JPH032658B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a method for manufacturing a laminate for honeycomb cores, and more specifically, the present invention relates to a method for manufacturing a laminate for honeycomb cores, and more specifically, the present invention relates to a method for manufacturing a laminate for honeycomb cores. The present invention relates to a method of manufacturing a laminate for a core. [Prior art] Conventionally, as this type of manufacturing method, for example,
The one described in No. 59-13151 is known. That is, as a first conventional technique, as shown in FIG.
The adhesives 5, 5a are applied in a striped pattern at predetermined intervals, and then dried in dryers 6, 6a.
and guide with a guide roll 10 or the like. Then, while pressing the outer periphery of the cylindrical drum 12 with a pressure roll 14, both the strip-shaped materials 2 and 2a are adhered and laminated. In the above device, the cylindrical drum 12 and the coating rolls 4, 4a are further connected by a timing belt or the like,
The rotation ratio of both rolls 12, 4, 4a is set constant. As a result, the winding diameter increases as the strip materials 2, 2a are stacked on the cylindrical drum 12.
The feeding speed of the strip materials 2, 2a becomes faster, and on the other hand,
Since the rotational speed of the applicator rolls 4, 4a is constant, the interval between applications of the adhesive to the strip materials 2, 2a becomes wide. By doing so, as the winding diameter of the cylindrical drum 12 increases, the intervals between adhesive applications become wider, that is, the adhesive of each layer can be arranged radially. The strip materials 2, 2a wound up through the above steps are removed from the cylindrical roll 12 and cut into predetermined lengths, and then stretched in the stretching direction to form a honeycomb core. On the other hand, as a second conventional technique, the winding diameter on the cylindrical drum is detected with a photocell, and this detection signal is processed to reduce the rotational speed of the coating roll 4 to increase the adhesive coating interval. Controls are also known. [Problems to be Solved by the Invention] However, in the first conventional technique, for example, when laminating one strip material 2, the adhesive is applied radially as the winding diameter increases. However, there is a problem in that the relative application position of the adhesive to the other strip material 2a shifts as the winding diameter increases. On the other hand, the second conventional technique has a problem in that a complicated arithmetic processing device must be used to control the rotation speed of the application roll. The present invention has been made in order to solve the problems of the above-mentioned conventional technology, and provides a method for manufacturing a honeycomb core laminate that does not require complicated equipment and can obtain a honeycomb core of a desired shape. With the goal. [Means for Solving the Problems] The present invention, which has been made to achieve the above object, is to coat one or both sides of a plurality of strip-shaped materials perpendicularly to the moving direction of the materials using separate application rolls. In the method of manufacturing a honeycomb core, the adhesive is applied in a striped pattern, and after application, the adhesive is passed through a predetermined route, and a plurality of strip-shaped materials are laminated and bonded to each other while being wound around the same cylindrical drum. The present invention is characterized in that the rotation ratio of the roll and the cylindrical drum is set to be fixed, and the course lengths of the respective strip-shaped materials are set to be the same. The band-shaped material in the present invention includes materials commonly used as base materials for honeycomb cores, such as metal foils such as aluminum foil and iron foil, paper such as paperboard, resin-impregnated paper, and synthetic paper, polyethylene, A wide range of materials can be used, including sheets of plastics such as polypropylene and fiber reinforced versions thereof.
In the present invention, the band-like material is generally made of a single material due to the characteristics of the honeycomb core and from the viewpoint of manufacturing, but it is also possible to use a combination of various materials. The adhesive used in the present invention may be a thermoplastic or thermosetting adhesive that is dissolved or dispersed in water or other solvents, or in the form of a so-called hot melt type adhesive in powder or solid form, or in a solvent-free liquid form. Any resin can be used as long as it can be applied to a strip-shaped material and then dried or preheated to form a film, and after the materials are laminated, the two materials can be bonded by heating and pressing. . Preferred adhesives for the present invention are those made of thermoplastic or thermosetting resins such as epoxy-based adhesives such as epoxy-phenol, epoxy-nylon, and epoxy-nitrile, nylon-based, polyester-based, and polyolefin-based adhesives.
When these are used, adhesion that provides sufficient performance as a honeycomb core can be easily achieved. The applicator roll for applying the adhesive to the strip-shaped material can be selected depending on the shape and characteristics of the adhesive. It is best to use a roll whose surface has been processed so that it can be applied repeatedly, with a constant coating width at parallel intervals and with a constant pattern. . In addition, in the present invention, it is also possible to apply a primer to the material as necessary before applying the adhesive, and depending on the material, the adhesive effect may be improved.
You can demonstrate even more. In the present invention, adhesive is applied to one or both sides of the strip-shaped material parallel to the width direction, but the application width, application pitch, and pattern of the adhesive are determined depending on the shape of the final product, the honeycomb core. It depends on what you do, and we are open to any response. For example, as shown in the cross-sectional views of FIG. 2 and FIG.
