JPH02127042A - Composite sheet material for packaging transfer paper and packaging method - Google Patents

Abstract

PURPOSE:To prevent the inter-volume stacked feed of transfer paper by laminating sheet base materials onto both surfaces or a polyolefin film, low-molecular extraction of which by methanol is brought to 0.25wt.% or less, and forming a composite sheet, material for packaging transfer paper. CONSTITUTION:Sheet base materials 11, 12 are welded to both surfaces of a polyolefin film 2, which is composed of at least one kind selected from polypropylene, polyethylene and an ethylene-propylene copolymer and low- molecular extraction of which by methanol is brought to 0.25wt.% or less, thus shaping a composite sheet 3 for packaging transfer paper. Transfer paper 5 is packaged by the composite sheet 3, and the volume of transfer paper is manufactured. Transfer paper 5 is packaged by the composite sheet 3 having laminated structure, in which the sheet base materials 11, 12 are stuck onto both surfaces of the polyolefin film 2 by adhesives 4, and the volume of transfer paper is manufactured as an alternative method.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a composite sheet material for packaging transfer paper and a packaging method for preventing double feeding between machines.

BACKGROUND OF THE INVENTION Transfer paper used in electrophotographic copying machines, printers, etc. is packaged with moisture-proof wrapping paper, which is a sheet base material laminated with a polyethylene resin, in order to prevent the paper from absorbing moisture. Conventionally, this moisture-proof wrapping paper has been made of laminated resin that has a good balance of quality such as adhesive strength of the laminated layer, moisture proofness, heat seal strength, abrasion resistance, etc., excellent extrusion coating processability, excellent hygiene, Low-density polyethylene is overwhelmingly used due to cost reasons, and is laminated onto a sheet base material by extrusion coating.

Problems to be Solved by the Invention However, in general, in extrusion coating, resin is usually discharged from a T-die of an extruder at a high temperature of 300°C or higher in order to adhere to the sheet base material. Low-molecular-weight substances are produced by partial molecular cleavage due to shearing force under the high humidity inside the machine, and the resin undergoes oxidation in the air at the same time as it is discharged. These low molecular weight substances generated through decomposition or oxidation cause problems such as causing odors, and also cause contact transfer to the surface of other base materials, reducing the coefficient of friction of that surface. cause.

Therefore, when a book of sheet-fed transfer paper is wrapped using moisture-proof wrapping paper manufactured by such extrusion coating, the top surface of the transfer paper at the top of the book and the bottom surface of the transfer paper at the bottom of the book The extrusion coated film surface comes into contact with the extrusion coating, and the low molecular weight substances produced during the extrusion coating process are transferred. As a result, when you unwrap a stack of books of transfer paper, stack multiple books of transfer paper, and load them into the paper tray of a copying machine or printer to feed them, the transfer paper on the top of the book The surfaces with lower friction coefficients of the bottom transfer paper overlap each other, and when a copying machine or printer is feeding sheets, these transfer papers overlap and are fed. That is, there is a problem in that a phenomenon of double feeding between devices occurs.

This phenomenon is particularly likely to occur in devices that have only a snapper mechanism for the paper feeder and have less than 82 paper mechanisms such as paper handling rolls. This problem often occurs when the paper handling mechanism is constructed by simplifying the mechanism and using only the snapper claws.

In addition, in high-speed electronic copying machines, the conveyance speed of transfer paper becomes extremely fast, and subtle differences in the coefficient of friction between transfer papers have a large effect on paper handling performance, making it necessary to feed multiple copies. In order to solve this problem, there was a need for a mechanism that could solve not only the structure of the paper handling mechanism but also the properties of the transfer paper.

The present invention aims to solve the above-mentioned problems when packaging with conventional moisture-proof wrapping paper, and its purpose is to prevent double feeding of transfer paper between machines. An object of the present invention is to provide a packaging material and a packaging method using the same.

