JP3056389B2 - Synthetic resin molding and method of manufacturing the same - Google Patents

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 producing the same, and more particularly, to a synthetic resin molding having a decorative film having a fixed width adhered to a surface thereof and a method for producing the same.

[0002]

2. Description of the Related Art As shown in FIGS. 5 and 6, for example, a window glass G of an automobile is attached to a vehicle body P by fitting a synthetic resin molding M to an outer peripheral edge thereof. This synthetic resin molding M is composed of a flexible long molding 10A made of a plastic extruded product such as a vinyl chloride resin. As shown in FIG. A decorative film 50 of 1 to 0.3 mm is adhered, and a strip 15 for preventing expansion and contraction such as aluminum foil or a metal wire is embedded in the inside of the molding. Then, as shown in FIG. 5, the long molding body 10A is bent with a predetermined reference radius (bending radius) corresponding to the outer peripheral shape of the window glass G on the basis of the strip 15 for preventing expansion and contraction (B1, B).
2, B3, B4), mounted on the edge of glass G. Sign J
Is a joint portion of the terminal of the mall body 10A. In FIG. 6, reference numeral 12 denotes a glass fastening piece of a molding body, 13 denotes an upper fin, 14 denotes a lower fin, A denotes an adhesive, and P denotes a vehicle body panel.

[0003] As the decorative film 50 to be adhered to the surface of the long molding body 10A, a film composed of a base film layer and a surface film layer formed with a metal deposition layer is usually used. For example, the decorative film 50A illustrated in FIG.
A surface film layer 52A obtained by laminating a polyester or fluororesin film 63 via an adhesive 65 on an upper surface of a polyester film 61 on which a metal deposition layer 62 is formed is attached to a base film layer 51A made of a vinyl chloride resin with an adhesive 64. It is what I wore. The decorative film 50B shown in FIG. 8 has a base film layer 51B made of a vinyl chloride resin and a surface film layer 52B made of a polyester or fluororesin film 66 on which a metal vapor-deposited layer 67 is formed adhered by an adhesive 68. Things. In addition, these decorative films 50A, 50B
Is integrally adhered or embedded on the surface side of the molding body 10 via the base film layers 51A and 51B during the extrusion molding of the molding body 10.

Incidentally, the extruded synthetic resin molding 10A is characterized in that the dimensional change is relatively large due to molding shrinkage, post-shrinkage after molding (releasing strain) and linear expansion. In particular, when the temperature is high such as in summer, after-mold shrinkage is likely to occur, so that the entire mould shrinks. Further, in the window molding M as shown in FIG. 5, the inside I of the bent portions B1, B2, B3, and B4 bent in the shape of the window glass G is in the contracting direction of the molding, and the outside O is the extending direction of the molding. , Respectively, and during post-shrinkage, the inside I of the bent portion tends to shrink more due to this stress.

However, the decorative film 50 adhered to the surface side of the molding body 10A has a poor followability as compared with the molding body which is a plastic molded product. In the case where the stress in the shrinkage direction is applied, the shrinkage of the molding body is large because the shrinkage amount of the decorative film is smaller than the shrinkage amount of the molding body as a result. There is a problem that S appears. Also, when the width of the decorative film is wide, the difference between the inner and outer perimeters of the bent portion becomes large, so that wrinkles are more likely to occur.

As shown in FIG. 9, for example, such wrinkles are generated by peeling between the base film layer 51 and the surface film layer 52 of the decorative film 50, and as shown in FIG. May be caused by the entire decorative film 50. The former wrinkles S due to peeling between the film layers 51 and 52 can be solved by increasing the adhesive strength of each layer, but as a result, the latter wrinkles S of the entire decorative film are caused. In such a case, Had no solution.

