JP3889488B2 - Structure of seal part of powder slush molding device and molding method of seal part - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a seal portion of a powder slush molding apparatus and a method for forming the seal portion.
[0002]
[Prior art]
A powder slush molding method is widely used for molding a plastic film used for the surface of foamed molded articles.
[0003]
In the powder slush molding method, as shown in FIG. 5, a powder slash comprising an electroformed powder slash molding die 41 having a molded product-shaped mold surface 42 and a bucket 51 having a plastic powder container 52. A molding apparatus 40 is used. The powder slush molding device 40 is attached to a rotating device (not shown) and closed, and the mold surface 42 of the powder slush molding die is heated to a predetermined temperature to rotate the molding device 40 a required number of times. Thereby, the plastic powder P in the plastic powder container 52 is adhered to the mold surface 42 to form a molten resin film, and then cooled to cure the molten plastic film on the mold surface 42, and the cured product is demolded as desired. To obtain a plastic coating. Reference numeral 43 in the figure denotes a heat medium pipe disposed on the outer surface of the powder slush molding die 41, which heats the die surface 42 through heating oil or the like.
[0004]
By the way, in the powder slush molding device 40, it is necessary to prevent the plastic powder P from leaking from between the bucket 51 and the slush molding die 41 during powder slush molding. Therefore, conventionally, a sealing portion 44 is provided at the opening periphery of the powder slush mold 41 and the bucket 51. The structure of the seal portion 44 is such that flange-like seal surfaces 45 and 55 are formed on the opening rims of the powder slush mold 41 and the bucket 51, and the bucket-side seal surface 45 has a rectangular cross section made of silicon sponge or the like. A string-shaped elastic sealing material 46 is fixed, and the both sealing surfaces 45 and 55 are pressure-bonded via the elastic sealing material 46.
[0005]
However, when the powder slash mold 41 is for molding a large plastic film such as the skin of an instrument panel, for example, the distance along the seal surface 45 at the periphery of the opening is long, and the film shape for forming the opening shape is also used. Since it is complicated depending on the shape, it is difficult to make the sealing surface 45 uniform at the time of electroforming. Therefore, when the powder slush molding device 40 is attached to the rotating device and closed, the gap S between the seal surface 45 of the mold 41 and the seal surface 55 of the bucket 51 is not constant, and the string (band) having a constant cross-sectional shape. In the shape of the elastic sealing material 46, there is a problem that the seal surfaces 45 and 55 cannot be completely sealed.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above points, and can reliably seal the seal portion between the powder slush mold and the bucket, and can easily form the seal portion. A method for forming a seal portion is provided.
[0007]
[Means for Solving the Problems]
The invention of claim 1 comprises a powder slush mold having a molded product-shaped mold surface and a bucket having a plastic powder container, and the bucket and the powder via a seal provided at the periphery of the opening of the bucket. In a powder slush molding device in which the sealing surfaces of the slush molding dies at the peripheral edges of both openings are pressure-bonded, the sealing portion is pressed between the bucket and the sealing surface of the powder slush molding die to be shaped and cured. A structure of a seal portion of a powder slush molding device, comprising: a resin seal base material; and an elastic seal material that is affixed to the surface of the seal base material and has a lower hardness than the seal base material Concerning.
[0008]
The invention of claim 2 swells a curable resin on the sealing surface of the opening periphery of a bucket having a plastic powder container, and seals the curable resin between the sealing surface of the opening periphery of the bucket and the opening periphery of the powder slush mold. Pressing between the surfaces, the curable resin is shaped into a surface shape that matches the sealing surface of the opening rim of the powder slush mold, and the curable resin is cured and sealed to the sealing surface of the opening periphery of the bucket Forming a base material, and then sticking an elastic sealing material having a hardness lower than that of the sealing base material to the surface of the sealing base material to form a sealing part. According to the molding method.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail with reference to the accompanying drawings. In order to avoid complicated explanation, an example of the method for molding the seal portion according to the invention of claim 2 will be described together with the description of the embodiment of the powder slush molding apparatus according to the invention of claim 1.
