JP2008075140A - Guide member for use in transporting step of article and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a guide member which has low friction resistance by decreasing a contact area with an article thereby making smooth transportation of the article possible, and which has improved antifouling property and cleaning property while keeping the low friction characteristic and wear resistance of a chrome plated surface. <P>SOLUTION: The guide member is formed by electroplating the surface of a metallic base material with a chromium compound and has a chrome plated layer 2 having a pear-skin finished surface and 0.3-5 μm mathematical average roughness Ra by JIS-B0601:2001 regulation of surface roughness and the surface of the chrome plated layer 2 is coated with a straight silicone resin 3 having polysiloxane bond (Si-O-Si). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a guide member used in an article transfer process and a manufacturing method thereof. More specifically, for example, in a yarn manufacturing process under a high temperature condition, a thermoplastic polymer is continuously stretched and wound on a winder. In such a case, the thermoplastic polymer can be smoothly transferred by sliding contact with the thermoplastic polymer, or in the manufacturing process of a plastic container such as a PET bottle, a packaging container such as a metal container or a glass container, When each of the packaging containers discharged from the manufacturing machine is continuously transferred, or each of the manufactured packaging containers is continuously filled with a drink such as milk or juice or a medicine. When transporting, each of the packaging containers can be smoothly slidably brought into contact with the bottom surface or the side surface of each of the packaging containers. In the manufacturing process of a metal or glass molded product, when the molded product discharged from the manufacturing machine is continuously transferred, the molded product is in sliding contact with the bottom surface or side surface of the molded product. In addition, the sheet can be smoothly slid in contact with the sheet or tape in the winding process of the sheet such as a synthetic resin sheet or cloth, or the tape. The present invention relates to a guide member used in an article transfer process and a manufacturing method thereof.

Conventionally, used in the transfer process of thermoplastic polymers, plastic containers, packaging containers such as metal containers and glass containers, or plastic, metal and glass molded products, and articles such as sheets and tapes. As the guide member to be used, a base metal is plated and the guide surface is simply finished in a mirror state.

Further, when a past patent document is searched retrospectively for a guide member used in an article transfer process, the one disclosed in Patent Document 1 below is known. That is, the guide member described in Patent Document 1 includes a first step of buffing the surface of a base material made of metal or a hard synthetic resin, and a number of surfaces on the surface of the base material polished in the first step. A second step of forming a concavo-convex surface, a third step of polishing and removing a protrusion tip of the convex surface among a plurality of concavo-convex surfaces formed in the second step, and smoothing the convex surface; A plating coating that increases the surface hardness is applied to the base material from which the protrusion tip of the convex surface has been removed in the process.
A fourth step of forming a surface film by leaving the uneven surface after the plating coating, and performing a surface treatment by polishing the tip of the convex surface of the uneven surface plated and coated in the fourth step. It is manufactured through a fifth step of forming a smooth or curved surface-shaped sliding contact surface on the part.

Japanese Patent No. 3523215

However, since the guide member used in the conventional transfer process has a mirror finished surface, a thermoplastic polymer or plastic container, a packaging container such as a metal container or glass container, or a plastic or metal Since the contact area with a molded product made of glass or glass, or an article such as a sheet or a tape increases, and as a result, the frictional resistance increases, the thermoplastic polymer, or an article such as a packaging container or molded product During the transfer, there was a problem that it could not be transferred smoothly.

In addition, the guide member described in Patent Document 1 is a thermoplastic polymer that has a smooth or curved surface on the final finished surface of the convex surface portion of the base material constituting the guide member made of metal or hard synthetic resin. Or by reducing the contact area with packaging containers, molded products, or articles to be transported, such as sheets or tapes, the frictional resistance can be reduced and the goods can be transported smoothly. Pursuing only the point of achieving the above, it is not considered at all to obtain a guide member excellent in antifouling property that is difficult to adhere dirt and easy to clean, and can be obtained by the processing method described in Patent Document 1. Further, the guide member has a problem that it is inferior in antifouling properties and cleanability.

The present invention has been made to solve the above-mentioned problems, and by reducing the contact area with the article, the frictional resistance is reduced, the article can be smoothly transferred, and the chromium plating surface It is an object of the present invention to provide a guide member used in an article transfer process having improved antifouling properties and cleanability while maintaining low friction characteristics and wear resistance, and a method for manufacturing the guide member.

