JP2012045929A - Printing polyester film and printing polyester film coating can body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing polyester film that is guaranteed in flaw-proof and slipperiness of printing film, while being able to carry out image expression of a matte and to provide a printing polyester film coated can body using this printing polyester film.SOLUTION: The printing polyester film 1 includes: a printing layer 3 comprising resin composition containing pigment provided in one side surface of polyester film used as a substrate; a thermosetting resin system adhesive layer 4 provided on the printing layer 3; a resin composition layer 5 provided in another side surface of the polyester film used as the substrate, and comprising resin composition in which a particle 7 is dispersed; and a thermosetting overcoat layer which is provided on the resin composition layer 5 and has a rough surface-like part formed by coating the inorganic particle or organic particle projected from the surface of the resin composition layer 5.

Description

  The present invention relates to a printed polyester film that covers the outer surface of a can body and a printed polyester film-coated can body.

  Conventionally, as a printed polyester film that is heat-bonded to a metal plate for materials through a thermosetting resin adhesive layer to form a coating layer, a resin composition containing a pigment on one side of a polyester film that serves as a substrate is used. And a thermosetting overcoat layer containing a matting component such as inert inorganic particles or a crosslinked polymer is known on the other side. (For example, refer to Patent Document 1).

  When the printed polyester film is bonded to the metal plate for can body material through the thermosetting resin adhesive layer, the printed layer includes a thermosetting overcoat layer containing the matting component. It is said that a matte-like image / design can be expressed by seeing through the watermark.

JP 2002-193267 A

  By the way, in general, the thermosetting overcoat layer is provided for ensuring the dimensional stability of the polyester film serving as the base, preventing scratches from the outer surface of the film, and the like, so that it is hard and tough. Characteristics are required.

  On the other hand, in order to produce a matting effect by dispersing matting components such as inert inorganic particles or cross-linked polymers in the thermosetting overcoat layer of the printed polyester film, the particles of matting components are dispersed. It is required to form a thermosetting overcoat layer with a resin composition having printability such as viscosity, drying property, etc. suitable for printing at a predetermined location where stability and matte image / design expression are desired.

  However, when the matting component is dispersed in the thermosetting overcoat layer so as to have a matting effect, there is a problem that the characteristics generally required for the thermosetting overcoat layer cannot be obtained.

  In particular, when a matting component such as inert inorganic particles or a crosslinked polymer is dispersed in the thermosetting overcoat layer, the inert inorganic particles or the crosslinked polymer is exposed on the surface of the thermosetting overcoat layer. Will do. Therefore, the slipperiness required for the thermosetting overcoat layer cannot be ensured, and when transporting the can body in which the protective coating layer is formed by the polyester film, the can bodies or between the transport guide and the like On the other hand, there is a problem that the contact tends to cause scratches.

  The present invention eliminates such inconvenience, and can display a matte tone image when bonded to a metal plate, maintains the dimensional stability of a polyester film as a substrate, and scratches from the outer surface of the film. It is an object of the present invention to provide a printed polyester film that can prevent sticking and can maintain slipperiness when cans collide with each other, and a printed polyester film-coated can body using the same.

  In order to achieve such an object, the printed polyester film of the present invention is heat-bonded to a metal plate for can body material or a bottomed cylindrical can body through a thermosetting resin adhesive layer to form a protective coating layer. A printed polyester film comprising a resin composition containing a pigment provided on one surface of a polyester film serving as a substrate, and a thermosetting resin adhesive layer provided on the printed layer A resin composition layer provided on the other surface of the polyester film serving as a substrate and made of a resin composition in which inorganic particles or organic particles are dispersed; and the resin composition layer provided on the resin composition layer And a thermosetting overcoat layer having a rough surface portion formed by coating the inorganic particles or the organic particles protruding from the surface.

