JP6844965B2 - Roll manufacturing method and roll - Google Patents

Description

The present invention relates to a roll manufacturing method and a roll.

Conventionally, various adhesive sheets have been proposed, and are applied to various fields such as labels for name plates attached to home electric appliances. For example, Patent Document 1 discloses a pressure-sensitive adhesive sheet capable of removing an air pool generated between the pressure-sensitive adhesive sheet and an adherend. In this adhesive sheet, a plurality of recesses are provided on the surface of the adhesive layer that adheres to the adherend, and the air in the air pool is released to the outside through the recesses.

Further, the pressure-sensitive adhesive sheet of Patent Document 1 has a laminated structure in which an pressure-sensitive adhesive layer is provided on one side of a base material and a release material is arranged on the surface of the pressure-sensitive adhesive layer in which the above-mentioned recesses are formed. A gap is formed between the recess provided on the surface of the adhesive layer and the release material.

The form in which the laminate having such a laminated structure is used differs depending on the application, but an example of one form is a long form such as a tape. In this case, for example, for ease of storage and carrying, it is common to wind the laminate around a core having a tubular shape to form a roll.

International Publication No. 2015/152347

Therefore, the present inventors wound a long laminated body having the same laminated structure as in Patent Document 1 around the core to prepare a roll, and such a roll adhered with the passage of time. It was newly found that the pressure-sensitive adhesive layer is deformed by narrowing the gap between the recess on the surface of the layer and the release material, and as a result, the thickness of the pressure-sensitive adhesive layer is slightly reduced.

Even when such a change in thickness occurs in the adhesive layer, if the winding state of the roll is maintained well, for example, the work such as carrying the roll and attaching it to the unwinding device can be smoothly performed. Focusing on what can be done, the present inventors have come up with the present invention.

That is, the present invention has been made based on newly obtained knowledge, and an object of the present invention is to provide a roll manufacturing method and a roll capable of maintaining a good winding state of a roll.

The roll manufacturing method of the present invention for achieving the above object has a base material layer, an adhesive layer, and a release material in this order in the stacking direction, and has a plurality of gaps between the adhesive layer and the release material. The existing elongated laminate is wound around the core after drying the core made of paper tubes.

The roll of the present invention for achieving the above object has a base material layer, an adhesive layer, and a release material in this order in the stacking direction, and has a plurality of gaps between the adhesive layer and the release material. It has a long laminated body and a core having a tubular shape around which the laminated body is wound. The core is a paper tube, and the core and the laminated body are tightened to each other in the radial direction. ..

According to the roll manufacturing method and the roll having the above structure, the core and the laminate are surely held so as not to be displaced in the axial direction of the core, so that a good winding state of the roll can be maintained.

It is a flowchart of the roll manufacturing method of embodiment. It is a figure which shows typically the drying of a core. It is a figure which shows typically the winding of the laminated body around a core. It is an image of the surface of the prototype adhesive layer. It is a figure which shows the state of the laminated body and the core of the embodiment before the adhesive layer is thinned. It is a figure which shows typically the state of the laminated body and the core when it is assumed that the adhesive layer is thinned while the outer diameter of the core is constant unlike the embodiment. It is a figure which shows the state of the laminated body and the core of embodiment when the adhesive layer becomes thin. It is a graph which shows the relationship between the moisture content of a paper tube as a core, and the outer diameter. It is a graph which shows the thickness of the adhesive layer on the center side and the outside of a roll. It is a figure which shows the laminated body of another form. It is a figure which shows the roll of another form. It is a figure which shows the laminated body of still another form.

Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. The dimensional ratios in the drawings are exaggerated for convenience of explanation and differ from the actual ratios.

As shown in FIG. 1, the roll manufacturing method of the embodiment includes a core drying step S1 and a winding step S2.

As shown in FIG. 2, in the core drying step S1, the core 110 having a tubular shape is dried. The core 110 is a paper tube. Here, the paper tube may include, for example, a resin layer, but is preferably composed of only paper because of the ease of adjusting the proportion of water contained in the core 110 (moisture content). The dimensions of the core 110 are not particularly limited, but are, for example, an inner diameter of about 75 mm and a thickness of 6 to 20 mm.

The core 110 is dried by being left in a drying oven 10 in a high temperature atmosphere maintained at a predetermined temperature for a predetermined time, but the core 110 is not limited to this, and is dried by another method such as heating using radiant heat. You may.

