CN111761824A - Method for manufacturing cuvettes for analyzing liquids - Google Patents

Method for manufacturing cuvettes for analyzing liquids Download PDF

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Publication number
CN111761824A
CN111761824A CN202010332893.5A CN202010332893A CN111761824A CN 111761824 A CN111761824 A CN 111761824A CN 202010332893 A CN202010332893 A CN 202010332893A CN 111761824 A CN111761824 A CN 111761824A
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CN
China
Prior art keywords
cuvette
welding
laser
cuvette portion
window portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010332893.5A
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Chinese (zh)
Inventor
F·内梅特
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
77 Elektronika Muszeripari Kft
Original Assignee
77 Elektronika Muszeripari Kft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 77 Elektronika Muszeripari Kft filed Critical 77 Elektronika Muszeripari Kft
Priority to CN202010332893.5A priority Critical patent/CN111761824A/en
Priority to HU2000257A priority patent/HUP2000257A1/en
Publication of CN111761824A publication Critical patent/CN111761824A/en
Priority to PCT/HU2021/050025 priority patent/WO2021214500A2/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
    • B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
    • B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip
    • B01L3/502707—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip characterised by the manufacture of the container or its components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
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    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
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    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
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    • B29C65/7805—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features
    • B29C65/7814—Positioning the parts to be joined, e.g. aligning, indexing or centring the parts to be joined comprising positioning features in the form of inter-cooperating positioning features, e.g. tenons and mortises
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
    • B29C65/782—Positioning the parts to be joined, e.g. aligning, indexing or centring by setting the gap between the parts to be joined
    • B29C65/7823—Positioning the parts to be joined, e.g. aligning, indexing or centring by setting the gap between the parts to be joined by using distance pieces, i.e. by using spacers positioned between the parts to be joined and forming a part of the joint
    • B29C65/7829—Positioning the parts to be joined, e.g. aligning, indexing or centring by setting the gap between the parts to be joined by using distance pieces, i.e. by using spacers positioned between the parts to be joined and forming a part of the joint said distance pieces being integral with at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
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    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/124—Tongue and groove joints
    • B29C66/1244—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue
    • B29C66/12443—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue having the tongue substantially in the middle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
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    • B29C66/12449—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue being asymmetric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
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    • B29C66/12463—Tongue and groove joints characterised by the female part, i.e. the part comprising the groove being tapered
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
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    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81266—Optical properties, e.g. transparency, reflectivity
    • B29C66/81267—Transparent to electromagnetic radiation, e.g. to visible light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9241—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power
    • B29C66/92441—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power the pressure, the force or the mechanical power being non-constant over time
    • B29C66/92443—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power the pressure, the force or the mechanical power being non-constant over time following a pressure-time profile
    • B29C66/92445—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power the pressure, the force or the mechanical power being non-constant over time following a pressure-time profile by steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/929—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools characterized by specific pressure, force, mechanical power or displacement values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • B29C66/949—Measuring or controlling the joining process by measuring or controlling the time characterised by specific time values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/951—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools
    • B29C66/9513—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools characterised by specific vibration frequency values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/951—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools
    • B29C66/9517—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools characterised by specific vibration amplitude values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7132—Bowls, Cups, Glasses

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Abstract

The present invention relates to a method for manufacturing a cuvette for analyzing a liquid, the method comprising performing welding to fix cuvette parts together. During the method, the following steps are performed: -fitting together an upper cuvette portion (10) comprising a transparent upper window portion (11) and a lower cuvette portion comprising a transparent lower window portion, thereby forming an analysis space between the upper window portion (11) and the lower window portion, wherein in the fitted together position the upper (10) and lower cuvette portions are in contact with each other along at least one peripherally closed welding path, whereafter the upper (10) and lower cuvette portions are welded together in a leak-proof manner along the welding path.

