JPH0482983A - Apparatus and method for removing recorded image of paper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an apparatus and method for erasing recorded images on paper, which makes the contents of images recorded on paper by thermal transfer unreadable.

[Prior Art] In recent years, image forming materials that become soft and viscous due to heat, such as general dry PPC toner, electrophotographic toner for laser printers, thermal transfer sheet for small word processors, etc. 2. Description of the Related Art Characters, graphs, figures, etc. are increasingly recorded on paper using heat-softening materials processed into ribbons, belts, and the like.
When these images recorded on paper contain content that requires confidentiality, conventionally the paper on which the images are recorded is shredded into small pieces using a shredder.

[Problem that the invention aims to solve] However, recently, paper reuse has been attracting attention for the purpose of resource conservation and environmental conservation, and in particular, the use of copied paper and printed paper used in offices is rapidly increasing. Efforts are now being made to reuse it.

However, when paper is shredded into small pieces using a shredder to maintain confidentiality, the fibers that make up the paper are cut, and it is known that the paper properties of recycled paper made from the shredded paper deteriorate. .

For example, recycled paper made from paper cut to a width of 2mm in the papermaking direction and 20mm long perpendicular to the papermaking direction is tested using a Schopper tensile tester compared to recycled paper made from uncut paper. As a result, it was found that the tensile strength was reduced by about 20%.

In order to prevent the paper properties of recycled paper from deteriorating, this invention uses a heat-softening substance to peel off records such as characters and figures recorded on paper from the paper, making them illegible, and eliminating the need to cut the paper. The object of the present invention is to provide a paper recorded image erasing device.

[Means for Solving the Problems] The present invention includes two parallel rolls that rotate in pressure contact with each other and allow the paper to pass through the pressure contact area, and a heater that heats at least one of the two rolls. , comprising a scraping tool that separates the paper that has passed through the pressure contact area of the two rolls from the roll, and a peeling device that removes the image forming substance adhering to the roll from the roll. The present invention relates to a paper recorded image removal device and a paper recorded image removal method characterized by removing an image forming substance recorded on paper by heating and softening it.

[Function] The image forming substance adhered to the paper is softened by the heat of the roll and peeled off from the paper, and is removed after adhering to the roll, making the image recorded on the paper difficult to read.

[Example code] Next, the present invention will be explained in detail.

FIG. 1 is a side view of an embodiment of the present invention, in which papers 2 having recorded images are placed one on top of the other on a tray 1, and a pick-up roll 3 is placed on the top paper 2. Paper 2 placed on tray 1, stacked on top of each other, comes into contact with each other without rotating.
are sent out one by one from the top to the left in Figure 1.

A paper feed roll 4 is provided on the left side of the tray 1 in FIG. 1, and a friction pad 5 is in contact with the lower side of the paper feed roll 4. The above-mentioned call roll 3 carries out the paper 2 sent out to the left by this call roll 3.
When the leading edge of the paper reaches the paper feed roll 4, it rises due to the excitation of the solenoid and separates from the paper 2. When the paper 2 is fed from the pick-up roll 3, the paper feed roll 4 It detects that there is no preceding paper on the left side of the figure), rotates clockwise, and connects the paper feed roll 4 and friction pad 5.
The paper is sent out between the guide plates 6 and 7 through the space between the guide plates 6 and 7. Here, the coefficient of static friction between the front surface of the paper and the paper feed roll 4 is set to be larger than the coefficient of static friction between the back surface of the paper and the front surface of the second sheet of paper. This is a technology widely used in copying machines, etc., and by doing this, even if two sheets of paper 2 are sent from the pick-up roll 3 to the paper feed roll 4 in an overlapping state, the friction pad The lower paper in contact with the paper feed roll 4 will not be sent out toward the guide plate 6.7, and only the upper paper in contact with the paper feed roll 4 will be sent out between the guide plates 6 and 7.

