JP2003062894A - Skin sheet and blow-molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a gas from being sealed in a space between a skin sheet and a resin hollow part, even when the skin sheet is of such a type that it has an interposed cushioning layer which is compressed during molding and restored to its original shape after molding and provide such advantages that small holes like pinholes need not be formed and a smooth surface appearance can be obtained and further, the skin sheet can be preformed, in the blow- molded product obtained by blow-molding the resin hollow part in one piece with the laminated skin sheet. SOLUTION: The skin sheet is composed of a hard skin layer 3 and the cushioning layer 6 which is laminated on the skin layer 3 and has a cut groove 8 molded and opened on the surface of the cushioning layer 6. The blow-molded product has the resin hollow part on which the skin sheet is laminated with such a structural feature that the skin sheet is molded in one piece with the resin hollow part so as to make the cut groove 8 of the cushioning layer 6 face opposite to the resin hollow part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow-molded article, for example, a blow-molded article, which is suitable for being integrally laminated, and a blow-molded article obtained by integrally bonding such a skin sheet.

[0002]

2. Description of the Related Art As a conventional technique, a gas emitted by a molten resin and a gas between a sheet and a molten resin parison are discharged, and a fine penetration is made to the sheet in order to tightly integrate the sheet and the resin. Blow-molded product having holes (Japanese Patent Laid-Open No. 9-242242)
-24539 gazette) exist.

[0003]

However, in the above-mentioned prior art, the small holes deteriorate the appearance and make the preform difficult. Further, the foamed sheet, which is an example of the skin sheet, has a problem that it is difficult to apply the small holes because the foamed portion is compressed and the small holes are closed.

In view of such circumstances, the present invention forms a kerf on one surface of a skin sheet, and integrally molds the kerf forming surface so as to face the hollow resin portion, so that the kerf passes through the kerf. Exhaust is possible along the surface direction of the skin sheet, and even when enclosing air when stacking the sheet and the resin hollow part or blow molding a resin that generates a lot of gas, the skin sheet It is an object of the present invention to provide a skin sheet and a blow-molded product that do not cause problems such as being integrally formed and lifted up, and that also solve the problem of appearance due to the formation of small holes in the design surface.

[0005]

The present invention is intended to solve the above-mentioned problems, and employs the following technical means. In the invention according to claim 1, in a skin sheet having a hard skin layer and a cushion layer laminated on the skin layer, a technical means of providing a kerf formed so as to open on the surface of the cushion layer is adopted. .

In the invention described in claim 2, claim 1
A blow-molded product having a hollow resin portion to which a skin sheet according to claim 1 is attached, wherein the skin sheet and the hollow resin portion are integrally molded so that the kerf of the cushion layer faces the hollow resin portion. It was adopted.

[0007]

1 to 3 show a flat hollow board 1, which is used, for example, as a luggage floor board of an automobile. The material of the board body 2 is AB
Examples thereof include S (acrylonitrile butadiene styrene), PP (polypropylene), and modified PPO (polyphenylene oxide). The skin 3 has a two-layer structure including a skin layer 5 made of PP, vinyl chloride, etc. and a cushion layer 6 made of foamed PP, PE (polyethylene), vinyl chloride, polyurethane, etc., and covers the board body 2 above the parting line 4. It is a thing.

The skin sheet of the present invention will be described below. As an example, the cushion layer 6 has cells 7 that are fine bubbles formed therein, and a kerf 8 having a depth of 0.7 mm to 1 mm is formed on the boundary surface with the board body 2. Various materials such as a foam layer sheet and a cushion sheet can be used for this skin sheet. The depth of the groove depends on the thickness of the cushion layer 6, but (for example, if the cushion layer 6 is 2 mm to 3 mm, the depth of the groove is 0.5 mm to 1 mm). If you cut it completely, you won't get the original effect. Further, the grooves can be formed even before forming the cushion layer 6 before the blow molding.

Next, FIG. 4 is a sectional view for explaining the outline of blow molding. In this blow molding, a cylindrical parison 11 discharged from a nozzle 10 and hanging down is sandwiched by pinches 15 and 15, and a lower portion 11a of the parison 11 is butted and joined.
The mold 12 is sandwiched between the left and right halves 13 and 14, and air is blown into the parison 11 from an air pin (not shown) to perform blow molding. The skin 3 is placed on the right half mold 14 in advance,
It is molded integrally with the parison 11. The parison 11 is
It is melted and generates gas by itself. Therefore, a space 16 is formed between the skin 3 and the parison 11 as shown in FIG. The space 17 is contracted by the stretching of the parison 11 and the skin 3, and the air in the space 17 is discharged out of the mold from the exhaust passage 14a.

