JPS62255119A - Molding of decorative molded form - Google Patents

Abstract

PURPOSE:To prevent the generation of defectives due to the stagnation of air as well as the generation of the shear drop of a figure on a coating layer by a method wherein the main body of a molded form is molded under a condition that a decorative sheet, provided with a predetermined shape by a mold for molding the main body of the molded form, is arranged on a mold. CONSTITUTION:A sheet 4 is heated and softened, thereafter, is set into a wooden mold 24 equipped with deaeration holes to mold it by vacuum molding and provide it with a predetermined shape. The sheet 40, provided with the shape preliminarily, is put between metallic molds 18 to reheat and soften it again, thereafter, the sheet 40 is molded by vacuum molding utilizing a split mold 20. A parison 17 is extruded under a condition that a decorative sheet 14, transferred with a predetermined recessed and projected figure and provided with the predetermined shape, is being arranged on the split mold 20, the mold is clamped while bowing air into the parison 17 preliminarily, thereafter, the air is blown into the parison 17 fully to mold the main body 12 of a molded form and the decorative sheet 14 is bonded to the predetermined position of the surface of the main body 12 of the molded form, then a coating layer 13 is arranged. Subsequently, the terminal sections of the molded form main body 12 and the decorative sheet 14 are rolled to the inside thereof and the molded form is cooled for a predetermined period of time, then, the terminal sections are processed whereby the molded form 12 may be obtained.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a decorated molded product made of synthetic resin and formed by blow molding, in which a decorated coating layer is disposed on the surface of the molded product body. Regarding the molding method, for example, a decorative molded product suitable for manufacturing a console box of an automobile interior product, etc., which has a decorative coating layer with a concavo-convex pattern on the surface that can improve the appearance and feel. Regarding the molding method.

<Prior Art> Conventionally, molding of this type of molded product has been carried out as follows, as shown in FIGS. 9 to 11.

First, a parison 7 made of a synthetic resin material for molding the molded product body 2 is extruded from an extruder 6 between a mold 8 made of a split mold 9φ10, and a parison 7 made of a synthetic resin material that will become the covering layer 3 is extruded. A decorative sheet 4 whose surface is decorated with a predetermined uneven pattern is placed between a parison 7 and a predetermined split mold 1.
Place it between o.

Thereafter, the mold is clamped while blowing air into the parison 7 (preliminary blowing).

After the mold is clamped, air is further blown into the parison 7 (wood blowing) to form the molded product body 2.
A decorative molded product 1 was formed by disposing a covering layer 3 made of a decorative sheet 4 on a predetermined portion of the surface.

<Problems to be solved by the invention> However, in the conventional molding method, when the mold is clamped, the parison 7 is in a softened state and is more easily deformed than the decorative sheet 1-4. The decorative sheet 4 is in contact with substantially the entire back surface of the sheet 4 and substantially the entire mold surface 9a of the split mold 9, and the periphery of the decorative sheet 4 is held between the split molds 9 and 10 and is pressed by the parison 7 to form the split mold. This results in a slight bulge into the concave mold surface 10a of lO. Then, during main air blowing after mold clamping, the parison 7 is first pressed against the entire surface of the mold surface 9a of the split mold 9, and then the parison 7 stretches the decorative sheet 4 while stretching the mold surface 10a of the split mold 10. The molded article 1 was formed by pressing the molded article 1 into contact with the molded article 1.

Therefore, in the conventional molding method, the decorative sheet 4 is stretched by the parison 7 after the mold is clamped, and is finally placed in the mold 8.
Since the molded product 1 is molded by pressing the decorative sheet 4 against the mold surface 10a, if the decorative sheet 4 is not pressed smoothly against the mold surface 10a, the decorative sheet 4 and the mold 8 (split mold surface 10a), and when the air accumulates, unnecessary parts 5 are formed on the surface of the coating layer 3 of the molded product 1, resulting in a defective product. .

