JP2002070433A - Storage door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage door which brings about good working environment, is low in occurrence of fraction defective thereof when manufactured, is resistant to staining and easy to remove the stain, and long in service life. SOLUTION: The storage door consists of a front surface material 1 formed of a transparent resin sheet, a decorating layer formed on a rear side of the front surface material, and an external surface material 4 obtained by injecting a heat-melted thermoplastic resin onto the decorating layer of the front surface material, and then subjecting the same to compression molding while making contact with the thermoplastic resin sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage door for a system kitchen or a sink.

[0002]

2. Description of the Related Art In recent years, storage doors for system kitchens and the like have been designed to be easy to clean and have a so-called mirror-finished surface in order to improve cleanliness. That is, a laminate of a composite film in which a transparent film and a back film are laminated on the surface such as a plywood or a particle board is widely used. In addition, there has been a problem that dirt such as mold is attached, and a storage door that is difficult to be attached or that can be easily removed even if the stain is attached has been demanded.

[0003] Above all, when dust is attached to the surface of the molding die of the storage door, the dust penetrates directly into the surface of the molded body, causing not only the so-called mirror surface of the molded body but also the molding distortion. Had become. For this reason, the manufacturing operation is performed in a clean room, but the manufacturing process is complicated, which inevitably leads to an increase in cost.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, and has an excellent work environment, has a low occurrence of a defective rate during production, is hardly adhered with dirt, and is easy to remove. It is an object of the present invention to provide a storage door having a long service life.

[0005]

SUMMARY OF THE INVENTION The present invention provides a surface material comprising a transparent resin sheet, a decorative layer formed on the back side of the surface material, and a thermoplastic resin which is heated and melted on the decorative layer side of the surface material. And an external material that is compression-molded while being in contact with the surface material, and is usually one in which a decorative layer is printed on the surface material with a heat-resistant ink, and preferably the decorative material is The present invention relates to a storage door having a grid-like ridge formed on the periphery and on the surface, and more preferably, the surface material is a transparent resin sheet showing water repellency.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a transparent resin sheet is used as a surface material, and a decorative layer is added thereto to improve the appearance. For example, a printing layer is formed by gravure printing using a heat-resistant ink. This is also one of the preferred embodiments.

[0007] The transparent resin sheet to be the surface of the storage door is reinforced by injection and compression molding from the outside, and the adhesiveness between the transparent resin sheet and the transparent resin sheet is increased to improve the adhesion failure and the resin gap. It has the characteristics of excellent production efficiency at the time of molding, environmental friendliness by using thermoplastic resin, and low pressure molding method, so that molding distortion hardly occurs and there is little aging. It is a thing. In particular, in the case where a grid-like ridge is formed around and on the outer surface material, the strength of the storage door is added, or a portion to be attached to the unit frame material is formed.

[0008] From the viewpoint of the manufacturing process, since there is almost no manual manufacturing process of the operator and the molding operation is mainly performed in the mold, the working environment, safety and sanitation are excellent, and the heat on the surface material side is high. There is no poor adhesion or peeling between the thermoplastic resin sheet and the thermoplastic resin on the injection compression molded resin side (outer surface material side), and the production efficiency is excellent. Also, the bonding between the surface material and the outer surface material is ensured, and the difference in thermal expansion coefficient is small, so that the surface material plate is less likely to be distorted and deteriorated due to temperature change, so that the service life is extended. Things.

For the transparent resin sheet as a surface material used in the present invention, for example, acrylic resin, PET resin, AS resin, PVC resin, PP resin, PE resin, AB
A sheet selected from S resin and PS resin is used, and among them, an acrylic resin sheet or a PET resin sheet is preferably used.

The acrylic resin sheet is a material having a glossy and soft feeling, and is characterized by being resistant to dirt and scratching, has an advantage in terms of repair, and is an excellent surface material. . It is to be noted that it is possible to use the composition as it is with transparency, but it may be a composition containing a coloring agent such as a pigment or an inorganic mineral selected as necessary. It is also possible to improve the design by applying a pattern on the back side of the acrylic resin sheet with, for example, an acrylic paint.

