JP6885084B2 - Method of slicing resin molded product - Google Patents

Description

The present invention relates to a method for slicing a resin molded product, and more particularly to a slicing method capable of obtaining slice pieces of a resin molded product with a high yield.

Conventionally, as a method for producing various sheet materials such as a heat conductive sheet and a conductive sheet, a method of slicing a resin formed body to obtain a sheet made of sliced pieces of the resin molded body has been used.

Specifically, for example, in Patent Document 1, a composite material containing a resin and graphite particles is formed into a sheet to obtain a primary sheet in which the graphite particles are oriented in the in-plane direction, and then the obtained primary sheets are laminated. By slicing the resin molded body made of the laminated body obtained in the above-mentioned manner in the laminating direction, a heat conductive sheet having excellent thermal conductivity in the thickness direction is manufactured.

Further, as an apparatus for slicing a resin molded body formed by using a composite material, a slider mechanism that slides the resin molded body while pressing the side surface of the resin molded body while pressing the slide surface, and a slider mechanism protruding from the slide surface. A slicing device including a blade is used (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2010-132856 Japanese Unexamined Patent Publication No. 2011-218504

Here, in the production of a sheet made of sliced pieces of a resin molded body, it is required to obtain the sliced pieces of the resin molded body with a high yield.

However, the yield cannot be sufficiently increased by the method of slicing a resin molded product using the above-mentioned conventional slicing device. Specifically, in the above-mentioned conventional slicing device, since the resin molded body portion gripped by the slider mechanism cannot be sliced, the resin gripped by the slide mechanism in order to firmly grip and slice the resin molded body. When the proportion of the molded product portion was increased, the yield could not be sufficiently increased. Further, in the above-mentioned conventional slicing apparatus, if the ratio of the resin molded body portion gripped by the slide mechanism is reduced in order to increase the slicable portion of the resin molded body, the ungrasped resin molded body portion is deformed during slicing. It became easier and the yield could not be increased sufficiently.

Therefore, an object of the present invention is to provide a slicing method capable of obtaining a slice piece of a resin molded product with a high yield.

The present invention aims to advantageously solve the above problems, and the method for slicing a resin molded body of the present invention is a resin molding method for slicing a resin molded body held in a holder to obtain sliced pieces. In a method of slicing a body, the holder has a holding surface that abuts on the side peripheral surface of the resin molded body and holds the resin molded body, and a part of the resin molded body is a lower end of the holder. A step (A) in which the resin molded body is held by the holder so as to project downward, and the resin molded body held by the holder is placed at the slice start position, and the step (A). Later, a step (B) of moving the resin molded body held by the holder relative to the slicing blade and slicing the resin molded body protruding from the lower end of the holder one or more times, and the step (B). ), A step (C) of arranging the resin molded body partially sliced and held in the holder at the extrusion start position, and after the step (C), the resin molded body is held in the holder. A step (D) of pressing the resin molded body downward to push a part of the resin molded body downward from the lower end of the holder, and after the step (D), the resin molded body is held by the holder. The resin molded body is placed at the slicing start position, the resin molded body held by the holder is moved relative to the slicing blade, and the resin molded body protruding from the lower end of the holder is sliced at least once. It is characterized by including the step (E) of the process. In this way, if the steps (C) and (D) are carried out after the steps (A) and (B) are carried out, the resin molded body portion held by the holder can be sliced in the step (E). Can be done. Therefore, while firmly holding the resin molded body with the holder and suppressing the resin molded body portion from being deformed during slicing, the resin molded body portion held by the holder is extruded from the holder and sliced. Therefore, slice pieces can be obtained with a high yield.

Here, in the method for slicing the resin molded product of the present invention, it is preferable that the coefficient of static friction of the sandwiching surface is 0.1 or more and 1.1 or less. This is because if the coefficient of static friction of the sandwiching surface is within the above range, the holding performance of the resin molded product and the extrudability of the resin molded product in the step (D) can be compatible at a high level.
In the present invention, the "coefficient of static friction" can be measured in accordance with JIS K7125.

Further, in the method of slicing a resin molded product of the present invention, in the step (D), an external force of 100 N or more and 10000 N or less is applied to the resin molded product held by the holder to direct the resin molded product downward. It is preferable to press. This is because if the magnitude of the external force applied to the resin molded product in the step (D) is within the above range, the resin molded product can be satisfactorily extruded.

Further, in the method of slicing the resin molded product of the present invention, in the step (D), the resin molded product can be pressed through the pressing tool placed on the resin molded product held by the holder. preferable. By pressing the resin molded body through the pusher, it is possible to prevent the resin molded body from coming into direct contact with the extrusion mechanism such as a rod used for extruding the resin molded body, and to prevent the resin molded body from sticking to the extrusion mechanism. This is because it can be prevented.

