JPH08224772A - Press roll, molding machine for resin sheet using the same, and manufacture of the press roll - Google Patents

Abstract

PURPOSE: To make a very thin resin sheet with efficient heat radiation by providing a cylindrical core member with a central axis, an intermediate layer which covers the periphery of the core member and is made of a soft material, and an outermost layer which covers the periphery of the intermediate layer and is made of a high thermal conductivity material having specified thermal conductivity. CONSTITUTION: A resin sheet S extruded from a T-die 1 which is set in an extruder is pressed in the thickness direction while passing between a press roll 2A and a main cooling roll 2B into a thin film with a specified thickness. In the press roll 2A which is made of a metal and has a smaller diameter than a usual press roll, for example, a steel core member 2A3 is covered with a cylinder of a soft material such as soft rubber, e.g. silicone rubber, to make an intermediate layer 2A2, and the surface of the intermediate layer 2A2 is covered with a cylinder of a material having high thermal conductivity of 0.03cal/cm.sec. deg.C or more, e.g. metal such as corrosion resisting steel and aluminum, to make an outermost layer 2A1. In this way, a very thin sheet can be produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure roll having good cooling characteristics, a resin sheet forming apparatus equipped with the pressure roll, and a method for manufacturing the pressure roll. More specifically, the present invention has a pressure contact roll having an intermediate layer made of a soft material and an outermost layer made of a highly heat-conductive material, which is excellent in heat dissipation capable of pressing a resin sheet by surface contact, and the pressure contact. The present invention relates to a molding apparatus capable of manufacturing an extremely thin resin sheet using a roll as an essential mechanical element, and a simple method for manufacturing the pressure contact roll.

[0002]

2. Description of the Related Art Conventionally, an air knife method, a rubber roll touch method, a three-roll method and the like have been practically used as a typical extrusion molding method for a resin sheet.

Among them, particularly by the three-roll method, it has been difficult to extrude an ultrathin resin sheet having a film thickness of about 0.4 mm or less. It should be noted that further description of the above-mentioned three types of technologies will be omitted. The reason is that these are merely related arts to the present invention, and it is required that they are not patentable in the prior art.

In the apparatus for reducing the thickness of the resin sheet by pressing the resin sheet extruded from the T die by the pressure contact roll and the cooling roll which are opposed to each other, in order to reduce the film thickness of the obtained resin sheet. It is necessary to increase the pressing force of the pressure contact roll against the resin sheet. However, since the pressure contact roll and the cooling roll having a circular cross section are in line contact with the resin sheet, if the pressing force is increased too much, pooling of the molten resin occurs on the upstream side. Therefore, in the conventional device, it was not possible to increase the uniform pressing force in the entire width direction so that an extremely thin resin sheet could be manufactured. Further, there is a problem in that a roll which comes into line contact with a resin sheet in a softened state or a molten state cannot sufficiently rapidly cool the resin sheet, and a resin sheet having desired properties and physical properties cannot be obtained.

As a device capable of solving such a problem, a device using a metal belt schematically shown in FIGS. 2A and 2B has been proposed. The apparatus shown in FIG. 2A includes a pressure roll 21A and a cooling roll 21B that oppose each other with a resin sheet S extruded from the T die 1 interposed therebetween.
A thin endless belt 31 made of corrosion resistant steel (stainless steel) is wound around the pressure contact roll 21A, the support roll 22 and the pressing roll 23. The molten resin sheet S extruded from the T die 1 is surface-contacted between the metal belt 31 between the pressure contact roll 21A and the pressure roll 23 and the main cooling roll 21B, and is pressed and cooled.

The apparatus of FIG. 2B is an apparatus for mounting a metal endless belt 31B on the main cooling roll 21B side in addition to the metal endless belt 31A mounted on the pressure contact roll 21A side. That is, the apparatus of FIG. 2B includes a pressure contact roll 21A and a cooling roll 21B that oppose each other with the resin sheet S extruded from the T die 1 interposed therebetween.
1A and the endless belt 3 wound around the turning roll 22A
1A and the endless belt 31B wound around the cooling roll 21B and the turning roll 22B.

However, there is a problem that the device of FIG. 2A is necessarily a large device, and the device of FIG. 2B is a larger device than the device of FIG. 2A. That is,
In the apparatus of FIG. 2A, the metal endless belt 31 is manufactured so that the thickness thereof is as thin as possible (thickness 0.8 to 1.2 mm), but the curvature is large due to the rigidity of the metal used and the structure thereof. It cannot be bent, and the diameter of the two rolls 21A and 22 must necessarily be increased. As a result, large-diameter rolls 21A and 2 having a diameter of about 800 mm or more
It is necessary to use 2 (21B may be added).

Further, since the apparatus of FIG. 2B has a system using two metal endless belts, it is larger than the conventional apparatus having a single metal endless belt system. It becomes a device.

The endless belt used in such a device is formed by joining both ends of a metal strip with almost no steps, and is highly advanced to form a joint that can withstand a very large number of bends. Since the joining technique is required, its manufacturing cost is high. In addition, the metal endless belt that can be suitably used in such a forming apparatus is currently mainly imported.

Therefore, in the apparatus using such an endless belt made of metal, in addition to the decrease in the degree of freedom of the installation place due to its large size and the increase in installation cost, the manufacturing cost due to the use of the endless belt made of metal increases. Was a problem.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the problems associated with the prior art as described above, and requires a large-sized device including a metal belt, a large-diameter pressure roller and a bearing roller. It is possible to effectively adjust the thickness of the molten resin sheet and to cool it, and to use a compact and inexpensive pressure contact roll, and because this pressure contact roll is used, the installation location can be selected because it is remarkably small. It is an object of the present invention to provide a molding apparatus which has flexibility, low installation cost and manufacturing cost, and is easy to operate.

Another object of the present invention is to provide a method for easily manufacturing such a pressure contact roll.

[0013]

A pressure contact roll according to the present invention comprises a tubular core member having a central axis, an intermediate layer covering the outer periphery of the core member and formed of a soft material, and the intermediate layer. It is characterized by including an outermost layer which covers the outer periphery of the layer and is formed of a highly heat-conductive material having a thermal conductivity of 0.03 cal / cm · sec · ° C or higher.

In the pressure contact roll according to the present invention, the highly heat-conductive material forming the outermost layer may be a metal, for example,
A metal selected from aluminum, aluminum alloys, copper, copper alloys, iron and iron alloys is preferable.

When the outermost layer is a metal,
The ratio of the average thickness to the outer diameter of the pressure contact roll (outermost layer thickness / outer diameter of the pressure contact roll) is 0.1 to 1.5%, preferably 0.1.
It is preferably 25 to 1.2% and the average thickness thereof is 0.6 mm or more.

Further, in the pressure contact roll according to the present invention, the intermediate layer has therein at least one cavity extending over substantially the entire length of the intermediate layer in the generatrix direction, and the pressure transmitting medium is provided in the cavity. The pressure of the pressure roller can be changed by the pressure of the medium injected. When two or more cavities are provided, the pressure transmitting medium to be injected into each cavity is capable of independently setting at least one condition selected from its type, amount and temperature. it can.

In the molding apparatus according to the present invention, a resin sheet in a molten or softened state is run between the main cooling roll and the main cooling roll while applying pressure to reduce the thickness of the resin sheet. A pressure contact roll and a cooling means for cooling the surface of the pressure contact roll with a liquid or a gas medium are provided, and the pressure contact roll has the above structure.

