JP4420665B2 - Manufacturing method of hoop-molded product of resin channel parts - Google Patents

Description

In the present invention, a member made of a material that transmits laser light is provided on both sides of a member that is made of a material that absorbs laser light and generates heat, and a channel is formed, and laser welding is performed by irradiating the laser light from the transmitting member side. about the hoop article producer of how to continuously producing a resin flow path components to.

  Conventionally, as a method for producing a resin flow channel component, a method using an adhesive, a method using a die slide injection, a method using welding, and the like are known.

  The method using an adhesive is a technique in which halves of a hollow molded article are bonded to each other using an appropriate adhesive. Although it is the simplest method experimentally, a great deal of labor is required for selecting an adhesive and the like, and an extremely complicated and long processing time such as an adhesive application step and a drying step is required. In addition, there is a problem in that the components in the inspection fluid are affected by the adhesive.

As described in Japanese Patent Publication No. 2-38377, the method by die slide injection is provided with a male mold and a female mold for molding a divided body obtained by dividing a hollow molded product into two in one mold, After each divided body is injection-molded, slide one mold, face the divided bodies left in the other mold, and inject molten resin to the periphery of the butted surface. We try to weld them together. (See Patent Document 1.)
This method is superior in that a hollow structure can be formed in the resin injection molding process, but an injection mold having a special slide structure is required for each product having a different shape, which increases equipment costs. There is a big problem in terms of cost. Further, with this technique, it is difficult to precisely form a flow path having a very small width.

The method by welding is a method in which, after combining previously molded resin halves, energy is applied from the outside to melt and contact the contact surfaces. This method is classified into a hot plate welding method, a vibration welding method, an ultrasonic welding method, and the like depending on the type of energy applied. The hot plate welding method is easily affected by radiant heat, the vibration welding method is liable to cause cracks and breakage of the welded part itself due to vibrations, and the ultrasonic welding method is subject to cracking and breakage of the welded part itself due to vibrations, as well as burrs. There is a problem that it is likely to occur.
Therefore, these methods are widely used industrially and have high reliability, but have a problem that they are not suitable for joining relatively small structures.

As another welding method, there is a laser welding method using laser light.
Japanese Patent Publication No. 62-49850 discloses a method of irradiating a laser beam from the material side transmissive to the laser beam to heat and melt the laser beam non-transparent material and welding them together. (See Patent Document 1.)
However, this method does not show a selective partial welding method necessary for obtaining a plastic flow path member having a hollow circuit structure inside the resin molded body.

  Japanese Patent Application Laid-Open No. 2000-218698 discloses a method of selectively welding only a desired joining region using a laser welding method. In this method, by installing a masking jig between the laser light source and the resin bonding member, only the resin in the desired region can be melted and bonded. However, if the desired welding area is complicated and fine, precision is required in adjusting the positional relationship between the masking jig and the welded part, which causes a problem of complicated processing.

Japanese Patent Publication No. 2-38377 (Claim 1, FIG. 7) Japanese Examined Patent Publication No. 62-49850 (Claims, Fig. 1) JP 2000-218698 A (Claim 1, FIG. 4)

An object of the present invention is to provide a resin flow path component having a fluid circuit structure formed therein in a simple and efficient manner in manufacturing from a large structure to a fine structure.

The present inventor forms a molded product such as a film made of a thermoplastic resin that is non-transparent to a predetermined laser beam by using resin members made of a thermoplastic resin that is transparent to a predetermined laser beam. Using a resin member that has been processed into a desired flow path shape in advance, and irradiating a laser beam from the resin member side exhibiting the transparency, thereby producing a desired resin flow path component ; and The present invention was completed by finding that the resin flow path component can be continuously produced by using a hoop molded product as a molded product made of a thermoplastic resin that is impermeable to the laser beam. I let you.