When a pusher is used, in the method of slicing a resin molded product of the present invention, at least the steps (B) to (E) are performed on the resin molded body held by the holder. It is preferable to carry out in a mounted state. If steps (B) to (E) are carried out with the pusher placed on the resin molded body held by the holder, slicing is performed while pushing the resin molded body downward by the weight of the pusher. This is because the resin molded product can be sliced even better.

When a pusher is used, in the method of slicing a resin molded product of the present invention, the pusher has an adhesive layer on the lower surface for fixing the resin molded body to the pusher, and at least the step (D) And step (E) is preferably performed in a state where the resin molded body is fixed to the pusher via the adhesive layer. If the steps (D) and (E) are carried out with the resin molded body fixed to the pusher, the proportion of the resin molded body portion held by the holder due to the extrusion of the resin molded body in the step (D) is increased. This is because the resin molded product can be sliced well even when the amount is reduced.

According to the method for slicing a resin molded product of the present invention, sliced pieces of a resin molded product can be obtained with a high yield.

It is a figure explaining the process of slicing a resin molded article according to an example of the slicing method of the resin molded article of this invention. It is a figure which shows the structure of an example of the holder which can be used when slicing a resin molded body, (a) is the front view of the holder, (b) is the top view of the holder. It is a figure which shows the structure of another example of the holder which can be used when slicing a resin molded article, (a) is a front view, (b) is a side view, (c) is a top view. is there. It is a front view of another example of a holder which can be used when slicing a resin molded article. It is a front view of still another example of a holder which can be used when slicing a resin molded article. It is a front view of an example of a presser which can be used in the method of slicing a resin molded article of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, those having the same reference numerals indicate the same components. Further, the present invention is not limited to the embodiments shown below.

(Slicing method)
The method for slicing a resin molded product of the present invention is used when slicing a resin molded product held in a holder to obtain sliced pieces. Specifically, in the method for slicing a resin molded product of the present invention, the resin molded product held by a holder having a holding surface that abuts on the side peripheral surface of the resin molded product and sandwiches the resin molded product is sliced. It is used to obtain sliced pieces.

The method for slicing the resin molded product of the present invention includes a step (A) of holding the resin molded product in a holder and arranging it at a slicing start position, and slicing the resin molded product held in the holder one or more times. Step (B), and the step (C) of arranging the resin molded product sliced in the step (B) at the extrusion start position while being held by the holder, and the resin molded product held by the holder. The step (D) of pushing downward and the step (E) of arranging the resin molded body held by the holder at the slicing start position and slicing the resin molded body held by the holder one or more times. The feature is that it is carried out sequentially. In this way, if the steps (C) and (D) are carried out after the steps (A) and (B) are carried out, the resin molded body portion held by the holder during the execution of the step (B). Can be sliced in step (E). Therefore, according to the method for slicing a resin molded product of the present invention, the resin molded product is firmly held by the holder to prevent the resin molded product portion from being deformed during slicing, and is held by the holder. The resin molded part can be extruded from the holder and sliced. As a result, slice pieces can be obtained with a high yield.

In the method of slicing the resin molded product of the present invention, after the step (E) is performed, the sliced resin molded product is placed at the extrusion start position while being held by the holder, and is held by the holder. The step of pushing the resin molded body downward and the step of arranging the resin molded body held by the holder at the slicing start position and slicing the resin molded body held by the holder one or more times. It may be repeated sequentially. This is because if the operation of extruding the resin molded body portion held by the holder in the immediately preceding slicing step from the holder and slicing the resin molded body portion is repeatedly performed, the sliced pieces of the resin molded body can be obtained with a higher yield.

<Resin molded product>
Here, the resin molded product sliced by the slicing method of the resin molded product of the present invention is not particularly limited, and examples thereof include a resin molded product obtained by molding a material containing a resin by an arbitrary method. ..
The shape of the resin molded product is not particularly limited, and can be a shape according to the use of the obtained slice piece. Above all, the resin molded body is preferably a columnar shape such as a columnar shape or a polygonal columnar shape, and more preferably a square columnar shape.