In the molding apparatus according to the present invention, the liquid medium for cooling the surface of the pressure contact roll can be selected from water, an aqueous salt solution and an aqueous water-soluble organic compound solution. Also,
The molding apparatus according to the present invention may include a medium removing unit that removes the liquid medium adhering to the surface of the pressure roll by the cooling unit. The means for removing the cooling liquid medium adhering to the surface of the pressure roll may be composed of at least one selected from a scraping rubber blade, a wiping sponge-like material, and a cold air blowing device.

In the first method for manufacturing a pressure contact roll according to the present invention, a plurality of cuts extending from one end of the cylindrical body substantially in parallel with the generatrix thereof are provided at predetermined intervals in the circumferential direction, and are formed between the cuts. The plurality of tongues are bent in the radial direction to expand the inner diameter of the cylindrical body at one end, and then from the expanded end,
A core member having an outer periphery covered with an intermediate layer formed of a soft material and having an outer diameter larger than the inner diameter of the tubular body is inserted into the tubular body.

A second method for producing a pressure contact roll according to the present invention is one in which the outer periphery of a core member is covered with an intermediate layer made of a soft material, and the intermediate layer has at least one cavity penetrating in the width direction. And inserting the core member into a cylindrical body, and then introducing a fluid into the cavity at a predetermined injection pressure to increase the thickness of the intermediate layer to bring the intermediate layer into close contact with the inner surface of the cylindrical body. To do.

In the second method for manufacturing the pressure contact roll, it is desirable that the thickness of the intermediate layer be reduced by depressurizing the inside of the cavity when the core member is inserted into the cylindrical body.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a pressure contact roll according to the present invention and a molding apparatus equipped with the pressure contact roll will be specifically described with reference to the drawings.

FIG. 1A is a schematic view showing a preferred embodiment of a molding apparatus according to the present invention, and FIG. 1B is a schematic sectional view of a pressure contact roll according to this embodiment. As shown in FIG. 1A, in the molding apparatus of this embodiment, the resin sheet S extruded from the T die 1 mounted on the extruder is cooled by the cooling roll system 2AB and is pressed in the thickness direction to form a predetermined film. It is a thin film having a thickness. The cooling roll system 2AB includes a pressure contact roll 2A and a main cooling roll 2B that are opposed to each other with the resin sheet S extruded from the T die 1 in a molten state or a softened state being sandwiched therebetween. Resin sheet S between these rolls 2A and 2B
As will be described later, while being pressed by the rolls 2A and 2B that are in surface contact with each other, the film is rapidly cooled and the film thickness is reduced to a predetermined film thickness. Below, each roll 2
A and 2B will be explained individually.

As shown in FIG. 1B, the pressure contact roll 2A of this embodiment has a cylindrical core member 2A3 having a central axis, and a cylindrical member which covers the outer periphery of the core member 2A3 and is made of a soft material. The intermediate layer 2A2 and a cylindrical outermost layer 2A1 that covers the outer periphery of the intermediate layer 2A2 (see also FIG. 3).

Specifically, the pressure contact roll 2A is made of a metal having a diameter smaller than that of the pressure contact roll 2A actually used, for example, a steel core member 2A3, and a cylinder made of a soft material such as hard rubber such as silicon rubber. Cover the middle layer 2A2 (layer thickness usually 5
To about 25 mm), and on the surface of the intermediate layer 2A2, a material with good thermal conductivity, such as corrosion resistant steel (eg SUS304),
The outermost layer 2A1 can be provided by covering a cylindrical body made of metal such as aluminum and aluminum alloys so as to be closely adhered. Here, the core member 2A3 is
It may be the rotating shaft itself of the rolling roll, or may be a shape in which a rotating shaft portion having a small diameter is formed at both ends of a columnar body having a large diameter.

The outermost layer 2A1 constitutes the surface of the pressure contact roll 2A that contacts the resin sheet S. This outermost layer 2A1
Is a material having a high thermal conductivity of 0.03 cal / cm · sec · ° C. or higher, preferably 0.035 to 0.6 cal / cm · sec · ° C., and desirably having excellent mechanical strength. Although not particularly limited except that, metal is practically used as a material.

The role of the intermediate layer 2A2 made of a soft material is to elastically deform and support the outermost layer 2A1 located on the surface of the outermost layer 2A1 while flexing it. Due to the bending, the surface of the pressure contact roll 2A comes into surface contact with the molten resin sheet, and further the surface of the molten resin sheet comes into contact with the cooling roll 2B, so that the resin sheet is cut even if the resin sheet is pressed with a large force. Thus, the resin sheet can be efficiently cooled, and the surface state of the resin sheet S obtained can be improved to an extremely good level.

The evidence of surface contact is that when the resin sheet S on the cooling roll 2B is pressed with a predetermined pressure from a direction perpendicular to the resin sheet S with a pressure roller 2A colored with a red dye (pigment), the contact area is "A certain width" on the surface of the pressure contact roll 2A
It can be confirmed by being transferred as the red area. This "width" is referred to as the "pressure contact portion deformation amount".

The intermediate layer 2A2 may be provided with a hollow or empty communication passage therein, as shown by the broken line in FIG. 1B. If such a cavity is provided and a pressure transmitting fluid is injected into the cavity from the outside, the internal pressure of the cavity can be adjusted from the outside. That is, the molding device is provided with a pressure transmitting fluid pressure feeding means (not shown) for the hollow communication passage, and the pressure transmitting fluid is fed from the outside to the hollow communication passage at a desired pressure and the pressure feeding pressure is adjusted. It is possible to increase or decrease the internal pressure of the hollow communication passage. By increasing and decreasing such internal pressure,
In addition to finely adjusting the pressing force of the pressure contact roll, it is also possible to adjust the bending amount of the outermost layer 2A1.

As the pressure-transmitting fluid, a gas is generally preferable to a liquid because a wider adjustment range can be expected, and a non-condensable gas such as pressurized air or pressurized nitrogen is usually preferred. Air is the most prominent in terms of availability, but nitrogen is superior to prevent oxidation of soft materials.

The layer thickness of the outermost layer 2A1 may vary depending on its material. However, when the outermost layer 2A1 is a metal, the ratio of the average thickness to the outer diameter of the pressure contact roll 2A (outermost layer thickness / outer diameter of the pressure contact roll) is 0.1 to 1.5%, preferably 0.1. 25 to 1.2%, and the average thickness is 0.1.
It is preferably 6 mm or more. In particular, this lower thickness limit is only the lower limit of film formation from metals according to current technology. Therefore, the lower limit of the outermost layer 2A1 may be lowered if future technological progress makes it possible to manufacture a thinner outermost layer having a predetermined thermal conductivity and good durability. Add a note.

The outer diameter of the pressure roller 2A is not particularly limited, but is usually 250 to 700 mm, preferably 280 mm.
~ 600 mm. Therefore, the press roll 2A has a large diameter, for example, an outer diameter of 800, which is commonly used when a metal belt is used.
It does not have to be a mm roll. The surface of this outermost layer 2A1 is cooled by the cooling means described later.

Further, the material of the outermost layer 2A1 has a mechanical strength such as bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, rigidity, toughness and specific strength among the metals having excellent corrosion resistance. From the viewpoints of machinability and price, corrosion-resistant steel, aluminum, aluminum alloys, copper, and copper alloys such as phosphor bronze are preferable.

