CN104174447B - A kind of pipette and production technology thereof - Google Patents
A kind of pipette and production technology thereof Download PDFInfo
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- CN104174447B CN104174447B CN201410399348.2A CN201410399348A CN104174447B CN 104174447 B CN104174447 B CN 104174447B CN 201410399348 A CN201410399348 A CN 201410399348A CN 104174447 B CN104174447 B CN 104174447B
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Abstract
The present invention discloses a kind of pipette, comprises endonexine and extexine, endonexine with the mixture of PS and ABS for base-material, extexine with the mixture of PP or PVC or PP and PVC for base-material; The production technology of this pipette: (1) first time granulation: by the granulation respectively of the base-material of each layer, obtain the plastic matrix particle of each layer; (2) second time granulation: by additive each layer plastic matrix particle granulation again with gained respectively required in each layer raw material, obtain the plastic pellet of each layer; (3) dry; (4) extrusion molding; (5) cut, obtain cutting body; (6) cutting body is stretched, obtain head product; (7) head product is carried out print, filter core is installed, obtain finished product.The present invention adopts the design of two-layer equation, and the function of different layers required for it utilizes the plastic material of different qualities, then its characteristic is combined by suitable technique, under the condition of low cost, prepares all satisfactory pipette of various aspects of performance.
Description
Technical field
The present invention relates to experiment equipment field, specifically a kind of pipette and production technology thereof.
Background technology
Pipette can be widely used in clinical and scientific research experiment field, as tissue cultures, bacteriology, blood draw etc.Existing pipette is all single layer structure, utilize plastic extrusion shaping, the mode of welding can be adopted to produce, but single layer structure is difficult to meet each side requirement, requisite quality, but cost is not higher, otherwise cost is low, quality does not catch up with, and is difficult to the physical characteristic requirement meeting the inside and outside surface of pipette.And welding procedure is easily because the problems such as air pressure, environment, equipment cause the welding between ozzle, tube head to cause dry joint, weld askew (decentraction), weld and cause the quality problems such as overlap, and weld easily hangs liquid, cause and move liquid measure and do not prepare, as the patent No. Chinese patent that is CN103612389 a kind of pipette disclosed in the 5 days March in 2014 produces special equipment and production technology.All have much room for improvement from raw material and technique.
Summary of the invention
An object of the present invention is to provide a kind of pipette, adopts inside and outside double-decker, and by the improvement to component, overcomes the defect that in prior art, quality is good, the low difficulty of cost is satisfactory to both parties; Two of object of the present invention is to provide a kind of production technology of pipette, adopts one stretch forming process, avoids the deficiency existing for welding procedure, and by the grasp to technological parameter, obtain quality and reach a standard, the body pipette that especially ozzle place is non-friable.
In order to reach technique scheme, the present invention adopts following technical scheme: a kind of pipette, comprise endonexine and extexine, described endonexine with the mixture of PS and ABS for base-material, described extexine is with the mixture of PP or PVC or PP and PVC for base-material, and the Mixing ratio by weight of described PS and ABS is 1-3:5-10.
The program, adopts inside and outside double-decker, utilizes different base materials, the skin of pipette, owing to not contacting with moved liquid, do not need too smooth, but can graduation mark be marked, so to have certain roughness graduation mark adhesion effect better on surface, PP and PVC mechanical strength is large, wear-resistant, not easy to crack, low price is very suitable for extexine; And the internal layer of pipette and the liquid comes into contact that moves, need smooth surface, PS has high transparency, and light transmittance can reach more than 90%, and processing fluidity is good, good rigidly and chemical resistance good etc.But its property is crisp, the features such as impact strength is low, easily occurs stress cracking, and ABS product size is stable, lustrous surface is good, good springiness, non-friable, surface smoothness is good, but light transmission is poor, both mix by a certain percentage, make tough matter modified plastics, play respective premium properties separately, good combination property, impact strength.
As preferably, described extexine is with the mixture of PP and PVC for base-material, and the Mixing ratio by weight of described PP and PVC is 10-15:5-10.
As preferably, described extexine also comprises the plasticizer of the 10-15% accounting for described base-material gross weight, and described plasticizer is be that the methacrylate polymer of 2:3-5 and polyvinyl chloride form by weight ratio, can reduce the fragility of pipette, non-friable.
As preferably, described extexine also comprises the particle of the 0.5-5% accounting for described base-material gross weight, and the particle diameter of described particle is 10-30nm.
