JPH07308949A - Extrusion molding method - Google Patents

Abstract

PURPOSE:To mass-produce molded objects having various shapes in low cost from a viscoelastic polymeric material. CONSTITUTION:At the time of the extrusion molding of a viscoelastic material, a press mold 8 is brought into contact with an extrusion molded object 2 moving in an extrusion direction while the temp. of the extrusion molded object 2 is held to 40-130 deg.C to continuously provide the recessed part 9 extending in the direction crossing the extrusion direction of the extrusion molded object 2 to the extrusion molded object 2. Pref., the depth of the recessed part 9 is 1/5 or more the thickness of the extrusion molded object 2 and a press mold is constituted so as to continuously provide the groove extending in the extrusion direction of the extrusion molded object 2 and to allow the recessed part to continue to the groove.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for continuously producing an extruded product by extruding a viscoelastic polymer material.
The present invention relates to a method for continuously providing a concavo-convex shape in a direction intersecting the extrusion direction on an extrusion molded body. As a method of using the extruded product obtained according to the present invention, there are a support member for an object, a vibration preventing member, an adhesive member, a sheet for laminating with a vinyl chloride sheet and the like.

[0002]

2. Description of the Related Art Conventionally, the following processing methods are generally known as methods for processing a rubber material to produce a molded product. (1) A thin sheet is manufactured by calendar molding or the like. (2) A string-shaped material, a tubular material, or a sheet-shaped material is obtained by extrusion molding. (3) By press molding, injection molding, etc.
Obtain various shaped workpieces.

[0003]

However, while calendering is suitable for producing thin sheets, it is not suitable for producing thick sheets. In the extrusion molding method, by changing the shape of the die, it is possible to continuously mass-produce a molded body having a constant cross-sectional shape, so the molded body can be manufactured at a much lower cost than other methods. It is possible to mass-produce. However, the cross-sectional shape (transverse cross-section) in the width direction of such an extruded body has the same constant shape as the shape of the die. Therefore, it is not possible to form an uneven pattern in the direction orthogonal to the extrusion direction.

On the other hand, since press molding or injection molding can produce a molded body having almost any shape, there is no limitation on the shape as in extrusion molding. However, in order to manufacture each molded body, a series of processes in which a rubber material is housed inside each mold, this mold is heat-treated, the mold is cooled, and the molded body inside the mold is taken out. Work is required. Moreover, the mold is expensive,
Moreover, each mold is occupied for a long time each time each molded body is manufactured. Therefore, since it is impossible to continuously mass-produce the molded bodies, the manufacturing cost is high, and it is impossible to mass-produce the molded bodies having various shapes at low cost.

An object of the present invention is to make it possible to mass-produce molded products having recesses of various shapes at low cost.

[0006]

SUMMARY OF THE INVENTION The present invention is a method for continuously producing an extruded product by extruding a viscoelastic polymer material, the extruded product having a temperature of 40 ° C to 130 ° C. While holding within the range, by contacting and pressing the pressing mold to the extrusion molded body moving toward the extrusion direction,
The present invention relates to an extrusion molding method, which is characterized in that a recess extending in a direction crossing the extrusion direction of the extrusion molding is continuously provided in the extrusion molding.

[0007]

The present inventor has conducted many experiments on the molding method satisfying the above-mentioned requirements, and as a result, the temperature of the extruded body is kept within the range of 40 ° C to 130 ° C during continuous extrusion molding. However, by contacting and pressing the pressing mold to the extrusion molded body that is moving toward the extrusion direction,
We have succeeded in providing the extrusion with continuous recesses extending in the direction intersecting the extrusion direction of the extrusion. As a result,
An extrusion molded body having a recess extending in a direction intersecting the extrusion direction can be mass-produced at low cost.

[0008]

EXAMPLES The viscoelastic polymer material used in the present invention can be applied to all extrudable viscoelastic polymer materials such as general-purpose rubbers and thermoplastic elastomers. This extruded final product is also a non-vulcanized viscoelastic material (adhesive material such as butyl rubber sealer, a material showing a vulcanized rubber-like viscoelasticity even in a non-vulcanized state such as a thermoplastic elastomer. Etc.), vulcanization of general-purpose rubber and special rubber, products obtained by crosslinking reaction, and rubber foam. These respective materials may be mixed and extruded, or may be extruded in a laminated state. Various additives such as a cross-linking agent, a vulcanizing agent, a foaming agent, an antioxidant, a kneading aid, a filler and a bituminous material can be added to each of these materials.

