JP2000095427A - Covered sponge tape manufacturing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a technique as wrapping a sponge tape in the covered tape without applying tension, in a system for manufacturing a covered sponge tape being composed of covering the sponge tape with the covered tape. SOLUTION: In this manufacturing system, it is provided with a reel driving part 50 rotating and driving a reel 42 wound with a sponge tape. When a first roller 31 draws in the sponge tape and a conductive cloth tape 14, the reel driving part 50 rotates the reel 42 so as to have the sponge tape delivered out of the reel 42 at almost the same speed as that the sponge tape is drawn into the first roller 31. With this, no tension is applied onto the sponge tape in space between two points P and Q, whereby the sponge tape is wrapped into the conductive cloth tape 14 in a natural state. Therefore, there is no fear of creases developing in the conductive cloth tape 14 caused by shrinkage in the tape after completion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a specific function (action) such as a sponge tape used as a sealing material for doors, windows, housings of equipment, etc. for soundproofing, air conditioning, shielding of electromagnetic waves and the like. The present invention relates to a sponge tape and an apparatus for manufacturing the same.

[0002]

2. Description of the Related Art In order to ensure soundproofing and air-conditioning retention, a sponge tape has been conventionally attached to a door, a window, an opening of a housing of a device, or the like. Conventionally used sponge tape is simply a sponge in a tape shape, or an adhesive tape (double-sided tape) attached to one side thereof so that the sponge tape can be attached to an arbitrary position. is there.

[0003]

In recent years, as mobile electronic devices such as mobile phones and mobile computers have become widespread,
The adverse effects of electromagnetic waves generated from them have become a social problem. Particularly in hospitals and the like, it has been confirmed that the electromagnetic waves generated by them cause malfunctions of medical devices and have serious effects.

For this reason, on the generating side of an electronic device or the like, an electromagnetic wave shielding material is attached or built into the inner surface of the housing or the inside of the housing wall to take measures to prevent the electromagnetic waves generated inside from leaking to the outside. However, since mobile phones and the like originally use radio waves, generation of electromagnetic waves cannot be completely suppressed.

Therefore, it is necessary to take measures to completely shield the harmful electromagnetic waves on the receiving side where the adverse effects of the electromagnetic waves are expected. Conventionally, an electromagnetic wave shielding room installed in a hospital or the like has a plate material for shielding electromagnetic waves built in or attached to a wall, a ceiling, a floor, a window, a door, or the like of the room, and the entire room is surrounded by a substance having electromagnetic wave shielding ability. Things.

As described above, the electromagnetic wave shielding material is also built in or attached to the movable members such as the door plate and the window glass. However, in order to further complete the shielding, the electromagnetic wave shielding material and the door frame and the window frame are required. The penetration of electromagnetic waves through the gap must also be prevented. Therefore, a door / window frame shielding material having an electromagnetic wave shielding ability is desired.

[0007] Conventionally, sponge tapes for door / window frame shields for the purpose of noise shielding and air-conditioning maintenance have been available. On the other hand, in order to have sufficient electromagnetic wave shielding ability, it is effective to cover it with an electromagnetic wave shielding sheet. However, if the sponge tape is to be coated with an electromagnetic wave shielding sheet by a high-speed automatic device for mass production, a light tensile force is applied to both raw materials.
Must be multiplied. However, since the sponge tape has a very high elasticity, the electromagnetic wave shielding sheet is covered in a state where the sponge tape is stretched. Become. This significantly impairs the commercial value in appearance and also has problems in shielding.

In view of the above problems, the applicant of the present application has
In Japanese Patent Application No. 9-230256, there has been proposed a method for producing a coated sponge tape, which comprises applying a non-stretchable tape to a sponge tape and covering the periphery with a coating sheet. As a result, it has become possible to efficiently produce high-quality coated sponge tape in large quantities.

In the above method, a non-stretchable tape is required in addition to the sponge tape and the covering sheet, and a separate step of preparing a composite tape formed by attaching the non-stretchable tape to the sponge tape is required. Therefore, there remains a problem that the manufacturing cost increases accordingly. The present invention has been made in order to solve such problems, and an object thereof is to provide a sponge tape in an apparatus for manufacturing a coated sponge tape formed by sticking a coating tape so as to wrap the sponge tape. It is an object of the present invention to provide a technique of wrapping a cover with a covering tape without applying tension.

[0010]

According to the present invention, there is provided an apparatus for producing a coated sponge tape, comprising: a reel for holding a sponge tape in a wound state; and a reel for holding the sponge tape in a wound state. A reel driving means for rotating the reel in a direction such that the sponge tape is fed from the reel, and a sponge tape fed from the reel and a separately supplied covering tape. The present invention is characterized in that a coating means for producing a coated sponge tape by attaching a tape is provided, and a speed at which the sponge tape is drawn out from the reel is substantially equal to a speed at which the sponge tape is drawn into the coating means.

