JPH01176309A - Cleaning tape - Google Patents

Abstract

PURPOSE:To increase a sliding and connecting area to a magnetic head and to effectively clean up wear particle, which is generated when a coat-type magnetic tape is traveled, by specifying the whole thickness and Young's modulus of a cleaning tape, which forms a cleaning layer on a non-magnetic supporting body. CONSTITUTION:The cleaning tape is constituted by forming a cleaning layer 2 on a non-magnetic supporting body 1. In such a case, when the whole thickness of the cleaning tape is obtained as T and the Young's modulus is obtained as E, the condition of T<=10mum, E<=900kg/mm<2> and ET<3=8X10<5>mum.kg/mm<2> is satisfied. Namely, the whole thickness T and Young's modulus E are satisfied and stiffness ET<3>, which goes to be a barometer for a so-called stiffness, is suppressed. Thus, a practical area, in which the cleaning tape is slided and connected to the magnetic tape, goes to be large and the wear particle, which is generated when the coat-type magnetic tape is traveled, can be effectively cleaned up.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a cleaning tape used for cleaning a magnetic head or pinch roller of, for example, a video tape recorder.

<Summary of the Invention> The present invention makes it possible to increase the sliding contact area with the magnetic head and enhance the cleaning effect by specifying the total thickness and Young's modulus of a cleaning tape in which a cleaning layer is formed on a non-magnetic support. This is an attempt to provide a leaning tape.

<Prior Art> Magnetic tape, which is a recording and reproducing medium used in magnetic recording and reproducing devices such as audio cassette tape recorders and video tape recorders, can be divided into vapor-deposited magnetic tape and coated magnetic tape. However, usually a mixture of the various magnetic tapes mentioned above is used.

By the way, when the above-mentioned coated magnetic tape is run in a magnetic recording/reproducing device, the magnetic powder contained in the magnetic layer of the coated magnetic tape is abraded to the magnetic head or pinch roller of the magnetic recording/reproducing device. There is a phenomenon in which wear particles adhere to surfaces such as the like.

If a vapor-deposited tape is run with such abrasion particles still attached to the magnetic head, the magnetic particles attached to the magnetic head will cause instantaneous hendoklong or dropout, and the playback of the magnetic tape will be interrupted. It becomes a big problem when

Conventionally, in order to solve the above-mentioned problems, cleaning tapes have been used to clean the magnetic heads and pinch rollers of magnetic recording devices.

<Problems to be Solved by the Invention> However, the cleaning tapes conventionally used as described above do not have sufficient cleaning effects, and dropouts and instantaneous black puffer problems have not yet been solved.

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned conventional problems, and provides a cleaning tape that can effectively clean abrasion particles generated when a coated magnetic tape is run. The purpose is to

Means for Solving the Problems> In order to achieve the above object, the present invention provides a cleaning tape in which a cleaning layer is formed on a non-magnetic support, where the total thickness of the cleaning tape is T and the Young's modulus is E.
When T≦10μm.

E≦900kg/mm, ET”≦8X10Sμm・kg
/ m rd.

The cleaning tape, as shown in FIG. 1, has a cleaning layer (2) formed on a non-magnetic support (1).

Here, the non-magnetic support (1) may be any material that is normally used as a base for this type of tape (for example, polyimide, polyamide, polyethylene terephthalate, etc.). - (PET) film etc. can be used.

The cleaning layer (2) is provided to clean abrasion powder adhering to the magnetic head, and may be formed by coating a mixture of magnetic powder in a binder. It may be formed by vapor deposition using a metal thin film as a vapor deposition layer.

When the cleaning layer (2) is formed by coating the non-magnetic support (1) as a cleaning agent paint containing magnetic powder mixed in a binder, the magnetic powder may include:
For example, materials that are mainly composed of CO-adhered r-Fe203 and to which a predetermined amount of inorganic pigment such as carbon is added, or materials that are normally used for this type of coating type cleaning can be used, and as a binder, for example, General-purpose resins such as urethane resins and nitro resins can be used.

On the other hand, when forming the cleaning layer (2) by vapor deposition, the gold mud thin film is made of, for example, Co-Ni or a fully bendable material that is not very hard and can be vapor deposited, which is usually used as the cleaning layer material of this type of vapor-deposited cleaning tape. is available.

