JPH04179976A - Laminate having excellent tearability and developer housing container - Google Patents

Abstract

PURPOSE:To allow the easily tearing of only the specified width of the laminate with light force by providing the laminate with a polyolefin flat yarn cloth having tearability in one direction. CONSTITUTION:The 2nd layer b laminated on a front layer a is constituted of the polyolefin flat yarn cloth having the tearability in either vertical or horizontal direction. More preferably the front layer a is constituted of a uniaxially stretched thermoplastic high-polymer film and a polyolefin hot melt adhesive material c is laminated to the polyolefin flat yarn cloth b. The lami nate is exactly teared by the small force in this way.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a laminate comprising at least a surface layer and a second layer laminated to the surface layer, and a laminate that is used in an electrophotographic copying machine or the like. This invention relates to a developer storage container that stores a developer.

[Prior Art] An electrophotographic apparatus or the like generally includes a developing section and a fixing section. The toner transferred onto the transfer material in the developing section is fixed by thermal melting in the fixing section.

As is well known, the developing section or developing device consists of a developing device section in which a developing roller, a developing sleeve, a developing layer thickness regulation blade, etc. are incorporated, and a developer storage container, and this container is connected to the developing device section through a bottom plate. are arranged integrally. A horizontally long slit opening is formed in the longitudinal direction of this bottom plate.
It communicates with the inside of the developing unit through this horizontally long slit opening. This horizontally elongated slit opening is sealed with a sealing member to block communication between the developer storage container and the developing unit, and the developer is maintained in a sealed state within the container, allowing for logistics and storage of the developing device. During the process, the developer is heated outside the device, prevented from scattering, and moisture-proofed.

When in use, the seal member is pulled out of the apparatus, the horizontally long slit opening is opened, and the opening is communicated with the developing unit. The sealing member is a flexible sealing member, and is easily bonded to the four peripheral edges of the horizontally long slit opening of the bottom plate by an adhesive means such as heat sealing (thermal welding), impulse seal high frequency welder, or the like.

[The problem to be solved by the invention] As mentioned above, the conventional developer container has the advantage that toner, that is, developer can be replenished by simply removing or tearing the sealing member, but the conventional sealing member had the following problems.

(1) A large amount of force is required to peel off the seal member at the adhesive portion.

(2) It is difficult to control the adhesive strength of so-called easy-peel adhesives, and if you try to reduce the peeling force, the adhesive strength will be insufficient and the sealing member will easily peel off during distribution, resulting in developer leakage.

(3) Due to scratches on the seal member or damage during adhesive processing, the seal member may be cut diagonally or torn when the seal member is peeled off.

(4) In order to adhere the sealing member, the width of the sealing member in the direction perpendicular to the molding direction of the opening must be wider than the opening, and when adhering to the developing device, the folded part may get caught or the adhesive or melt may In some cases, the sealing member may come into contact with the resin and become stuck, causing problems such as the sealing member not being able to be pulled out.

(5) Even if the sealing member is made of a material with directionality, such as uniaxially stretched polypropylene, or a material that has been half-cut to give directionality, and the direction in which it is easy to tear is aligned with the opening molding direction. It was not possible to obtain an opening with sufficient dimensional accuracy.

(6) Weld a second film (tear tape) with an easy-peel adhesive layer to the first film (cover film), which is narrower than the first film, and pull the edge of the second film to remove the second film. A method of tearing the first film according to the width has been devised and implemented, but this requires a process of welding the first film and the second film, which increases costs.

Therefore, an object of the present invention is to provide a sealing member that can be accurately torn with a small force or a laminate that can also be applied as a sealing member. It is an object of the present invention to provide a developer storage container that can be opened.

[Means for Solving the Problems] In order to achieve the above object, the invention relating to a laminate comprises at least a surface layer and a second layer laminated on the surface layer, the second layer comprising: Constructed from a polyolefin flat yarn cloth that has tearability in either the vertical or horizontal direction. Further, in the invention set forth in claim 2, the surface layer is composed of a uniaxially stretched thermoplastic polymer film, and the polyolefin flat yarn cloth in the invention set forth in claim 3 is laminated with a polyolefin hot melt adhesive. There is.

Further, the invention relating to a developer storage container according to claim 4 is comprised of a container main body in which the developer is stored, and a laminate having excellent tearability according to claim 3, wherein the container main body is The developer has an opening for discharging the developer, and the opening is configured to be sealed by the laminate according to claim 3.

That is, in the laminate according to the present invention, at least one layer thereof is composed of a polyolefin flat yarn cloth that can be torn in one direction, either vertically or horizontally. The surface layer is composed of a uniaxially stretched thermoplastic polymer film. In another invention, the surface in contact with the adherend is made of a polyolefin hot melt adhesive. By having a polyolefin flat yarn cloth in the intermediate layer, it is possible to open only a certain width.

The polyolefin flat yarn cloth described here is a plain weave of stretched polyolefin, and by changing the widths of the vertical and horizontal flat yarns, only the thinner side can be easily torn. Therefore, by keeping the longitudinal and lateral widths at predetermined widths, a certain opening can be obtained by tearing in the direction perpendicular to the thinner flat yarn.

However, it is more convenient to seal this flat yarn cloth with another resin so that it can be easily torn. Conventionally, flat yarn cloth has often been used as a base material for adhesive tapes, in which case it has been sealed with polyethylene or silicone resin. In the present invention, in order to apply a heat-sealable polyethylene hot-melt adhesive to a polyolefin flat yarn cloth and provide an easy beer function, it is possible to use the base material sealed with polyethylene or silicone resin as it is during heat-sealing. Its heat resistance is unmatched.

