JP4334075B2 - Synthetic resin sheet molding equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin sheet molding apparatus.
[0002]
[Prior art]
Conventionally, for example, two layers of heated synthetic resin sheets are placed between a pair of molds, and after clamping, the tip of a needle nozzle is inserted between the two layers of synthetic resin sheets to blow air, 2. Description of the Related Art There is known a molding apparatus that compresses a synthetic resin sheet into a hollow shape between molding dies. Moreover, this type of molding apparatus has a cutting blade whose tip is in contact with the other sealing surface among the sealing surfaces facing each other at the time of mold clamping. A trimming process for cutting and removing unnecessary portions around the sheet is performed. However, only the portion corresponding to the needle nozzle among the cutting blades formed on the other sealing surface is cut away in order to avoid interference with the needle nozzle.
[0003]
[Problems to be solved by the invention]
However, in such a conventional technique, the portion corresponding to the needle nozzle of the trimming cutting blade is cut out, so that only this portion is not completely cut, and after the molding, the cutter is recut. The cutting work by etc. may be needed. Therefore, it is disadvantageous in terms of work efficiency and also adversely affects the surface quality of the molded product.
[0004]
The present invention has been made paying attention to such a conventional technique, and provides a synthetic resin sheet molding apparatus that completes the trimming process on the entire circumference simultaneously with mold clamping.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, a plurality of heated synthetic resin sheets are disposed between a pair of molds, and the tip of a needle nozzle is inserted between the synthetic resin sheets to blow air, thereby hollowing out the synthetic resin sheet. A molding apparatus for a synthetic resin sheet that is pressure-formed into a shape, wherein a convex portion is formed on one sealing surface among the opposing sealing surfaces of the molding dies, and the convex portion can protrude into the molding die. A cross-sectional shape in which a needle needle is provided in a penetrating state, and a cutting blade is formed on the other sealing surface to contact the one sealing surface, and the cutting blade corresponds to the convex portion and allows the needle nozzle to protrude. The height of the recess of the cutting blade from the other sealing surface is set to be smaller than the total thickness of the plurality of synthetic resin sheets.
[0006]
According to the first aspect of the present invention, since the convex portion having the needle nozzle is formed on one sealing surface and the cutting blade is formed on the other sealing surface, the entire trimming process is completed simultaneously with the mold clamping. Moreover, since the height of the cutting blade that becomes the clearance between the convex portion and the concave portion is smaller than the total thickness of the synthetic resin sheet disposed between the molds, the convex portion partially presses the synthetic resin sheet, and the peripheral portion thereof. Excitement. Therefore, when the needle nozzle is protruded, the raised synthetic resin sheet can be stabbed and air can be blown between the synthetic resin sheets.
[0007]
In the invention according to claim 2, the convex portion and the concave portion are semicircular in cross section.
[0008]
According to the second aspect of the present invention, since the convex portion and the concave portion are semicircular in cross section, even if a slight misalignment in the horizontal direction occurs between them, the positions are corrected while being clamped. It matches at the normal position, and the convex part and the concave part are not twisted.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the present invention will be described below with reference to FIGS. This embodiment relates to an apparatus for forming two synthetic resin sheets 1 and 2 into a hollow shape. Each of the synthetic resin sheets 1 and 2 is made of a non-breathable olefin resin, and is a material obtained by adding a filler (mica) to a recycled polypropylene material. A polyester nonwoven fabric having a higher melting temperature than the synthetic resin sheets 1 and 2 may be interposed between the two synthetic resin sheets 1 and 2. Further, a synthetic resin skin material may be further adhered to one side or both sides of the synthetic resin sheets 1 and 2.
[0010]
On the other hand, the molding apparatus is formed of a lower mold 3 and an upper mold 4 as “molding molds”, and a cavity 5 is formed between the lower mold 3 and the upper mold 4. On the entire circumference of the lower mold 3 and the upper mold 4, seal surfaces 6 and 7 that are opposed to each other at the time of mold clamping are formed. Further, a convex portion 8 having a semicircular cross section is formed on a part of the seal surface 7 of the upper mold 4. A needle nozzle 9 that can freely protrude into the cavity 5 is provided in a penetrating state below the convex portion 8.
[0011]
Further, a cutting blade 11 is formed on the seal surface 6 of the lower mold 3 so that the tip abuts on the entire circumference of the seal surface 7 of the upper mold 4 including the convex portion 8. As shown in FIG. 4, the height h of the cutting blade 11 is the clearance between the convex portion 8 and the concave portion 10, and the height h from the seal surface 6 of the concave portion 10 of the cutting blade 11 is two. The total thickness d of the synthetic resin sheets 1 and 2 is set to be smaller. The concave portion 10 is formed on the cutting blade 11 and has a semicircular cross section corresponding to the convex portion 8.