[0010]
FIG. 1 is a cross-sectional view showing a powder slush molding device in one embodiment of the present invention, FIG. 2 is a cross-sectional view showing a state in which a curable resin is raised on the seal surface in one embodiment of the seal portion molding method of the present invention, FIG. 3 is a cross-sectional view showing a state in which the curable resin is pressed in the same example, and FIG. 4 is a cross-sectional view showing a state in which an elastic sealing material is adhered in the same example.
[0011]
As shown in FIG. 1, a powder slush molding device 10 according to the present invention is composed of a powder slush molding die 11 and a bucket 21, is attached to a rotating device (not shown), is closed, and is rotated during powder slush molding. The
[0012]
The powder slush mold 11 is made of an electric mold, has a molded product-shaped mold surface 12 that is recessed in a concave shape, and an opening 13 is formed toward the bucket 21 side. A flange-like sealing surface 15 projecting outward is formed on the opening periphery of the opening 13, and a sealing portion 16 is configured by a sealing base material 26, an elastic sealing material 27, and a sealing surface 25 of the bucket 21, which will be described later. To do. Further, on the back side of the mold surface 12 of the powder slush mold 11, a heat medium circulation pipe is disposed as a heating means H for heating the mold surface 12 during powder slush molding.
[0013]
The bucket 21 contains plastic powder for powder slush molding made of vinyl chloride resin or the like, supplies plastic powder to the mold surface 12 of the powder slush molding die 11 at the time of powder slush molding, and removes excess plastic powder. In order to collect, a plastic powder container 22 that is recessed in a concave shape is formed, and an opening 23 is formed toward the mold 11. The opening 23 has a size that matches the opening 13 of the powder slush mold 11, and a seal surface 25 that faces the seal surface 15 of the powder slush mold 11 is formed on the periphery of the opening.
[0014]
A sealing base material 26 and an elastic sealing material 27 are laminated on the sealing surface 25 of the bucket 21 so as to surround the opening 23 of the bucket 21. When the powder slush molding device 10 is attached to the rotating device and closed, the seal base material 26 corrects the non-uniformity of the gap between the seal surface 25 of the bucket 21 and the seal surface 15 of the powder slush mold 11, The gap between the surface of the sealing base material 26 and the sealing surface 15 of the powder slush mold 11 is made uniform to ensure good sealing performance between the bucket 21 and the powder slush mold 11. The sealing substrate 26 is formed of a curable resin string (band), and in this embodiment, a heat-resistant epoxy resin (manufactured by Sun Module, CA-22S (main agent), CA-50B (curing agent)) is used. I use it.
[0015]
As shown in FIG. 2, the molding of the sealing base material 26 of the sealing portion 16 is performed by first raising the curable resin 26a over the entire circumference of the opening 23 on the sealing surface 25 of the bucket 21, and then in FIG. As shown, the curable resin 26 a is pressed by the seal surface 25 of the bucket 21 and the seal surface 15 of the powder slush mold 11. At this time, the bulging amount of the curable resin 26a is set to be larger than the target thickness of the sealing base material 26, and the powder slush molding die 11 and the bucket 21 are formed between the sealing surfaces 15 and 25 during the powder slush molding. It is set so as to be the same as the closed state or narrower by several millimeters.
[0016]
By pressing the curable resin 26 a by the seal surfaces 15, 25, the curable resin 26 a is shaped into a surface shape that matches the seal surface 25 of the powder slush mold 21. In this state, the curable resin 26a is cured with a curing agent contained in the curable resin 26a. After the powder slush mold 11 and the bucket 21 are separated, the sealing surface 25 of the bucket is fixed. The seal base 26 is fixedly formed. During the pressing, a release agent or the like is applied to the seal surface 15 of the powder slush mold 11 so that the curable resin 26a does not adhere to the seal surface 15 of the powder slush mold 11.
[0017]
The elastic sealing material 27 is for securely sealing between the sealing surface 15 of the powder slush molding die 11 and the sealing base material 26 on the sealing surface 25 of the bucket 21 at the time of powder slush molding, as shown in FIG. After the sealing base material 26 is molded, it is laminated and integrated on the surface of the sealing base material 26 with an adhesive or the like. The elastic sealing material 27 is preferably made of an elastic material having a lower hardness than the sealing base material 26 and is excellent in heat resistance such as silicon sponge.