The acrylic resin sheet is, for example, a cast sheet made of an acrylic resin of polymethyl methacrylate, which can be used without being crosslinked.
A partially crosslinked acrylic resin sheet is excellent in surface hardness and chemical resistance and has excellent properties at the time of molding, and is preferably used in the present invention. In addition, it is one of the preferable embodiments to form a printing layer on the surface of the acrylic resin sheet which comes into contact with the thermoplastic resin, for example, by gravure printing using a heat-resistant ink.

Further, a PET resin sheet is also preferably used as the surface material, which is obtained by condensation polymerization of dimethyl terephthalate and ethylene glycol, and has excellent mechanical strength and excellent abrasion resistance. It is. Of course, it goes without saying that the printing layer can be formed by, for example, gravure printing using a heat-resistant ink.

In the case where the protective sheet is laminated with an adhesive on the surface of the transparent resin sheet, the protective sheet protects the transparent resin sheet from dust and the like existing in the mold at the time of molding and has a mirror surface on the surface. This protects the condition and brings great advantages in manufacturing.

The protective sheet to be laminated on the transparent resin sheet is preferably a sheet that is more flexible than the transparent resin sheet, so that dust and the like in the mold are easily deformed and wrapped. Because. A typical protective sheet is a PE resin sheet,
In addition, PP, soft PVC, and the like are used. In addition,
This protective sheet is coated with an adhesive, and is provided for lamination with a transparent resin sheet.

The thickness of the transparent resin sheet constituting the surface material is appropriately selected, and includes a plate, a sheet, and a film. In the present invention, these are collectively referred to simply as a sheet. Called. Although the thickness of the surface material of the present invention is not particularly limited, it is about 2 μm to 20 mm, preferably 5 μm to 500 μm, and more preferably 10 μm to 250 μm.
μm is used. The transparent resin sheet as a surface material may be a flat sheet, but it is set in a vacuum forming machine (not shown) in advance, and this is heated and softened, and then shaped by vacuuming. May be used.

The means for decorating the surface material is not particularly limited, but the surface of the transparent resin sheet is decorated by, for example, gravure printing or silk printing. In the present invention, it is preferable that the outermost surface of the surface material made of a transparent resin sheet shows water repellency from the viewpoint of preventing adhesion of dirt and facilitating removal of dirt. As the water repellency, the contact angle of water is preferably 90 degrees or more. Means for imparting water repellency to the surface of the transparent resin sheet include transparent resin sheets.
Coating a silicone-based compound on the surface of the sheet, further laminating a water-repellent resin sheet containing the silicone-based compound, or applying a fluorine-based compound on the surface of the transparent resin sheet. Or a water-repellent resin sheet comprising or blended with a fluorine-based compound,
This is achieved by

In order to make the surface of the transparent resin sheet water-repellent, a silicone-based compound having a main chain of a polyorganosiloxane such as polydimethylsiloxane, polyphenylmethylsiloxane and polydiphenylsiloxane is used. Is used. As a method of applying a silicone-based compound to the surface of a transparent resin such as PET or acrylic resin, an emulsion or a solvent solution of a heat-condensed or heat-added silicone-based compound is applied by a bar coating method, Coating method, roll coating method, flow coating method, etc., and drying and crosslinking in a hot air oven, or an emulsion or solvent of a radiation- or ultraviolet-curing reactive polyorganosiloxane. The solution is applied by a bar coating method, a doctor blade method, a roll coating method, a flow coating method, or the like, and irradiated with radiation or ultraviolet rays to crosslink and cure the polyorganosiloxane. Examples of the thermal condensation type include those obtained by reacting silanol-functional dimethylpolysiloxane at both ends with methylhydrogenpolysiloxane or methylmethoxysiloxane in the presence of an organotin-based catalyst. Examples of the heat addition reaction type include those obtained by reacting methylvinylpolysiloxane having a vinyl group at both molecular terminals or both terminals and a side chain with methylhydrogenpolysiloxane in the presence of a platinum-based catalyst. The ultraviolet-curing type is obtained by adding a photopolymerizing agent to a polyorganosiloxane containing an alkenyl group and a mercapto group, a product obtained by adding a photopolymerizing agent to a polyorganosiloxane containing a (meth) acrylic group, and a polyorganosiloxane containing an epoxy group. Examples thereof include those obtained by adding an onium salt photoinitiator to an organosiloxane, and examples of the electron beam-curable type include a polyorganosiloxane containing a radical polymerizable group.