The guide member used in the article transfer process of the present invention that solves the above problems has the following configuration (1).
(1) A guide member having a satin-shaped chromium plating layer having a metal base surface electroplated with a chromium compound and having a surface roughness of 0.3 to 5 μm with an arithmetic average roughness Ra according to JIS-B0601: 2001. A guide member used in an article transfer process, wherein the surface of the chromium plating layer is coated with a polysiloxane bond (Si-O-Si) straight silicon resin.

Further preferably, it is recommended that the guide member used in the article transfer process of the present invention has the following configurations (2) to (6) in addition to the above configuration.
(2) The film thickness of the silicon resin layer is 10 to 1500 μm.
(3) The film hardness of the chromium plating layer is Hv 950 to 1300.
(4) The chromium compound contains 1 to 8% of a chromium carbide alloy (Cr ₂₃ C ₆ ).
(5) The chromium plating layer has a thickness of 10 to 200 μm.

Moreover, the manufacturing method of the guide member used in the transfer process of the articles | goods of this invention which solves the said subject has the structure of following (6).
(6) The surface of the metal base material is subjected to a blast treatment with an arithmetic average roughness Ra according to JIS-B0601: 2001 of 0.3 to 5 μm, and then subjected to an electroplating treatment with a chromium compound to obtain a film thickness of 10 A guide used in an article transfer process, characterized in that a chromium plating layer having a thickness of ˜200 μm is formed, and then the surface of the chromium plating layer is formed with a polysiloxane bond (Si—O—Si) straight silicon resin. Manufacturing method of member.

Still preferably, the guide member manufacturing method of the present invention preferably has the following configurations (7) and (8) in addition to the above configuration.
(7) The silicon resin film has a thickness of 10 to 1500 μm.
(8) The chromium compound contains 1 to 7% of a chromium carbide alloy (Cr ₂₃ C ₆ ).

According to the present invention, a guide member used in an article transfer process and a method for manufacturing the same that can solve the above-described problems can be obtained by adopting the above-described configurations.

According to the present invention, by reducing the contact area with the article, the frictional resistance is reduced, the article can be smoothly transferred, and the low friction characteristic and wear resistance of the chrome plating surface are maintained. In addition, it is possible to provide a guide member used in the article transfer process with improved antifouling properties and cleanability.

The present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the guide member used in the article transfer process of the present invention is such that the surface of the metal base material 1 is electroplated with a chromium compound, and the surface roughness is an arithmetic average according to JIS-B0601: 2001. A chrome plating layer 2 having a matte shape with a roughness Ra of 0.3 to 5 μm is formed, and the surface of the chrome plating layer 2 is formed with a polysiloxane bond (Si—O—Si) straight silicon resin 3. Yes.

In addition, the guide member used in the said article | item transfer process means all the surfaces of metals, such as iron, aluminum, and titanium, which are base materials, which are electroplated with a chromium compound.

Hereinafter, the details of the present invention will be described by taking a guide member as an example of a guide member used in a synthetic fiber yarn portion process on behalf of the guide member. As described above, it is essential for the guide member of the present invention to form a silicon resin film on the chromium plating layer of the guide member that has been subjected to chromium plating.

The silicon resin does not need to be a special one, and a commercially available product is sufficient. Commercial products include organic and inorganic types, and the former organic type has been used for many years because it is inexpensive and relatively easy to handle. However, since organic solvents are used, the latter inorganic ones have become commercially available in recent years from the viewpoint of adverse effects on human bodies such as various allergies caused by organic solvents and pollution such as disposal of treatment agents. It was. That is, the inorganic silicone resin is characterized by almost no odor and harmless to the human body.

As the organic type, there are a liquid type in which a silicon resin is dissolved in an organic solvent, and a modified silicon resin in which an alkyd resin, an acrylic resin, a phenol resin, an epoxy resin, and the like are further mixed. On the other hand, inorganic materials include acrylic silicon resin having an alkoxysil group at the terminal, and straight silicon resin (ceramic) having a basic skeleton of polysiloxane bond (Si—O—Si).

