JPS6243787Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a pressure receiving panel, and in particular, a protective layer is provided on the surface of at least one face plate on both the upper and lower sides of a sanderch panel whose core material is a honeycomb core, and the weight is reduced. It improves the hardness and abrasion resistance of the surface, as well as the mold releasability against deposits on the surface.

Generally, a heat insulating panel filled with a urethane foam material is used for the outer box of a refrigerator, freezer case, etc. This insulation panel is made by holding two surface plates such as iron plates or synthetic resin plates at a predetermined distance, injecting liquid urethane foam material between them, and then heating and foaming the material.
Although the face plates on both sides are manufactured as one unit, the foaming pressure during heating and foaming is approximately 0.2 to 0.5 kg/cm ² , so it is necessary to prevent the face plate of the insulation panel from deforming due to this foaming pressure. To prevent this, a presser plate is placed in contact with the outside of the heat insulating panel to support the load.

Conventionally, phenolic resin laminates (Bakelite plates), aluminum veneers, etc. have been used as this type of holding plate, but the load that the insulation panel receives due to the foaming pressure of the urethane foam material is, for example, the area of the insulation panel. If it is ^1m2 , the maximum weight is 5 tons, so in order to support this load, the thickness of the presser plate must be increased, and Bakelite plate is 20mm thick.
The thickness of aluminum veneer is approximately 15 mm. However, if the thickness of the board is increased in this way, the weight of the Bakelite board will be 26 kg/
m ² , 41Kg/m ² for aluminum veneer, and the weight of the presser plate is heavy, so when attaching the presser plate and removing it from the insulation panel after foaming is completed, it would be hard work if done manually, but it is necessary to attach and remove it using mechanical equipment. In any case, not only does it take a long time to operate, reducing work efficiency, but in both cases, the entire device becomes large, which increases equipment costs and expenses.

In addition, Bakelite plates are prone to delamination due to heating during use and lack durability, while aluminum veneers have excellent durability but are soft, so they cannot be easily handled during handling. The disadvantage is that the surface that comes in contact with the insulation panel is prone to scratches and bruises and wears out during use, and these scratches and worn parts scratch the surface of the insulation panel, impairing the product's value. Furthermore, if the urethane foam material leaks from the cross-sectional panel during foaming and adheres to the surface of the presser plate, it is difficult to remove it, especially from aluminum veneers, as they have poor mold releasability. However, there is a disadvantage that there is a risk of damaging the surface and the same result as described above occurs.

This invention was made to eliminate the above-mentioned drawbacks, and the purpose of this invention is to provide a pressure receiving panel that is lightweight and has high bending rigidity. The object of the present invention is to provide a pressure receiving panel that has high surface hardness, excellent wear resistance, and excellent mold releasability from deposits.

That is, in this invention, as in the illustrated embodiment, a honeycomb core 10 is used as a core material, and an upper plate 12 and a lower plate 14 are bonded to the upper and lower edges of the core, respectively, and at least one of the upper and lower double-sided plates 12 and 14 is bonded. The present invention relates to a pressure-receiving panel having a protective layer 16 provided on its surface with high hardness, abrasion resistance, and excellent releasability from deposits.

Examples of this invention will be described below with reference to the drawings.

FIG. 1 is a side view showing an embodiment of the pressure receiving panel of this invention, and FIG. 2 is a plan view thereof.

In the figure, reference numeral 10 denotes a honeycomb core, which is formed by bonding the sides of a hexagonal column made of a thin plate of aluminum or fiber-reinforced synthetic resin to form a honeycomb shape. The density of the material of this honeycomb core 10 is preferably about 0.03 to 0.1 g/cm ³ .

An upper plate 12 is attached to the upper edge of the honeycomb core 10, and a lower plate 14 is attached to the lower edge of the honeycomb core 10 using adhesives 13 and 15, respectively.
It forms a panel with a sanderch structure using the core material.

The upper surface plate 12 and the lower surface plate 14 are molded from a metal plate or a fiber-reinforced synthetic resin plate, etc.
The thickness of the top plate 12 is about 0.5 to 1.6 mm, and the thickness of the bottom plate 14 is about 0.5 to 1.6 mm.
The thickness of the honeycomb core 10 is preferably about 0.5 to 2 mm, and the overall thickness of the sanderch panel can be determined by appropriately selecting the thickness of the honeycomb core 10 depending on the purpose of use. do.

The upper surface plate 12 and the lower surface plate 14 are connected to the honeycomb core 10.
It is preferable to use a heat-resistant epoxy adhesive (for example, CYBOND 3500 registered trademark) as the adhesives 13 and 15 to be adhered to.

A protective layer 16 is provided on the surface of the top plate 12. This protective layer 16 is formed of a synthetic resin or hard alumite film. As the synthetic resin film, melamine resin, polyester resin, fluororesin, etc. are preferable, and these resins are attached by coating treatment. When coating melamine resin and polyester resin, the thickness should be 0.3 to 0.4 mm and the surface hardness should be
It is preferable to have a Clemens type hardness of 70g or more as specified in JISK6902 and to apply a polishing process.In the case of fluororesin, it is preferable to apply a coating to a thickness of 10 to 50 microns and apply a polishing process. preferable. In addition to coating these synthetic resin films, a thin synthetic resin plate with a surface hardness equivalent to that described above and a glossy surface, or paper impregnated with these synthetic resins, may be attached to the top plate 12. , or may be attached by pressing. These synthetic resin films may be attached to the top plate 12 in advance and then bonded to the honeycomb core 10, or the synthetic resin film may be attached after the top plate 12 is bonded to the honeycomb core 10.