That is, the present onset Ming, walls made of a non-transmissive resin member (2) relative to the laser beam (6) and the wall toward fit wall (6) (7), and, sandwiching said resin member (2) A flow path having a flow path (5) surrounded by a bottom (3a) made of resin members (3) and (4) transparent to laser light and a bottom (4a) facing the bottom (3a) A method for manufacturing a hoop-molded product of resin flow path parts for continuously manufacturing parts, on the sheet-shaped resin member (2) for hoop molding in which positioning holes are provided on both sides The inner part of the frame used as a resin flow path component and the outer part of the frame to be removed after manufacture are set, and the wall (6) and the wall (7) are formed in the resin member (2) of the inner part of the frame. A notch is formed in a vertically penetrating shape, and the resin member (2) having the notch is made of a resin that is transparent to laser light. After sandwiched between timber (3) and the resin member (4), said resin member (3) and / or the resin member (4) is irradiated with laser light from the side, the resin member on both sides of the resin member (2) (3) a resin member (4) is a method for producing a resin flow path components of hoop shaped article, characterized in that to dissolve wear.
In the present invention , the resin member (3) and the bottom (3a) of the resin member (4 ) and / or the bottom (4a) on the side of the flow path forming side, and / or a recess that becomes a part of the flow path (5) and / or A convex part may be provided in advance .
In the present invention , a resin member (2 having a new notch on the outer surface side of at least one of the resin member (3) and the resin member (4) of the hoop-molded product of the obtained resin flow path component. ) , And the resin member (3) or the resin member (4) are sequentially installed, and then the manufacturing method is repeated to manufacture a hoop-molded product of a resin-made channel component in which channels are formed in multiple stages. You can also .
Resins having transparent to the laser light in the present invention is preferably at least one thermoplastic resin selected from the group consisting of acrylic resins, polycarbonate resins and cyclic olefin resins.
In the present invention, the flow path (5), can be made to form a one-dimensional, two-dimensional or three-dimensional shape.

  According to the present invention, a resin part in which a desired resin channel is integrated can be easily manufactured. The obtained resin flow path parts are suitably used for pump parts, bioanalytical instrument parts, and the like.

Hereinafter, the present onset bright, is described with reference to FIG. The resin flow path part obtained from hoop molded article obtained by this onset bright, the present invention is not limited thereto.
FIG. 1 is a cross-sectional view (FIG. 1 (a)) and a top view (FIG. 1 (b)) of a resin flow path component obtained from a hoop-molded product obtained by the present invention. A cross section perpendicular to the longitudinal direction of the flow path is simply referred to as a cross section .
Tree butter member 3 and resin member 4 is permeable to the laser beam. The resin member 2 is impermeable. Here, the non-transparent resin member is a resin member that has relatively low permeability as compared with the resin member 3 and the resin member 4, absorbs laser light and generates heat as much as necessary for fusion, and is completely opaque. It is not limited to a simple member.
When the three-layer laminated sheet having the above structure is irradiated with laser light from the resin member 3 side and / or the resin member 4 side, the resin member 2 absorbs the laser light to generate heat, and the surface 6a and the surface of the resin member 2 are heated. 7a is melted and welded to the contact portion of the resin member 3, and the surface 6b and the surface 7b of the resin member 2 are melted and welded to the contact portion of the resin member 4.
In the case of FIG. 1, a linear, ie one-dimensional, passage 5 is formed surrounded by the wall 6, the wall 7, the bottom 3a and the bottom 4a .
Also, when the thickness of the resin member 2 is large enough thin or when the thermal conductivity of only the resin member 3, or 4 side, be irradiated with laser light, the resin member 3 and on both sides of the resin member 2 The resin member 4 can be welded.

FIG. 4 shows an example in which two flow paths are formed. As long as the four surfaces are in close contact with each other and the fluid does not leak from the flow path, there is no particular limitation on how to cover it, and the end of the resin member 3 is part of the surface 6a of the strip-shaped sheet. You can make it cover, just overhang, or just cover it.

  FIG. 5 shows that a cover member 9a and a cover member 9b such as transparent glass or resin are provided on the upper and lower sides of the three-layer laminated sheet having the above-described structure in order to make the welding more reliable, and solidify at the time of welding or after welding. This is an example in which the three-layer laminated sheet can be pressurized from the outside before.

The resin member 2 may be a film, a sheet, or a plate. Further, the resin member 3 and the resin member 4 provided on both sides of the resin member 2 may be a film, a sheet, or a plate.
The thicknesses of the resin member 2, the resin member 3, and the resin member 4 are not particularly limited, are selected according to the purpose, and are determined in consideration of the pressure applied to the fluid.
The cross-sectional area and length of the flow path 5 are not particularly limited and are selected according to the purpose and are determined in consideration of the fluid flow rate.
Accordingly, the height of the walls 6 and 7 of the flow path and the width of the flow path are not limited, and specifically, may be 1 μm or more, 1 m or less, 1 mm or more, 1 cm or less, and combinations thereof. But you can.

Wall 6 and fits towards its wall 7, the cut produce one sheet such as walls 6 and wall 7 of the flow path, is formed so as to vertically penetrate the sheet. There is no particular limitation on the method of forming the cuts that cause the walls 6 and 7 in the sheet or the like in a vertically penetrating manner, and the sheet or the like is cut or punched, or a mold having the flow path shape is used. Examples thereof include a method of molding a resin into a sheet shape. By laser processing or the like, even a slit-like channel having a narrow channel width or a complicated channel can be precisely cut.