Means for Solving the Problems The inventors of the present invention have improved the double feeding of transfer paper used in copying machines, printers, etc. from the perspective of packaging materials. By using a polyolefin film with an extraction amount below a certain value and using a composite sheet-like material with a sandwich structure in which sheet base materials are provided on both sides of the polyolefin film, transfer paper books wrapped from the polyolefin film can be produced. We discovered that fewer low-molecular weight substances transfer to the upper and lower surfaces, and that the problem of double feeding between devices does not occur when stacked books are unpacked, transfer paper books are stacked and placed in a paper tray. , we have completed the present invention.

The composite sheet material for transfer paper packaging of the present invention is composed of at least one selected from polypropylene, polyethylene, and ethylene-propylene copolymer, and is a polyolefin film with a low molecular weight extraction amount of 0.25% by weight or less by methanol. It is characterized by laminating sheet base materials on both sides. Furthermore, the packaging method of the present invention is characterized in that the composite sheet material described above is used to package transfer paper used in electrophotographic copying machines, printers, and the like.

FIGS. 1 and 2 show a cross-sectional view of one book of transfer paper packaged using the composite sheet material for packaging transfer paper of the present invention. In FIG. 1, polyolefin film 2
A transfer paper 5 is wrapped with a composite sheet 3 having a laminated structure on both sides of which sheet base materials 11 and 12 are welded. In addition, in FIG. 2, the polyolefin film 2
A transfer paper 5 is packaged in a composite sheet 3 having a laminated structure in which sheet base materials 11 and 12 are adhered to both sides with an adhesive 4.

In the present invention, the amount of low molecular weight extracted by methanol is
It means the value obtained by the following method.

0.2 to 1.0 g of a polyolefin film formed by melt extrusion is collected and immersed in methanol at room temperature for 3 hours. ) - 3 hours soaking - Memenoha, left hole diameter 1.0
Filter with a μm filter, evaporate methanol from the filtrate, measure the weight of the remaining extract, and determine the amount of low molecular extract using the following formula.

Amount of low molecular extraction (%) Weight of extract with methanol (g>=X100 Weight of polyolefin film (g) In the present invention, the sheet base material is not particularly limited, and may include, for example, paperboard, kraft paper, Papers such as high-quality paper and tissue paper can be used.When extrusion coating is performed on these sheet substrates, pretreatments used in normal extrusion coatings, such as anchor coating treatment and corona discharge treatment, are necessary. It is preferable to apply it accordingly.

The polyolefin film to be laminated with the sheet base material is composed of low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, or ethylene-propylene copolymer, or a mixture of two or more of these. It is something that Among these,
Polypropylene is most preferred, followed by ethylene-propylene copolymers.

In the present invention, these polyolefin films are required to have a low molecular extraction amount by methanol of 0.25% by weight or less. The amount of low-molecular-weight substances extracted from polyolefin films varies significantly depending on the type of solvent used for extraction and the extraction conditions, but as a result of the studies conducted by the present inventors, the phenomenon of double feeding between vessels was found to be It was found that there is a correlation with the amount of low molecular weight substances present. In other words, the amount of low molecular weight extracted by methanol is 0.
．． When the content is 25% by weight or less, the incidence of double feeding between containers is so small that it does not pose a practical problem.

In the present invention, the amount of low molecules extracted by methanol from a polyolefin film is determined by the type of polyolefin, density,
It varies depending on the melt viscosity, resin processing temperature, etc., but in any case, after melt extrusion, the content should be 0.25% by weight or less.

To obtain the composite sheet material for transfer paper packaging of the present invention,
The polyolefin film and the sheet substrate may be laminated by any method. For example, G? A composite sheet material may be formed by forming a polyolefin film on one side of a sheet base material by melt extrusion coating a polyolefin, and then laminating another sheet base material thereon. A composite sheet material may be formed by attaching sheet substrates to both sides of a polyolefin film. When laminating a polyolefin film on a sheet base material, a dry lamination method is generally suitable.

