JP2022178289A - Roughening method of member, roughening method of conveying surface of conveyance path forming member, surface roughening member, and conveyance path forming member of article - Google Patents

Abstract

To provide a conveying member capable of improving furthermore conveyor processing speed of an article.SOLUTION: In a roughening method, multiple times of wet type blast treatment is applied to a member in each different condition, and then polishing treatment is applied thereto, thus such a rough surface is formed that an arithmetic average height Sa is in the range of 0.10 μm or more and 2.00 μm or less, a root-mean-square gradient Sdq is in the range of 0.10 or more and 0.70 or less, and surface free energy is 40 mJ/m2 or less.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for roughening a member. The invention also relates to a roughened member.

2. Description of the Related Art An apparatus or the like having an article conveying mechanism is generally provided with a conveying path forming member such as a shooter or a guide that constitutes a conveying path of an article. The conveying path forming member is required to have high slidability and slideability from the viewpoint of improving the article conveying processing speed. In order to impart such physical properties to the transport path forming member, the transport path forming member may be subjected to buffing treatment or electrolytic polishing treatment (the applicant believes that such a technique is I know that it is well known in the field, but I am unaware of the existence of any document disclosing this fact.)

By the way, in recent years, there has been a demand for a further improvement in the transportation processing speed of articles. SUMMARY OF THE INVENTION An object of the present invention is to provide a transport path forming member capable of further improving the transport processing speed of an article.

In the method for roughening a member according to the first aspect of the present invention, the member is subjected to wet blasting multiple times under different conditions and then to polishing, so that the arithmetic mean height Sa is 0.10 μm. 2.00 μm or less, the root mean square gradient Sdq is 0.10 or more and 0.70 or less, and the surface free energy is 40 mJ/m ² or less. be. Note that the arithmetic mean height Sa and the root mean square gradient Sdq are defined in ISO 25178. The surface free energy is calculated from the contact angle of pure water and the contact angle of diiodomethane by the Owens and Wendt model formula.

As a result of intensive studies by the inventors of the present application, it was found that by using this method of roughening a member, a metal component having higher sliding properties and sliding properties than members subjected to buffing and electrolytic polishing can be produced. It became clear that it is possible. Therefore, by implementing this member surface roughening method, it is possible to realize a further improvement in the transportation processing speed of articles (especially foods, foods, etc., that contain relatively abundant moisture, oil, etc.). A passage forming member can be manufactured.

A member surface roughening method according to a second aspect of the present invention includes a first wet blasting process, a second wet blasting process, and a polishing process. The terms "first" and "second" used here are used only to indicate relative differences, and are used to indicate absolute order. (i.e., if the wet blasting process is performed three or more times, the first wet blasting process and the second wet blasting process referred to herein are the first two wet blasting processes. means the last two wet blasting steps.). In the first wet blasting step, the member is wet blasted under a first condition to produce a member having a first rough surface. In addition, before the first wet blasting process, the member may be subjected to one or more wet blasting processes. In the second wet blasting step, the member having the first rough surface is wet blasted under a second condition to produce a member having the second rough surface. Note that the second condition is different from the first condition here. In the polishing step, the member having the second rough surface is subjected to polishing processing to produce a member having the third rough surface. Here, the third rough surface has an arithmetic mean height Sa within the range of 0.10 μm or more and 2.00 μm or less, and a root mean square gradient Sdq within the range of 0.10 or more and 0.70 or less. and the surface free energy is 40 mJ/m ² or less. Also, the arithmetic mean height Sa and the root mean square gradient Sdq are specified in ISO 25178. The surface free energy is calculated from the contact angle of pure water and the contact angle of diiodomethane by the Owens and Wendt model formula.

As a result of intensive studies by the inventors of the present application, it has been found that by using this method of roughening a member, it is possible to produce a member having higher sliding properties and sliding properties than members subjected to buffing or electropolishing. It became clear that it was possible. Therefore, by implementing this member surface roughening method, it is possible to realize a further improvement in the transportation processing speed of articles (especially foods, foods, etc., that contain relatively abundant moisture, oil, etc.). A passage forming member can be manufactured.

A member surface roughening method according to a third aspect of the present invention is the member surface roughening method according to the second aspect, wherein the conditions include an average diameter of abrasive grains, and the abrasive grains with respect to the dispersion medium contains at least one factor of the blending ratio of

A member surface roughening method according to a fourth aspect of the present invention is the member surface roughening method according to the third aspect, wherein the average diameter of the abrasive grains under the second condition is the average diameter of the abrasive grains under the first condition smaller than diameter.

A member surface roughening method according to a fifth aspect of the present invention is the member surface roughening method according to the third or fourth aspect, wherein the first wet blasting step and the second wet blasting step include: Two or more types of abrasive grains having different average diameters are used as the abrasive grains. In this case, the average diameter of the two or more types of abrasive grains used in the second wet blasting step should be smaller than the average diameter of the largest abrasive grains used in the first wet blasting step.

The member according to the sixth aspect of the present invention has an arithmetic mean height Sa within the range of 0.10 μm or more and 2.00 μm or less, and a root mean square gradient Sdq within the range of 0.10 or more and 0.70 or less. and has a rough surface with a surface free energy of 40 mJ/m ² or less.

As a result of intensive studies by the inventors, it has become clear that the member having the above-described rough surface has higher sliding properties and slipping properties than members subjected to buffing treatment or electropolishing treatment. Therefore, by using this member as a conveying path forming member, it is possible to realize a further improvement in the conveying processing speed of articles (particularly those containing relatively abundant water, oil, and the like, such as foodstuffs and foodstuffs).

A member according to a seventh aspect of the present invention is the member according to the sixth aspect, wherein the arithmetic mean height Sa is in the range of 0.10 μm or more and 0.30 μm or less, and the root mean square gradient Sdq is 0.10. It is in the range of 0.30 or less, and the surface free energy is in the range of 25 mJ/m ² or more and 35 mJ/m ² or less.

As a result of diligent studies by the inventors of the present application, it has been found that buffing and electropolishing are particularly suitable for cut vegetables (cut cabbage, etc.), cut fruits (cut pineapple), and tablet-shaped snacks (ramune). It was found to have higher sliding properties and sliding properties than the member to which it was applied.

The member according to the eighth aspect of the present invention is the member according to the sixth aspect, wherein the arithmetic mean height Sa is in the range of 0.50 μm or more and 1.00 μm or less, and the root mean square gradient Sdq is 0.30. It is in the range of 0.50 or less, and the surface free energy is in the range of 25 mJ/m ² or more and 35 mJ/m ² or less.

As a result of intensive studies by the inventors of the present application, the member having the above-mentioned rough surface, especially for dried fish, wiener sausages, and hard candy, has higher sliding properties and slipping properties than members subjected to buffing or electropolishing. It was made clear.

The member according to the ninth aspect of the present invention is the member according to the sixth aspect, wherein the arithmetic mean height Sa is in the range of 1.00 μm or more and 2.00 μm or less, and the root mean square gradient Sdq is 0.50. It is in the range of 0.70 or less, and the surface free energy is in the range of 25 mJ/m ² or more and 35 mJ/m ² or less.

As a result of intensive studies by the inventors of the present application, the member having the rough surface has higher sliding property and sliding property than members subjected to buffing treatment or electrolytic polishing treatment, especially for frozen hamburgers, waffles, and deep-fried tofu. It was found to have

Bar graphs comparing the sliding angles of cut vegetables (cut cabbage, etc.), cut fruits (cut pineapple), and tablet-shaped sweets (ramune) on the treated surfaces of the test plates of Example 1, Comparative Example 1, and Comparative Example 2. be. FIG. 10 is a bar graph comparing the sliding angles of dried fish, wieners, and hard candy with respect to the surfaces to be treated of the test plates of Example 2, Comparative Example 1, and Comparative Example 2; 2 is a bar graph comparing the sliding angles of frozen hamburgers, waffles, and deep-fried tofu with respect to the surfaces to be treated of the test plates of Example 3, Comparative Examples 1 and 2. FIG.

<Roughened member according to the embodiment of the present invention>
The surface-roughened member according to the embodiment of the present invention is, for example, a food manufacturing/processing device having a transport line for transporting foodstuffs and processed foods (e.g., weighing machines, filling machines, packaging machines, transporting/discharging machines, etc.). ) hoppers, shooters, chutes, buckets, slicers, guides, belts, rolls, and the like. In addition, this surface-roughening member may be formed of metal or resin. Examples of such metals include stainless steel (eg, SUS304, SUS316, etc.), aluminum alloys, SS materials (eg, SS400, etc.), and the like. In this roughened member, the arithmetic mean height Sa is within the range of 0.10 μm or more and 2.00 μm or less, and the root mean square gradient Sdq is within the range of 0.10 or more and 0.70 or less, A rough surface having a surface free energy of 40 mJ/m ² or less is defined as a sliding surface or a sliding surface.

Note that the arithmetic mean height Sa, the root mean square gradient Sdq and the surface free energy cannot be adjusted independently. Although the parameters of the rough surface according to representative examples of which the effects have been confirmed at present are as follows, the present invention is not limited to these representative examples.

(Representative example 1)
Arithmetic mean height Sa: 0.10 μm or more and 0.30 μm or less Root mean square gradient Sdq: 0.10 or more and 0.30 or less Surface free energy: 20 mJ/m ² or more and 30 mJ/m ² or less In addition, such a rough surface is particularly effective in improving the gliding and sliding properties of cut vegetables (cut cabbage, etc.), cut fruits (cut pineapple), and tablet-type confectionery (ramune).

(Representative example 2)
Arithmetic mean height Sa: within the range of 0.50 μm or more and 1.00 μm or less Root mean square gradient Sdq: within the range of 0.30 or more and 0.50 or less Surface free energy: 25 mJ/m ² or more and 35 mJ/m ² or less In addition, such a rough surface is particularly effective in improving the gliding and sliding properties of dried fish, wieners, and hard candy.