The temperature in the drying furnace 10 is not particularly limited, but is, for example, 40 ° C to 60 ° C, preferably 40 ° C. The relative humidity in the drying furnace 10 is not particularly limited, but is, for example, 10 to 20%.

The time for which the core 110 is left in the drying furnace 10 is, for example, 24 hours, but the time is not limited to this, and can be appropriately set according to the temperature in the drying furnace 10 and the like.

By raising the temperature inside the drying furnace 10, the moisture content of the core 110 can be further lowered, but quality is taken into consideration so that the core 110, which is a paper tube, does not suffer from defects such as charring and deformation, and the temperature is high. The temperature inside the drying oven 10 is set in consideration of safety when the drying oven 10 is operated for a long time in this state.

When the drying is completed after a predetermined time has elapsed, the core 110 is taken out from the drying furnace 10 and the winding step S2 is performed.

As shown in FIG. 3, in the winding step S2, the long laminated body 120 is wound around the dried core 110 immediately after the core drying step S1 to produce the roll 100. The laminate 120 is wound around, for example, by a rotating core 110. Since the core 110 can be rotated by using, for example, a conventionally known winding device using a motor as a drive source, the description of the winding device here will be omitted. Further, the core 110 may be fixed without being rotated, and the laminate 120 may be wound around the core 110.

The length of the laminated body 120 wound around the core 110 is not particularly limited, but when the relatively long laminated body 120 is wound and the diameter of the roll 100 becomes large, the laminated body 120 is wound. A thick core 110 having a thickness of, for example, 20 mm is preferably used so that the core 110 is not deformed by tightening with each rotation.

The laminate 120 has the base material layer 121, the adhesive layer 122, and the release material 123 in this order in the lamination direction.

The base material layer 121 is not particularly limited, and examples thereof include a paper base material, a resin base material such as a resin film, and a base material obtained by laminating a paper base material with a resin. The thickness of the base material layer 121 is not particularly limited, but is, for example, 5 to 1000 μm.

When the base material layer 121 is a paper base material, the papers constituting the paper base material include, for example, high-quality paper, impregnated paper, coated paper, art paper, glassin paper, kraft paper, crepe paper, Japanese paper, heat-sensitive paper, and thermal transfer. Examples include paper.

When the base material layer 121 is a resin base material, examples of the resin constituting the resin base material include polyolefin resins such as polyethylene and polypropylene; polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; and polyvinyl chloride. , Vinyl chloride resin such as polyvinylidene chloride, polyvinyl alcohol, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer; polystyrene; acrylonitrile-butadiene-styrene copolymer; urethane resin such as polyurethane and acrylic modified polyurethane; Acrylic resin; fluororesin; cellulose triacetate; polycarbonate; polymethylpentene; polysulfone; polyether ether ketone; polyether sulfone; polyphenylene sulfide; polyimide resin such as polyetherimide and polyimide; polyamide resin and the like.

When the base material layer 121 is a base material obtained by laminating a paper base material with a resin, examples of such a base material include laminated paper obtained by laminating the above paper base material with a thermoplastic resin such as polyethylene.

The base material layer 121 may contain various additives such as an ultraviolet absorber, a light stabilizer, an antioxidant, an antistatic agent, a slip agent, an antiblocking agent, and a colorant.

The adhesive layer 122 includes a resin portion 122A containing a resin as a main component and a particle portion 122B composed of fine particles. Recesses 122C are irregularly formed on the surface of the adhesive layer 122, and gaps 124 are irregularly present between the recess 122C and the release material 123. The thickness of the adhesive layer 122 is not particularly limited, but is, for example, 1 to 300 μm.

The composition of the distribution of the resin portion 122A and the particle portion 122B may be such that the resin portion 122A and the particle portion 122B are distributed substantially evenly, and the portion mainly composed of the resin portion 122A locally and the portion mainly composed of the resin portion 122A are mainly used. The configuration may be such that the portion including the particle portion 122B can be separated.

Further, in the place where the recess 122C exists, the distribution may be such that the proportion of the particle portion 122B is smaller than the others, or the particle portion 122B may not partially exist.

The recess 122C is formed, for example, by self-forming the adhesive layer 122. Here, the self-formation means a phenomenon in which the autonomous formation process of the adhesive layer 122 proceeds by drying the coating film containing the material for forming the adhesive layer 122, and a disordered shape is naturally created. ..

There are several possible processes in which the recess 122C is formed, and one of them will be described below.

First, at the time of forming a coating film containing fine particles which is a material for forming the particle portion 122B, fine particles are randomly present in the coating film.