Two rolls 8.9 are provided in parallel adjacent to the left side of the guide plate 6.7 in FIG. 8. The roll 8 is rotated clockwise by a motor and transmission mechanism (not shown), and the roll 9 is accordingly rotated counterclockwise, so that the paper is fed from the paper feed roll 4 between the guide plates 6 and 7. is sandwiched between the press-contact points of rolls 8 and 9, and passed to the left in FIG. The material of the rolls 8 and 9 is made of heat-resistant materials such as metal, silicone resin, and fluorine resin, and a heater I2 is provided in the center to keep the surface temperature of the rolls 8 and 9 at a maximum of approximately 250°C. It can be heated. The diameter of rolls 8 and 9 is 1o, including heat capacity.
A temperature of ~100 cm is appropriate, and the thermistor 3 is used to control the temperature. Note that the heater 2 may be provided only on one of the two rolls 8.9.

The surfaces of the rolls 8 and 9 are provided with circumferential grooves 14 as shown in FIG. 2, and the tip of a scraping tool 15 such as a heat-resistant wire or thin plate is inserted into the groove 14. The paper that has passed between the rolls 8.9 is separated from the rolls 8, 9 and then transferred to the rolls 8.9.
I try not to wrap it around 9. The base end of the scraper 15 is attached to a fixed member 16 to prevent it from moving.

The rolls 8,9 are provided with a stripping device 17 for removing from the rolls 8,9 image-forming substances that have migrated from the paper and adhered thereto. The peeling device 17 in the illustrated embodiment is a blade made of metal or heat-resistant resin that is pressed against the roll 8.9 by a spring 18, but it may also be a brush or a third roll in contact with the roll 8.9. , the third
The image forming substance adhering to the roll may be removed. If the paper 2 has an image on only one side and is stacked on the tray 2 with that side aligned on one side, the peeling device 17 only needs to be attached to one of the rolls 8.9.

Next, the operation will be explained. The sheets having images placed on the tray 1 are fed one by one from the top by the pickup roll 3 between the paper feed roll 4 and the friction pad 5. The paper feed roll 4 detects that there is no preceding paper,
The paper sent from the calling roll 3 is passed through the guide plates 6 and 7.
It is inserted into the pressure contact area of the rolls 8 and 9 through the gap between the rolls 8 and 9.

The paper bearing the image is heated as it passes through the pressure points of the rolls 8 and 9, and the image-forming substance such as toner forming the image is softened by the heat, separates from the paper, and adheres to the surface of the rolls 8 and 9. do. The surface temperature of the rolls 8 and 9 varies depending on the paper passing speed and the pressure of the rolls 8 and 9, but it is 150
~220°C is preferred. A small amount of the imaging substance may remain on the paper, but the image will be largely unreadable.

After the image-forming substance that had formed the image was removed and the paper became illegible, it passed between rolls 8 and 9, and was recovered and used as raw material for recycled paper. The forming material is removed from the rolls 8, 9 by a stripping device 17.

[Effects of the Invention] This invention makes it possible to remove images and make them illegible without cutting the paper on which the image has been recorded, so it is possible to use this paper as a raw material to make recycled paper with good paper properties without decreasing strength. can.

[Brief explanation of the drawing]

FIG. 1 is a side view of one embodiment of the present invention, and FIG. 2 is a perspective view of the roll and scraper. ■... Tray 2... Paper, 3... Pick up roll, 4... Paper feed roll, 5... Friction pad,
6.7...Guide plate, 8,9...Roll, 10...
・Pressure spring, 11...Lever 12...Heater, 13...Thermistor, 14...Groove, 15...
Scraping tool, 16... Fixing member, 17... Peeling device, 1
8...Spring.

Claims (3)

[Claims] (1) Two parallel rolls that rotate in pressure contact with each other and allow the paper to pass through the pressure contact area; a heater that heats at least one of the two rolls; and a heater that heats at least one of the two rolls; An apparatus for erasing recorded images on paper, comprising: a scraping tool that separates the passed paper from the roll; and a peeling device that removes the image forming substance adhering to the roll from the roll. (2) The paper recorded image removal device according to claim (1), further comprising a mechanism for feeding out the stacked papers one by one. (3) A method for removing recorded images on paper, which comprises removing an image forming substance recorded on paper by heating and softening it.