In order to achieve the above object, the present inventor has conducted intensive research on the selection of a coating resin, and as a result, a polysiloxane bond (Si—O—Si) straight silicon resin in the inorganic silicon resin described above is obtained. It has been found that it is most effective as a metal coating material. That is, the straight silicon resin (ceramic) is excellent in heat resistance, rich in flexibility, and has a characteristic that it is difficult to crack. Particularly, a guide member used under high temperature conditions, for example, a take-up roller used in a yarn making process. It was found to be particularly effective for a guide member such as a stretching roller.

Furthermore, the polysiloxane bond (Si—O—Si) straight silicon resin has very good adhesion between the chromium plating layer and the silicon resin film, and can be used for a long time.

When the polysiloxane bond (Si-O-Si) straight silicon resin is used for guide members such as the take-up roller and the drawing roller, carbides such as oil that have precipitated during drawing are less likely to adhere (antifouling property). ), It is easy to work (cleanability) because dirt is easily removed by alkali cleaning of a drawing roller or the like that is regularly performed.

As for the silicon resin film thickness of the guide member of this invention, 10-1500 micrometers is preferable. If the resin film thickness is less than 10 μm, it is difficult to smooth the resin layer, and the antifouling and cleaning effects of the silicon resin are reduced. When the resin film thickness exceeds 1500 μm, the low-friction characteristic of the satin finish characteristic is deteriorated, peeling from the chrome plating layer, and cracking occur. Further, in the case of a hot stretching roller or the like used through heat, there is a problem that the thermal efficiency is lowered, which is not practical.

It is most desirable that the silicon resin film is uniformly coated on the peaks and valleys of the chrome plating layer, but when applied by spraying or brushing, the arithmetic average roughness even if the valleys are coated thicker. If Ra is in the range of 0.3 to 5 μm, there is no particular problem.

Next, the prescription when using an inorganic straight silicon resin will be described. As a coating method of silicon resin, there is application or spray spraying, etc., which is appropriately selected according to the shape, size, workability, etc. of the guide member, but spray spraying is performed from the viewpoint of workability, uniform adhesion, etc. preferable.

It is preferable to use the silicon resin concentration in the range of 20 to 60% by weight. If the concentration is less than 20% by weight, the adhesion to the chrome plating surface is lowered. If it exceeds 60% by weight, the silicon resin film becomes non-uniform and causes peeling, which is not preferable.

In the case of a straight silicon resin, the resin drying after coating is preferably performed in the range of room temperature to 150 ° C., but it is desirable to dry at a low temperature for as long as possible. Most preferred is natural drying at room temperature.

Forced drying at a high temperature of 150 ° C. or higher is not preferable because it impairs the flexibility of the silicon resin film and lowers the adhesion to the chromium plating surface. Accordingly, it is desirable to appropriately adopt the drying conditions in consideration of the type (characteristics) of silicon resin, concentration, resin film thickness, workability, and the like.

When the guide member of the present invention displays the surface roughness of the chromium plating layer formed on the surface of the metal base material by the method defined in JIS-B0601: 2001, the arithmetic average roughness Ra is 0. 3 to 5 μm is essential.

When the arithmetic average roughness Ra is less than 0.3 μm, the surface is almost smooth with no surface irregularities, so that the contact area of the yarn with the surface of the guide member increases and the frictional resistance increases. Thread breakage increases. Further, when the arithmetic average roughness Ra exceeds 5 μm, the difference in unevenness becomes large, so that fluff and yarn breakage are likely to occur in the fiber yarn. Therefore, as described above, it is very important to design the chrome plating surface to have a roughness corresponding to the purpose of use of the guide member.

As described above, in order to make the guide member excellent in antifouling property and cleanability while maintaining the low friction and abrasion resistance antifouling properties aimed by the present inventor, It has been found that not only the coating treatment but also the blast treatment described below can be used together to exhibit a particularly remarkable antifouling property.

The reason for this is that the surface of the guide member has been blasted to create an uneven shape, which reduces the contact area and makes it difficult for dirt to adhere to it, and further coats it with a silicon resin that has antifouling properties. By doing so, it is thought that it appears as a synergistic effect of both.

