JPH0712273U - Synthetic resin file - Google Patents

Abstract

(57) [Abstract] [Purpose] In a synthetic resin file, the problem of using a flexible thermoplastic resin foam sheet material as a cover material is solved, and the file bag is firmly welded to the foam sheet material, Provide something that is easy to use. [Structure] The thermoplastic resin sheet is used as the front cover, back cover, and back cover, while a plurality of thermoplastic resin file bags of the same size as the file cover are stacked, and the center of the back cover inside In a synthetic resin file that is welded so that it can be folded in two and bound, the thermoplastic resin sheet is a foam material, and the binding portion on the inner surface of the back cover is locally heated and pressed to form a solid material. The plurality of file bags are superposed on the solid material portion and ultrasonically welded.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a synthetic resin file.

[0002]

[Prior art]

 Currently, a synthetic resin file in which a plurality of transparent file bags are stacked and bound is used, but a thermoplastic resin solid material is generally used as a file cover material. However, since the cover material is made of a flexible sheet to reduce the weight and cost of the file, it has the drawbacks that it is fragile and lacks in the preservation of the file document and is not easy to use. Therefore, it is proposed to use thick letter material as the cover material of the file, but there is a drawback that the heat welding method is difficult to use for binding the file bag, productivity is lowered and cost is increased.

[0003]

[Problems to be solved by the device]

 Therefore, a method is proposed in which a flexible and lightweight thermoplastic resin foam sheet material is used as the cover material, and a thermoplastic resin file bag is bound by a highly productive thermal welding method. When the welding method is used, the foaming sheet material has poor fusing capacity for the file bag and can be finally welded over time, but the foam material squeezes out on both sides of the welding binding part, and the surface of the welding A new problem has arisen that the deformation on the side is remarkable and the commerciality is reduced. The present invention solves the problem of using a flexible thermoplastic resin foam sheet material as the cover material and firmly welds the file bag to the foam sheet material, providing a synthetic resin file that is easy to use. The purpose is to do.

[0004]

[Means for Solving the Problems]

 In the present invention, if the binding portion of the thermoplastic resin file bag to the thermoplastic resin foam sheet material is heated and pressed to locally transform it into a solid system before welding, the ultrasonic weldability is improved, which causes problems. We have found that the thermoplastic resin file bag can be welded without the need to use it, and have completed it.The thermoplastic resin sheet is used as the file cover material for the front, back, and back covers, while it is equivalent to the file cover material. In a synthetic resin file in which a plurality of thermoplastic resin file bags having a size are overlapped and the inner surface of the spine cover is welded so that it can be folded in two at the center, the thermoplastic resin sheet is a foam material, The binding portion on the inner surface of the cover sheet is locally heated and pressed to form a solid material, and the plurality of file bags are superposed on the solid material portion by ultrasonic welding. It is in a synthetic resin file that features that.

When the foamed sheet is used as a file cover material, it is necessary to form a fold line in a portion which will be a spine cover. Therefore, it is preferable to form the solid material portion of the binding portion and to form the folding lines on both sides of the spine sheet under heating and pressure in order to reduce the number of steps.

[0006]

[Effect of action and device]

 According to the present invention, since the foamed sheet can be used as a file cover material, a lightweight and strong cover file can be provided and can be replaced with a paper cover material. Moreover, since files can be bound by ultrasonic welding, manufacturing is easy. Further, the step of transforming the welded portion of the foamed sheet into a solid system by heating and pressing can be performed together with the folding line formation of the spine cover, which is essential when using the foamed sheet, and is therefore suitable for mass production.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail based on specific examples. FIG. 1 shows the manufacturing process of a synthetic resin file according to the present invention, and 1 is a cover material of A4 size file, which is composed of a double expanded polypropylene sheet (F-cell manufactured by Furukawa Electric Co., Ltd.) (see (a)). In addition to heating and pressing the two folding lines 11 and 11 with a width of 1.5 cm in the lateral central portion, a spine cover 10b sandwiched between the folding lines 11 and 11 is formed, and the inner surface of the spine cover 10b is formed. The binding portion 12 is heated and pressed to form a solid material so that the foamed state does not substantially remain (see (b)). Then, 10 pieces of the transparent polypropylene file bags 2 that are folded in two to be A4 size bags are overlapped and ultrasonically welded onto the binding portion 12 (see (c)). An ultrasonic welder (sedeco Seidensha Electronics Co., Ltd.) was used for ultrasonic welding. Specifically, ten transparent file bags 2 are set on the cover material 1, the tool horn of the ultrasonic welder is lowered, and the welding portion 21 of the file bag 2 is pressed onto the binding portion 12 to a predetermined position. Oscillate for time and raise the tool horn. In the above embodiment, the binding section 12 is provided only in the vertical direction. However, when the back cover is wide, the binding sections 12 are provided in parallel in two rows so that 10 file bags are welded to each binding section. You can also

[Brief description of drawings]

1 shows a manufacturing process of a synthetic resin file according to the present invention, (a) is a plan view of a cover material and a sectional view taken along the line AA, and (b) is a fold line and binding at the center of the cover material. Plan view showing a state in which a portion is formed by heating and pressurizing it and B-
A cross-sectional view taken along the line B, (c) is a plan view showing a state in which a file bag is laid on the cover material and ultrasonically welded, and its C-
It is a C line sectional view.

[Explanation of symbols]

 1 Cover Material Made of Thermoplastic Resin Foamed Sheet 10b Back Cover 11 Folding Line 12 Binding Part 2 Thermoplastic Resin File Bag 21 Welding Part

Claims (2)

[Scope of utility model registration request] 1. A thermoplastic resin sheet is used as a front cover sheet, a back cover sheet, and a back cover sheet, and a plurality of thermoplastic resin file bags having the same dimensions as the file cover material are superposed on each other to form an inner surface of the back cover sheet. In a synthetic resin file that is welded in two so that it can be folded in two at the center and bound, the thermoplastic resin sheet is a foam material, and the binding portion on the inner surface of the spine is locally heated and pressed to form a solid material. A synthetic resin file, characterized in that the plurality of file bags are superposed on the solid material portion and ultrasonically welded. 2. The synthetic resin file according to claim 1, wherein the folding lines on both sides of the spine cover are formed by heating and pressing together with the formation of the solid material portion of the binding portion.