In addition, there are no particular restrictions on the adhesive used for bonding.
It is selected appropriately depending on the relationship between the sheet base material and the polyolefin film.

The composite sheet material for transfer paper packaging of the present invention is applicable not only to transfer paper used in printers, but also to transfer paper used in general electrophotographic copying machines, paper used in other devices that use cut paper, etc. The present invention can be applied to any type of paper, and can prevent double feeding from occurring at the paper feeding stage in any paper feeding device having any type of paper handling mechanism.

Function When the transfer paper is packaged with the composite sheet material for transfer paper packaging of the present invention, the top surface of the transfer paper at the top of the book of transfer paper and the bottom surface of the transfer paper at the bottom of the book are used for wrapping the transfer paper. Contact with composite sheet material.

However, in the present invention, less of the low molecular weight material from the polyolefin film is transferred to the transfer paper in contact with the composite sheet material, resulting in less variation in the coefficient of friction on the surface of the transfer paper. As a result, if you unwrap a stack of transfer paper volumes, stack multiple transfer paper volumes, and load them into the printer's paper tray of a copying machine to feed the paper, the top of the transfer paper volume The phenomenon that the transfer paper at the bottom of the book and the transfer paper at the bottom of the book are overlapped and fed will no longer occur.

Example Hereinafter, the present invention will be explained by examples.

Example 1 Polypropylene scraps with a melt viscosity of 30(]/10 minutes and a density of 0.90Q/c were melt-kneaded in an extruder, and the resin temperature was 270'.
After extrusion coating on a sheet substrate (unbleached kraft paper, 75(]/m ) at 310° C. to a film thickness of 20//fi, the sheet was coated on the extrusion coated polypropylene film side. A composite sheet material was created by laminating base materials (unbleached kraft paper, 75 g/m 2 ) by heat welding.

Example 2 Melt viscosity 3 g/10 min, density 0.924C1/cn
The low-odor grade low-density polyethylene of i is melt-kneaded in an extruder, and the resin temperature is 280'C1300°C1 and 3.
After extrusion coating the same sheet substrate as in Example 1 at 20'C to a film thickness of 2 CHtm, coat the same sheet substrate as in Example 1 on the extrusion coated low density polyethylene film side. A composite sheet material was created by laminating them by heat welding.

Example 3 Melt viscosity 21Q/10 min, density 0.900(]/H,
Melt and knead the ethylene-propylene copolymer using an extruder,
After extrusion coating to a film thickness of 20 μm on the same sheet substrate as in Example 1 at resin temperatures of 270°C, 1290°C, and 310°C, the extrusion-coated ethylene-propylene copolymer film side To,
The same sheet substrates as in Example 1 were laminated by heat welding to create a composite sheet material.

Example 4 Melt viscosity 10g/10min, density 0.924g/Cn;
Low-density polyethylene with a sharply improved molecular arch distribution is melt-kneaded in an extruder, and the resin temperature is 280'C1300.
'C1 and 320'C were extrusion coated on the same sheet substrate as in Example 1 to a film thickness of 20 JIIrI, and then the extrusion coated low density polyethylene film side was coated with the same punch as in Example 1. The sheet base materials were laminated by heat welding to create a composite sheet.

Example 5 Melt viscosity 4 g/10 min, density 0.924 (1/cm
The low-density polyethylene was melt-kneaded in an extruder and extrusion coated onto the same sheet base material as in Example 1 at a resin temperature of 320'C to a film thickness of 20 pm. A sheet base material similar to that in Example 1 was laminated on the polyethylene film side by heat welding to create a composite sheet material.

Example 6 Melt viscosity 4g/10min, density 0.924g/CIIt
A composite sheet material was prepared by melt-kneading low-density polyethylene in an extruder and extrusion coating the same sheet substrate as in Example 1 at a resin temperature of 320°C to a film thickness of 20 pm.