In the pressure contact roll 2A having the above-described structure, when the surface of the resin sheet to be manufactured is required to have smoothness, the roll surface in contact with the resin sheet S extruded from the T die has a mirror finish. Is desirable. The surface with a mirror finish has a surface roughness value of 0.5S or less, preferably 0.2S or less, according to the measurement method specified in JIS B0601, and is referred to as "four rings" in other conventional expressions. It This extremely smooth surface plays a role of creating the smoothness of the resin sheet (S) surface.

The main cooling roll 2B constituting the molding apparatus of this embodiment is made of, for example, cast steel, and when the surface of the resin sheet to be manufactured is required to have smoothness, the roll surface is mirror-finished. Is desirable. The surface with a mirror finish has a surface roughness value of 0.5S or less, preferably 0.2S or less according to the measurement method specified in JIS B0601, and is referred to as "four-sided" in other conventional expressions. To be done. This extremely smooth surface plays a role of creating the smoothness of the surface of the resin sheet S.

As the material forming the main cooling roll 2B, it is desirable to select a material having excellent heat conductivity even by itself. However, since natural heat release using natural heat transfer does not have sufficient heat dissipation capability, it is necessary to make the inside hollow or to provide a flow passage in the same manner as the sectional structure of the pressure contact roll shown in 1B. , In it the cooling medium (refrigerant)
It is usual to make up for the lack of cooling capacity by circulating. As the cooling medium in this case, water at normal temperature or hot water is usually used. When stronger cooling capacity is required, cold water, brine, liquefied gas, or the like can be used as appropriate.

In the forming apparatus of this embodiment, the cooling roll system 2 including the pressure contact roll 2A and the cooling roll 2B described above is used.
In addition to AB, the cooling means 4 for cooling the surface of the pressure contact roll 2A with the cooling liquid medium and the removing means 5 for removing the liquid medium for rejection from the surface of the pressure contact roll 2A after cooling are provided.

The cooling means 4 of this embodiment has a cooling liquid medium (refrigerant) storage tank 41 and a supply device for supplying a coolant of a predetermined temperature to the storage tank 41. The supply device is the storage tank 4
An exhaust passage 43 for circulating the first refrigerant, a temperature controller 44 for adjusting the temperature of the discharged refrigerant such as cooling, and a pump 45 for returning the cooled refrigerant to the storage means 41 are provided.
The lower portion of the pressure contact roll 2A is immersed in the refrigerant stored in the storage tank 41, and the surface of the pressure contact roll 2A is forcibly cooled by the liquid medium.

In this embodiment, the storage tank 41 and the refrigerant supply device constitute a cooling means for forcibly cooling the surface of the pressure contact roll 2A. In the present invention, however, such a cooling means has this construction. The cooling means is not limited to the means 4, and various cooling means can be applied.

The liquid medium removing means 5 attached to the surface of the pressure contact roll 2A cooled by the cooling means 4, that is, the surface of the outermost layer 2A1 is composed of a rubber scraping blade (scraper) 5a and a soft material wiping sponge. It is configured by combining the object 5b and the cold air blowing means 5c (the cold air supply means is not shown). Hereinafter, each will be described more specifically.

(I) The scraping blade 5a is a member having a strip shape and a water drop-shaped cross section in which one of its long sides is thin. The entire length of the blade 5a is substantially equal to the generatrix length of the outermost layer 2A1, and its thin side lightly abuts the surface of the outermost layer 2A1 to scrape off the refrigerant. However, in this embodiment, generally, it is difficult to sufficiently remove the attached cooling liquid medium by scraping off with the blade 5a, and therefore the cool air blowing means 5c described later is also used.

The material of the blade 5a is usually rubber, especially hard rubber. However, the blade 5a may be made of another material having the same properties as hard rubber, for example, a thermoplastic elastomer. Among such thermoplastic elastomers, a thermoplastic elastomer formed of a composition of a crystalline polyolefin and a semi-crosslinked ethylene-propylene elastomer is practical.

(Ii) The material of the wiping sponge material 5b may be a natural sponge (sponge) or a synthetic sponge which is a porous substance made of a soft material such as rubber. The sponge-like material 5b wipes the surface of the outermost layer 2A1 in a wet state while lightly abutting it to remove the attached cooling liquid medium. This wiping sponge 5b is
It has approximately the same length as the bus bar of the outermost layer 2A1 and is brought into contact with the surface of the outermost layer 2A1 evenly. However, in this embodiment, it is difficult to sufficiently remove the attached cooling liquid medium by wiping with the sponge-like material 5b, so that the cold air blowing means 5c described later is used in combination therewith.

(Iii) The cold air blowing means 5c eliminates the wet state by blowing cold air sufficient to scatter / evaporate the refrigerant onto the surface of the outermost layer 2A1, although there is no need to particularly describe it. This means can independently remove the liquid medium adhering to the outermost layer 2A1 if the air volume is sufficiently large, but in this embodiment, the scraping blade 5a is used.
Further, most of the liquid medium adhering to the surface of the outermost layer 2A1 is removed by the wiping sponge material 5b, and then cold air is blown. By doing so, the energy consumption can be reduced as compared with the case of using the cold air blowing means 5c alone.

In the present embodiment, the above-mentioned structure constitutes the means for removing the liquid medium attached to the surface of the pressure contact roll 2A. However, the structure of the removing means is not limited to the means 5 of the present embodiment.
Various removing means can be applied. For example, the liquid medium removing means may be constituted by any one of the scraping blade 5a, the wiping sponge-like material 5b, and the cold air blowing means 5c, and these appropriate two kinds, for example, the scraping blade 5a and Any one of the wiping sponge-like objects 5b may be combined with the cold air blowing means 5c. However, the configuration of this embodiment is preferable in that the liquid medium can be removed most completely and the energy consumption of the cold air blowing means 5c can be reduced.

As described above, the cooling roll system 2 of the molding apparatus of this embodiment
The structures of the AB, the cooling means 4 and the removing means 5 have been mainly described. Below, the pressure contact roll 2A that constitutes the cooling roll system 2AB
The material of is described in more detail.

The highly heat-conductive material forming the outermost layer 2A1 of the pressure contact roll 2A is not limited to metal, but metal is most preferable in practical use. The most practical metal used for the outermost layer 2A1 is corrosion resistant steel, commonly known as "stainless steel". However, examples of metals having higher heat conductivity than corrosion resistant steel include copper; copper alloys such as phosphor bronze and bronze; aluminum; and aluminum alloys such as duralumin.

Therefore, when the corrosion-resistant steel is insufficient in terms of heat transfer property, a metal having a particularly high heat transfer property is selected from the above-mentioned metals to manufacture the outermost layer 2A1, and this is used. It would be good if we could make high pressure heat transfer roll 2A. Further, in some cases, the chemical properties may have to be taken into consideration when selecting the type of metal as described later.

When the purity of the metal has little effect on the corrosion resistance and heat transfer properties, the purity of the metal does not need special consideration in many cases. That is, the outermost layer material is sufficient as long as it has a purity that can satisfy the attributes required for manufacturing the mechanical element, for example, the attributes that each mechanical element should be defined by JIS or the like.

Copper and copper alloys are susceptible to corrosion by ammonia or amines due to the nature of copper. However, it is not easily attacked by ordinary acids, and is only attacked by concentrated nitric acid or sulfuric acid. On the other hand, aluminum and its alloys are not easily attacked by ammonia and amines, but are weak by acids and strong alkalis. On the contrary, depending on the concentrated nitric acid or the concentrated sulfuric acid, high corrosion resistance can be provided.