  According to the printed polyester film of the present invention, when bonded to a bottomed cylindrical can body obtained using the metal plate for can body material or the metal plate for can body material, the resin composition layer and Through the thermosetting overcoat layer, an image, a design, and the like by the printed layer can be seen through. At this time, the resin composition layer is composed of a resin composition in which the inorganic particles or organic particles are dispersed, and a rough surface portion is formed by the inorganic particles or organic particles on the surface of the thermosetting overcoat layer. ing. As a result, the rough surface portion scatters incident light, and the inorganic particles or organic particles themselves act as a matting agent that scatters incident light. It can be performed.

  Further, according to the printed polyester film of the present invention, the thermosetting overcoat layer does not contain a matting component, and thus has the same resin composition as that used so far as the thermosetting overcoat layer of the printing film. Therefore, it is possible to maintain the dimensional stability of the polyester film serving as the substrate required as the overcoat layer, prevent damage from the outer surface of the film, and maintain the slipperiness.

  Further, according to the printed polyester film of the present invention, the inorganic particles or organic particles protruding from the surface of the resin composition layer are covered with the thermosetting overcoat layer, so that the slipperiness of the can body is ensured. It is possible to prevent the printed polyester film and the surface of the can from being damaged.

  In the printed polyester film of the present invention, the resin composition layer is provided on a part of the other surface of the polyester film serving as a base, and the thermosetting overcoat layer is formed on the resin composition layer and the polyester film. May be provided on a portion of the other surface where the resin composition layer is not provided. That is, in the printed polyester film of the present invention, the resin composition layer may include a resin composition in which inorganic particles or organic particles are dispersed in a part of the printed polyester film or on the entire surface.

  According to the printed polyester film having such a configuration, a resin composition layer containing a matting component can be printed at a predetermined position on the outer surface of the film by a conventional printing method, and the thermosetting overcoat layer is formed thereon. Because it is provided, a portion of the surface is matte without considering the printability of the thermoset overcoat layer in the matte portion of the surface and the thermoset overcoat layer in other portions that are not matte. be able to.

  By the way, the printed polyester film as in the present invention is generally long, and the thermosetting overcoat layer or the thermosetting resin-based adhesive layer is formed along the longitudinal direction of the polyester film serving as a substrate. After that, it is wound up and stored again.

  Here, in the process of forming a printed layer, a thermosetting resin adhesive layer, a resin composition layer, a thermosetting overcoat layer, etc. on a polyester film as a substrate, the film treated in each step is wound or wound. The blocking property when returning is required. For example, when the thermosetting overcoat layer and the thermosetting resin adhesive layer are wound and stored, the thermosetting overcoat layer and the thermosetting resin adhesive layer are in contact with each other. There is a concern that blocking phenomenon may occur. However, in the printed polyester film of the present invention, since a rough surface-like portion is formed on the surface of the thermosetting overcoat layer, it becomes easy to peel even when contacted as described above, and blocking when wound up The phenomenon can be further prevented.

  In the printed polyester film of the present invention, in order to scatter light incident on the printed polyester film, the thermosetting overcoat layer has a rough surface shape with an arithmetic average surface roughness Ra in the range of 0.08 to 0.5 μm. It is preferable to provide a part.

  When the arithmetic average surface roughness Ra of the rough surface portion is less than 0.08 μm, it is difficult for incident light to be scattered, and it becomes difficult to express a matte tone for an image or a design by the printed layer. is there. On the other hand, when the arithmetic average surface roughness Ra of the rough surface portion exceeds 0.5 μm, the inorganic particles or the organic particles are not sufficiently covered with the thermosetting overcoat layer, and cans or between the cans are transported. Sliding with the device is insufficient, and it becomes easy to be damaged.

  Therefore, according to the printed polyester film provided with this configuration, it is possible to achieve both a matte expression and ensure the slipperiness of the can body to prevent the surface of the can body from being damaged.

  In the printed polyester film of the present invention, the inorganic particles or organic particles protrude from the surface of the resin composition layer, and the arithmetic average surface roughness Ra of the rough surface portion is within the above range. It is preferable to have an average particle diameter in the range of 5 to 5 μm.

