JP2935177B2 - Method of manufacturing shutter type bathtub lid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bathtub cover which is placed on the upper surface of a large bathtub to prevent the steam in the bathtub from dissipating and the temperature of the hot water from dropping. Of the elongated hollow member formed by extrusion molding and the longitudinal side portions of the strip formed by extruding a soft synthetic resin made of ethylene vinyl or alcohol copolymer resin are repeatedly welded to each other to form an arbitrary length. The present invention relates to a method for manufacturing a shutter type bathtub lid.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional manufacturing method. An elongated hollow rod-shaped member made of a hard synthetic resin and connecting strips made of a soft synthetic resin are provided on both sides in the longitudinal direction in the same mold a. And then extruded out of the mold by heat fusion, introduced into vacuum sizing b, molded under vacuum, solidified in cooling tank c, taken up by take-off machine d, cut by cutter e A method of manufacturing a strip-shaped molded product having a predetermined shape has been adopted. For example, Japanese Utility Model Laid-Open Publication No.
No. 11,1953.

[0003]

However, this method extrudes a soft synthetic resin molded at a relatively low temperature into a mold of a relatively high temperature for molding a hard synthetic resin. In this case, it becomes too soft and stretches when it is introduced into the mold.It is difficult to obtain the specified width.Therefore, the extrusion speed of the hard synthetic resin must be reduced, and adjustment must be performed. Was.

Further, in the conventional manufacturing process, since the hard and soft synthetic resins are joined and kept cooled, the distribution of heat in the product is not uniform, so that the product may be warped or distorted. As a countermeasure, molded products are generally 60 to 1
Dimensional stability has been maintained by leaving the shape in a room at a temperature of 00 ° C. and allowing it to cool, that is, annealing, but this method has a problem that it takes time and effort.

[0005] In view of these circumstances, the present invention separates and extrudes a hard synthetic resin and a soft synthetic resin having different melting temperatures and then integrally molds them, so that productivity is not reduced and warpage is not caused during use. It is an object of the present invention to provide a method for manufacturing a shutter-type bathtub lid made of a synthetic resin without distortion.

[0006]

In order to solve the above-mentioned problems, the present invention employs the following technical means. The invention according to claim 1 is a shutter type bathtub lid comprising a hard synthetic resin elongated hollow rod-shaped member and a connecting strip made of a soft synthetic resin for connecting these members. A technical means was adopted in which the strip was fused and then cooled, and then passed through a constant temperature chamber or a constant temperature water bath to form the strip.

A second aspect of the present invention is a method of manufacturing a shutter-type bathtub lid comprising an elongated hollow rod-shaped member made of a hard synthetic resin and a connecting strip made of a soft synthetic resin for connecting these members. First synthetic resin elongated hollow rod-shaped member
After extruding with a mold and forming by vacuum sizing, a strip of soft synthetic resin is extruded with a second mold on the same line, and then fused so as to connect the longitudinal both sides of a plurality of elongated hollow members. A technical means of forming a band through a cooling bath and then through a thermostatic chamber or a thermostatic water bath was employed.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is intended to stabilize the heat distribution of the entire product by fusing an elongated hollow rod-shaped member and a connecting strip to cool and then passing the same through a constant temperature room or a constant temperature water bath. Solved the problem of deformation at the time. As a result of adopting the technical means of forming the elongated hollow rod-shaped member of the hard synthetic resin and the strip of the soft synthetic resin by extruding and fusing, cooling, and then forming the strip through a constant temperature chamber or a constant temperature water bath, The problems of lowering the molding speed and causing uneven molding of the product have been solved.

[0009]

FIG. 1 is a schematic view showing one embodiment of the manufacturing process of the present invention. Reference numeral 1 denotes a first die for extruding an elongated hollow rod-shaped member made of a hard synthetic resin, and reference numeral 2 denotes a vacuum sizing. 3
Is a second mold for extruding a strip of soft synthetic resin, which is fused simultaneously with the extrusion so as to be connected to both longitudinal sides of the elongated hollow rod-shaped member. 4 is a cooling tank, 5 is a constant temperature water tank or a constant temperature chamber, 6 is a take-off machine, and 7 is a cutter.

