JP2935975B2 - Plastic composite sheet using nonwoven fabric and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic composite sheet suitably used as a constituent material of stationery and the like, and more particularly to a composite sheet made of polypropylene and nonwoven fabric and a method for producing the same.

[0002]

As a constituent material of stationery such as a pen case and various interior articles, a plastic material is preferably used. However, even if a plastic product is subjected to clear color printing, it cannot express a deep texture, and in that sense, there is a problem that the commercial value of stationery and the like is not sufficient. In addition, printing on a plastic sheet has a problem that a coating film must be formed on a plastic surface or expensive UV offset printing must be used in consideration of compatibility with printing ink. Here, it is conceivable to attach a paper sheet to a plastic sheet, but in this case, not only is it necessary to use an adhesive to attach the paper to the plastic, but also when assembling the molded sheet Also,
There is a problem that a strong adhesive is required. The present invention has been made in view of these problems,
An object of the present invention is to provide a plastic composite sheet that can easily and reliably produce a composite sheet, can be easily manufactured thereafter, and can produce a product with a deep and unique texture.

[0003]

In order to achieve the above object, a polypropylene composite sheet according to the present invention is formed by extruding a heat-melted and plasticized polypropylene material into a sheet and extruding the polypropylene sheet into an adhesive. After the non-woven fabric is polymerized in the state of having it, the two are pressed together by pressure, reheating is performed to remove the distortion of the polypropylene sheet, etc. It is a constituent material. The method for producing a polypropylene composite sheet according to the present invention comprises extruding a heat-melted / plasticized polypropylene material into a sheet and extruding the polypropylene / polypropylene material.
The nonwoven fabric is polymerized in a state where the sheet has adhesiveness, the two are pressed together by pressure, then reheated to remove the distortion of the polypropylene sheet, etc., and an appropriate uneven pattern is formed by the surface treatment unit. It is provided as a constituent material such as stationery supplies.

[0004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments. [First Embodiment] FIG. 1 is a diagram showing the configuration of a manufacturing machine for manufacturing a plastic composite sheet SH. This manufacturing machine comprises an extruder 1 for continuously extruding a plastic material by heating, melting and plasticizing it, and a T-die 2 for outputting a wide plastic sheet PP from a linear thin slit.
And a polishing unit 3 including polishing rolls 3a to 3c, and a nonwoven fabric (non-
nonwoven fabric supply unit 4 for supplying NW, an annealing unit 5, a surface treatment unit 6, and a take-off unit 7.
It is composed of In addition, the plastic composite sheet SH taken by the take-up unit 7 is sent to the cutting unit 8 and is appropriately cut. As shown in the figure, the extruder 1 is supplied with a plastic material from a hopper 1a. In this embodiment, polypropylene is used.
Is supplied. The polypropylene material supplied from the hopper 1a is extruded toward the T die 2 by a screw or the like after being heated by a cylinder. Therefore, T
A wide range of polypropylene sheet PP is output from the die 2, and the polypropylene sheet PP is polished and cooled while passing through the polishing rolls 3 a to 3 c. On the other hand, polishing roll 3
The nonwoven fabric NW after appropriate printing is supplied to b and 3c. Since the polypropylene sheet PP supplied to the polishing rolls 3b and 3c still has sufficient adhesiveness, the polypropylene sheet PP and the nonwoven fabric NW are pressed by being pressed by the polishing rolls 3b and 3c. . In addition, the polypropylene enters the fibers of the nonwoven fabric and is securely pressed. FIG. 2 illustrates a cross-sectional shape of a plastic composite sheet SH in which a polypropylene sheet PP and a nonwoven fabric NW are laminated. In the present invention, either the printing surface NWa or the non-printing surface NWb of the nonwoven fabric NW may be pressed against the polypropylene sheet PP, but the non-printing surface NWb may be
When pressure-bonded to the sheet PP, the printed surface NWa of the nonwoven fabric having a soft texture can be represented on the outer surface of the composite sheet SH. On the other hand, as shown in FIG.
Is pressed against the polypropylene sheet PP,
The printing surface NWa of the nonwoven fabric can be seen through the glossy transparent polypropylene sheet PP. The composite sheet SH laminated as shown in FIG. 2 in the polishing unit 3 is then reheated in the annealing unit 5 to remove the distortion of the polypropylene sheet PP. Next, the composite sheet SH is sent to the surface treatment unit 6, and an appropriate uneven pattern is provided on, for example, a polypropylene surface or a nonwoven fabric surface. Thereafter, the composite sheet SH is sent to the cutting unit 8 via the take-off unit 7. In the case of this embodiment, the thickness of the polypropylene sheet PP is about 0.4 mm. When the plastic composite sheet SH manufactured in this manner is used for, for example, stationery articles, the characteristics of polypropylene and the soft texture of the nonwoven fabric match, and a product with high commercial value can be produced. In other words, based on the properties of polypropylene, it is possible to make a stationery article that is hard and tough, excellent in moisture resistance, oil resistance, and solvent resistance, and expresses a characteristic pattern that makes use of the soft texture of the nonwoven fabric. it can. FIG. 3 is an example of a file storage device using the composite sheet SH, and FIG. 4 is a developed view of the file storage device. Although an appropriate pattern such as a lattice pattern is printed on the nonwoven fabric, it is not shown in FIGS. 3 and 4. 3 and 4 mainly comprises an opening / closing lid 13, a back surface 14, and a front surface 15, and the opening / closing lid 13 and the front surface 15 are provided with a key member 1 respectively.
6, 17 are mounted. Note that the tongue piece 16a of the key member 16 is locked and locked by the key member 17, and the key member 17 is locked.
The pressing portions 17a, 17a are unlocked by pushing inward. In order to assemble the file storage device, first, the broken line portion in FIG.
The dashed line in FIG. 4 is bent in a valley fold. In this way, when bending of the broken line portion is completed, the bonding margins 10a,
11a and 12a are polymerized, and the bonding margin 10b, 1
1b and 12b also polymerize. Therefore, the bonding margin is welded by an ultrasonic welder or a heat welder. In the case of the present invention, since the polypropylene has sufficiently penetrated into the fibers of the nonwoven fabric, the bonding margins 10a to 12a and 10b to 12b can be reliably welded without using a special adhesive. 5 and 6 illustrate another file storage device. The broken line portion 16 in FIG. 5 is a bent portion. After bending the broken line portion 16, an appropriate bellows member 17 is provided on the side surface of the file storage device.
Is welded. Also in this embodiment, it may be necessary to weld the bellows member 17 and the nonwoven fabric, but since the polypropylene has sufficiently penetrated into the fibers of the nonwoven fabric,
Both can be reliably welded by an ultrasonic welder or a heat welder.