  When the average particle size of the inorganic particles or organic particles is less than 1.5 μm, it may be difficult to protrude from the surface of the resin composition layer, and the arithmetic average surface roughness Ra of the rough surface portion may be It may be less than 0.08 μm.

  On the other hand, when the average particle diameter of the inorganic particles or organic particles exceeds 5 μm, it may be difficult to cover the surface with the thermosetting overcoat layer because it protrudes too much from the surface of the resin composition layer. The arithmetic average surface roughness Ra of the part may exceed 0.5 μm.

  In the printed polyester film of the present invention, the resin composition is used in order that the inorganic particles or the organic particles protrude from the surface of the resin composition layer and the arithmetic average surface roughness Ra of the rough surface portion is in the range. In the resin composition forming the physical layer, 10 to 30 parts by mass of the inorganic particles or organic particles are dispersed with respect to 100 parts by mass of the resin solid content, and the resin composition layer excludes the inorganic particles or organic particles. It is preferable that the thickness of the resin composition alone is in the range of 1 to 2 μm, and the thickness of the thermosetting overcoat layer is in the range of 1 to 2 μm.

  The amount of the inorganic particles or organic particles dispersed in the resin composition is less than 10 parts by mass with respect to 100 parts by mass of resin solids, or the thickness of only the resin composition of the resin composition layer exceeds 2 μm. In some cases, it may be difficult for the inorganic particles or organic particles to protrude from the surface of the resin composition layer, and the arithmetic average surface roughness Ra of the rough surface portion may be less than 0.08 μm. In order to maintain the arithmetic average surface roughness Ra of the rough surface portion at 0.08 μm or more when the thickness of the thermosetting overcoat layer exceeds 2 μm, the average particle of the inorganic particles or organic particles is used. The diameter of the resin composition layer and the thickness of only the resin composition of the resin composition layer must be very thin, which makes it difficult to manufacture.

  On the other hand, the content of the inorganic particles or the organic particles dispersed in the resin composition exceeds 30 parts by mass with respect to 100 parts by mass of the resin solid content, or the thickness of only the resin composition of the resin composition layer Is less than 1 μm, the inorganic particles or the organic particles may protrude too much from the surface of the resin composition layer, and the arithmetic average surface roughness Ra of the rough surface portion may exceed 0.5 μm. When the thickness of the thermosetting overcoat layer is less than 1 μm, it becomes difficult to coat the inorganic particles or organic particles of the resin composition layer containing the matting component, and the physical chemistry from the outside The layer under the thermoset overcoat layer cannot be protected from mechanical impact.

  Moreover, the printed polyester film of this invention WHEREIN: The resin composition which forms the said resin composition layer may contain the pigment. When the resin composition contains a pigment, an image, a design, or the like can be formed on the opposite side of the printed layer of the printed polyester film, and various image / design expressions can be performed together with the printed layer.

  The printed polyester film-coated can body of the present invention is a printed polyester film-coated can body having a protective coating layer made of a printed polyester film on the outer surface side of the can body, and the printed polyester film is a polyester serving as a substrate. A printed layer made of a resin composition containing a pigment provided on one surface of the film, a thermosetting resin-based adhesive layer provided on the printed layer, and the other surface of the polyester film serving as the substrate A resin composition layer comprising a resin composition in which inorganic particles or organic particles are dispersed, and the inorganic particles or organic particles provided on the resin composition layer and protruding from the surface of the resin composition layer. A thermosetting overcoat layer having a rough surface portion formed by coating, and the protective coating layer is formed on the outer surface side of the can body portion with the printed polyester film. There, characterized in that it is thermally bonded through a heat-curable resin based adhesive layer.

  The printed polyester film-coated can body is, for example, a strip in which the polyester film is heated and bonded via the thermosetting resin-based adhesive layer to a portion excluding both side edge portions on the side that becomes the outer surface of the can body portion. It may be formed by rounding a metal plate for can body material and overlapping and welding the two side edge portions, and formed by drawing or ironing the metal plate for can body material The printed polyester film may be heat-bonded to the side of the bottomed cylindrical body that becomes the outer surface of the can body portion through the thermosetting resin adhesive layer.

