JP3603384B2 - Inkjet recording sheet housing - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an ink jet recording sheet housing. In particular, the present invention relates to a housing for an ink jet recording sheet having an ink receiving layer on its surface (hereinafter, also simply referred to as a recording sheet).
[0002]
[Prior art]
The ink jet recording method is a recording method in which ink droplets are ejected onto a recording sheet and an image (including characters) is formed by using the dots to perform recording.
[0003]
As recording sheets used in such an ink jet recording method, in addition to plain paper, coated paper and the like (coated paper, OHP (overhead projector) sheet, glossy paper, glossy film, and the like, the same hereinafter) are known.
[0004]
Coated paper or the like generally has a porous ink-receiving layer on the surface of a sheet-like substrate. The ink receiving layer is composed of a pigment, a binder, and an auxiliary. As the pigment, a porous pigment having a low refractive index is used in order to obtain high ink absorbency and high color density, and amorphous silica is most frequently used. As the binder, a water-soluble resin having good film-forming properties is used in order to obtain fixing strength and ink absorbability, and PVA (polyvinyl alcohol) and polymer latex are often used. As the auxiliary agent, a cationic resin for improving water resistance, a light stabilizer for improving light resistance, a fluorescent whitening agent for improving whiteness, and the like are used.
[0005]
According to such coated paper or the like, a recording state having a higher color density and a clearer hue than plain paper, that is, a recording state with high color reproducibility can be obtained. In addition, the feathering phenomenon that bleeds along the pulp fibers in a beard shape is suppressed, and the dot roundness is improved. Further, since the dot diameter can be controlled by selecting the components in the ink receiving layer, it is possible to increase the resolution.
[0006]
Therefore, such coated paper is suitable for obtaining a high-resolution color image.
[0007]
Conventionally, a plurality of such coated papers have been sold in a polypropylene bag.
[0008]
[Problems to be solved by the invention]
As an ink jet recording apparatus, the one shown in FIG. 4 is known.
[0009]
In FIG. 1, reference numeral 11 denotes a paper feed tray, 12 denotes a feed roller, 13 denotes a conveyance roller, 14 denotes a pinch roller, 15 denotes an ink jet head, 16 denotes a discharge roller, and 17 denotes a discharge jagged roller.
[0010]
A plurality of recording sheets S are set on the paper feed tray 11 in a stacked state. The paper feed tray 11 presses the recording sheet S toward the feed roller 12 with a predetermined force F1 when the recording sheet is fed.
[0011]
The feed roller 12 is a rubber roller (a roller having a rubber layer on at least its surface; the same applies to the following description). The feed roller 12 rotates at the time of feeding and feeds the uppermost recording sheet S1.
[0012]
The transport roller 13 is a rubber roller, and the pinch roller 14 is pressed against the rubber roller by a predetermined force F2. At least the transport roller 13 is configured as a drive roller. Therefore, the fed recording sheet S is conveyed while being nipped by the conveying roller 13 and the pinch roller 14.
[0013]
The inkjet head 15 ejects ink droplets on the surface of the recording sheet S to form an image.
[0014]
The discharge roller 16 is a rubber roller, and the discharge toothed roller 17 is pressed against the discharge roller 16 with a predetermined force F3. The discharge roller 16 is configured as a driving roller, and the discharge toothed roller 17 is generally configured as a driven roller. Accordingly, the recorded recording sheet is conveyed and discharged while being nipped by the discharge roller 16 and the discharge toothed roller 17.
[0015]
The peripheral speed of the discharge roller 16 is slightly increased with respect to the peripheral speed of the transport roller 13, and the recording sheet S during recording is transported in a state where the recording sheet S is stretched between the transport roller 13 and the discharge roller 16. Is done. Therefore, the conveyance force by the discharge roller 16 affects the conveyance accuracy of the recording medium during recording.