When the coated sponge tape is used for shielding electromagnetic waves, a conductive sheet or a conductive cloth is used as the cover sheet. For the purpose of noise shielding, air conditioning maintenance, and the like, a simple plastic sheet, cloth, nonwoven fabric, or the like may be used.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a coated sponge tape manufacturing apparatus according to the present invention, a sponge tape before processing is held on a reel in a wound state. When the tip of the sponge tape (one end not wound on the reel) is pulled, the reel rotates and the wound sponge tape is unreeled from the reel. The sponge tape fed from the reel in this way is sent to the coating means together with the coating tape supplied from another reel. The covering means receives the two tapes and applies the covering tape to the sponge tape so as to wrap the side surface of the sponge tape while drawing the tapes in a predetermined direction.

In such a process, if the sponge tape fed from the reel is tensioned before reaching the covering means, the above-described problem occurs. Therefore, the apparatus according to the present invention is provided with reel driving means for rotating the reel in a direction such that the wound sponge tape is unreeled from the reel. The reel driving means rotates the reel in the above-described direction when the covering means draws the sponge tape. The speed at which the sponge tape is fed from the reel (supply speed) is set substantially equal to the speed at which the sponge tape is drawn by the coating means (processing speed). In this case, the tension applied to the sponge tape due to the inertia and friction of the reel is reduced. as a result,
The sponge tape is drawn into the covering means in a natural state without tension, and the above-mentioned problem does not occur.

As a form of the reel driving means, for example,
The reel may be directly rotated by a generally used motor. In this case, assuming that the rotation speed of the motor is constant, the tape supply speed gradually decreases as the diameter of the wound sponge tape decreases. Therefore, when using the reel driving means of this embodiment, it is preferable to provide a speed control means for controlling the rotation speed of the reel according to the diameter of the sponge tape wound up.

As another form of the reel driving means, there is a relay means for pulling out the sponge tape from the reel at a predetermined speed and sending it to the coating means. The relay means is configured to, for example, hold the sponge tape drawn out of the reel between a pair of rollers and rotate the rollers inward to feed the sponge tape from one side to the other side.
In this embodiment, the reel is driven to rotate by the tension by which the relay means pulls out the sponge tape. The distance between the relay means and the covering means is adjusted in advance so that the sponge tape is transferred in a natural state without tension.

The operation of paying out the sponge tape from the reel may be continuous or intermittent. When the feeding operation is intermittent, the supply speed is regarded as the time average of the amount (length) of the sponge tape being fed from the reel, and the feeding speed is made substantially equal to the processing speed. Further, even when the feeding operation is performed continuously, the supply speed does not necessarily have to be constant, as long as the condition that the time average of the supply speed is substantially equal to the processing speed is satisfied.
The supply speed may be appropriately changed.

In general, sponge tapes generally have a rectangular cross section. In this case, simply covering the cover sheet may cause the inside sponge to be soft and the corners to be rounded. If the covering sponge tape is used as a sealing material for a gap in a door or the like in such a state, when the covering sponge tape is pressed, both side surfaces bulge outward as shown in FIG. Electromagnetic waves leak from the part.

Therefore, in an apparatus for manufacturing a coated sponge tape using a sponge tape having a rectangular cross-sectional shape, the coating sponge tape formed by the coating means is pressed while substantially holding the center of a pair of opposed two side surfaces of the pair. By pressing the other two opposing side surfaces entirely, the first pair of 2
A fold forming means for forming a fold on the side surface may be provided. In this way, an inward fold is provided in the longitudinal direction at substantially the center of both sides, so that even when the coated sponge tape is pressed from both sides, both sides bulge as shown in FIG. Instead, it penetrates inside, preventing leakage of electromagnetic waves. In addition, since clear folds are also provided at the ridge lines at the four corners, the cross section becomes a clear rectangular shape as a whole.

[0019]

According to the coated sponge tape manufacturing apparatus of the present invention, a beautiful coated sponge tape can be efficiently manufactured without wrinkles on the surface coated sheet.

When a sponge tape having a rectangular cross section is used, a fold in the longitudinal direction is provided at a substantially central portion on both side surfaces by using a fold forming means as described in the latter half, so that the tape is pressed from both sides. Sometimes, as shown in FIG. 4 (a), both side surfaces do not swell and come into the inside,
Electromagnetic waves are prevented from leaking. In addition, clear folds are given to the ridge lines at the four corners, and the coated sponge tape has a clear rectangular shape in cross section as a whole. It also has the effect that it can be done.