Usually, the contact angle with water is used as an index of antifouling properties such as metal or cloth surface, and it is said that the smaller this value, the better the antifouling property, and the guide member of the present invention has this contact angle. This was also proved from the measurement results.

In general, blasting uses compressed air (0.2-0.5 MPa) and blasting materials (alumina grid, emery (sand), SUS balls, glass beads, etc.) on the surface of a metal base material. Spray (collision) to roughen the surface of the metal base material. On the surface of the metal base material, a dull (mountain / valley shape) having an innumerable random arrangement is formed.

Since the surface is a sharp edged dull, if the chrome plating treatment is performed in this state, a chrome plating layer having a large number of fine protrusions is formed by reflecting the ground. Further, the size of the blast material particles is not strictly constant, and is composed of an aggregate of particles having a specified range. That is, the surface roughness obtained by the blast treatment is not constant, and the particle size variation of the blast material is reflected. In order to avoid the problems described above, it is important to further polish the surface of the metal base material after the blast treatment.

The film hardness (room temperature Hv) of the chromium plating layer formed on the surface of the metal base material is preferably in the range of 950 to 1300. Preferably, it is the range of 1000-1300. If it is less than 950, for example, when a fiber yarn containing an inorganic additive such as titanium oxide, magnesium oxide, carbon black, and bengara is drawn into the molten polymer, wear significantly occurs. That is, it is difficult to obtain a target guide member having high wear resistance.

Generally, the film hardness of the chromium plating layer is determined by the amount of chromium carbide alloy (Cr ₂₃ C ₆ ) produced.

In order to make the film hardness of the chromium plating layer of the guide member in the range of 950 to 1300 in the chromium plating processing, a chromium carbide alloy (particularly on the surface or near the surface of the chromium plating layer or the entire chromium plating layer ( It is important to increase the amount of Cr ₂₃ C ₆ ).

In general, chrome plating generates a large amount of internal stress and chromium (Cr) that absorbs a large amount of hydrogen (H), whereas chrome plating contains high-purity carbon (C) composed of the aforementioned compounds. By using a mixed catalyst such as a polymer compound, a chromium carbide alloy with a high degree of intermolecular bond can be formed on the plating surface layer, and a high concentration can be formed even inside the plating layer. It becomes possible to obtain a hard chromium plating layer.

Next, the details of chromium plating for forming a film of a chromium (Cr) compound containing a chromium carbide alloy (Cr ₂₃ C ₆ ) will be described.

In the method of manufacturing a guide member for forming a chromium plating layer on the surface of a metal base material by electroplating in chromic anhydride, the ripple content of the rectifier used during the electroplating is controlled to 5% or less. and, it is important that and the current density is treated with 20~220A / dm ^2.

The chromium plating film forming method in the electroplating method used in the present invention is made possible by using a special bath (Sargent bath modification). As a bath component, a powder composed of a polymer compound containing chromic anhydride and high-purity carbon (C) is mixed and treated at a bath temperature of about 60 ° C. In order to form a chromium (Cr) compound containing a chromium carbide alloy (Cr ₂₃ C ₆ ), a current density (40 to 220 A / dm ² ) about 2 to 2.5 times that of chromium plating is usually required.

What is important in the plating process is how to select the optimum current density according to the surface area of the substrate to be processed and how to suppress the ripple generation rate in the rectifier.

Generally, electroplating is performed by direct current. For that purpose, it is necessary to convert from alternating current to direct current, and the function is performed by a rectifier. This rectifier is roughly classified into a switching type and an inverter type, and the former is a type in which the negative and positive electrodes are respectively picked up (pickup) and switched to direct current by alternately switching alternating current electricity with a semiconductor.

At this time, in general, noise is generated by alternately switching the alternating current electricity, which is the process, and a good waveform cannot be obtained. Therefore, it is generally used as a rectifier in electroplating. Not.

In the latter, AC electricity is changed from AC to DC by an inverter. For this reason, it is possible to generate a large direct current with less power by generating less noise and further amplifying the frequency. Therefore, it is preferable to select an inverter type for the electroplating rectifier.