Therefore, in order to prevent such wrinkles 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 10A and the decorative film 50, or to reduce the width of the decorative film 50. Then, there is no other choice but to make the circumferential length difference between the inner circumferential side and outer circumferential side as small as possible.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been proposed to effectively solve such a problem, and is a decorative film stuck or buried on the surface side of a bent portion of a molding body. An object of the present invention is to provide a synthetic resin molding having good appearance, in which wrinkles do not 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 extruded product, and a decorative film having a fixed width is adhered or embedded on a surface side thereof.
And inside is a long molding body in which a stretch prevention strip is embedded integrally, and the long molding body has a predetermined reference radius in the width direction of the decorative film with respect to the stretch prevention strip. In a device having at least one bent portion to be bent, a film shrinkage ratio of an inner edge portion of the decorative film in a bent portion with a minimum reference radius among the bent portions is calculated, and according to the shrinkage ratio, The decorative film is attached or embedded on the surface side of the extruded product in a state where the entire decorative film is stretched in advance.

[0010] The method of manufacturing a synthetic resin molding of the present invention comprises a plastic extruded product, a decorative film having a fixed width is stuck or buried on the surface side, and a strip for preventing expansion and contraction is integrally formed inside. A long molding body embedded in the decorative molding film, the long molding body has at least one bent portion that can be bent at a predetermined reference radius in the width direction of the decorative film based on the stretch-preventing strip. In the manufacturing method of the thing, the film shrinkage ratio of the inner edge portion of the decorative film in the bent portion with the minimum reference radius of the bent portion was calculated, and the entire decorative film was stretched in advance in accordance with the shrinkage ratio. The method is characterized in that a long molding is manufactured by sticking or embedding the surface of the extruded product in the state.

[0011]

The synthetic resin molding and the method of 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 with the minimum reference radius among the bent portions of the molding body, and calculate the shrinkage ratio. Since the long molding body is manufactured in a state where the entire decoration film is stretched in advance in accordance with the above, the shrinkage of the molding body that occurs late in the bent portion is in the direction of restoring the stretched decoration film. It works and avoids stress on the film portion, thereby preventing wrinkles from occurring. The stretched state is further stretched in the outer side of the decorative film at the bent portion. However, in the case of this kind of decorative film, the elongation of 20% or less does not cause any appearance problem.

[0012]

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

The present invention relates to a synthetic resin molding and a method for producing the same. In particular, the decorative film 11 is made of a plastic extruded product as described above and shown in FIG. Affixed or buried,
A long molding body 10 in which a strip 15 for preventing expansion and contraction is integrally buried therein, and the long molding body 10 is predetermined in the width direction of the decorative film 11 based on the strip 15 for preventing expansion and contraction. The present invention relates to a synthetic resin molding having at least one bent portion 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 a window molding M for an automobile as described in FIG. 5 and has bent portions B1, B2, B3 and B4 which are bent to the outer peripheral shape of the window glass G. It has a long mall 10 having The same reference numerals as those in FIG. 5 indicate the same parts. And in this invention, these bending parts B1, B
2, the decorative film 1 in a bent portion (here, a bent portion B3) with a minimum reference radius of B4.
Calculating the film shrinkage rate of the inner edge portion 11I of 1
According to this shrinkage ratio, the decorative film 11 is pasted or embedded on the surface side of the extruded product in a state where the decorative film 11 is stretched in advance.

That is, taking FIG. 4 as an example, FIG. 4 is a plan view of a bent portion B of the molding body 10 shown in FIG. Decorative film 11 based on strip 15
Are bent at a predetermined angle d with a predetermined reference radius R in the width direction of the. The bending radius of a portion indicated by a broken line ST in the drawing, which is a portion corresponding to an upper portion of the expansion-prevention strip 15 of the decorative film 11 having a fixed width attached or embedded on the surface side of the molding body 10 is: The expansion and contraction is substantially zero in the decorative film portion which is the same as the reference radius R of the strip 15 for preventing expansion and contraction and is located on the broken line ST. On the other hand, the bending radius RI at the inner edge 11I of the decorative film located inside the bent portion from the broken line ST is smaller than the reference radius R, and the contraction C occurs. Also, broken line ST
Outer edge 1 of the decorative film positioned outside the bent portion
The bending radius RO at 1O becomes larger than the reference radius R, and an elongation N occurs.

