JPS5950492B2 - Method for manufacturing a synthetic resin laminated sheet with a lace-like transparent pattern - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a synthetic resin laminated sheet having a lace-like transparent pattern.

In this specification, the term sheet includes both sheets and films.

This applicant has previously proposed an apparatus for producing synthetic resin sheets having a lace-like transparent pattern, and has already received a patent for this (see Patent No. 894910). The synthetic resin sheet with a transparent pattern produced by the apparatus according to the earlier patent is very similar to lace, and has a large number of through holes, and the part without holes, that is, the continuous part of the sheet. Also, a large number of uneven parts are formed. Therefore, if a sheet with such a transparent pattern is placed on a table and used, dust will enter its many recesses, and this will be difficult to remove by simply wiping with a cloth. Like other lace fabrics, there was a problem that it easily got dirty. In addition, a sheet with a transparent pattern has a large number of holes, and the continuous part of the sheet is formed to be relatively thin. Therefore, when the sheet is pulled with a rather strong force, the continuous part of the sheet There was a problem that the transparent patterned sheets could not withstand long-term use because they were easily cut. This invention was made to solve the above problem, and by bonding a flat transparent sheet to the surface of a synthetic resin sheet having a lace-like transparent pattern, it is possible to create a transparent sheet with a transparent pattern. It is hard to get dirty, and even if it gets dirty, it can be easily wiped off. Furthermore, it has a lace-like transparent pattern that will not break even if it is pulled with some force and can withstand long-term use. The object of the present invention is to provide a method for manufacturing a synthetic resin laminated sheet having the following properties.

This invention will be explained below based on the drawings.

1 to 3 illustrating apparatus for carrying out the method of the invention.
In the figure, reference numeral 1 denotes a vacuum forming apparatus equipped with a hollow rotating drum 2. A mold stand 3 is provided on the peripheral wall surface of the drum 2, and a mold 4 made of lace material is attached to the surface of the mold stand 3. A is a long moldable sheet made of thermoplastic resin such as EVA (ethylene-vinyl acetate copolymer) resin, and has a thickness of, for example, about 0.15 to 0.2 mm. 6 is a heating device that heats the forming sheet A to a forming temperature of 170 to 190°C; 7 is a first guide roll that guides the heated sheet A to the surface of the rotating drum 2; this is wrapped with a heat-retaining cloth or the like; It's dark.

When the softened sheet A heated to the forming temperature comes into contact with the surface of the lace fabric mold 4 of the vacuum forming apparatus 1, the suction force generated by the reduced pressure creates convexities corresponding to the numerous through holes 5 of the lace fabric mold 4. Portion b is formed so as to protrude from the back side of sheet A, and molded sheet B is produced. 8 is an auxiliary heater placed near the surface of the drum 2 following the first guide roll 7;
This is molded sheet B. It is for heating to 160-170°C and keeping warm.

C is a transparent sheet bonded to the surface of the molded sheet B, which is made of the same thermoplastic resin as the molded sheet A, such as EVA, and has a thickness of, for example, 0.1 to 0.2 mm. Note that this sheet C. As long as it is transparent, it may be colored. 9 is a second guide roll for guiding this transparent sheet C; 10 is a heater disposed following this guide roll 9;
It is heated to a softening temperature of 180°C.

Reference numeral 11 denotes a pair of pressure rolls, which are heated to about 150°C and are exposed near the surface of the drum 2 following the auxiliary heater 8. It is pressed onto the surface of the molded sheet B to form a laminated sheet D.

12 is a water-cooled cooling device disposed next to the crimp ring 11 near the surface of the drum 2, 13, 14,
Reference numeral 15 denotes third to fifth guide rolls, which are used to guide the cooled laminated sheet D to the cutting device 16.

The cutting device 16 includes an upper roll 17 and an upper roll 17 . a pair of lower openings 18, 19 arranged at a predetermined interval;
Near the front of these rolls 17, 18, 19, a cutter 20 is provided which faces the laminated sheet D in a direction opposite to the traveling direction of the laminated sheet D.
A large number of convex portions b protruding from the back side of the laminated sheet D due to
It is used to cut and remove. Further, as shown in detail in FIG. 2, the vacuum forming apparatus 1 has a hollow rotating drum 2 with a large number of suction holes 21 in its circumferential wall, and a large number of radial partition walls 22 inside the drum 2. It is divided into a required number of independent suction chambers 23.

A split-cylindrical mold stand 3 having a large number of suction holes 25 is provided on the surface of the peripheral wall of the drum 2 via a ventilation member 24.
The lace fabric mold 4 is placed on the surface of the mold base 3 via a ventilation member 26. The drum 2 is rotatably supported by a shaft 27, and is rotated counterclockwise in FIG. 1 by the operation of a drive device (not shown). Of the entire circumference of the drum 2, the period from when the forming sheet A begins to come into contact with the lace fabric mold 4 until before it is peeled off is defined as a suction section A, and the rest is defined as a non-suction section opening. In the above, the white molding sheet A made of EVA, for example, is heated to the molding temperature by the heater 6.

