JPH0241408B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a honeycomb structure from a thermoplastic synthetic resin material. More specifically, the present invention relates to an improvement in a method for manufacturing a honeycomb structure having through holes in a direction perpendicular to the plane of a thin plate.

Hitherto, lattice-like structures or honeycomb structures have often been used as working materials. For example, a latticework may include the space between the wall boards of a double wall or the core of a wall, supports for ceiling boards, decorative watermarks,
Uses include partitions, fences, signboards, doors and windows, and filling grates for water towers. In order to manufacture these lattice-like structures using thermoplastic synthetic resin materials, a molded product with a large number of through holes in the length direction is manufactured using an extrusion molding method, and this extrusion molded product is It was often cut out into thin plates at right angles and assembled into a lattice-like structure by combining a plurality of such cut pieces, or by injection molding, cast molding, compression molding, etc.

However, the method of manufacturing products with a large number of through holes by extrusion molding has difficulty in uniformly cooling the molded product, making it difficult to produce a uniform product, and the cutting process requires a lot of man-hours. , and is not suitable for mass production. injection molding, cast molding,
When manufacturing by compression molding or the like, the desired shape can be obtained by designing the product manufacturing mold into a desired lattice shape, but the cost of manufacturing the mold is still very high. Moreover, when using these methods,
Since it was difficult to make the molding process continuous, it had the disadvantage of poor productivity.

As a continuous manufacturing technology that eliminates the above drawbacks, Japanese Patent Application Laid-Open Nos. 58368-1982 and 1989-51-
Methods described in JP-A No. 565, JP-A-53-36564, etc. have been proposed. However, these improved technologies also require the use of molds with special structures, and these molds are difficult to manufacture due to their complex structures, and even if they are manufactured, it is extremely difficult to operate stably. There was a problem.

Under such circumstances, the present inventors have completed the present invention as a result of intensive studies aimed at eliminating various drawbacks of the prior art and providing an industrially advantageous method for manufacturing a honeycomb structure. This is what I came to do.

However, the gist of the present invention is to manufacture a honeycomb structure from a thermoplastic synthetic resin by using an extrusion die with a plurality of longitudinal extrusion slits provided at intervals at the front end of an extruder. The molten resin is then extruded from this extrusion die as a belt-like object, and immediately after these belt-like objects are extruded from the extrusion die, a plurality of adjacent belt-like objects are combined and the side surfaces are spaced apart from each other. A method for manufacturing a honeycomb structure, characterized in that the combination of belt-like objects that are bonded together to form a plurality of bonding points is different from the combination of the adjacent bonding points in the front and back. exists in

The present invention will be explained in detail below.

In the present invention, the thermoplastic synthetic resin refers to what is usually called a thermoplastic synthetic resin. Specifically, low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, general-purpose polystyrene, rubber-reinforced polystyrene, ABS resin, MBS resin, polyethylene Examples include methyl methacrylate, polyacetal, prephenylene oxide, polycarbonate, polyesters, polyamides, polyvinyl chloride, and vinyl chloride-vinyl acetate copolymers. These can be used alone or in combination of two or more.
Note that the above examples do not limit the present invention.

The above thermoplastic synthetic resin may contain conventional resin additives such as plasticizers, lubricants, heat stabilizers,
Antioxidants, light stabilizers, ultraviolet absorbers, dyes, pigments, flame retardants, fillers, etc. can be added.

According to the present invention, the thermoplastic synthetic resin is plasticized and dissolved using an extruder. The extrusion molding machine is a machine known for extrusion molding of thermoplastic synthetic resins, but it can be used without any restrictions.
Available for use.

According to the present invention, an extrusion die having a special extrusion slit but having a simple structure is attached to the tip of the extruder, and the molten resin is extruded as a belt-like product.

The extrusion die has a structure in which a plurality of vertical extrusion slits are provided at intervals on the front surface of a coat hanger type mold. The number of extrusion slits can be selected depending on the size of the extruder (plasticizing capacity), the structure of the honeycomb structure to be manufactured, etc. It is preferable that the upper and lower ends of the plurality of extrusion slits are aligned with each other. The spacing between each extrusion slit is preferably constant, but it is not limited to this; multiple extrusion slits may be made into a set, and each set may be set at a constant interval, or each set may be spaced at arbitrary intervals. . The shape of the extrusion slit is preferably a vertically long rectangle, but is not limited to this, and may be changed to a vertically long rectangle with convex portions on the sides, a vertically long ellipse, or the like.

According to the present invention, the molten resin is extruded as a belt-like material from the extrusion die. Next, before the belt-like product extruded from the extrusion die is cooled, a plurality of adjacent belt-like products are combined and adhered with their side surfaces spaced apart to form a plurality of bonding points. At this time, the combination of belt-like objects forming each adhesive point is different from the combination of adjacent adhesive points.