  The polyester film-coated can body is a cylindrical body in the case where it is formed by superimposing both side edge portions of the metal plate for the strip-shaped can body material and welding and joining, and is separately manufactured at the open end portion. A three-piece welded can body can be formed by double winding the can lid.

  In addition, when the polyester film-coated can body is a bottomed cylindrical body formed by drawing or ironing the metal plate for can body material, a two-piece can body can be formed.

  When the printed polyester film is heated and bonded to the outer surface of the bottomed cylindrical body, the printed polyester film-coated can body is provided on the other surface of the polyester film serving as a base. The resin composition layer and the thermosetting overcoat layer to be formed may be provided after the printed polyester film is bonded to the bottomed tubular body by heating.

  The printed polyester film-coated can body of the present invention is provided with a protective coating layer made of the printed polyester film of the present invention on the outer surface side of the can body portion, so that a mat-like image / design expression can be performed and a substrate can be obtained. The dimensional stability of the polyester film, the scratch resistance due to impact from the outer surface of the film, and the slipperiness between the cans can be ensured.

Explanatory sectional drawing which shows the example of 1 structure of the printed polyester film which concerns on this invention. Explanatory sectional drawing of the metal plate for can body materials to which the printing polyester film which concerns on this invention was adhere | attached. Explanatory sectional drawing which shows the principal part of the can body part of the 3 piece welded can which concerns on this invention. Explanatory sectional drawing which shows the structure of the 2 piece can body which concerns on this invention.

  Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

  The printed polyester film 1 of this embodiment shown in FIG. 1 is bonded to a metal plate for a can body material to form a protective coating layer. The printed polyester film 1 includes a printed layer 3 made of a resin composition containing a pigment on one surface of a polyester film 2 serving as a base, and a thermosetting resin adhesive layer 4 provided on the printed layer 3. It has. The printed polyester film 1 has a resin composition layer 5 made of a resin composition containing inorganic particles or organic particles, and heat provided on the resin composition layer 5 on the other surface of the polyester film 2 serving as a base. And a cured overcoat layer 6.

  In the resin composition layer 5, inorganic particles or organic particles (hereinafter simply referred to as particles 7) protrude from the surface.

  The thermosetting overcoat layer 6 is provided on the particles 7 protruding from the surface of the resin composition layer 5 dispersed, and other than the protrusions and particles 7 formed by the particles 7 protruding from the surface of the resin composition layer 5. The surface is provided with a rough surface portion 8 formed by unevenness with the concave portion by the resin composition.

  Next, as the polyester film 2 serving as a substrate, a polyester film obtained by polycondensation of a dicarboxylic acid component and a diol component and having excellent strength and transparency is suitable. Examples of polyesters that can be used as materials for such films include polyesters obtained by polycondensation of aromatic dicarboxylic acids such as naphthalene dicarboxylic acid, terephthalic acid, and isophthalic acid with diols such as ethylene glycol, propylene glycol, and butylene glycol. Can be mentioned. The polyester is preferably a polyester (polyethylene naphthalate) obtained by polycondensation of naphthalenedicarboxylic acid and ethylene glycol or a polyester (polyethylene terephthalate) obtained by polycondensation of terephthalic acid and ethylene glycol.

  The polyester film 2 serving as a substrate may be subjected to surface oxidation treatment such as corona discharge in order to improve the adhesive strength between the printing layer 3 and the resin composition layer 5.

  Moreover, it is preferable that the polyester film 2 used as a base | substrate has the thickness of the range of 5-50 micrometers. When the thickness of the polyester film 2 serving as a substrate is less than 5 μm, the printed polyester film 1 is damaged when the metal plate for can body material on which the protective coating layer is formed by the printed polyester film 1 is processed into a can body. It is easy, pinholes etc. generate | occur | produce and the protective coating effect of a can may not fully be acquired. Further, when the thickness of the polyester film 2 serving as the substrate exceeds 50 μm, the residual stress increases, and when the can body is subjected to a drawing process such as a neck-in process when the can body is processed, There exists a tendency for the adhesiveness with respect to the metal plate for can body materials to fall.