FIG. 6 shows an example of the resin member 2 in which cuts that form walls of a wide flow path and three flow paths having different widths are formed in a single sheet so as to penetrate vertically. is there. When the resin member 2 is sandwiched between the resin member 3 and the resin member 4 and irradiated with laser light from both sides, a two-dimensional flow path is formed.
The part surrounded by the frame in FIG. 6 is used as the resin member 2, and the other part outside the frame is a part for performing hoop molding for continuous production, and positioning holes are provided on both sides. Thus, it can be accurately placed on the resin member 4, and the outer portion of the frame is removed after the manufacture.
In this manner, by providing the outer portion of the frame, the walls of the flow path necessary for one sheet can be formed.

The cross section of the flow path is not particularly limited as long as it includes the four surfaces of the wall 6, the wall 7, the bottom 3a, and the bottom 4a. For example, a rectangular shape, a trapezoidal shape, a circular shape, or a combination thereof may be used. A uniform shape may be used. FIG. 1 is an example of a rectangular channel having a uniform cross section.
The cross-sectional shape in the longitudinal direction of the flow path is not particularly limited, and examples thereof include one or more single flow paths, folded flow paths, and their merged and branched flow paths. As shown in FIG.
A part of the flow path may be provided with a reaction vessel expansion portion, an orifice reduction portion or the like having a different volume or cross-sectional area.
There is no restriction | limiting in particular in the number of the inlets and outlets of a flow path, and the sum total is 1 or more, and each may be 1 or more. As shown in FIG. 1, the inlet and outlet of the flow path may be provided on an end face perpendicular to the longitudinal direction of the flow path of the resin flow path component 1 and an end face opposite to the end face. Or may be provided on an end face adjacent to these.

The bottom 3a, the bottom 4a, the wall 6 and the wall 7 may be provided in advance with a concave portion and / or a convex portion, which is a part of the flow path 5, on the flow path forming side, if necessary. FIG. 2 shows an example in which a concave portion 8b is formed on the bottom 3a, and FIG. 3 shows an example in which a convex portion 8a is formed on the bottom 3a.
The falling part of the concave portion increases the height of the cross section of the flow path, and the rising part of the convex part decreases the height of the cross section of the flow path.

  The resin member 2 may be used by bending a film, a sheet, or a plate and sandwiching it between the resin member 3 and the resin member 4. As a result, the flow path is formed three-dimensionally.

In FIG. 8, two strip-shaped resin members 2 are newly provided on the outer surface side of the resin member 3 of the resin flow path component obtained in FIG. 1, and the resin member 4 is newly provided thereon. In this example, the flow path is formed in two stages by irradiating a laser beam from the side of the newly provided resin member 4 so as to be a lid and performing laser welding.
By repeating the above steps, it is possible to manufacture a resin flow path component in which flow paths are formed in multiple stages. There is no limitation on the number of stages of the flow paths.

The type of laser is not particularly limited, and examples thereof include dye lasers, gas lasers (excimer lasers, argon lasers, krypton lasers, helium-neon lasers), solid state lasers (YAG lasers, etc.), and semiconductor lasers. As the laser light, a pulse laser is usually used.
In the welding of the resin, a laser having a wavelength of 1 μm or less, preferably 0.8 to 1.0 μm can be suitably used. Laser light in this wavelength range is absorbed by an additive such as carbon without being decomposed with respect to many transparent resins, and is efficiently converted into thermal energy, so that laser welding is possible.
The laser light may be a point light source, a line light source, or a surface light source, and may be scanned and irradiated as necessary.

Resin The resin used in the present invention may be a thermoplastic resin or a thermosetting resin, but is preferably a thermoplastic resin.
(1) Resin that is transparent to laser light The resin that is transparent to the laser light is a resin that absorbs the laser light and does not generate heat or little, and is not necessarily transparent to the naked eye. Alternatively, any resin can be used as long as it has a certain degree of transparency to the laser beam.
Examples of the resin include acrylate resins such as polymethyl methacrylate, polycarbonate resins, cyclic olefin resins, polyolefins such as polyethylene and polypropylene, polystyrene, styrene-acrylonitrile copolymers, ABS resins, polyamides such as nylon 6 and nylon 66, polyethylene terephthalate, Aromatic polyester such as polybutylene terephthalate, polyacetal, polyphenylene sulfide, etc., or a mixture or alloy thereof can be used.
Depending on the application of the resin flow path component, for example, when the inspection fluid flowing through the circuit is inspected by a spectroscopic analyzer such as infrared, visible, ultraviolet, etc., a resin that can transmit these light rays is preferable. Examples of resins having excellent characteristics include acrylate resins, polycarbonates, and cyclic olefin resins.
The resin transparent to the laser light is used for the bottom 3a and the bottom 4a as the resin member 3 and the resin member 4, but the resin member 3 and the resin member 4 are different resins even if they are the same resin. Also good.