[0016]
In such an apparatus, the recording sheet S fed from the paper feed tray 11 is reversed by being wound around the transport roller 13 and is discharged to the paper feed tray 11 side.
[0017]
Therefore, the recording sheet S is set on the paper feed tray 11 with its back surface (non-recording surface) positioned above.
[0018]
For example, when recording is performed in the above-described apparatus, the recording sheets S need to be reliably fed one by one by the feed roller 12.
[0019]
However, conventionally, when a plurality of recording sheets are all taken out from the above-mentioned polypropylene bag, and are set as they are in the paper feed tray 11 and the apparatus is operated, the topmost recording sheet S1 is not fed. There was a problem that there is.
[0020]
As a result of investigating the cause, the polypropylene bag contains a relatively large amount of slip agent in order to improve the handleability, and this slip agent adheres to the back surface of the uppermost recording sheet S1. Therefore, it was found that the feed roller 12 slipped.
[0021]
Further, even when the uppermost recording sheet S1 is fed, since the slip agent from the polypropylene bag adheres to the back surface, the conveyance accuracy by the conveyance roller 13 and the discharge roller 16 is reduced, There is also a problem that the quality of a high-resolution image to be obtained by the action of the ink receiving layer may be impaired.
[0022]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems, and to reliably feed a recording sheet even when the recording sheet is taken out of a storage bag and set it in an apparatus as it is, to thereby reliably obtain a high-resolution image. It is to provide a storage body.
[0023]
[Means for Solving the Problems]
In order to achieve the above object, an ink jet recording sheet container according to claim 1 is a container in which an ink jet recording sheet having an ink receiving layer on its surface is stored in a polypropylene bag, and faces the inner surface of the bag. A protective sheet is interposed between the back surface of the ink jet recording sheet and the inner surface of the bag.
[0024]
According to a second aspect of the present invention, in the ink jet recording sheet housing of the first aspect, the base material of the ink jet recording sheet is a transparent or white polyethylene terephthalate film.
[0025]
According to a third aspect of the present invention, there is provided the ink jet recording sheet housing according to the first or second aspect, wherein the protective sheet has a thickness of 50 μm to 2 mm.
[0026]
[Action]
According to the ink jet recording sheet housing of the first aspect, since the ink jet recording sheet having the ink receiving layer on the surface is stored in the polypropylene bag, the handleability of the bag, for example, the handleability in an automatic packaging machine or the like is improved. It is not spoiled.
[0027]
And since a protective sheet is interposed between the back surface of the ink jet recording sheet facing the inner surface of the bag and the inner surface of the bag, the slip agent from the bag does not adhere to the back surface of the ink jet recording sheet. .
[0028]
Therefore, even if the recording sheet is taken out of the storage bag and set in the recording apparatus as it is, the recording sheet is reliably fed.
[0029]
Further, since the slip agent does not adhere to the back surface of the recording sheet, the accuracy of conveyance by the conveyance roller or the like does not decrease, and a high-resolution image to be obtained by the action of the ink receiving layer can be reliably obtained.
[0030]
When the base material of the recording sheet is a polyethylene terephthalate film, if this is stored in a polypropylene bag, there is a problem that the slip agent is more likely to adhere.
[0031]
Therefore, the present invention is particularly effective when the base material of the recording sheet is a polyethylene terephthalate film.
[0032]
According to the ink jet recording sheet housing of the third aspect, in the ink jet recording sheet housing of the first or second aspect, since the thickness of the protective sheet is 50 μm to 2 mm, the following effects can be obtained. .
[0033]
That is, when the thickness of the protective sheet stored in the polypropylene bag together with the recording sheet is 50 μm or less, the storage body is easily bent when the number of recording sheets stored in the bag is small, and therefore, the recording sheet is There is a problem that the vehicle is easily bent.
[0034]
Conversely, if the thickness of the protective sheet is 2 mm or more, there is a problem that the bag is easily broken by vibration during transportation of the storage body. In addition, it causes a cost increase.