The high-purity carbon (C) polymer compound used at this time includes a carbon compound composed of starch, cellulose, protein, natural rubber, polyethylene, nylon, synthetic rubber, phenol resin, and urea resin. When any of the polymer compounds is electroplated with a liquid mixed with chromic anhydride (pH 2 to 4), a large amount of chromium carbide alloy (Cr ₂₃ C ₆ ) is produced, and high hardness chromium (Cr ) It becomes possible to form a film of the compound.

The content of the chromium carbide alloy (Cr ₂₃ C ₆ ), which is the high hardness chromium (Cr) compound, is preferably 1 to 8%. If it is less than 1%, the hardness of the chromium plating layer is low and the wear of the guide member surface tends to be inferior. On the other hand, if it exceeds 8%, the hardness of the chromium plating layer becomes hard and brittle against impacts. This is not preferable.

Next, the film forming thickness of the chromium plating layer in the present invention is preferably 10 to 200 μm. Furthermore, it is preferably 30 to 100 μm.

It should be noted that plating treatment with a film thickness of less than 10 μm is difficult to put into practical use at the present time due to the problem that the film thickness cannot be uniformly controlled. In addition, mechanical damage such as bruises and durability such as wear resistance may be insufficient. However, a thickness exceeding 200 μm has already saturated the effect and increases the cost of the plating process. It is not preferable.

In the guide member of the present invention, a chromium plating layer obtained by electroplating a chromium (Cr) compound is formed on the surface of a metal base material. The material of the metal base material is not particularly limited as long as it is a metal, but preferably stainless steel is preferred as a steel material such as chrome molybdenum steel and carbon steel for machine structural use, and as a guide member disposed in a place with much moisture. used.

Next, although the manufacturing method of this invention guide member is demonstrated, the manufacturing method of a guide member is not limited to this.

The guide member of the present invention can be manufactured by the following manufacturing processes (1) to (9). (1) Polishing step, (2) Metal base material surface cleaning step, (3) Alkali cleaning step, (4) Roughness adjusting step roughened by blasting, (5) Polishing step, (6) Water washing The guide member is completed through the process, (7) chromium plating treatment process, (8) silicon resin processing process, and (9) surface cleaning process. Details of each step are described below.

By the polishing step (1), the surface of the metal base material is polished (mirror polishing). The abrasive used for the polishing process is preferably artificial diamond (industrial diamond), alumina, blue bar (Cr ₂ O ₃ ), tripoly, and the like, and thereby polishes to a mirror state. Here, the mirror surface state is an arithmetic average roughness Ra of 0.05 to 0.2 μm.

In order to finish the entire surface of the substrate evenly in the roughness adjustment step of roughening by blasting in the fourth step (4), the mirror polishing process is performed first on the surface of the metal base material to be plated It is important to polish the surface to have a uniform roughness (mirror surface).

The metal base material surface cleaning step (2) is for facilitating the formation of a film on the surface of the metal base material. First, the base material of the guide member is washed with an organic solvent such as ethanol, thinner, trichloro, or ethylene. Degrease the surface. As the cleaning liquid, ethanol is preferable from the viewpoint of safety and environment.

Next, in the alkali cleaning step (3), alkali cleaning (soaking and degreasing) is performed to further improve the adhesion between the chromium plating layer and the surface of the metal base material. Adhesion is enhanced by saponifying, emulsifying, swelling and removing the oil on the surface of the metal base material.

The arithmetic average roughness Ra roughened by blasting in the roughness adjusting step of roughening the metal base material surface by blasting (4) is 0.3 to 5 μm.

As the blasting material used for the roughening, alumina grid, emery (sand), SUS balls, glass beads and the like are preferable, and among these, alumina grid and emery (sand) are particularly preferable.

As a blasting method, it is preferable to process the metal base material while rotating it on a turntable. At this time, the torch (gun) for injecting the blast material is arranged at a right angle to the metal base material, and the blast material hits the surface of the metal base material uniformly while reciprocating the torch in the axial direction of the metal base material. It is recommended that the spraying pressure be 0.2 to 0.5 MPa.

Further, in the polishing step (5), polishing is performed to finish the sharp edged dull on the surface of the metal base material obtained in the step (4), so the polishing step performed in the step (1) In addition to the different meanings, naturally different abrasives are used.