Then, when the shrinkage ratio at the inner edge 11I of the decorative film is calculated, the shrinkage ratio (X) is equal to the peripheral length (LS) of the reference radius R at the bent portion B as well as the inner edge of the decorative film at the bent portion B. 11I bending radius R
It can be obtained by dividing the difference between I and the circumference (LI) by the circumference (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 rate (Y) at the outer edge 110 of the decorative film is the same as the circumference (LS) of the reference radius R at the bent portion B, as in the bending of the outer edge 110 of the decorative film at the bent portion B. Perimeter of radius RO (L
O) can be obtained by dividing the difference from O) by the circumference (LS) of the reference radius R in the bent portion B. Elongation (Y) = (perimeter of bending radius RO (LO) −perimeter of reference radius R (LS)) / perimeter of reference radius R (LS)

Here, a specific example according to the embodiment will be described.
A bent portion B obtained by bending the molding body 10 to which the decorative film 11 having a width of 8.2 mm is stuck at a reference radius R of 70 mm by 90 degrees.
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 110 of the decorative film is 71.8 mm. The perimeter (LS) of the reference radius R in the bent portion B is 110 mm, and the perimeter (LI) of the bend radius RI of the inner edge 11I of the decorative film is 99.
The peripheral length (LO) of the bending radius RO of the decorative film outer edge 110 is 92.8 mm, the shrinkage ratio (X) in this embodiment is 0.092, and the elongation ratio (Y) is 0.025.
It is.

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

The expression "according to the shrinkage ratio (X)" means that the shrinkage ratio (X) is used as a reference, and the shrinkage ratio may be directly used as the stretching ratio (stretched portion). It may be adjusted in consideration of the use situation and the like. In addition, since the decorative film 11 is stuck on the molding body 10 and follows the expansion and contraction of the molding body 10 to some extent,
Considering this follow-up, 80% of the calculated shrinkage
It is practical to set the above as the stretching amount. Speaking from the above specific example, if the calculated shrinkage ratio (X) is 0.092, that is, 9.2%, the stretch amount of about 7 to 8%, which is at least 80%, and 107 to 107% as a whole. 10
What is necessary is just to manufacture a molding body with the decorative film 11 stretched at 8%.

As described above, the decorative film in the stretched state is further stretched at the outer portion of the decorative film at the bent portion B. However, the decorative film used for this kind of molding has a stretch of 20%. The following elongation does not cause any problem in appearance.

Next, a specific example of manufacturing the molding body 10 with the decorative film 11 stretched will be described. FIG.
1 schematically shows an example of an apparatus for carrying out the method of the present invention. In the figure, reference numeral 20 denotes an extruder, 21 denotes a die, 22 denotes a cooling water tank, 23 denotes a take-off machine, and 24 denotes a cutter. is there. As described above, the decorative film 11 has a total thickness of 0.1 to 0.3 mm including the base film and the surface film on which the metal deposition layer is provided. It is stretched in its longitudinal direction according to the rate.

That is, the decorative film 11 is formed by winding a long product in a roll shape as shown in the figure. One end of the decorative film 11 is connected to a die 21 via a stretching mechanism 25.
Is inserted into. As the stretching mechanism 25 for the decorative film 11, a method using a brake member such as felt, a method for stretching the decorative film 11 with a difference between the feeding speed of the decorative film and the speed of taking the molding body 10 by the take-up machine 23, an appropriate number of tension rollers, A known method such as a method in which a decorative film is inserted into the roller and stretched by a predetermined amount in combination is appropriately selected. The decorative film 11 may be stretched immediately before the die 21 as shown in the drawing, or may be stretched in advance in the state of a raw fabric.

The decorative film 11 stretched at a predetermined ratio in this manner is fed into the die 21 and
At the same time and integrally with the molding of No. 0, it is adhered or embedded, or supplied near the exit of the die 21 to be integrally adhered to the surface of the molding body 10 immediately after molding. Decorative film 11
The molding body 10 on which is integrally adhered is taken by a take-off machine 23, passed through a cooling water tank 22, cooled, and cut into a predetermined length by a cutter 24. These techniques are similar to known methods.

