JPH0240503B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a laminated material made by laminating multiple layers of plastic sheets each having a large number of convex projections on one side forming independent air chambers, which are used as packaging/cushioning materials or heat/insulation materials. The present invention relates to a manufacturing method and apparatus.

The above-mentioned plastic sheets (hereinafter simply referred to as protruding sheets) are generally used as packaging and cushioning materials to prevent damage to confectionery, fruits, glass products, precision instruments, etc. during packaging and transportation, and are also used as core materials for health futons. However, since many air chambers are formed on a surface, it has excellent heat insulation and heat retention properties.In particular, if multiple layers of these protruding sheets are laminated together, a kind of honeycomb structure can be formed. Since it exhibits appropriate rigidity or stiffness, it has recently been considered to be used as a heat insulating material in place of glass wool or foamed resin. In addition, this protrusion sheet is inexpensive to manufacture and has excellent moisture resistance, so a laminate made of multiple layers of this protrusion sheet can be said to be more advantageous than conventional heat insulating and heat retaining materials.

When laminating multiple layers of protrusion sheets, if the outermost protrusion sheet is placed with the protrusions facing outward, the air between each protrusion will not act as a heat insulator, but the outermost protrusion sheet If they are arranged with the protrusions facing inward, the air between the protrusions also acts as a heat insulator in the same way as the air within each protrusion, so the latter is better as a heat insulator.

However, as a method for laminating multiple layers of such protrusion sheets, conventional methods of heat fusion or bonding with adhesive have been experimentally conducted, but methods using heat fusion have been used to form protrusion sheets. The raw material film is made of ethylene polymers such as polyethylene and polypropylene, or condensation polymers such as nylon and polyester, and is extremely thin at 20 to 250 μm, so it is sensitive to heat and is especially sensitive to air during heat fusion. This is not a preferred method because the protrusions forming the chambers are easily broken. Conventionally, as shown in FIG. 1, a quick-drying hot-melt adhesive 2 is melted in a melting tank 4 equipped with a heater 3, and adhesive is applied to the outer circumferential surface to match the protrusions of the protrusion sheet 1. A coating roller 5 provided with a plurality of grooves is immersed in the melted adhesive 2,
The roller 5 is brought into contact with one of the protruding sheets 1a while scraping off the adhesive adhering to the surface of the roller 5 with a doctor knife 6, and the adhesive 2 remaining in the groove is applied, and then the pressure roller 19a is used to apply the adhesive 2 remaining in the groove. A method is adopted in which two protrusion sheets 1 and 1a are pasted together. However, in this method, when laminating three or more layers of projection sheets 1, it is necessary to prepare a large number of tanks 4 and rollers 5.
In particular, since the tank 4 is heated by the heater 3, its arrangement should not affect the protrusion sheet 1.
In addition, a certain amount of space must be provided vertically or horizontally so that the tanks 4 do not hit each other.Furthermore, since the tanks 4 are provided, the distance between the roller 5 and the pressure roller 19a is also quite long, which requires a large amount of space. Since the adhesive 2 is not only applied to the protrusion sheet 1a by contact with the heated roller 5, there are various drawbacks such as the protrusions of the protrusion sheet 1 may be crushed or broken. .

The present invention solves these conventional problems and enables a large number of protrusion sheets 1 etc. to be laminated together at once in a space-saving manner.

FIG. 2 shows an overall view of an embodiment of the device of the present invention, in which 7 is a plurality of rolls wrapped with protrusion sheets 1, which are placed on a mounting table 8 having an inclined portion at predetermined intervals in the vertical and front-back directions. The figure shows an example in which five layers of protrusion sheets 1 are laminated together. 9
15 is a guide roller arranged vertically in front of the mounting table 8, and 15 is a guide roller for appropriately adjusting the interval in the thickness direction of the protruding sheet 1 that is continuously unwound in parallel from each roll 7. 8. Guide rollers 9 and 15 form a protrusion sheet feeding device. 10 is an adhesive application device, 19
This is a pressure bonding device having a pressure bonding roller 19a that laminates the projection sheets 1 coated with adhesive at one time.