(Representative example 3)
Arithmetic mean height Sa: within the range of 1.00 μm or more and 2.00 μm or less Root mean square gradient Sdq: within the range of 0.50 or more and 0.70 or less Surface free energy: 25 mJ/m ² or more and 35 mJ/m ² or less In addition, such a rough surface is particularly effective in improving the gliding and sliding properties of frozen hamburgers, waffles, and deep-fried tofu.

<Method for producing surface-roughened member according to embodiment of the present invention>
By the way, the roughened member according to the embodiment of the present invention is manufactured through a first wet blasting process, a second wet blasting process and a polishing process. In addition, if necessary, a pretreatment step may be performed before the first wet blasting step. These steps are described in detail below.

(1) First wet blasting step In the first wet blasting step, the member is subjected to wet blasting under a first condition to produce a member having a first rough surface.

Items of the first condition include, for example, the shape and structure of the abrasive grains, the material of the abrasive grains, the average particle size (50% particle size) of the abrasive grains, the type of the dispersion medium, the ratio of the abrasive grains to the dispersion medium, and the abrasive grains. The ejection pressure of the dispersion, the ejection angle of the abrasive dispersion, the distance from the abrasive dispersion injection nozzle to the surface to be treated, the treatment time, and the like can be mentioned.

The shape of the abrasive grains is preferably polygonal or spherical. The structure of the abrasive grains is preferably a single layer structure. The material of the abrasive grains is preferably ceramic. The dispersion medium is preferably water. It is preferable to disperse two or more types of abrasive grains having different average particle sizes in the dispersion medium. When two types of abrasive grains with different average particle sizes are dispersed in the dispersion medium, the abrasive grains with the larger average particle size should be contained within the range of 4.5 g or more and 8.5 g or less per 100 g of the dispersion medium. is preferably contained within the range of 5.0 g or more and 8.0 g or less, and the abrasive grains having a small average particle size are contained within the range of 1.0 g or more and 3.5 g or less per 100 g of the dispersion medium. is preferably contained within the range of 1.5 g or more and 3.0 g or less. The discharge pressure of the abrasive dispersion is preferably in the range of 0.2 MPa or more and 0.5 MPa or less. The ejection angle of the abrasive dispersion liquid is preferably in the range of 60° or more and 90° or less with respect to the surface to be treated. It is preferable that the distance from the abrasive grain dispersion injection nozzle to the surface to be treated is in the range of 50 mm or more and 200 mm or less. The treatment time is preferably 5 minutes or more when treating an area of 300 mm×300 mm, for example.

In order to form a rough surface having the parameters of Representative Example 1 above, abrasive grains having an average particle diameter within the range of 15 μm or more and 25 μm or less (hereinafter sometimes referred to as “large abrasive grains”) and 1 μm or more and 3 μm It is preferable to disperse abrasive grains (hereinafter sometimes referred to as "small abrasive grains") having an average particle size within the following range in a dispersion medium. In such a case, it is preferable that the large abrasive grains are contained in the dispersion medium within the range of 4.5 g or more and 5.5 g or less per 100 g of the dispersion medium, and the small abrasive grains are contained in the dispersion medium of 2.0 g or more per 100 g of the dispersion medium. It is preferably contained in the dispersion medium within the range of 3.0 g or less.

In order to form a roughened surface having the parameters of Representative Example 2 above, abrasive grains having an average particle diameter within the range of 95 μm or more and 105 μm or less (hereinafter sometimes referred to as “large abrasive grains”) and 15 μm or more and 25 μm It is preferable to disperse abrasive grains (hereinafter sometimes referred to as "small abrasive grains") having an average particle size within the following range in a dispersion medium. In such a case, it is preferable that the dispersion medium contains 6.0 g or more and 7.0 g or less of the large abrasive grains per 100 g of the dispersion medium, and the small abrasive grains of 1.5 g or more per 100 g of the dispersion medium. It is preferably contained in the dispersion medium within the range of 2.5 g or less.

Further, in order to form a rough surface having the parameters of Representative Example 3 above, abrasive grains having an average particle diameter within the range of 395 μm or more and 405 μm or less (hereinafter sometimes referred to as “large abrasive grains”) and 45 μm or more and 55 μm It is preferable to disperse abrasive grains (hereinafter sometimes referred to as "small abrasive grains") having an average particle size within the following range in a dispersion medium. In such a case, it is preferable that the dispersion medium contains 7.5 to 8.5 g of large abrasive grains per 100 g of dispersion medium, and 1.0 g or more of small abrasive grains per 100 g of dispersion medium. It is preferably contained in the dispersion medium within the range of 2.0 g or less.

(2) Second wet blasting process In the second wet blasting process, the member having the first rough surface is subjected to wet blasting under the second condition to produce a member having the second rough surface. .

The items of the second condition are the same as the items of the first condition, and include, for example, the shape and structure of the abrasive grains, the material of the abrasive grains, the average particle size of the abrasive grains (50% particle size), the type of dispersion medium, These include the ratio of abrasive grains to the dispersion medium, the discharge pressure of the abrasive grain dispersion liquid, the discharge angle of the abrasive grain dispersion liquid, the processing time, and the like.

The shape of the abrasive grains is preferably polygonal or spherical. The structure of the abrasive grains is preferably a single layer structure. The material of the abrasive grains is preferably ceramic. The average particle size of the abrasive grains used here is smaller than the average particle size of the abrasive grains used in the first wet blasting step. The dispersion medium is preferably water. It is preferable to disperse two or more types of abrasive grains having different average particle sizes in the dispersion medium. When two types of abrasive grains having different average particle diameters are dispersed in the dispersion medium, the abrasive grains having the larger average particle diameter should be contained within the range of 5.5 g or more and 7.5 g or less per 100 g of the dispersion medium. is preferably contained within the range of 6.0 g or more and 7.0 g or less, and the abrasive grains having a small average particle size are contained within the range of 0.1 g or more and 2.0 g or less per 100 g of the dispersion medium. is preferably contained within the range of 0.5 g or more and 1.5 g or less. The discharge pressure of the abrasive dispersion is preferably in the range of 0.1 MPa or more and 0.3 MPa or less. The ejection angle of the abrasive dispersion liquid is preferably within the range of 30° or more and 60° or less with respect to the surface to be treated. It is preferable that the distance from the abrasive grain dispersion injection nozzle to the surface to be treated is in the range of 50 mm or more and 300 mm or less. The treatment time is preferably 4 minutes or more when treating an area of 300 mm×300 mm, for example.

Further, in order to form a rough surface having the parameters of representative examples 1 to 3, abrasive grains having an average particle diameter within the range of 1.5 μm or more and 2.5 μm or less (hereinafter sometimes referred to as “large abrasive grains”) ) and abrasive grains having an average particle diameter within the range of 0.1 μm or more and 1.0 μm or less (hereinafter sometimes referred to as “small abrasive grains”) are preferably dispersed in a dispersion medium. In such a case, the large abrasive grains are preferably contained in the dispersion medium in an amount of 5.0 g or more and 7.0 g or less per 100 g of the dispersion medium, and the small abrasive grains are preferably contained in 0.5 g or more per 100 g of the dispersion medium. It is preferably contained in the dispersion medium within the range of 2.5 g or less.

(3) Polishing process In the polishing process, the member having the second rough surface is subjected to a polishing process to produce a member having the third rough surface. In this polishing treatment step, various polishing treatments may be performed as long as the gist of the present invention is not compromised, but special polishing treatment is preferably performed.

In the special polishing treatment, particles in which fine abrasive grains are layered on an elastic core material such as resin or rubber are slid on the second rough surface by compressed air or centrifugal force. Here, the particles are preferably particles in which a resin core is coated with abrasive grains. The diameter of the core is preferably in the range of 0.1 mm or more and 0.8 mm or less, and the diameter of the abrasive grains is preferably in the range of 1.0 μm or more and 8.0 μm or less. is preferably in the range of 0.1 MPa or more and 0.5 MPa or less. In addition, the projection angle of the particles is preferably in the range of 30° or more and 60° or less with respect to the surface to be treated, and the treatment time is, for example, 9 minutes or more when treating an area of 300 mm × 300 mm. preferable.

In this polishing step, the arithmetic mean height Sa is in the range of 0.10 μm or more and 2.00 μm or less, the root mean square gradient Sdq is in the range of 0.10 or more and 0.70 or less, and , the surface to be treated is roughened so that the surface free energy is 40 mJ/m ² or less.

(4) Pretreatment step The pretreatment step is preferably performed when the arithmetic mean height Sa of the surface to be treated of the member is 1.0 μm or more. This is to obtain a surface with a desired degree of roughness in the second wet blasting process and polishing process, which are subsequent steps. Examples of the pretreatment include polishing treatment such as special polishing. In the special polishing process, particles made by laminating fine abrasive grains on an elastic core material such as resin or rubber are slid on the surface to be treated by compressed air or centrifugal force, and unevenness is formed by cutting, polishing, etc. Scratches are removed and surface roughness is reduced. Here, the particles are preferably particles in which a resin core is coated with abrasive grains. The diameter of the core is preferably in the range of 0.1 mm or more and 0.8 mm or less, the diameter of the abrasive grains is preferably in the range of 1 μm or more and 8 μm or less, and the pressure of the compressed air is 0.2 MPa. It is preferable to be within the range of 0.5 MPa or more. Moreover, the projection angle of the particles is preferably within the range of 45° or more and 60° or less with respect to the surface to be processed, and the processing time is preferably within the range of 30 minutes or more and 45 minutes or less.

<Characteristics of wet blasting>
The wet blasting process used for producing the surface-roughened member according to the embodiment of the present invention has the following characteristics.
(1) Fine irregularities can be formed compared to dry blasting.
(2) The uneven structure is more uniform than dry blasting.
(3) There is little risk of residual abrasive grains, and a clean surface finish can be achieved, and a cleaning step after treatment can be omitted.
(4) Compared with dry blasting, the risk of deformation of the treated surface is low, and it can be applied to thin plate materials.
(5) Less heat is generated on the surface to be treated than dry blasting, and treatment burn does not occur.
(6) Abrasive grains with different grain sizes can be mixed and used, so that the choice of abrasive grains is wider than in dry blasting, and the root-mean-square gradient Sdq can be easily improved.

