JP2023132431A - Peeling device for peeling coat from film with coat, peeling method, and method for producing base film from which coat has been peeled off - Google Patents

Abstract

To provide a coat peeling device that can peel a coat from a surface of a film with the coat without using water or other solvents or without increasing an environmental load.SOLUTION: A coat peeling device of the present invention is a device for peeling a coat from a film with the coat having the coat on at least one side of a base film, and is arranged to face a surface having the coat, of the film with the coat, and includes a nozzle that sprays, onto the coat, particles made of dry ice, ice, or a material contained in the base film together with compressed air.SELECTED DRAWING: Figure 1

Description

The present invention provides a peeling device and a peeling method that can efficiently remove a coat from a coated film having a coat on at least one side of a base film, and a peeling method that can peel the coat from the coated film using the peeling method. , relates to a method for producing a base film from which a coating has been peeled off.

While plastics are used in a variety of fields, they are also considered to be a cause of marine pollution, such as microplastics, and there is an urgent need to reduce the environmental impact of plastics.

In addition, in recent years, with the evolution of IoT (Internet of Things), the number of electronic devices such as CPUs installed in computers and smartphones has increased, and with this, the number of multilayer ceramic capacitors (MLCCs) required to drive electronic devices has also increased. It is rapidly increasing. The general manufacturing method for MLCC is to use a release film with a release layer formed on a plastic base film as a carrier sheet, and to form a ceramic green sheet layer on the release film; There is a step of peeling off the ceramic green sheet layer to obtain a ceramic green sheet.

In this step, the release film from which the ceramic sheet has been peeled off is discarded as unnecessary material. That is, the increase in release film waste due to the recent rapid increase in the number of MLCCs has become an environmental problem, and efforts are being made to reuse plastic base films.

In order to reuse the discarded release film, a recycled film may be obtained by collecting it, crushing it, making it into resin chips, and then remelting it to form a film.

However, from the viewpoint of mold releasability, the components of the release layer contained in the release film generally have a different composition from those that make up the base film. If it is crushed into resin chips and then remelted to form a film, it becomes difficult to form a stable film because the components of the mold release layer exist as foreign matter.

In addition, even if a film can be formed, the release layer is present as a foreign substance, so quality deterioration is inevitable due to coloring of the film and changes in surface composition, and the original base material It is not possible to reproduce the film to the same level of quality as the original film.

Therefore, in order to recycle a release film as a recycled film, it is necessary to remove the components of the release layer contained in the release film to an extremely small amount of residue that does not pose a problem in terms of the quality of the recycled film.

After collecting/pulverizing/obtaining high-purity resin chips, it is desirable to remelt and recycle them as recycled film for a long period of time at low cost and without increasing environmental impact. , these realizations are extremely difficult.

In Patent Document 1, as a method for removing a mold release component from a mold release film, a mold release film in which a water-soluble resin layer is formed between a base film and a mold release layer is used, and the mold release film is soaked in a hot water bath for 2 seconds or more. A method is disclosed in which the release layer is peeled off by rubbing the surface of the release film with a brush roll after immersion.

Japanese Patent Application Publication No. 2004-363140

In the method disclosed in Patent Document 1, since hot water is used, a large amount of waste liquid in which the water-soluble resin layer is dissolved is generated. Disposal of this waste liquid itself leads to environmental pollution and is recognized as an increase in environmental burden, so it is clear that it contradicts the idea of recycling.

Further, there is a problem in that an expense is required when disposing of the product, which inevitably increases the cost.

Increasing the processing speed is very effective in aiming for low costs, but in the method disclosed in Patent Document 1, increasing the processing speed shortens the contact time in the hot water tank, It is expected that it will be less than a second. Therefore, in order to maintain contact for 2 seconds or more in the hot water tank, it is necessary to increase the size of the hot water tank to increase the path length. Along with this, there is a problem in that the amount of waste liquid in which the water-soluble resin layer is dissolved increases, and the environmental load further increases.

Therefore, the present invention provides a film peeling device and a film peeling method that can peel a film from the surface of a film with a film without using a solvent such as water and without increasing environmental load.