In the usual resin molding process, concentrated nitric acid,
Although it is almost unlikely to come into contact with concentrated sulfuric acid or concentrated alkali, corrosive compounds such as ammonia, amines and hydrochloric acid, or compounds capable of generating these are stabilizers, additives or catalyst residues contained in the resin. Is it itself,
Alternatively, they can arise from them. Therefore, it is preferable to select the material of the outermost layer 2A1 in consideration of the case where a corrosive compound caused by a stabilizer, an additive, or a catalyst residue contained in the resin comes into contact with the roll surface during molding of the resin.

The material forming the soft intermediate layer 2A2 of the pressure contact roll 2A is a soft material, which is the scraping blade 5
It can also be used as a material. This soft material is
Usually durometer hardness 55-70 degrees, preferably 6
It is preferably 5 to 70 degrees, for example rubber, especially hard rubber or thermoplastic elastomer.

The rubber used for the mid layer 2A2 may be either natural rubber (NR) or synthetic rubber. Examples of the synthetic rubber include cis-1,4-polyisoprene (IR), 1,3-polybutadiene (BR), isoprene-isobutene copolymer rubber (IIR) and butadiene-acrylonitrile copolymer rubber (NBR). These may be used alone or in combination of two or more. These rubbers are usually used in a vulcanized (crosslinked) state.

The thermoplastic elastomer is a material which can be molded by using a molding means of thermoplastic resin and has a certain degree of rubber elasticity. Such a thermoplastic elastomer is, for example, a uniform mixture of a thermoplastic resin and an elastomer, a mixture of a thermoplastic resin and a partially crosslinked (semi-crosslinked) elastomer, and the like. Some crosslinking may occur with the elastomer.

Examples of such a thermoplastic elastomer include a composite of an ethylene resin and a partially crosslinked ethylene-propylene copolymer elastomer, a composite of a propylene resin and a partially crosslinked propylene-1-butene copolymer elastomer, and the like. However, other types of thermoplastic resins and elastomers actually exist. Any of the above rubbers or thermoplastic resins and elastomers is often used as an oil-extended product when used.

As the material resin which can be molded into an ultrathin sheet by the molding apparatus according to the present invention, which has been specifically described above with reference to its preferred embodiments, thermoplastic resins such as polycarbonate, polystyrene, polybutylene terephthalate and polyethylene terephthalate are used. , Cycloolefin copolymers and polymethylmethacrylate. Among them, crystalline resin, particularly crystalline polyolefin (olefin resin) which is a 1-olefin polymer or copolymer is suitable as a material resin for an ultrathin sheet.

Specific examples of such crystalline polyolefin (which plays a role of a matrix resin) include the following resins. Ethylene-based resins, for example, crystalline homopolymer resins of ethylene, other 1-olefins that are ethylene and a comonomer, such as propylene, 1-butene, 4-
Crystalline copolymer resin with one or more selected from methyl-1-pentene and the like; propylene-based resin, for example, crystalline homopolymerization resin of propylene, other propylene and comonomer
1-olefins such as ethylene, 1-butene, 4-methyl-1
-Crystalline copolymer resin with at least one selected from pentene and the like; two or more compositions selected from the above ethylene-based resins or propylene-based resins; and at least one selected from the above-mentioned ethylene-based resins, and the above A composition with at least one selected from propylene-based resins.

The ethylene-based resin and the propylene-based resin may be crystalline resins in which polar monomers other than the above-mentioned comonomers are copolymerized or graft-polymerized in an amount that does not impair their characteristics. Examples of polar monomers to be copolymerized include vinyl compounds such as vinyl acetate. In addition, examples of polar monomers shown in the graph include unsaturated carboxylic acid anhydrides such as maleic anhydride.

In the pressing roll and the molding apparatus using the pressing roll according to the present invention described above, when the outermost layer 2A1 press-contacts the resin extruded sheet S to the main cooling roll 2B, a slight temporary deformation occurs. While the surface pressure is applied to the resin extruded sheet S, it is cooled. Therefore, even if the pressing force applied to the resin sheet S is increased, the resin sheet S is not cut, the cooling area is wide, the resin sheet S can be effectively cooled, and an extremely thin extruded sheet having an extremely good surface condition is obtained. Can be manufactured. The pressure contact roll 2A
The fact that the pressure contact between the resin sheet S and the resin sheet S is surface contact is
It can be confirmed by pressing the resin extruded sheet on the cooling roll from a direction perpendicular to the resin extruded sheet with a press roll colored with a red colorant. That is, the red colorant applied to the pressure roll according to the present invention is transferred in the form of a belt of constant width on the resin sheet after pressing the resin sheet.

The pressure contact roll according to the present invention and the molding apparatus according to the present invention have been described above with reference to a preferred embodiment. Next, the method for manufacturing the pressure roll according to the present invention will be described in detail.

The pressure contact roll according to the present invention comprises the above-mentioned core member, the intermediate layer and the outermost layer, and it is desirable that the intermediate layer adheres to the core member and the outermost layer as uniformly as possible. The following two methods can be mentioned as a method capable of manufacturing such a rolling roll simply and simply. (1) A notch having a predetermined length is provided substantially parallel to the axis from the even-numbered position of one end of the outermost cylinder toward the other end.
The tongue portion left between the cuts is bent outwardly, and the diameter is expanded so that the tip of the tongue draws an envelope circle having a diameter slightly larger than the outer diameter of the cylindrical body. Then, from its expanded end,
A core member covered with a soft intermediate layer is gradually fitted into the cylindrical body, and a pressure roll that covers the surface of the intermediate layer in a state where the outermost layer is in close contact is manufactured. (2) In the soft intermediate layer that covers the outer periphery of the core member, at least one cavity that extends over substantially the entire length of the intermediate layer in the generatrix direction is formed. After inserting the core member covered with the intermediate layer into the cylinder forming the outermost layer, a fluid is introduced into the cavity at a predetermined injection pressure to increase the thickness of the intermediate layer, Adhere to the outermost layer that covers. In this method, when the core member is inserted into the tubular body, the hollow communication passage is depressurized to reduce the thickness of the intermediate layer, thereby more smoothly inserting the core member into the tubular body. You can do it.

Next, the method (1) of the methods for manufacturing the pressure contact roll according to the present invention will be described more specifically with reference to FIGS. 3, 4A and 4B. FIG. 3 is a longitudinal sectional view showing a preferred embodiment of a fitting device suitable for carrying out the method (1) of the present invention, FIG. 4A is a bottom view thereof, and FIG. 4B is a plan view thereof. Note that FIG.
3 is a sectional view taken along line 3-3 of FIG. As shown in the figure, in this fitting device, shafts 51 and 6 are inserted through a plurality of shaft holes formed in a rigid base 40 having a substantially flat plate shape, and both are rotatably supported. Among these, the shaft 51 is a screw shaft (hereinafter also referred to as the screw shaft 51) in which screws are formed over substantially the entire length of the outer circumference, and the shaft 6 is a ratchet shaft.

Further, a recess 41 for accommodating the shaft end of the core member 2A3 covered with the intermediate layer 2A2 is formed in the gantry 40, and a total of seven screw shafts 51 are mounted.
Are arranged at substantially equal intervals on the circumference centered on the recess 41. That is, the semi-finished product in which the intermediate cylinder 2A2 is externally fitted to the core member 2A3 and the cylindrical body (outermost layer 2A1) into which the intermediate cylinder 2A2 is fitted are supported at the centers of the plurality of screw shafts 51 arranged on the circumference. Has been done.

Further, the outermost cylindrical body 2A1 is provided with even-numbered cuts of a predetermined length substantially parallel to the axis from one end to the other end. Then, the tongue piece portion left between the cuts is bent outward.