According to the present invention, a plurality of adjacent belt-like objects extruded from an extrusion die are combined and bonded together to form bonding points. For this reason, immediately after the belt-like material is extruded from the extrusion die, it is bonded to form bonding points before it is cooled.

The bonding point is formed by combining a plurality of adjacent belt-like objects and bonding their side surfaces together. Two or more belt-like objects are combined to form a bonding point. However, if there are too many, the gluing operation will be complicated, so
The upper limit is 4 or 5.

The bonding points are formed by combining multiple belt-like objects, and the combination of belt-like objects is such that when the belt-like objects are viewed in the extrusion direction, adjacent bonding points on the front and back are different combinations of belt-like objects. do. The reason for this is that the belt-like material forms through holes in a direction perpendicular to the extrusion direction.

For example, a large number of belts are extruded from an extruder die, and two belts are combined to bond the sides of each set of belts at the same time. In this case, the bonding points are formed approximately parallel to the front face of the extrusion die. Next, while holding each adhesive point with an adhesive tool (claw),
The adhesive tools are transferred at approximately the same speed as the extrusion speed of the belt-shaped objects, and when these adhesive tools are a certain distance from the front of the extrusion die, the two belt-like objects are combined into a different set from the previous one, and the same procedure as above is carried out. Glue all at once. In this case, the bond points will be approximately parallel to the front surface of the extrusion die and to the previously formed bond points. By forming the bonding points as described above, a honeycomb structure as illustrated in plan views in FIGS. 7 and 8 is obtained.

The bonding points are preferably formed parallel to the front surface of the extrusion die (perpendicular to the length direction of the honeycomb structure), but are not limited thereto. The bonding points are also preferably formed at substantially regular intervals perpendicular to the length of the honeycomb structure, but are not limited thereto.

In order to combine multiple adjacent belt-like objects and adhere the side surfaces to each other, insert multiple pairs of claws of adhesive tools placed above and below the extruded belt-like object between the belt-like objects. Then, each pair of claws clamps multiple belt-like objects. The claws provided on the adhesive tools arranged above and below to hold the belt-like object are parallel to the front surface of the extrusion die and constitute one row of multiple pairs.
A plurality of these columns are provided. In addition, the pairs of claws provided on the upper adhesive tool and the lower adhesive tool are arranged so that they do not collide with each other when multiple belt-like objects are approached from above and below and clamped together. It is better to do so.

After the belt-shaped product extruded from the extrusion die is clamped with the claws of the adhesive, it is taken out while cooling and cut into a certain length. To cool down,
It is best to hold the belt-like material between the tabs and keep the temperature below 50°C. Cooling may be either natural cooling or forced cooling.

Hereinafter, the present invention will be explained in detail based on the drawings, but the present invention is not limited to the following examples unless it exceeds the gist thereof.

1 to 3 show an example of an extrusion die suitable for carrying out the present invention, in which FIG. 1 is a front view, FIG. 2 is a cross-sectional view of FIG. FIG. 4 is a cross-sectional view of FIG. 4 showing a modification of the extrusion slit provided on the front surface of the extrusion die. FIG. 5 is a schematic side view of an example of an apparatus suitable for carrying out the present invention, FIG. 6 is an enlarged side view of an apparatus for gluing belt-like articles, and FIGS. 7 and 8 are views of the present invention. FIG. 3 is a plan view showing an example of a state in which a honeycomb structure is manufactured according to the method.

In the figure, 1, 2, 3, and 4 are extrusion dies, 5 is the front surface of the die, 6 is an extrusion slit, 7 is a connecting portion, 8 is a manifold, 9 is a flow rate control valve, and 10
11, 12, 13 are belt-like objects, 14, 15, 16, 17, 1 are nuts for the flow control valve, respectively.
8, 19, 61 are claws, 20, 21, 6 respectively
2 are respective claw support rods, 22, 23, 63 are each claw fixing plates, 24, 25, 64 are claw opening/closing devices, 26, 27, 65 are each claw opening/closing device fixing plates, 28, 29 are each claw opening/closing device fixing plates. Plate operating cylinders, 30, 31, 32', 33' are guide rods, 32, 33, 34, 35 are plates, 36, 37, 38, 39 are cylinders, 36', 37', 38', 39' are piston rods, 40, 41 are guide rods, 42, 43, 44, 45 are fixed plates, 46 is a refrigerant outlet, 47 is a honeycomb structure, 48 is a honeycomb structure take-up machine, 49 is a guide plate , 50, 51, and 52 indicate bonding points, respectively.