(2) Resin impermeable to laser light The resin impermeable to laser light is a resin or a resin composition in which the resin itself absorbs the laser light and generates heat. In the present invention, both are not distinguished and are referred to as non-permeable resins.
Examples of the non-permeable resin composition include a transparent resin or a non-permeable resin to which a laser light absorber such as carbon black is added. In addition, you may use what added reinforcement fibers, such as glass fiber and carbon fiber, as needed.
Moreover, about the combination of the said permeable resin and the said non-permeable resin, the combination of mutually compatible things is preferable.
Laser light absorbers include carbon nanoparticles such as carbon black, fullerene and carbon nanotubes, organic or inorganic pigments or dyes, reinforcing materials such as glass fibers, glass flakes, glass beads, mica, talc, carbon fibers, and various whiskers. Or a filler, and two or more of these may be used in combination.
The blending amount of the laser light absorber with respect to the resin is 0.1 to 10 parts by weight, preferably 0.5 to 5 parts by weight with respect to 100 parts by weight of the resin, although it depends on the kind of the laser light absorber and the resin. is there.

  The resin that is transparent to laser light and the resin that is not transparent may be the same material or different materials as long as laser welding is possible. When using the same permeable resin and adding a pigment such as carbon black to make a non-permeable resin, the weldability is good.

  In addition, a normal resin additive can be added to the resin. As resin additives, depending on the type of resin, plasticizers, heat stabilizers, lubricants, antiblocking agents, crystallization nucleating agents, autooxidants, antioxidants, UV stabilizers, antistatic agents, flame retardants, Examples include a dropping agent, a water-resistant agent, an antibacterial agent, a deodorizing agent, a deodorizing agent, a photodegradation accelerator, a biodegradation accelerator, a filler (inorganic additive or organic additive), an extender, or a mixture thereof.

The resin flow path parts obtained from the hoop molded product obtained by the present invention are heat exchangers, in particular heat exchangers such as portable information devices, plate heat exchangers such as fuel cells, trace chemical reaction devices, and inspections. It is used suitably for the apparatus for use.
When the resin member 3 or the resin member 4 is made of a material that is transparent to the light for analysis, the inspection fluid is caused to flow through the flow path 5 of the resin flow path component, and the resin member 3 or the resin member 4 side. The light for inspection is irradiated from the light, and the light for inspection of the resin flow path component is absorbed / transmitted from the side opposite to the incident side, or the light absorbed / reflected from the same side as the incident side is used. The inspection fluid can be inspected by ultraviolet analysis, visible light analysis, infrared analysis, fluorescence analysis, or the like.
In particular, when the resin member 3 and the resin member 4 are transparent, the light absorbed and transmitted from the side opposite to the incident side of the analysis light can be detected. By adding a test reagent from the flow path, it can be used for a wide range of applications such as medical testing and chemical analysis.
Conventionally, mainly glass flow path parts have been used for this application, but it took a lot of labor and time for processing. According to the present invention, it is possible to manufacture a large number of flow path components at low cost, and it is possible to perform a small amount and high accuracy inspection at a low cost.

(Example)
Hereinafter, the present invention will be described specifically by way of examples.
(A) Resin member that is transparent to laser light As a thermoplastic resin material, a transparent cyclic olefin resin (TOPAS (registered trademark) 8007: manufactured by Ticona) is used, and 70 × 50 by a commercially available injection molding machine. A flat plate having a thickness of 3 mm was formed. The molding conditions at that time are as follows.

(B) Production of a member that is non-transparent to laser light A commercially available extrusion using pellets colored by adding 0.5 wt% carbon black (MA600B manufactured by Mitsubishi Chemical Corporation) to the above cyclic olefin resin. A film having a thickness of about 50 μm and a width of about 300 mm was produced by a molding machine. From this original film, cutting was performed using a YAG laser device to produce a slitted film having the shape shown in FIG.
The slit forms a flow path, the flow path length is 50 mm each, and the flow path width is 0.5, 1.0, 2.0, 3.0, 4.0, 5 in order from the top of the page. 0.0 mm, and each slit is partitioned by a wall of 5 mm or more.