<Features of the surface-roughened member according to the embodiment of the present invention>
The surface-roughened member according to the embodiment of the present invention is superior to the conventional surface-roughened member in sliding and sliding properties.

It should be noted that the reason why the surface-roughened member according to the embodiment of the present invention exhibits the above-mentioned performance is that relatively large-scale complex unevenness is formed in the first wet blasting process during fabrication, and the second This is presumed to be due to the formation of complex irregularities of a relatively small scale on the irregularities of a relatively large scale in the wet blasting process and the subsequent polishing process.

Examples and comparative examples are shown below to describe the present invention in more detail, but the present invention is not limited to these examples.

1. Surface roughening treatment of stainless steel plate A first wet blasting treatment, a second wet blasting treatment and a special polishing treatment were performed in this order on the surface to be treated (130 mm × 100 mm) of a stainless steel plate (SUS304) to roughen the surface. was used as the target rough surface structure. The stainless steel plate thus obtained is hereinafter referred to as a "test plate".

Prior to the above treatments, an abrasive dispersion was prepared for each treatment. Specifically, 1200 g of ceramic particles with a 50% average particle diameter (median diameter) of 20 μm, 600 g of ceramic particles with a 50% average particle diameter (median diameter) of 2.0 μm, and 23 L (23,000 g) of water were added. This was used as an abrasive dispersion for the first wet blasting treatment. Also, 1500 g of ceramic particles with a 50% average particle diameter (median diameter) of 2.0 μm and 200 g of ceramic particles with a 50% average particle diameter (median diameter) of 0.5 μm are added to 23 L (23,000 g) of water. It was stirred and used as an abrasive dispersion for the second wet blasting treatment.

In the first wet blasting treatment, the abrasive dispersion for the first wet blasting treatment was sprayed with 0.4 MPa compressed air onto the treated surface of the stainless steel plate (SUS304) at a projection angle of 90° for 5 minutes. In the second wet blasting treatment, the abrasive dispersion for the second wet blasting treatment was sprayed with compressed air of 0.2 MPa onto the treated surface of the stainless steel plate (SUS304) at a projection angle of 60° for 4 minutes. In the special polishing treatment, particles obtained by laminating fine diamond abrasive grains on powder rubber were slid on the treated surface of a stainless steel plate (SUS304) with compressed air of 0.2 MPa. Here, the diameter of the powder rubber was 0.1 to 0.8 mm (average diameter was 0.5 mm), and the diameter of the diamond abrasive grains was 1.0 to 8.0 μm (average The diameter was 4.0 μm.). Further, during the special polishing treatment, the projection angle of the particles was set at 45° with respect to the surface to be treated, and the treatment time was set at 9 minutes.

2. Surface analysis of treated surface (1) Measurement of arithmetic mean height Sa and root mean square gradient Sdq Based on ISO 25178, the arithmetic mean height Sa and root mean square gradient Sdq at 5 points on the treated surface of the test plate were measured. The calculated arithmetic mean height Sa was 0.182 μm. Also, the root-mean-square gradient Sdq corresponding to the median value of the arithmetic mean height Sa was 0.110 (see Table 1).

In addition, the average values of the above five parameters were as follows.
・Arithmetic mean height Sa: 0.210 μm
・Root-mean-square gradient Sdq: 0.176

(2) Measurement of surface free energy After measuring the pure contact angle with respect to the treated surface of the test plate and measuring the contact angle of diiodomethane with respect to the treated surface of the test plate, Owens and Wendt The surface free energy was determined by the model formula. The surface free energy of the treated surface of this test piece was 27.62 mJ/m ² (see Table 1).

(3) Sliding test In this test, cut cabbage, cut pineapple, soda pop, dried fish, wiener, hard candy, frozen hamburger, waffle and The sliding angle of thick fried tofu was measured. In addition, in this sliding angle measuring device, the test plate fixing plate is attached to the fixing column via the fine movement rotary stage. When the fine movement rotary stage is rotated around the axis extending in the horizontal direction, the test plate fixing plate is tilted in conjunction therewith. Further, when the temperature and relative humidity in the installation room of the slide angle measuring device were measured, the temperature was 20° C.±1° C. and the relative humidity was 58%±3%.

Specifically, this test was conducted in the following procedure.
First step: Fix the test plate to the test plate fixing plate so that the surface to be treated faces upward.
Second step: Adjust the fine-motion rotary stage so that the surface of the test plate to be processed is horizontal.
Third step: Place the food material on the surface of the test plate to be treated.
Fourth step: The fine motion rotary stage is operated to incline the test plate fixing plate by 0.1°. In addition, the interval of this angle change was set to 5 seconds.
Fifth step: The inclination angle at which the ingredients/food products slid down was recorded, and the inclination angle was taken as the slid-down angle.
In this test, the above procedure was repeated three times for the same article, and the average value was taken as the sliding angle. As a result, the results shown in Table 2 below were obtained.

1. Surface roughening treatment of stainless steel plate A first wet blasting treatment, a second wet blasting treatment and a special polishing treatment were performed in this order on the surface to be treated (130 mm × 100 mm) of a stainless steel plate (SUS304) to roughen the surface. was used as the target rough surface structure. The stainless steel plate thus obtained is hereinafter referred to as a "test plate".

Prior to the above treatments, an abrasive dispersion was prepared for each treatment. Specifically, 1500 g of ceramic particles with a 50% average particle diameter (median diameter) of 100 μm and 500 g of ceramic particles with a 50% average particle diameter (median diameter) of 20 μm are added to 23 L (23,000 g) of water and stirred. This was used as an abrasive dispersion for the first wet blasting treatment. Also, 1400 g of ceramic particles with a 50% average particle diameter (median diameter) of 2.0 μm and 300 g of ceramic particles with a 50% average particle diameter (median diameter) of 0.5 μm were added to 23 L (23,000 g) of water. It was stirred and used as an abrasive dispersion for the second wet blasting treatment.

In the first blasting treatment, the abrasive dispersion for the first wet blasting treatment was sprayed with compressed air of 0.3 MPa onto the treated surface of the stainless steel plate (SUS304) at a projection angle of 90° for 5 minutes. In the second blasting treatment, the abrasive dispersion for the second wet blasting treatment was sprayed with compressed air of 0.3 MPa onto the treated surface of the stainless steel plate (SUS304) at a projection angle of 60° for 4 minutes. In the special polishing treatment, particles obtained by laminating fine diamond abrasive grains on powder rubber were slid on the treated surface of a stainless steel plate (SUS304) with compressed air of 0.3 MPa. Here, the diameter of the powder rubber was 0.1 to 0.8 mm (average diameter was 0.5 mm), and the diameter of the diamond abrasive grains was 1.0 to 8.0 μm (average The diameter was 4.0 μm.). Further, during the special polishing treatment, the projection angle of the particles was set at 45° with respect to the surface to be treated, and the treatment time was set at 9 minutes.

2. Surface analysis of treated surface (1) Measurement of arithmetic mean height Sa and root mean square gradient Sdq Based on ISO 25178, the arithmetic mean height Sa and root mean square gradient Sdq at 5 points on the treated surface of the test plate were measured. The calculated arithmetic mean height Sa was 0.772 μm. Also, the root-mean-square gradient Sdq corresponding to the median value of the arithmetic mean height Sa was 0.325 (see Table 1).

In addition, the average values of the above five parameters were as follows.
・Arithmetic mean height Sa: 0.793 μm
・Root-mean-square gradient Sdq: 0.388

(2) Measurement of surface free energy When the surface free energy of each ingredient/food was determined in the same manner as in "(2) Measurement of surface free energy" in Example 1, the surface free energy of the treated surface of this test piece was 29.92 mJ/ ^m2 (see Table 1).

(3) Sliding test The sliding angle of each article was determined in the same manner as in "(3) Sliding test" of Example 1, and the results shown in Table 2 below were obtained.

1. Surface roughening treatment of stainless steel plate A first wet blasting treatment, a second wet blasting treatment and a special polishing treatment were performed in this order on the surface to be treated (130 mm × 100 mm) of a stainless steel plate (SUS304) to roughen the surface. was used as the target rough surface structure. The stainless steel plate thus obtained is hereinafter referred to as a "test plate".

Prior to the above treatments, an abrasive dispersion was prepared for each treatment. Specifically, 1800 g of ceramic particles with a 50% average particle size (median size) of 400 μm and 400 g of ceramic particles with a 50% average particle size (median size) of 50 μm are added to 23 L (23,000 g) of water and stirred. This was used as an abrasive dispersion for the first wet blasting treatment. Also, 1200 g of ceramic particles with a 50% average particle diameter (median diameter) of 2.0 μm and 500 g of ceramic particles with a 50% average particle diameter (median diameter) of 0.5 μm are added to 23 L (23,000 g) of water. It was stirred and used as an abrasive dispersion for the second wet blasting treatment.

In the first blasting treatment, the abrasive dispersion for the first wet blasting treatment was sprayed with compressed air of 0.3 MPa onto the treated surface of the stainless steel plate (SUS304) at a projection angle of 90° for 5 minutes. In the second blasting treatment, the abrasive dispersion for the second wet blasting treatment was sprayed with compressed air of 0.4 MPa onto the treated surface of the stainless steel plate (SUS304) at a projection angle of 60° for 4 minutes. In the special polishing treatment, particles obtained by laminating fine diamond abrasive grains on powder rubber were slid on the treated surface of a stainless steel plate (SUS304) with compressed air of 0.3 MPa. Here, the diameter of the powder rubber was 0.1 to 0.8 mm (average diameter was 0.5 mm), and the diameter of the diamond abrasive grains was 1.0 to 8.0 μm (average The diameter was 4.0 μm.). Further, during the special polishing treatment, the projection angle of the particles was set at 45° with respect to the surface to be treated, and the treatment time was set at 9 minutes.