The gas in the space 16 is continuously supplied from the parison 11 for a while until the parison 11 cools. If the parison 11 is pushed in the direction of arrow B by the blow pressure and there is no kerf 8 formed on one surface of the cushion layer 6, there is almost no exhaust from the parting line 4, that is, there is almost no gas flow in the direction of arrow D, and there is no space. 16 is compressed on the spot or moves in the direction of arrow C and remains at an arbitrary position between the board main body 2 and the skin 3. When the molded product is taken out of the mold 12, the space 16 expands again, and as shown in FIGS. 6 and 7,
The raised portion 18 is formed. However, since the kerfs 8 are formed, the gas flows in the direction of the arrow D, and the space 16 can be made to be so small that the space 16 is not formed or the raised portion 18 is not formed.

Thus, a blow-molded product having a smooth and good-looking decorative skin adhered thereto can be obtained without forming pinhole-shaped small holes.

Since the kerf 8 does not reach the hard skin 3 and occupies only a part of the entire thickness of the cushion layer 6, the extension of the skin layer 5 is also affected. There is no effect, and the epidermal layer 5 does not generate a locally stretched portion. Further, the cushion layer 6 has the kerf 8
Also, there is no possibility that the cushion layer 6 is divided into parts to form discontinuous parts. Therefore, problems such as deterioration of cushioning properties do not occur. Particularly, since the skin 3 is a laminated sheet of the hard skin layer 5 and the cushion layer 6,
When the cushion layer 6 is released from the compression by the molding die and is restored, when the skin 3 is separated from the board main body portion 2, the presence of the space 16 facilitates the formation of the raised portion 18, and in blow molding, the blowing pressure is usually increased. Is 7 kgf / cm
^Since the pressing force on the cushion layer 6 and the board main body ^{2 is} about 2, the pressing force is hardly applied when the space 16 is present, and a sufficient joining force cannot be obtained.
Since the space 16 is not formed or can be made extremely minute by the above, the formation of the raised portion 18 can be effectively prevented.

FIG. 5 shows an example of the formation pattern of the kerfs 8 formed on one surface of the cushion layer 6, which are formed in parallel in the left-right direction or the up-down direction (FIG. 5 (a) shows the left-right direction), and a grid pattern 5 (b)}, and the slanted one (FIG. 5 (c) is a side shackle, but one side (sneak) may be used}.

The pattern can be formed by passing through a roll provided with a blade having a predetermined shape. For example, as shown in FIGS. 9 and 10, it is also possible to use a plurality of annular blade portions 21 that form the kerfs 9 in the cushion layer 7 by rotating the roll 20.

[0015]

As a result of adopting the above configuration, the present invention provides
The following effects can be obtained. (1) In a blow-molded product in which a skin sheet is laminated and integrally blow-molded, even if the skin sheet has a cushion layer that is compressed during molding and restores after molding, the space between the skin sheet and the resin hollow portion Prevents gas from being enclosed in. (2) It is not necessary to form pinhole-shaped small holes, a smooth surface appearance can be obtained, and a preform for a skin sheet is also possible. (3) A skin sheet exhibiting the effect of (1) or (2) can be obtained with a simple structure.

[Brief description of drawings]

FIG. 1 is a perspective view showing a hollow board which is a blow molded product of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a cross-sectional view showing an enlarged main part of the present invention.

FIG. 4 is a front view showing a section of a mold shown by attaching a skin of the present invention to a blow molding machine.

FIG. 5 is a kerf formation pattern diagram of the present invention.

FIG. 6 is a perspective view of a hollow board showing a place where a conventional raised portion is formed.

7 is a sectional view taken along line BB of FIG.

FIG. 8 is a cross-sectional view of essential parts showing a state during blow molding of the present invention.

FIG. 9 is a perspective view showing a state where a kerf is formed by using a kerf forming blade according to an embodiment of the present invention.

FIG. 10 is an enlarged cross-sectional view of an essential part when forming the kerf of FIG.

[Explanation of symbols]

1 ... Hollow board 2 ... Board main part 3 ... Skin 4 ... Parting line 5 ... Skin layer 6 ... Cushion layer 7 ... Cell 8 ... Cut groove 10 ... Nozzle 11 ... Parison 12 ... Mold 13 Left half mold 14 Right half mold 14a Exhaust passage 15 Pinch 16 Space 17 Space 18 Protrusion 20 Roll 21 Blade

Claims (2)

[Claims] 1. A skin sheet having a hard skin layer and a cushion layer laminated on the skin layer, wherein the cushion layer has cut grooves formed on the surface thereof. 2. A blow-molded article having a resin hollow portion to which the skin sheet according to claim 1 is adhered, wherein the skin sheet is provided in the resin hollow portion such that the kerf of the cushion layer faces the resin hollow portion. A blow molded product characterized by being integrally molded.