In addition, the cleaning layer (2) and the non-magnetic support (
An underground layer may be provided between 1) in order to control the surface roughness of the cleaning layer (2), and an inorganic pigment such as 5iOz can be used as the underground layer.

In addition, 'KA?' is applied on the cleaning layer (2) in order to improve the running properties and durability of the cleaning tape. e
It is preferable that the T agent is top coated.

As this lubricant, it is preferable to use a fluorine-based lubricant, but the lubricant is not necessarily limited thereto.

Furthermore, in the case of a vapor-deposited cleaning tape, a back coat layer may be provided for the purpose of improving runnability and durability. As the back coat layer, any material that is normally used as a bank coat layer material for this type of tape can be used.

In the present invention, such a cleaning tape is further required to satisfy the following predetermined relationship, where T is the total thickness of the cleaning tape and E is Young's modulus.

That is, the total thickness T of the cleaning tape is T≦10μ.
m......(1) and Young's modulus E is E≦900kg/mn? -・(21, and the total thickness T and Young's modulus E are ET3≦8×105p mkg/mrd・
・−・−・・(3) must be satisfied.

In addition, all of the cleaning tapes mentioned above are II! The upper limit of jET must be set to T≦10 μm as described above, but the lower limit is determined based on manufacturing issues. Further, ET3 is generally used to indicate the stiffness of a tape.

Each of the above constituent requirements is required from the necessity of effectively demonstrating the cleaning effect of the cleaning layer,
This has also been confirmed through experiments conducted by the present inventors. That is,
The lower the total ffT and Young's modulus E values of the cleaning tape, the lower the stiffness (ET3), which is an index of stiffness, and the better the cleaning tape because the effective area for the magnetic head to be cleaned increases. Close contact is achieved, and magnetic powder can be effectively removed.

Note that the cleaning tape may be set as follows in relation to a magnetic tape used in a magnetic recording/reproducing device such as a video tape recorder.

That is, the total thickness of the magnetic tape used is Tn.

When the total thickness of the cleaning tape is Tc, 2T blue≧
Tc (41) Preferably, Tc on Ti (5) is set.

This is a cleaning tape that satisfies all the conditions of each formula (1) to (3) above, and the total thickness and Young's modulus of the coated magnetic tape used are lower than those of the above cleaning tape. In some cases, powder falls on the magnetic head over a wide range, and even if cleaning is performed after running the coated magnetic tape, the abrasion powder cannot be sufficiently removed.

Therefore, by setting the total thickness of the cleaning tape as a relative relationship with the total thickness of the magnetic tape used so as to satisfy the conditions of each formula (4) or (5) above,
- The layer cleaning effect can be improved.

Effect〉.

In the cleaning tape according to the present invention, its total thickness and Young's modulus are defined, and the stiffness, which is an index of so-called stiffness, is suppressed, so the effective area where the cleaning tape comes into sliding contact with the magnetic head is increased. , abrasion powder generated when a coated magnetic tape is run is effectively cleaned.

<Examples> Hereinafter, specific examples of cleaning tapes to which the present invention is applied will be described.

The cleaning tape used in this example uses a 7 μm thick polyethylene terephthalate film as a non-magnetic support, with a binder made of 70 parts by weight of urethane resin and 30 parts by weight of nitro resin on top of the film. A cleaning paint containing 90 parts by weight of Co-coated Fe203 as a magnetic powder, 10 m parts of an inorganic pigment, and 10 PHR of a hardening agent per 100 parts of the binder was added in an amount of 3 μm rg.
,,that is, the total thickness is 10I10l1! It can be obtained by coating it so that . The Young's modulus of this coating type cleaning tape is 500 kg/
M n? Met. The following measurements were performed using the cleaning tape having the above configuration.