Referring to FIG. 1 in more detail, an elongated hollow rod-shaped member made of a hard synthetic resin is not extruded simultaneously with a connecting strip of a soft synthetic resin in the same mold.
Only the elongated hollow rod-shaped member made of the hard synthetic resin is extruded from the first mold 1 and the shape is stabilized by vacuum sizing 2. Then, the connecting strip made of only the soft synthetic resin is extruded from the second mold 3 and fused. By squeezing, it is possible to fuse the flexible connecting strip to both ends of the hard elongated hollow rod-shaped member,
Even if a large number of hard elongated hollow rod members are extruded, even if the take-up speed is increased, the temperature of the soft connecting strip does not depend on the temperature of the first mold of the hard elongated hollow rod members, and may be excessively extended. It has been found that molding can be performed with good productivity without narrowing the width. At this time, the temperature of the hard elongated hollow rod-shaped member molded by the first mold is heated by passing through the second mold 3 to a temperature suitable for fusion with the soft connecting strip. Next, the strip obtained by fusing the hard elongated hollow rod-shaped member and the soft connecting strip is cooled in a cooling bath after leaving the second mold 3, and then cooled to a constant temperature chamber or a constant temperature water bath 5 at 70 to 90 ° C. Once introduced, once the whole is made the same temperature, the material is homogenized.

As described above, the first method for extruding a hard synthetic resin is as follows.
Since the mold 1 and the second mold 3 for extruding the soft synthetic resin are employed, and the hard and soft are molded by separate molds, temperature control can be performed very reliably and easily. In addition, once cooled by a cooler, introduced into a constant temperature chamber or constant temperature water tank, the whole is maintained at the same temperature, and both hard and soft materials are homogenized to eliminate warpage and distortion during use. It is.

[0012]

According to the present invention, the following effects can be obtained based on the above configuration. (1) Since the hard synthetic resin and the soft synthetic resin are separately extruded, it is easy to control the melting temperature suitable for each, and it is possible to mold without reducing the speed. (2) After fusing the hard synthetic resin and the soft synthetic resin, the material is homogenized in a short time by passing through a thermostatic water bath.
A product without warping or distortion can be obtained after molding.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one embodiment of a manufacturing process of the present invention.

FIG. 2 is a schematic view showing a conventional manufacturing process.

[Explanation of symbols]

1 ··· First mold 2 ··· Vacuum sizing 3 ··· Second mold 4 ··· Cooling tank 5 ··· Constant temperature water tank 6 ··· Take-up machine 7 ··· ·cutter

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-111953 (JP, A) JP-A 7-7583 (JP, U) JP-A 60-163091 (JP, U) (58) Investigation Field (Int.Cl. ⁶ , DB name) B29C 47/00-47/96 A47K 3/00 B29D 31/00

Claims (2)

(57) [Claims] 1. An elongated hollow rod-shaped member made of a hard synthetic resin,
In a method of manufacturing a shutter type bathtub lid comprising a connecting strip made of a soft synthetic resin for connecting these components, the elongated hollow rod-shaped member and the connecting strip are fused and then cooled, and then cooled in a constant temperature chamber or A method for manufacturing a shutter-type bathtub lid, wherein the belt-like body is molded by passing through a thermostatic water bath. 2. An elongated hollow rod-shaped member made of a hard synthetic resin,
In a method of manufacturing a shutter type bathtub lid comprising a connecting strip made of a soft synthetic resin for connecting these members, an elongated hollow rod-shaped member made of a hard synthetic resin is extruded with a first mold and molded by vacuum sizing. A strip of a soft synthetic resin is extruded with a second mold on the same line, and is fused so as to connect both longitudinal sides of a plurality of elongated hollow members, and then passed through a cooling bath, followed by a constant temperature chamber or constant temperature. A method for producing a shutter-type bathtub lid, comprising forming a belt-like body through a water tank.