Particle one can improve the hardness of extexine, strengthens its support degree, non-friable; Two can also form small hole in outer skin surface, allow graduation mark adhere to more firm, difficult drop-off.
As preferably, described particle is silica granule or activated carbon granule.
A production technology for pipette, comprises the following steps:
(1) first time granulation: the plastic matrix of each layer is put into comminutor granulation respectively, is 160-190 DEG C at prilling temperature, and engine speed is under 80-100rpm condition, obtains the plastic matrix particle of each layer; (2) second time granulation: each layer plastic matrix particle puts into comminutor granulation respectively again with gained respectively by additive required in each layer raw material, and be 100-110 DEG C at prilling temperature, engine speed is under 50-70rpm condition, obtains the plastic pellet of each layer; (3) dry: each layer plastic pellet obtained is dried, makes the moisture content of the plastic pellet after oven dry be 0.1-0.5%; (4) extrusion molding: the plastic pellet after drying is put into extruder from the different conveying mouths of extruder, through co-extrusion pressure extrusion molding, obtains precursor; (5) described precursor is passed through cutting, obtain cutting body, cutting temperature is 120-180 DEG C; (6) described cutting body is carried out cold stretch, obtain head product; (7) described head product is carried out print, filter core is installed, obtain finished product.
This production technology:
1., by twice plasticizing granulation, the impact of additive on compatibility between different plastics can be kept away, ensure the strength and toughness of particle;
2. during excess moisture in plastics, its mobility is increased, molding cycle increases, shrink of product rate increases, porous and be easy to occur warpage, and surface reduces mechanical property and the dielectric properties of goods with ripple and vexed optical phenomenon, cause molecular chain rupture, intensity reduces; Can cause resin degradation generally when moisture content is no more than 0.05% containing moisture to make, these problems can be got rid of;
3. stretch in prior art and be generally hot-stretch, but when pipette cool to room temperature after hot-stretch, its size will shrink, and affect its accuracy, the ozzle place of pipette especially pipette easily ftractures.Cold stretch can head it off.
As preferably, the extruded velocity in described step (4) is 30-50m/min, and hauling speed is 10-20m/min, and extrusion temperature is 160-180 DEG C.
Extruded velocity is too high or too low, and extrudate surface can become coarse distortion and distortion, and suitable basal rate and extrusion temperature can ensure the surface flatness of pipette body drawing and forming, improves the quality of body.
As preferably, in described step (6), the temperature of cold stretch is 30-50 DEG C, and draw speed is 10-15m/min.
As preferably, in described step (6) after cold stretch, in described draft temperature, be incubated sizing.Shape again after cold stretch, be more conducive to improving the cracking of pipette.
As preferably, described shaping time is 15-20min.
By implementing technique scheme, the present invention has following beneficial effect: the present invention adopts the design of two-layer equation, the function of different layers required for it utilizes the plastic material of different qualities, by suitable technique, its characteristic is combined again, under the condition of low cost, prepare all satisfactory pipette of various aspects of performance; This technological process is simple, low for equipment requirements, and can play different plastics characteristic separately to greatest extent, reduces additive to the impact of plastic properties, obtains the high-quality pipette that everyway meets the demands.
Detailed description of the invention
Embodiment 1:
A kind of pipette, comprise endonexine and extexine, endonexine take Mixing ratio by weight as the mixture of PS and the ABS of 1:5 is base-material, extexine take PP as base-material, the plasticizer accounting for 15% of base-material gross weight and account for base-material gross weight 0.5%, particle diameter is the silica granule of 10nm, plasticizer is be that the methacrylate polymer of 2:3 and polyvinyl chloride form by weight ratio.
The production technology of this pipette comprises the following steps: (1) first time granulation: the plastic matrix of each layer is put into comminutor granulation respectively, is 190 DEG C at prilling temperature, and engine speed is under 100rpm condition, obtains the plastic matrix particle of each layer; (2) second time granulation: each layer plastic matrix particle puts into comminutor granulation respectively again with gained respectively by additive required in each layer raw material, and be 110 DEG C at prilling temperature, engine speed is under 50rpm condition, obtains the plastic pellet of each layer; (3) dry: each layer plastic pellet obtained is dried, makes the moisture content of the plastic pellet after oven dry be 0.1%; (4) extrusion molding: the plastic pellet after drying is put into extruder from the different conveying mouths of extruder, and through co-extrusion pressure extrusion molding, extruded velocity is 50m/min, and hauling speed is 10m/min, and extrusion temperature is 175 DEG C, obtains precursor; (5) described precursor is passed through cutting, obtain cutting body, cutting temperature is 180 DEG C; (6) described cutting body is carried out cold stretch, draft temperature is 35 DEG C, and draw speed is 12m/min, and after cold stretch, in draft temperature, insulation sizing 18min, obtains head product; (7) described head product is carried out print, filter core is installed, obtain finished product.