Then, as the material used for molding the resin molded product, a material suitable for the intended use of the obtained slice piece can be used. Among them, as the material used for molding the resin molded product, it is preferable to use a composite material containing a resin and an inorganic filler and optionally further containing an additive. This is because if a composite material containing an inorganic filler is used, various performances such as strength, thermal conductivity, and conductivity can be imparted to the obtained slice pieces according to the type of the inorganic filler.
The resin is not particularly limited, and examples thereof include acrylic resin, epoxy resin, silicone resin, and fluororesin. The inorganic filler is not particularly limited, and examples thereof include carbon materials, boron nitride, aluminum nitride, and titanium oxide. Further, the additive is not particularly limited, and examples thereof include a flame retardant, a plasticizer, a toughness improver, a hygroscopic agent, an adhesive strength improver, a wettability improver, and an ion trap agent.

Among the above, when the obtained slice piece is used as a heat conductive sheet, the resin molded body includes a resin and a carbon material as an inorganic filler, and optionally further contains an additive. A resin molded product obtained by molding is preferable.
The carbon materials include particulate carbon materials (for example, artificial graphite, scaly graphite, flaky graphite, natural graphite, acid-treated graphite, expansive graphite, expanded graphite and other graphite; carbon black; etc.) and the like. It is preferable to use at least one of fibrous carbon materials (for example, carbon nanotubes, vapor-grown carbon fibers, carbon fibers obtained by carbonizing organic fibers, and cut pieces thereof), and at least a particulate carbon material is used. It is more preferable to use both the particulate carbon material and the fibrous carbon material.
Further, as a method for forming the resin molded body, the composite material is pressed to form a sheet to obtain a preheat conductive sheet, and then a plurality of the obtained preheat conductive sheets are laminated in the thickness direction. Alternatively, a method of folding or winding the obtained preheat conductive sheet to obtain a resin molded product made of a laminated body of the preheat conductive sheets is preferable.

<Holder>
As the holder, a holder having a holding surface that abuts on the side peripheral surface of the resin molded body and holds the resin molded body is used. That is, the holder can be brought into contact with surfaces (side peripheral surfaces) other than the upper surface and the lower surface (side peripheral surface) of the resin molded body and can be supported without dropping the resin molded body by its own weight, and is predetermined in the step (D) or the like. When the above external force is applied, a holder capable of pushing out the resin molded body held by the holder downward is used. In this way, if a holder having a holding surface that abuts on the side peripheral surface of the resin molded body and holds the resin molded body is used, the resin molded body is firmly held by the holding surface of the holder and the resin molded body is held. It is possible to suppress the portion from being deformed during slicing. Further, by pushing the resin molded body downward, the resin molded body portion held by the holder can be pushed out from the holder and sliced.

Specifically, as the holder, for example, one or more pairs of holding surfaces that abut on the side peripheral surface of the resin molded body and hold the resin molded body, and the resin molded body held by the holder are stepped (D). ) Etc., a jig having an upper opening for inserting a pusher or the like used for pushing downward and a lower opening from which a part (sliced portion) of the resin molded body protrudes can be used. More specifically, without particular limitation, examples of the holder include the holder 20 shown in FIG. 2 and the holder 20A shown in FIG.
From the viewpoint of increasing the ease of attachment of the resin molded body, the holder may be formed so as to be splitable and connectable by using an arbitrary fastening mechanism such as a screw hole and a screw. This is because if the holder is composed of a plurality of parts, the resin molded body can be easily attached by joining the parts in a state where the resin molded body is arranged. Further, from the viewpoint of facilitating gripping of the holder using a gripping device such as a chuck mechanism using a cylinder, a flange may be provided at the upper end of the holder. This is because if the flange is provided, the holder can be reliably gripped by preventing the holder from slipping off when the holder is gripped by the gripping device.

Here, the holder 20 whose front view is shown in FIG. 2A and whose top view is shown in FIG. 2B has a shape corresponding to the shape of the resin molded body, and the inner peripheral surface is a holding surface. It consists of a tubular body. Specifically, in the example shown in FIG. 2, the holder 20 is composed of a square tubular body having two pairs of holding surfaces 21 facing each other, and is used for holding a square columnar resin molded body. Then, for example, as shown in FIG. 1A, the resin molded body 10 is attached to the holder 20 so that a part of the resin molded body 10 protrudes from the lower opening. Further, the pusher 30 is arbitrarily inserted into the upper opening of the holder 20.
From the viewpoint of increasing the ease of attachment of the resin molded body, in the holder 20 made of a tubular body, a part of the side wall (for example, the side wall located on the lower side in FIG. 2B) is removed and reassembled. It may be formed so that it can be combined. Further, from the viewpoint of facilitating gripping of the holder 20 using a gripping device such as a chuck mechanism using a cylinder, a flange may be provided at the upper end of the side wall of the holder 20.