In the process of drying the coating film, shrinkage stress is generated inside the coating film, and cracks occur in the coating film at a portion where the binding force of the resin, which is considered to be due to the presence of fine particles, is weakened. Then, it is considered that the resin around the cracked portion flows into the space temporarily created by the crack to form the recess 122C on the surface of the adhesive layer 122.

The proportion of the particle portion 122B in the portion where the recess 122C is formed is smaller than that in the other portions because the fine particles that were initially present when the coating film was cracked during the drying process of the coating film. It is thought that this is because it is pushed away to other places.

Further, apart from the above-mentioned idea, the formation of the recess 122C due to the aggregation of fine particles is also conceivable. In this case, at the time of forming the coating film, the pressure-sensitive adhesive forming the resin portion 122A and the fine particles (for example, silica particles) that are difficult to disperse in the adhesive were uniformly dispersed in the coating film via a solvent that easily gets wet with them. However, in the process of drying the coating film, the solvent intervening between the fine particles and the pressure-sensitive adhesive is lost, and as a result, a portion where the fine particles are aggregated and a portion where the fine particles are hardly present are formed. Then, the portion where the fine particles are hardly present becomes the recess 122C. The portion where the fine particles are aggregated becomes a convex portion, but is flattened by arranging the release material 123.

The shape of the recess 122C formed by self-forming can be adjusted to some extent by adjusting the drying conditions of the coating film, the type of the material for forming the adhesive layer 122, and the content of each of these compositions, but the shape is exactly the same. It can be said that it is virtually impossible to reproduce the thing.

The resin portion 122A is a portion containing components other than the fine particles constituting the particle portion 122B. The resin portion 122A contains a resin having adhesiveness as a main component, and may also contain a cross-linking agent and a general-purpose additive.

The adhesive resin contained in the resin portion 122A is, for example, an acrylic resin, a urethane resin, a rubber resin, a silicone resin, and the like, but is not limited thereto. Examples of the cross-linking agent contained in the resin portion 122A include, but are not limited to, an isocyanate-based cross-linking agent, an epoxy-based cross-linking agent, an aziridine-based cross-linking agent, and a metal chelate-based cross-linking agent. Examples of the general-purpose additive contained in the resin portion 122A include a tackifier, an antioxidant, a plasticizer, a rust preventive, a pigment, a dye, a retarder, a reaction accelerator, an ultraviolet absorber, and the like. Not limited to.

The particle portion 122B is composed of fine particles, and examples thereof include inorganic particles such as dry silica, wet silica, titanium oxide, zinc oxide, barium sulfate, calcium carbonate, magnesium carbonate, glass, and smectite, and acrylic, styrene, and melamine. Examples include, but are not limited to, organic particles.

The release material 123 is formed, for example, by applying a release agent on a base material for the release material 123. Both sides of the release material 123 may be peeled, or one side may be peeled.

As the base material for the release material 123, as in the base material layer 121, for example, a paper base material such as high-quality paper or glassine paper, a resin base material such as polyethylene terephthalate, polypropylene, or polyethylene, or a paper base material is used as a resin base material. Examples thereof include a base material laminated with. Examples of the release agent include rubber-based elastomers such as silicone-based resins, olefin-based resins, isoprene-based resins, and butadiene-based resins, long-chain alkyl-based resins, alkyd-based resins, and fluorine-based resins.

The thickness of the release material 123 is, for example, 10 to 200 μm, but is not limited thereto. The release material 123 preferably has a flat surface without an uneven shape such as an embossed pattern. The release material 123 is peeled off from the surface of the adhesive layer 122 when the laminate 120 is attached to the adherend.

As shown in FIG. 4, the recess 122C on the surface of the adhesive layer 122 irregularly extends two-dimensionally. The recess 122C does not have a predetermined pattern. Here, the predetermined pattern means a shape that becomes a constant repeating unit.

The recess 122C includes a relatively long groove shape and a relatively short recess shape, which are connected to each other and communicate with the edge of the adhesive layer 122. Therefore, when the laminate 120 is attached to the adherend, the air entering between the adhesive layer 122 and the adherend, or, for example, the outgas released from the resin adherend, is transmitted through the recess 122C. Is discharged to the outside of the adhesive layer 122. Therefore, in the laminated body 120 attached to the adherend, swelling due to air, outgas, or the like is prevented.

As shown in FIG. 5, in the roll 100 immediately after production, the adhesive layer 122 is in a state substantially similar to that before the laminated body 120 is wound.