The sheet A softened by this is guided to the surface of the lace fabric mold 4 of the vacuum forming apparatus 1 by the first guide roll 7. When this softened sheet A came into contact with the mold 4, the convex portions b corresponding to the numerous through holes 5 of the lace fabric mold 4 protruded from the back side of the sheet A due to the suction force due to the reduced pressure from within the drum 2. The molded sheet B is produced. This formed sheet B is then heated by an auxiliary heater 8. on the other hand,
The transparent sheet C is guided from the second guide roll 9 to the heater 10 and heated to its softening temperature, and the heated transparent sheet C is hung and pressed onto the surface of the molded sheet B by a pair of pressure rolls 11 to form a laminated layer. A sheet D is formed. Next, this laminated sheet D is cooled by the cooling device 12, and the forming of this laminated sheet D is completed. At this time, a large number of convex portions b are formed on the back side of the laminated sheet D in a state in which air is sealed therein.
This laminated sheet D is then passed through three guide rolls 13 and 14.
, 15 to a cutting device 16 where the cutter 1 2
0, the laminated sheet D is cut and removed by removing a large number of protrusions b protruding from the back side thereof. As a result, as shown in FIGS. 4 and 5, the molded sheet B on the back side, in which the through holes 28 corresponding to the many through holes 5 of the lace fabric mold 4 are formed, is joined to the surface thereof. A laminated sheet E having a lace-like transparent pattern made of a transparent sheet C and a transparent sheet C is manufactured. In addition, in the above embodiment, two sheets A and C
However, if the molding sheet A has poor printability, for example, a three-layer molded sheet with a transparent pattern may be created using an intermediate sheet made of synthetic resin with good printability. can.

In the case of this modification, as shown by the two-dot chain line in FIG. After crimping and integrating the two, the following operations may be carried out in the same manner as in the above embodiment. As a result, as shown in FIG. 6, for example, the white molding sheet A, the printed intermediate sheet F, and the transparent sheet C have a lace-like transparent pattern in which they are crimped and integrated, and a desired pattern is formed in the middle. It is possible to produce a three-layer laminate sheet G having the following printing. In addition to the above-mentioned EVA, the materials for the molding sheet A, the transparent sheet C, and the intermediate sheet F are EVA-C (ethylene monoacetate vinyl monochloride terpolymer) and PVC (vinyl chloride resin). + plasticizer) or other thermoplastic synthetic resins.

The materials of these sheets A, C and F may be the same or different. Furthermore, these sheets A, C, and F are each bonded to each other by pressure bonding.
These may be joined with adhesive. Note that in this case, heating by the auxiliary heater 8 and the heater 10 of the transparent sheet C becomes unnecessary. Further, in the above embodiment, the laminated sheet E having a transparent pattern is manufactured continuously, but this need not be continuous. That is, there are cases where the vacuum forming of the forming sheet A is not performed continuously, and an operator manually joins the formed sheet B and transparent sheet C using, for example, an adhesive. As described above, the method of the present invention involves attaching the lace fabric forming mold 4 to the surface of the mold stand 3 having a large number of suction holes 25 of the vacuum forming apparatus 1, and heating the surface of the lace fabric forming mold 4 to the forming temperature. A molding sheet A made of a thermoplastic synthetic resin is placed on the molding sheet A, and the suction force generated by the reduced pressure from the many suction holes 25 is applied to the molding sheet A so that the molding sheet A corresponds to the many through holes 5 of the lace fabric mold 4 and is placed on the back side. A laminated sheet D is formed by forming a large number of protruding convex portions b, and pasting a transparent sheet C overlappingly on the surface of the molded sheet B having these convex portions b, and then this laminated sheet D is A laminated sheet E with a lace-like transparent pattern is produced by guiding the laminated sheet E to a cutting device 16 equipped with a cutter 20, and cutting and removing a large number of convex portions b on the back side of the laminated sheet D with the cutter 20. Since the surface of this laminated sheet E is made up of the flat transparent sheet C, it is resistant to stains.
Even if it gets dirty, it can be easily wiped off.

Since the lower molded sheet B having a transparent pattern in the laminated sheet E is integrally joined to the upper transparent sheet C, the continuous portion of the lower molded sheet B will not break even if pulled with a somewhat strong force. Therefore, the laminated sheet E can withstand long-term use. Furthermore, by integrally joining the transparent sheet C to the molded sheet B in this way, the molded sheet B can be made into a completely discontinuous shape, thereby making the lace pattern of the molded sheet B dotted. A laminated sheet E can also be produced, and a very wide variety of decorative sheet products can be produced.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic side view of an apparatus used in the method of the invention, FIG. 2 is a partially enlarged cross-sectional view of a vacuum forming device, and FIG. 3 is a portion of a cutting device. FIG. 4 is an enlarged sectional view, FIG. 4 is a partial perspective view of the laminated sheet, FIG. 5 is an enlarged sectional view taken along line V-V in FIG. 4, and FIG. 6 is an enlarged view corresponding to FIG. FIG. 1... Vacuum forming device, 2... Rotating drum, 3...
Mold stand, 4... Loose ground mold, 5... Through hole, 6, 10.
... Heater, 7, 9, 13, 14, ]5 ... Guide roll, 11 ... Pressure roll, ]2 ... Cooling device, 16
... Cutting device, 20... Cutter 25... Suction hole, A... Forming sheet, B... Forming sheet, C...
... Transparent sheet, D... Laminated sheet, E... Laminated sheet having a transparent pattern.

Claims (1)

[Claims] 1 Mold table 3 having a large number of suction holes 25 of vacuum forming apparatus 1
A lace fabric mold 4 is attached to the surface of the lace fabric mold 4, and a thermoplastic synthetic resin molding sheet A heated to the molding temperature is placed on the surface of the lace fabric mold 4, and the suction force due to reduced pressure from the numerous suction holes 25 is applied. Accordingly, a large number of convex portions b corresponding to the large number of through holes 5 of the lace fabric forming mold 4 and protruding from the back side are formed on this forming sheet A.
A laminated sheet D is formed by superimposing and sticking a transparent sheet C on the surface of the molded sheet B having these convex portions b, and then this laminated sheet D is cut with a cutter 2.
0, where the laminated sheet D
A method for manufacturing a synthetic resin laminated sheet having a lace-like transparent pattern, characterized in that a laminated sheet E with a transparent pattern is manufactured by cutting and removing a large number of convex portions b on the back side with a cutter 20.