As a method of further laminating a water-repellent resin sheet in which a silicone-based compound is blended on the transparent resin surface of PET or acrylic resin, acrylic resin, PET resin, AS resin, PVC resin, PP resin , PE resin, AB
Polymerizable polyorganosiloxane having acryloyl group, methacryloyl group, vinyl group, mercapto group, etc. in one or both terminals or side chains in thermoplastic resin such as S resin, or polyfunctionality as necessary Water repellent film or acrylic silicone with added compound
Heat-bonding a film made of a silicone-based resin that exhibits water repellency by itself, such as a copolymer, or extruding through an adhesive or an adhesive film, a lamination method, a co-extrusion method, or a dry lamination method. Laminate with If necessary, immobilization is performed by irradiation with an electron beam or the like or irradiation with ultraviolet rays.

In order to make the surface of the transparent resin sheet water-repellent with a fluorine-based compound, the surface of the transparent resin sheet is treated with a fluorine compound such as fluoroalkyl acrylate or fluoroalkyl group-containing polyorganosiloxane. Or ethylene-tetrafluoroethylene copolymer, tetrafluoroethylene-perfluoroalkylvinyl ether copolymer, PTFE, FEP, PCTFE, ECTFE,
Extruding a water-repellent resin sheet made of a fluorine-based compound such as PVdF or PVF onto a transparent resin sheet through heat fusion, an adhesive or an adhesive film, a lamination method, a co-extrusion method, and a dry lamination method. Laminate with
If necessary, immobilization is performed by irradiation with an electron beam or the like or irradiation with ultraviolet rays.

The thermoplastic resin used for the injection compression is not particularly limited as long as it can be fused with the surface material. Representative examples of the thermoplastic resin include, for example, acrylic resin and PET resin. , AS resin,
It is selected from PVC resin, PP resin, PE resin, ABS resin, PS resin and the like. In addition, it is preferable that the resin is the same as the transparent resin sheet constituting the surface material, so that both can be thermally welded, and if different materials are used, an adhesive or the like may be interposed.

Above all, an ABS resin having excellent impact resistance and having high rigidity in a high temperature range is particularly preferable.
Needless to say, various additives can be added to such a thermoplastic resin, as well as antibacterial and antibacterial agents such as inorganic fillers such as glass fiber, talc and mica, flame retardants, coloring agents and silver complex antibacterial agents. Molding agents and foaming agents such as azodicarbonamine. When a foaming agent is blended, the thermoplastic resin layer (outer surface material) becomes porous and has excellent heat insulating properties. In addition, it is preferable to add glass fiber because the glass fiber has excellent rigidity. In this case, the glass fiber length and blending amount are arbitrarily selected, but usually 1 to 6 m
m and about 5 to 30% by weight.

Since such a thermoplastic resin is in a relatively large mold and undergoes an injection step and a compression step, the melt flow rate is an important factor, and the melt flow rate is 2 or more, preferably 5 or more, and furthermore Preferably, 15 or more are good.

The above-mentioned thermoplastic resin is heated and melted in advance, and the pressure at the time of compression after being injected into the mold depends on the fact that the projected area of the mold is large and that the surface material is damaged. In order to avoid this, it is preferable to perform compression molding at a pressure as low as possible, and it is about 50 to 150 kg / cm ² .

The thermoplastic resin that has been melted by heating is injected into the mold, and then (or at the same time) compression is started. The resin is compressed by the mold with the surface material set, In this way, the resin spreads to every corner of the mold and is brought into complete contact with the set surface material, where the two are integrated with a decorative layer interposed therebetween. The injection molding machine to be used may be either a vertical type or a horizontal type, but a type having a structure in which a vertical type, that is, a mold is relatively opened and closed in a vertical direction is preferably used.

Incidentally, in order to further enhance the bonding effect between the two,
Naturally, an adhesive is used as appropriate.
For example, there is a method of applying a two-component urethane-based adhesive, but the adhesive is appropriately selected depending on the properties of both resins.

Regarding the manufacturing method of the storage door of the present invention, a transparent resin sheet is used as a surface material, gravure printing is performed on the surface material, and then the transparent resin sheet is set in a mold of an injection compression molding machine. Injecting the thermoplastic resin that has been heated and melted, then compressing the injected thermoplastic resin with the surface material set, bonding the transparent resin sheet and the thermoplastic resin to form an outer surface material , Wherein the injection molding machine is a vertical type or a horizontal type.

