JPH0410018Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a plastic panel used for housings of various electrical devices.

Conventional technology Metal panels are widely used in housings of various electrical devices that require heat resistance and rigidity, but even though metal panels have excellent heat resistance and rigidity, they are heavy and There are major drawbacks.

Therefore, hollow plastic panels have traditionally been used instead of metal panels to reduce weight without sacrificing rigidity.
Since it is usually constructed by blow molding, the plastic material used is polyolefin resin such as polyethylene or polypropylene, which is easy to blow mold.

Problems that the invention aims to solve By the way, polyolefin resins such as those mentioned above are suitable for blow molding and have high heat welding strength at the joints during molding, so using this resin can improve rigidity to some extent. Although it is possible to obtain a hollow plastic panel, the problem is that it does not have excellent heat resistance and its rigidity is impaired at high temperatures.

Therefore, polyphenylene ether resin is a plastic that has excellent heat resistance and high bending strength, compressive strength, and impact strength.When blow molding this polyphenylene ether resin to construct a hollow panel, The pinch-off part, which grips and welds opposing parisons during blow molding, has significantly inferior bonding strength compared to the pinch-off part of a polyolefin resin panel, making it impossible to obtain a plastic panel with the desired rigidity and impact strength. This is the actual situation.

In view of these problems, this invention uses blow molding using polyphenylene ether resin with excellent heat resistance, has extremely high joint strength at the pinch-off part, has excellent heat resistance, and does not lose rigidity even at high temperatures. It is an object of the present invention to provide a plastic panel that is not resistant to plastic and has excellent bending strength, compressive strength, and impact strength.

Means for Solving the Problems In order to achieve the above object, the present invention is constructed as follows.

That is, a pair of plates made of polyphenylene resin are separated so that there is a hollow space between them,
The peripheral edge of one plate is bent in the direction of the peripheral edge of the other plate to form a peripheral side, and the peripheral edge of one plate and the peripheral edge of the other plate are bent from the outer ridge line to the inner corner. The plastic panel is characterized in that it is integrally connected by heat welding over the parts.

Function Since the plastic panel according to the present invention is constructed as described above, the area where the periphery of one plate is joined to the periphery of the other plate is large, and heat bonding occurs during blow molding. Even if a polyphenylene ether resin with poor properties is used, the bonding strength of the pinch-off portion can be increased. Therefore, the plastic panel has excellent heat resistance, high rigidity, and excellent bending strength, compressive strength, and impact strength.

Example Embodiments of the present invention will be described with reference to the drawings.

1 and 2, 1 is a plastic panel, and this plastic panel 1
is a pair of plates 1 made of polyphenylene resin.
a and 1b are separated so as to have a hollow portion 2 therebetween, and the peripheral edge of one plate 1a is bent toward the peripheral edge of the other plate 1b to form a peripheral side surface 1c. The bent periphery of one plate 1a and the periphery of the other plate 1b are connected to the outer ridgeline portion 1.
They are integrally connected by heat welding from d to the inner corner 1e. 1f indicates the heat-welded surface. plastic panel 1
A large number of ribs 3 are formed on the other plate 1b, and the ribs 3 reach one plate 1a and are welded thereto. This rib 3 consists of a first stage recess 3a and a second stage recess 3b. Although FIG. 3 shows an example in which the plastic panel 1 is used as the front panel of an electronic copying machine 4, the plastic panel 1 is widely used as a housing member of various electrical devices.

The plastic panel 1 is manufactured by blow molding, as shown in FIGS. 4 and 5. That is, 5 and 6 are a pair of molds, one of which has a cavity 5a on its inner surface for molding one plate 1a of the plastic panel 1, and a cavity 5a on the inner surface of the other mold 6. is the other plate 1
Cavities 6a for molding the ribs 3 are formed respectively, and a large number of protrusions 6b for molding the ribs 3 are formed on the inner surface of the other mold 6. Also,
The pinch-off parts 7 of the pair of molds 5 and 6 are such that the pinch-off part 7a of one mold 5 projects toward the pinch-off part 7b of the other mold 6,
The pinch-off portion 7b of the other mold 6 is connected to the other plate 1
It is the same as the surface forming b. 8 is an extrusion head;
9 is parison.