In the adhesive applicator 10, as shown in FIG. 3, an adhesive discharge pipe 12 having a plurality of nozzles 11 is vertically arranged at appropriate intervals at right angles to the flow direction of the projection sheet 1. In the case of five-layer lamination, the discharge pipes 12 are arranged horizontally in four stages, and the nozzles 11 are arranged in a third row according to the arrangement of the projections on the projection sheet 1.
It is attached to the discharge pipe 12 downwardly or upwardly as shown in the figure. In addition, in Figure 3, the adhesive is applied to nozzle 1.
1, each discharge pipe 12 is formed into an inner and outer double pipe, as shown in FIG. The tube 12a is configured so that it can be slid tightly around the inner surface of the outer tube 12b to which the nozzle 11 is attached by a prime mover such as an air rotary actuator 13, or can be rotated by a certain angle, and is rotated at the corresponding position of each nozzle 11 of the inner tube 12a. A small hole 14 is opened in the hole 14 that can communicate with the nozzle hole, so that the actuator 13 is stopped and the adhesive press-fitted into the inner tube 12a is continuously passed from the nozzle 11 through the small hole 14. The adhesive can be applied in a straight line by discharging it toward the projection sheet 1, or it can be applied in a dotted or chain line by discharging the adhesive intermittently by continuously or intermittently rotating the inner tube 12a using the actuator 13. I'm starting to be able to do that.

For example, five protrusion sheets 1 that are continuously fed from the rear are adjusted in vertical distance by a group of guide rollers 15 provided in the adhesive applicator 10, and the nozzles of each adhesive discharge pipe 12 are adjusted. 11 (for example, with a gap of 5 mm or less from the tip of the nozzle). Reference numeral 16 denotes an adhesive storage tank containing a fluid adhesive, and when using a hot melt adhesive, it is equipped with a heater to heat and melt it. The adhesive in the storage tank 16 is press-fitted into each discharge pipe 12 by a gear pump 17, and is discharged from the nozzle 11 toward each protrusion sheet 1.

Note that the discharge pipes 12 are not limited to fixed types, and may be reciprocated from side to side to apply the adhesive in a wavy manner to one surface of the protrusion sheet.Also, the discharge pipes 12 may be arranged in two rows, front and rear, and either one or By reciprocating both of them, the adhesive is applied so as to cross each other in a cross-sectional manner, so that the laminated material 18 obtained by laminating multiple layers of protrusion sheets 1 is strong in any direction. You can also. Furthermore, the adhesive may be applied to either the surface of the protrusion sheet 1 having or not having protrusions.

Each protrusion sheet 1, on which the adhesive is simultaneously applied in dots or lines on one of the surfaces to be joined as described above, is pinched and crimped at a time by a pressure roller 19a disposed in front, for example, the protrusion sheet 1 is A laminated material 18 in which five layers of the sheet 1 are laminated is continuously obtained, and the laminated material 18 further advances along the line and is cut into an appropriate length or wound onto a large roll (not shown). be.

According to the above method, there is no need to arrange the tank 4 with heater 3 and the adhesive application roller 5 according to the number of stacked protrusion sheets 1 as in the conventional case, and the adhesive discharge pipe 12 having a large number of nozzles 11 Since it is only necessary to arrange multiple stages of adhesives and forcefully feed the adhesive from one adhesive storage tank 16 to each discharge pipe 12, the space of the entire device can be reduced, and the protruding sheet 1
Since the adhesive is applied without contacting the nozzle 11, there is no risk that the protrusions of the protrusion sheet 1 will be crushed or broken when applying the adhesive, unlike in the conventional case.

FIG. 5 shows various examples of the laminated material 18 manufactured by the manufacturing method and apparatus of the present invention.
It goes without saying that the number of layers is not particularly limited as long as the number of layers is more than one layer. Figure 5A shows a protrusion 1a forming an independent air chamber of the protrusion sheet 1.
It is made by laminating surfaces with a large number of faces all facing in the same direction. B and C show examples in which at least the surface with the protrusions 1a of the outermost layer of the protrusion sheet 1 faces inward, and both the front and back sides are formed smooth; C is bonded to the surface having the protrusions 1a of the protrusion sheet 1, and C is made by using a film 1' in which one film is further attached in advance to the surface having the protrusions of the protrusion sheet 1 as the center material, Another protrusion sheet 1 is bonded with all its surfaces having protrusions 1a facing toward the center member 1', so that both the front and back surfaces of the laminated material 18 are made smooth. Therefore, since the protrusion 1a of one of the outermost protrusion sheets 1 faces outward, it is suitable mainly as a cushioning material, and B and C have the protrusions 1a of both of the outermost protrusion sheets 1. are all facing inward, and the air between each protrusion 1a is also
It acts as an insulator, just like the air inside it, so it is mainly suitable as an insulator.

These laminated materials have considerable rigidity and stiffness as described above, and also have good heat insulation, heat retention, moisture proofing, and soundproofing properties. It is also ideal as a building material in place of glass wool and foamed resin. In addition, when manufacturing this laminated material, if one or several layers in the center are shifted laterally to form unevenness on the side surface of the laminated material, for example, these can be sequentially fitted and connected to form a continuous wall. You can also do it.