Since such a cylinder 2A1 is arranged with the screw shaft 51 and the semi-finished product as described above, the outermost layer 2A1 can be evenly fitted. That is, for example, when the outer diameter of the pressure contact roll 2A is 200 to 400 mm, the inner diameter of the cylindrical body 2A1 is only 0.3 to 0.9 mm larger than the outer diameter of the soft material intermediate layer 2A2 to be located inside. After the cylindrical body 2A1 is formed to have a small diameter and the cylindrical body 2A1 is fitted, the cylindrical body, which is the outermost layer, tightens the intermediate layer 2A2 by the above amount.

Therefore, when inserting the core member 2A3 covered by the intermediate layer 2A2 made of a soft material into the cylindrical body 2A1, a large traction force or a propulsive force is applied to the long axis of the cylindrical body 2A1 in order to cope with a large resistance. It is necessary to apply in the direction. Moreover, at the same time, it is required that the traction force or the propulsion force is applied as evenly (uniformly) as possible on the circumference of the cylindrical body 2A1.

In the screw shaft 51 of this embodiment, the screw engraved on the peripheral surface thereof is a male screw engraved in the same direction, and each of these is screwed into a flange 81 provided with a female screw. To be done.

The flange 81 is circular with an overhang, as shown in FIGS. 4A and 4B. This overhanging portion transmits the traction force to the tubular body 2A1 to be fitted. This pulling force is generated as the flange 81 is pulled downward in the figure by the rotation of the screw shaft 51. The transmission of this traction force is performed via the tongue piece 2A1t at the lower end of the cylindrical body 2A1 which is firmly connected to the projecting portion of the flange 81.

As a method for realizing a strong connection between the projecting portion of the flange 81 and the tongue piece 2A1t, for example, adhesion with a super strong adhesive or welding can be mentioned, and welding is particularly preferable. Here, it is desirable that the super-strength adhesive has an adhesive ability that is used for adhering the outer plates to each other in the production of a large airplane, for example.

Further, as shown in FIGS. 4A and 4B, the gantry 40 is formed in a combined shape having a substantially circular main body portion and a substantially rectangular protrusion portion protruding from the main body portion.
The main body portion of the gantry 40 supports seven screw shafts 51 that are rotatably inserted in shaft holes provided at positions substantially along the circumference, and the screw shafts 51 protruding from the lower portion of the gantry 40. A sprocket (sprocket wheel) 51g is attached to the lower end of the. Also,
The projecting portion of the gantry 40 rotatably supports the ratchet shaft 6, and the sprocket 6g is also fitted to the lower end of the ratchet shaft 6.

In the fitting apparatus of this embodiment, all of these sprockets 51g and 6g have these sprockets 5.
A drive chain 7 is mounted so as to engage with 1g and 6g from the outside. Therefore, by rotating the ratchet shaft 6, all the sprockets 51g rotate in synchronization with each other, and all the flanges 81 descend simultaneously. In this method, the screws engraved on all the screw shafts are uniformly provided in the same direction (only right-hand screw or left-hand screw).

It is not necessary to mount the drive chain 7 in the same manner as in this embodiment, but the drive chain 7 is mounted so as to meander between the sprockets 51g fitted to the screw shaft 51 (this method is referred to as "alternating"). It may be referred to as a "mounting method").

In this alternate mounting system, the drive chain 7 can efficiently transmit the driving force as a result of the length of the portion engaged with each sprocket 51g becoming longer. In addition,
In this alternate mounting system, a shaft 51 to which a sprocket 51g with which the drive chain 7 engages from the outside is joined,
The screws engraved with the shaft 51 to which the sprocket 51g engaged from the inside is joined must be mutually reverse screws. Therefore, in the alternate mounting method, the left screw is more expensive, which may be an economical weak point.

Further, as particularly shown in FIGS. 3 and 4B, a ratchet shaft 6 is supported on the projecting portion of the gantry 4, and the ratchet shaft 6 is engaged with the ratchet mechanism 91. The ratchet mechanism 9
1 is provided with a drive lever 9 whose one end is fixed.
Rotational force in a specific direction applied by the drive lever 9 is transmitted to the ratchet shaft 6 by the ratchet mechanism 91, and rotates the ratchet shaft 6 in a specific one direction by a predetermined angle.

On the other hand, in the circular portion, seven screw shafts 51 are arranged on the same circumference, and these screw shafts 51 transmit the rotation of the ratchet shaft 6 in one direction through the drive chain 7. , All rotate in the same direction.

The flange 8 is screwed into the screw shaft 51, and the protruding portion of each flange extends toward the center of the cylindrical body 2A1 to be fitted, and the tongue formed at the lower end of the cylindrical body 2A1. It is fixed to piece 2A1t. On the other hand,
As shown in FIG. 4B, the tongue pieces 2A1t are eight narrow arc-shaped pieces and are adjacent to each other at a narrow interval. The outer surface of each tongue piece 2A1t is arranged on the same circumference.

This circumference is the outer circumference of the cylindrical body 2A1 to be fitted. Inside the cylindrical body 2A1, there is an intermediate layer 2 made of a soft material.
A2 is located. The intermediate layer 2A2 is usually made of rubber. Inside the intermediate layer 2A2, a core member 2A3 made of cast steel or the like is arranged, and the core member is provided with a rotating shaft of the press roll 2A.

The operation of the fitting device having the above structure will be described below. In the fitting device of this aspect, when the drive lever 9 is alternately swung forward and backward in FIG. 3 at a predetermined angle, only the rotational movement in the specific direction is intermittently applied to the ratchet shaft 6 via the ratchet mechanism 91. Transmitted.

The intermittent rotation in the specific direction transmitted to the ratchet shaft 6 is transmitted to the sprocket 6g fitted to the other end of the shaft 6, and the rotation of the sprocket 6g is transmitted through the drive chain 7 engaging with it. It is transmitted to the screw shaft 51 to rotate them.

All the screw shafts 51 are rotated in the direction of pulling down the flanges 8 screwed onto the screw shafts 51 by screws engraved on the outer periphery thereof. The external force to pull down the flange 8 is applied to the cylindrical body 2 through the projecting portion of the flange 8.
Pull A1 downwards. As a result, the tubular body 2A1 advances downward while tightening the soft material intermediate layer 2A2. The fitting operation is completed when the end of the tongue piece 2A1t formed at the lower end of the metal outer cylinder 2A1 is pulled down to a position slightly lower than the lower end of the intermediate layer 2A2 in the figure.

The pressure contact roll 2 fitted after the fitting operation is completed.
The pressure roll 2A can be obtained by removing the crude product of A, cutting and removing all the tongue pieces 2A1t protruding at one end, and finishing the cut end.

[0082]

In the pressure contact roll and the molding apparatus using the pressure contact roll according to the present invention described above, the pressure contact roll is formed of a cylindrical core member having a central axis and an outer periphery of the core member and is made of a soft material. Since the formed intermediate layer and the outermost layer that covers the outer periphery of the intermediate layer and is formed of a highly heat-conductive material are provided, the outermost layer of the pressing roll presses the resin extruded sheet onto the main cooling roll. As a result, a slight temporary deformation occurs, so that the resin extruded sheet is cooled while applying a surface pressure. Therefore, even if the pressing force applied to the resin sheet is increased, the resin sheet is not cut,
A resin sheet can be effectively cooled with a wide cooling area, and an extremely thin extruded sheet having a very good surface condition can be manufactured.