In addition, in the conventional molding method, the decorative sheet 4 is stretched and molded by the parison 7 during molding, and if the decorative sheet 4 is decorated with an uneven pattern in advance,
The pattern was to be ruined.

Furthermore, in the conventional molding method, the coating layer 3 on the surface of the molded product 1
When forming a small R shape or a complicated R shape, or when the shape of the molded product 1 itself becomes deep (split mold 10
(in cases where the mold surface 10a is deeply recessed), the decorative sheet 4
A predetermined shape is formed on the mold surface lOa to which is pressed,
However, even if the decorative sheet 4 has extensibility, the decorative sheet 4 cannot follow the mold surface 10a only by the pressing force from the parison 7, and its rounded shape may become dull, wrinkled, or torn. There were cases where this occurred.

This invention solves the above-mentioned problems, and it is possible to prevent air accumulation between the coating layer and the mold during molding, prevent defective products due to air accumulation, and also improve the pattern of the coating layer. In addition, when the coating layer is shaped into a small R shape or a complicated R shape, or when the shape of the molded product itself becomes deep, the coating layer can be shaped without any problems. The purpose of this invention is to provide a method for molding decorative molded products.

Means for Solving the Problems> In the method for molding a decorated molded product according to the present invention, a decorated coating layer is disposed on the surface of the main body of a molded product made of synthetic resin and formed by blow molding. A method for molding a decorative molded product includes: a sheet heating step of heating a sheet obtained by molding a synthetic resin; a sheet pre-shaping step of shaping the sheet into a predetermined shape after the sheet heating step; and a sheet pre-shaping step. There is a sheet reheating process in which the sheet is reheated after the process, and a plurality of degassing holes and a decorative mold surface for sheet decoration are formed in predetermined parts of the mold for molding the molded product body, and this mold is A decorative sheet forming step in which the sheet after the sheet reheating step is vacuum-formed to decorate the surface and shaped into a predetermined shape, and a decorative sheet after the decorative sheet forming step is The above-mentioned problems can be solved by providing a molded product body forming step in which the molded product body is molded while placed in a mold, and a covering layer made of a decorative sheet is provided on the surface of the molded product body. This is to solve the problem.

<Operations and Effects of the Invention> In the method for molding a molded product according to the present invention, during molding of the molded product body, the decorative sheet serving as the covering layer has already passed through the decorative sheet forming process and is used for molding the molded product body. The molded product is vacuum formed into a predetermined shape using a mold, and the molded product body is molded with the shaped decorative sheet placed in the mold. Air is sucked from between the sheet and the mold, so no air pockets occur.

In addition, in the forming process, the decorative sheet is shaped into a predetermined shape by a mold for forming the main body of the molded product, and at the same time its surface is decorated with a predetermined uneven pattern, and in this state, the surface of the main body of the molded product is Since it is a covering layer, it does not stretch a conventional sheet that has been decorated with an uneven pattern, so the pattern will not sag.

Furthermore, the decorative sheet that becomes the covering layer is softened through a sheet heating process, then pre-shaped in a subsequent sheet heating process, and then softened again through a reheating process. Since the mold is formed into a predetermined shape by vacuum forming using a mold for forming the main body of the molded product, the mold for forming the main body of the molded product can be formed without sagging, wrinkles, or tears during vacuum forming. Therefore, the molding method for decorative molded products according to the present invention does not create air pockets between the coating layer and the mold during molding, and prevents the occurrence of defective products due to air pockets. It can also prevent the pattern of the coating layer from sagging.
1-.Furthermore, when the coating layer is shaped into a small R shape or a complicated R shape, or when the shape of the molded product itself becomes deep, the coating layer can be shaped without any trouble.

<Example> Hereinafter, one embodiment of the present invention will be described based on the drawings.