Embodiment 2:
A kind of pipette, comprise endonexine and extexine, endonexine take Mixing ratio by weight as the mixture of PS and the ABS of 3:10 is base-material, extexine with the mixture of PP and PVC for base-material, the plasticizer accounting for 10% of base-material gross weight and account for base-material gross weight 5%, particle diameter is the activated carbon granule of 30nm; The Mixing ratio by weight of PP and PVC is 10:5, and plasticizer is be that the methacrylate polymer of 2:4 and polyvinyl chloride form by weight ratio.
The production technology of this pipette comprises the following steps: (1) first time granulation: the plastic matrix of each layer is put into comminutor granulation respectively, is 160 DEG C at prilling temperature, and engine speed is under 90rpm condition, obtains the plastic matrix particle of each layer; (2) second time granulation: each layer plastic matrix particle puts into comminutor granulation respectively again with gained respectively by additive required in each layer raw material, and be 100 DEG C at prilling temperature, engine speed is under 60rpm condition, obtains the plastic pellet of each layer; (3) dry: each layer plastic pellet obtained is dried, makes the moisture content of the plastic pellet after oven dry be 0.2%; (4) extrusion molding: the plastic pellet after drying is put into extruder from the different conveying mouths of extruder, and through co-extrusion pressure extrusion molding, extruded velocity is 35m/min, and hauling speed is 16m/min, and extrusion temperature is 165 DEG C, obtains precursor; (5) described precursor is passed through cutting, obtain cutting body, cutting temperature is 120 DEG C; (6) described cutting body is carried out cold stretch, draft temperature is 40 DEG C, and draw speed is 13m/min, and after cold stretch, in draft temperature, insulation sizing 17min, obtains head product; (7) described head product is carried out print, filter core is installed, obtain finished product.
Embodiment 3:
A kind of pipette, comprise endonexine and extexine, endonexine take Mixing ratio by weight as the mixture of PS and the ABS of 2:6 is base-material, extexine with the mixture of PP and PVC for base-material, the plasticizer accounting for 12% of base-material gross weight and account for base-material gross weight 3%, particle diameter is the silica granule of 20nm; The Mixing ratio by weight of PP and PVC is 15:10, and plasticizer is be that the methacrylate polymer of 2:5 and polyvinyl chloride form by weight ratio.
The production technology of this pipette comprises the following steps: (1) first time granulation: the plastic matrix of each layer is put into comminutor granulation respectively, is 180 DEG C at prilling temperature, and engine speed is under 80rpm condition, obtains the plastic matrix particle of each layer; (2) second time granulation: each layer plastic matrix particle puts into comminutor granulation respectively again with gained respectively by additive required in each layer raw material, and be 110 DEG C at prilling temperature, engine speed is under 70rpm condition, obtains the plastic pellet of each layer; (3) dry: each layer plastic pellet obtained is dried, makes the moisture content of the plastic pellet after oven dry be 0.3%; (4) extrusion molding: the plastic pellet after drying is put into extruder from the different conveying mouths of extruder, and through co-extrusion pressure extrusion molding, extruded velocity is 40m/min, and hauling speed is 15m/min, and extrusion temperature is 170 DEG C, obtains precursor; (5) described precursor is passed through cutting, obtain cutting body, cutting temperature is 160 DEG C; (6) described cutting body is carried out cold stretch, draft temperature is 30 DEG C, and draw speed is 15m/min, and after cold stretch, in draft temperature, insulation sizing 15min, obtains head product; (7) described head product is carried out print, filter core is installed, obtain finished product.
Embodiment 4:
A kind of pipette, comprise endonexine and extexine, endonexine take Mixing ratio by weight as the mixture of PS and the ABS of 2:6 is base-material, extexine with the mixture of PP and PVC for base-material, the plasticizer accounting for 12% of base-material gross weight and account for base-material gross weight 3%, particle diameter is the silica granule of 20nm; The Mixing ratio by weight of PP and PVC is 13:8, and plasticizer is be that the methacrylate polymer of 2:5 and polyvinyl chloride form by weight ratio.