The temperature of the extruded product when the pressing die is brought into contact with the extruded product must be 40 ° C to 130 ° C.
If the temperature is lower than 40 ° C., even if the pressing die is applied to the molded body, it is not possible to form a concave portion having a shape sufficiently following the pressing die, and undesired deformation occurs in the portion other than the concave portion. Occurs. If the temperature exceeds 130 ° C., the molded body is likely to be deformed excessively this time, so that the shape of the recess is likely to be deformed from the shape of the pressing mold or the other parts are easily deformed.

When the viscoelastic polymer material is a non-vulcanized viscoelastic body, 40 ° C to 80 ° C is particularly suitable. In the case of thermoplastic materials, 80 ° C to 130 ° C is particularly suitable. In the case of the non-foaming vulcanization type, 60 ° C to 110 ° C is particularly suitable. When the viscoelastic polymer material contains a foaming agent, 60 ° C. to 110 ° C. is particularly suitable.
Further, when the viscoelastic polymer material contains a foaming agent, in the foaming step after extrusion molding, the entire extrusion molded body is deformed.
It must be decided after considering the deformation due to this foaming in advance.

If the purpose of forming the recess in the extruded body is decoration, the depth of the recess is merely a design issue. However, this recess has a function as described later,
In order to achieve the effect, when provided, the depth of the recess is
It is preferably ⅕ or more of the thickness of the extruded body.

That is, when the extruded product is used as a support member for the vibration-proof material, it is necessary to provide a compression deformation allowance to this support member. It is preferable that the support member is hard to be rapidly deformed. In this sense, of the thickness of the entire extrusion molded body, the portion provided with the concave portion functions as a compression deformation margin.
Therefore, by setting the depth of the recess to be ⅕ or more of the thickness of the extrusion molded body, it is possible to secure an effective compression deformation margin.

Even when the extruded product is a sheet provided with liquid and gas passages, the depth of the recess is set to be ⅕ or more of the thickness of the extruded product so that the fluid and the gas can be removed. Resistance to passage is reduced, and an effective flow path can be secured. However, in this case, it is necessary to continuously provide a groove extending in the extrusion direction of the extrusion molded body and to configure the pressing die so that the recess is continuous with the groove. As the gas and liquid flow along this groove, and the gas and liquid flow through the recesses that are continuous to this groove, the passage of gas and liquid in the width direction of the extruded body, which could not be realized conventionally, Because it can be realized.

In this case, particularly when the extruded product is used as an adhesive member, air is likely to accumulate between the adhesive surface and the attaching surface of the adhesive member, and the adhesive force is likely to decrease. However, by constructing the pressing die so that the recess is continuous with the groove, the air to be accumulated between the adhesive surface and the sticking surface,
Since it passes through this concave portion, it is possible to increase the adhesive force to the attaching surface of the adhesive material.

When the extruded product is laminated on the vinyl chloride sheet, the contact area between the extruded product and the vinyl chloride sheet can be reduced by providing the recess. As a result, the transfer of the plasticizer to the extruded body, which occurs at the contact portion between the vinyl chloride sheet and the extruded body, is reduced.

It is necessary to prevent the pressure die and the extruded body from sticking to each other. For this purpose, the following method is preferable. (1) A non-adhesive treatment such as a fluororesin treatment is applied to the contact surface between the extrusion molded body and the pressing die.

(2) A water-based coating liquid is applied to the contact surface of the extruded body with the pressing die. However, in this case, if the water-based coating liquid is repelled on the surface of the extrusion molded body, uniform adhesion cannot be prevented. Therefore, it is preferable to make the water-based coating liquid and the extrusion molded body easily wet. In this sense, it is preferable to include the filler or latex in the aqueous coating liquid or use an aqueous suspension. Furthermore, it is preferable that at least the contact surface of the pressing mold with the extruded body is subjected to hydrophilic treatment. To this end, in particular, water-swellable resin in the paint,
Add water-absorbing materials such as bentonite and fine powder silicic acid,
It is preferable to apply this paint to the contact surface.

It is also preferable to prevent the sticking between the viscoelastic polymer material and the pressing die by applying an oily coating liquid on the surface of the extruded body. This oily coating liquid contains grease and the like.

When a coating film is formed on the contact surface of an extruded product using such an aqueous coating liquid or an oily coating liquid, the extruded product has weather resistance, discoloration resistance, stain resistance, etc. In particular, when the extruded product is used as a sheet for laminating with a vinyl chloride resin, migration of the plasticizer from the vinyl chloride sheet can be prevented by the film.

