Laminating apparatus

Abstract

To provide a laminating apparatus 100 capable of arranging a waterproof layer on the surface of a paper container.SOLUTION: There is provided a laminating apparatus 100 comprising heating means 110 for heating a resin film S, film holding means (holding means 130) for holding the resin film S, and vacuum suction means 140 for performing covering and molding of the resin film S on the surface of a base material B, in which the laminating apparatus has a shutter device 120 which is disposed between the heating means 110 and the resin film S held by the holding means 130 and is divided from a central part as heat shielding means to be opened / closed. The shutter device 120 is controlled to be open when the resin film S held by the holding means 130 is heated by the heating means 110, and is controlled to be closed when the resin film S is brought into close contact with the surface of the base material B by the vacuum suction means or air compressing means and the resin film S is welded onto the surface of the base material B.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a laminating device having a function of attaching a resin film to the surface of a paper container or the like. [Background technology]

[0002] In light of the current situation, the use of paper containers has been reconsidered. However, when paper containers are used to replace the plastic containers that have been used up until now, problems such as leakage must be solved. As a measure against leakage, the paper container may be laminated to prevent leakage.

[0003] Patent Document 1 discloses a technology relating to a heat-insulating paper container and a raw material sheet used for the heat-insulating paper container. The raw material sheet used for the heat-insulating paper container is a raw material sheet having a thermoplastic resin layer formed on at least one side of a paper base material, and the paper base material contains 0.3 g / m of hydroxycarboxylic acid or its metal salt. 2 More than 6.0g / m 2 By using the raw material sheet containing the following, a paper container with excellent heat insulation properties can be provided.

[0004] Patent Document 2 discloses a technology relating to waterproof paper and its manufacturing method. By having a paper base material, an undercoat layer containing fine cellulose fibers with a fiber diameter of 60 μm or less provided on at least one side of the paper base material, and a waterproof layer containing a styrene-acrylic resin and wax provided as the outermost layer on the undercoat layer, it is possible to manufacture paper that is moisture-proof and waterproof. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2009-83202 A [Patent Document 2] JP 2023-59450 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, the technologies described in Patent Documents 1 and 2 are both technologies for providing a waterproof layer on the surface of a flat paper base material, and it is difficult to provide a waterproof layer on the surface of a paper container that has a three-dimensional shape after thermoforming. In addition, there is a demand for using folding paper boxes, but when a waterproof layer is provided on a flat paper base material and then the paper base material is folded three-dimensionally to form a folding paper box, there is a problem of leakage from gaps, and a method has been proposed to seal these parts using an adhesive or the like, but this is costly and difficult to completely prevent leakage.

[0007] In recent years, the demand for paper containers such as pulp molded products and paper folding boxes has been increasing, and in order to provide a waterproof layer for such products, a technology has been developed in which an adhesive layer is provided on the back side of a laminate film and then attached, but providing an adhesive layer also creates problems. From an environmentally friendly perspective, it is desirable to make the laminate film as thin as possible, and providing an adhesive layer is undesirable because it affects recycling and increases costs. For this reason, new methods of providing waterproofing that can be used for paper containers are being sought.

[0008] Therefore, an object of the present invention is to provide a laminating device that can provide a waterproof layer on the surface of a paper container. [Means for solving the problem]

[0009] In order to achieve the above object, a laminator according to one aspect of the present invention has the following features.

[0010] (1) A laminating apparatus including a heating means for heating a resin film, a film holding means for holding the film, and a vacuum suction means or a compressed air means for coating the film on a surface of a substrate, a shutter device that is divided at a center portion and opens and closes as a heat shielding means and is disposed between the heating means and the film held by the film holding means; The shutter device is When the film held by the film holding means is heated by the heating means, the film holding means is controlled to an open state, The film is brought into close contact with the surface of the substrate by the vacuum suction means or the compressed air means, and when the film is fused to the surface of the substrate, an open state or a closed state is selected and controlled; It is characterized by:

[0011] According to the embodiment described in (1) above, by using a shutter device that opens and closes by dividing it from the center in the laminating device, it is possible to quickly block the transfer of heat from the heating means to the film. The film is heated using, for example, a hot plate or a radiant heating means, but even with a radiant heating means that has a relatively fast temperature rise rate, it takes some time for the effect (heating) on ​​the film to disappear after the heating is turned off.

