CN109820520B - Method for manufacturing double-layer vacuum blood collection tube body - Google Patents
Method for manufacturing double-layer vacuum blood collection tube body Download PDFInfo
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- CN109820520B CN109820520B CN201910113490.9A CN201910113490A CN109820520B CN 109820520 B CN109820520 B CN 109820520B CN 201910113490 A CN201910113490 A CN 201910113490A CN 109820520 B CN109820520 B CN 109820520B
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Abstract
The invention discloses a method for manufacturing a double-layer vacuum blood collection tube body, which comprises the following steps: s1 preparing auxiliary tools for manufacturing the double-layer vacuum blood collection tube body, wherein the auxiliary tools comprise a sealable cavity, a placing jig and a special stamping die; s2, manufacturing a PET outer tube of the double-layer vacuum blood collection tube body, wherein the inner wall of the PET outer tube is provided with a limiting connecting part; s3, manufacturing a PP inner tube of the double-layer vacuum blood collection tube body, wherein the outer wall of the PP inner tube is provided with a press fit part in interference fit with the limiting connecting part; s4 is in the sealable cavity, the manufactured PET outer tube and the manufactured PP inner tube which form interference fit connection are pressed together by using the placing jig and the special stamping die to manufacture the double-layer vacuum blood collection tube body, and the sealable cavity provides a high-vacuum environment in the pressing process. The invention combines the advantages of two materials and manufactures the double-layer vacuum blood collection tube body with excellent performance.
Description
Technical Field
The invention relates to the field of manufacturing of blood collection tubes, in particular to a method for manufacturing a double-layer vacuum blood collection tube body.
Background
In the series of plastic vacuum blood collection tubes, an anticoagulant blood collection tube is prepared by adding 1: 9 sodium citrate in water for anticoagulant assay.
PET (polyethylene terephthalate) resin has a plurality of excellent characteristics, such as oil resistance, grease resistance, acid resistance, alkali resistance and most solvent resistance; the gas and water vapor permeability is low (the oxygen permeability is 77cc/m 2/day), and the gas barrier, water and oil properties are excellent; the transparency is high; the gamma irradiation resistance is excellent; has good glossiness, no toxicity, no odor and good sanitary safety, and can be directly used for food packaging. At present, the PET material is a tube body material of a global universal vacuum blood collection tube, but because macromolecules of the PET material contain hydrophilic hydroxyl groups, the PET material has strong water absorption and is easy to absorb water in a sodium citrate water solution to cause the concentration of the sodium citrate water solution to continuously rise, thereby influencing the result of blood test. According to empirical data of product use, single-layer PET tubes were used to make 1: 9, the total loss time of the water content of the sodium citrate aqueous solution is less than 8 months, and the gradual loss of the water content exceeds the allowable range of 10 percent within 2 months, so that the product fails.
PP (polypropylene) is a non-toxic, odorless and tasteless milky-white high-crystallization polymer, has good chemical stability, can be corroded by concentrated sulfuric acid and concentrated nitric acid, has stable chemical properties for other various chemical reagents, and does not react with most chemicals; it is particularly stable to water, with a water absorption of only 0.01% in water; PP (polypropylene) is not taken as a vacuum blood collection tube container alone, and has the defects of poor air tightness (gas barrier property), 2300-3100cc/m2/day oxygen transmission rate and incapability of realizing the performance of maintaining effective negative pressure of the vacuum blood collection tube for more than 10 months;
the finished vacuum blood collection tube is sterilized by terminal gamma rays or electron beams; the general PP (polypropylene) material is generally not resistant to irradiation, and the irradiation can break molecular chains of the PP (polypropylene), so that the product is yellow and crisp. At present, no PP (polypropylene) material resistant to gamma irradiation is produced in batches at home.