Commercially available coated 8mm magnetic tape (P6-12
After running five volumes of 0) on an 8 mm VTR, the coated cleaning tape having the above structure was run in recording mode for 15 seconds. Thereafter, the vapor-deposited magnetic tape was run for recording and reproduction, and the amount of dropout during the initial 5 minutes of reproduction was measured. In addition, the above-mentioned vapor deposition type magnetic tape is c080-N
It is formed by diagonally depositing i2°, and the magnetic layer is formed so that the total thickness of the magnetic tape is 10 μm, and the surface of the magnetic layer is coated with a Q't% agent. and Young's modulus is 600 kg/m ra.

11 dishes 1 The Young's modulus of the cleaning tape used in Example 1 was 6
The amount of dropout during the initial 5 minutes of reproduction was measured in the same manner as in Example 1, except that QQ kg/mm and a total thickness of 10 μm were used.

The Young's modulus of the cleaning tape used in Example 1 was 7.
00 ktr/mm, and the total thickness was changed to 10 μm, but the dropout amount during the initial 5 minutes of reproduction was measured in the same manner as in Example 1 above, except for the other conditions.

The cleaning tape used in this example was a polyethylene terephthalate film with a thickness of 8.8 μm bound to a non-magnetic support, and one side of the tape was coated with Cogo-N1z as a cleaning layer.

was deposited on the other side to a thickness of 0.2 μm, and on the other side, a back coat layer of paint made of urethane resin with carbon added was applied to a thickness of 1.0 μm, that is, the total thickness was 10 μm.
It can be obtained by forming it so that it becomes m. Note that a fluorine-based lubricant is coated on the cleaning layer as a lubricant layer.

In addition, the Young's modulus of this vapor-deposited cleaning tape is 60.
0 kg/mrrl.

The following measurements were performed using the cleaning tape having the above configuration.

Commercially available coated 8mm magnetic tape (P6-12
0) was run on a 5@8 mm VTR, and then the coated cleaning tape having the above configuration was run in recording mode for 15 seconds. Thereafter, the vapor-deposited magnetic tape was run for recording and reproduction, and the amount of dropout during the initial 5 minutes of reproduction was measured.

The Young's modulus of the cleaning tape used in Example 4 was 6.
Dropout ffi during the initial 5 minutes of reproduction was measured in the same manner as in Example 4 except that the weight was 30 kg/m'm and the total thickness was 8 μm.

Jijitanko The Young's modulus of the cleaning tape used in Example 4 was 7.
The amount of dropout during the initial 5 minutes of reproduction was measured in the same manner as in Example 4, except that 00 k, g/mrd, and total thickness were changed to 8 μm.

In addition, the present inventors measured the number of dropouts under the conditions of the comparative example described below in order to compare the amount of dropouts under the conditions described in Examples 1 to 6 above.

Kitamoto 10 - Young's modulus of the cleaning tape used in Example 1 was 5
00kg/mn? The dropout Et during the initial 5 minutes of reproduction was measured in the same manner as in Example 1 except that the total thickness was changed to 15 μm.

On this side, the Young's modulus of the cleaning tape used in Example 1 was 1.
The amount of dropout during the initial 5 minutes of reproduction was measured in the same manner as in Example 1, except that the weight was 200 kg/mrrr and the total thickness was 10 um.

The amount of dropout during the initial 5 minutes of playback was measured when a vapor-deposited magnetic tape was recorded and played back using an unused VTR. In addition, in the vapor-deposited magnetic tape, the nonmagnetic support has a Young's modulus of 600 kg/mm,
Cog, (1-Ni2g is obliquely deposited to form a magnetic layer such that the total thickness of the magnetic tape is 10 μm,
A lubricant is applied to the surface of the magnetic layer.

The amount of dropout during the initial 5 minutes of playback was measured when a vacuum-deposited magnetic tape was run for 5 minutes for recording and playback without running a cleaning tape after running 5 rolls of a pot-coating type magnetic tape. .

Table 1 shows the measurement results for each dropout described above.

Table 1 In Table 1 above, the dropout amount determined by Example 1 to Example 6 to which the present invention is applied and the dropout amount measured by Comparative Example 1 and Comparative Example 2 to which the present invention is not applied. As is clear from the comparison,
If a magnetic recording/reproducing device is run using the cleaning tape according to the present invention, the dropout will be reduced to about 1/4 (in relation to Comparative Example 1) or about 1/3 in relation to Comparative Example 2.
can be suppressed to

Furthermore, as is clear from comparing the dropout amount of the cleaning tape to which the present invention is applied with the dropout ffl shown in Reference Example 2 (when the cleaning tape is not run), it is clear that By doing so, the amount of dropout can be reduced to approximately one-fifth.

