CN101659105B

CN101659105B - Microfluidic control chip injection molding die

Info

Publication number: CN101659105B
Application number: CN2009103080651A
Authority: CN
Inventors: 宋满仓; 刘莹; 杜立群; 王敏杰; 刘冲
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2009-10-01
Filing date: 2009-10-01
Publication date: 2012-07-25
Anticipated expiration: 2029-10-01
Also published as: CN101659105A

Abstract

A microfluidic control chip injection molding die belongs to the technical field of the injection molding die. The injection molding die comprises an injection die die-set part and a cavity insert. The injection die die-set uses a two-plate type injection die die-set; the cavity insert comprises a fixed die insert, a moving die insert and a micro machining insert. The fixed die insert is arranged in a fixed die plate in a matching way and connected by a bolt; the micro machining insert of a microchannle of a molding chip is arranged in the fixed die insert in the matching way and connected with the fixed die insert; the moving die insert is arranged in a moving die plate in the matching way and connected by the bolt; after compound die, a cavity is formed between the micro machining insert and the moving die insert. The side structure of the cavity of the moving die insert is designed to be a rectangular through groove and has the same size with the chip products. The moving die plate adopts lengthening cross gate and stream-line fan gate design. The injection molding die can mold plastic microfluidic control chip with high efficiency on a large scale, further increases the manufacture level of the microfluidic control chip and promotes the application of the injection molding technology in the micro machinery system field.

Description

A kind of microfluidic control chip injection molding die

Technical field

The invention belongs to the injection forming mold technical field, specially refer to a kind of microfluidic control chip injection molding die that can molded surface has MCA.

Background technology

Micro-fluidic chip is to be integrated into basic operation units such as sample preparation related in the fields such as biological and chemical, reaction, separation, detection on the less chip of size; Under compression pump or electric field action, form microfluidic circuit, reach purpose the rapid analysis of sample high flux.At present, begun the more and more important effect of performance in fields such as analytical chemistry, life science and biomedical articles.Be a lot of equipment that the micro-analysis system of core just progressively replaces current Chemical Analysis Lab with the micro-fluidic chip, make chemical analysis walk out the laboratory, get into ward, production base and family, so the mass production of micro-fluidic chip is imperative.

The traditional material that is used for the moulding micro-fluidic chip has silicon, glass and quartz etc.; Because the plastic material cost is low, kind is many, be fit to processing in enormous quantities, technology simply and have advantage such as excellent biological compatibility, become the main material of micro-fluidic chip in recent years.

The main method of making plastic microfluidic chip at present is hot-forming, but its fabrication cycle is grown (3-10min), can't satisfy the potential great market demand of micro-fluidic chip.Compare with hot-forming, the microfluidic control chip injection molding cost is lower, efficient is higher, be more suitable for production in enormous quantities, therefore has vast potential for future development.

Summary of the invention

The object of the present invention is to provide a kind of microfluidic control chip injection molding die, be used for the micro-fluidic chip that molded surface has MCA, the chip of moulding can directly be used for bonding and sample survey.

Technical scheme of the present invention is following:

A kind of microfluidic control chip injection molding die mainly is made up of mould mould bases and cavity block two parts.Wherein the mould mould bases uses the two-plate injection mold base.Mold cavity is inserted partly to be inserted by fixed die insert, moving die insert and microfabrication and is formed.The microfabrication of formed chip microchannel is inserted and is made up of nickel plate or silicon chip, and the microprotrusion structure that is used for the formed chip microchannel on it is processed by accurate LIGA or photoetching technique.For preventing the microfabrication accidental damage of inserting, at first it is cooperated through screw or bonding mode to be installed in the fixed die insert, then it is installed in the solid plate as an overall co-ordination, connect through screw therebetween.Microfabrication is inserted and is placed in the fixed die insert, can make plastic melt directly fill the micro-protuberance part of microfabrication on inserting, and can effectively improve the moulding degree of duplicating of microprotrusion structure; And this design makes push rod be arranged in the back side that chip has microchannel surface, thereby can not stay the release vestige in chip microchannel one side.For obtaining the chip of rectangular shape, the dynamic model side adopts edge to piece together structure, and insert material is selected high-quality mould steel for use, to improve the die cavity polishing performance.The moving die insert cavity structure is designed to rectangular through slot, and shape is identical with the chip outward appearance.The moving die insert cooperation is installed in the moving platen, connects through screw.Behind the matched moulds, microfabrication insert and moving die insert between form die cavity.Adopt lengthening crossing current road, the design of streamlined fan gate on the moving platen, the fluid of fountain in advance that can avoid injection machine to penetrate gets into die cavity, produces forming defect at chip surface.