A thermoplastic synthetic resin is melted in an extruder and extruded as a belt-like product through an extrusion slit of an extrusion die attached to the tip of the extruder. The shape of the extrusion slit can be changed in various ways, such as a vertically long rectangle (see FIG. 1) or as shown as a to c in FIG. 4.

The extrusion die 1 is preferably of a coat hanger type, and a manifold 8 spreads the molten resin in the width direction of the die to form a thin structure in each slit. It is preferable to install a flow rate control valve 9 in the molten resin passage, connect it to a bolt, and make it movable up and down with a nut 10.

A plurality of adjacent belt-like products extruded from the extrusion slit are combined and bonded together using an adhesive tool. An important part of the adhesive tool is the claw, and an example of the band equipment for driving the claw is shown in FIG.

In FIG. 5, from the claws 14, 15 to the fixing plate 4
For each of the figure numbers 4 and 45, the even number indicates the upper adhesive tool, and the odd number indicates the lower adhesive tool.

It is best to place the adhesive tools above and below the belt-like object. The upper adhesive tool has a plurality of sets of claws 14 facing downward, and the lower adhesive tool has a plurality of sets of claws 15 facing upward. As shown in FIG. 5, the claws 14 and 15 are preferably arranged alternately at regular intervals so as not to collide with each other.

FIG. 6 shows an outline of the procedure for bonding a plurality of belt-like objects together using claws to form bonding points. The claw 61 is placed in the state shown in FIG. 6a and inserted between the belt-like objects from above or below. Next, the claw opening/closing tool fixing plate 65 is brought close to the claw supporting rod 62 side, the claw opening/closing tool 64 is inserted between the claw supporting rods 62, and the claw 61 is widened (see FIG. 6b).
The claws 61 widen the interval between the belt-like objects and adhere to the belt-like objects spread by adjacent claws to form adhesion points. Once the adhesive points have been formed, the claw opening/closing device fixing plate 65 is moved away from the claw supporting rod, the claw opening/closing device 64 is removed from the claw supporting rod 62, and the claw supporting rod 62 is removed by means not shown in FIG. 6a. All you have to do is get it back to normal.

In order to bring the claw 14 closer to and away from the belt-like object 11, it is preferable to use a device having the following structure, for example. The claw 14 is connected to a claw support rod 20, and the claw support rod 20 is fixed to a fixing plate 22. The back side of the claw fixing plate 22 (the opposite side to where the claws are placed.Hereinafter,
"Back side" is used interchangeably. ) is provided with a pawl opening/closing device fixing plate 26 provided with a pawl opening/closing device 24 in correspondence with the other end of the pawl support rod 20 (the end to which the pawl is not attached). This claw opening/closing device fixing plate 26 is guided by a guide rod 30 and is attached to the cylinder 2.
8 and the piston rod 28'.
It is possible to approach and separate from each other. The opening and closing mechanism of the claw is
This is as explained based on FIG. Further, both the claw fixing plate 22 and the claw opening/closing device fixing plate 26 are arranged on the plate 32, and this plate 32
The plate 32 can be driven by connecting the back side with a piston rod 38' of the cylinder 38 and moving the piston up and down within the cylinder 38. This allows the claw 14 to be attached to the belt-like object 11.
It becomes possible to approach and separate from the target.

The claw 15 installed on the lower side of the belt-like object 11
The approach to and separation from the belt-like object 11 is similar to that of the upper adhesive tool described above.

Since the belt-like material 11 is extruded according to the plasticizing capacity of the extrusion molding machine, the claws for combining and gluing the plurality of belt-like products need to be moved in the extrusion direction in accordance with the extrusion speed. . Claw 14
In order to move the belt according to the speed at which the belt-like material 11 is extruded, it is preferable to adopt the following structure, for example. One end of the plate 34 is connected to a cylinder 36 fixed to a fixed plate 42 by a piston rod 36', and the other end is guided by a guide rod 40 fixed to the fixed plate 44.

In order to move the claw 15 installed on the lower side of the belt-like object in the extrusion direction of the belt-like object 11, it is sufficient to follow the same method as in the case of the above-mentioned upper adhesive tool.

In order to continuously extrude the belt-like material 11 and make it into a honeycomb structure, the steps are as follows: ○ A. Bringing the claw of the adhesive tool closer to the belt-like material, ○ Closing the hook (forming the bonding point), It is necessary to perform each operation of opening and separating the claw from the belt-like object while moving the claw in the belt-like object extrusion direction. Next, it is necessary to return the tabs to the extrusion die side while keeping the tabs separated from the belt-like material.