Furthermore, if the apparatus of the present invention is used, the protrusions 1a of the protrusion sheet 1 can be formed on the center layer or both outer layers of the laminated material.
It is also possible to easily manufacture sheets with different sizes and shapes, or sheets with a sandwich structure using sheet materials other than the protrusion sheet (for example, glass wool, foamed resin, asbestos, cloth, etc.).

In addition, in the method and apparatus for manufacturing a laminated material in the above embodiment, it was described that the plastic sheets, which are protrusion sheets, are laminated in multiple layers by dot adhesion or linear adhesion. The present invention is not limited to the above-mentioned embodiments, and may be used for laminating multiple layers of other plastic sheets such as highly foamed low-density polyethylene sheets and flexible urethane foam sheets.

As described above, the present invention continuously laminates a plurality of plastic sheets having protrusions at once, so the laminate can be rapidly manufactured.
Moreover, since adhesive is applied to each sheet without contact by arranging adhesive discharge pipes with multiple nozzles in multiple stages, it is possible to apply adhesive to each sheet in a non-contact manner. Since there is no need to arrange an application roller, the entire device requires less space, and there is no damage to the plastic sheet itself or its protrusions when applying adhesive. material can be obtained.

In addition, in the present invention, the plastic sheets are bonded together in dots or lines to obtain a laminated material, so a relatively small amount of adhesive is required, and the laminated material does not become hard due to adhesion. It is possible to easily obtain a multi-layer laminate with excellent flexibility, and since point or line bonding is performed, the adhesive applied to the plastic sheet dries quickly and hardens, so that the laminate can be easily cut. Since the adhesive does not adhere to the knife, it has the advantage that cutting can be performed reliably and easily, and the distance between the adhesive discharge pipe and the pressure roller as well as the distance between the pressure roller and the cutting knife can be made considerably closer. Therefore, the installation space for these can be small.

Further, according to the present invention, a laminated material can be easily manufactured regardless of the number of layers, and a laminated material that can be used for various purposes can be reliably and easily obtained. has advantages.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a conventional method of laminating protrusion sheets, Fig. 2 is an overall explanatory diagram showing an embodiment of the apparatus used in the method of the present invention, and Fig. 3 is an illustration of the adhesive application part of the apparatus of the present invention. FIG. 4 is a partially cutaway front view, FIG. 4 is a longitudinal sectional side view thereof, and FIGS. 5A to 5C are sectional views showing various examples of laminated materials obtained by the method of the present invention. Description of symbols, 1... Protrusion sheet, 2... Adhesive,
3... Heater, 4... Tank, 5... Adhesive application roller, 6... Doctor knife, 7... Roll, 8... Stand, 9... Guide roller, 10
...Adhesive applicator, 11... Nozzle, 12...
Adhesive discharge pipe, 13... Air rotary actuator, 14... Pore, 15... Guide roller, 16... Adhesive storage tank, 17... Gear pump,
18... Laminated material, 19... Crimping device, 19a...
Crimping roller.

Claims (1)

[Scope of Claims] 1. A plurality of plastic sheets each having a large number of convex protrusions forming independent air chambers on one side, each of which is continuously fed at a predetermined interval in the thickness direction. Adhesive is applied in dots or lines on the bonding surface of the sheet by passing through the adhesive discharge tube in close proximity to multiple nozzles of adhesive discharge tubes arranged in multiple stages, and then A method for manufacturing a laminated material, characterized by bonding multiple sheets at once. 2. A laminate manufacturing device comprising a plastic sheet supply device having a large number of convex protrusions forming independent air chambers on one side, an adhesive coating device, and a pressure bonding device, wherein the plastic sheet supply device A stand for hanging multiple rolls of
The adhesive applicator is equipped with a guide roller that adjusts the interval in the thickness direction of the sheets that are continuously unwound in parallel from each roll, and the adhesive applicator has a plurality of rollers that apply adhesive to the bonding surfaces of the plastic sheets. A plurality of noisy adhesive discharge pipes are arranged at predetermined intervals from each other in the thickness direction of these sheets, and the adhesive in the storage tank can be force-fed to each of the discharge pipes via a pump, and the adhesive is crimped. An apparatus for producing a laminated material, characterized in that the apparatus is equipped with a pressure roller for simultaneously pressure-bonding a plurality of plastic sheets whose joint surfaces are coated with an adhesive. 3. Each of the adhesive discharge tubes is formed into a double inner and outer tube, and an inner tube into which the adhesive is press-fitted is rotatably provided in the outer tube having a plurality of nozzles, and a portion of the inner tube corresponding to each nozzle is provided with a rotatable inner tube. 3. The apparatus for manufacturing a laminate material according to claim 2, wherein the pores are formed to have pores that can communicate with the nozzle holes.