However, when the adhesive layer 122 is affected by, for example, the tightening force due to the winding of the laminated body 120 or the temperature change after the roll 100 is manufactured, the original shape cannot be maintained due to the presence of the gap 124, and the gap cannot be maintained. As the 124 is narrowed and deformed, the wall thickness of the adhesive layer 122 becomes thinner.

Unlike the present embodiment, even when there is no gap 124 and, for example, the adhesive layer 122 and the release material 123 are in close contact with each other on the entire surface, the thickness of the adhesive layer 122 is slightly reduced due to the tightening force or the like. In the form, the adhesive layer 122 is more likely to be thinned due to the presence of the gap 124.

Therefore, as shown in FIG. 6, if the outer diameter of the core 110 remains constant, a slight gap is generated between the core 110 and the laminated bodies 120, or between the laminated bodies 120, resulting in a slight gap. , The core 110 may come off or the laminated body 120 may loosen, which is not preferable.

On the other hand, in the present embodiment, the core 110 is dried in the core drying step S1, whereby the core 110 expands with moisture in the air in the environment outside the drying furnace 10 thereafter. ..

Therefore, as shown in FIG. 7, the core 110 and the laminated body 120 are tightened to each other in the radial direction, the core 110 and the laminated body 120 are brought into close contact with each other, and the laminated bodies 120 are brought into close contact with each other.

In fact, when the present inventors made a prototype of the core 110 and experimented with it, the expansion of the core 110 was confirmed.

As shown in FIG. 8, the present inventors left the paper tube in the drying oven 10 at 40 ° C. for 24 hours to dry it (range shown by A in FIG. 8), and then at 23 ° C., the relative humidity was 50%. (The range shown by B in FIG. 8), and the change in the moisture content of the paper tube (◯ in FIG. 8) and the change in the outer diameter (Δ in FIG. 8) were measured. The paper tube used is plain. The water content was determined by defining the weight of the paper tube when dried at 120 ° C. for 12 hours as 0%.

As shown by the change of ◯ in the range A of FIG. 8, when the moisture content of the paper tube decreases with the passage of time due to drying, the outer diameter of the paper tube becomes larger as shown by the change of Δ in the same range A. It decreased over time. In the present embodiment, the laminate 120 is wound in a state where the core 110 is dried and shrunk in this way, and the roll 100 is produced.

On the other hand, under the condition assuming an environment similar to that in which the roll 100 is normally used or stored, the paper tube absorbs the moisture in the air as shown by the change of ◯ in the range B of FIG. As a result, the water content increased, and along with this, the outer diameter of the paper tube increased, as shown by the change in Δ in the same range B.

As described above, in the present embodiment, in the environment where the roll 100 is normally used or stored, the core 110, which is a paper tube, is in an expanded state, and the laminate 120 is pressed outward in the radial direction. For tightening, the core 110 and the laminate 120 are held so as not to be displaced in the axial direction of the core 110.

Unlike the present embodiment, the core 110 is not dried, or the core 110 is placed in an environment substantially similar to the normal use environment or storage environment of the roll 100 after a while from the drying of the core 110. When the 120 is wound, the core 110 already contains some moisture in the air at the time of winding, so that the expansion of the core 110 due to moisture absorption does not occur to the same extent as in the case of the present embodiment. , Even if it occurs, it is smaller than that of the present embodiment. Therefore, the core 110 is not in a state of pressing and tightening the laminated body 120 radially outward, and it is not possible to follow the thinning of the adhesive layer 122 as in the present embodiment. Therefore, there is a possibility that the core 110 may come off or the laminated body 120 may loosen, which is not preferable.

Next, the action and effect of this embodiment will be described.

According to the present embodiment, as described above, the core 110 and the laminated body 120 are surely held so as not to be displaced in the axial direction of the core 110, so that, for example, the core 110 is pulled out or the laminated body 120 is loosened. It is difficult to maintain a good winding state of the roll 100.

In order to investigate where in the roll 100 the adhesive layer 122 is likely to be deformed, the present inventors wound the laminate 120 around the core 110 by 400 m to make a trial roll 100, and made the roll 100 relative to each other at 40 ° C. A promotion experiment was conducted in which the adhesive layer 122 was promoted to be deformed by being left for 7 days in a humidity of 80%, which is harsher than the normally assumed usage environment or storage environment. The adhesive layer 122 becomes more fluid as the temperature increases, and is more likely to deteriorate as the relative humidity increases.

