JP4075107B2 - Method for producing molded product with fine hollow pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a molded article having a fine hollow channel used in, for example, a microchannel capillary electrophoresis apparatus.
[0002]
[Prior art]
Conventionally, as a method for forming a hollow body, there are methods for directly forming a hollow portion such as a blow molding method and a lost core method. However, these methods are inaccurate and cannot form a fine hollow body. For this reason, for example, when manufacturing a molded product having a hollow pipe having a cross section of 1 mm square, it is necessary to join two or more molded products each having a groove in at least one of them. Joining is performed by a method such as welding or vibration welding. However, in these steps, there is a problem that the cross section of the hollow body changes due to the following reasons. Therefore, if the cross sectional area is small, satisfactory accuracy cannot be maintained. First, in the case of the bonding method, there is a problem that the thickness of the adhesive layer affects the cross-sectional area, or the adhesive itself flows into the groove or protrudes. For example, when it is desired to make a pipe having a 10 μm square cross section, it is difficult to use an adhesive. Next, as for the ultrasonic welding method and the vibration welding method, since the materials to be joined are locally melted, for example, a pipe having a 10 μm square section is easily deformed and difficult to manufacture. is there.
[0003]
[Problems to be solved by the invention]
This invention is made | formed in view of this condition, and it aims at providing the method which can manufacture easily the resin-made molded article which has the fine hollow pipe line of a uniform cross-sectional shape.
[0004]
[Means for Solving the Problems]
That is, according to the present invention, a hollow pipe is formed by joining a second molded product serving as a lid to a first molded product in which a fine groove having a width of 1 mm or less and a depth of 1 mm or less is previously provided on the surface of a plastic resin molded product. In the method of forming the film , the film is inserted into the mold in the direction in which the fine groove forming surface of the first molded product is exposed, and the film covering the fine groove and its peripheral portion is disposed, and then the second molding is performed. The present invention relates to a method for manufacturing a molded product with a fine hollow pipe, wherein the first molded product and the second molded product are integrated by injection molding the product.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings showing examples. Reference numeral 1 denotes a first molded product in which fine grooves 2 are formed on the surface in advance. As a means for forming the fine groove 2, the surface of the first molded product 1 may be directly machined. However, because of low productivity and poor reproducibility of the fine shape, the surface of the mold is used. A method of injection molding or injection compression molding using a die manufactured by reversing electrocasting a master provided by machining such as direct diamond turning or etching is suitable. Reference numeral 3 denotes through holes provided at both ends of the fine groove 2. A plastic film 4 protects the fine groove 2 of the first molded product 1 and finally constitutes a pipe line, and is arranged so as to cover the fine groove 2 and its peripheral edge. 6 is a second molded article comprising a first lid of the molded article 1, is injection molded to integrate the first fine groove forming surface of the mold 1. FIG. 3 shows the cross-sectional shape of the mold. In the drawing, the fine groove and the convex protrusion 5 that abuts on the peripheral edge portion are provided on the inner surface of the mold opposite to the fine groove portion of the first molded product 1. The case is shown. Although this protrusion is not always necessary, since the protrusion can press the periphery of the fine groove of the first molded product 1 when the second molded product 6 is formed, the resin is prevented from wrapping around and the fine groove is protected. Can be achieved. Although the material of the 1st molded product 1 and the 2nd molded product 6 is not specifically limited, PMMA, a polycarbonate, etc. are used. The film 4 is desirably elastic, and a PET film, an epoxy elastomer, or the like is used. The size of the film 4 is such that at least the groove 2 is completely covered, and a thickness of 50 to 200 μm is used.
[0006]