Further, when comparing the dropout amount of Examples 1 to 6 and the dropout amount of Reference Example 1 (when the magnetic tape is run by an unused VTR), there is not much difference.

In other words, if a cleaning tape to which the present invention is applied is run after running a coating-type magnetic tape, the vapor-deposited magnetic tape that is run after this will suffer from wear caused by the running of the coated-type magnetic tape. It can be seen that the powder is removed and therefore the amount of dropout is reduced. Furthermore, this dropout amount is equal to the amount of unused VT
It can be seen that the amount of dropout is comparable to that when a vapor-deposited magnetic tape is run on R.

<Effects of the Invention> Since the cleaning tape according to the present invention is very soft, the surface area of the cleaning tape in sliding contact with the magnetic head is large, and the abrasion powder generated when a coated magnetic tape is run is reduced. Can be cleaned effectively.

Therefore, it is possible to provide a leaning tape that can prevent the occurrence of instantaneous hesode long or dropout due to the influence of magnetic powder adhering to the head.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of a main part showing an example of the structure of a cleaning tape to which the present invention is applied. 1...Non-magnetic support 2...Cleaning layer patent Applicant: Sony Corporation Figure 1 Procedural Amendment (April 12, 1988, own ship Kunio Ogawa, Commissioner of the Patent Office 1, Case) Indication 1988 Patent Application No. 335320 Address 6-7-35, Kitashinyo, Tokyo Parts Ward Name (218) Sony Corporation Representative Norio Ohga 4, "Claims" and "Invention" in the attorney's specification Detailed explanation of
Each column 7, Contents of amendment (1) The claims of the specification are amended as shown in the attached sheet. (2) The statement "Young's modulus is E" in the fourth line of page 4 of the same book is corrected to "Young's modulus in the running direction (MD force direction is E"). (3) Same book, page 4, line 5 rE from line 6 to line 6
T3≦8×105um-kg/mn? The description that says J is rET3≦8 X 105 (74m) 3・kg/m
Correct it with mJ. (4) The statement "Young's modulus E" on page 6, line 18 of the same book is corrected to "Young's modulus in the running direction (MD force direction is E"). (5) Same book, page 7, line 2 rET3≦8X L 054m-kg/mmj in the eye rET3≦8X 105 (μm) 3・kg/m
Correct it to mJ. (6) In the same book, page 8, line 4, the statement “r2Tn≧Tc... (4)” was changed to “rTr+ ≧2/3Tc...”
(4)”. (7) In the same book, page 10, line 4 and 17, the description "Young's modulus" is corrected to "Young's modulus in the running direction." (8) In the same book, from page 10, line 20 to page 11, line 1, the description "Young's modulus" is corrected to "Young's modulus in the running direction." (9) In the same book, page 11, lines 6 to 7, ``
The description "Young's modulus" is corrected to "Young's modulus in the running direction." αω Same book, page 12, line 2 and line 14 to 1
The "Young's modulus" written over the fifth line is corrected to "Young's modulus in the running direction." αυ Same book, from page 12, line 20 to page 13, line 1, from page 13, line 11 to line 12, and further from line 17 to line 18. The "Young's modulus" that is calculated is corrected to the "Young's modulus in the running direction." (2) In the same book, on page 14, line 7, the description "Young's modulus" is corrected to "Young's modulus in the running direction." The scope of the appended patent claims is as follows: In the cleaning LL-b in which a cleaning layer is formed on a non-magnetic support, where T is the total thickness of the cleaning tape and E is the left and vertical Young's modulus of the main hill, T≦10 μm E ≦900 kg/mm

Claims (1)

[Claims] In a cleaning tape in which a cleaning layer is formed on a non-magnetic support, where T is the total thickness of the cleaning tape and E is Young's modulus, T≦10 μm E≦900 kg/mm^2 ET A cleaning tape characterized by satisfying ^3≦8×10^5μm・kg/mm^2.