2. Surface analysis of treated surface (1) Measurement of arithmetic mean height Sa and root mean square gradient Sdq Based on ISO 25178, the arithmetic mean height Sa and root mean square gradient Sdq at 5 points on the treated surface of the test plate were measured. The calculated arithmetic mean height Sa was 1.320 μm. Also, the root-mean-square gradient Sdq corresponding to the median value of the arithmetic mean height Sa was 0.524 (see Table 1).

In addition, the average values of the above five parameters were as follows.
・Arithmetic mean height Sa: 1.365 μm
・Root-mean-square gradient Sdq: 0.569

(2) Measurement of surface free energy When the surface free energy of each ingredient/food was determined in the same manner as in "(2) Measurement of surface free energy" in Example 1, the surface free energy of the treated surface of this test piece was 29.67 mJ/ ^m2 (see Table 1).

(3) Sliding test The sliding angle of each article was determined in the same manner as in "(3) Sliding test" of Example 1, and the results shown in Table 2 below were obtained.

(Comparative example 1)
1. Polishing Treatment of Stainless Steel Plate A surface (130 mm×100 mm) of a stainless steel plate (SUS304) was buffed with #400 to give the surface to be treated a rough surface structure. The stainless steel plate thus obtained is hereinafter referred to as a "test plate".

2. Surface analysis of treated surface (1) Measurement of arithmetic mean height Sa and root mean square gradient Sdq Based on ISO 25178, the arithmetic mean height Sa and root mean square gradient Sdq at 5 points on the treated surface of the test plate were measured. The calculated arithmetic mean height Sa was 0.020 μm. Also, the root-mean-square gradient Sdq corresponding to the median value of the arithmetic mean height Sa was 0.011 (see Table 1).

In addition, the average values of the above five parameters were as follows.
・Arithmetic mean height Sa: 0.021 μm
・Root-mean-square gradient Sdq: 0.021

(2) Measurement of surface free energy When the surface free energy of each ingredient/food was determined in the same manner as in "(2) Measurement of surface free energy" in Example 1, the surface free energy of the treated surface of this test piece was 51.43 mJ/ ^m2 (see Table 1).

(3) Sliding test The sliding angle of each article was determined in the same manner as in "(3) Sliding test" of Example 1, and the results shown in Table 2 below were obtained.

(Comparative example 2)
1. Polishing Treatment of Stainless Steel Plate The surface to be treated (130 mm×100 mm) of a stainless steel plate (SUS304) was electropolished to give the surface to be treated a rough surface structure. The stainless steel plate thus obtained is hereinafter referred to as a "test plate".

2. Surface analysis of treated surface (1) Measurement of arithmetic mean height Sa and root mean square gradient Sdq Based on ISO 25178, the arithmetic mean height Sa and root mean square gradient Sdq at 5 points on the treated surface of the test plate were measured. The calculated arithmetic mean height Sa was 0.237 μm. Also, the root-mean-square gradient Sdq corresponding to the median value of the arithmetic mean height Sa was 0.024 (see Table 1).

In addition, the average values of the above five parameters were as follows.
・Arithmetic mean height Sa: 0.241 μm
・Root-mean-square gradient Sdq: 0.022

(2) Measurement of surface free energy When the surface free energy of each ingredient/food was determined in the same manner as in "(2) Measurement of surface free energy" in Example 1, the surface free energy of the treated surface of this test piece was 43.11 mJ/ ^m2 (see Table 1).

(3) Sliding test The sliding angle of each article was determined in the same manner as in "(3) Sliding test" of Example 1, and the results shown in Table 2 below were obtained.

[Comparative Verification of Sliding Angles of Test Plates Produced in Examples and Comparative Examples]
As is clear from Table 2, the test plates according to any of the examples exhibited lower sliding angles than the test plates according to any of the comparative examples. This indicates that the test plate according to the example is superior to the test plate according to the comparative example in sliding and sliding properties. In addition, the test plate according to Example 1 exhibited superior gliding properties and sliding properties, particularly for cut cabbage, cut pineapple, and soda pop, compared to the test plates according to Comparative Examples 1 and 2 (Table 2 and Fig. 1 reference). In addition, the test plate according to Example 2 exhibited better gliding and sliding properties than the test plates according to Comparative Examples 1 and 2, especially for dried fish, wieners, and hard candy (Table 2 and Fig. 2 reference). In addition, the test plate according to Example 3, especially for frozen hamburgers, waffles, and deep-fried tofu, showed better sliding properties and sliding properties than the test plates according to Comparative Examples 1 and 2 (Table 3 and Figure 2).

The present invention relates to a member surface roughening method and a conveying path forming member conveying surface roughening method . The present invention also relates to a member having a roughened surface and a conveying path forming member for an article .

2. Description of the Related Art An apparatus or the like having an article conveying mechanism is generally provided with a conveying path forming member such as a shooter or a guide that constitutes a conveying path of an article. The conveying path forming member is required to have high slidability and slideability from the viewpoint of improving the article conveying processing speed. In order to impart such physical properties to the transport path forming member, the transport path forming member may be subjected to buffing treatment or electrolytic polishing treatment (the applicant believes that such a technique is I know that it is well known in the field, but I am unaware of the existence of any document disclosing this fact.)

By the way, in recent years, there has been a demand for a further improvement in the transportation processing speed of articles. SUMMARY OF THE INVENTION An object of the present invention is to provide a transport path forming member capable of further improving the transport processing speed of an article.

In the method for roughening a member according to the first aspect of the present invention, the member is subjected to wet blasting multiple times under different conditions and then to polishing, and the arithmetic mean height Sa is 0.50 μm. 1.00 μm or less, the root mean square gradient Sdq is more than 0.30 and 0.50 or less, and the surface free energy is 25 mJ/m 2 or more and ³⁵ mJ/m ² or less. A rough surface is formed. Note that the arithmetic mean height Sa and the root mean square gradient Sdq are defined in ISO 25178. The surface free energy is calculated from the contact angle of pure water and the contact angle of diiodomethane by the Owens and Wendt model formula.

As a result of intensive studies by the inventors of the present application, it was found that by using this surface roughening method for a member, particularly dried fish, wieners, and hard candy can achieve higher glide properties and smoothness than members subjected to buffing or electropolishing. It has become clear that a metal component member having sliding properties can be produced. Therefore, by implementing this member surface roughening method, it is possible to realize a further improvement in the transportation processing speed of articles (especially foods, foods, etc., that contain relatively abundant moisture, oil, etc.). A passage forming member can be manufactured.

In the method for roughening a member according to the second aspect of the present invention, the member is subjected to wet blasting multiple times under different conditions and then to polishing, and the arithmetic mean height Sa is 1.00 μm. 2.00 μm or less, the root mean square gradient Sdq is 0.50 or more and 0.70 or less, and the surface free energy is 25 mJ / m ² 35 mJ/m or more ² A rough surface is formed that is within the following range. Note that the arithmetic mean height Sa and the root mean square gradient Sdq are defined in ISO 25178. The surface free energy is calculated from the contact angle of pure water and the contact angle of diiodomethane by the Owens and Wendt model formula.

As a result of intensive studies by the inventors of the present application, by using this surface roughening method for a member, particularly for frozen hamburgers, waffles, and deep-fried tofu, it is possible to achieve higher glide than members subjected to buffing treatment or electrolytic polishing treatment. It has become clear that it is possible to fabricate a metal component that has flexibility and sliding properties. Therefore, by implementing this member surface roughening method, it is possible to realize a further improvement in the transportation processing speed of articles (especially foods, foods, etc., that contain relatively abundant moisture, oil, etc.). A passage forming member can be manufactured.

A member surface roughening method according to a third aspect of the present invention includes a first wet blasting process, a second wet blasting process, and a polishing process. The terms "first" and "second" used here are used only to indicate relative differences, and are used to indicate absolute order. (i.e., if the wet blasting process is performed three or more times, the first wet blasting process and the second wet blasting process referred to herein are the first two wet blasting processes. means the last two wet blasting steps.). In the first wet blasting step, the member is wet blasted under a first condition to produce a member having a first rough surface. In addition, before the first wet blasting process, the member may be subjected to one or more wet blasting processes. In the second wet blasting step, the member having the first rough surface is wet blasted under a second condition to produce a member having the second rough surface. Note that the second condition is different from the first condition here. In the polishing step, the member having the second rough surface is subjected to polishing processing to produce a member having the third rough surface. Here, the third rough surface has an arithmetic mean height Sa within a range of 0.50 μm or more and 1.00 μm or less, and a root mean square gradient Sdq within a range of more than 0.30 and 0.50 or less. , the surface free energy is in the range of 25 mJ/m ² or more and 35 mJ/m ² or less. Also, the arithmetic mean height Sa and the root mean square gradient Sdq are specified in ISO 25178. The surface free energy is calculated from the contact angle of pure water and the contact angle of diiodomethane by the Owens and Wendt model formula.

As a result of intensive studies by the inventors of the present application, it was found that by using this surface roughening method for a member, particularly dried fish, wieners, and hard candy can achieve higher glide properties and smoothness than members subjected to buffing or electropolishing. It has become clear that a member having sliding properties can be produced. Therefore, by implementing this member surface roughening method, it is possible to realize a further improvement in the transportation processing speed of articles (especially foods, foods, etc., that contain relatively abundant moisture, oil, etc.). A passage forming member can be manufactured.