The hard alumite film is formed by previously oxidizing the surface of the top plate 12 when the top plate 12 is made of an aluminum plate. In this case, the thickness of the film is preferably 30 microns or more, and the surface hardness is preferably 300 or more on the Vickers hardness scale.

In the above embodiment, the protective layer 16 is provided only on the surface of the upper plate 12, but the protective layer 16 may be provided on both the surfaces of the upper plate 12 and the lower plate 14.

Reference numeral 18 in FIG. 2 is a bolt hole for attaching a reinforcing member.

The pressure-receiving panel with the above structure is made of a sandwich panel by gluing thin and light top and bottom plates to a honeycomb core with a low density, so it is extremely lightweight (about 7 kg/ ^m2 ). Regardless, since the mechanical strength of the honeycomb core is extremely high, the bending rigidity against pressing load is extremely high.

FIGS. 3 and 4 are exploded views of the pressure receiving panel 20 of this invention assembled into a box that can be opened and closed as a holding plate for manufacturing a heat insulating panel containing urethane foam for a refrigerator. A protective layer (not shown) is provided on the inner face plate 22 of each pressure receiving panel 20, and a reinforcing member 26 made of a rectangular pipe is attached to the outer edge of the outer face plate 24 with bolts 28.

A heat insulating panel for a refrigerator is housed in this box and sealed, and the urethane foam material injected between the front plates on both sides of the heat insulating panel is heated and foamed.

The load that the insulation panel receives when the urethane foam material is foamed acts on each panel of the box, but since each panel is composed of a pressure-receiving panel with high bending rigidity, the surface plate of the insulation panel There is no deformation or bending, and the box body is assembled with lightweight pressure-receiving panels.
The labor and time required for closing and opening the box when housing the heat insulation panel and when taking it out after foaming is completed is reduced, and work efficiency is greatly improved.

Furthermore, since the box opening/closing operation device is made smaller as a whole, equipment costs and expenses are also reduced. Furthermore, a protective layer with high hardness and excellent abrasion resistance is provided on the inner surface of each face material of the box body, so it will not suffer damage such as scratches or bruises during handling, and can be used repeatedly. Even if it comes into contact with the panel's surface plate, it will not wear out, and it is possible to prevent the occurrence of scratches and the like that would impair the product value of the heat insulating panel. Furthermore, since this protective layer is made of a material with a smooth surface and excellent releasability from deposits, even if the urethane foam material leaks and adheres, it can be easily removed. Even if it is removed using a scraper, there is no risk of scratches because the surface hardness is high and the mold releasability is excellent.

In the above example, the case where the pressure receiving panel of this invention was applied as a heat insulating panel of a refrigerator was explained, but the pressure receiving panel of this invention can also be used as a table for a screen printing machine or a table for a phototypesetting machine. You can also. These tables are subjected to repeated pressing loads, and chemicals such as ink adhere to the surface during operation. However, by constructing the table using the pressure-receiving panel of this invention, the table can be made lighter, scratch resistant, and more durable. It has improved abrasion resistance and has excellent releasability for deposits such as ink, so it can be easily removed.

As is clear from the above explanation, this invention provides high hardness, abrasion resistance, and mold releasability from deposits on at least one surface of the upper and lower surfaces of the sanderch panel, which uses a honeycomb core as the core material. Because it has a structure that provides an excellent protective layer, this invention not only provides a pressure-receiving panel that is lightweight and has high bending rigidity, but also has surface hardness and abrasion resistance that prevent it from being damaged. The pressure-receiving panel does not wear out or wear out, has excellent mold releasability against deposits, has improved durability, and has the effect of providing a pressure-receiving panel that can withstand long-term use.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of this invention, Fig. 2 is a plan view thereof, Fig. 3 is a perspective view of this invention applied to a presser plate for a heat insulating panel of a refrigerator, and Fig. 4 is a side view showing an embodiment of this invention.
The figure is an end view of the presser plate of FIG. 3. In the figure, 10 is a honeycomb core, 12 is a top plate, 1
4 is a bottom plate, and 16 is a protective layer.

Claims (1)

[Claims for Utility Model Registration] (1) A honeycomb core is used as a core material, and an upper plate and a lower plate are adhered to the upper and lower edges of the core, respectively, and at least one surface of the upper and lower double-sided plates has high hardness and wear resistance. and a pressure-receiving panel provided with a protective layer that has excellent mold releasability from deposits. (2) The pressure receiving panel according to claim 1, wherein the honeycomb core and the upper and lower surfaces are made of aluminum, and the protective layer is a hard alumite film with a thickness of 30 microns or more and a Vickers hardness of 300 or more. (3) The honeycomb core and the upper and lower surfaces are made of aluminum or fiber-reinforced synthetic resin, and the protective layer is a melamine resin film or a polyester resin film with a thickness of 0.3 to 0.4 mm, or a 10 to 50 mm thick protective layer.
The pressure-receiving panel according to claim 1, which is a fluororesin film with a thickness of microns and has a Clemens type tensile hardness of 70 g or more.