The production technology of this pipette comprises the following steps: (1) first time granulation: the plastic matrix of each layer is put into comminutor granulation respectively, is 170 DEG C at prilling temperature, and engine speed is under 85rpm condition, obtains the plastic matrix particle of each layer; (2) second time granulation: each layer plastic matrix particle puts into comminutor granulation respectively again with gained respectively by additive required in each layer raw material, and be 105 DEG C at prilling temperature, engine speed is under 50rpm condition, obtains the plastic pellet of each layer; (3) dry: each layer plastic pellet obtained is dried, makes the moisture content of the plastic pellet after oven dry be 0.4%; (4) extrusion molding: the plastic pellet after drying is put into extruder from the different conveying mouths of extruder, and through co-extrusion pressure extrusion molding, extruded velocity is 30m/min, and hauling speed is 10m/min, and extrusion temperature is 160 DEG C, obtains precursor; (5) described precursor is passed through cutting, obtain cutting body, cutting temperature is 150 DEG C; (6) described cutting body is carried out cold stretch, draft temperature is 30 DEG C, and draw speed is 10m/min, and after cold stretch, in draft temperature, insulation sizing 16min, obtains head product; (7) described head product is carried out print, filter core is installed, obtain finished product.
Embodiment 5:
A kind of pipette, comprise endonexine and extexine, endonexine take Mixing ratio by weight as the mixture of PS and the ABS of 3:8 is base-material, extexine take PVC as base-material, the plasticizer accounting for 15% of base-material gross weight and account for base-material gross weight 4%, particle diameter is the activated carbon granule of 15nm, plasticizer is be that the methacrylate polymer of 2:3 and polyvinyl chloride form by weight ratio.
The production technology of this pipette comprises the following steps: (1) first time granulation: the plastic matrix of each layer is put into comminutor granulation respectively, is 190 DEG C at prilling temperature, and engine speed is under 80rpm condition, obtains the plastic matrix particle of each layer; (2) second time granulation: each layer plastic matrix particle puts into comminutor granulation respectively again with gained respectively by additive required in each layer raw material, and be 100 DEG C at prilling temperature, engine speed is under 60rpm condition, obtains the plastic pellet of each layer; (3) dry: each layer plastic pellet obtained is dried, makes the moisture content of the plastic pellet after oven dry be 0.5%; (4) extrusion molding: the plastic pellet after drying is put into extruder from the different conveying mouths of extruder, and through co-extrusion pressure extrusion molding, extruded velocity is 50m/min, and hauling speed is 20m/min, and extrusion temperature is 180 DEG C, obtains precursor; (5) described precursor is passed through cutting, obtain cutting body, cutting temperature is 170 DEG C; (6) described cutting body is carried out cold stretch, draft temperature is 45 DEG C, and draw speed is 15m/min, and after cold stretch, in draft temperature, insulation sizing 20min, obtains head product; (7) described head product is carried out print, filter core is installed, obtain finished product.
Claims (10)
1. a pipette, is characterized in that: comprise endonexine and extexine, and described endonexine is with the mixture of PS and ABS for base-material, and described extexine is with the mixture of PP or PVC or PP and PVC for base-material, and the Mixing ratio by weight of described PS and ABS is 1-3:5-10.
2. a kind of pipette according to claim 1, is characterized in that: described extexine is with the mixture of PP and PVC for base-material, and the Mixing ratio by weight of described PP and PVC is 10-15:5-10.
3. a kind of pipette according to claim 1, is characterized in that: described extexine also comprises the plasticizer of the 10-15% accounting for described base-material gross weight, and described plasticizer is be that the methacrylate polymer of 2:3-5 and polyvinyl chloride form by weight ratio.
4. a kind of pipette according to claim 1, it is characterized in that: described extexine also comprises the particle of the 0.5-5% accounting for described base-material gross weight, the particle diameter of described particle is 10-30nm.
5. a kind of pipette according to claim 4, is characterized in that: described particle is silica granule or activated carbon granule.