A member surface roughening method according to a fourth aspect of the present invention includes a first wet blasting process, a second wet blasting process, and a polishing process. The terms "first" and "second" used here are used only to indicate relative differences, and are used to indicate absolute order. (i.e., if the wet blasting process is performed three or more times, the first wet blasting process and the second wet blasting process referred to herein are the first two wet blasting processes. means the last two wet blasting steps.). In the first wet blasting step, the member is wet blasted under a first condition to produce a member having a first rough surface. In addition, before the first wet blasting process, the member may be subjected to one or more wet blasting processes. In the second wet blasting step, the member having the first rough surface is wet blasted under a second condition to produce a member having the second rough surface. Note that the second condition is different from the first condition here. In the polishing step, the member having the second rough surface is subjected to polishing processing to produce a member having the third rough surface. Here, the third rough surface has an arithmetic mean height Sa within the range of 1.00 μm or more and 2.00 μm or less, and a root mean square gradient Sdq within the range of 0.50 or more and 0.70 or less. , the surface free energy is 25 mJ/m ² 35 mJ/m or more ² Within the following range. Also, the arithmetic mean height Sa and the root mean square gradient Sdq are specified in ISO 25178. The surface free energy is calculated from the contact angle of pure water and the contact angle of diiodomethane by the Owens and Wendt model formula.

As a result of intensive studies by the inventors of the present application, by using this surface roughening method for a member, particularly for frozen hamburgers, waffles, and deep-fried tofu, it is possible to achieve higher glide than members subjected to buffing treatment or electrolytic polishing treatment. It has become clear that a member can be produced that has flexibility and sliding properties. Therefore, by implementing this member surface roughening method, it is possible to realize a further improvement in the transportation processing speed of articles (especially foods, foods, etc., that contain relatively abundant moisture, oil, etc.). A passage forming member can be manufactured.

A member surface roughening method according to a fifth aspect of the present invention is the member surface roughening method according to the third aspect or the fourth aspect, wherein in the second wet blasting step, a Large abrasive grains having an average particle diameter within the following range and small abrasive grains having an average particle diameter within the range of 0.1 μm or more and 1.0 μm or less are used as abrasive grains.

A member surface roughening method according to a sixth aspect of the present invention is a member surface roughening method according to any one of the first to fifth aspects, wherein the member is an article (however, powdery (excluding articles) is a conveying path forming member.

In the member according to the seventh aspect of the present invention, the arithmetic mean height Sa is in the range of 0.50 μm or more and 1.00 μm or less, and the root mean square gradient Sdq is in the range of more than 0.30 and 0.50 or less. , has a rough surface with a surface free energy in the range of 25 mJ/m ² or more and 35 mJ/m ² or less.

As a result of intensive studies by the inventors of the present application, the member having the above-mentioned rough surface, especially for dried fish, wiener sausages, and hard candy, has higher sliding properties and slipping properties than members subjected to buffing or electropolishing. It was made clear. Therefore, by using this member as a conveying path forming member, it is possible to realize a further improvement in the conveying processing speed of articles (particularly those containing relatively abundant water, oil, and the like, such as foodstuffs and foodstuffs).

The member according to the eighth aspect of the present invention has an arithmetic mean height Sa within the range of 1.00 μm or more and 2.00 μm or less, and a root mean square gradient Sdq within the range of 0.50 or more and 0.70 or less. , has a rough surface with a surface free energy in the range of 25 mJ/m ² or more and 35 mJ/m ² or less.

As a result of intensive studies by the inventors of the present application, the member having the rough surface has higher sliding property and sliding property than members subjected to buffing treatment or electrolytic polishing treatment, especially for frozen hamburgers, waffles, and deep-fried tofu. It was found to have Therefore, by using this member as a conveying path forming member, it is possible to realize a further improvement in the conveying processing speed of articles (particularly those containing relatively abundant water, oil, and the like, such as foodstuffs and foodstuffs).

The member according to the ninth aspect of the present invention is the member according to the seventh aspect or the eighth aspect, which is a transport path forming member for articles (excluding powdery articles). Also, the rough surface is the conveying surface of the article.

A member according to a tenth aspect of the present invention is a member according to any one of the seventh to ninth aspects, wherein the rough surface is wet blasted multiple times under different conditions and then polished. is applied and formed.

In the method for roughening the conveying surface of the conveying path forming member according to the eleventh aspect of the present invention, the conveying surface of the conveying path forming member for articles (excluding powdery articles) is roughened a plurality of times under different conditions. Polishing treatment is performed after wet blasting treatment, and the arithmetic mean height Sa is in the range of 0.10 μm or more and 2.00 μm or less, and the root mean square gradient Sdq is 0.10 or more and 0.70 or less. and the surface free energy is 40 mJ / m ² A rough surface is formed that is: Note that the arithmetic mean height Sa and the root mean square gradient Sdq are defined in ISO 25178. The surface free energy is calculated from the contact angle of pure water and the contact angle of diiodomethane by the Owens and Wendt model formula.

As a result of intensive studies by the inventors of the present application, it was found that by using this method of roughening a member, a metal component having higher sliding properties and sliding properties than members subjected to buffing and electrolytic polishing can be produced. It became clear that it is possible. Therefore, by implementing this member surface roughening method, it is possible to realize a further improvement in the transportation processing speed of articles (especially foods, foods, etc., that contain relatively abundant moisture, oil, etc.). A passage forming member can be manufactured.

A method for roughening a conveying surface of a conveying path forming member according to a twelfth aspect of the present invention includes a first wet blasting process, a second wet blasting process, and a polishing process. The terms "first" and "second" used here are used only to indicate relative differences, and are used to indicate absolute order. (i.e., if the wet blasting process is performed three or more times, the first wet blasting process and the second wet blasting process referred to herein are the first two wet blasting processes. means the last two wet blasting steps.). In the first wet blasting step, the conveying surface of the conveying path forming member for the articles (excluding powdery articles) is wet blasted under a first condition to produce articles having a first rough surface. A transport path forming member is produced. Before the first wet blasting step, even if the conveying surface of the conveying path forming member for the articles (excluding powdery articles) is subjected to one or more wet blasting steps. I don't mind. In the second wet blasting step, the first rough surface is subjected to wet blasting under a second condition to produce an article transport path forming member having the second rough surface. Note that the second condition is different from the first condition here. In the polishing step, the second rough surface is subjected to a polishing process to produce a transport path forming member for an article having a third rough surface. Here, the third rough surface has an arithmetic mean height Sa within the range of 0.10 μm or more and 2.00 μm or less, and a root mean square gradient Sdq within the range of 0.10 or more and 0.70 or less. Yes, and the surface free energy is 40 mJ / m ² It is below. Also, the arithmetic mean height Sa and the root mean square gradient Sdq are specified in ISO 25178. The surface free energy is calculated from the contact angle of pure water and the contact angle of diiodomethane by the Owens and Wendt model formula.

As a result of intensive studies by the inventors of the present application, it has been found that by using this method of roughening a member, it is possible to produce a member having higher sliding properties and sliding properties than members subjected to buffing or electropolishing. It became clear that it was possible. Therefore, by implementing this member surface roughening method, it is possible to realize a further improvement in the transportation processing speed of articles (especially foods, foods, etc., that contain relatively abundant moisture, oil, etc.). A passage forming member can be manufactured.

A member surface roughening method according to a thirteenth aspect of the present invention is the member surface roughening method according to the twelfth aspect, wherein in the second wet blasting step, the and small abrasive grains having an average grain diameter in the range of 0.1 μm to 1.0 μm.

The conveying path forming member for the articles (excluding powdery articles) according to the fourteenth aspect of the present invention has an arithmetic mean height Sa within the range of 0.10 μm or more and 2.00 μm or less, and the root mean square It has a rough surface with a gradient Sdq in the range of 0.10 or more and 0.70 or less and a surface free energy of 40 mJ/m ² or less as a conveying surface .

As a result of intensive studies by the inventors, it has become clear that the member having the above-described rough surface has higher sliding properties and slipping properties than members subjected to buffing treatment or electropolishing treatment. Therefore, by using this member as a conveying path forming member, it is possible to realize a further improvement in the conveying processing speed of articles (particularly those containing relatively abundant water, oil, and the like, such as foodstuffs and foodstuffs).

The member according to the fifteenth aspect of the present invention has an arithmetic mean height Sa within the range of 0.10 μm or more and 2.00 μm or less, and a root mean square gradient Sdq within the range of 0.10 or more and 0.70 or less Yes, and the surface free energy is 40 mJ / m ² It has a rough surface that is: Further, the rough surface is formed by performing wet blasting multiple times under different conditions and then performing polishing.

As a result of intensive studies by the inventors, it has become clear that the member having the above-described rough surface has higher sliding properties and slipping properties than members subjected to buffing treatment or electropolishing treatment. Therefore, by using this member as a conveying path forming member, it is possible to realize a further improvement in the conveying processing speed of articles (particularly those containing relatively abundant water, oil, and the like, such as foodstuffs and foodstuffs).

The member according to the sixteenth aspect of the present invention has an arithmetic mean height Sa within the range of 0.10 μm or more and 2.00 μm or less, and a root mean square gradient Sdq within the range of 0.10 or more and 0.70 or less Yes, and the surface free energy is 40 mJ / m ² It has a rough surface that is: Further, the rough surface is formed by performing a first wet blasting treatment under a first condition, performing a second wet blasting treatment under a second condition different from the first condition, and then performing a polishing treatment. ing.

As a result of intensive studies by the inventors, it has become clear that the member having the above-described rough surface has higher sliding properties and slipping properties than members subjected to buffing treatment or electropolishing treatment. Therefore, by using this member as a conveying path forming member, it is possible to realize a further improvement in the conveying processing speed of articles (particularly those containing relatively abundant water, oil, and the like, such as foodstuffs and foodstuffs).

The member according to the seventeenth aspect of the present invention is the member according to the sixteenth aspect, wherein in the second wet blasting treatment, large abrasive grains having an average particle diameter within the range of 1.5 μm or more and 2.5 μm or less; Small abrasive grains having an average particle diameter within the range of 0.1 μm or more and 1.0 μm or less are used as abrasive grains.