Regarding the composite sheet materials of Examples 1 to 6, the amount of low molecules extracted by methanol from the polyolefin film, the degree of reduction in the friction coefficient at the interface between containers, and the incidence of double feeding at the interface between containers were measured. The results are shown in Table 1.

In addition, each measurement condition is as follows.

1) The amount of low molecule extracted was measured by the method defined above.

2) Degree of decrease in friction coefficient at interface between containers (a> Measurement method of friction coefficient was carried out according to S-HD-1894-78. Transfer paper stacked using Tensilon Ij-H-I [IL tensile tester) Press a double-sided adhesive tape of 76#7?
Measured at IM/min.

(Measurement conditions: 20°C, 165% R) l) (b) Calculation method of reduction in friction coefficient at interface between containers Degree of reduction in friction coefficient at interface between containers = Friction coefficient before packaging - Friction coefficient after packaging Note that after packaging The coefficient of friction is determined by wrapping a book of transfer paper (A4) on the composite sheet base material on each side, storing it for one month with a load of 8 kg applied, and then opening the book. This is a value measured by stacking the transfer paper on top of the top transfer paper.

3) Incidence of double feeding at interface between containers After storing under the conditions described in 2) above, open the packaging, set two or more books stacked on top of each other in the paper feed tray of Zero Printer 100 (manufactured by Fuji Xerox VFJ), and then Feed the paper from the paper device using the feed roller, sort the paper using only the snapper mechanism, measure the occurrence of double feed at the interface between the containers during paper feeding, and calculate the incidence of double feed at the interface between the containers using the following formula. Ta.

Occurrence rate of double feeding at the interface between containers (%) Number of times double feeding occurs at the interface between the containers = X100
Number of interfaces between books The number of interfaces between books was 10 in all cases.

Table 1 can be done.

As is clear from Table 1, the amount of low molecules extracted by methanol from the polyolefin film of the composite sheet material is 0.
When the amount is 25% by weight or less, double feeding at the interface between containers will not occur even if the packaged transfer paper is opened and several copies are stacked and set on the paper feed tray.

Effects of the Invention Since the composite sheet material for packaging transfer paper of the present invention has the above-described structure, a book of transfer paper wrapped therewith can be opened and used as a paper feeder for an electrophotographic copying machine, a printer, etc. When a plurality of books are stacked and stored in a tray and fed, double feeding of transfer sheets at the interface between each tray is prevented.

Therefore, it is possible to reduce the occurrence of troubles in paper conveyance paths of electrophotographic copying machines, printers, and the like.

Furthermore, the transfer paper packaged according to the present invention can be used in electrophotographic copying machines, printers, etc. with a simplified paper handling mechanism structure, and
It also reduces the burden of paper handling compared to conventional paper handling mechanisms.

[Brief explanation of the drawing]

FIGS. 1 and 2 each show a cross-sectional view of a book of transfer paper wrapped with the sheet material for packaging transfer paper of the present invention. 11.12... Sheet base material, 2... Polyolefin film, 3... Composite sheet material, 4... Adhesive,
5...Transfer paper. Patent Applicant Fuji Xerox Co., Ltd. (1 person other than Fuji Xerox Co., Ltd.) Representative Patent Attorney Tsuyoshi Horabe Figure 1 Figure 2

Claims (2)

[Claims] (1) Polypropylene, polyethylene, and ethylene-
Consisting of at least one type selected from propylene copolymers, the amount of low molecular extraction by methanol is 0.25% by weight
A composite sheet material for transfer paper packaging, characterized by laminating a sheet base material on both sides of the following polyolefin film. (2) Polypropylene, polyethylene, and ethylene-
Consisting of at least one type selected from propylene copolymers, the amount of low molecular extraction by methanol is 0.25% by weight
A method for packaging transfer paper, comprising packaging the transfer paper using a composite sheet material formed by laminating sheet base materials on both sides of a polyolefin film as described below.