  Furthermore, the polyester film 2 serving as a substrate is required to have strength for providing the printing layer 3 and the resin composition layer 5 and dimensional stability against heat treatment when bonded to the metal plate for can body material. Therefore, the polyester film 2 serving as a substrate is preferably a heat-resistant polyester film such as polyethylene naphthalate, a uniaxially or biaxially stretched polyethylene terephthalate film, or the like. In particular, the polyester film 2 serving as a substrate is biaxially stretched with a material physical property of heat shrinkage in the longitudinal direction of 1.2% or less and heat shrinkage in the width direction of 0% when held at 150 ° C. for 30 minutes. A polyester film is preferred.

  Next, the printing layer 3 is made of a resin composition containing a pigment, and is formed on one surface of the polyester film 2 serving as a substrate by, for example, gravure printing. As the pigment, a conventionally known pigment can be used, and a pearl pigment or a pigment containing metal powder, such as a silver pigment, may be used.

  As the resin composition, a conventionally known resin composition used for gravure printing or the like can be used. Examples of such a resin composition include a resin composition composed of an epoxy butyral resin and a polyisocyanate resin, or a resin composition composed of a polyester polyurethane resin and a polyisocyanate resin.

  The printing layer 3 includes a first printing layer (not shown) made of a resin composition containing a general-purpose pigment or a pearl pigment excluding a pigment containing a metal powder, and a resin composition containing a pigment containing a metal powder. And a second printing layer (not shown). In this case, a first printed layer is first formed on the polyester film 2 serving as a base, and a second printed layer is formed on the first printed layer.

  Next, the thermosetting resin adhesive layer 4 is formed by being applied on the printing layer 3. The thermosetting resin-based adhesive layer 4 includes a thermosetting resin-based adhesive composition containing a polyester resin and an aminoplast resin or a polyisocyanate resin, or a polyester resin and a blocked isocyanate compound or an internal blocked isocyanate compound. It can be formed by a thermosetting resin adhesive composition or the like. Moreover, the thermosetting resin adhesive layer 4 may contain a metal powder.

  In order to make the printed image / design clear, a white ink layer may be provided by printing the entire surface of the white ink between the thermosetting resin-based adhesive layer 4 and the printing layer 3. As the white ink layer, a known layer called a so-called white presser can be used.

  Next, the resin composition layer 5 is made of a resin composition in which particles 7 are dispersed, and is formed on the surface opposite to the printed layer 3 of the polyester film 2 serving as a base, that is, on the surface side by, for example, gravure printing. The

  Examples of the inorganic particles include calcium carbonate, magnesium carbonate, calcium phosphate, apatite, barium sulfate, calcium fluoride, talc, mica, kaolin, silicon oxide (silica), alumina, titanium dioxide, zirconium oxide, iron oxide, and alumina / silica composite. Examples thereof include oxides and aluminum borate.

  The organic particles include polystyrene, polymethacrylic acid ester, polyacrylic acid ester, benzoguanamine / formaldehyde condensate, benzoguanamine / melamine / formaldehyde condensate, a copolymer thereof, or a crosslinked product thereof. Can be mentioned.

  The inorganic particles or organic particles preferably have an average particle size in the range of 1.5 to 5 μm. The said inorganic particle or organic particle may be used independently, and 2 or more types may be mixed and used for it.

  As the resin composition, a conventionally known resin composition used for gravure printing or the like can be used. Examples of such a resin composition include a resin composition composed of an epoxy butyral resin and a polyisocyanate resin, or a resin composition composed of a polyester polyurethane resin and a polyisocyanate resin.

  The resin composition layer 5 includes 10 to 30 parts by mass of the inorganic particles or organic particles with respect to 100 parts by mass of the resin solid content, and the resin composition layer includes the inorganic particles or organic particles. It is preferable that only the resin composition excluding the particles has a thickness in the range of 1 to 2 μm. As a result, the resin composition layer 5 can be configured such that the inorganic particles or organic particles protrude from the surface thereof.