[0035]
On the other hand, according to the ink jet recording sheet housing of the third aspect, since the thickness of the protective sheet is 50 μm to 2 mm, the recording sheet hardly bends even when the number of recording sheets stored in the bag is small. Further, the bag is less likely to be broken by vibration during transportation of the storage body, and the cost can be reduced.
[0036]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0037]
FIG. 1 is a schematic view showing an embodiment of the ink jet recording sheet housing according to the present invention.
[0038]
As shown in FIG. 1, the ink jet recording sheet housing 10 of the present embodiment is a housing in which a plurality of ink jet recording sheets S are housed in a polypropylene bag 3 and faces the inner surface 3 a of the bag 3. The protective sheet PS is interposed between the back surface Sna of the recording sheet Sn and the inner surface 3a of the bag.
[0039]
As shown in FIG. 2, the recording sheet S has a porous ink receiving layer 2 on the surface of a sheet-like substrate 1.
[0040]
The sheet-like substrate 1 is made of paper, a transparent or white synthetic resin film (for example, a polyethylene terephthalate film) or the like.
[0041]
As the ink receiving layer 2, a known one can be used. For example, it is composed of a pigment, a binder, and an auxiliary agent. Amorphous silica is used as the pigment, and a water-soluble resin having good film-forming properties such as PVA (polyvinyl alcohol) and polymer latex is used as the binder. As the auxiliary agent, a cationic resin for improving water resistance, a light stabilizer for improving light resistance, a fluorescent whitening agent for improving whiteness, and the like are used.
[0042]
The ink receiving layer 2 can be formed by coating. As a coating method, known coating methods such as a blade coater, an air knife coater, a roll coater, a kiss coater, a squeeze coater, a curtain coater, a bar coater, a gravure coater, and a comma coater can be used. Can be appropriately selected from coating methods using a coating machine.
[0043]
The protective sheet PS may be any sheet material that can prevent the slip agent from the bag 3 from adhering to the recording sheet Sn. For example, paper can be used.
[0044]
The thickness of the protective sheet PS is desirably 50 μm to 2 mm.
[0045]
When the thickness of the protective sheet PS is 50 μm or less, the storage body is easily bent when the number of the recording sheets S stored in the bag 3 is small, and therefore, the recording sheet S is easily bent. Conversely, if the thickness of the protective sheet PS is 2 mm or more, the bag 3 is easily broken due to vibration during transportation of the storage body, and also causes an increase in cost.
[0046]
On the other hand, by setting the thickness of the protective sheet PS to 50 μm to 2 mm, even when the number of the recording sheets S stored in the bag 3 is small, the recording sheets S are hardly bent, and when the storage body is transported. The bag 3 is less likely to be broken by vibrations at the same time, and the cost can be reduced.
[0047]
According to the ink jet recording sheet housing 10 of this embodiment, since the ink jet recording sheet S having the ink receiving layer 2 on the surface is stored in the polypropylene bag 3, the handleability of the bag 3, for example, an automatic packaging machine or the like Does not impair handling.
[0048]
Since the protective sheet PS is interposed between the back surface of the recording sheet Sn facing the inner surface 3a of the bag 3 and the inner surface 3a of the bag, slippage from the bag 3 is applied to the back surface Sna of the recording sheet Sn. No agent adheres. In addition, as for the recording sheets other than the recording sheet Sn, the recording sheet adjacent to the recording sheet itself serves as a protective sheet, so that the slip agent from the bag 3 does not adhere to the back surface.
[0049]
Therefore, even if the recording sheet S is taken out of the storage bag 3 and set as it is in the recording apparatus, the recording sheet S is reliably fed.
[0050]
Further, since the slip agent does not adhere to the back surface of the recording sheet S, the accuracy of conveyance by the conveyance roller or the like does not decrease, and a high-resolution image to be obtained by the action of the ink receiving layer 2 can be reliably obtained.