Here, in the injection compression molding method, a molten resin is supplied through a gate into a cavity formed by a plurality of dies opposed to each other, and the molten resin is moved, filled, pressed, and cooled to form a molded product. Is a way to get Since the resin has a low shear stress at the time of filling and can be cooled with a substantially uniform pressure after filling, the resin has characteristics of small residual strain and small deformation. On the other hand, according to normal injection molding, the residual strain during molding is large because the shear rate of the resin is high,
Deformation after molding is greater.

[0028]

The present invention will be described in more detail below. FIG. 1 is a conceptual diagram of such a process, in which a PET resin sheet 1 showing water repellency only on one side (the surface of the final product) as a surface material 10.
Has a thickness of 100 μm. In order to make one side of a PET resin sheet water-repellent, a dimethylpolysiloxane having silanol groups at both ends and methylhydrogenpolysiloxane are reacted in the presence of an organotin-based catalyst.
The K solution was applied by a roll coating method and dried.

Next, the decorative layer 1a was formed by performing gravure printing using a heat-resistant ink on the surface (the surface to be laminated) on the surface not exhibiting water repellency, and then applying a urethane-based adhesive. Then, the adhesive layer side of the surface material 10 is set in the female mold 3 of the vertical injection compression molding machine with the adhesive layer side inside, and the molds 3 and 5 are closed. Resin (here, ABS resin) 4 is gated 6
Is injected into a mold surrounded by the surface material 1 and the fixed mold 5. That is, the ABS resin 4 heated and melted at 250 ° C. is injected into the mold. The resin used had a melt flow rate of 48.

After the ABS resin 4 is melt-injected into the mold, the ABS is applied to the female mold 3 with the surface material 10 set.
The resin 4 is compressed at 62.5 kg / cm ² , cooled and cooled, and the PET resin sheet 1 as the surface material 10 and the outer surface material 20 are compressed.
ABS resin 4 was integrated to obtain a storage door. The storage door has a grid-like ridge 21 (height 20 mm, width 3 mm) made of the ABS resin 4 around and on the outer surface material 20.
Is formed. FIG. 2 is a partially enlarged sectional view of the obtained storage door. In addition, the size was 450 mm in width, 600 mm in height, and the shape of the lattice was 50 mm × 50 mm. The contact angle of water on the surface of the water-repellent sheet was 110 degrees, showing sufficient water repellency, and the wiping property of the magic ink was good and the antifouling property was shown.

As for the transparent resin sheet, a protective sheet may be laminated on the transparent resin sheet.
It is obtained by laminating a PE resin sheet (100 μ) as a protective sheet on an ET resin sheet (100 μ). As the adhesive layer, for example, a hot melt adhesive is preferably used. And at the time of molding the side wall described above,
If dust or the like adheres to the surface of the mold, the PET resin sheet 1 directly contacts and is damaged if there is no ordinary protective sheet, but in the case of the above example, the PET resin sheet 1 A soft protective sheet laminated on the outside comes into contact with this, and a molded article is obtained in a state where dust is absorbed in the protective sheet. If the protective sheet is peeled off, a molded article with no scratch on the mirror surface (surface) is obtained. Becomes Therefore,
There is an advantage that it is not necessary to perform a manufacturing operation in a clean room. If the allowable size of dust is about 30% of the thickness of the protective sheet, the dust is absorbed by this protective sheet.

In terms of the molding method, it is preferable that the surface material is arranged so as to follow the flow of the resin, rather than being completely sandwiched between the male and female molds. It is preferable to provide a slight gap between the edges of the mold with a spacer having a predetermined thickness interposed between the edges of the surface material. The material of the spacer is not particularly limited as long as it can resist the force of the hydraulic clamp for closing the male and female molds, and the thickness and flexibility are arbitrarily selected.For example, if the thickness of the spacer becomes too large, This is because the movement becomes too slow, the role of the spacer is reduced, and the resin enters during the molding, so-called burrs are generated, which involves the work of cutting the burrs. In addition, if the thickness of the spacer is too thin, the movement of the surface material is restricted, and there is a disadvantage that wrinkles occur. Therefore, it is preferable to use a material which is slightly elastic and slightly thicker than the film (about 1 to 2 times). For example, a PE tape, a PP tape, an aluminum adhesive tape or the like is used in one or more layers. . Specifically, the thickness of the spacer is か ら of the thickness of the surface material to +1 m of the thickness of the skin material.
It has a thickness of about m, and it is preferable that the surface material can be moved by the resin pressure.