Further, the holder 20A, which shows a front view in FIG. 3A, a side view in FIG. 3B, and a top view in FIG. 3C, has a pair of side walls arranged so as to face each other. In the illustrated example, the side walls are provided with a pair of rod-shaped connecting portions that are connected to each other at the upper part. Then, in the holder 20A, the facing surfaces of the pair of side walls serve as the holding surfaces 21, and the resin molded body 10 is attached to the holder 20A so that a part of the resin molded body 10 protrudes from the lower opening. Further, the pusher 30 is arbitrarily inserted into the upper opening of the holder 20.
Similar to the holder 20 shown in FIG. 2, the holder 20A may be formed so that a part of the side wall (for example, the side wall located on the right side in FIG. 3B) can be removed and recombined. .. Further, a flange may be provided at the upper end of the side wall of the holder 20A. Further, in the holder 20A, the shape of the connecting portion connecting the side walls is not limited to a rod shape, but may be an arbitrary shape such as a plate shape. Further, in the holder 20A, the arrangement position of the connecting portion for connecting the side walls is not limited to the upper portion, and the connecting portion may be provided at the central portion or the lower portion in the height direction of the holder 20A. Good.

Here, in FIGS. 2 and 3, the case where the side wall is in the shape of a smooth plate and the holding surface 21 is a smooth surface is shown, but the shape of the holder is not limited to the above-mentioned shape. Specifically, as shown in FIGS. 4 and 5, for example, openings 22B and 22C may be provided on the side wall and the holding surface of the holder.

The coefficient of static friction of the holding surface of the holder is preferably 0.1 or more, more preferably 0.3 or more, preferably 1.1 or less, and 0.7 or less. Is more preferable. When the coefficient of static friction of the sandwiching surface is at least the above lower limit value, the holding performance of the resin molded product can be sufficiently improved. Further, when the coefficient of static friction of the holding surface is not more than the above upper limit value, the extrudability of the resin molded product in the step (D) can be sufficiently enhanced. Therefore, the resin molded body is prevented from being extruded diagonally in the step (D), and the uniformly extruded resin molded body can be sliced in the step (E) to obtain a slice piece having excellent surface accuracy. be able to.

<Pushing tool>
As described above, when extruding the resin molded product held by the holder, the pusher can be used. The pusher that can be arbitrarily used in the step (D) or the like is not particularly limited, and the resin molded body that can be inserted into the holder and is supported in the holder can be pushed out. A member having a possible length can be used. By using the pusher, it is possible to prevent the resin molded body from coming into direct contact with the pushing mechanism such as a rod used for pushing out the resin molded body, and to prevent the resin molded body from sticking to the pushing mechanism.

Specifically, the pressing tool is not particularly limited, and for example, the pressing tool 30 shown in FIG. 6 can be used.
Here, the pusher 30 shown in FIG. 6 has a columnar portion 31 inserted into the holder and a flange 32 provided on the upper portion of the columnar portion 31. The columnar portion 31 of the pusher 30 has a length equal to, for example, the side wall of the holder, and the flange 32 engages with the upper end of the holder with all the columnar portions 31 inserted in the holder. To do.

It is preferable to provide an adhesive layer on the lower surface of the pusher to fix the resin molded body to the pusher. That is, in the pressing tool 30 shown in FIG. 6, it is preferable to provide an adhesive layer on the bottom surface of the columnar portion 31. If an adhesive layer is provided on the lower surface of the pusher, the resin molded body can be sliced well even when the proportion of the resin molded body portion held by the holder is reduced due to the extrusion of the resin molded body. Can be done.

<Step (A)>
Then, in the step (A) of the method for slicing the resin molded product of the present invention, the resin molded product is held by the holder so that a part of the resin molded product protrudes downward from the lower end of the holder, and the holder is used. The held resin molded product is placed at the slice start position. Specifically, for example, as shown in FIG. 1A, the resin molded body 10 is held by the holder 20 so that a part of the resin molded body 10 projects downward from the lower end of the holder 20. Further, optionally, the pusher 30 is placed on the resin molded body 10 held by the holder 20. Then, the resin molded body 10 is lowered together with the holder 20, and the resin molded body 10 held by the holder 20 is placed at the slice start position on the slide surface 40 on which the slice blade 50 is installed.
In the steps (A) to (E) described in detail below, the resin molded body held by the holder may be moved and sliced manually, or the chuck holding the holder may be gripped. It may be performed by using a slicing device (for example, manufactured by Marunaka Iron Works Co., Ltd., trade name "Super Finishing Kanna Board Super Mecha S", etc.) including a mechanism and a slide mechanism for moving the gripped holder. Further, the resin molded body 10 held by the holder 20 may be arranged at the slice start position and the extrusion start position by moving the slide surface 40 on which the slice blade 50 is installed.