Further, a surfactant or an alcohol-based high boiling point solvent can be used, but in this case, no film remains on the surface of the extruded product. As a method of applying the coating liquid to the surface of the extrusion molded body, use various methods such as a method of dropping the coating liquid on the extrusion molded body, a method of spraying the coating liquid, a method of coating with a doctor blade, etc. You can

The cylinder diameter in the extruder is preferably 5 inches or less. If it exceeds 5 inches, the extruded product will have a very wide sheet or a large cross-sectional area. In the case of such a wide sheet, if concave portions having a depth of ⅕ or more of this thickness are continuously provided, the physical properties, particularly the elongation rate are adversely affected. In addition, the depth of the molded body with a large cross-sectional area is 1
When it is attempted to provide a recess of / 5 or more, it is difficult to provide the recess because other portions are easily deformed.

As a method of contacting and pressing the pressing die with the extruded body, it is preferable to attach the pressing die to a jig and press the jig toward the extruded body. Further, the shape of the jig can be any shape such as a disk shape or a flat plate shape.
Moreover, in order to press the jig toward the extrusion molded body,
It is preferable that the jig is attached to the air cylinder, and the jig is pressed toward the extruded product at regular intervals by operating the air cylinder at regular intervals.

When the jig has a disk shape, the jig is rotated in contact with the extruded body,
It is preferable that the pressing molds of the jig are sequentially and continuously contacted and pressed against the extruded product. In this case, a disk-shaped jig is further driven by the movement of the extrusion molded body in the extrusion direction,
The jig can be rotated, or the jig can be rotated by a driving device such as a motor at a speed synchronized with the movement of the extrusion-molded body in the extrusion direction.

In the extruded product of the present invention, the recess can be formed only on one main surface of the extruded product, or the recess can be formed on both main surfaces of the extruded product. .

Further, after forming the recess in the extruded body, the extruded body is cut in the longitudinal direction of the extruded body to form a thin sheet. Conventionally, even if the extruded body is cut in its length direction (that is, in the extruding direction), the shape of the extruded body in the length direction does not change, so that only a flat sheet is obtained. However, according to the present invention, since the recesses that intersect with each other in the extrusion direction are formed, when a sheet is manufactured by cutting the extrusion-molded body in the length direction thereof,
The recesses appear as irregularities in this sheet. Therefore,
Thin sheets of various shapes can be easily mass-produced by this method.

A more specific embodiment will be described below with reference to the drawings. FIG. 1 is a schematic view showing an extrusion molding apparatus used in the present invention, and FIG. 2 is a partially enlarged view of FIG. The extrusion-molded body 2 is continuously extruded from the extrusion-molding apparatus 1. By supporting the lower surface 2b of the extruded body 2 on the belt 3a of the belt conveyor 3 and rotating the pulley 3b, it is conveyed rightward in FIG.

By passing the extruded body 2 through the heating device 4, the temperature of the extruded body 2 is 40 ° C. to 130 ° C.
The temperature is adjusted to a predetermined temperature within the range of ° C. From the nozzle 5a of the coating liquid supply device 5, a droplet 10 of the coating liquid is dropped on the upper side surface 2a of the extrusion molded body 2. Then, the roller 6 spreads the coating liquid to form a coating film 11 as uniform as possible.

The jig 7 has a disk shape, and the pressing dies 8 are attached to the peripheral surface of the disk 7a of the jig 7 at predetermined intervals. The jig 7 rotates clockwise in synchronism with the moving speed of the extrusion-molded body 2, and as a result, each pressing die 8 sequentially contacts and presses the upper side surface 2a of the extrusion-molded body 2, whereby the concave portion is formed. 9 is formed.

The shape of this pressing die can be variously changed,
For example, the shapes as shown in FIGS. 3A to 3C can be preferably adopted. Pressing die 8 shown in FIG.
In A, the tip portion 12A of the pressing die 8A has an isosceles triangular shape with a sharp tip.

In the pressing die 8B shown in FIG. 3 (b),
The tip portion 12B has a rounded, semi-circular shape. In the pressing die 8C shown in FIG. 3 (c), the tip portion 12C extends at an acute angle like the one shown in FIG. 3 (a), but its tip is rounded. Has been.

FIG. 4 is a perspective view showing an example of the extrusion molded body manufactured by the method of the present invention, and FIG. 5 is a side view of the extrusion molded body 13 of FIG.
[Fig. 6] is a plan view showing another extruded body 17.