[0083]

EFFECTS OF THE INVENTION According to the press roll of the present invention and the apparatus for forming an ultra-thin extruded sheet equipped with the roll, a thin sheet extruded, which has been considered to be the thinnest in the past, is a system in which a cast sheet is pinched by the rolls. Ultra-thin extruded sheet (0.09mm), which is much thinner than the sheet (film thickness: about 0.4mm)
Degree) can also be created.

Further, according to the present invention, since a metal belt which is hard to bend and a large roll are not required, a compact molding device which occupies a small space, is inexpensive, and is capable of manufacturing an ultrathin extruded sheet is provided. Can be provided.

Further, according to the present invention, the conventional apparatus can be improved only by exchanging the press contact roll for the press contact roll of the present invention, so that there is an advantage that the cost required for it can be relatively small.

Further, in the present invention, since the metal belt is not used, consideration should be given to a defect resulting from this, for example, a breakage accident of the metal belt, an interruption of the operation due to the belt break, and a spare belt for continuous operation. In addition to various advantages such as the preparation of the above, there is no need to spend a large amount of money for purchasing a metal belt.

[0087]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the accompanying drawings and embodiments. However, the present invention is not limited thereto.

[0088]

Example 1 T connected to the outlet of a screw extruder
From the die (1), a melt-extruded sheet (S of propylene-ethylene crystalline copolymer [MFR (230 ° C; 2.16 kgf) 2.6 g / 10 min; crystal melting point 159 ° C; ethylene unit content 2.5 mol%]). ) (Layer thickness of about 0.4 mm; width of 1150 mm) is extruded, and the press roll (2
It was sent between A) and the main cooling roll (2B). At this time, the pressure contact force of the pressure contact roll (2A) against the extruded sheet (S) was 9.0 kgf / cm on the basis of linear pressure. The extruded sheet (S) is pressed against the surface of the main cooling roll (2B) by the pressure contact roll (2A) and is crushed, and at the same time, is rapidly cooled by the surface contact with the metal outer cylinder (2A1) to obtain an extremely thin sheet. (Layer thickness is 0.09 mm).

While the thinning operation is continued, the pressure contact roll (2
A molten resin bank did not occur on the inlet side between A) and the main cooling roll (2B), while the metal outer cylinder (2
A1) is elastically deformed flatly in the press contact part [The length of the surface contact with the extruded sheet as a result of the metal outer cylinder being distorted in the center direction: 1.6 mm on average] Face-to-face contact.

The main cooling roll (2
B) (diameter 500 mm) is entirely made of cast iron and has a cooling water flow passage therein as shown in FIG. 1B. The cooling water (temperature of 12 ° C.) introduced into this flow passage was allowed to flow in and out from the outside through the flow passage on the axis of the rotary shaft.

The pressure contact roll (2A) (diameter 300 mm) has a core member (2A3) made of cast steel, and a soft intermediate layer (2A2).
Was made of rubber (durometer hardness 68 degrees), and the metal outer cylinder (2A1) (layer thickness 1.2 mm) was made of corrosion resistant steel (SUS304).

The pressure contact roll (2A) is cooled by the cooling water (temperature 2) stored in the storage layer (41) of the cooling means (4).
It was immersed in 5 ° C) and cooled, and the operating temperature of the outermost layer (2A1) was kept at 30 ° C. In addition, the operation of the molding apparatus is such that the water adhering to the surface of the pressure contact roll (2A) is sprayed with a rubber scraping blade (5a) and cold air (15 ° C.).
It was operated while being removed and dried by the removal device (5) in which c) was combined.

Various properties of the obtained ultrathin extruded sheet were measured. Table 1 shows the results.

[0094]

Example 2 The same propylene-ethylene crystalline copolymer melt extruded sheet (S) (layer thickness about 0.35 mm; width 1150 mm) as in Example 1 except for the layer thickness was used as a pressure roll (2A) of a molding apparatus. It was fed into the main cooling roll (2B) to produce an ultrathin sheet.

The operating temperature of the pressure contact roll (2A) was set to 2
At 8 ℃, press contact force against extruded sheet (S) is 1 based on linear pressure.
It was set to 2.0 kgf / cm. The extruded sheet (S) is pressed against the surface of the main cooling roll (2B) by the pressure contact roll (2A) and is crushed, and at the same time, it is rapidly cooled by the surface contact with the metal outer cylinder (2A1), so that the appearance and quality are improved. Both were excellent ultrathin extruded sheets (S) (layer thickness 0.10 mm).

During the thinning operation, the pressure contact roll (2A)
A molten resin bank did not occur on the inlet side between the main cooling roll (2B) and the outermost layer (2A1), but on the other hand, the outermost layer (2A1) was elastically deformed flat (1.2 mm on average) in the pressure contact portion and the extruded sheet. Surface contact was made with (S).

The main cooling roll (2B) used in this example and its operating conditions are the same as those used in Example 1. The pressure contact roll (2A) was the same as in Example 1 except that the thickness of the corrosion-resistant steel (SUS304) cylinder used as the outermost layer (2A1) was increased to 1.5 mm.

Various properties of the obtained ultrathin extruded sheet were measured. Table 1 shows the results.

[0099]

Example 3 A propylene-ethylene crystalline copolymer melt extruded sheet (S) (layer thickness about 0.35 mm; width 1150 mm) which is the same as in Example 1 except for the layer thickness is used as a pressure roll (2A) of a molding apparatus. It was fed into the main cooling roll (2B) to produce an ultrathin sheet.

The operating temperature of the pressure contact roll (2A) was cooled to 30 ° C. by cooling water at 30 ° C., and the pressure contact force against the extruded sheet (S) was adjusted to 14.0 kgf / cm based on the linear pressure. The extruded sheet (S) is pressed against the surface of the main cooling roll (2B) by the pressure contact roll (2A) and is crushed, and at the same time, is rapidly cooled by the surface contact with the metal outer cylinder (2A1) to give the appearance and quality. Ultra-thin extruded sheet that is both good (S)
(Layer thickness 0.12 mm).

During the thinning operation, the pressure contact roll (2
No molten resin bank was generated on the inlet side between A) and the main cooling roll (2B). Also, a metal outer cylinder (2A
1) is elastically deformed flat (1.5 mm on average) at the press contact part
Then, the extruded sheet (S) was brought into surface contact.

The main cooling roll (2B) used in this example and its operating conditions are the same as those used in Example 1. The pressure roll (2A) has a diameter of 250m.
except that the thickness of the corrosion-resistant steel (SUS304) cylinder used as the outermost layer (2A1) was reduced to 1.0 mm.
Same as Example 1.

Various properties of the obtained ultrathin extruded sheet were measured. Table 1 shows the results.

[0104]

Example 4 T connected to the discharge port of a screw extruder
From the die (1), use high-density polyethylene [density 0.967
g / cc; MI (190 ° C .; 2.16 kgf) 5.5 g / 10 min] melt extruded sheet (S) (layer thickness about 0.4 mm; width 1150 mm) is extruded, and a pressure roll of a molding apparatus as shown in FIG. 1A. (2
It was sent between A) and the main cooling roll (2B). At this time, the pressure contact force of the pressure contact roll (2A) against the extruded sheet (S) was 5.0 kgf / cm on the basis of linear pressure. The extruded sheet (S) is pressed against the surface of the main cooling roll (2B) by the pressure contact roll (2A) and is crushed, and at the same time, is rapidly cooled by the surface contact with the metal outer cylinder (2A1) to give the appearance and quality. Both were excellent ultrathin extruded sheets (layer thickness 0.13 mm).