[0018]
The elastic sealing material 27 has a gap between the surface of the sealing base material 26 and the sealing surface 15 of the powder slush molding die 11 at the time of powder slush molding. And since it becomes uniform over the perimeter of the opening part 23 of the bucket 21, even if it is a thing with a fixed cross-sectional shape, between both the sealing surfaces 15 and 25 can be sealed reliably. Therefore, in this embodiment, the sealing base material 26 has a thickness of 10 mm, while the elastic sealing material 27 is a string (band) having a rectangular cross-sectional shape having a thickness of 6 mm and a width of 10 mm. It is glued to.
[0019]
It should be noted that the sealing portion 16 is used when the sealing base material 26 and the elastic sealing material 27 are damaged due to long-term use of the powder slush molding device 10 or when the powder slush molding die is replaced. Then, the elastic sealing material 27 may be removed and the sealing portion may be formed again in the same manner as described above.
[0020]
【The invention's effect】
As shown and described above, according to the structure of the seal portion of the powder slush molding device and the molding method of the seal portion according to the present invention, the surface of the seal base material fixed to the seal surface of the bucket and the seal of the powder slush mold Since the distance between the surface and the bucket is molded uniformly, when the powder slush mold and the bucket are closed via the elastic sealing material adhered to the surface of the sealing substrate, both the sealing surfaces match with no gap, It is possible to reliably seal between the powder slush mold and the bucket. In addition, the sealing base material on the sealing surface of the bucket is formed so that the surface shape of the sealing surface of the powder slush mold matches the surface shape. Evenly added to the elastic sealing material, local deterioration of the elastic sealing material hardly occurs, and good sealing performance of the sealing portion can be maintained for a long time.
[0021]
Further, in the present invention, the seal portion is configured with a simple structure and is not fixed by a metal fitting or the like, and therefore, work such as replacement can be easily performed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a powder slush molding apparatus according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a state in which a curable resin is raised on a seal surface in an embodiment of a method for forming a seal portion of the present invention.
FIG. 3 is a cross-sectional view showing a state where a curable resin is pressed in the same embodiment.
FIG. 4 is a cross-sectional view showing a state where an elastic sealing material is adhered in the same embodiment.
FIG. 5 is a cross-sectional view showing a powder slush molding device having a conventional seal portion.
6 is a cross-sectional view of the main part showing the vicinity of the opening periphery of FIG. 5. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Powder slush shaping | molding apparatus 11 Powder slush shaping | molding die 12 Mold surface 13 Powder slush molding die opening 15 Powder slush molding die sealing surface 16 Sealing portion 21 Bucket 22 Plastic powder accommodating portion 23 Bucket opening 25 Bucket sealing surface 26 Seal base material 27 Elastic seal material

Claims (2)

A powder slush mold having a molded product-shaped mold surface and a bucket having a plastic powder container, and both the peripheral edges of the bucket and the powder slash mold through a seal portion provided at the peripheral edge of the opening of the bucket In powder slush molding equipment where the sealing surface of
The seal portion is pressed between the bucket and the seal surface of the powder slush mold, and is formed and cured, and is pasted on the surface of the seal substrate. A structure of a seal portion of a powder slush molding device, characterized by comprising an elastic seal material whose hardness is lower than that of a base material. Raise the curable resin on the sealing surface of the opening periphery of the bucket having the plastic powder container,
The surface shape of the curable resin is pressed between the sealing surface of the opening periphery of the bucket and the sealing surface of the opening periphery of the powder slush molding die, and the curable resin is matched with the sealing surface of the opening periphery of the powder slush molding die And forming the sealing base material on the sealing surface of the opening peripheral edge of the bucket by curing the curable resin,
Next, a method for forming a seal portion of a powder slush molding apparatus is characterized in that an elastic seal material having a hardness lower than that of the seal substrate is adhered to the surface of the seal substrate to form a seal portion.

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