A film peeling device of the present invention that solves the above problems is a device that peels a film from a coated film having a film on at least one side of a base film, comprising:
A nozzle is arranged to face the surface of the coated film having the coating, and sprays particles made of dry ice, ice, or a material contained in the base film together with compressed air toward the coating. ing.
However, the structure of the film peeling device of the present invention does not include a film with a film.

A film peeling method of the present invention that solves the above problems is a method of peeling a film from a coated film having a film on at least one side of a base film, comprising:
Dry ice, ice, or particles made of a material contained in the base film are injected together with compressed air toward the coating of the coated film to peel the coating from the coated film.

In the film peeling method of the present invention, it is preferable that the particles sprayed together with compressed air remove a part of the base film.

The method for producing a base film from which a coating of the present invention has been peeled includes peeling the coating from a coated film having a coating on at least one side of the substrate film using the method of peeling a coating from a coated film of the present invention. The above base film is obtained.

By using the device and method for peeling a film from a film with a film of the present invention, it is possible to peel the film from the surface of the film with a film without using a solvent such as water and without increasing the environmental burden. can.

1 is a schematic diagram of a peeling device 1 of the present invention.

The inventors of the present invention have conducted intensive studies on methods for peeling off films without using solvents such as water and without increasing the environmental burden. I ended up finding a way.

[Target coated film]
The coating peeling device and peeling method for a coated film of the present invention are intended for a coated film having a coating on the surface of a base film, and are intended to peel and remove the coating from the base film, and the coating is removed from the base film. It may be present on one side or both sides of the film, and is not particularly limited.

The material constituting the film can be appropriately selected and used depending on the purpose and application of the film with the film.

When imparting mold releasability as in the case of a mold release film, it is preferable that a part of the film contains a mold release component. The release component here is a component that increases the contact angle of the film surface with water, that is, reduces the surface energy of the film. Compounds having a chain alkyl group and compounds having fluorine are preferred.

Depending on the required function, the film may be a mixture of the release component and other different components, or a layer of each may be laminated. In the case of a laminated film, it is preferable to form a layer containing a mold release component on the outermost surface in order to exhibit the mold release effect.

The layer containing the mold release component is generally a thin film, and for example, a mold release film used for MLCC is often a film with a thickness of 1 μm or less.

As the resin constituting the base film, resins composed of polyester, polyimide, polypropylene, polyamide, polycarbonate, polyacetate, polyethylene, etc. can be used. In particular, polyesters containing polyethylene terephthalate or polyethylene naphthalate as main constituents are preferred because they have excellent quality stability after recycling, and a release film having a thickness of several tens of μm is used.

[Coating peeling device from coated film]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a device for peeling a film from a coated film of the present invention (hereinafter referred to as a film peeling device) will be described based on the drawings. Note that the following description illustrates one embodiment of the present invention, and is not limited thereto, and various changes can be made without departing from the spirit of the present invention.

FIG. 1 is a schematic diagram of a coating stripping apparatus of the present invention. As shown in FIG. 1, the film peeling device 1 is equipped with an unwinding device 4 that unwinds the coated film 2, and a winding device 5 that winds up the base film 3 after the film has been peeled off. Between the unwinding device 4 and the winding device 5, there is a drive device 6a for conveying the coated film 2, a blasting mechanism 14 for peeling off the coating from the coated film 2, and a base after the coating has been peeled off. A drive device 6b for conveying the material film 3 is provided.

The blasting mechanism 14 includes a nozzle 11 arranged opposite to the coated surface of the coated film 2, and the nozzle 11 is configured to blow dry ice, ice, or a material contained in the base film together with compressed air. The structured particles 10 are sprayed towards the coating.

When the particles 10 are dry ice or ice, the size of the particles 10 supplied from the supply pipe 12 to the nozzle 11 together with compressed air is appropriately selected in the range of 0.1 to 5 mm depending on the thickness and hardness of the coating. Since the particles 10 are formed by crushing dry ice or ice blocks, their shape is not necessarily circular, but depending on the crushing method, they often take the form of approximately cylindrical pellets, and the particle size is as follows: Refers to the height dimension of the cylinder.