Here, when the resin molded body is composed of a laminated body of a plurality of sheets, in the step (A), the resin molded body is used as the holder so that both sides of the resin molded body in the stacking direction are sandwiched by the holding surface of the holder. It is preferable to hold it. A resin molded body made of a laminated body of a plurality of sheets is likely to be peeled off from each other and easily deformed during slicing. However, if both sides in the stacking direction are sandwiched between the holding surfaces of the holder, the resin molded body is easily separated during slicing. Can be sufficiently suppressed from being deformed.

Further, the length of the resin molded body protruding downward from the lower end of the holder is not particularly limited, and is preferably 0.5 mm or more and 30 mm or less, for example. If the length of the resin molded body protruding from the lower end of the holder is set to be equal to or less than the above upper limit value, it is possible to sufficiently suppress the deformation of the resin molded body during slicing. Further, if the length of the resin molded body protruding from the lower end of the holder is set to be equal to or larger than the above lower limit value, a sufficient amount of the resin molded body that can be sliced in the step (B) is sufficiently secured, and the sliced pieces are efficiently sliced. Obtainable.

<Process (B)>
Next, in the step (B), the resin molded body held by the holder is moved relative to the slicing blade, and the resin molded body protruding from the lower end of the holder is sliced once or more. Specifically, for example, as shown in FIG. 1B, the resin molded body 10 held by the holder 20 on the slide surface 40 is slid to the left in the illustrated example and protrudes from the lower end of the holder 20. The operation of slicing the resin molded body 10 is performed once or more.

The number of times the resin molded product is sliced can be any number as long as the holder does not come into contact with the slicing blade. Further, the slicing of the resin molded body may be performed by moving the resin molded body held by the holder with the position of the slicing blade fixed, or by moving the resin molded body held by the holder. It may be carried out by moving the slice blade in a fixed position, or by moving both the slice blade and the resin molded body held by the holder. Further, the slicing of the resin molded body may be performed while pressing the resin molded body against the slide surface with a force that does not push the resin molded body out of the holder.

Then, in the step (B), since the resin molded body firmly held by the holder can be sliced, the sliced pieces can be sliced while suppressing the resin molded body portion protruding from the holder from being deformed during slicing. Obtainable.

In the step (B), as shown in FIG. 1 (b), the resin molded body 10 is sliced with the pressing tool 30 placed on the resin molded body 10 held by the holder 20. Is preferable. If the resin molded body 10 is sliced with the pressing tool 30 placed therein, the resin molded body 10 can be sliced while being pushed downward by the weight of the pressing tool 30, so that the resin molded body 10 can be sliced even better. can do. Therefore, a slice piece having excellent surface accuracy can be obtained.

<Process (C)>
After that, in the step (C), the resin molded product partially sliced in the step (B) is placed at the extrusion start position while being held by the holder. Specifically, for example, as shown in FIG. 1 (c), the resin molded body 10 which is partially sliced and is held by the holder 20 is lifted upward and placed at the extrusion start position.

<Process (D)>
Next, in the step (D), at the extrusion start position, the resin molded body held by the holder is pressed downward to push out a part of the resin molded body below the lower end of the holder. Specifically, for example, as shown in FIG. 1D, an external force F is applied to the resin molded body 10 held by the holder 20 from above via the pressing tool 30, and one of the resin molded bodies 10 is applied. The portion is pushed below the lower end of the holder 20.

Here, the length of the resin molded body protruding downward from the lower end of the holder is preferably, for example, 0.5 mm or more and 30 mm or less for the same reason as in the step (A).

Further, the magnitude of the external force applied to the resin molded product in the step (D) is preferably 100 N or more, more preferably 1000 N or more, preferably 10000 N or less, and more preferably 5000 N or less. preferable. If the magnitude of the external force applied to the resin molded body in the step (D) is set to the above lower limit value or more, the resin molded body may be extruded diagonally due to friction between the resin molded body and the holder, and other extrusion defects may occur. It can be suppressed and the resin molded product can be extruded satisfactorily. As a result, a slice piece having excellent surface accuracy can be obtained in the next step (E). Further, if the magnitude of the external force applied to the resin molded body in the step (D) is set to be equal to or less than the above upper limit value, the resin molded body is suppressed from being excessively extruded, and the resin is formed during slicing in the next step (E). It is possible to sufficiently suppress the deformation of the molded product.

In the step (D), the resin molded body may be extruded without using the pusher, but when the resin molded body and the extrusion mechanism are brought into direct contact with each other, the resin molded body sticks to the extrusion mechanism. From the viewpoint of prevention, it is preferable to use a pusher.