As can be understood from the above description,
Since the gist of the present invention is that a sponge tape having high elasticity is beautifully coated, the coating sheet is not limited to a conductive sheet or a sheet having an electromagnetic wave shielding ability, and may be any coated sheet.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A coated sponge tape manufacturing apparatus according to an embodiment of the present invention will be described with reference to FIG. The apparatus of this embodiment is an apparatus for manufacturing an electromagnetic wave shielding sponge tape 10 in which a sponge tape 11 is covered with a conductive cloth tape 14. Hereinafter, the general configuration and operation of this device will be described.

In this device, the sponge tape 11 is held on the reel 42 in a wound state.
A commercially available sponge tape can be used as the sponge tape 11. However, if there is no suitable commercially available sponge tape, a wide sponge sheet can be cut into a desired width by a slitter. Here, a rectangular cross section is used temporarily (FIG. 2A), but the shape and size are appropriately set according to the purpose of use.

On another reel 41, the conductive cloth tape 14
Is held in a wound state. Since the conductive cloth is rarely commercially available in the form of a tape, it is cut into a predetermined width from a long wide material by a slitter. The width is defined as the peripheral length of the sponge tape + α. α is the length of the overlapping portion on both sides, and is set to about 1 mm to several mm. As the conductive cloth, for example, a cloth obtained by impregnating a woven polyester cloth with a copper (Cu) solution for imparting conductivity can be used.
In addition, since copper is easily oxidized in the air and discolored and deteriorated, it is desirable to further impregnate a nickel (Ni) solution in order to prevent the discoloration and deterioration.

The process of forming the electromagnetic wave shielding sponge tape 10 from the sponge tape 11 and the conductive cloth tape 14 will be described with reference to FIGS. First, the sponge tape 11 drawn from the reel 42 is superimposed on the conductive cloth tape 14 drawn from the reel 41, and the positions of the sponge tapes 11 and 14 are adjusted by the first roller 31 (FIG. 2A). ). Next, the sponge tape 11 is covered with the conductive cloth tape 14 in a folder 32 (composed of a front folder 32a and a rear folder 32b) made of a steel wire having a smooth surface. That is, while both tapes advance in the folder 32 to the left in FIG. 1, firstly, both ends of the conductive cloth tape 14 are lifted by the front folder 32a (FIG. 2B), and then the rear folder 32b is moved. It is overlaid on the upper surface of the sponge tape 11 (FIG. 2C).

The tape obtained by coating the sponge tape 11 with the conductive cloth tape 14 as described above immediately enters the heater section 33 and is heated by the vertical and horizontal rollers maintained at a high temperature. As a result, the hot melt applied to the inner surface of the conductive cloth tape 14 is melted, and the sponge tape 11 and the conductive cloth tape 14 are adhered. Finally, the double-sided adhesive tape 15 pulled out from the reel 43 is attached to the upper surface of the tape by the second roller 34 (FIG. 2).
(D)). In addition, the upper surface of the double-sided adhesive tape 15 is left with the release paper stuck. Thus, a long sponge tape (electromagnetic wave shielding sponge tape) 10 whose periphery is covered with the conductive cloth is completed. The completed electromagnetic wave shielding sponge tape 10 may be wound on a reel, or may be immediately cut to a desired length by a cutter using the present apparatus.

When the completed electromagnetic wave shielding sponge tape 10 is used, the release paper on the upper surface of the double-sided adhesive tape 15 is peeled off, and the electromagnetic wave shielding sponge tape 10 is attached to a door frame, an opening edge of an electronic device, or the like.

The electromagnetic wave shielding sponge tape 10 is used not only as a building material for an electromagnetic wave shielding room as described above, but also as a sealing material for preventing leakage of electromagnetic waves from an opening of a housing of an electronic device. In this application, in particular, if conductive lint is generated from the electromagnetic wave shielding sponge tape 10, it may adhere to an internal electronic circuit and cause an electrical failure such as a short circuit. Therefore, when slitting the conductive cloth, it is preferable that the conductive cloth is impregnated with a hot melt solvent in advance, and then slit with a heat slitter.
This prevents the generation of lint or the like during slitting and subsequent use.

The sponge tape 11 is used in the apparatus of this embodiment.
Is provided with a reel driving unit 50 for rotationally driving the reel 42 holding the. The reel drive unit 50 includes a reel 4
2 and a circuit (not shown) for controlling the energization of the motor. When the sponge tape 11 is pulled out from the reel 42 as described above, the reel driving unit 50 rotates the reel 42 clockwise in FIG. At this time, the rotation speed of the reel 42 is determined between the point at which the sponge tape 11 is fed from the reel 42 (point P) and the point at which the sponge tape 11 is drawn into the first roller 31 (point Q). The sponge tape 11 is adjusted so as not to apply an excessive tension. To do so, for example, the sponge tape 1 is pulled from the reel 42 at substantially the same speed as or slightly higher than the speed at which the sponge tape 11 is drawn into the first roller 31.
The speed of the reel 42 may be adjusted so that 1 is always fed. In this case, the speed at which the sponge tape 11 is drawn into the first roller 31 may be determined, for example, by always keeping the rotation speed of the first roller 31 at a predetermined value and from the value and the diameter of the first roller 31. .