[0012] However, by adopting a configuration that can block the transfer of heat from the heating means to the film using a shutter device, it is possible to quickly block the influence of the heating means. As a result, when a thin film is used to cover the surface of a substrate, the occurrence of drawdown of the film due to overheating can be suppressed, thereby suppressing defects such as the occurrence of wrinkles, which ultimately leads to improved production efficiency and stable quality. In addition, when additional heating is required for the purpose of increasing adhesion to a mold or substrate, the shutter device can be opened to heat the film. In this case, since the heating can be switched by opening and closing the shutter device, the film can be quickly transferred to an overheated state, which contributes to shortening the processing time.

[0013] (2) In the laminating apparatus according to (1), The shutter device is When the film is heated, the heating means is selectively controlled to be in an open state or a closed state until the heating means reaches a target temperature; is preferred.

[0014] According to the embodiment described in (2) above, the shutter device is controlled in a closed state until the heating means reaches the target temperature, so that overheating of the film can be suppressed. Since the temperature rise time of the heating means may have an adverse effect when controlling the temperature of the film, the temperature effect on the film can be adjusted by opening and closing the shutter device. In addition, it is also possible to heat the film by opening it as necessary. As a result, it is possible to suppress the occurrence of drawdown of the film due to overheating, similar to the effect described in (1). In addition, by applying the necessary heat, it is possible to improve the adhesion of the film to the mold and the substrate.

[0015] (3) In the laminating apparatus according to (1) or (2), the shutter device has a telescopic structure and opens to the front and rear in the film feed direction; is preferred.

[0016] The aspect described in (3) above allows the shutter device to be fitted more snugly. The shutter device has the effect of blocking heat so that the film is not overheated when the heating means heats the film. Therefore, it is desirable for the shutter device to be as compact as possible when in the open state so as not to block the space between the heating means and the film. Therefore, by adopting a telescopic structure for the shutter, the shutter device fits more snugly in the open state, which contributes to making the device more compact.

[0017] (4) In the laminating apparatus according to any one of (1) to (3), The substrate is a pulp molded container or a paper folding box; is preferred.

[0018] According to the embodiment described in (4) above, it is possible to attach a waterproof resin film to the surface of a pulp molded container or a paper folding box. By making an environmentally friendly paper container waterproof, it becomes easier to use it as, for example, a food tray. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is an explanatory diagram of a schematic configuration of a laminating device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view of a substrate in the present embodiment. [Diagram 3] FIG. 2 is a cross-sectional view of the product of the present embodiment. [Figure 4] FIG. 2 is a plan view of a shutter device according to the embodiment. [Diagram 5] FIG. 2 is a side view of the shutter device according to the embodiment. [Figure 6] 1A and 1B are diagrams illustrating the operation of the shutter device in this embodiment, in which (A) shows the shutter device in a closed state, (B) shows the shutter device in the middle of opening, and (C) shows the shutter device in an open state. [Figure 7] 1A and 1B are schematic diagrams showing the lamination procedure of this embodiment, in which (A) shows the resin film in an overheated state, (B) shows the shutter device in a closed state, and (C) shows the state in which lamination molding is being performed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] First, an outline of the configuration of a laminating apparatus 100 according to an embodiment of the present invention will be described. Fig. 1 is an explanatory diagram illustrating the outline of the configuration of the laminating apparatus according to this embodiment. The laminating apparatus 100 comprises a heating means 110 for heating a resinous film S, a lifting platform 150 for fixing and raising and lowering a substrate B, and a shutter device 120 disposed between the heating means 110 and the resinous film S. The laminating apparatus 100 holds the resinous film S to be molded, and heats it with the heating means 110 disposed on the upper side to adhere the resinous film S to the surface of the substrate B.