As shown in FIG. 2, the decorative film 11 can be stretched in the die 31 by a resin pressure. As shown in the drawing, the die 31 has resin flow paths 32 and 33 through which the resin P constituting the molding body 10 is extruded;
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 through the passage 34 is integrated with the resin P in the die 31 to form the molding body 1.
0 is formed. 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 or by a brake roller 35 immediately before the die 31 and a take-off roller 36 immediately after.

The molding body 10 integrally having the stretched decorative film 11 manufactured by the above-described method is manufactured by a known bending machine or a human hand in a process after the manufacturing according to the shape of the mounting portion. A bent portion is formed with the reference radius. The molding body 10 may be bent in the width direction of the decorative film 11 or in the surface direction of the decorative film 11 in some cases.

When the molding is formed, the one in which the decorative film is embedded on the surface side, that is, the one in which the protective resin layer is coated on the decorative film, is used for protecting the protective film before attaching to the window glass or the like. The resin layer may be peeled off and used.

[0028]

As shown and described above, according to the molding body and the method of manufacturing the same according to the present invention, the inner edge portion of the decorative film at the bent portion having the minimum reference radius among the bent portions of the molded body is provided. Since the film shrinkage rate is calculated, and the decorative film is stretched in advance in accordance with the shrinkage rate, the decorative film is pasted or embedded on the surface side of the extruded product. Even if the film shrinks, it acts in the direction of restoring the decorative film in the stretched state, thereby avoiding stress on the film portion and preventing wrinkles from occurring. Therefore, the decorative film is not wrinkled, and the appearance is extremely well maintained. Further, unlike the related art, the limitation on the shape of the bent portion and the width of the decorative film is reduced, so that the degree of freedom in design is increased.

[Brief description of the drawings]

FIG. 1 is a schematic process chart of extrusion molding of a molding body showing an example of a production 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 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.

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

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

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

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

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

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 molding body 11 decorative film 15 stretch prevention strip 20 extruder 21 die 25 stretching mechanism B bent portion R reference radius RI bending radius of decoration film inner edge L reference radius LI peripheral length LI decorative film inner edge

──────────────────────────────────────────────────続 き Continued from the front page (56) References JP-A-2-169228 (JP, A) JP-A-60-53446 (JP, A) JP-A-1-127432 (JP, A) JP-A-4- 39030 (JP, A) JP-A-5-85162 (JP, A) JP-A-5-96596 (JP, A) JP-A 5-185502 (JP, A) International publication 95/6553 (WO, A1) ( 58) Fields surveyed (Int. Cl. ⁷ , DB name) B29C 47/00-47/96

Claims (4)

(57) [Claims] 1. A long molding body made of a plastic extruded product, having a decorative film of a fixed width stuck or buried on the surface side and a strip for preventing expansion and contraction integrally buried inside. 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 respect to the strip for preventing expansion and contraction. Calculate the film shrinkage rate of the inner edge portion of the decorative film in the bent portion by the reference radius, and adhere to the surface side of the extruded product in a state where the entire decorative film is stretched in advance according to the shrinkage rate. A synthetic resin molding that is buried. 2. The synthetic resin molding according to claim 1, wherein at least 80% of the film shrinkage at the inner edge portion of the decorative film is a stretched amount. 3. A long molding body made of a plastic extruded product, having a decorative film of a fixed width adhered or buried on the surface side and a strip for preventing expansion and contraction integrally buried inside. A method of manufacturing the long molding body having at least one bent portion that is bent at a predetermined reference radius in a width direction of the decorative film with respect to the stretch-preventing strip, The film shrinkage ratio of the inner edge portion of the decorative film in the bent portion with the minimum reference radius is calculated, and the entire decorative film is stretched in advance in accordance with the shrinkage ratio and attached to the surface side of the extruded product. A method for manufacturing a synthetic resin molding, wherein the molding is performed by attaching or burying the molding. 4. The method for producing a synthetic resin molding according to claim 3, wherein at least 80% of the film shrinkage at the inner edge portion of the decorative film is stretched.