As a result of the acceleration experiment, as shown in FIG. 9, the thickness of the adhesive layer 122 is thinner on the center side (core 110 side) than on the outside of the roll 100, and the center side of the roll 100 is looser than on the outside. The possibility was relatively high.

However, in the present embodiment, since the central side thereof, which is thinner than the outer side, is firmly held by tightening from the core 110, a good winding state can be maintained particularly effectively.

Further, in the present embodiment, the recess 122C is provided on the surface of the adhesive layer 122, and air and gas are released from the adhesive layer 122 along the recess 122C, so that the swelling of the laminated body 120 due to air and gas can be prevented.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims.

For example, in the above embodiment, the recess 122C is provided on the surface of the adhesive layer 122, and a gap 124 is formed between the recess 122C and the flat release material 123, but the gap is between the adhesive layer and the release material. It suffices to exist between them, and the specific configuration for forming a gap between them is not particularly limited. In addition to the above-described embodiment, the present invention includes other embodiments in which a plurality of gaps are formed between the adhesive layer and the release material.

For example, as shown in FIG. 10, the present invention includes a laminate 220 having a release material 223 having a plurality of recesses 223A formed on the surface thereof and an adhesive layer 222 having a flat surface, and in this embodiment, the recesses 223A. A gap 224 is formed between the adhesive layer 222 and the flat surface of the adhesive layer 222.

As shown in FIG. 11, in the roll 200 in which the laminated body 220 is wound around the core 110, the adhesive layer 222 enters the gap 224 due to the influence of tightening, temperature rise, etc. due to the winding, and the adhesive layer 222 and the adhesive layer 222. The release material 223 and the release material 223 are pressed against each other. As a result, the thickness of the laminated body 220 is reduced, but the core 110 expands to follow the change, so that the core 110, the laminated body 220, and the laminated body 220 are in close contact with each other. Therefore, a good winding state of the roll 200 is maintained.

When the release material 223 is pressed against the pressure-sensitive adhesive layer 222, the concave shape of the surface of the release material 223 is transferred to the pressure-sensitive adhesive layer 222, and a recess for allowing air or gas to escape is formed on the surface of the pressure-sensitive adhesive layer 222.

Further, unlike this, even in a form in which a recess for allowing air or gas to escape is provided in advance on the surface of the adhesive layer, how the recess is provided is limited to self-formation as described in the above embodiment. Not done.

For example, the laminate 320 shown in FIG. 12 includes a base material layer 321 having a concave shape formed on its surface, and the adhesive layer 322 follows the concave shape to form a concave portion 322A for allowing air or gas to escape. Further, a gap 324 is formed between the recess 322A and the surface of the flat release material 123. In such a form, the material for forming the pressure-sensitive adhesive layer does not necessarily have to be a material for self-forming the recesses, and may be another general pressure-sensitive adhesive.

Further, the recesses 122C, 223A, 322A, and the gaps 124, 224, and 324 in each of the above-described embodiments are irregularly formed, but the present invention is not limited thereto. Such recesses and gaps are, for example, a rule in which each of the plurality of gaps or each of the plurality of recesses is formed at equal intervals in the same shape, or a predetermined pattern formed in an irregular shape is constant. It may be formed regularly, such as being repeated according to the sex.

100, 200 rolls,
110 cores,
120, 220, 320 laminates,
121, 321 base material layer,
122, 222, 222 adhesive layer,
122A resin part,
122B particle part,
122C, 223A, 322A recess,
123, 223 release material,
124, 224, 324 gaps.

Claims (4)

A core made of a paper tube is formed by having a base material layer, an adhesive layer, and a release material in this order in the stacking direction, and a long laminate having a plurality of gaps between the adhesive layer and the release material. A roll manufacturing method in which the core is wound after being dried. The roll according to claim 1, wherein a plurality of recesses are formed on the surface of the adhesive layer, and the laminate in which the gap is formed between the recess and the release material is wound around the core. Production method. A long laminate having a base material layer, an adhesive layer, and a release material in this order in the stacking direction and having a plurality of gaps between the adhesive layer and the release material in surface contact with each other.
It has a core having a tubular shape in which the laminate is wound, and
Even if the core is a paper tube and the thickness of the laminated body on the core side is thinner than that of the laminated body on the outer side in the radial direction, the core and the laminated body are tightened to each other in the radial direction. Yes, roll. The roll according to claim 3, wherein a plurality of recesses are provided on the surface of the adhesive layer, and the plurality of gaps exist between the plurality of recesses and the release material.