The parison 9 extruded from the extrusion head 8 is sandwiched between the pair of molds 5 and 6 (Fig. 4), and when the molds 5 and 6 are closed to perform blow molding (Fig. 5), the pair of molds 5, In 6 the plastic panel 1 is molded.
The outer side sandwiched between the pinch-off parts 7 of the molds 5 and 6 becomes a burr 10 that covers the entire circumference of the plastic panel 1;
is pressed from one mold 5 side to the other mold 6 side, becomes compressed, and is heated and welded. Therefore, the heated bonding surface 1f that constitutes the closed circumferential side surface 1c of the plastic panel 1 is a diagonal surface from the outer ridge line 1d to the inner corner 1e, as shown in FIG. In addition, the parison 9, which is pinched by the pinch-off parts 7a and 7b, is pushed toward the cavity side, which is opened approximately 90 degrees, compared to the conventional case where the cavity side of the pinch-off part is opened 180 degrees. Since the joint interface is strongly pressed, the joint strength is significantly improved. FIG. 6 shows the plastic panel 1 removed from the molds 5 and 6 after blow molding, and it appears that burrs 10 are attached all over its circumference.

The plastic material constituting the plastic panel 1 is polyphenylene ether resin as described above, but this resin may be a blend of polyphenylene ether resin and polystyrene resin, or a phenylene ether homopolymer,
Alternatively, a polyphenylene ether polymer mainly having this structure is modified by grafting a part or all of polystyrene onto the polyphenylene ether polymer.

Examples of the polystyrene resin include modified polystyrene grafted with polybutadiene, EPDM, etc., and styrene-containing polymers such as styrene-acrylonitrile-containing polymers.

In addition, the content of polyphenylene ether in the polyphenylene ether resin is 15 polymerization parts or more.
The amount of polymerization is preferably 90 or less in order to maintain blow moldability and physical properties of the panel.

Furthermore, other plastics and elastomers may be blended with the polyphenylene ether resin as long as the properties of the polyphenylene ether resin are not impaired.

Plastic panel 1 configured as above
is made by blow molding a polyphenylene resin that has excellent heat resistance and high bending strength, compressive strength, and impact strength.Moreover, even if this resin material has poor heat welding properties, the heat bonding surface Since it has greatly improved bonding strength, it has high heat resistance and does not lose its rigidity even at high temperatures. Furthermore, since the joints forming the peripheral side of the plastic panel 1 are along the outer ridgeline, no deformation or bulges occur on the peripheral side of the plastic panel 1 due to joining, and the fitting into the equipment can be done smoothly. Moreover, the appearance of the plastic panel 1 is good.

Effects of the Invention As described above, the present invention involves separating a pair of plates made of polyphenylene resin so that a hollow space exists between them, and bending and forming the periphery of one plate in the direction of the periphery of the other plate. This is because the peripheral edge of one plate and the peripheral edge of the other plate are integrally connected by heat welding from the outer ridge line to the inner corner. , is blow molded using polyphenylene ether resin with excellent heat resistance, has extremely high joint strength at the pinch-off part, has excellent heat resistance, does not lose its rigidity even at high temperatures, and has bending strength, compressive strength, and impact strength. You can get excellent plastic panels,
It can be used as housing members for various devices, furniture members, automobile members, etc.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is an overall perspective view of a plastic panel, FIG. 2 is an enlarged sectional view of a portion thereof, FIG. 3 is a perspective view showing how the plastic panel is used, and FIG. 4 5 is a side view of the mold showing the blow molding mode, FIG. 5 is a cross-sectional view of the mold in a closed state, and FIG. 6 is a partially cutaway perspective view of the plastic panel removed from the mold. 1... Plastic panel, 1a, 1b... One and the other plate body, 1c... Circumferential side, 1d...
Outer ridgeline portion, 1e...inner corner, 1f...heat welded portion, 2...hollow portion, 3...rib, 5, 6...pair of molds, 5a, 6a...cavity, 7... ... Pinch-off part, 8 ... Extrusion head, 9 ... Parison, 10 ... Burr.

Claims (1)

[Scope of utility model registration request] A pair of plates made of polyphenylene ether resin are separated so that a hollow part is formed between them, and the peripheral edge of one plate is bent in the direction of the peripheral edge of the other plate to form a peripheral side. A plastic panel characterized in that the peripheral edge of one plate and the peripheral edge of the other plate are integrally connected by heat welding from the outer ridgeline to the inner corner.