JPH0994179A - Shutter type bathtub lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a band-shaped molded item for use as a bathtub lid in any desired length by simultaneously extruding hollow members made in copolymer resin of acrylonitrile-butadiene-stylene and band pieces made in a soft PVC series resin compound containing non-transition type plasticizer, and subjecting them to a fusion attachment with high frequency induction heating. SOLUTION: Thin and long hollow members 1 are formed from a copolymer resin of acrylonitrile-butadiene-styrene (ABS reain) and are provided internally with reinforcing ribs 2. To couple these hollow members 1 with one another, band pieces 3 made in a soft PVC series resin containing non-transition type plasticizer are formed by a simultaneous extrusive shaping process. Each hollow member 1 is at the end parts overlapped with band pieces 3 and these parts are put infusion attachment by means of high frequency induction heating, and repetition of this working cycle yield an intended lid for bathtub having any desired length. Adoption of such soft PVC series resin compound enables welding by this indication heating method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft strip-shaped member which is extruded at the same time as an elongated hollow member for covering the upper surface of a large bathtub to prevent the steam of the hot water in the bathtub from being diffused and the temperature of the hot water from decreasing. The present invention relates to a shutter-type bathtub lid which is formed into an arbitrary length by repeating welding of soft parts at the ends in the longitudinal direction of a strip-shaped molded product made of one piece.

[0002]

2. Description of the Related Art A conventional bathtub lid is manufactured by Shoko 61-1832.
As indicated by the Japanese Patent Publication, a combination of wooden thick boards as a lid of a bathtub has been used since ancient times, and a combination of polypropylene (PP) plow-molded boards, which is light and easy to handle, has been used. However, the shutter type bathtub lid made of synthetic resin has been more frequently used because of its convenience. This is because the elongated hollow rod-shaped body made of a synthetic resin and a large number of connecting strips made of a soft synthetic resin are connected to each other so that they can be rolled up, and the handling is easy. In the case of a shutter type bathtub lid made of polypropylene (PP) resin as a synthetic resin, a polyolefin elastomer is used as the soft material, but the welding property between the soft materials is high-frequency dielectric heating as if using the softness of polyvinyl chloride. Since the above method is extremely difficult, there is a drawback that an expensive ultrasonic welding machine or a heat welding machine with low productivity must be adopted.

[0003]

However, conventionally, an elongated hollow member molded from a hard polyvinyl chloride resin composition and a soft strip connected to the elongated hollow member are made of soft polyvinyl chloride containing a usual plasticizer. 4 resin composition
~ Simultaneous extrusion molding with six elongated hollow members, the soft strip-shaped pieces at the longitudinal ends of the strip-shaped molded article are overlapped and subjected to high-frequency dielectric heating, and the step of pressure-bonding and welding to repeat the steps is repeated. A shutter type bathtub lid molded into a length was manufactured, but it is made of a conventional hard PVC composition and a soft PVC composition in response to the recent trend toward larger bathtubs and an increase in 24-hour baths. Since the shutter-type bathtub lid is made of polyvinyl chloride and has a large specific gravity (hard specific gravity 1.4 to 1.5, soft 1.3 to 1.4), it is heavy and inconvenient to handle, and is soft. Polyvinyl chloride (3) uses a phthalic acid-based plasticizer, and therefore has a problem that it is liable to volatilize and deteriorate. In order to solve these problems, the elongated hollow member is made of PP resin and PP resin, and the connecting strip is a soft elastomer of PP copolymer of ethylene / propylene / diene / methylene (EPDM). , Hydrogenated styrene, butadiene rubber, or styrene-ethylene-butylene-styrene (SEB
A method has been proposed in which a resin composition obtained by blending the copolymer of S) is coextruded and then the soft part is welded (Japanese Utility Model Publication No. 7-5487, JP-A No. 7-111953,
No. 7-7583), all of these soft materials are extremely difficult to weld by high frequency dielectric heating like soft polyvinyl chloride, therefore conventional equipment cannot be used, and hot air welding, hot plate welding, Although sonic heating welding is required, there is still a drawback that the welding is insufficient as compared with high-frequency dielectric heating of soft polyvinyl chloride and the apparatus is expensive.

In view of these circumstances, the present invention is an elongated hollow member made of ABS resin having a low specific gravity (specific gravity 1.05) and ABS resin (specific gravity 0.9 to 0.7) obtained by low foaming the ABS resin. And a non-migrating soft polyvinyl chloride resin composition that connects the elongated hollow members together are co-extruded to form a strip-shaped molded product, and the longitudinal ends of the strip-shaped molded product are overlapped to form a high-frequency dielectric. The object of the present invention is to provide a shutter-type bathtub lid which is formed into an arbitrary length, is lightweight, is easy to handle, and does not easily deteriorate even when used in a bath for a long time, by repeating the steps of heating, pressurizing, and welding after heating. is there.

[0005]

In order to solve the above-mentioned problems, the present invention employs the following technical means. In the invention according to claim 1, the elongated hollow member made of acrylonitrile / butadiene / styrene copolymer resin and a strip made of a soft polyvinyl chloride resin composition containing a non-migrating plasticizer are simultaneously extruded, In order to connect the elongated hollow members to each other, the strip-shaped molded article in which the strips are welded is formed at both ends in the longitudinal direction of the elongated hollow members, and the strips at the ends are overlapped with each other by high-frequency dielectric heating. By adopting a technical means characterized in that a shutter-type bathtub lid is formed to have an arbitrary length on the strip-shaped molded article by repeatedly performing the welding.