The present invention, through the film to the first surface of the fine grooves on the molded article 1 in a mold, a method of integrating by injection molding of a further second molded article. In the case of this method, a structure in which the melted resin and the resin of the first molded product are brought into close contact with each other at the contact surface by the injection molding of the second molded product , and the film interposed around the groove is sandwiched. Form. At this time, regarding the groove shape on the first molded product , since there is a film, it is possible to avoid the influence of resin flow and the heat and pressure of the molten resin. Further, the inner surface of the molding die facing the fine groove forming surface of the first molded product is provided with convex projections that contact the fine groove and the peripheral portion thereof, while pressurizing the periphery of the fine groove of the first molded product. By injection molding, the groove shape and the film on the first molded product are pressed by the mold for the second molded product , so that the influence of the resin flow and the heat and pressure of the molten resin is avoided. be able to.
[0007]
【Example】
EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, this invention is not limited to this.
Example 1
First, a first molded product 1 made of an acrylic resin having an outer shape of 50 mm × 100 mm × 1 t is obtained by an injection molding method. In this injection mold, a piece mold in which soda glass is etched to form a groove shape and is inverted by Ni electroforming is embedded, and the width of the first molded product 1 is 100 μm on the surface side and the bottom surface side. A 70 mm long groove having a cross section of 50 μm and a depth of 50 μm is formed. Next, the first molded product 1 is inserted into an injection mold that can be insert-molded, a fine groove forming surface is arranged on the side where the second molded product 6 is injected, and a thickness of 100 μm is formed so as to cover the groove. Adhere PET film. The film size is set to 10 mm × 80 mm so as to sufficiently cover the groove. Next, the 2nd molded product 6 was shape | molded with the acrylic resin, and the molded product of 50 mm x 100 mm x 2t was obtained. The molded product with a fine hollow pipe obtained in this way had a uniform cross section throughout the pipe without deformation of the pipe.
[0008]
Example 2
A first molded product 1 was obtained in the same manner as in Example 1. Next, the first molded product 1 is inserted into an injection mold 7 as shown in FIG. 3, and an acrylic resin film 4 having a thickness of 40 μm is adhered so as to cover the fine groove of the first molded product 1. The size of this film is 10 mm × 80 mm, and is set so as to sufficiently cover the fine groove 2. Next, a convex projection 5 having a width of 3 mm and a height of 0.98 mm is provided on the mold of the second molded product 6 so as to cover the range of the outer periphery of the fine groove 2 and the through hole 3 of the first molded product 1. Then, the second molded product 6 was molded while pressurizing the periphery of the fine groove 2, and finally a joined body having an outer shape of the molded product of 50 mm × 100 mm × 2 t was obtained. The molded product with fine hollow pipes obtained in this way also had no uniform deformation, and the whole pipe had a uniform cross section.
[0009]
【The invention's effect】
According to the production method of the present invention, a resin molded product having a fine hollow pipe can be easily obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view of a first molded product showing an embodiment of the present invention.
FIG. 2 is a perspective view showing a positional relationship between a first molded product and a film showing an embodiment of the present invention.
FIG. 3 is a cross-sectional view of a main part of a mold showing an embodiment of the present invention.
FIG. 4 is a perspective view of a molded article with a hollow pipe showing an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st molded article 2 Fine groove 3 Through-hole 4 Film 5 Convex protrusion 6 2nd molded article

Claims (2)

  In a method of forming a hollow pipe by joining a second molded product serving as a lid to a first molded product provided with a fine groove having a width of 1 mm or less and a depth of 1 mm or less in advance on the surface of a plastic resin molded product The first molded product is inserted into the mold in the direction in which the fine groove forming surface is exposed, and a film covering the fine groove and the peripheral portion thereof is disposed, and then the second molded product is injection molded. By this, the manufacturing method of the molded product with the micro hollow channel for microchips characterized by integrating a 1st molded product and a 2nd molded product.   Provided on the inner surface of the molding die facing the fine groove forming surface of the first molded product is a convex projection that contacts the fine groove and its peripheral edge, and injects while pressing the periphery of the fine groove of the first molded product The method for producing a molded product with a micro hollow pipe for microchip according to claim 1, wherein the first molded product and the second molded product are integrated by molding.

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