Bar graphs comparing the sliding angles of cut vegetables (cut cabbage, etc.), cut fruits (cut pineapple), and tablet-shaped sweets (ramune) on the treated surfaces of the test plates of Example 1, Comparative Example 1, and Comparative Example 2. be. FIG. 10 is a bar graph comparing the sliding angles of dried fish, wieners, and hard candy with respect to the surfaces to be treated of the test plates of Example 2, Comparative Example 1, and Comparative Example 2; 2 is a bar graph comparing the sliding angles of frozen hamburgers, waffles, and deep-fried tofu with respect to the surfaces to be treated of the test plates of Example 3, Comparative Examples 1 and 2. FIG.

<Roughened member according to the embodiment of the present invention>
The surface-roughened member according to the embodiment of the present invention is, for example, a food manufacturing/processing device having a transport line for transporting foodstuffs and processed foods (e.g., weighing machines, filling machines, packaging machines, transporting/discharging machines, etc.). ) hoppers, shooters, chutes, buckets, slicers, guides, belts, rolls, and the like. In addition, this surface-roughening member may be formed of metal or resin. Examples of such metals include stainless steel (eg, SUS304, SUS316, etc.), aluminum alloys, SS materials (eg, SS400, etc.), and the like. In this roughened member, the arithmetic mean height Sa is within the range of 0.10 μm or more and 2.00 μm or less, and the root mean square gradient Sdq is within the range of 0.10 or more and 0.70 or less, A rough surface having a surface free energy of 40 mJ/m ² or less is defined as a sliding surface or a sliding surface.

Note that the arithmetic mean height Sa, the root mean square gradient Sdq and the surface free energy cannot be adjusted independently. Although the parameters of the rough surface according to representative examples of which the effects have been confirmed at present are as follows, the present invention is not limited to these representative examples.

(Representative example 1)
Arithmetic mean height Sa: 0.10 μm or more and 0.30 μm or less Root mean square gradient Sdq: 0.10 or more and 0.30 or less Surface free energy: 20 mJ/m ² or more and 30 mJ/m ² or less In addition, such a rough surface is particularly effective in improving the gliding and sliding properties of cut vegetables (cut cabbage, etc.), cut fruits (cut pineapple), and tablet-type confectionery (ramune).

(Representative example 2)
Arithmetic mean height Sa: within the range of 0.50 μm or more and 1.00 μm or less Root mean square gradient Sdq: within the range of 0.30 or more and 0.50 or less Surface free energy: 25 mJ/m ² or more and 35 mJ/m ² or less In addition, such a rough surface is particularly effective in improving the gliding and sliding properties of dried fish, wieners, and hard candy.

(Representative example 3)
Arithmetic mean height Sa: within the range of 1.00 μm or more and 2.00 μm or less Root mean square gradient Sdq: within the range of 0.50 or more and 0.70 or less Surface free energy: 25 mJ/m ² or more and 35 mJ/m ² or less In addition, such a rough surface is particularly effective in improving the gliding and sliding properties of frozen hamburgers, waffles, and deep-fried tofu.

<Method for producing surface-roughened member according to embodiment of the present invention>
By the way, the roughened member according to the embodiment of the present invention is manufactured through a first wet blasting process, a second wet blasting process and a polishing process. In addition, if necessary, a pretreatment step may be performed before the first wet blasting step. These steps are described in detail below.

(1) First wet blasting step In the first wet blasting step, the member is subjected to wet blasting under a first condition to produce a member having a first rough surface.

Items of the first condition include, for example, the shape and structure of the abrasive grains, the material of the abrasive grains, the average particle size (50% particle size) of the abrasive grains, the type of the dispersion medium, the ratio of the abrasive grains to the dispersion medium, and the abrasive grains. The ejection pressure of the dispersion, the ejection angle of the abrasive dispersion, the distance from the abrasive dispersion injection nozzle to the surface to be treated, the treatment time, and the like can be mentioned.

The shape of the abrasive grains is preferably polygonal or spherical. The structure of the abrasive grains is preferably a single layer structure. The material of the abrasive grains is preferably ceramic. The dispersion medium is preferably water. It is preferable to disperse two or more types of abrasive grains having different average particle sizes in the dispersion medium. When two types of abrasive grains with different average particle sizes are dispersed in the dispersion medium, the abrasive grains with the larger average particle size should be contained within the range of 4.5 g or more and 8.5 g or less per 100 g of the dispersion medium. is preferably contained within the range of 5.0 g or more and 8.0 g or less, and the abrasive grains having a small average particle size are contained within the range of 1.0 g or more and 3.5 g or less per 100 g of the dispersion medium. is preferably contained within the range of 1.5 g or more and 3.0 g or less. The discharge pressure of the abrasive dispersion is preferably in the range of 0.2 MPa or more and 0.5 MPa or less. The ejection angle of the abrasive dispersion liquid is preferably in the range of 60° or more and 90° or less with respect to the surface to be treated. It is preferable that the distance from the abrasive grain dispersion injection nozzle to the surface to be treated is in the range of 50 mm or more and 200 mm or less. The treatment time is preferably 5 minutes or more when treating an area of 300 mm×300 mm, for example.

In order to form a rough surface having the parameters of Representative Example 1 above, abrasive grains having an average particle diameter within the range of 15 μm or more and 25 μm or less (hereinafter sometimes referred to as “large abrasive grains”) and 1 μm or more and 3 μm It is preferable to disperse abrasive grains (hereinafter sometimes referred to as "small abrasive grains") having an average particle size within the following range in a dispersion medium. In such a case, it is preferable that the large abrasive grains are contained in the dispersion medium within the range of 4.5 g or more and 5.5 g or less per 100 g of the dispersion medium, and the small abrasive grains are contained in the dispersion medium of 2.0 g or more per 100 g of the dispersion medium. It is preferably contained in the dispersion medium within the range of 3.0 g or less.

In order to form a roughened surface having the parameters of Representative Example 2 above, abrasive grains having an average particle diameter within the range of 95 μm or more and 105 μm or less (hereinafter sometimes referred to as “large abrasive grains”) and 15 μm or more and 25 μm It is preferable to disperse abrasive grains (hereinafter sometimes referred to as "small abrasive grains") having an average particle size within the following range in a dispersion medium. In such a case, it is preferable that the dispersion medium contains 6.0 g or more and 7.0 g or less of the large abrasive grains per 100 g of the dispersion medium, and the small abrasive grains of 1.5 g or more per 100 g of the dispersion medium. It is preferably contained in the dispersion medium within the range of 2.5 g or less.

Further, in order to form a rough surface having the parameters of Representative Example 3 above, abrasive grains having an average particle diameter within the range of 395 μm or more and 405 μm or less (hereinafter sometimes referred to as “large abrasive grains”) and 45 μm or more and 55 μm It is preferable to disperse abrasive grains (hereinafter sometimes referred to as "small abrasive grains") having an average particle size within the following range in a dispersion medium. In such a case, it is preferable that the dispersion medium contains 7.5 to 8.5 g of large abrasive grains per 100 g of dispersion medium, and 1.0 g or more of small abrasive grains per 100 g of dispersion medium. It is preferably contained in the dispersion medium within the range of 2.0 g or less.

(2) Second wet blasting process In the second wet blasting process, the member having the first rough surface is subjected to wet blasting under the second condition to produce a member having the second rough surface. .

The items of the second condition are the same as the items of the first condition, and include, for example, the shape and structure of the abrasive grains, the material of the abrasive grains, the average particle size of the abrasive grains (50% particle size), the type of dispersion medium, These include the ratio of abrasive grains to the dispersion medium, the discharge pressure of the abrasive grain dispersion liquid, the discharge angle of the abrasive grain dispersion liquid, the processing time, and the like.

The shape of the abrasive grains is preferably polygonal or spherical. The structure of the abrasive grains is preferably a single layer structure. The material of the abrasive grains is preferably ceramic. The average particle size of the abrasive grains used here is smaller than the average particle size of the abrasive grains used in the first wet blasting step. The dispersion medium is preferably water. It is preferable to disperse two or more types of abrasive grains having different average particle sizes in the dispersion medium. When two types of abrasive grains having different average particle diameters are dispersed in the dispersion medium, the abrasive grains having the larger average particle diameter should be contained within the range of 5.5 g or more and 7.5 g or less per 100 g of the dispersion medium. is preferably contained within the range of 6.0 g or more and 7.0 g or less, and the abrasive grains having a small average particle size are contained within the range of 0.1 g or more and 2.0 g or less per 100 g of the dispersion medium. is preferably contained within the range of 0.5 g or more and 1.5 g or less. The discharge pressure of the abrasive dispersion is preferably in the range of 0.1 MPa or more and 0.3 MPa or less. The ejection angle of the abrasive dispersion liquid is preferably within the range of 30° or more and 60° or less with respect to the surface to be treated. It is preferable that the distance from the abrasive grain dispersion injection nozzle to the surface to be treated is in the range of 50 mm or more and 300 mm or less. The treatment time is preferably 4 minutes or more when treating an area of 300 mm×300 mm, for example.

Further, in order to form a rough surface having the parameters of representative examples 1 to 3, abrasive grains having an average particle diameter within the range of 1.5 μm or more and 2.5 μm or less (hereinafter sometimes referred to as “large abrasive grains”) ) and abrasive grains having an average particle diameter within the range of 0.1 μm or more and 1.0 μm or less (hereinafter sometimes referred to as “small abrasive grains”) are preferably dispersed in a dispersion medium. In such a case, the large abrasive grains are preferably contained in the dispersion medium in an amount of 5.0 g or more and 7.0 g or less per 100 g of the dispersion medium, and the small abrasive grains are preferably contained in 0.5 g or more per 100 g of the dispersion medium. It is preferably contained in the dispersion medium within the range of 2.5 g or less.

(3) Polishing process In the polishing process, the member having the second rough surface is subjected to a polishing process to produce a member having the third rough surface. In this polishing treatment step, various polishing treatments may be performed as long as the gist of the present invention is not compromised, but special polishing treatment is preferably performed.