The blow molded product molded in the example is a molded product 11 having an inverted U-shaped cross section as shown in FIG.
This is used as a console box for automobile interior parts, and is composed of a blow-molded molded product body 12 and a covering layer 13 disposed on its surface, and is deeper than conventional products and has a corner of the covering layer 13. The part has a small R shape.

The molded product main body 12 is molded from a parison 17 made of PP, and has hollow parts 12ae and 12a on both sides of the cross section.
and a contact portion 12b in the center thereof.

The covering layer 13 is a sheet 40 obtained by molding a synthetic resin as shown in FIG.
14, and this decorative sheet 14 is attached to the molded product body 1.
It is arranged and formed on two surfaces.

Sea 1 = 40 has a surface layer 40a made of soft PVC to give a soft feel to the surface, and a back layer 40b made of synthetic fiber cloth with a woolen finish on the back side, and has elasticity. , and is made of a material that softens when heated.

When the surface layer 40a provides a soft feel, the surface layer 40a is made of soft P.
In addition to VC, a foam such as PVC-PP with a skin layer on the outer surface may be used.
Hard materials may be used to create any kind of different feel.

The back layer 40b is formed on the parison 17 during molding of the molded product body 12.
It is formed for the purpose of joining the sheet 40 (14) and the molded product main body 12 without using an adhesive by a so-called anchoring effect by inserting a part of the mesh into the mesh, and it is not possible to use a wool processing. It does not have to be a fabric coated with a polyurethane, but may also be a simple non-woven fabric, or a foamed material such as PP-PVC as long as it is porous.

Next, regarding the mold 18 used for molding this molded product 11 (see Figures 1 and 5), this mold 18 has a convex mold surface 19a and a concave mold surface 20a, respectively, and is a split mold. 19 and 20, and two slide cores 21 and 21 for terminal processing of the molded product 11.

In particular, the split mold 20 for molding the coating layer 13 side of the molded product 11 has a large number of degassing holes 20b (about 1 to 1007 Lm in opening diameter) communicating from the mold surface 20a to the outer surface of the split mold 20.
It is made of a porous body such as ceramic with

In addition, the mold surface 20a of the split mold 20 is deeply perforated so that the deep molded product 11 can be molded, and the coating layer 13 can be formed into a predetermined small R shape, and the A predetermined processed surface is formed so that a predetermined uneven pattern such as a grain or a stitch can be transferred to the surface of the material 40.

Note that 22 is a lid that covers the outer surface of the 10% mold 2o when sucking air in the mold 18 through the degassing hole 20b, and is connected to a suction means such as a vacuum pump (not shown). .

Next, the molding method of the example will be described.

First, as shown in FIG. 3, the sheet 40 is heated and softened by the heater panels 23 (sheet heating step).

Once the sheet 40 has been softened, the heater panels 23 are removed as shown in FIG. The sheet 40 is set in a wooden mold 24 having a smaller shape than the concave portion and vacuum-formed to shape the sheet 40 into a predetermined shape (sheet pre-shaping step).

In addition, in this sheet preforming process, in the example,
Although this is carried out using vacuum forming, it goes without saying that the sheet 40 may be formed into an i-defined shape by press forming using a predetermined mold.

Then, the pre-shaped sheet 40 is removed from the wooden mold 24, and as shown in FIG. Insert sheet 40 between -25 and sea) 40
is reheated to soften it (sheet reheating process).

Once the sheet 40 has softened, the heater panels 25 and 25
is removed from the mold 18, and as shown in FIG. 6, a sheet 40 is vacuum formed using a suction means (not shown) and a split die 2o (decorative sheet forming step). At that time, C) 40
Since it has already been softened and has been formed into a certain shape in the sheet pre-forming process, even if the split mold surface 20a is deeply perforated and has a small R shape, it will not sag, wrinkle or tear. etc. without causing mold surface 20a.
As a result, a predetermined uneven pattern is transferred and the sheet is shaped into a predetermined shape to become the decorative sheet 14.
At this time, since the air existing between the decorative sheet 14 and the split mold surface 20a is sucked away, no air pocket exists between them.