Similarly, when the particles 10 are made of a material included in the base film, the dimensions of the particles 10 supplied from the supply pipe 12 to the nozzle 11 range from 0.1 to 0.1, depending on the thickness and hardness of the coating. Select as appropriate within the range of 5 mm. The shape of the particles may be approximately spherical or polygonal, and the shape that allows the most efficient peeling of the coating may be appropriately selected.

The material of the particles 10 is not particularly limited as long as it is a material included in the base film, but for example, in the case of a polyethylene terephthalate film, it is preferable to use particles composed of polyethylene terephthalate as the main component. Furthermore, in the case of a base film containing a plurality of materials, if particles made of the material with the highest hardness are selected, the film can be peeled off efficiently.

The nozzle 11 is installed so that the particles 10 hit the entire range in the width direction of the coated film 2 being transported. If the width of the coated film 2 is larger than the range that the particles 10 hit, a mechanism (not shown) for reciprocating the nozzle 11 in the width direction of the coated film 2 may be provided, or a plurality of nozzles 11 may be provided in the width direction. That's fine.

Conditions for increasing the peeling efficiency, focusing on each particle, include increasing the force that the particles act on perpendicularly to the coating, and increasing the relative speed with the coated film. In order to satisfy both of these conditions, it is preferable to set the angle θ between the spray direction of the nozzle 11 and the surface of the coating of the coated film 2 in the range of 30 to 90 degrees. If θ exceeds 90°, the force and relative velocity of the particles acting perpendicularly to the coating decrease, and the efficiency of peeling tends to decrease. On the other hand, when θ is less than 30°, although the relative velocity increases, the force with which the particles act perpendicularly to the coating decreases, so that the peeling efficiency tends to decrease.

The distance between the nozzle 11 and the coated film 2 is not particularly limited as long as the coat can be peeled off, but in general, the closer the nozzle 11 is to the coated film 2, the better the particles will collide with the coat while maintaining the jetting speed. Therefore, the film can be peeled off efficiently, which is preferable.

Furthermore, when the transport speed of the coated film 2 is high, the number of particles colliding with each other per unit area of the film is reduced, so it is preferable to provide a plurality of nozzles 11 in the transport direction of the coated film 2.

The cover 13 is for preventing particles from scattering, and may be appropriately installed as necessary. Further, a particle collection mechanism (not shown) may be provided inside the cover 13 to collect and reuse the scattered particles.

Since the film peeling device 1 of this embodiment is intended for a film with a film having a film on only one side of the base film, the nozzle 11 is provided on one surface of the film with a film so as to face each other. When the target is a coated film having coatings on both sides of the base film, the nozzle 11 may be provided facing both sides of the coated film.

[Method for peeling off film from coated film]
The method for peeling a film from a film with a film of the present invention (hereinafter referred to as the film peeling method) is as follows:
Particles made of dry ice, ice, or a material contained in the base film are injected together with compressed air toward the coating of the coated film 2 to peel the coating from the coated film.

Sandblasting is a conventionally commonly used peeling process, in which particles made of metal, ceramic, or the like are used. When sandblasting is applied to peel off a coated film, particles made of metal, ceramic, etc. pierce the base film and remain as foreign matter when the coat is peeled off. Therefore, if a recycled film is obtained by reusing the base film that has been peeled off, a film whose quality has deteriorated compared to the original base film will be obtained. It is also possible to wash away the stuck particles with a liquid such as water, but this would generate waste liquid, which would increase the environmental burden and go against the idea of recycling.

On the other hand, in the film peeling method of the present invention, since the particles are dry ice or ice, the particles evaporate and disappear after the film is peeled off, so there is no particle residue on the base film after peeling. It becomes possible to reproduce the film with the same level of quality as the original base film. Furthermore, since cleaning with liquid such as water is not necessary, the environmental burden does not increase. In particular, dry ice is often manufactured by recycling CO ₂ emitted from factories and the like, and is therefore suitably used from the viewpoint of environmental impact.

If the particles are made of a material contained in the base film, even if the particles pierce the base film and remain when the film is peeled off, they cannot become foreign particles, so they can be removed from the original base. It becomes possible to recycle the film into a film with the same level of quality as the raw material film.