Further, in the step (D), the amount of extruding the resin molded product may be adjusted by using the slide surface. Specifically, in the step (D), the extruding start position is set at a position where the distance between the lower end of the holder and the slide surface is equal to the length of the resin molded body to be projected from the lower end of the holder, and the slide surface is set. The amount of extruding the resin molded product may be adjusted by extruding the resin molded product until it comes into contact with the resin molded product. In this way, if the slide surface is used, the amount of extruding the resin molded product can be reliably adjusted.

Further, in the method for slicing a resin molded product of the present invention, the extruded state of the resin molded product may be confirmed after the step (D) is performed and before the step (E) is performed. Specifically, the extruded state of the resin molded body may be confirmed by using a mechanism for detecting whether or not the resin molded body is extruded diagonally. When the resin molded body is extruded diagonally, it is preferable to correct the extruded state so that the resin molded body is extruded straight. This is because if the next step (E) is carried out in a state where the resin molded body is extruded diagonally, the surface accuracy of the obtained slice piece is lowered.
The mechanism for detecting whether the resin molded body is not extruded diagonally is not particularly limited, and for example, a pressure-sensitive sensor for detecting whether the entire bottom surface of the resin molded body is in uniform surface contact; resin. Examples thereof include a slice surface formed of a transparent member capable of visually confirming whether the entire bottom surface of the molded body is in uniform surface contact; a mark such as a scale arranged on the side surface of the presser foot; and the like.

<Process (E)>
After that, in the step (E), the resin molded body extruded in the step (D) is placed at the slice start position together with the holder, and the resin molded body held by the holder is moved relative to the slice blade and held. The resin molded product protruding from the lower end of the tool is sliced at least once. Specifically, for example, as shown in FIG. 1 (e), after moving the resin molded body 10 held by the holder 20 to the slice start position on the slide surface 40, the holder is placed on the slide surface 40. In the illustrated example, the resin molded body 10 held by the 20 is slid to the left, and the operation of slicing the resin molded body 10 protruding from the lower end of the holder 20 is performed one or more times.

As in the step (B), the number of times the resin molded product is sliced can be any number as long as the holder does not come into contact with the slicing blade. Further, the slicing of the resin molded body may be performed by moving the resin molded body held by the holder with the position of the slicing blade fixed, or by moving the resin molded body held by the holder. It may be carried out by moving the slice blade in a fixed position, or by moving both the slice blade and the resin molded body held by the holder. Further, the slicing of the resin molded body may be performed while pressing the resin molded body against the slide surface with a force that does not push the resin molded body out of the holder.

Then, in the step (E), since the resin molded body firmly held by the holder can be sliced, the sliced pieces can be sliced while suppressing the resin molded body portion protruding from the holder from being deformed during slicing. Obtainable. Further, in the step (E), since the resin molded body portion held by the holder can be sliced during the execution of the step (B), the sliced pieces of the resin molded body can be obtained with a high yield. ..

In the step (E), as shown in FIG. 1 (e), the resin molded body 10 is sliced with the pressing tool 30 placed on the resin molded body 10 held by the holder 20. Is preferable. If the resin molded body 10 is sliced with the pressing tool 30 placed therein, the resin molded body 10 can be sliced while being pushed downward by the weight of the pressing tool 30, so that the resin molded body 10 can be sliced even better. can do. Therefore, a slice piece having excellent surface accuracy can be obtained.

Further, in the step (E), it is more preferable to perform slicing in a state where the resin molded body is fixed to the lower surface of the presser foot using an adhesive layer or the like. When slicing is performed with the resin molded body fixed to the lower surface of the pusher, the proportion of the resin molded body portion held by the holder is reduced due to the extrusion of the resin molded body in the step (D). However, the resin molded product can be sliced well. As a result, slice pieces of the resin molded product can be obtained with a higher yield.

<Subsequent process>
In the method for slicing a resin molded product of the present invention, the same operations as those in steps (C) to (E) described above may be sequentially repeated after the step (E) is carried out. If the operation of extruding the resin molded body portion held by the holder in the immediately preceding slicing step from the holder and slicing is repeatedly performed, for example, as shown in FIG. 1 (f), the resin molded body 10 is further extruded. Can be sliced. As a result, sliced pieces of the resin molded product can be obtained with a higher yield.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.
In Examples and Comparative Examples, the coefficient of static friction and the yield of the holding surface of the holder were measured and evaluated using the following methods, respectively.