[0051]
Note that a lubricant can be applied to the back surface (that is, the non-recording surface) 1a of the recording sheet S as needed.
[0052]
Since the surface of the recording sheet S having the ink receiving layer 2 is smoother than that of plain paper like the above-described coated paper and the like, it is easy for the recording sheets S to adhere to each other when they are laminated. Therefore, when the recording sheets S are set in a stacked state on the sheet feeding tray of the recording apparatus, there is a possibility that the recording sheets are double-fed due to mutual adhesion (two or more recording media are fed together). For example, in FIG. 4, the recording sheet S1 to be fed at the uppermost position of the sheet feeding tray 11 is less likely to slip with respect to the lower recording sheet S2, and the recording sheet S2 is fed together with the recording sheet S1. It becomes easy to be.
[0053]
Therefore, in order to prevent such double feeding, a lubricant can be applied to the back surface 1a of the recording sheet S as needed.
[0054]
Therefore, the lubricant in this case is formed of such a material and an amount of application that the double feeding of the recording sheet S is prevented. However, the recording sheet S having the lubricant applied to the back surface is tentatively described as a conventional technique. If the polypropylene bag is directly stored in the polypropylene bag, the slip agent of the polypropylene bag adheres to the coating layer of the lubricant, and the slip agent is more easily slipped on a rubber roller such as a feed roller.
[0055]
On the other hand, according to the configuration in which the protective sheet PS is interposed between the inner surface 3a of the bag and the back surface of the recording sheet Sn facing the inner surface 3a of the bag 3 as in the present embodiment. Even if a lubricant is applied to the back surface of the recording sheet S, the friction coefficient between the rubber roller such as a feed roller and the back surface 1a of the recording sheet S is sufficiently ensured.
[0056]
Note that a protective sheet (not shown) may be interposed between the recording surface of the recording sheet S stored in the bag 3 and the inner surface 3a of the bag.
[0057]
FIG. 3 is a side view showing an internal structure of an example of an ink jet printer as a recording device.
[0058]
This printer has the same type as the apparatus shown in FIG. 4, and therefore, in FIG. 3, parts corresponding to those of the apparatus shown in FIG. 4 are denoted by the same reference numerals.
[0059]
Using such a printer, the recording sheet S is taken out of the storage bag 3 and set as it is on the paper feed tray 11 to record an image. Also, no slippage occurred in the discharge roller 16, and a high-quality color image could be obtained.
[0060]
As mentioned above, although one Example of this invention was described, this invention is not limited to the said Example, It can change and implement suitably within the range of the summary of this invention.
[0061]
For example, the number of recording sheets S stored in the bag 3 may be one instead of a plurality.
[0062]
【The invention's effect】
According to the present invention, even if the recording sheet is taken out of the storage bag and set in the apparatus as it is, the recording sheet is reliably fed, and a high-resolution image can be reliably obtained.
[0063]
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of an ink jet recording sheet housing according to the present invention.
FIG. 2 is a schematic partial cross-sectional view illustrating an example of a recording sheet.
FIG. 3 is a side view showing the internal structure of an example of the ink jet printer.
FIG. 4 is a schematic view showing an example of an ink jet printer.
[Explanation of symbols]
S Inkjet recording sheet PS Protective sheet 2 Ink receiving layer 3 Polypropylene bag 10 Inkjet recording sheet housing

Claims (3)

A storage body in which an ink jet recording sheet having an ink receiving layer on its surface is stored in a polypropylene bag, and a back surface of the ink jet recording sheet facing the inner surface of the bag, and a protective sheet between the inner surface of the bag. An ink jet recording sheet storage body characterized by being interposed. 2. The ink jet recording sheet housing according to claim 1, wherein the base material of the ink jet recording sheet is a transparent or white polyethylene terephthalate film. The ink jet recording sheet housing according to claim 1, wherein the thickness of the protective sheet is 50 μm to 2 mm.

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