Description

Method for manufacturing cuvettes for analyzing liquids
Technical Field
The present invention relates to a method for manufacturing a cuvette for analyzing various liquids, for example a cuvette for optical analysis of urine.
Background
For the analysis of liquids (e.g. urine) there are a number of prior art cuvette designs. For the purpose of optical analysis, shallow cuvettes are generally used which enable the analysis (preferably by microscopy or digital image processing methods) of a liquid filled into the analysis space between transparent window sections located one below the other. In order to allow a simple manufacturing process, these containers consist of an upper and a lower part adjoining in parallel. The container comprises an inlet opening for filling with a liquid to be filled, and an outlet opening for escape of air from the container when the liquid is filled.
Containers suitable for material analysis and in particular liquid analysis are disclosed, for example, in US 7016033B 2, US 2001/0039056 a1, US 2005/0170522 a1, EP 0134627a2, EP 1188483 a2, WO 99/44743, and WO 2008/050165a1 belonging to the present applicant.
Disclosure of Invention
A disadvantage of the prior art solutions is that they do not provide a solution for manufacturing cuvettes suitable for the above purpose in a simple, safe and efficient manner. The invention is primarily suitable for manufacturing cuvettes according to the above mentioned prior art documents, but the method according to the invention can of course also be used for manufacturing different cuvettes by applying suitable modifications.
Another object of the invention is to provide a production method which allows to provide an efficient, leak-proof and simple production method in the case of ultrasonic welding and in the case of laser welding. It is a further object of the present invention to minimize or eliminate the disadvantages of the prior art manufacturing methods.
The object according to the invention is achieved by a method according to claim 1. Preferred embodiments of the invention are defined in the dependent claims.
Drawings
Preferred embodiments of the present invention are described below by way of example with reference to the accompanying drawings, in which:
figure 1 is a top view of a cuvette according to the invention, which is made by an ultrasonic welding process;
figure 2 is a side view of the cuvette according to figure 1;
figure 3 is a top spatial view of the lower part of the cuvette according to figure 1;
FIG. 4 is a cross-sectional view taken along the plane indicated by the dashed line in FIG. 1, illustrating the start of the ultrasonic welding process;
FIG. 5 is an enlarged view of the circled portion of FIG. 4;
FIG. 6 shows the cross-sectional view of FIG. 4 in a welded together state;
FIG. 7 is an enlarged view of the circled portion of FIG. 6;
figure 8 is a top view of a cuvette according to the invention, which is made by a laser welding process;
figure 9 is a top spatial view of the lower portion of the cuvette according to figure 8;
FIG. 10 shows a section taken along the section shown in FIG. 8 in a welded together state; and is
Fig. 11 is an enlarged view of the circled portion of fig. 10.
Detailed Description
The cuvette according to the invention, preferably a cuvette for urine analysis, is designed for optical analysis of a liquid filled therein. In this respect, the following description is mainly based on cuvettes disclosed in WO 2008/050165a 1. The optical analysis is preferably carried out under illumination by means of a microscope. Prior to analysis, the filled container was centrifuged to cause urine sediment to settle on the inner polished surface of the transparent lower window portion of the bottom of the container. One application of the container is the digital analysis of images produced by such deposits.
The cuvette is preferably made from a transparent (highly transparent) polycarbonate granulate stock, which is processed by injection moulding. Maintaining the clarity of the cuvette is important because the clarity of the cuvette also affects the analysis of the liquid to be contained therein. Therefore, the granules are preferably stored, dried and transported to the injection molding apparatus in a closed system. For example, the fineness of the air filter in the system is 0.3 microns, i.e. particles larger than the contaminant cannot enter between the feedstock particles, while smaller particles do not interfere with the analysis at the applied magnification.
The advantage of such a closed raw material preparation system is that it does not have to be installed in a clean room due to the use of filters. However, the subsequent steps of the process must be performed in a clean room that at least meets ISO 8 class requirements, and the air quality must be checked regularly. The clean room is maintained using air handling units known per se.
The cuvette halves are preferably manufactured by injection moulding. Their specific dimensions must be maintained within tight tolerances so that the subsequent steps of the process can be performed and the finished cuvette is fully functional. For this purpose, high-precision injection tools and electric injection molding machines are preferably used. Hydraulic or hybrid injection molding machines are, according to our experience, less suitable for providing such tight tolerance ranges.