Effect of the present invention and benefit are: adopt this injection forming mold can high efficiency moulding plastics micro-fluidic chip in enormous quantities.Adopt the cavity block structure can conveniently obtain the rectangle die cavity, and can make product size be easy to adjustment through quick replacing cavity block; Do not release vestige in chip microchannel one side, both be convenient to follow-up chip bonding, prevent that sample from leaking yet; The die cavity polishing performance is good, can improve the light transmission of chip, improves sample analysis result's accuracy rate.The present invention efficiently solves in the microfluidic control chip injection molding process microchannel and duplicates the incomplete technical barrier of Denging, with the manufacture level that further improves micro-fluidic chip, promotes the application of injection molding technology in the micro mechanical system field.

Description of drawings

Fig. 1 is microfluidic control chip injection molding die assembling sketch map of the present invention.

Fig. 2 (A) is the microfluidic chip structure sketch map.

Fig. 2 (B) is the A-A cross section enlarged drawing of Fig. 1 (A).

Fig. 3 (A) is moving die insert 3 sketch map front views.

Fig. 3 (B) is moving die insert 3 sketch map vertical views.

Fig. 4 (A) is chip, cast gate and runner sketch map front view.

Fig. 4 (B) is chip, cast gate and runner sketch map vertical view.

Among the figure: 1 solid plate; 2 fixed die inserts; 3 microfabrication are inserted; 4 moving die inserts; 5 moving platens; 6 push rods.

The specific embodiment

Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed description.

The injection molding die for molding the present invention shown in Figure 2 microfluidic chip, the shape of plate structures, on which a cross microchannel cross-sectional shape of the channel depth of 50 Xie, Xie wide rectangle 80.

As shown in Figure 1; Injection forming mold one mould of the present invention two chambeies; Mainly comprise injection mold base and cavity block two parts; Cavity block is by fixed die insert 2, moving die insert 4 and be used on the formed chip the Ni-based microfabrication of microchannel and insert and 3 form, and fixed die insert 2 cooperates with solid plate 1 in the mould bases, and connects through screw; Microfabrication is inserted and 3 is cooperated with fixed die insert 2, and connects through screw with it, and microfabrication 3 surfaces of inserting maintain an equal level with solid plate 1 surface; Moving die insert 4 cooperates with moving platen 5 in the mould bases, and connects through screw; Behind the matched moulds, microfabrication insert 3 and moving die insert 4 between form die cavity.

Moving die insert 4 die cavities one side structure is designed to rectangular through slot, and shown in Fig. 3 (B), shape is identical with the chip goods.

The road design of flowing on the moving platen 5 is longer, and streamlined fan gate is adopted in the cast gate design, shown in Fig. 4 (A) and Fig. 4 (B).

During injection moulding; Plastic melt at first gets into the runner on the moving platen through the sprue bush of injection mold; The fountain type fluid at first gets into shown in Fig. 4 (B) crossing current two ends, road in advance, and follow-up fluid gets into reposefully through streamlined fan gate and is full of microfabrication 3 die cavities that form with moving die insert 4 of inserting, and cools off through pressurize; After the die sinking, obtain micro-fluidic chip by push rod 6 releases.According to actual conditions, whole injection moulding process needs 1-3min.

Claims

1. a microfluidic control chip injection molding die comprises injection mold base and cavity block two parts, it is characterized in that: wherein injection mold base is used the two-plate injection mold base; Cavity block comprises fixed die insert (2), moving die insert (4) and microfabrication insert (3); Fixed die insert in this injection mold (2) cooperation is installed in the solid plate (1), connects through screw; The microfabrication of formed chip microchannel insert (3) cooperate and to be installed in the fixed die insert (2) and to be attached thereto; Moving die insert (4) cooperation is installed in the moving platen (5), connects through screw; Behind the matched moulds, microfabrication insert (3) and moving die insert (4) between form die cavity; Moving die insert (4) cavity side structure is a rectangular through slot, and shape is identical with the chip goods; Moving platen (5) is gone up and is adopted lengthening crossing current road, the design of streamlined fan gate.