<Coefficient of static friction>
The coefficient of static friction was measured using a small desktop tester (manufactured by Nidec Symposium, trade name "FGS-500TV") in accordance with JIS K7125. Specifically, an aluminum plate was used as the mating material, and the average value of the values measured three times was used as the coefficient of static friction.
<Yield>
Slice is performed until the surface accuracy of the heat conductive sheet (slice piece) is 20 μm or more, or the length of the resin molded body is equal to or less than the protrusion length of the slice blade from the slide surface, and the resin molded body before and after slicing is performed. The yield was calculated from the length of the above according to the following formula.
Yield (%) = {(length of resin molded product before slicing-length of resin molded product after slicing) / length of resin molded product before slicing} × 100
"Surface accuracy" is determined by measuring the thickness of the obtained heat conductive sheet at five locations (four corners and center) with a film thickness meter (manufactured by Mitutoyo, trade name "Digimatic Indicator ID-C112XBS"). It is also the value of the standard deviation of the thickness of the heat conductive sheet.

(Example 1)
<Manufacturing of resin molded products>
0.1 parts by mass of carbon nanotubes (CNT) prepared by the super growth method and 50 parts by mass of expanded fluoropolymer (manufactured by Ito Graphite Industry Co., Ltd., trade name "EC-100", average particle size: 190 μm). And 100 parts by mass of a thermoplastic fluororesin (manufactured by Daikin Industries, Ltd., trade name "Daiel G-101") that is liquid at room temperature are mixed to obtain a composition obtained by mixing Wonder Crush Mill (manufactured by Osaka Chemical Co., Ltd., product). It was put into the name "D3V-10") and crushed for 1 minute.
Next, 5 g of the crushed composition was sandwiched between sandblasted polyethylene terephthalate films having a thickness of 50 μm, and under the conditions of a roll gap of 550 μm, a roll temperature of 50 ° C., a roll linear pressure of 50 kg / cm, and a roll speed of 1 m / min. Roll molding was performed to obtain a composite material sheet having a thickness of 500 μm. Then, the obtained composite material sheet was cut into 6 cm × 6 cm × 500 μm, 120 sheets were laminated in the thickness direction, pressed at a temperature of 120 ° C. for 3 minutes under the condition of a pressure of 0.1 MPa, and thermocompression-bonded to obtain a thickness of about. A 6 cm square columnar laminate (resin molded product) was obtained.
<Slice of resin molded product>
A polyethylene terephthalate (PET) film (Toray) with a thickness of 75 μm was prepared by preparing a square tubular body whose inner peripheral dimension is equal to the outer peripheral dimension of the resin molded body, and performing a mold release treatment on the inner peripheral surface of the prepared square tubular body. A film-processed product, trade name "Therapeutic BX8", static friction coefficient: 0.1) was attached with double-sided tape to form a holder.
Next, the resin molded body is placed on the inner peripheral surface side of the holder so that the stacking direction of the resin molded body is orthogonal to the axis of the holder and the resin molded body protrudes 5 mm from the lower end of the holder. I set it. Then, the slice of the resin molded body portion protruding from the holder (5 times) and the resin molded body held by the holder by applying an external force of 1000 N from above to the bottom are transferred from the lower end of the holder to the resin molded body. The operation of extruding the resin so as to project 5 mm was alternately repeated to obtain a heat conductive sheet (slice piece) having a length of 6 cm, a width of 6 cm, and a thickness of 150 μm.
The slicing was performed using a woodworking slicer (manufactured by Marunaka Iron Works Co., Ltd., trade name "Super Finishing Planer Super Mecha S") while pressing the resin molded body against the slide surface at a pressure of 0.1 MPa. Here, the slicing direction is set to an angle of 0 degrees with respect to the laminating direction of the resin molded body, and in the knife of the woodworking slicer, the two single-edged blades come into contact with each other on the opposite sides of the cutting blade, and the cutting edge of the front blade. The cutting edge of the back blade is 0.10 mm higher than the cutting edge of the back blade, the protrusion length from the slit is 0.16 mm, and a two-blade blade having a front blade angle of 21 ° is used. Further, the resin molded body was extruded using a pusher as shown in FIG. 6, and as shown in FIG. 1, the pusher was placed on the resin molded body even during slicing.
Then, the yield was evaluated. The results are shown in Table 1.

(Example 2)
Same as Example 1 except that the film to be attached to the inner peripheral surface of the square tubular body was changed to a slightly adhesive film with a thickness of 75 μm (manufactured by Somar Co., Ltd., trade name “Somatac WA”, coefficient of static friction: 0.6). The resin molded product was produced and the resin molded product was sliced. Then, the yield was evaluated in the same manner as in Example 1. The results are shown in Table 1.