During the thinning operation, the pressure contact roll (2
No molten resin bank was generated on the inlet side between A) and the main cooling roll (2B). Further, the outermost layer (2A1) was elastically deformed to a slightly flat shape (average 0.9 mm) at the pressure contact portion and was in surface contact with the extruded sheet.

The main cooling roll (2
B) (500 mm diameter) is entirely made of cast iron and has a cooling water flow passage inside (not shown). The cooling water (temperature of 12 ° C.) introduced into this flow passage was allowed to flow in and out from the outside through the flow passage on the axis of the rotary shaft.

The pressure contact roll (2A) (diameter 300 mm) has a core member (2A3) made of cast steel and a soft intermediate layer (2A2).
Was made of rubber (durometer hardness 69 degrees), and the metal outer cylinder (2A1) (layer thickness 1.2 mm) was made of corrosion resistant steel (SUS304).

The pressure contact roll (2A) is cooled by the cooling water (temperature 3) stored in the storage layer (41) of the cooling means (4).
The outermost layer (2A1) was kept at 39 ° C. during operation by immersing in 8 ° C. and cooling. In addition, the molding apparatus is a pressure contact roll (2
A) while removing and adhering water adhering to the surface with a removing device (5) which is a combination of a rubber scraping blade (5a) and a cool air (15 ° C) blowing device (5c),
I was driven.

Various properties of the obtained ultrathin extruded sheet were measured. Table 1 shows the results.

[0110]

[Example 5] T connected to the discharge port of a screw extruder
From the die (1), a propylene-based crystalline copolymer [MF
R (230 ° C; 2.16kgf) 2.6g / 10min; Crystal melting point 159
℃; ethylene unit content 2.5 mol%] extruded sheet (S) obtained (layer thickness about 0.4 mm; width 1150 mm) is extruded, press roll (2A) of a molding apparatus as shown in FIG. 1A.
And sent it between the main cooling roll (2B). On this occasion,
The pressure contact force of the pressure contact roll (2A) to the extruded sheet (S) was 2.0 kgf / cm on the basis of linear pressure. The extruded sheet (S) is pressed against the surface of the main cooling roll (2B) by the pressure contact roll (2A) and is crushed, and at the same time, is rapidly cooled by the surface contact with the metal outer cylinder (2A1) to obtain an extremely thin sheet. (Layer thickness is 0.09 mm).

The main cooling roll (2B) used in this example and its operating conditions are the same as those used in Example 1. The pressure roll (2A) was the same as that of Example 1 except that the outer diameter was reduced to 200 mm and an aluminum cylinder (thickness 2.0 mm) was used as the outermost layer (2A1).

The molding apparatus was used except that the temperature of the cooling water for cooling the outermost layer (2A1) of the pressure contact roll (2A) was set to 25 ° C and the operating temperature of the outermost layer (2A1) was set to 37 ° C. It was operated as in Example 1.

During the thinning operation, the pressure contact roll (2
No molten resin bank was generated on the inlet side between A) and the main cooling roll (2B). Also, a metal outer cylinder (2A
1) is elastically deformed to a flat shape at the press contact area (average 2.2 mm)
Then, the extruded sheet (S) was brought into surface contact. Various properties of the obtained ultra-thin extruded sheet were measured. Table 1 shows the results.

[0114]

Example 6 T connected to the discharge port of a screw extruder
Extruded sheet (S) obtained from extruded sheet (S) of 4-methyl-1-pentene-based crystalline polymer from die (1)
(Layer thickness of about 0.4 mm; width of 1150 mm) was extruded and fed between the pressure contact roll (2A) and the main cooling roll (2B) of the molding apparatus as shown in FIG. 1A. At this time, the pressure contact force of the pressure contact roll (2A) against the extruded sheet (S) was 3.0 kgf / cm on the basis of linear pressure. The extruded sheet (S) is pressed against the surface of the main cooling roll (2B) by the pressure contact roll (2A) and is crushed, and at the same time, is rapidly cooled by the surface contact with the metal outer cylinder (2A1) to obtain an extremely thin sheet. (Layer thickness 0.1
3 mm).

The main cooling roll (2B) used in this example and its operating conditions are the same as those used in Example 1. The pressure contact roll (2A) is reduced to an outer diameter of 200 mm, and the outermost layer (2A1) is made of phosphor bronze (layer thickness 1.8 mm;
In accordance with JIS H 3731) A cylindrical body was used in Example 1.
Was similar to.

The molding apparatus was used except that the temperature of the cooling water for cooling the outermost layer (2A1) of the pressure contact roll (2A) was set to 30 ° C and the operating temperature of the outermost layer (2A1) was set to 45 ° C. It was operated as in Example 1.

During the thinning operation, the pressure contact roll (2
No molten resin bank was generated on the inlet side between A) and the main cooling roll (2B). Also, a metal outer cylinder (2A
1) is elastically deformed to a flat shape at the press contact part (average of 2.5 mm)
Then, the extruded sheet (S) was brought into surface contact. Various properties of the obtained ultra-thin extruded sheet were measured. Table 1 shows the results.

[0118]

Comparative Example 1 Melt extruded sheet (S) made of the same propylene-based crystalline copolymer as in Example 5 (layer thickness: 0.35 mm)
Was supplied to the molding apparatus shown in FIG. 2A to obtain an ultrathin sheet. In this forming apparatus, the melt-extruded sheet (S) is made of corrosion-resistant steel mounted between a large diameter (1000 mm diameter) pressure roll (21A) (operating temperature 45 ° C.) and a bearing roll (22). Belt (31) (layer thickness 1.0 mm; operating temperature 4)
(5C) and the main cooling roll (21B). At this time, the corrosion-resistant steel belt (31) was brought into contact with the extruded sheet (S) with a pressure contact force of 15.0 kgf / cm on the basis of linear pressure.

As a result, an extruded sheet (S) (film thickness: 0.2 mm) was obtained in which a portion of the corrosion-resistant steel belt (31) in contact with the connecting portion had a slight residual strain. The belt (31) made of corrosion-resistant steel and the main cooling roll (21
No molten resin bank was generated on the inlet side between B). However, the extruded sheet (S) has a belt (31)
Residual strain was observed in the portion contacting the connection part of No. 3, and it could not be said that it had good properties. Various properties of the obtained extruded sheet (S) were measured. The results are also shown in Table 1.

[0120]

Comparative Example 2 An extruded sheet (S) (layer thickness: 0.30 mm) prepared by extruding the same propylene-based crystalline copolymer as in Example 5 from a T-die (1) was pressed onto a pressure roll (2A). An ordinary steel mirror surface roll (temperature 70 ° C) plated with chrome is used as the extruded sheet (S).
An ultra-thin sheet was prepared using the same molding apparatus and conditions as in Example 5, except that the sheet was pressure-contacted with 20.0 kgf / cm of linear pressure. As a result, residual strain was observed on the entire surface of the obtained extruded sheet (film thickness: 0.30 mm), and defective molecular orientation (non-uniformity) was observed.

Further, while the thinning operation was continued, a molten resin bank was generated on the inlet side between the mirror surface roll and the main cooling roll (2B), and the mirror surface roll made a line contact with the extruded sheet (S). It is obvious that the deformation amount of the pressure contact portion is 0 mm. Various properties of the obtained extruded sheet (S) were measured. The results are also shown in Table 1.