[Second Embodiment] In the first embodiment described above, the nonwoven fabric NW after the printing process is used. However, after the composite sheet SH is completed, printing is performed on the nonwoven fabric surface of the composite sheet SH. You may do it. In this case, the manufacturing machine is the same as in FIG. 1, but the nonwoven fabric NW before the printing process is supplied from the nonwoven fabric supply unit 4. Further, the plastic composite sheet SH taken by the taking unit 7 preferably has a thickness of 0.3 mm or less. The plastic composite sheet SH having such a thickness is thereafter supplied to an offset rotary press, and an appropriate pattern is printed on the surface of the nonwoven fabric. Since the plastic composite sheet SH of the present invention has a nonwoven fabric surface, it is not necessary to provide a coating film for printing on the surface as in the case of printing on a plastic sheet, and the composite sheet SH is directly and sharply printed. Color printing can be performed. Further, there is no need to use expensive UV offset printing as in the case of printing on a polypropylene sheet, and this point is also excellent.

[0006]

As described above, the composite sheet of the present invention is formed by extruding a plastic material that has been heated and melted and plasticized into a sheet shape and extruding a non-woven fabric while the plastic sheet has an adhesive property. Then, the nonwoven fabric is adhered to the plastic sheet by passing the two through a polishing roll. Therefore, no adhesive is required to produce the composite sheet, and the composite sheet can be produced simply and reliably. Also, since the plastic material is well penetrated into the fibers of the non-woven fabric, the necessary parts can be welded only by the ultrasonic welder or the hot welder in the subsequent work. Then, in the finished product, the nonwoven fabric layer appears directly or through the plastic layer, so that it is a unique and novel product with a deep texture. In addition, when printing a pattern by offset printing after manufacturing the composite sheet,
Further, work efficiency is increased.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a machine for producing a plastic composite sheet of the present invention.

FIG. 2 illustrates a laminated structure of a plastic composite sheet.

FIG. 3 is a file storage device manufactured using a plastic composite sheet.

FIG. 4 is a development view of the file storage device of FIG. 3;

FIG. 5 is a development view of another file storage device.

FIG. 6 illustrates an assembled state of the file storage device of FIG. 5;

[Explanation of symbols]

 SH plastic composite sheet PP plastic sheet NW non-woven fabric 3a-3c polishing roll

Continuation of the front page (51) Int.Cl. ⁶ identification code FI B29L 9:00 (58) Field surveyed (Int.Cl. ⁶ , DB name) B32B 1/00-35/00 B29C 47/00-47 / 96

Claims (2)

(57) [Claims] 1. A method in which a heat-melted and plasticized polypropylene material is extruded in a sheet form, and the non-woven fabric is polymerized in a state where the polypropylene sheet has adhesiveness. A polypropylene composite sheet that is reheated to remove distortions and the like of the polypropylene sheet, and provided with an appropriate uneven pattern by a surface treatment unit to be used as a constituent material for stationery articles and the like. 2. A method of extruding a heat-melted and plasticized polypropylene material into a sheet, extruding a non-woven fabric in a state where the polypropylene sheet has an adhesive property, and pressing the two by pressure. A method for producing a polypropylene composite sheet, which is reheated to remove distortion and the like of the polypropylene sheet, and provided with an appropriate uneven pattern by a surface treatment unit to be used as a constituent material for stationery articles and the like.