By correcting abnormal peaks at the base stage (peak cut) by the polishing step, the generation of fine projections can be remarkably suppressed. A preferable range is polishing about 0.7 to 20% of the height of the dull, and more preferably 0.9 to 1.3%. The abrasive is preferably a soft material with fine mesh, such as non-woven fabric, linen, and paper towel.

Next, in the water washing step (6), it is necessary to sufficiently remove the blast residue attached to the surface of the metal base material in the steps (4) and (5). If plating is applied in the presence of this residue, a film will be formed in a state of enveloping the residue, and it will not fit in the roughness form within the specified range, and it will become fine abnormal projections, The thing is removed. Therefore, it is preferable to wash with high pressure water. It is effective when the pressure of the high-pressure water is 0.5 to 1.5 MPa. Then, it is more preferable to dry with normal temperature or heated air.

Next, in the chromium plating treatment step (7), a chromium (Cr) compound containing a chromium carbide alloy (Cr ₂₃ C ₆ ) is formed by electroplating. Use a special bath (Sargent bath). As a bath component, a powder composed of a polymer compound containing chromic anhydride and high-purity carbon (C) is mixed and treated at a bath temperature of around 60 ° C., and the film formation time is 10 to 10 mm. In order to make it 200 μm, a film is formed by treating for 2 to 8 hours.

In order to form a chromium (Cr) film containing a chromium carbide alloy (Cr ₂₃ C ₆ ), a current density (40 to 220 A / dm ² ) that is approximately 2 to 2.5 times that of chromium plating is usually required.

Next, in the silicon resin processing step (8), which is an essential requirement of the present invention, the silicon resin is uniformly spray-coated on the chromium plating surface using a sprayer, and then naturally dried over 24 to 300 hours at room temperature. . Before coating, it is important to wash and remove deposits such as oil and dust on the plating surface with high-pressure water in advance. If these deposits remain, the adhesion between the chrome plating surface and the silicon resin is inferior, causing peeling in a practical process.

The silicon resin concentration is preferably in the range of 1 to 30% by weight from the viewpoint of workability such as uniformity of the silicon resin film and film thickness adjustment. If the concentration is less than 1% by weight, there is a problem that the silicon resin liquid is poorly adhered and a wasteful silicon resin film flows out. On the other hand, if the concentration exceeds 30% by weight, it is difficult to form a uniform silicon resin film.

In the surface cleaning step (9), after the silicon resin film is formed in the silicon resin processing step (8), the surface of the silicon resin film is thoroughly washed with hot water and dried with heated air. preferable. Further, it is more preferable to use a draining desiccant to which a surfactant, water-soluble silicon, a fluorine-based solvent or the like is added. The guide member of the present invention is completed through the steps (1) to (9).

In the present invention, the synthetic fiber is a fiber made of a thermoplastic polymer that can be melt-spun and is, for example, polyamide such as nylon 6, nylon 66, nylon 46, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, poly Examples thereof include polyesters such as lactic acid, polyolefins such as polyethylene and polypropylene, polysulfides, polyimides, polyether ketones, and polyether nitriles. Further, it may be a copolymer having the polymer as a main component, a blend of the two or more polymers, or a polymer used in combination.

Next, a film of chromium (Cr) containing a chromium carbide alloy (Cr ₂₃ C ₆ ) is formed on the surface of the drawing roller base material, which is a guide member in the synthetic fiber production yarn production process, by electroplating, An example of a method for producing industrial nylon 66 fiber using a drawing roller processed to have a friction coefficient will be described.

Melt spinning is performed with an extruder type spinning machine using nylon 66 chips having a relative viscosity of sulfuric acid of 3.2 to 3.8. The spinning temperature is 280 to 310 ° C., and the spinning pack is filtered using a 15 μm metal nonwoven fabric filter, and then spun through the die holes. The spun yarn is surrounded by a heating cylinder having a length of 10 to 50 cm installed immediately below the base, passes through a high-temperature atmosphere heated to 270 to 350 ° C., and then cooled by cold air at a normal temperature of 10 to 25 ° C. Solidified.

Next, the yarn is applied with a smoothing agent, an electrostatic agent, and an oil agent mainly composed of a surfactant, wound around a take-up metal member, and taken up at a predetermined take-up speed. The take-up speed is 300 to 3000 m / min, usually 500 to 2000 m / min.