[0012]
Next, an actual molding method will be described. First, the synthetic resin sheets 1 and 2 are heated to be in a molten state. This heating may be performed after the synthetic resin sheets 1 and 2 are overlapped, or may be heated individually or may be overlapped.
[0013]
The heated synthetic resin sheets 1 and 2 are placed between the lower mold 3 and the upper mold 4, and then the upper mold 4 is lowered to clamp the mold. Since the cutting blade 11 is formed on the seal surface 6 of the lower mold 3, the trimming process of the entire circumference of the synthetic resin sheets 1 and 2 is completed simultaneously with the mold clamping, and the unnecessary portions around are separated. In addition, when the upper mold 4 and the lower mold 3 are clamped, the convex portion 8 and the concave portion 10 are semicircular in cross section, so even if a slight misalignment in the horizontal direction occurs between them, While the positions are corrected at the time of mold clamping, they match each other at the normal positions, and the convex portions 8 and the concave portions 10 are not twisted.
[0014]
Then, after trimming the synthetic resin sheets 1 and 2, the needle nozzle 9 protrudes into the cavity 5 and is inserted into the upper synthetic resin sheet 2. Infuse. At this time, since the height h of the cutting blade 11 serving as a clearance between the convex portion 8 and the concave portion 10 is smaller than the total thickness d of both the synthetic resin sheets 1 and 2, the convex portion 8 is not fixed to the synthetic resin when the molds are clamped. The sheets 1 and 2 are strongly pressed, and the peripheral portion 2a (see FIG. 5) rises. Therefore, when the needle nozzle 9 is protruded, the peripheral portion 2 a of the raised synthetic resin sheet 2 can be stabbed and air can be blown between the synthetic resin sheets 1 and 2.
[0015]
When air is blown between the synthetic resin sheets 1 and 2, the synthetic resin sheets 1 and 2 are in close contact with the inner surfaces of the upper mold 4 and the lower mold 3, respectively, and become hollow while being thermoformed. When the thermoforming of the synthetic resin sheets 1 and 2 is completed, the inside of the mold is returned to atmospheric pressure, and then the upper mold 4 and the lower mold 3 are opened, and the molded product is taken out.
[0016]
【The invention's effect】
According to the first aspect of the present invention, since the convex portion having the needle nozzle is formed on one sealing surface and the cutting blade is formed on the other sealing surface, the entire trimming process is completed simultaneously with the mold clamping. Moreover, since the height of the cutting blade that becomes the clearance between the convex portion and the concave portion is smaller than the total thickness of the synthetic resin sheet disposed between the molds, the convex portion partially presses the synthetic resin sheet, and its peripheral portion. Excitement. Therefore, when the needle nozzle is protruded, the raised synthetic resin sheet can be stabbed and air can be blown between the synthetic resin sheets.
[0017]
According to the second aspect of the present invention, since the convex portion and the concave portion are semicircular in cross section, even if a slight misalignment in the horizontal direction occurs between them, the positions are corrected while being clamped. It matches at the normal position, and the convex part and the concave part are not twisted.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a mold showing a state before mold clamping.
2 is a cross-sectional view showing a state after clamping of the mold shown in FIG. 1;
FIG. 3 is an exploded perspective view showing a lower mold and an upper mold.
FIG. 4 is an enlarged cross-sectional view showing a state before a synthetic resin sheet is sandwiched between a convex portion and a concave portion.
5 is an enlarged cross-sectional view showing a state after a synthetic resin sheet is sandwiched between a convex portion and a concave portion in FIG.
6 is an enlarged cross-sectional view showing a state in which the needle nozzle in FIG. 5 is protruded.
7 is an enlarged cross-sectional view showing a state in which air is blown by the needle nozzle of FIG. 6. FIG.
[Explanation of symbols]
1, 2 Synthetic resin sheet 3 Lower mold (mold)
4 Upper mold (molding mold)
6, 7 Seal surface 8 Convex part 9 Needle nozzle 10 Concave part 11 Cutting blade h Cutting blade height d Total thickness of the synthetic resin sheet

Claims (2)

A synthetic resin sheet in which a plurality of heated synthetic resin sheets are placed between a pair of molds, and the tip of a needle nozzle is inserted between the synthetic resin sheets and air is blown into the hollow, thereby forming the synthetic resin sheet into a hollow shape. The molding apparatus of
Among the sealing surfaces facing each other of the molding dies, a convex portion is formed on one sealing surface, and a needle nozzle that can freely protrude into the molding die is provided in the convex portion in a penetrating state.
Forming a cutting blade in contact with the one sealing surface on the other sealing surface, and forming a concave portion having a cross-sectional shape corresponding to the convex portion and allowing the needle nozzle to protrude on the cutting blade;
An apparatus for molding a synthetic resin sheet, wherein a height of the concave portion of the cutting blade from the other sealing surface is set smaller than a total thickness of the plurality of synthetic resin sheets. A synthetic resin sheet molding apparatus according to claim 1,
An apparatus for molding a synthetic resin sheet, wherein the convex part and the concave part are semicircular in cross section.

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