In the special polishing treatment, particles in which fine abrasive grains are layered on an elastic core material such as resin or rubber are slid on the second rough surface by compressed air or centrifugal force. Here, the particles are preferably particles in which a resin core is coated with abrasive grains. The diameter of the core is preferably in the range of 0.1 mm or more and 0.8 mm or less, and the diameter of the abrasive grains is preferably in the range of 1.0 μm or more and 8.0 μm or less. is preferably in the range of 0.1 MPa or more and 0.5 MPa or less. In addition, the projection angle of the particles is preferably in the range of 30° or more and 60° or less with respect to the surface to be treated, and the treatment time is, for example, 9 minutes or more when treating an area of 300 mm × 300 mm. preferable.

In this polishing step, the arithmetic mean height Sa is in the range of 0.10 μm or more and 2.00 μm or less, the root mean square gradient Sdq is in the range of 0.10 or more and 0.70 or less, and , the surface to be treated is roughened so that the surface free energy is 40 mJ/m ² or less.

(4) Pretreatment step The pretreatment step is preferably performed when the arithmetic mean height Sa of the surface to be treated of the member is 1.0 μm or more. This is to obtain a surface with a desired degree of roughness in the second wet blasting process and polishing process, which are subsequent steps. Examples of the pretreatment include polishing treatment such as special polishing. In the special polishing process, particles made by laminating fine abrasive grains on an elastic core material such as resin or rubber are slid on the surface to be treated by compressed air or centrifugal force, and unevenness is formed by cutting, polishing, etc. Scratches are removed and surface roughness is reduced. Here, the particles are preferably particles in which a resin core is coated with abrasive grains. The diameter of the core is preferably in the range of 0.1 mm or more and 0.8 mm or less, the diameter of the abrasive grains is preferably in the range of 1 μm or more and 8 μm or less, and the pressure of the compressed air is 0.2 MPa. It is preferable to be within the range of 0.5 MPa or more. Moreover, the projection angle of the particles is preferably within the range of 45° or more and 60° or less with respect to the surface to be processed, and the processing time is preferably within the range of 30 minutes or more and 45 minutes or less.

<Characteristics of wet blasting>
The wet blasting process used for producing the surface-roughened member according to the embodiment of the present invention has the following features.
(1) Fine irregularities can be formed compared to dry blasting.
(2) The uneven structure is more uniform than dry blasting.
(3) There is little risk of residual abrasive grains, and a clean surface finish can be achieved, and a cleaning step after treatment can be omitted.
(4) Compared with dry blasting, the risk of deformation of the treated surface is low, and it can be applied to thin plate materials.
(5) Less heat is generated on the surface to be treated than dry blasting, and treatment burn does not occur.
(6) Abrasive grains with different grain sizes can be mixed and used, so that the choice of abrasive grains is wider than in dry blasting, and the root-mean-square gradient Sdq can be easily improved.

<Features of the surface-roughened member according to the embodiment of the present invention>
The surface-roughened member according to the embodiment of the present invention is superior to the conventional surface-roughened member in sliding and sliding properties.

It should be noted that the reason why the surface-roughened member according to the embodiment of the present invention exhibits the above-mentioned performance is that relatively large-scale complex unevenness is formed in the first wet blasting process during fabrication, and the second This is presumed to be due to the formation of complex irregularities of a relatively small scale on the irregularities of a relatively large scale in the wet blasting process and the subsequent polishing process.

Examples and comparative examples are shown below to describe the present invention in more detail, but the present invention is not limited to these examples.

1. Surface roughening treatment of stainless steel plate A first wet blasting treatment, a second wet blasting treatment and a special polishing treatment were performed in this order on the surface to be treated (130 mm × 100 mm) of a stainless steel plate (SUS304) to roughen the surface. was used as the target rough surface structure. The stainless steel plate thus obtained is hereinafter referred to as a "test plate".

Prior to the above treatments, an abrasive dispersion was prepared for each treatment. Specifically, 1200 g of ceramic particles with a 50% average particle diameter (median diameter) of 20 μm, 600 g of ceramic particles with a 50% average particle diameter (median diameter) of 2.0 μm, and 23 L (23,000 g) of water were added. This was used as an abrasive dispersion for the first wet blasting treatment. Also, 1500 g of ceramic particles with a 50% average particle diameter (median diameter) of 2.0 μm and 200 g of ceramic particles with a 50% average particle diameter (median diameter) of 0.5 μm are added to 23 L (23,000 g) of water. It was stirred and used as an abrasive dispersion for the second wet blasting treatment.

In the first wet blasting treatment, the abrasive dispersion for the first wet blasting treatment was sprayed with 0.4 MPa compressed air onto the treated surface of the stainless steel plate (SUS304) at a projection angle of 90° for 5 minutes. In the second wet blasting treatment, the abrasive dispersion for the second wet blasting treatment was sprayed with compressed air of 0.2 MPa onto the treated surface of the stainless steel plate (SUS304) at a projection angle of 60° for 4 minutes. In the special polishing treatment, particles obtained by laminating fine diamond abrasive grains on powder rubber were slid on the treated surface of a stainless steel plate (SUS304) with compressed air of 0.2 MPa. Here, the diameter of the powder rubber was 0.1 to 0.8 mm (average diameter was 0.5 mm), and the diameter of the diamond abrasive grains was 1.0 to 8.0 μm (average The diameter was 4.0 μm.). Further, during the special polishing treatment, the projection angle of the particles was set at 45° with respect to the surface to be treated, and the treatment time was set at 9 minutes.

2. Surface analysis of treated surface (1) Measurement of arithmetic mean height Sa and root mean square gradient Sdq Based on ISO 25178, the arithmetic mean height Sa and root mean square gradient Sdq at 5 points on the treated surface of the test plate were measured. The calculated arithmetic mean height Sa was 0.182 μm. Also, the root-mean-square gradient Sdq corresponding to the median value of the arithmetic mean height Sa was 0.110 (see Table 1).

In addition, the average values of the above five parameters were as follows.
・Arithmetic mean height Sa: 0.210 μm
・Root-mean-square gradient Sdq: 0.176

(2) Measurement of surface free energy After measuring the contact angle of pure water with respect to the treated surface of the test plate and the contact angle of diiodomethane with respect to the treated surface of the test plate, Owens and Owens et al. The surface free energy was determined by the Wendt model formula. The surface free energy of the treated surface of this test plate was 27.62 mJ/m ² (see Table 1).

(3) Sliding test In this test, cut cabbage, cut pineapple, soda pop, dried fish, wiener, hard candy, frozen hamburger, waffle and The sliding angle of thick fried tofu was measured. In addition, in this sliding angle measuring device, the test plate fixing plate is attached to the fixing column via the fine movement rotary stage. When the fine movement rotary stage is rotated around the axis extending in the horizontal direction, the test plate fixing plate is tilted in conjunction therewith. Further, when the temperature and relative humidity in the installation room of the slide angle measuring device were measured, the temperature was 20° C.±1° C. and the relative humidity was 58%±3%.

Specifically, this test was conducted in the following procedure.
First step: Fix the test plate to the test plate fixing plate so that the surface to be treated faces upward.
Second step: Adjust the fine-motion rotary stage so that the surface of the test plate to be processed is horizontal.
Third step: Place the food material on the surface of the test plate to be treated.
Fourth step: The fine motion rotary stage is operated to incline the test plate fixing plate by 0.1°. In addition, the interval of this angle change was set to 5 seconds.
Fifth step: The inclination angle at which the ingredients/food products slid down was recorded, and the inclination angle was taken as the slid-down angle.
In this test, the above procedure was repeated three times for the same article, and the average value was taken as the sliding angle. As a result, the results shown in Table 2 below were obtained.

1. Surface roughening treatment of stainless steel plate A first wet blasting treatment, a second wet blasting treatment and a special polishing treatment were performed in this order on the surface to be treated (130 mm × 100 mm) of a stainless steel plate (SUS304) to roughen the surface. was used as the target rough surface structure. The stainless steel plate thus obtained is hereinafter referred to as a "test plate".

Prior to the above treatments, an abrasive dispersion was prepared for each treatment. Specifically, 1500 g of ceramic particles with a 50% average particle diameter (median diameter) of 100 μm and 500 g of ceramic particles with a 50% average particle diameter (median diameter) of 20 μm are added to 23 L (23,000 g) of water and stirred. This was used as an abrasive dispersion for the first wet blasting treatment. Also, 1400 g of ceramic particles with a 50% average particle diameter (median diameter) of 2.0 μm and 300 g of ceramic particles with a 50% average particle diameter (median diameter) of 0.5 μm were added to 23 L (23,000 g) of water. It was stirred and used as an abrasive dispersion for the second wet blasting treatment.

In the first blasting treatment, the abrasive dispersion for the first wet blasting treatment was sprayed with compressed air of 0.3 MPa onto the treated surface of the stainless steel plate (SUS304) at a projection angle of 90° for 5 minutes. In the second blasting treatment, the abrasive dispersion for the second wet blasting treatment was sprayed with compressed air of 0.3 MPa onto the treated surface of the stainless steel plate (SUS304) at a projection angle of 60° for 4 minutes. In the special polishing treatment, particles obtained by laminating fine diamond abrasive grains on powder rubber were slid on the treated surface of a stainless steel plate (SUS304) with compressed air of 0.3 MPa. Here, the diameter of the powder rubber was 0.1 to 0.8 mm (average diameter was 0.5 mm), and the diameter of the diamond abrasive grains was 1.0 to 8.0 μm (average The diameter was 4.0 μm.). Further, during the special polishing treatment, the projection angle of the particles was set at 45° with respect to the surface to be treated, and the treatment time was set at 9 minutes.

2. Surface analysis of treated surface (1) Measurement of arithmetic mean height Sa and root mean square gradient Sdq Based on ISO 25178, the arithmetic mean height Sa and root mean square gradient Sdq at 5 points on the treated surface of the test plate were measured. The calculated arithmetic mean height Sa was 0.772 μm. Also, the root-mean-square gradient Sdq corresponding to the median value of the arithmetic mean height Sa was 0.325 (see Table 1).