For example, when the base film is a polyethylene terephthalate film, particles composed of polyethylene terephthalate as the main component may be used.

Further, it is preferable that the particles made of the material contained in the base film be a highly pure material that does not contain foreign substances. For example, if a polyethylene terephthalate film with a coating before peeling has foreign matter residue at a level that does not pose a quality problem, if high-purity polyethylene terephthalate particles that do not contain foreign matter are used, the coating can be peeled off and the base film can be attached to the base film. The particles pierce and remain, increasing the concentration of polyethylene terephthalate, ie, decreasing the concentration of foreign matter. Therefore, the recycled film obtained in this way can be expected to have improved quality compared to the polyethylene terephthalate film before peeling.

When peeling, we want to reduce the amount of film residue that remains as foreign matter to zero or as much as possible. To achieve this, it is necessary to remove as many particles as possible on the surface layer of the base film located at the interface with the film. is preferably reached so that the particles preferably remove a portion of the substrate film.

By allowing the particles to peel off the film and also remove the surface layer of the base film located at the interface with the film, the film can be reliably peeled off and a base film free of residue can be obtained.

In order to realize these, it is preferable to provide a plurality of nozzles in the film transport direction to cause many particles to collide with the film. For example, by spraying dry ice or ice from a nozzle provided upstream in the conveyance direction, and spraying particles made of the material contained in the base film from a nozzle provided downstream, in addition to peeling off the coating, While a part of the base material is removed, particles made of the material contained in the base film remain on the base film as described above, so it can be expected that the quality of the recycled film will improve.

Note that as long as the particles used are composed of dry ice, ice, or a material contained in the base film, there are no particular restrictions on the combination of particles or the number of nozzles, and the amount of residue required It may be determined as appropriate.

In addition, regardless of the number of nozzles, more damage may be caused to the coated film by changing the shape, size, or spray amount of the particles or increasing the spray speed.

[Method for manufacturing release film]
In the method for manufacturing a peelable film of the present invention (hereinafter referred to as the manufacturing method), the film is peeled off from a coated film having a coating on at least one side of the base film, using the above-described film peeling method. It's something you get.

If the base film from which the coating has been peeled is recovered/pulverized/obtained with high-purity resin chips using the manufacturing method of the present invention, and then remelted to obtain a recycled film, the cost will be reduced without increasing the environmental burden. It is possible to circulate recycling over a long period of time. In particular, when used suitably for release films such as MLCC, it exhibits outstanding effects.

The coated film that can be applied to the coated film peeling device and peeling method of the present invention can be applied to renewable resin films that have a coat on one side of the base film, paper films, metal films, etc., but is limited to these. It is not something that will be done.

Furthermore, the peeling device and method for peeling a coated film of the present invention can be used not only to peel off a coat from a used coated film that has been used once in a manufacturing process such as MLCC, but also to remove a coat from an unused coated film. It is also used to peel coatings from films.

1 Film peeling device 2 Film with film 3 Base film 4 Unwinding device 5 Winding device 10 Particles 11 Nozzle 12 Supply pipe 13 Cover 14 Blasting mechanism

Claims (4)

An apparatus for peeling a coating from a coated film having a coating on at least one side of a base film, the apparatus comprising:
A nozzle is disposed opposite to the surface of the coated film having the coating, and sprays particles made of dry ice, ice, or a material contained in the base film together with compressed air toward the coating. prepared,
A device for removing coatings from coated films. A method of peeling a coating from a coated film having a coating on at least one side of a base film, the method comprising:
Peeling the coating from the coated film by spraying dry ice, ice, or particles made of a material contained in the base film together with compressed air toward the coating of the coated film.
Method for removing coating from coated film. 3. The method of peeling a coating from a coated film according to claim 2, wherein the particles injected together with compressed air remove a portion of the base film. Using the method for peeling a film from a film with a film according to claim 2 or 3, the film is peeled from a film with a film having a film on at least one side of the base film to obtain the base film, the film is peeled off. Method for manufacturing base film.

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