[0021] The resin film S is a film used for lamination to impart waterproofing to the base material B, and adopts a transparent polypropylene (PP) film material made of thermoplastic resin. According to the JIS standard, a film is defined as a plastic film having a thickness of less than 250 μm, but in this embodiment, it is assumed that the resin film S has a thickness of about 20 μm. This resin film S only needs to be able to impart waterproofing by being attached to the surface of the base material B, and the thickness can be changed as necessary. In addition, the resin film S is not limited to a PP film, but is preferably a resin that is thermoplastic, has good adhesion to paper containers, and can impart waterproofing.

[0022] FIG. 2 shows a perspective view of the substrate. FIG. 3 shows a cross-sectional view of the product. The substrate B is a paper package such as a pulp molded container, and a plurality of containers are arranged on a tile as shown in FIG. 2. Then, as shown in FIG. 3, a resin film S is attached to the surface of the substrate B to obtain a product 50. The product 50 is a paper package to which a resin film S is attached, the resin film S providing waterproof performance, and is, for example, a food container such as a curry container. However, the present invention is not limited to food containers and can be widely applied.

[0023] Such a substrate B is held on a lifting platform 150 equipped with a lifting mechanism (not shown) capable of raising and lowering to any height. A resin film S held by a holding device 130 is placed on the upper part of the substrate B. The resin film S is configured to be unwound from a roll and held, and is fed from left to right on the paper surface of FIG. 1. This configuration may be changed as necessary. For example, the resin film S may be cut into a rectangle, placed in a frame, and fed.

[0024] 1, the heating means 110 is a group of heaters 111 that are arranged above the resinous film S and perform radiative heating for the purpose of heating the resinous film S from above, and is composed of a plurality of heaters 111 arranged in a tiled pattern. The heating means 110 is held by a lifting device (not shown) and is configured to be movable to any height so that it can be moved closer to or farther away from the resinous film S. Furthermore, the output of each heater 111 can be adjusted as desired.

[0025] A shutter device 120 is disposed below the heating means 110 for the purpose of physically blocking heat from the heating means 110 in a closed state. Fig. 4 shows a plan view of the shutter device. Fig. 5 shows a side view of the shutter device 120. The shutter device 120 is a type that opens at the center and opens separately to the left and right, and includes a first door 121 (121a, 121b) disposed on the center side and a second door 122 (122a, 122b) disposed on the outside thereof. The first door 121 and the second door 122 have a telescopic structure.

[0026] The shutter device 120 is provided in the laminating apparatus 100 so that the opening and closing direction of the shutter device 120 coincides with the feed direction of the resinous film S. Therefore, when the shutter device 120 is in the open state, the first door 121a and the second door 122a are arranged overlapping on the front side in the traveling direction as shown in Fig. 4, and the first door 121b and the second door 122b are arranged overlapping on the rear side in the traveling direction, forming a center-drawn structure. In other words, when the shutter device 120 is in the open state, the shutter device 120 does not prevent the heating means 110 from heating the resinous film S.

[0027] The opening and closing direction of the shutter device 120 may be arranged to coincide with the direction perpendicular to the feed direction of the resin film S, but this would require the width of the laminating device 100, which would increase the size of the housing of the laminating device 100. Therefore, it is preferable to make appropriate decisions when designing.

[0028] Two rodless cylinders 131 are arranged parallel to the feed direction of the resin film S, and are equipped with slide tables 132 that can be moved arbitrarily in the longitudinal direction of the rodless cylinders 131. The first door 121 is fixed to the upper surface of the slide table 132. The rodless cylinders 131 are driven by a supply of compressed air (not shown), and have the function of moving the slide table 132 from the forward end to the backward end. Note that the rodless cylinders 131 may be driven by a mechanism that opens and closes by incorporating an electric motor rather than by compressed air.

[0029] On the other hand, one end of the second door 122 is supported by a roller slide rail 140. Although not shown, the other end on the opposite side is guided by a roller. The roller slide rail 140 is made up of a rail 141 and a slider 142, and the second door 122 is opened and closed by a roller 143 held by the slider 142 moving within the rail 141. Two sliders 142 are provided and fixed to the side surfaces of the second door 122.