In addition, the average values of the above five parameters were as follows.
・Arithmetic mean height Sa: 0.793 μm
・Root-mean-square gradient Sdq: 0.388

(2) Measurement of surface free energy When the surface free energy of the treated surface of this test plate was obtained in the same manner as in "(2) Measurement of surface free energy" in Example 1, the surface free energy of the treated surface of this test plate was The surface free energy was 29.92 mJ/m ² (see Table 1).

(3) Sliding test The sliding angle of each article was determined in the same manner as in "(3) Sliding test" of Example 1, and the results shown in Table 2 below were obtained.

1. Surface roughening treatment of stainless steel plate A first wet blasting treatment, a second wet blasting treatment and a special polishing treatment were performed in this order on the surface to be treated (130 mm × 100 mm) of a stainless steel plate (SUS304) to roughen the surface. was used as the target rough surface structure. The stainless steel plate thus obtained is hereinafter referred to as a "test plate".

Prior to the above treatments, an abrasive dispersion was prepared for each treatment. Specifically, 1800 g of ceramic particles with a 50% average particle size (median size) of 400 μm and 400 g of ceramic particles with a 50% average particle size (median size) of 50 μm are added to 23 L (23,000 g) of water and stirred. This was used as an abrasive dispersion for the first wet blasting treatment. Also, 1200 g of ceramic particles with a 50% average particle diameter (median diameter) of 2.0 μm and 500 g of ceramic particles with a 50% average particle diameter (median diameter) of 0.5 μm are added to 23 L (23,000 g) of water. It was stirred and used as an abrasive dispersion for the second wet blasting treatment.

In the first blasting treatment, the abrasive dispersion for the first wet blasting treatment was sprayed with compressed air of 0.3 MPa onto the treated surface of the stainless steel plate (SUS304) at a projection angle of 90° for 5 minutes. In the second blasting treatment, the abrasive dispersion for the second wet blasting treatment was sprayed with compressed air of 0.4 MPa onto the treated surface of the stainless steel plate (SUS304) at a projection angle of 60° for 4 minutes. In the special polishing treatment, particles obtained by laminating fine diamond abrasive grains on powder rubber were slid on the treated surface of a stainless steel plate (SUS304) with compressed air of 0.3 MPa. Here, the diameter of the powder rubber was 0.1 to 0.8 mm (average diameter was 0.5 mm), and the diameter of the diamond abrasive grains was 1.0 to 8.0 μm (average The diameter was 4.0 μm.). Further, during the special polishing treatment, the projection angle of the particles was set at 45° with respect to the surface to be treated, and the treatment time was set at 9 minutes.

2. Surface analysis of treated surface (1) Measurement of arithmetic mean height Sa and root mean square gradient Sdq Based on ISO 25178, the arithmetic mean height Sa and root mean square gradient Sdq at 5 points on the treated surface of the test plate were measured. The calculated arithmetic mean height Sa was 1.320 μm. Also, the root-mean-square gradient Sdq corresponding to the median value of the arithmetic mean height Sa was 0.524 (see Table 1).

In addition, the average values of the above five parameters were as follows.
・Arithmetic mean height Sa: 1.365 μm
・Root-mean-square gradient Sdq: 0.569

(2) Measurement of surface free energy When the surface free energy of the treated surface of this test plate was obtained in the same manner as in "(2) Measurement of surface free energy" in Example 1, the surface free energy of the treated surface of this test plate was The surface free energy was 29.67 mJ/m ² (see Table 1).

(3) Sliding test The sliding angle of each article was determined in the same manner as in "(3) Sliding test" of Example 1, and the results shown in Table 2 below were obtained.

(Comparative example 1)
1. Polishing Treatment of Stainless Steel Plate A surface (130 mm×100 mm) of a stainless steel plate (SUS304) was buffed with #400 to give the surface to be treated a rough surface structure. The stainless steel plate thus obtained is hereinafter referred to as a "test plate".

2. Surface analysis of treated surface (1) Measurement of arithmetic mean height Sa and root mean square gradient Sdq Based on ISO 25178, the arithmetic mean height Sa and root mean square gradient Sdq at 5 points on the treated surface of the test plate were measured. The calculated arithmetic mean height Sa was 0.020 μm. Also, the root-mean-square gradient Sdq corresponding to the median value of the arithmetic mean height Sa was 0.011 (see Table 1).

In addition, the average values of the above five parameters were as follows.
・Arithmetic mean height Sa: 0.021 μm
・Root-mean-square gradient Sdq: 0.021

(2) Measurement of surface free energy When the surface free energy of the treated surface of this test plate was obtained in the same manner as in "(2) Measurement of surface free energy" in Example 1, the surface free energy of the treated surface of this test plate was The surface free energy was 51.43 mJ/m ² (see Table 1).

(3) Sliding test The sliding angle of each article was determined in the same manner as in "(3) Sliding test" of Example 1, and the results shown in Table 2 below were obtained.

(Comparative example 2)
1. Polishing Treatment of Stainless Steel Plate The surface to be treated (130 mm×100 mm) of a stainless steel plate (SUS304) was electropolished to give the surface to be treated a rough surface structure. The stainless steel plate thus obtained is hereinafter referred to as a "test plate".

2. Surface analysis of treated surface (1) Measurement of arithmetic mean height Sa and root mean square gradient Sdq Based on ISO 25178, the arithmetic mean height Sa and root mean square gradient Sdq at 5 points on the treated surface of the test plate were measured. The calculated arithmetic mean height Sa was 0.237 μm. Also, the root-mean-square gradient Sdq corresponding to the median value of the arithmetic mean height Sa was 0.024 (see Table 1).

In addition, the average values of the above five parameters were as follows.
・Arithmetic mean height Sa: 0.241 μm
・Root-mean-square gradient Sdq: 0.022

(2) Measurement of surface free energy When the surface free energy of the treated surface of this test plate was obtained in the same manner as in "(2) Measurement of surface free energy" in Example 1, the surface free energy of the treated surface of this test plate was The surface free energy was 43.11 mJ/m ² (see Table 1).

(3) Sliding test The sliding angle of each article was determined in the same manner as in "(3) Sliding test" of Example 1, and the results shown in Table 2 below were obtained.

[Comparative Verification of Sliding Angles of Test Plates Produced in Examples and Comparative Examples]
As is clear from Table 2, the test plates according to any of the examples exhibited lower sliding angles than the test plates according to any of the comparative examples. This indicates that the test plate according to the example is superior to the test plate according to the comparative example in sliding and sliding properties. In addition, the test plate according to Example 1 exhibited superior gliding properties and sliding properties, particularly for cut cabbage, cut pineapple, and soda pop, compared to the test plates according to Comparative Examples 1 and 2 (Table 2 and Fig. 1 reference). In addition, the test plate according to Example 2 exhibited better gliding and sliding properties than the test plates according to Comparative Examples 1 and 2, especially for dried fish, wieners, and hard candy (Table 2 and Fig. 2 reference). In addition, the test plate according to Example 3, especially for frozen hamburgers, waffles, and deep-fried tofu, showed better sliding properties and sliding properties than the test plates according to Comparative Examples 1 and 2 ( Table 2 and Figure 3 ).

Claims (9)

The member is subjected to wet blasting treatment multiple times under different conditions and then polishing treatment, and the arithmetic mean height Sa is in the range of 0.10 μm or more and 2.00 μm or less, and the root mean square gradient Sdq is A method of roughening a member for forming a rough surface having a surface free energy of 40 mJ/m ² or less within the range of 0.10 or more and 0.70 or less. a first wet blasting step of wet blasting the member under a first condition to produce a member having a first rough surface;
a second wet blasting step of subjecting the member having the first rough surface to wet blasting under a second condition different from the first condition to produce a member having a second rough surface; ,
a polishing step of polishing the member having the second rough surface to produce a member having a third rough surface;
The third rough surface has an arithmetic mean height Sa within the range of 0.10 μm or more and 2.00 μm or less, and a root mean square gradient Sdq within the range of 0.10 or more and 0.70 or less, and A method for roughening a member having a surface free energy of 40 mJ/m ² or less. 3. The member surface roughening method according to claim 2, wherein said conditions include at least one factor of an average diameter of abrasive grains and a compounding ratio of said abrasive grains to a dispersion medium. 4. The member surface roughening method according to claim 3, wherein the average diameter of the abrasive grains under the second condition is smaller than the average diameter of the abrasive grains under the first condition. 5. The member surface roughening method according to claim 3, wherein two or more types of abrasive grains having different average diameters are used as the abrasive grains in the first wet blasting step and the second wet blasting step. The arithmetic mean height Sa is within the range of 0.10 μm or more and 2.00 μm or less, the root mean square gradient Sdq is within the range of 0.10 or more and 0.70 or less, and the surface free energy is 40 mJ / m A member having a rough surface of ² or less. The arithmetic mean height Sa is within the range of 0.10 μm or more and 0.30 μm or less,
The root mean square gradient Sdq is in the range of 0.10 or more and 0.30 or less,
7. The member according to claim 6, wherein the surface free energy is in the range of 25 mJ/ ^m2 or more and 35 mJ/m2 or ^less . The arithmetic mean height Sa is within the range of 0.50 μm or more and 1.00 μm or less,
The root mean square gradient Sdq is in the range of 0.30 or more and 0.50 or less,
7. The member according to claim 6, wherein the surface free energy is in the range of 25 mJ/ ^m2 or more and 35 mJ/m2 or ^less . The arithmetic mean height Sa is within the range of 1.00 μm or more and 2.00 μm or less,
The root mean square gradient Sdq is in the range of 0.50 or more and 0.70 or less,
7. The member according to claim 6, wherein the surface free energy is in the range of 25 mJ/ ^m2 or more and 35 mJ/m2 or ^less .

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