The finished cuvette halves are removed from the injection moulding tool and then transported, preferably by a robot, to an assembly station. The robot then mounts the two halves to each other through the recess formed in the mounting station. The cuvette halves are held together by the mutually matching conical surfaces.
The leak-proof connections of the cuvette halves have to fulfil a number of conditions: sufficient mechanical strength, leak-proof sealing, minimal deformation, dimensional stability, surface cleanliness, and bubble-free filling of liquids.
The cuvette according to the figures comprises an upper cuvette part 10 and a lower cuvette part 20. The upper cuvette portion 10 shown in figure 1 is formed with a transparent upper window portion 11 designed for optical analysis. In order to improve the accuracy of the optical analysis, both sides of the upper window portion 11 have polished surfaces. Furthermore, in the upper cuvette portion 10 there is an inlet opening starting from the conical recess and an outlet opening designed to evacuate air from the container when liquid is being poured in.
Figure 2 shows a side view of the cuvette according to figure 1, wherein the upper cuvette portion 10 and the lower cuvette portion 20 are welded together.
Figure 3 shows a top spatial view of the lower cuvette portion 20 of an exemplary colorimetric cup. The lower cuvette portion 20 is also fitted with a transparent lower window portion 21 which is polished on both sides. According to the present invention, the thickness of the lower window portion 21 is less than 0.6mm, which results in a significant improvement in image clarity. In this way, improved identification of sediment particles in the urine sample can be ensured. As shown, a channel is formed in lower cuvette portion 20, the function of which is described in detail in WO 2008/050165a 1.
Figure 3 clearly shows the melt rim 22, which melt rim 22 is surrounded by walls within the flange of the lower cuvette portion 20. The melting edge 22 is designed to abut a ledge that extends around the edge of the upper cuvette portion 10. The height of the melting edge 22 is preferably about 0.25mm, the sides of which are at an angle of about 60 ° to each other.
Fig. 4 shows a cross-section indicated by a dashed line in fig. 1. The circled details of this cross section are shown in an enlarged view in fig. 5. In these figures, the melting edge 22 can be easily seen in the assembled state before welding. In this state, the top edge line of the melt rim 22 abuts the oppositely disposed flat surface of the upper cuvette portion 10.
In fig. 6 and 7, the cross-section and enlarged detail shown in fig. 4 and 5 are shown in a welded together state. In this state, the top of the melt rim 22 and the opposing surface area of the upper cuvette portion 10 are in a molten (fused together) state, thereby providing a leak-proof joint. The slot around the melting edge 22 and the flange protrusion surrounding the melting surface portion of the upper cuvette portion 10, the walls of which are placed opposite each other, also contribute to a leak-proof seal. The weld is indicated by the black dots in fig. 6 and 7.
Thus, to manufacture a cuvette, the upper cuvette portion 10 comprising the transparent upper window portion 11 and the lower cuvette portion 20 comprising the transparent lower window portion 21 are assembled together such that an analysis space is formed between the upper window portion 11 and the lower window portion 21. In the assembled together position, the upper cuvette portion 10 and the lower cuvette portion 20 are in contact with each other along at least one peripherally closed welding path. The embodiment shown in the figures includes a single weld path, but may of course include multiple weld paths in order to provide a safer seal. The upper cuvette portion 10 and the lower cuvette portion 20 are welded together in a leakproof manner along a welding path.
According to fig. 1 to 7, ultrasonic welding may preferably be applied, in which the melting edge 22 melts and coagulates on the surface of the peripheral protrusion of the upper cuvette portion 10. A low cost leak-proof weld joint can be achieved.
More preferably, the ultrasonic welding is performed based on the relative distance, and during the ultrasonic welding, when a predetermined trigger pressure is reached, that is, at this time, the ultrasonic generator provided at the tip of the welding head starts vibrating at a given frequency and amplitude, and the welding process ends after the predetermined distance has elapsed. The sonotrode will vibrate until the end of the preset relative distance. During this time, the melting edge 22 is first melted and then the welding head presses the two cuvette halves together completely for a predetermined cooling time, during which the melted material solidifies. The cooling time is preferably between 0.5 and 0.6 s.
The predetermined trigger pressure is preferably between 80 and 100N and the predetermined distance is preferably between 0.08 and 0.2 mm.