[0030] Fig. 6 shows an explanatory diagram of the operation of the shutter device. (A) shows the shutter device in a closed state, (B) shows the shutter device in a state where the shutter device is driven and the first door overlaps the second door, and (C) shows the shutter device in an open state. A rodless cylinder 131 is used to open and close the shutter device 120, and when in the closed state shown in Fig. 4 and Fig. 6(A), there is a slide table 132 at the forward end of the rodless cylinder 131.

[0031] When the slide table 132 is moved to the center, the end 121b1 of the first door 121b attached to the slide table 132 comes into contact with the inner wall of the end face 121b1 of the second door 122b as shown in Fig. 6(B), thereby moving the second door 122b. When the slide table 132 is moved to the rear end of the slide table 132 as shown in Fig. 6(C), the first door 121b and the second door 122b are overlapped. Note that the structure of the shutter device 120 is not limited to this, but it is preferable that the shutter device 120 opens to the left and right from the center of the device, and it is more preferable to adopt a telescopic structure.

[0032] The outline of the configuration of the laminating apparatus 100 according to the present invention has been described above. Next, the procedure for manufacturing the product 50 using the laminating apparatus 100 will be briefly described.

[0033] The lamination procedure is explained in a schematic diagram in Fig. 7. (A) shows the resin film in an overheated state, (B) shows the shutter device in a closed state, and (C) shows the state in which lamination is being performed. First, as shown in Fig. 7(A), the substrate B is placed on the lifting platform 150 of the laminating device 100. Then, the resin film S is held by the holding device 130, and the resin film S is heated by the heating means 110 while the shutter device 120 is in an open state.

[0034] 7(B), when the heated resinous film S reaches a predetermined temperature, the shutter device 120 is closed to physically block heat transfer between the heating means 110 and the resinous film S. Then, the substrate B is brought close to the resinous film S. At this time, the heating means 110 is provided with a lifting mechanism (not shown) and raised, thereby providing a physical distance from the resinous film S and the shutter device 120, without preventing the reduction of the thermal effect on the resinous film S.

[0035] Next, as shown in Fig. 7(C), air is drawn from below the base material B by a vacuum suction means 140, and lamination is performed in such a way that the resin film S is adsorbed to the surface of the base material B. As a result, the resin film S is fused onto the base material B as shown in Fig. 2, and the product 50 is obtained by cutting out the product 50 individually.

[0036] The laminating apparatus 100 of this embodiment has the above-mentioned configuration and therefore provides the following functions and effects.

[0037] First, the effect is that it is possible to provide a laminating apparatus 100 that can provide a waterproof layer on the surface of a paper container. This is because the laminating apparatus 100 includes a heating means 110 for heating a resinous film S, a film holding means (holding means 130) for holding the resinous film S, and a vacuum suction means 140 for coating and forming the resinous film S on the surface of a substrate B, and is characterized in that the laminating apparatus 100 includes a shutter device 120 that is divided from the center and opens and closes as a heat shielding means disposed between the heating means 110 and the resinous film S held by the holding means 130, and the shutter device 120 is controlled to an open state when the resinous film S held by the holding means 130 is heated by the heating means 110, and is controlled to a closed state when the resinous film S is adhered to the surface of the substrate B by a vacuum suction means or compressed air means and the resinous film S is fused to the surface of the substrate B.

[0038] As shown in the problem, when providing a waterproof layer on the surface of a paper container (substrate B), it is preferable to avoid providing an adhesive layer as much as possible, and it is preferable that the resin film S functioning as the waterproof layer is thin. Therefore, by appropriately heating with the heating means 110 and forming on the surface of the substrate B at an appropriate timing using the vacuum suction means 140, it becomes possible to fuse the resin film S to the surface of the substrate B. Here, the heating of the resin film S by the heating means 110 becomes more difficult to control as the thickness of the resin film S becomes thinner. Overheating causes drawdown, which easily leads to wrinkles, gaps, and defects in the product 50.