[0033]

According to the storage door of the present invention, since the transparent resin sheet is used as the surface material and the thermoplastic resin is integrated with the decoration layer interposed therebetween, the decoration layer is always visible through the surface material. It was something that looked good. Furthermore, the surface has antifouling properties, and the occurrence of defects in the production process is small, and the peeling of the film and the mounting screws caused by the poor dimensional stability of the wood as in the conventional case do not occur. It has an excellent feature.

[Brief description of the drawings]

FIG. 1 is a process diagram showing a method for manufacturing a storage door of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of the obtained storage door.

[Explanation of symbols]

 1 PET resin sheet (surface material), 1a decorative layer, 3 male mold of injection compression molding machine (moving mold), 4 thermoplastic resin (outer surface material), 5 injection compression molding machine Female side mold (fixed mold), 6 mm gate of injection compression molding machine, 10 mm surface material, 20 mm outer surface material, 21 mm ridge.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 3/00 C08K 3/00 C08L 101/00 C08L 101/00 // B29K 105: 20 B29K 105: 20 B29L 31:44 B29L 31:44 F term (reference) 2E016 HA06 HA10 JC07 LA01 LA10 LB05 LD00 4F006 AA12 AA15 AA16 AA22 AA35 AB39 AB63 BA11 CA00 DA04 4F072 AA08 AB09 AD04 AD05 AD06 AD09 AD37 AL17 4F206 AA04 AA21 AA13 AG03 AH51 JA03 JB13 JB19 4J002 AA011 BB031 BB121 BC031 BC061 BD041 BG001 BN151 CF061 DJ046 DJ056 DL006 FA046 FD016 GL00

Claims (16)

[Claims] 1. A surface material made of a transparent resin sheet, a decorative layer formed on the back side of the surface material, and a thermoplastic resin which is heated and melted on the decorative layer side of the surface material, and is injected into the surface. And an outer surface material that is compression molded while in contact with the material. 2. The storage door according to claim 1, wherein the decorative layer is printed on a surface material. 3. The storage door according to claim 1, wherein a grid-like ridge is formed around and on the outer surface material. 4. The transparent resin sheet is made of acrylic resin, PE
T resin, AS resin, PVC resin, PP resin, PE resin,
The storage door according to claim 1, wherein the storage door is a sheet selected from an ABS resin and a PS resin. 5. The resin according to claim 1, wherein the thermoplastic resin forming the outer surface material is a resin selected from an acrylic resin, a PET resin, an AS resin, a PVC resin, a PP resin, a PE resin, an ABS resin, and a PS resin. Storage door. 6. The storage door according to claim 1, wherein the thermoplastic resin forming the outer surface material has a melt flow rate of 2 or more. 7. The storage door according to claim 1, wherein the thermoplastic resin forming the outer surface material is colored and decorated with an inorganic filler. 8. The storage door according to claim 1, wherein the thermoplastic resin forming the outer surface material has a porous structure. 9. The storage door according to claim 1, wherein the thermoplastic resin forming the outer surface material is reinforced with glass fibers. 10. The storage door according to claim 1, wherein an adhesive layer is interposed between the transparent resin sheet and the thermoplastic resin. 11. The storage door according to claim 1, wherein the surface of the transparent resin sheet exhibits water repellency. 12. A water-repellent transparent resin sheet having a surface coated with a silicone-based compound or a transparent resin sheet containing a silicone-based compound further laminated. The storage door according to claim 11, which is: 13. A transparent resin sheet exhibiting water repellency, wherein a fluorine-based compound is applied on the surface or a transparent resin sheet containing a fluorine-based compound is further laminated. 12. The storage door according to 11. 14. The storage door according to claim 1, wherein a protective film is laminated on the transparent resin sheet with an adhesive. 15. The storage door according to claim 14, wherein the protective sheet is a resin softer than the transparent resin sheet. 16. The protection sheet according to claim 1, wherein the protection sheet is a PE resin.
The storage door according to 5.