JP2698053B2 - Film deposition equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft material such as a disposable diaper and an apparatus for producing a film which is embossed to give a soft touch.

[0002]

2. Description of the Related Art It is necessary that a film, such as a disposable diaper, which comes into direct contact with human skin is soft and does not feel cold upon contact. For this reason, in general, polyethylene softened by mixing calcium carbonate is used, and it is considered that the surface is embossed to prevent cold so that it does not completely adhere to the skin. .

[0003] An apparatus for producing such a soft film is also
There is no change in using a film forming apparatus using the T-die 1 or the like generally used in the related art. In this case, the surface of the cooling roll 2 is embossed in advance, and the pressure roll 3
In general, a process is performed in which a soft smooth film 4 is pressed against the embossed surface of the cooling roll 2 to form an embossed film 5 due to the elasticity of the silicon rubber layer 3a on the surface of the film.

[0004]

However, the pressure roll 3 applies the soft smooth film 4 to the cooling roll 2.
In order to press against the embossed surface, the surface is a silicon rubber layer 3a. While the inner surface of the pressure roll 3 is water-cooled, a plurality of touch-type cooling rolls 7 are further provided on the outer surface. The surface of the layer 3a cannot be completely cooled. For this reason, the surface of the silicon rubber layer 3a is brought into a high temperature state due to the heat of the supplied high temperature smooth film 4.

When the cooling roll 2 and the pressure roll 3 are rotated in such a state, the smooth film 4 pressed at the contact point P becomes an embossed film 5, but is easily separated from the cooling roll 2 having a rough surface. It is difficult to separate from the surface of the pressure roll 3 which has a high temperature on the smooth surface, and easily gets caught in the pressure roll 3 side.

In order to prevent such entanglement, it is impossible to strongly pull the embossed film 5 because it is a soft film, and there is a risk of cutting. Therefore,
In order to prevent the above-mentioned entrapment, the operation has been performed by a method in which the film forming speed is reduced and the film is formed slowly.

For this reason, it is impossible to increase the production amount by one film forming apparatus, and it is difficult to reduce the cost. An object of the present invention is to provide a film forming apparatus capable of increasing the production amount while preventing the above-described entanglement.

[0008]

In order to achieve the above object, a cooling roll 2 embossed on the surface of a smooth film 4 of a soft material extruded from a T-die 1 and a pressure roll 3 having a smooth surface are used. In a film forming apparatus in which the embossing process is performed at the contact point P to form the embossed film 5, the embossed film 5 that has been embossed after passing through the contact point is prevented from adhering to the surface of the pressure roll 3 having a smooth surface. Contact point P
Is provided with a peeling device 6 below.

The peeling device 6 is provided with a peeling roll 6a in contact with the surface of the cooling roll 2 near the contact point P,
An air knife that drives the peeling roll 6a to have the same peripheral speed as the cooling roll 2 and an air knife that ejects a thin plate-shaped air jet toward the contact point P along the surface of the pressure roll 3. 6b and those using both.

[0010]

As described above, the peeling roll 6a prevents the embossed film 5 from being largely separated from the cooling roll 2, and the embossed film 5 adhered to the pressure roll 3 by the air jet of the air knife 6b.
, And the silicon rubber layer 3a on the surface of the pressure roll 3 is air-cooled by an air jet, so that the embossed film 5 hardly adheres to the silicon rubber layer 3a.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a film forming apparatus according to the present invention.
Is a configuration diagram of a main part, (b) is an enlarged explanatory view of a contact point portion between a cooling roll and a pressure roll, and FIG. 2 is a configuration diagram of an air knife.

The soft material of the embossed film 5 which is the object of the present invention is a polyethylene containing calcium carbonate which has been conventionally used. Therefore, although the film itself has a low tensile strength, it is in contact with human skin. In this case, a soft touch is easily obtained.

The molten resin of the soft material is extruded from the T-die 1 to form a smooth film 4. In order to emboss the smooth film 4, a cooling roll 2 having an embossed surface and a pressure roll 3 having a smooth surface are provided. At the contact point P, the smooth film 4 is embossed to form an embossed film 5.

The surface of the pressure roll 3 is formed of a silicone rubber layer 3a in order to press the smooth film 4 in a high temperature state onto the uneven surface (embossed surface) of the cooling roll 2 having an uneven surface to conform to the embossed surface. It has elasticity. In addition, since the pressure roll 3 is always in contact with the smooth film 4 in a high temperature state, it is water-cooled from the inside, but the silicon rubber layer 3a on the surface has poor heat conduction and is hard to cool to the surface.

For this reason, the embossed film 5 which has been embossed after passing through the contact point is easy to pass while adhering to the surface of the pressure roll 3 having a smooth surface. 6 is provided.

One configuration of the peeling device 6 is provided with a peeling roll 6a in contact with the surface of the cooling roll 2 near the contact point P. The peeling roll 6a is driven by a method such as interlocking with the cooling roll 2 so as to have the same peripheral speed as that of the cooling roll 2, and is configured so that the embossed film 5 does not easily adhere to the pressure roll 3. is there.

Another configuration of the peeling device 6 uses an air knife 6b. This air knife 6b is shown in FIG.
, The blower 61, the cooler 62, the nozzle 6
3. It consists of a spout 64.

The jet port 64 is configured to jet a thin plate-shaped air jet with a gap capable of covering the entire width of the pressure roll 3 and a thickness of about 1 mm.

The plate-shaped air jet ejected from the air knife 6b is positioned so as to be ejected in the direction of the contact point P of the pressure roll 3, and as a result, the embossed film 5 in close contact with the pressure roll 3 is peeled off. In addition to acting as described above, the silicone rubber layer 3a on the surface of the pressure roll 3 also has an air cooling effect.

[0020]

As described above, the embossed film 5 which is easy to separate from the rough embossed surface of the cooling roll 2 and hard to separate from the surface of the pressure roll 3 which is smooth and in a high temperature state is forcibly applied. It is possible to peel off with a weak force without pulling it.

As a result of the above-mentioned peeling with a weak force,
Although the conventional film forming speed is limited to 100 m / min, the film forming speed of 150 to 160 m / min is possible in the apparatus of the present invention, and the effect of mass production is greatly increased.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a film forming apparatus of the present invention, in which (A) is a configuration diagram of a main part, and (B) is an enlarged explanatory view of a contact point portion between a cooling roll and a pressure roll.

FIG. 2 is a configuration diagram of an air knife.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 T-die 2 Cooling roll 3 Pressure roll 3a Silicon rubber layer 4 Smooth film 5 Embossed film 6 Peeling device 6a Peeling roll 6b Air knife 7 Touch-type cooling roll

Claims (3)

(57) [Claims] 1. A film forming apparatus for forming an embossed film by embossing a smooth film of a soft material extruded from a T-die at a contact point between a cooling roll having an embossed surface and a pressure roll having a smooth surface. A peeling device is provided below the contact point to prevent the embossed film that has been embossed after passing the contact point from adhering to the pressure roll surface having a smooth surface. Membrane equipment. 2. The peeling device includes a peeling roll that is in contact with the surface of the cooling roll near the contact point, and drives the peeling roll to have the same peripheral speed as the peripheral speed of the cooling roll. 2. The film forming apparatus according to claim 1, wherein: 3. The film forming apparatus according to claim 1, wherein the peeling device is an air knife that jets a thin plate-shaped air jet toward the contact point along the surface of the pressure roll.