[0039] Therefore, by providing the shutter device 120 as a heat shielding means, the heat from the heating means 110 to the resinous film S is blocked. In other words, when the shutter device 120 is in an open state with a first door 121 (121a, 121b) and a second door 122 (122a, 122b) arranged on the outside thereof open from the center to the left and right as shown in Figures 1, 1 and 4, it does not block the heat from the heating means 110 to the resinous film S, but can block the heat from being applied to the resinous film S when in a closed state. A rodless cylinder 131 is used to open and close the shutter device 120, so that opening and closing can be done in less than one second.

[0040] In this way, by quickly cutting off the heating by the shutter device 120, it becomes possible to cut off the thermal influence from the heating means 110 in a shorter time than when using conventional means such as cutting off the power supply to the heating means 110, moving the heating means 110 away from the resinous film S, or forcibly cooling it using compressed air. The shutter device 120 has a structure that is opened and closed using a rodless cylinder 131, and can be opened and closed in a short time. Therefore, in order to prevent the resinous film S from being overheated by the heating means 110, the shutter device 120 can be closed quickly, which leads to suppression of overheating.

[0041] Therefore, it becomes easier to control the heating time for the resin film S, and even when a thin resin film S is used, it is possible to suppress the effects of drawdown and the occurrence of pinholes. When welding the resin film S to the substrate B, it is preferable to use a thin resin film S in order to reduce weight and costs. In addition, reducing the amount of resin film S used in the product 50 can lead to an appeal of environmental friendliness.

[0042] In addition, the method of laminating the resin film S by heating and welding it to the substrate B eliminates the need to apply an adhesive to the back surface of the resin film S, which leads to cost reduction and ultimately contributes to the productivity of the product 50.

[0043] When the resinous film S is heated and welded to the substrate B, the shutter device 120 may be opened again to heat the film, thereby improving the adhesion of the film S to the substrate B, and therefore control may be performed not only in the closed state but also in the open state. In this case, a conceivable procedure is to close the film S once after heating it, and then heat it again when the film S comes into contact with the substrate B to improve the adhesion.

[0044] The laminating device 100 according to the present invention has been described above, but the present invention is not limited to this, and various modifications are possible within the scope of the present invention. For example, although PP resin film S is used, it is not precluded to use a resin material having waterproof performance instead. In addition, although the base material B is a pulp molded container, it is not precluded to apply it to a paper folding box. Since a waterproof layer made of resin film S can be provided on the inside of the paper folding box, it is possible to prevent water from entering through the folds. In addition, although it is described that vacuum suction means 140 is used for lamination molding, it is not precluded to use compressed air molding means.

[0045] As for the timing of use of the shutter device 120, an example is shown in which it is used when heating of the resinous film S by the heating means 110 ends, but this does not preclude its use when heating begins. By keeping the shutter device 120 in a closed state when heating means 110 begins to heat, and opening it just before or when heating means 110 has started to heat up, it becomes possible to control the heating time of the resinous film S. It is believed that using a hot plate for the heating means 110 will function effectively when a long heating time is required. [Explanation of symbols]

[0046] S resin film B Base material 100 Laminating device 110 Heating means 120 Shutter device 130 Holding means 140 Vacuum suction means

Claims

1. A laminating apparatus comprising a heating means for heating a resin film, a film holding means for holding the film, and a vacuum suction means or a compressed air means for coating the film on a surface of a substrate, a shutter device that is divided at a center portion and opens and closes as a heat shielding means and is disposed between the heating means and the film held by the film holding means; The shutter device is When the film held by the film holding means is heated by the heating means, the film holding means is controlled to an open state, The film is brought into close contact with the surface of the substrate by the vacuum suction means or the compressed air means, and when the film is fused to the surface of the substrate, the open state or the closed state is selected and controlled; A lamination device characterized by:

2. The laminating apparatus according to claim 1, The shutter device is When the film is heated, the open state or the closed state is selected and controlled until the heating means reaches a target temperature; A lamination device characterized by:

3. The laminating apparatus according to claim 1, the shutter device has a telescopic structure and is opened so as to be separated into a front and a rear in the film feed direction; A lamination device characterized by:

4. The laminating apparatus according to claim 1 or 2, The substrate is a pulp molded container or a paper folding box; A lamination device characterized by:

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