According to a second aspect of the present invention, in the first aspect of the present invention, when the ABS is blended with a foaming agent to extrude and foam, the elongated hollow member can be made lighter, and at the same time, the heat conduction is higher than that in the case of no foaming. The rate was lowered (non-foamed product 0.10 → low-foamed product 0.072 Kcal / mh ° C.) and the heat insulating effect was improved, so a technical means was adopted to further prevent the tendency of lowering the hot water temperature.

According to a third aspect of the present invention, in the first aspect of the invention, there is provided a technical means of using a trimellitic acid ester as a plasticizer in a soft polyvinyl chloride resin composition containing a non-migrating plasticizer. Adopted. The invention according to claim 4 is the same as the invention according to claim 3, wherein a technical means of further blending the ethylene / vinyl acetate copolymer (EVA) in a proportion of 10% to 50% is adopted.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention uses an elongated hollow member made of ABS.
By making the ABS resin low foaming by using a resin, it is possible to reduce the weight by 25% to 30% as compared with the case of using a hard polyvinyl chloride resin, and the soft strips connecting these are made non-woven. Since it is a soft polyvinyl chloride system that contains a migrating plasticizer, the high frequency dielectric heating that was used conventionally can be used as it is, and there is no problem of the welding surface and it can be produced with high productivity, so it is possible to reduce the cost of expensive equipment. No need to renew, economic effect is good. And these problems could be solved only by changing the die for extrusion and the raw material.

[0009]

An embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a band-shaped molded product including the elongated hollow member of the present invention and a band-shaped piece. FIG. 2 is a cross-sectional view showing an embodiment in which strip-shaped pieces in the longitudinal direction at the ends of the strip-shaped molded product are welded and connected by high frequency dielectric heating. Reference numeral 1 is an elongated hollow member made of ABS resin or foamed ABS resin. Inside the elongated hollow member 1, rib pieces 2 for reinforcement for connecting upper and lower parts are attached. Reference numeral 3 denotes a coextruded strip-shaped piece made of a soft polyvinyl chloride resin composition containing a non-migrating plasticizer for connecting the elongated hollow members, and the strip-shaped pieces 3 are provided at both ends of the elongated hollow member. A few (usually about 4 to 6) elongated hollow members 1 made of integrally extruded ABS resin, and a soft material containing a non-migrating plasticizer coextruded at both ends of the elongated hollow member 1. It is possible to repeat the process of stacking strip-shaped pieces 3 made of a polyvinyl chloride resin composition, heating and pressurizing by high frequency dielectric heating, and welding to form an arbitrary length.

The ABS resin used as the material for producing the elongated hollow member 1 is a commercially available ABS resin for extrusion, and M1 is 3 to 3.
Although about 8 is used, when foaming, a mixture of 0.2 to 0.5 parts of azodicarbonamide as a foaming agent is used. The strip 3 for connecting the elongated hollow members is an octyl trimellitate (T) among the plasticizers having excellent non-migrating property in the polyvinyl chloride resin composition containing the soft non-migrating plasticizer. OTM) and other trimellitic acid ester plasticizers have been found to have excellent compatibility with ABS resins. Further, it has been found that ethylene / vinyl acetate copolymer (EVA) is added thereto to harden it at a low temperature, thereby reducing the tendency that the rolling of the shutter becomes difficult. Other polyesters as non-migratory plasticizers, such as polypropylene adipate (PPA), etc.
When the weldability during coextrusion with the BS resin was examined, it was found that the trimellitic acid ester plasticizer was excellent. Other polyesters are also available, but they have poor compatibility with ABS resins.

The phthalic acid type plasticizer is not preferable because it has a migration property and may cause cracks in the ABS resin. This non-migratory PVC compound is capable of high-frequency dielectric heating similar to ordinary soft polyvinyl chloride-based compositions, has excellent non-migratory properties, and has almost no volatility. It is possible to provide an excellent shutter-type bathtub lid, which is less prone to deterioration, has almost no deterioration in the soft portion, is lightweight and easy to handle.

[0012]

According to the present invention, the following effects can be obtained based on the above configuration. (1) Since the strip is made of a soft polyvinyl chloride resin composition containing a non-migrating plasticizer, it is light in weight, easy to handle, and high frequency dielectric heating can be used for bonding.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a shutter-type bathtub lid which is an embodiment of the present invention.

[Explanation of symbols]

 1 ... ・ Slender hollow member 3 ・ ・ ・ ・ Soft strip 2 ・ ・ ・ ・ Rib pieces for reinforcement

Claims (4)

[Claims] 1. An elongated hollow member made of an acrylonitrile / butadiene / styrene copolymer resin and a strip made of a soft polyvinyl chloride resin composition containing a non-migrating plasticizer are simultaneously extruded to obtain the elongated hollow member. In order to connect the strip-shaped members to each other in the longitudinal direction of the elongated hollow member, a strip-shaped molded product obtained by welding the strip-shaped pieces is formed, and the strip-shaped pieces at the ends are overlapped to weld the strip-shaped pieces to each other by high-frequency dielectric heating. A shutter-type bathtub lid characterized in that a strip-shaped molded product is formed into an arbitrary length by repeating the process. 2. The shutter type bathtub lid according to claim 1, wherein the elongated hollow member is made of a low foam acrylonitrile / butadiene / styrene copolymer resin. 3. The shutter type of claim 1, wherein in the soft polyvinyl chloride resin composition containing a non-migrating plasticizer, trimellitic acid ester is used as the plasticizer. Bathtub lid. 4. The shutter type bathtub lid according to claim 3, further comprising an ethylene / vinyl acetate copolymer blended therein.