In the above-described apparatus, the sponge tape 11 and the conductive cloth tape 14 immediately after leaving the heater section 33 are not stable due to high temperatures. The tape may warp or wrinkle on its surface (conductive cloth tape 14) as the shrinkage progresses. Therefore, in the apparatus of the present embodiment, the fan 45 is disposed at the subsequent stage of the heater section 33. The sponge tape 11 and the conductive cloth tape 14 shrink rapidly due to the air cooling by the fan 45,
Its shape becomes stable. If the double-sided adhesive tape 15 is adhered after the shape is stabilized in this way, wrinkles and warpage of the tape do not occur. Note that it is desirable to ensure a sufficient distance between the heater unit 33 and the second roller 34 in order to further sufficiently contract the contraction.

In the above-described apparatus, when the sponge tape 11 has a rectangular cross-sectional shape, if the periphery thereof is covered with the conductive cloth tape 14, the sponge inside may be soft, and as shown in FIGS. 2 (c) and 2 (d). The corners are rounded as shown. In such a state, as described above, FIG.
When pressed in such a manner, both side surfaces bulge outward. Therefore, in the apparatus of the present embodiment, the tape 2
The thin disk 35 (the disk on the opposite side is not visible in FIG. 1) and the pressing rollers 36a and 36b for pressing the other two opposite side surfaces of the tape are arranged so as to horizontally press the substantially center of the side surface. A groove forming portion 37 is provided. FIG. 3 is a perspective view showing the configuration of the groove forming portion 37. In this groove forming portion 37, as shown in FIG. 3A, the tape is pressed from above and below by rollers 36a and 36b, and both sides of the tape are substantially pressed by a disk 35 (the opposite disk 35 is not visible). An inward fold 16 is provided in the longitudinal direction of the central portion. As a result, both sides enter into the inside as shown in FIG. 4A when pressed, and leakage of the electromagnetic wave is prevented. Also, clear folds are provided on the four ridge lines of the corners, and the cross section of the electromagnetic wave shielding sponge tape 10 becomes a clear rectangle.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a coated sponge tape manufacturing apparatus according to one embodiment of the present invention.

FIG. 2 is a view showing a procedure for manufacturing a coated sponge tape by the apparatus according to the present invention.

FIG. 3 is a view showing a configuration of a groove forming portion for forming an inward fold in a longitudinal direction of a substantially central portion on both side surfaces of the covering sponge tape.

FIG. 4 is an explanatory view showing an effect of an inward fold in a longitudinal direction of a substantially central portion on both side surfaces.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Electromagnetic wave shielding (conductive cloth covering) sponge tape 11 ... Sponge tape 14 ... Conductive cloth tape 15 ... Double-sided adhesive tape 16 ... Inward fold in the longitudinal direction of the approximate center of both sides 35 ... Center side holding disc 36a, 36b: pressing roller 32: conductive cloth tape folder 33: heater section 37: groove forming section 41, 42: reel 45: cooling section 50: reel driving section

Claims (4)

[Claims] A reel for holding the sponge tape in a wound state; a reel driving means for rotating and driving the reel in a direction such that the wound sponge tape is unreeled from the reel;
And a covering means for receiving a sponge tape fed out from a reel and a separately supplied covering tape, and applying a covering tape so as to wrap the sponge tape while pulling the two tapes in a predetermined direction. An apparatus for producing a coated sponge tape, wherein the speed at which the sponge tape is unwound from the reel is substantially equal to the speed at which the sponge tape is drawn into the coating means. 2. The apparatus according to claim 1, wherein a sponge tape having a rectangular cross section is used while holding substantially the center of a pair of two opposite side surfaces of the coated sponge tape created by the coating means. An apparatus for producing a coated sponge tape, comprising: a fold forming means for forming a fold on the first pair of two side faces by entirely pressing the two opposite side faces of the tape. 3. A heating means for melting a hot melt applied to the inner surface of the covering tape attached to the sponge tape and attaching the covering tape to the sponge tape at a stage subsequent to the covering means. The coated sponge tape manufacturing apparatus according to claim 1 or 2, further comprising: 4. The coated sponge tape manufacturing apparatus according to claim 3, further comprising cooling means for cooling the coated sponge tape heated by the heating means at a stage subsequent to the heating means.