[0122]

[Comparative Example 3] An extruded sheet (S) (layer thickness: 0.35 mm) prepared by extruding the same propylene-based crystalline copolymer as in Example 5 from a T-die (1) was pressed onto a pressure roll (2A). An ordinary steel mirror surface roll (temperature 70 ° C) plated with chrome is used as the extruded sheet (S).
An ultra-thin sheet was prepared by using the same molding apparatus and the same conditions as in Example 5, except that the sheet was pressed with a pressure of 25.0 kgf / cm on the basis of linear pressure. As a result, residual strain was observed on the entire surface of the obtained extruded sheet (film thickness: 0.35 mm), and defective molecular orientation (non-uniformity) was observed.

Further, a molten resin bank was generated on the inlet side between the mirror surface roll and the main cooling roll (2B) while the thinning operation was continued. The fact that the mirror-finished roll only makes line contact with the extruded sheet (S) means that the deformation amount of the pressure contact portion is 0.
Since it is mm, it is clear. Various properties of the obtained extruded sheet (S) were measured. The results are also shown in Table 1.

[0124]

[Table 1]

[Brief description of drawings]

FIG. 1A is a schematic view of a preferred embodiment of a molding apparatus equipped with a pressure roll according to the present invention. FIG. 1B is a sectional view showing a preferred embodiment of the pressure contact roll according to the present invention.

FIG. 2A and FIG. 2B are schematic views showing an ultrathin extruded sheet manufacturing apparatus according to a conventional technique.

FIG. 3 is a vertical cross-sectional view showing a preferred embodiment of a pressure roll manufacturing apparatus.

4A is a bottom view of the device shown in FIG. 3, and FIG. 4B is a plan view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 T die 2AB Cooling roll system 2A Pressing roll 2B Main cooling roll 2A1 Outermost layer 2A2 Intermediate layer 2A3 Core member 4 Cooling means 5 Cooling medium removing means 5a Scraping blade 5b Wiping sponge material 5c Cold air blowing means 6 Ratchet shaft 6g Sprocket 7 Drive Chain 40 Frame 41 Refrigerant Storage Tank 43 Discharge Path 44 Temperature Controller 45 Pump 51 Screw Shaft 51g Sprocket 81 Flange S Molten Resin Sheet

Claims (20)

[Claims] 1. A tubular core member having a central axis, and an intermediate layer covering the outer periphery of the core member and formed of a soft material,
It covers the outer periphery of the intermediate layer and has a thermal conductivity of 0.03 cal / cm.
A pressure welding roll characterized by comprising an outermost layer formed of a material having a high heat conductivity of sec. 2. The pressure contact roll according to claim 1, wherein the highly heat-conductive material forming the outermost layer is a metal. 3. The pressure welding roll according to claim 1, wherein the highly heat-conductive material forming the outermost layer is a metal selected from aluminum, aluminum alloys, copper, copper alloys, iron and iron alloys. 4. The outermost layer is formed of a metal, and the ratio of the average thickness to the outer diameter of the pressure contact roll (outermost layer thickness / outer diameter of the pressure contact roll) is 0.1 to 1.5%, and The average thickness is 0.6 mm or more.
The pressure contact roll according to item. 5. The outermost layer is formed of a metal, and the ratio of the average thickness of the outermost layer to the outer diameter of the pressure contact roll (outermost layer thickness / outer diameter of the pressure contact roll) is 0.25 to 1.2%, And the pressure contact roll according to any one of claims 1 to 4 whose average thickness is 0.6 mm or more. 6. The intermediate layer has therein at least one cavity extending over substantially the entire length in the generatrix direction of the intermediate layer, and a pressure transmitting medium is injected into the cavity, and the medium is injected into the medium. The pressure contact roll according to claim 1, wherein the pressing force of the pressure contact roll can be changed by the injection pressure. 7. The intermediate layer comprises two or more cavities, and the pressure-transmitting medium injected into each cavity independently sets at least one condition selected from the type, amount and temperature. The pressure welding roll according to claim 6, which is obtained. 8. A main cooling roll and a pressure contact roll, which are opposed to each other with a resin sheet in a molten state or a softened state traveling in one direction sandwiched therebetween, to reduce the thickness thereof, and a surface of the pressure contact roll. A cylindrical core member comprising a cooling means for cooling with a liquid or a gas medium, the pressure contact roll having a central axis, an intermediate layer covering the outer periphery of the core member and formed of a soft material, and the intermediate layer. An apparatus for molding a resin sheet, comprising: an outermost layer that covers the outer circumference of the layer and is made of a highly heat-conductive material having a thermal conductivity of 0.03 cal / cm · sec · ° C or higher. 9. The molding apparatus according to claim 8, wherein the highly heat-conductive material forming the outermost layer of the pressure roll is a metal. 10. The high heat conductive material forming the outermost layer of the pressure roll is a metal selected from aluminum, aluminum alloys, copper, copper alloys, iron and iron alloys.
Or the molding apparatus according to item 9. 11. The outermost layer of the pressure roll is made of metal, and the ratio of the average thickness to the outer diameter of the pressure roll (outermost layer thickness / outer diameter of the pressure roll) is 0.1 to 1.5%. The molding apparatus according to any one of claims 8 to 10, wherein the molding apparatus has an average thickness of 0.6 mm or more. 12. The outermost layer of the pressure roll is formed of a metal, and the ratio of the average thickness to the outer diameter of the pressure roll (outermost layer thickness / outer diameter of the pressure roll) is 0.25 to 1.2%.
The molding apparatus according to any one of claims 8 to 11, having an average thickness of 0.6 mm or more. 13. The intermediate layer of the pressure roll includes at least one cavity therein, which extends over substantially the entire length in the generatrix direction of the intermediate layer, and a medium for pressure transmission is injected into the cavity, and the medium is injected. The molding apparatus according to any one of claims 8 to 12, wherein the pressing force of the pressure contact roll can be changed by the injection pressure of. 14. The intermediate layer of the pressure contact roll comprises two or more cavities, and the pressure transmitting medium injected into each cavity meets at least one condition selected from the type, amount and temperature. The molding apparatus according to claim 13, which can be set independently. 15. The molding apparatus according to claim 8, wherein the liquid medium for cooling the surface of the pressure roll is selected from water, an aqueous salt solution and an aqueous solution of a water-soluble organic compound. 16. The molding apparatus according to claim 8, further comprising a medium removing unit that removes the liquid medium attached to the surface of the pressure roll by the cooling unit. 17. The means for removing the cooling liquid medium adhering to the surface of the pressure contact roll is composed of at least one member selected from a scraping rubber blade, a wiping sponge-like material, and a cold air blowing device. The molding apparatus according to any one of claims. 18. A plurality of cuts extending from one end of the cylindrical body substantially parallel to its generatrix are provided at predetermined intervals in the circumferential direction, and a plurality of tongue pieces formed between the cuts are bent in a radial direction. The inner diameter of the cylinder is expanded at any end, and then the expanded end is covered by the cylinder with an intermediate layer formed of a soft material, and the outer diameter is larger than the inner diameter of the cylinder. A method for manufacturing a pressure contact roll, comprising inserting a core member having a diameter. 19. The core member is covered with an intermediate layer formed of a soft material, the intermediate layer having at least one cavity penetrating in the width direction, and the core member is inserted into a cylindrical body, and A method for producing a pressure contact roll, comprising introducing a fluid into the cavity at a predetermined injection pressure to increase the thickness of the intermediate layer and bringing the intermediate layer into close contact with the inner surface of the cylinder. 20. The method according to claim 19, wherein the thickness of the intermediate layer is reduced by reducing the pressure inside the cavity when the core member is inserted into the cylindrical body.