In a particularly preferred embodiment, a first welding pressure is applied along a first portion of the predetermined distance and a second welding pressure is applied along the remainder of the distance, the second welding pressure being at least 10% greater than the first welding pressure. The first welding pressure is preferably 90-150N, for example, and the second welding pressure is preferably 100-200N. The relative distance can be divided in correspondence with two forces, i.e. according to a preset, preferably when a partial distance preferably between 0.04 and 0.12mm has been covered, the welder changes from a smaller value to a larger value. This allows the melted edge 22 to be carefully handled at the beginning of the welding process and, if desired, a greater compressive force can be applied in the second stage of welding. Of course, the welding process may also be performed by applying a single force value.
During welding, the horn preferably vibrates at a frequency of between 30 and 40kHz, more preferably at a frequency of 35kHz, with an amplitude of between 21.4 and 34.1 μm.
After the welding process is completed, the upper cuvette portion 10 and the lower cuvette portion 20 are pressed together until the melted material solidifies again during the welding process.
As an alternative to ultrasonic welding, laser welding may also be used, as shown in fig. 8-11. In fig. 8 a top view of such a cuvette is shown in a welded together state. Of course, the figure only shows the upper cuvette portion 10, as the lower cuvette portion 20 shown in figure 9 is obscured by the upper cuvette portion 10.
When laser welding is used, a welding area 23 with a flat contact surface is preferred for providing a leak-proof joint. During the laser welding process, i.e. during the formation of the weld, the upper cuvette portion 10 and the lower cuvette portion 20 are pressed together along this welding area 23 without a gap. The basic condition for producing such a weld is that the two contact surfaces must be geometrically accurate and clean.
As can be seen in fig. 9, the lower cuvette portion 20 is provided with positioning members 24, which in the shown preferred embodiment are realized as circularly symmetric conical members. As shown in fig. 10, the member is adapted to fit in a corresponding recess of the upper cuvette portion 10 so that the portions are properly positioned relative to each other in the transverse direction. Fig. 11 is an enlarged view of the circled portion of fig. 10, showing the welding area 23.
In the case of laser welding, there are basically three alternatives regarding the concentration of the energy of the laser on the welding zone 23 for producing a leak-proof weld.
According to a first alternative, an absorbent material (i.e. a material adapted to absorb laser light) is applied to the surface of the welding zone 23. The absorbent material is preferably applied to the cuvette portion which is located at the bottom during welding, which may be either of the two cuvette portions. According to our experiments, in this case the best welding quality can be obtained by applying a laser with a wavelength between 780 and 1100nm, preferably 980 nm. The two cuvette halves have to be pressed together during the whole welding process.
The applied absorbent material may be, for example, an absorbent liquid selected from the Clearweld product line of Crysta-Lyn Chemical Company, i.e. a liquid of the LD 100, LD 200 or LD 900 family, preferably with the product code LD 940. The liquid was slightly greenish but became watery and transparent during the welding process. The heat generated during laser welding is concentrated in the absorbent liquid covered surface area, thereby reducing the stress inside the welded parts.
According to a second alternative to welding from above, the absorbent material is distributed in the material of the cuvette portion at the bottom. In this case, the laser penetrates the cuvette portion 10 at the top and the laser beam focused on the welding area 23 heats the material of the cuvette portion at the bottom. According to our experiments, in the case of this alternative, the best welding quality can be obtained by applying a laser with a wavelength between 900 and 1100nm, preferably 980 nm.
In this modification, for example, a powder type additive LWA267 manufactured by Crysta-Lyn Chemical Company, or an additive manufactured by GRAFE Color Batch GmbH may be used. In this case, the injection molding machine must have two injection units. One of the units is suitable for injection molding the upper half of the cuvette and the other unit is suitable for injection molding the lower half of the cuvette with the addition of the absorbent additive.
As a third alternative, a laser welding process that is completely free of absorbers may also be employed. In this case the welding area 23 of the pressed together cuvette parts itself forms an area with a different diffraction index, which is suitable for focusing the heating effect of the laser beam. In this case, the best quality of the weld is obtained using a laser with a wavelength much longer than that described above, i.e. a laser with a wavelength between 1800 and 2200nm, preferably 1940 nm.
In all three welding alternatives, the two cuvette halves are compressed under a given pressure (preferably by means of a glass plate), while the seam is formed by the welding head along the welding area 23.
The invention is of course not limited to the embodiments shown by way of example, but further modifications and alterations are possible within the scope of the claims. The cuvette can be used not only for optical analysis of urine, but also for optical analysis of other liquids.