  Moreover, the resin composition layer 5 may consist of a resin composition containing a pigment. As the pigment, conventionally known pigments can be used, and pearl pigments or metal powders such as silver pigments may be used.

  In addition, as shown in FIG. 1, the resin composition layer 5 may be provided on the entire surface of the polyester film 2 serving as a base, and partially on a portion corresponding to a specific portion of the design of the printing layer 3. It may be provided (not shown).

  Next, the thermosetting overcoat layer 6 is made of a thermosetting resin, is formed on the resin composition layer 5, and covers the particles 7 protruding from the surface of the resin composition layer 5. As a result, the thermosetting overcoat layer 6 has a configuration in which a rough surface portion 8 formed by unevenness of the particles 7 is provided on the surface.

  A conventionally well-known thing can be used for the thermosetting resin which forms the thermosetting overcoat layer 6. FIG. Examples of such thermosetting resins include epoxy resins and aminoplast resins, and other polyester resins can be used in combination. In particular, according to the polyester film 1 having this configuration, since it is not necessary to disperse and mix the particles 7 in the thermosetting resin, the resin composition to be used is the dispersion stability of the matte component or printing on a predetermined site. Therefore, there is no need to consider printability and the like.

  Moreover, what added inorganic acids, such as organic acid or phosphoric acid, polyphosphoric acid, is suitable as a short time curing catalyst so that a coating hardening layer can be formed in high temperature for a short time. Further, the thermosetting resin preferably contains silicon or wax in order to improve the scratch resistance and the slipperiness of the thermosetting overcoat layer 6. In addition, it is preferable that the said thermosetting overcoat layer 6 is equipped with the thickness of the range of 1-2 micrometers.

  According to the thermosetting overcoat layer 6 having this configuration, a suitable resin composition can be used without considering the problems of dispersion stability of the particles 7 and printability. Therefore, when the polyester film 2 on which the thermosetting overcoat layer 6 is formed is used to form a protective coating layer for a printed polyester film-coated can described below, the slipperiness of the polyester film-coated can can be improved. In addition, the scratch resistance can be improved.

  In the thermosetting overcoat layer 6, the rough surface portion 8 formed by the particles 7 preferably has an arithmetic average surface roughness Ra in the range of 0.08 to 0.5 μm.

  According to the rough surface-shaped portion 8 configured so that the arithmetic average surface roughness Ra falls within this range, the surface of the can body is scratched while expressing the matte tone and ensuring the slipperiness of the can body. It is possible to prevent both.

  The printed polyester film 1 of this embodiment can be manufactured as follows, for example.

  First, as described above, a heat treatment is applied to the polyester film 2 which is a long substrate by cutting the raw film every predetermined width to relieve the residual stress.

  Next, the printed layer 3 is formed on the side to be bonded to the metal plate of the polyester film 2 as the base, that is, the back side, and then the resin composition layer 5 is formed on the side opposite to the printed layer 3, that is, the front side. Form. And the polyester film 2 used as a base | substrate is wound up and stored along a length direction. At this time, since the inorganic particles or organic particles protrude from the surface of the resin composition layer 5, the printing layer 3 and the resin composition layer 5 adhere to each other in the state of being wound up as described above, thereby causing a blocking phenomenon. Can be prevented.

  Next, the polyester film 2 serving as the substrate wound as described above is pulled out, and a thermosetting overcoat layer 6 is formed on the resin composition layer 5. And the polyester film 2 used as the base | substrate with which the thermosetting overcoat layer 6 was formed is wound up along the length direction, and is stored. At this time, since the thermosetting overcoat layer 6 is heated and cured, the printing layer 3 and the thermosetting overcoat layer 6 are less likely to adhere to each other and cause a blocking phenomenon as compared with the resin composition layer 5. However, since the rough surface portion 8 is provided on the surface, it can be prevented more reliably.