Therefore, by extruding and laminating a polyolefin hot-melt adhesive onto an unfilled polyolefin flat yarn cloth, we were able to provide an easy-peel function and a filling effect at the same time.

Furthermore, on the other side that is not extruded and laminated,
Uniaxially stretched polypropylene or polyethylene terephthalate films were dry laminated to obtain a heat-sealable laminate.

What is important at this time is the tearing direction of the polyolefin flat yarn cloth (direction perpendicular to the thin flat yarn).
The stretching direction of the film to be dry laminated must be aligned with the stretching direction of the dry laminated film.

On the other hand, the polyolefin hot melt adhesive used in the laminate of the present invention must adhere to the adherend with a strength higher than the tear strength of the laminate.

In addition, it is necessary to laminate to a thickness that does not significantly affect the tear strength of the laminate. The thickness at that time is about 20
~100 microns.

However, the tear strength of the polyolefin flat yarn cloth used in the present invention is 50 to 200 g, and the tear strength of the uniaxially stretched polypropylene or polyethylene terephthalate film is very light at 50 g or less. It is possible to choose hot melt adhesives.

[Example] Example 1 A polyolefin hot melt adhesive (EV
A content: 20%) C was extruded and laminated, and the base fabric was sealed at the same time.

Next, a uniaxially stretched polypropylene film (TOYOBO Pylene EM=1 (20 u) a) was attached to the other surface by dry lamination to obtain a 3-layer laminate.

Next, this laminate was cut to have a folded piece d as shown in FIG. 3, and a container e obtained by injection molding polyphenylene oxide (PPO) as shown in FIG.
It was heat-sealed to the flange part f.

After cooling down sufficiently, fold the tip back 180 degrees and speed up to 200.
A peel test was conducted at mm/min.

Example 2 A uniaxially stretched polyethylene terephthalate film 12u was dry laminated on the other side of the extrusion laminated base fabric in the same manner as in Example 1 to obtain a laminate consisting of three layers.

A test similar to Example 1 was conducted below.

Comparative Example 1 A polyolefin hot melt adhesive (EVA content 20
%) was extruded and laminated, this was cut into the shape shown in Fig. 3 in the same manner as in Example 1.2, and it was glued to the container shown in Fig. 4 to make a similar laminate. A test was conducted.

Comparative Example 2 Biaxially oriented polyethylene terephthalate film (12u
) and a nylon film (30u), and a polyolefin hot melt adhesive (EVA content 2
0%) was extruded and laminated to obtain a laminate. Then, a container e'' having an opening width of 60 mm as shown in FIG. 5 was heat-sealed using a seal head having a width of 20 mm at the leading end and trailing end.

Then I did the same test as the others.

The test results of the above Examples and Comparative Examples are shown in the table below.

Note that portions A, A', B, B', and C, C" correspond to the locations indicated by A, A', . . . in FIGS. 4 and 5.

As shown in the table above, according to this example, the peel strength is clearly different, so it is possible to accurately open the package with a small peeling force without causing diagonal cuts or tears.

[Effects of the Invention] As described above, since the laminate according to the present invention has a tearable polyolefin flat yarn cloth on one side, it can be easily drawn to a certain width with a light force. Moreover, the dimensional accuracy of tearing is extremely high.

Therefore, when this laminate is applied as a sealing material for a developer storage container, even if the developer discharge port is large, the laminate can be directly heat-sealed and the opening can be narrowed to a predetermined width.

In addition, according to the invention of the developer storage container, the laminate is laminated with a polyolefin hot melt adhesive, so the opening strength is less influenced by the heat seal pattern as in the past, and it can be opened smoothly. There is no need to worry about the contents leaking as a result of making the heat sealing conditions gentler.

Furthermore, since there is no need to weld two members such as the tear tape and the cover film, the process can be simplified.

Furthermore, the laminate according to the present invention uses a relatively inexpensive material such as polyolefin (polyethylene or polypropylene), so the cost is low.

[Brief explanation of drawings]

Figure 1 is a plan view showing an example of a polyolefin flat yarn cloth, Figure 2 is a cross-sectional view of the laminate, and Figure 3 is a perspective view of an example in which the laminate is adapted to a sealing member. 4 is a perspective view showing an embodiment of the developer storage container, and FIG. 5 is a perspective view of the developer storage container for comparison with this embodiment. a... Uniaxially extended polypropylene or polyester film b... Polyolefin (polyethylene) flat yarn cloth C... Polyolefin hot melt adhesive e...
Figure 1: 4 people making a developer storage container

Claims (1)

[Claims] 1 Consisting of at least a surface layer and a second layer laminated on the surface layer, the second layer is a polyolefin flat yarn cloth having tearability in either the vertical or horizontal direction. A laminate with excellent tearability. 2. A laminate with excellent tearability, wherein the surface layer according to claim 1 is a uniaxially stretched thermoplastic polymer film. 3. A laminate with excellent tearability, which is obtained by laminating the polyolefin flat yarn cloth according to claim 1 or 2 with a polyolefin hot melt adhesive. 4. Consisting of a container body in which a developer is stored, and a laminate with excellent tearability according to claim 3, the container body has an opening for discharging the developer stored therein. A developer storage container, wherein the opening is sealed by the laminate having excellent tearability.