6. the production technology of a kind of pipette as claimed in claim 1, it is characterized in that: comprise the following steps: (1) first time granulation: the plastic matrix of each layer is put into comminutor granulation respectively, be 160-190 DEG C at prilling temperature, engine speed is under 80-100rpm condition, obtains the plastic matrix particle of each layer; (2) second time granulation: each layer plastic matrix particle puts into comminutor granulation respectively again with gained respectively by additive required in each layer raw material, and be 100-110 DEG C at prilling temperature, engine speed is under 50-70rpm condition, obtains the plastic pellet of each layer; (3) dry: each layer plastic pellet obtained is dried, makes the moisture content of the plastic pellet after oven dry be 0.1-0.5%; (4) extrusion molding: the plastic pellet after drying is put into extruder from the different conveying mouths of extruder, through co-extrusion pressure extrusion molding, obtains precursor; (5) described precursor is passed through cutting, obtain cutting body, cutting temperature is 120-180 DEG C; (6) described cutting body is carried out cold stretch, obtain head product; (7) described head product is carried out print, filter core is installed, obtain finished product.
7. the production technology of a kind of pipette according to claim 6, it is characterized in that: the extruded velocity in described step (4) is 30-50m/min, hauling speed is 10-20m/min, and extrusion temperature is 160-180 DEG C.
8. the production technology of a kind of pipette according to claim 6, is characterized in that: in described step (6), the temperature of cold stretch is 30-50 DEG C, and draw speed is 10-15m/min.
9. the production technology of a kind of pipette according to claim 8, is characterized in that: in described step (6) after cold stretch, insulation sizing in described draft temperature.
10. the production technology of a kind of pipette according to claim 9, is characterized in that: described shaping time is 15-20min.
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| US10894253B2 (en) | 2015-06-08 | 2021-01-19 | Corning Incorporated | Pipette with improved readability and toughness |
Citations (8)
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| US4877585A (en) * | 1987-12-09 | 1989-10-31 | Brandeis University | Dilution pipette device |
| WO2001068258A1 (en) * | 2000-03-15 | 2001-09-20 | American Cyanamid Company | Pipette tip |
| CN201052656Y (en) * | 2007-04-20 | 2008-04-30 | 钟大钜 | Drawing and forming equipment for plastic pipet |
| CN101653986A (en) * | 2009-09-15 | 2010-02-24 | 袁建华 | Automatic stretching machine of mouthpiece of general polystyrene piette |
| CN202037848U (en) * | 2011-03-31 | 2011-11-16 | 袁建华 | Extruder for pipette |
| CN202638449U (en) * | 2012-06-16 | 2013-01-02 | 杭州金源生物技术有限公司 | Sealing liquid relief tip |
| CN102921482A (en) * | 2012-11-06 | 2013-02-13 | 无锡耐思生物科技有限公司 | Pipetting gun head structure with filter elements |
| CN103612389A (en) * | 2013-10-28 | 2014-03-05 | 浙江立博生物技术有限公司 | Special pipette production apparatus and production technology thereof |
-
2014
- 2014-08-14 CN CN201410399348.2A patent/CN104174447B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4877585A (en) * | 1987-12-09 | 1989-10-31 | Brandeis University | Dilution pipette device |
| WO2001068258A1 (en) * | 2000-03-15 | 2001-09-20 | American Cyanamid Company | Pipette tip |
| CN201052656Y (en) * | 2007-04-20 | 2008-04-30 | 钟大钜 | Drawing and forming equipment for plastic pipet |
| CN101653986A (en) * | 2009-09-15 | 2010-02-24 | 袁建华 | Automatic stretching machine of mouthpiece of general polystyrene piette |
| CN202037848U (en) * | 2011-03-31 | 2011-11-16 | 袁建华 | Extruder for pipette |
| CN202638449U (en) * | 2012-06-16 | 2013-01-02 | 杭州金源生物技术有限公司 | Sealing liquid relief tip |
| CN102921482A (en) * | 2012-11-06 | 2013-02-13 | 无锡耐思生物科技有限公司 | Pipetting gun head structure with filter elements |
| CN103612389A (en) * | 2013-10-28 | 2014-03-05 | 浙江立博生物技术有限公司 | Special pipette production apparatus and production technology thereof |
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Address after: 313220 Deqing County Province, Huzhou City, the town of bell hill road, No., No. 148 Patentee after: Zhejiang Sorfa Life Science Research Co., Ltd. Address before: 313220 Deqing County Province, Huzhou City, the town of bell hill road, No., No. 148 Patentee before: Zhejiang Sorfa Medical Plastic Co.,Ltd. |