Claims (11)

1. A method for manufacturing a cuvette for analyzing a liquid, the method comprising applying a weld to secure cuvette portions together, characterized in that the method comprises the steps of:
-assembling an upper cuvette portion (10) comprising a transparent upper window portion (11) and a lower cuvette portion (20) comprising a transparent lower window portion (21) together such that an analysis space is formed between the upper window portion (11) and the lower window portion (21), wherein in the assembled position the upper cuvette portion (10) and the lower cuvette portion (20) are in contact with each other along at least one circumferentially closed welding path, whereafter the upper cuvette portion (10) and the lower cuvette portion (20) are subsequently contacted together
Welding the upper cuvette portion (10) and the lower cuvette portion (20) together along a welding path in a leak-proof manner.
2. The method of claim 1, wherein the method applies ultrasonic welding.
3. The method of claim 2, wherein the method applies ultrasonic welding based on relative distance, comprising the steps of: when the predetermined trigger pressure is reached, the welding process is initiated with the welding head and completed after the predetermined distance is covered.
4. A method according to claim 3, characterized in that the predetermined trigger pressure is between 80 and 100N and the predetermined distance is between 0.08 and 0.2 mm.
5. The method according to claim 3, characterized in that after completion of the welding process the upper cuvette portion (10) and the lower cuvette portion (20) are pressed together until the melted material solidifies during the welding process.
6. A method according to claim 3, characterized in that during the welding the horn is vibrated at a frequency between 30 and 40kHz and an amplitude of 21.4 to 34.1 μm.
7. The method of claim 3, wherein a first weld pressure is applied along a first portion of the predetermined distance and a second weld pressure is applied along a remaining portion of the distance, the second weld pressure being at least 10% greater than the first weld pressure.
8. The method according to claim 1, characterized in that it applies laser welding wherein the upper cuvette portion (10) and the lower cuvette portion (20) are pressed together without gaps along the welding area (23) with flat contact surface.
9. Method according to claim 8, characterized in that an absorbent material is applied to the soldering region (23) at the cuvette portion of the bottom before the soldering process and a laser with a wavelength between 780-1100nm is used for the soldering process.
10. Method according to claim 8, characterized in that the cuvette section partly made of absorbent material used for the welding process is applied as a lower cuvette section and laser light with a wavelength between 900 and 1100nm is used for the welding process.
11. The method according to claim 8, characterized in that the absorber-free laser welding is performed with a laser having a wavelength between 1800 and 2200 nm.
CN202010332893.5A 2020-04-24 2020-04-24 Method for manufacturing cuvettes for analyzing liquids Pending CN111761824A (en)

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HU2000257A HUP2000257A1 (en) 2020-04-24 2020-08-06 Method for the production of cuvette suited to analysis of liquid
PCT/HU2021/050025 WO2021214500A2 (en) 2020-04-24 2021-04-23 Method for manufacturing a cuvette

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