(C) Laser welding The resin member that is transmissive to the laser beam and the non-transparent resin member that are produced as described above are laminated as shown in FIG. 7B, and the following semiconductor laser welding machine is used. The welding was performed.
Semiconductor laser welding machine: NOVOLAS C / Leister laser wavelength: 0.81-0.94μm
Output setting: 5W
Laser irradiation spot diameter: 1.5mm
Scanning speed: 30mm / sec

Resin channel component The obtained welded product was cut at the broken line as shown in FIG. 7 (d) to obtain a resin channel component having outlets at both ends.
Compressed air was connected to one end face of the obtained resin flow path component, and the other end face was placed in water and the pressure was adjusted to observe the generation of bubbles. As a result, continuous bubbles were observed from all six locations. It was confirmed that the fluid passage was reliably formed.

(A) is sectional drawing of an example of the resin-made flow-path components obtained from the hoop molded product obtained by this invention. (B) is a top view of an example of a resin flow path component obtained from a hoop molded product obtained by the present invention. It is sectional drawing of the other example of the resin-made flow-path components obtained from the hoop molded product obtained by this invention. It is sectional drawing of the other example of the resin-made flow-path components obtained from the hoop molded product obtained by this invention. It is sectional drawing of the other example of the resin-made flow-path components obtained from the hoop molded product obtained by this invention. A resin flow path part obtained from hoop molded article obtained by the present invention is a cross-sectional view of an example in which a cover material. It is an example of the non-permeable resin member in which the wall of the channel used for the present invention was formed. (A) is a top view of an example of the non-permeable resin member in which the wall of the flow path formed in the present invention is formed. (B) is sectional drawing of an example which provided the permeable resin member on both sides of the non-permeable resin member. (C) is a figure which shows the flow-path formation part of said (a). (D) is a figure which shows the position from which the resin-made flow-path components are cut out from the hoop molded product obtained by this invention. It is sectional drawing of the other example of the resin-made flow-path components obtained from the hoop molded product obtained by this invention.

Explanation of symbols

1 resin flow path component 2 (non-permeable) resin member 3 (permeable) resin member 4 (permeable) resin member
3a bottom
4a Bottom of channel 5 Channel 6 Wall of channel
6a End face
6b End face 7 (Flow path) wall
7a End face
7b End face
8a Convex
8b recess
9a Cover member
9b Cover member
10 Laser light

Claims (5)

A wall (6) composed of a resin member (2) impermeable to laser light, a wall (7) facing the wall (6), and the laser light sandwiching the resin member (2) Continuous production of flow path parts having a flow path (5) surrounded by a bottom (3a) made of permeable resin members (3) and (4) and a bottom (4a) facing the bottom (3a) A method for manufacturing a hoop molded product of a resin flow path component ,
On the sheet-shaped resin member (2) for hoop molding provided with positioning holes on both sides, an inner frame portion used as a resin flow path component and an outer frame portion to be removed after manufacturing are set, The resin member (2) in the frame portion is formed with a notch that vertically penetrates the wall (6) and the wall (7) , and the resin member (2) having the notch is transmitted through the laser beam. After sandwiching between the plastic resin member (3) and the resin member (4) ,
Said resin member (3) and / or the resin member (4) is irradiated with laser light from the side, the resin member (3) and the resin member (4) be dissolved dressed on both sides of the resin member (2) A method for producing a hoop-molded product of a resin-made flow path component. The resin member (3) and the bottom (3a) and / or the bottom (4a) of the resin member (4) are provided in advance with a recess and / or a protrusion that is a part of the channel (5) on the channel forming side. , process for the preparation of the resin flow path components of the hoop molded article according to claim 1. The resin member (2) and the resin member (3) having a new notch on at least one outer surface side of the resin member (3) and the resin member (4) of the hoop-molded product of the resin flow path component obtained. ) or the resin member (4) after sequentially placed, the repeat manufacturing process to form a flow path in multiple stages, process for the preparation of the resin flow path components of the hoop molded article according to claim 1 or 2. Resin exhibiting permeability to said laser beam is at least one thermoplastic resin selected from the group consisting of acrylic resins, polycarbonate resins and cyclic olefin resins, it is described in claim 1 A method for manufacturing a hoop-molded product of resin flow passage parts. The manufacturing method of the hoop molded product of the resin-made flow-path components in any one of Claims 1-4 in which the said flow path (5) makes a 1-dimensional, 2-dimensional, or 3-dimensional shape .