Honeycomb cores as shown in FIGS. 4 to 6 can be obtained from a laminate consisting only of 2a. Alternatively, adhesive may be applied to both sides of the strip material. Generally, from the standpoint of appearance, strength, and productivity, a regular hexagon or a series of identical shapes are required, so in that case, the following spacing and width should be selected. preferable. In other words, when using a strip material that has adhesive applied to both sides and alternately coated on the front and back surfaces in a striped pattern and a strip material that is not coated with adhesive, the application position through both the front and back surfaces is It is preferable that they all be spaced at regular intervals, in other words, that they are laminated so that the adhesive application position on the back side is located on the back side exactly halfway between the two adhesive application positions located at regular intervals on the front surface. On the other hand, a strip material 102, 102 as shown in FIG. 2 with adhesive 100 applied only on one side.
Even when only a is used, the application position of the adhesive 100 on one strip-shaped material 102 is the same as that on the other strip-shaped material 102.
Ideally, the adhesive 100 should be laminated at a position on the back surface exactly in the middle of the adhesive 100 application position in a, that is, when viewed in a cross-sectional view, the adhesive 100 is applied in a checkerboard pattern with approximately equal intervals. The cylindrical drum of the present invention is used to adhesively laminate strip materials while continuously winding them up to form a laminate for a honeycomb core. For this purpose, the cylindrical roll simultaneously winds up at least two or more strip-shaped materials, and further sandwiches an uncoated strip-shaped material between two strip-shaped materials coated with adhesive on both sides,
Or, it has a structure that is equipped with a heating means for superimposing and winding two or more strip-shaped materials coated with adhesive on one or both sides, and bonding the strip-shaped materials one after another on the circumference. In order for the obtained laminate to be suitable for use as a honeycomb core, it is necessary to have an outer circumference such that the adhesive coating interval and coating width constituting the striped pattern overlap at the same position in the laminate. There is. To this end, when using a strip material coated with adhesive on both sides, the outer circumference must be an integral multiple of the repeating width of the above pattern (for example, the length indicated by W in Figures 2 and 3). In addition, when only a strip-shaped material coated with adhesive on one or both sides is used, it is preferable that the width is an odd number multiple of one-half of the repeat width of the pattern. Furthermore, the outer circumference of this cylindrical drum can be changed (reduced or extended) according to the repeat width of the adhesive application pattern so that many types of honeycomb core laminates can be manufactured from the same drum. Mechanisms such as a method of dividing a cylindrical drum and adjusting the interval between each divided portion, or a method of protruding one or more protrusions on the circumference from the inside of the cylindrical drum and adjusting the height thereof. can be provided. Additionally, this mechanism for adjusting the outer circumference length is also useful for preventing wrinkles from forming due to tightening or heating. As a mechanism for fixing the rotation ratio between the coating roll and the cylindrical roll, there may be a mechanism in which the coating roll and the cylindrical drum are connected by a chain, a gear, a timing belt, etc., and driven by a motor or the like. [Operation] According to the present invention, adhesive is first applied to one or both sides of a plurality of strip-shaped materials using separate application rolls. At this time, the adhesive is intermittently applied to the strip material using, for example, a coating roll, that is, it is applied in a striped pattern perpendicular to the moving direction of the material. The coated strip materials pass through a predetermined route, are laminated and wound together on the same cylindrical drum, and are heat-pressed with adhesive to produce a laminate for a honeycomb core. By the way, the rotation ratio of the cylindrical roll and the coating roll is fixed, and therefore, as the winding diameter increases as the strip material is stacked on the cylindrical drum, the feeding speed of the strip material becomes faster. Since the rotational speed of is constant, the interval between applications of the adhesive on the strip material becomes wider. This increase in adhesive application intervals causes the adhesive in each layer of the material to be arranged radially on the cylindrical drum. The pattern enlarged by this method is
It is preferable to expand the repeating width (W) of the pattern so that it satisfies the following formula. Dn _-2 ／D ₀ W ₁ ＜Wn＜Dn ₊₂ ／D ₀ W ₁ However, D ₀ : Radius of the cylindrical drum Dn : Apparent radius of the cylindrical drum (Thickness when n strips of material are laminated on D ₀ Wn: repetition width in the n-th layer However, when the rotation ratio of the cylindrical drum and coating roll is fixed as described above, the path length of the two strip materials, that is, the distance between both strip materials from the coating position is It has become clear that if the lengths up to the point where they are joined differ, as the number of layers increases, a relative positional shift between the strip materials as shown by the following equation occurs. S ₂ −S ₁ =2kt(l ₂ −l ₁ )/R S ₂ −S ₁ : Relative positional deviation of adhesive between two strip-shaped materials k: Number of laminated layers (two strip-shaped materials are considered as one set. ) l ₂ , l ₁ : Route length of two strip-shaped materials R: Winding radius t: Thickness of strip-shaped materials Based on the investigation of these facts, in the present invention, the route lengths l ₁ and l ₂ are set to be the same. By doing so, there is no relative positional deviation (S ₂ −S ₁ ). In this way, there is no relative positional shift between the adhesives of the two strip materials, so that by stretching this laminate, a honeycomb core of a desired shape can be manufactured. [Example] FIG. 1 shows an apparatus used in a manufacturing method according to an example of the present invention. In the same figure, strip-shaped materials 102, 102a fed out from strip-shaped material coils 101, 101a are coated with coating rolls 104, 1.
