integrated with the resin P in the die 31 to form the molding body 1.
Form 0. At that time, the decorative film 11 is stretched by the resin pressure of the molten resin in the die 31. In addition,
The stretch ratio of the decorative film 11 can be adjusted by appropriately changing the resin pressure, and can also be appropriately adjusted by the brake roller 35 immediately before the die 31 and the take-up roller 36 immediately after.

The molding body 10 having the stretched decorative film 11 integrally formed therein is attached by a well-known bending machine or a human hand with a bent portion having a predetermined reference radius according to the shape of the attachment portion. . In addition, the molding body 10 can be bent in the width direction of the decorative film 11,
It may also be bent in the surface direction of the decorative film 11.

When molding a molding, a decorative film embedded on the surface side, that is, a decorative film coated with a protective resin layer, is used for protection before being attached to a window glass or the like. The resin layer may be peeled off before use.

[0028]

As shown and described above, according to the molding body and the method for manufacturing the molding body of the present invention, the inner edge portion of the decorative film in the bending portion of the bending portion of the molding body having the smallest reference radius is bent. The shrinkage rate of the film is calculated, and the decorative film is attached or embedded on the surface side of the extruded product in a stretched state in advance in accordance with the shrinkage rate. Even if shrinkage occurs, it works in the direction of restoring the stretched decorative film, avoiding stress on the film portion and preventing wrinkles. Therefore, wrinkles do not occur in the decorative film, and the appearance is extremely well maintained. Further, as in the conventional case, the restrictions on the shape of the bent portion and the width of the decorative film are reduced, so that the degree of freedom in design is increased.

[Brief description of drawings]

FIG. 1 is a schematic process drawing of extrusion molding of a molding body showing an example of the manufacturing method of the present invention.

FIG. 2 is a schematic process diagram showing another example.

FIG. 3 is a cross-sectional view showing an example of a molding body.

FIG. 4 is a partial plan view of a bent portion of the molding body.

FIG. 5 is a plan view showing a state in which a synthetic resin molding is attached to an automobile window glass.

6 is a cross-sectional view showing a mounting state of FIG.

FIG. 7 is an enlarged cross-sectional view showing an example of a decorative film.

FIG. 8 is an enlarged cross-sectional view showing another example of the decorative film.

FIG. 9 is an enlarged cross-sectional view showing an example of a wrinkled state in a bent portion of the molding body.

FIG. 10 is an enlarged cross-sectional view showing another example of a wrinkled state in the bent portion of the molding body.

[Explanation of symbols]

 10 Malle body 11 Decorative film 15 Stretch prevention strip 20 Extruder 21 Die 25 Stretching mechanism B Bending part R Reference radius RI Bending radius of inner edge of decorative film L Perimeter of reference radius LI Perimeter of inner edge of decorative film

Claims (4)

[Claims] 1. A long molding body made of a plastic extruded product, having a decorative film of a certain width adhered or embedded on the surface side, and a stretch-preventing strip integrally embedded therein. The long molding has at least one bent portion that is bent at a predetermined reference radius in the width direction of the decorative film with reference to the stretch-preventing strip, and the smallest of the bent portions. Calculating the film shrinkage rate of the inner edge portion of the decorative film in the bent portion by the reference radius, and sticking or embedding on the surface side of the extruded product in a state where the decorative film is stretched in advance according to the shrinkage rate. A synthetic resin molding characterized in that 2. The synthetic resin molding according to claim 1, wherein the stretched portion is 80% or more of the film shrinkage ratio of the inner edge portion of the decorative film. 3. A long molding body made of a plastic extruded product, having a decorative film of a certain width adhered or embedded on the surface side, and a stretch-preventing strip integrally embedded therein. In the manufacturing method of the long molding body having at least one bent portion that is bent at a predetermined reference radius in the width direction of the decorative film with the stretch prevention strip as a reference, Calculate the film shrinkage ratio of the inner edge portion of the decorative film in the bent portion by the minimum reference radius, and adhere to the surface side of the extrusion molded product in a state in which the decorative film is stretched in advance according to the shrinkage ratio. Alternatively, it is embedded and a long molding body is manufactured, and a method for manufacturing a synthetic resin molding. 4. The method for manufacturing a synthetic resin molding according to claim 3, wherein the stretched portion is 80% or more of the film shrinkage ratio of the inner edge portion of the decorative film.