Then, with the decorative sheet 14 placed in the split mold 2o, as shown in FIG. The mold is clamped while pre-blowing, and after clamping, the seventh
As shown in the figure, air is blown into the parison 17 to form the molded product body 12, and the decorative sheet 14 is bonded to a predetermined portion of the surface of the molded product body 12 to provide the coating layer 13 ( molded product body molding process).

Thereafter, the slide cores 21 are moved to roll up the end portions of the molded product body 12 and the decorative sheath 14, and either create a thin crease in the portions or cut the portions (see Fig. 8). After cooling for a predetermined period of time, if the end portions are treated, a molded product 11 as shown in Figure 1 13-2 can be obtained. Therefore, in the molding method of the embodiment, the sheet 40 is However, since it is vacuum formed in two stages, even if it is deep drawing and a small R shape is formed, there will be no air pockets between it and the mold surface 20a, and the predetermined shape will be achieved without any problem. At the same time, a predetermined uneven pattern is transferred by the mold surface 20a, and the molded product main body 12 is molded in this state, so that the same effects as described in the section of the operation and effect of the invention described above can be obtained. achieve.

In addition, in the example, 1 to 1 was added to the split mold 20 used for molding.
Although a large number of degassing holes 20b having an opening diameter of about OOILm are shown, the opening diameter of the degassing holes 20b may be made larger as long as unnecessary opening marks are not left on the decorative sheet 14.

Further, in the embodiment, the coating layer 13 is disposed on the convex outer surface of the molded product main body 12, but a molded product in which the coating layer 13 is disposed on the concave outer surface of the molded product main body 12 is shown. It goes without saying that the present invention may be applied to molding.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the present invention, and is a sectional view showing a state in which parisons are arranged before molding the main body of the molded product, Fig. 2 is a sectional view of a molded product molded according to the same embodiment, and Fig. 3 4 is a cross-sectional view showing the sheet preforming process of the same example; FIG. 5 is a cross-sectional view showing the sheet reheating process of the same example. , FIG. 6 is a cross-sectional view showing the process of forming the decorative sheet of the same example, FIG. 7 is a cross-sectional view showing the state of main air blowing during the process of forming the molded product body of the same example, and FIG. A cross-sectional view showing a state in which the slide core is moved during the molding process of the molded product body of the same example, FIG. 9 is a longitudinal cross-sectional view of the conventional example when the mold is opened, and FIG. 1O is a cross-sectional view of the same. FIG. 11 is a cross-sectional view showing a state during main air blowing in a conventional example. 1.11... Molded product, 2.12... Molded product body, 3.13... Covering layer, 4.14... Decoration sheet, 7.17... Parison, 8.18 ... Mold, 9, 10, 19, 2o... Split mold, 20a... (For decoration) mold surface, 20b... Deaeration hole. Patent applicant

Claims (1)

[Scope of Claims] A method for molding a decorative molded article made of synthetic resin and formed by blow molding, in which a decorated coating layer is provided on the surface of the molded article body, characterized by comprising the following steps: A method for forming decorative molded products. (a) Sheet heating step of heating a sheet obtained by molding a synthetic resin. (b) A sheet pre-shaping step of shaping the sheet into a predetermined shape after the sheet heating step. (c) A sheet reheating step of reheating the sheet after the sheet preforming step. (d) A plurality of deaeration holes and a decorating mold surface for decorating the sheet are formed in a predetermined portion of a mold for molding the molded product body, and the mold is used to perform the sheet reheating process. A decorative sheet forming step of vacuum forming the sheet to decorate the surface and shaping it into a predetermined shape. (e) The molded product body is molded with the decorative sheet after the decorative sheet forming step arranged in the mold, and a coating layer made of the decorative sheet is formed on the surface of the molded product body. Molding process for the main body of the molded product.