  Next, the printed polyester film 1 of the present embodiment is formed by drawing out the polyester film 2 as the substrate wound up as described above and forming the thermosetting resin adhesive layer 4 on the printed layer 3. Complete. The printed polyester film 1 is wound and stored along the length direction, and is used for the purpose of adhering to a metal plate for a can body material and forming a protective coating layer.

  Also at this time, since the thermosetting overcoat layer 6 has the rough surface portion 8 on the surface, the blocking phenomenon with the thermosetting resin-based adhesive layer 4 can be prevented.

  Next, the printed polyester film-coated can body of the present embodiment using the printed polyester film 1 will be described.

  The printed polyester film-covered can body of the present embodiment is formed by, for example, rounding a metal plate for a strip-shaped can body material on which the printed polyester film 1 is heat-bonded via a thermosetting resin adhesive layer 4 and both sides thereof. It is a welding can body formed by superposing end edges and welding them together.

  The welded can is formed from a metal plate 11 for can material shown in FIG. The metal plate 11 for can body material has a printed polyester film 1 shown in FIG. 1 with a thermosetting resin adhesive layer 4 interposed between the side edges 11a and 11a on the outer surface side of the can body material. The protective coating layer 12 is formed by heat bonding. In FIG. 2, the printed polyester film 1 is shown with the printing layer 3, the resin composition layer 5, and the thermosetting overcoat layer 6 omitted.

  Moreover, the transparent polyester film 13 is the same thermosetting resin adhesive layer as the polyester film 1 in the part except the both side edge parts 11a and 11a of the side used as the can inner surface of the metal plate 11 for can body materials. The inner surface protective coating layer 15 is formed by heat bonding via 14.

  The polyester film 13 is suitably a polyethylene terephthalate film from the viewpoint of suitability for the process of coating the metal plate 11 for can body material and the quality of the can when the welded can body is formed.

  As the metal plate 11 for the can body material, a tin-plated steel plate, a tin-free steel plate, an aluminum plate, a surface-treated metal plate with various surface treatments applied thereto, and a plastic film coated on the surface or a resin coating Can be mentioned.

  The metal plate 11 for can body material on which the protective coating layer 12 and the inner surface protective coating layer 15 are formed is rolled as shown by an arrow in FIG. 2, and both side edge portions 11a and 11a are overlapped as shown in FIG. The can body 16 is formed by welding. The portion of the can body portion 16 where the protective coating layer 12 and the inner surface protective coating layer 15 are not formed is covered with a known coating correction coating 17. And after carrying out the neck-in process and the flange process of the both-ends edge part of the can body part 16, it can be set as a 3 piece welded can body by carrying out double winding of the can lid manufactured separately.

  In addition, the printed polyester film-coated can body of the present embodiment is, for example, printed polyester on the side that becomes the outer surface of the can body portion of the bottomed cylindrical body formed by drawing or ironing the metal plate for can body material. A two-piece can body in which the film 1 is heat-bonded via a thermosetting resin adhesive layer 4 may be used.

  The two-piece can body to which the printed polyester film 1 is heat-bonded is manufactured by completing the printed polyester film 1 and then heat-bonding the printed polyester film 1 to the outer surface of the bottomed tubular body. Alternatively, the printed polyester film 1 in which the printed layer 3 and the thermosetting resin adhesive layer 4 are formed on the back surface side of the polyester film 2 serving as the substrate and the resin composition layer 5 is formed on the front surface side may be a bottomed cylinder. You may manufacture by forming a thermosetting overcoat layer, after heat-adhering to the side used as the can body part outer surface of a cylindrical body.

  A two-piece can body 21 shown in FIG. 4 is formed from a bottomed cylindrical body 23 obtained by drawing or ironing a metal plate 22 for can body material. The metal plate 22 for can body material can use the metal plate 11 for can body material. The metal plate 22 for can body material may have a polyester film bonded to the surface. Moreover, you may use the tin free steel plate which coat | covered the polyester films 24 and 25 on both surfaces.

  As shown in FIG. 4 (b), the bottomed cylindrical body 23 has a protective coating layer in which the printed polyester film 1 is heated and bonded to the outer surface of the can body portion through a thermosetting resin adhesive layer 4. Is formed into a two-piece can body 21. The two-piece can body 21 is subjected to neck-in processing 26 and flange processing 27 at the opening after the formation of the protective coating layer.