At step 04a, adhesives 105, 105a are applied in a striped pattern at predetermined intervals. After that, it is dried in the dryers 106 and 106a, and one of the strip materials 102a is coated with the alignment roll 109 and the guide roll 1.
10 and is guided to a cylindrical roll 112, and the other strip-shaped material 102 is guided to a bypass roll 120 and reaches the cylindrical drum 112. In this case, the length of the route from the adhesive application position to the cylindrical roll 112 is adjusted by the alignment roll 109 and the detour roll 120 so that the length is the same for each strip material 102, 102a. In the cylindrical drum 112, the strip materials 102, 10
While pressing 2a with a pressure row 114, both the strip-shaped materials 102 and 102a are adhered and laminated. In the above apparatus, the cylindrical drum 112 and the application rolls 104, 104a are further connected by a timing belt or the like, and the cylindrical drum 112 and the application roll 104a are
4, the rotation ratio of 104a is set constant. As a result, the winding diameter increases as the strip materials 102, 102a are stacked on the outer periphery of the cylindrical drum 112, the feeding speed of the strip materials 102, 102a increases, and on the other hand, the rotational speed of the application rolls 104, 104a increases. Since it is constant, the strip material 102, 10
The interval between adhesive applications to 2a becomes wider. By doing so, as the winding diameter of the cylindrical drum 112 increases, the interval between adhesive applications becomes wider, and the adhesive in each layer can be arranged radially. Strip-shaped material 102, 1 wound up through the above steps
02a is removed from the cylindrical roll 112, cut into a predetermined length, and then stretched in the stretching direction to form a honeycomb core. Therefore, according to the above embodiment, the rotation ratio of both rolls is fixed by connecting the cylindrical drum 112 and the coating rolls 104, 104a with a timing belt or the like, so that the coating interval can be adjusted as the number of layers increases. Widening control can be achieved with a simple configuration. Moreover, since the channel lengths of the strip materials 102 and 102a are set to be the same, there is no relative positional deviation between the strip materials 102 and 102a, as explained in equation (1) above, so that the desired honeycomb can be obtained. Core is obtained. The following Table 1 shows the laminates for honeycomb cores with various cell sizes of 1/4'', 3/8'' and 3/4'' using a strip material with a thickness of 50 μm and adhesive coated on only one side. This is an example of operation when .

【table】

[Table] *2 Rotation ratio of cylindrical drum and roll coater [Effect of the invention] As explained above, according to the present invention, the length of the path from the coating position to the winding position can be made the same for each strip material, By setting a constant rotation ratio between the application roll and the cylindrical drum, the adhesive can be applied to predetermined positions on the strip material with high precision, resulting in a stable and reliable honeycomb core shape. In addition, since the rotation ratio of the application roll and the cylindrical drum is set constant, that is, the rotation speed of the application roll is controlled to be constant regardless of the increase in the winding diameter.
A complicated rotation speed control mechanism as described in the conventional technique is not required, resulting in a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the manufacturing process according to an embodiment of the present invention, FIGS. 2 and 3 are cross-sectional views of an example of applying adhesive to a strip-shaped material, and FIGS. 4 to 6 show the shape of a honeycomb core. The figure shown in FIG. 7 is an explanatory diagram showing a conventional manufacturing process. 100... Adhesive, 101, 101a... Strip material roll, 102, 102a... Strip material, 1
12...Cylindrical roll, 120...Detour roll.

Claims (1)

[Scope of Claims] 1. Applying adhesive to one or both sides of a plurality of strip-shaped materials using separate application rolls in a striped pattern perpendicular to the moving direction of the materials, and applying adhesive along a predetermined route after application. In the method of manufacturing a laminate for a honeycomb core by laminating a plurality of strip materials together and adhering them while winding them around the same cylindrical drum, the rotation ratio of the application roll and the cylindrical drum is fixed and set, A method for manufacturing a laminate for a honeycomb core, characterized in that the passage lengths of the respective strip materials are set to be the same.