The take-up yarn is wound around a plurality of pair-stretching rollers that are sequentially rotated at a high speed without being wound once, and is stretched by a speed difference between the pair of stretching rollers. Usually, after two or more stages of multi-stretching, the film is relaxed and wound up. Stretching is performed at a glass transition temperature or higher, and final stretching and heat setting temperature is performed at a high temperature of 230 to 250 ° C. or higher. The stretching ratio is 2 to 6 times.

In addition, the drawing roller after taking the surface of the metal base material is blasted into a satin shape, and chromium (Cr) containing chromium carbide alloy (Cr ₂₃ C ₆ ) is electroplated on the surface to form a film, Further, a stretching roller having a surface coated with silicon resin was used. The winding speed was 2000 to 6000 m / min, and the winding tension was 50 to 250 gf.

Examples 1-4, Comparative Examples 1-4
Using a base material made of chrome molybdenum steel, the film forming composition, film forming method, blasting material, film hardness, film thickness, etc., are used to manufacture a drawing roller as a guide member in the synthetic fiber manufacturing yarn manufacturing process by the following process. , Film strength, average friction coefficient, surface arithmetic average roughness Ra, silicon resin coating agent, resin film thickness, 4 types shown in Table 1 (Examples 1 to 4) and 4 types shown in Table 2 (Comparative Examples) The stretching rollers 1 to 4) were produced. The film thickness of the silicon resin was adjusted by the concentration of the resin coating agent or the number of times of resin coating.

The straight silicon resin used here was ECO24 Superflex 2A manufactured by Eco 24 Co., Ltd., and the acrylic silicon resin used was “PTC-05” manufactured by Fujikura Kasei Co., Ltd. Drying was natural drying, and both were left at room temperature for 240 hours. ("PTC-05" is a ratio of acrylic resin having a main resin of Tg = 50 ° C. and an amine amount of 18%, 3-glycidoxypropyltrimethyoxysilane (GPMS) and tetraethoxysilane (TES). Is a two-component acrylic silicone resin comprising a 1: 1 curing agent (mixing ratio; main agent: curing agent = 100: 20))

In Examples 1 to 4 and Comparative Examples 2 to 4, after the chromium roller containing chromium carbide alloy (Cr ₂₃ C ₆ ) was applied to the stretching roller, the roller surface was subjected to a silicon resin coating process. In Comparative Example 1, a film was formed using the same chromium compound as in Examples 1 to 4, and then the silicon resin coating process was not performed.

In addition, the fiber of Examples 1-4 and Comparative Examples 1-4 was manufactured at the following process.
Nelson type stretching rollers having a diameter of 200 mm and a length of 320 mm using the above-mentioned one type of electroplating technology were each set directly on a melt spinning and stretching machine, and using these direct melt spinning and stretching machines, copper acetate as copper was 67 ppm, Nylon 66 polymer having a relative viscosity of 3.7% sulfuric acid containing 0.1% by weight of potassium iodide and 0.1% by weight of potassium bromide is melt-spun, cooled, applied with an oil agent, wound around a take-up roller and taken up. It was. The take-up yarn was drawn by being wound around a Nelson type rotary roller whose speed was continuously increased. The take-up roller was not heated, the feed roller was 45 ° C., the one-stage stretching roller was 150 ° C., the two-stage stretching roller was 230 ° C., and two-stage heat stretching was performed at a stretching ratio of 5 times.

The yarn after hot drawing was given 4% relaxation with a relaxation roller heated to 120 ° C., and then wound with a wind-up winder at 3600 m / min to produce a multifilament of 1400 dtex and 204 filaments. did.

With respect to each stretching member at this time, the friction coefficient, the wear resistance, the stretching roller replacement cycle, the cleaning cycle of the stretching roller, and the cleaning property were measured by the measuring method described below. The results are shown in Table 1.

As a result, in Examples 1 to 4, it was possible to produce fiber yarns with less fluff over a long period of time. That is, all of the results were excellent in antifouling properties such as a small contact angle on the roller surface, little roller contamination, and a long roller cleaning cycle. In addition, the cleaning time is shortened and the cleaning performance is excellent. The roller replacement cycle is the same as the conventional one, and the result is satisfactory from the viewpoint of extending the life of the roller.