(Example 3)
A 75 μm-thick polyethylene terephthalate (PET) film (manufactured by Toray Film Co., Ltd., trade name “Therapele BX8”, static friction coefficient: 0.1) in which the facing surfaces of members having a shape as shown in FIG. The resin molded product was manufactured and the resin molded product was sliced in the same manner as in Example 1 except that the one attached with the double-sided tape was used as the holder. Then, the yield was evaluated in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 1)
An attempt was made to manufacture a resin molded product and slice the resin molded product in the same manner as in Example 1 except that an L-shaped holder having no holding surface was used, but the resin molding was performed during the slide. The body came off the holder and the resin molded product could not be sliced.

(Comparative Example 2)
Using a holder that covers a part of the upper surface and side surfaces of the resin molded body, set the resin molded body on the holder so that the resin molded body protrudes 30 mm from the lower end of the holder, and do not extrude the resin molded body. The resin molded product was produced and the resin molded product was sliced in the same manner as in Example 1 except that the resin molded product was sliced. Then, the yield was evaluated in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 3)
Using a holder that covers a part of the upper surface and side surfaces of the resin molded body, set the resin molded body on the holder so that the resin molded body protrudes 40 mm from the lower end of the holder, and does not extrude the resin molded body. An attempt was made to manufacture the resin molded product and slice the resin molded product in the same manner as in Example 1 except for slicing, but the resin molded product was deformed in the middle of slicing, and the surface accuracy of the sliced pieces was up to 20 μm or more. Slicing was interrupted because it worsened. Then, the yield was evaluated in the same manner as in Example 1. The results are shown in Table 1.

From Table 1, it can be seen that in Examples 1 to 3, slice pieces of the resin molded product can be obtained with a high yield. On the other hand, from Table 1, it can be seen that in Comparative Example 1, the resin molded product could not be sliced, and in Comparative Example 2, the holder interfered with the slicing and the yield could not be sufficiently increased. Further, in Comparative Example 3, it can be seen that the yield cannot be sufficiently increased due to the deformation of the resin molded product.

According to the present invention, slice pieces of a resin molded product can be obtained with a high yield.

10 Resin molded body 20 Holder 20A, 20B, 20C Holder 21 Holding surface 22B, 22C Opening 30 Pushing tool 31 Columnar part 32 Flange 40 Sliding surface 50 Slicing blade

Claims (6)

It is a method of slicing a resin molded product obtained by slicing a resin molded product held in a holder to obtain sliced pieces.
The holder has a holding surface that abuts on the side peripheral surface of the resin molded body and holds the resin molded body.
The resin molded body is held by the holder so that a part of the resin molded body protrudes below the lower end of the holder, and a slice blade is installed on the resin molded body held by the holder. Step (A) of arranging at the slice start position on the slide surface
After the step (A), the resin molded body held by the holder is moved relative to the slice blade on the slide surface, and the resin molded body protruding from the lower end of the holder is moved one or more times. Slicing step (B) and
After the step (B), a step (C) of arranging the resin molded body, which is partially sliced and held by the holder, at the extrusion start position,
After the step (C), a step (D) of pressing the resin molded body held by the holder downward and pushing a part of the resin molded body downward from the lower end of the holder.
After the step (D), the resin molded body held by the holder is placed at the slice start position on the slide surface, and the resin molded body held by the holder is placed on the slide surface. The step (E) of slicing the resin molded product protruding from the lower end of the holder at least once by moving it relative to the slicing blade.
Only including,
In the step (D), the extruding start position is set at a position where the distance between the lower end of the holder and the slide surface is equal to the length of the resin molded product to be projected from the lower end of the holder, and the slide surface is set. A method for slicing a resin molded product, which adjusts the amount of extruding the resin molded product by extruding the resin molded product until it comes into contact with the resin molded product. The method for slicing a resin molded product according to claim 1, wherein the coefficient of static friction of the sandwiching surface is 0.1 or more and 1.1 or less. The resin molding according to claim 1 or 2, wherein in the step (D), an external force of 100 N or more and 10000 N or less is applied to the resin molded body held by the holder to press the resin molded body downward. How to slice the body. The resin molded product according to any one of claims 1 to 3, wherein in the step (D), the resin molded product is pressed via a pressing tool placed on the resin molded product held by the holder. Slicing method. The method for slicing a resin molded product according to claim 4, wherein at least the steps (B) to (E) are performed in a state where the pusher is placed on the resin molded product held by the holder. The pusher has an adhesive layer on the lower surface that fixes the resin molded body to the pusher.
The method for slicing a resin molded product according to claim 4 or 5, wherein at least the steps (D) and (E) are performed in a state where the resin molded product is fixed to the pusher via the adhesive layer.

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