In order to continuously extrude the belt-like material 11, it is preferable to pinch the belt-like material alternately from top to bottom using claws of adhesive tools placed above and below the belt-like material to form adhesive points. When using an adhesive tool such as the one illustrated in FIG. 5, it is necessary to repeat the above-mentioned operations of the claws from ○I to ○ho alternately up and down.

FIGS. 7 and 8 show an example of a state in which a belt-like product extruded from an extrusion die is held between the tabs of an adhesive tool to form adhesive points.

Figure 7 shows a method in which two adjacent belt-like materials are combined and their sides are regularly adhered at regular intervals to form a row of multiple adhesion points (parallel to the front surface of the extrusion die). The combination of belt-like objects forming each adhesive point was different from the combination of the adjacent adhesive points in front and behind (the row based on claw 16 and the row based on claw 17 are different). Give an example.

FIG. 8 shows the combinations of belt-like objects forming adhesive points, in the case of two (adhesion point 52) (based on claw 18) and in the case of three (adhesion point 51) (based on claw 1).
9) are arranged alternately.

After the belt-like material is held between the claws and the adhesive points are formed, it is preferable to cool both the belt-like material and the adhesive points as quickly as possible. For this purpose, the fifth
As shown in the figure, it is preferable to arrange a cooling medium blowing port 46 between the claws and spray the cooling medium for forced cooling.

Since the honeycomb structure 47 after cooling is not likely to regain its shape, it is preferable to take it off with an endless belt or a take-off machine 48 with a large number of protrusions on the endless belt and cut it into a certain length. .

The honeycomb structure obtained by the method of the present invention can be used for spaces between two wall panels of a double wall, partitions, fences, signboards, doors and windows, etc.
In addition to filling grids for cooling water towers, it can be used for slope protection boards, treads, packaging cushioning materials, etc.

The present invention has the following effects, and its industrial utility value is extremely large.

(1) When using the method of the present invention, there is no need for a complicated mold or a mechanism for causing the filamentous resin to make pendulum motion, which were essential in the conventional method, and it is possible to
The entire device can be simplified by simply adding an extrusion die, a belt-shaped object adhesive, etc., which have a simple structure.

(2) According to the present invention, a large number of honeycomb structures with different structures are manufactured from the same extrusion die by changing the combination of bonding points using the belt-shaped object bonding tool, the density of forming the bonding points, etc. be able to.

[Brief explanation of the drawing]

1 to 3 show an example of an extrusion die suitable for carrying out the present invention, in which FIG. 1 is a front view, FIG. 2 is a cross-sectional view of FIG. FIG. 4 is a cross-sectional view of FIG. 4 showing a modification of the extrusion slit provided on the front surface of the extrusion die. FIG. 5 is a schematic side view of an example of an apparatus suitable for carrying out the present invention, FIG. 6 is an enlarged side view of an apparatus for gluing belt-like articles, and FIGS. 7 and 8 are views of the present invention. FIG. 3 is a plan view showing an example of a state in which a honeycomb structure is manufactured according to the method. In the figure, 1, 2, 3, and 4 are extrusion dies, 5 is the front surface of the die, 6 is an extrusion slit, 7 is a connecting portion, 8 is a manifold, 9 is a flow rate control valve, 10 is a nut for the flow rate control valve, 11, 12 and 13 are belt-like objects, 14, 15, 16, 17, 18,
19, 61 are respective claws, 20, 21, 62 are each claw support rods, 22, 23, 63 are each claw fixing plates, 24, 25, 64 are respective claw opening/closing devices, 26, 27, 65 are respective claw opening/closing devices Fixed plates, 28 and 29 are cylinders for operating the claw opening/closing device fixing plates, 30, 31, 32', and 33' are guide rods, 32, 33, 34, and 35 are plates, respectively, and 36, 37, 38, and 39 are Cylinder, 28', 29', 36', 37', respectively.
38', 39' are piston rods, 40,
41 are guide rods, 42, 43, 44, 4, respectively.
5 is a fixed plate, 46 is a refrigerant outlet, 4
7 is a honeycomb structure, 48 is a honeycomb structure pulling machine, 49 is a guide plate, and 50, 51, and 52 are bonding points, respectively.

Claims (1)

[Claims] 1. When manufacturing a honeycomb structure from thermoplastic synthetic resin, an extrusion die with a plurality of longitudinal extrusion slits provided at intervals on the front side is attached to the tip of the extruder, and the molten resin is extruded from this extrusion die. is extruded as a belt-like product, and immediately after these belt-like products are extruded from an extrusion die, a plurality of adjacent belt-like products are combined and the side surfaces are spaced apart,
A method for manufacturing a honeycomb structure, characterized in that a plurality of bonding points are formed by bonding, and a combination of belt-like objects forming each bonding point is different from a combination of adjacent bonding points.