In the extruded body 13 shown in FIG. 4, the lower side surface 13b is a flat surface, but the upper side surface 13a has an extruding direction A.
When viewed in a cross section perpendicular to, a pair of protrusions 14A and 14B are formed. Each of the protrusions 14A and 14B has a substantially rectangular cross section, and each protrusion extends in the extrusion direction A. Elongated grooves 15A and 15C are formed outside the protrusions 14A and 14B, respectively, and elongated grooves 15B are also formed between the protrusions. Each groove 15A,
15B and 15C respectively extend toward the extrusion direction A.

Recesses 16 are formed at regular intervals on each of the protrusions 14A and 14B.
Are continuous with the grooves 15A and 15C at both ends and are continuous with the central groove 15B. As a result, each protrusion has a substantially rectangular shape in plan view.

In the extrusion molded body 17 shown in FIG. 6, the lower side surface is a flat surface, but the upper side surface 17a has a pair of protrusions 14A and 14B when viewed in a cross section perpendicular to the extrusion direction A. . Each protrusion has a substantially rectangular cross section, and each protrusion extends in the extrusion direction A. An elongated groove 15 is formed on the outside of each protrusion 14A, 14B.
A and 15C are formed, and an elongated groove 15B is also formed between each protrusion 14A and 14B. Each groove 15
Each of A, 15B and 15C extends in the extrusion direction A.

On the upper surface 17a of the extruded body 17, recesses 18 are formed at regular intervals.
Each have a V-shaped planar shape that is pointed in the extrusion direction A.

In the extrusion-molded body 19 shown in FIG. 7, a concave portion 20A orthogonal to the extrusion direction A is formed on both the upper side surface 19a and the lower side surface 19b of the extrusion-molded body 19.
20B are formed respectively, and these recesses 20 are formed.
A and 20B are provided at substantially the same position as each other when seen in a plan view, and the thickness of the extruded body is extremely small at the portions where the recesses 20A and 20B exist. After manufacturing such an extruded body 19, a thin sheet can be formed by cutting the extruded body 19 in the longitudinal direction A of the extruded body 19. In this sheet, the recesses 20A and 20B remain as the recesses of the sheet.

[0037]

As described above, according to the present invention, when a molded body made of a viscoelastic polymer material is manufactured,
Molded bodies having concave portions of various shapes can be mass-produced at low cost.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of an extrusion molding apparatus used in the present invention.

FIG. 2 is a partially enlarged view showing an enlarged periphery of a jig 7 in FIG.

3 (a), (b) and (c) are front views each showing an example of a pressing die.

FIG. 4 is a perspective view showing an extrusion molded body 13 that can be suitably manufactured by the method of the present invention.

5 is a side view of the extrusion molded body 13 of FIG. 4 as seen from the side surface side (from a direction perpendicular to the extrusion direction).

FIG. 6 is a plan view showing an extrusion molded body 17 that can be suitably manufactured by the method of the present invention.

FIG. 7 is a plan view showing an extrusion molded body 19 that can be suitably manufactured by the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extruder 2 Extrusion molded body 5 Coating liquid supply device 7 Jigs 8, 8A, 8B, 8C Pressing dies 9, 16, 18, 20A, 20B Recesses 10 Droplets 11 Coatings 13, 17, 19 Recesses with recesses formed Molded body 14A, 14B Protrusion 15A, 15B, 15C Groove A Extrusion direction

Claims (5)

[Claims] 1. A method for continuously producing an extruded product by extruding a viscoelastic polymer material, which comprises extruding while maintaining the temperature of the extruded product within a range of 40 ° C. to 130 ° C. Characterized in that a pressing die is brought into contact with and pressed against an extruded body moving in the direction, whereby a recess extending in a direction intersecting the extruding direction of the extruded body is continuously provided in the extruded body. , Extrusion molding method. 2. The extrusion molding method according to claim 1, wherein the depth of the recess is ⅕ or more of the thickness of the extrusion molded body. 3. The pressing die is configured such that a groove extending in the extrusion direction of the extruded body is continuously provided, and the depression die is formed so that the recess is continuous with the groove. The extrusion molding method according to 1 or 2. 4. Adhesion between the viscoelastic polymer material and the pressing die is prevented by applying an aqueous coating solution to the surface of the extruded article before bringing the pressing die into contact with the extruded article. At the same time, a hydrophilic treatment is applied to at least the contact surface of the pressing die with the extrusion-molded body, and the extrusion-molding method according to any one of claims 1 to 3. 5. Adhesion between the viscoelastic polymer material and the pressing die is prevented by applying an oil-based coating liquid to the surface of the extrusion molding before contacting the pressing die with the extrusion molding. The extrusion molding method according to any one of claims 1 to 3, which is characterized in that.