On the other hand, in Comparative Example 1, although the roller replacement cycle was maintained, the antifouling property was inferior, such as a large amount of roller contamination and a short roller cleaning cycle.

The friction coefficient, contact angle, roller cleaning cycle, cleaning property, and wear resistance measuring method and evaluation method in Tables 1 and 2 are as follows.

<Friction coefficient>
Using a pin-on-disk friction / wear tester, using a WC ball as the mating material, changing the load from 30 to 200 g and the friction speed from 30 to 80 cm / sec. Draw a chart and read the stable center of the coefficient of friction after running 30m from the top of the chart.

<Contact angle>
The contact angle, which is an index of the antifouling property of the metal surface, is measured by the static method. Specifically, in an atmosphere of 25 ° C., distilled water was dropped on a test piece prepared under the same conditions as in the examples, and the measurement was performed within 1 minute after the water droplets stopped.

<Roller cleaning cycle>
The dirt on the roller surface was judged with the naked eye, and the number of days elapsed until the A rank was reached was measured.
Rank A: Large roller dirt (cannot be used as a roller and requires cleaning)
Rank B: Roller dirty (between large and small)
C rank: Small roller dirt

<Cleanability>
An alkaline aqueous solution was sprayed onto the roller, and the ease of removal of dirt on the roller surface was evaluated by ranking as follows.
Rank A: Very easy to remove dirt Rank B: Easy to remove dirt (between large and small)
C rank: Dirt is hard to remove

<Abrasion resistance>
As an index of the abrasion resistance of the roller, the abrasion state of the roller surface was magnified and observed with an optical microscope, and the number of days elapsed until the A rank of the following standard was reached was measured.
Rank A: Large wear state (cannot be used as a roller)
Rank B: Medium wear (between large and small)
C rank: wear state is small

The guide member of the present invention reduces the frictional resistance by reducing the contact area with the article, enables smooth transfer of the article, and maintains the low friction characteristics and wear resistance of the chrome plating surface. However, because of its excellent antifouling properties and cleanability, it can be used outside of guide members such as take-up rollers and drawing rollers used in the yarn-making process, especially using thermoplastic polymers, plastic containers, metal containers and glass. It can be effectively used as a guide member used in a packaging container such as a container, or a plastic, metal or glass molded product, or a sheet or tape.

It is sectional drawing of this invention guide member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Guide base material 2 Chromium plating layer 3 Straight silicon resin of polysiloxane bond (Si-O-Si)

Claims (8)

The metal base material surface is electroplated with a chromium compound, and the surface roughness is a guide member having a satin-shaped chromium plating layer with an arithmetic average roughness Ra of 0.3 to 5 μm according to JIS-B0601: 2001. A guide member used in an article transfer step, wherein the surface of the chromium plating layer is formed with a polysiloxane bond (Si—O—Si) straight silicon resin. The guide member used in the article transfer step according to claim 1, wherein the silicon resin layer has a thickness of 10 to 1500 μm. The guide member used in the article transfer step according to claim 1 or 2, wherein the chromium plating layer has a film hardness of Hv 950 to 1300. The guide member used in the article transfer step according to claim 1, wherein the chromium compound contains 1 to 8% of a chromium carbide alloy (Cr ₂₃ C ₆ ). The guide member used in the article transfer step according to claim 1, wherein the chromium plating layer has a thickness of 10 to 200 μm. The surface of the metal base material is subjected to a blasting treatment with an arithmetic average roughness Ra according to JIS-B0601: 2001 regulation of 0.3 to 5 μm, and then subjected to an electroplating treatment with a chromium compound. Production of a guide member for use in an article transfer process, characterized in that after the chromium plating layer is formed, the surface of the chromium plating layer is formed with a polysiloxane bond (Si-O-Si) straight silicon resin. Method. The method of manufacturing a guide member used in the article transfer step according to claim 6, wherein the thickness of the silicon resin layer is 10 to 1500 μm. The method for manufacturing a guide member used in the article transfer step according to claim 6, wherein the chromium compound contains a chromium carbide alloy (Cr ₂₃ C ₆ ).

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