  As the polyester film 24 bonded to the inner surface side of the two-piece can body 21, the same polyester film 13 used for the welded can body can be used in the same manner as the polyester film 13.

  DESCRIPTION OF SYMBOLS 1 ... Printing polyester film, 2 ... Polyester film used as a base | substrate, 3 ... Printing layer, 4 ... Thermosetting adhesive layer, 5 ... Resin composition layer, 6 ... Thermosetting overcoat layer, 7 ... Particle | grains, 11 and 22 ... Metal plate for can body material, 12 ... Protective coating layer, 16, 21 ... Printed polyester film coated can body.

Claims (9)

A printed polyester film that is heat-bonded to a metal plate for a can body material or a bottomed cylindrical can body through a thermosetting resin adhesive layer to form a protective coating layer,
A printed layer made of a resin composition containing a pigment provided on one surface of a polyester film as a substrate;
A thermosetting resin adhesive layer provided on the printed layer;
A resin composition layer comprising a resin composition provided on the other surface of the polyester film serving as a substrate and having inorganic or organic particles dispersed therein;
A thermosetting overcoat layer having a rough surface portion provided on the resin composition layer and formed by coating the inorganic particles or organic particles protruding from the surface of the resin composition layer. Printed polyester film featuring. The printed polyester film according to claim 1, wherein the resin composition layer is provided on a part of the other surface of the polyester film serving as a base,
The thermosetting overcoat layer is provided on the resin composition layer and on a portion of the other surface of the polyester film where the resin composition layer is not provided. .   3. The printed polyester film according to claim 1, wherein the thermosetting overcoat layer includes a rough surface portion having an arithmetic average surface roughness Ra in a range of 0.08 to 0.5 μm. Print polyester film.   The printed polyester film according to any one of claims 1 to 3, wherein the inorganic particles or the organic particles have an average particle diameter in the range of 1.5 to 5 µm.   The printed polyester film according to any one of claims 1 to 4, wherein the resin composition forming the resin composition layer is 10 to 30 parts by mass of the inorganic particles or 100 parts by mass of the resin solid content. Organic particles are dispersed, the resin composition layer has a thickness of only the resin composition excluding the inorganic particles or organic particles in the range of 1 to 2 μm, and the thickness of the thermosetting overcoat layer is A printed polyester film characterized by being in the range of 1 to 2 μm.   The printed polyester film according to any one of claims 1 to 5, wherein the resin composition forming the resin composition layer contains a pigment. A printed polyester film-coated can body comprising a protective coating layer made of a printed polyester film on the outer surface side of the can body,
The printed polyester film comprises a printed layer made of a resin composition containing a pigment provided on one surface of a polyester film serving as a substrate, a thermosetting resin adhesive layer provided on the printed layer, A resin composition layer comprising a resin composition provided on the other surface of a polyester film serving as a substrate and having inorganic or organic particles dispersed therein, and a surface of the resin composition layer provided on the resin composition layer A thermosetting overcoat layer having a rough surface formed by coating the inorganic particles or organic particles protruding from,
The printed polyester film-coated can body, wherein the protective coating layer made of the printed polyester film is heat-bonded to the outer surface of the can body portion through the thermosetting resin adhesive layer. In the printed polyester film-coated can body according to claim 7,
A metal plate for strip-shaped can body material, in which the printed polyester film is heated and bonded via the thermosetting resin adhesive layer to the portion excluding both side edge portions on the side that becomes the outer surface of the can body portion, is rolled up. A printed polyester film-coated can body, wherein both side edge portions are overlapped and welded together. In the printed polyester film-coated can body according to claim 7,
The printed polyester film is heated and bonded via the thermosetting resin-based adhesive layer to the outer surface of the can body portion of a bottomed cylindrical body formed by drawing or ironing a metal plate for a can body material. A printed polyester film-coated can body characterized by being made.

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