The double-layer vacuum blood collection tube on the market at present is in a product structure realized by adhering two layers of tube body tube walls through light curing glue; the product structure is realized by simultaneously plugging the pipe orifices of the two layers of pipe bodies by a step type plug column rubber plug; the product structure is realized by clamping the inner pipe by adding the inverted ridge lines on the inner wall of the outer pipe; the structure of these product designs presents the following problems:
in the three methods, when the double-layer tube is assembled, air between the gaps formed by the inner tube wall and the outer tube wall needs to be exhausted, otherwise, when the double-layer tube is combined, the air between the gaps formed by the inner tube wall and the outer tube wall generates pressure due to the combination pressure to push the inner tube outwards, so the three methods are designed with the exhaust grooves. The product structure is realized by adhering the tube walls of the two layers of tube bodies through the light-cured adhesive, and although the exhaust groove is blocked, the light-cured adhesive cannot prevent blood from coagulating due to small sharp corners or micropores; the product structure is realized by simultaneously plugging the pipe orifices of the two layers of pipe bodies by a stepped plug column rubber plug, and the risk of being pulled out together with the inner pipe when the cap plug is pulled out usually exists; the structure of the product is realized by clamping the inner tube by adding the inverted ridge line on the inner wall of the outer tube, when blood is reversely mixed with a sodium citrate aqueous solution in a test tube, the mixed solution of the blood and a medicament can permeate into a gap formed by the inner tube and the outer tube due to the siphoning action of the exhaust groove, the result of blood inspection is influenced, the cleanness of the product is ensured, and the risk that the cap plug and the inner tube are pulled out together when the cap plug is pulled out is also avoided; the double-layer plastic vacuum blood collection tube in the market is difficult to meet the requirements of hospitals at present.
The double-layer vacuum blood collection tube body which has the advantages of leakage prevention, inner tube separation prevention, excellent vacuum keeping and water retention performances, gamma or electron beam irradiation sterilization resistance, transparent material and hydrophobic inner surface of the tube body to prevent blood from hanging on the wall is manufactured, and the technical problem which needs to be solved in the field of blood inspection is always urgent.
Disclosure of Invention
The invention aims to provide a method for manufacturing a double-layer vacuum blood collection tube body, which reliably combines an outer tube produced by a PET (polyethylene terephthalate) material and an inner tube produced by a PP (polypropylene) material together to realize the manufacture of the double-layer vacuum blood collection tube body which has the advantages of leakage prevention, inner tube separation prevention, excellent vacuum maintaining and water retaining performances, gamma or electron beam irradiation sterilization resistance, transparent material and hydrophobic inner surface of the tube body to prevent blood from hanging on the wall.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a manufacturing method of a double-layer vacuum blood collection tube body is characterized by comprising the following steps:
(S1) preparing an auxiliary tool for manufacturing a double-layer vacuum blood collection tube body, wherein the auxiliary tool comprises a sealable cavity for providing an environment with enough vacuum degree, a placing jig for placing double-layer materials of the double-layer vacuum collection tube body, and a special stamping die for pressing and manufacturing the double-layer vacuum collection tube body;
(S2) manufacturing a PET outer tube of the double-layer vacuum blood collection tube body to enable the PET outer tube to achieve gas barrier property, gamma irradiation resistance, transparency and strength which meet the use requirements, and arranging a limiting connecting part on the inner wall of the PET outer tube;
(S3) manufacturing a PP inner tube of the double-layer vacuum blood collection tube body to enable the PP inner tube to reach the water resistance, the gamma irradiation resistance, the transparency and the strength which meet the use requirements, and arranging a press-fit part in interference fit with the limiting connecting part on the outer wall of the PP inner tube;
(S4) in the closable cavity, the manufactured PET outer tube and the manufactured PP inner tube which form interference fit connection are pressed together by using the placing jig and the special stamping die to manufacture the double-layer vacuum blood collection tube body, and the closable cavity provides a high-vacuum environment in the pressing process.
The step (S4) includes the steps of:
(S41) correspondingly arranging a placing jig and a special stamping die in the sealable cavity;
(S42) placing the PET outer pipe on a placing jig, and sleeving the PP inner pipe in the PET outer pipe;
(S43) vacuumizing the sealable cavity to-95 Kpa;
(S44) the special stamping die moves downwards to press the PET outer tube and the PP inner tube, the limiting connecting portion and the pressing portion are in interference fit, and the double-layer vacuum blood collection tube body is manufactured.
The limit connecting part in the step (S2) comprises an annular ridge line arranged near the pipe orifice of the inner wall of the PET outer pipe and an inclined plane arranged on the inner wall below the annular ridge line. The distance between the annular ridge line and the opening of the PET outer tube is 4.2mm, the height is 0.1mm, and the width is 0.05 mm.
The utility model discloses a PET outer tube, including PET outer tube, pressfitting portion, stepped ring chamfer, PET outer tube, pressfitting portion is for locating the stepped ring in the PP inner tube mouth of pipe outside, the stepped ring height is 2.5mm, and salient PP inner tube outer wall 0.15mm is equipped with stepped ring chamfer bottom the stepped ring, stepped ring chamfer diameter is 0.15mm, stepped ring outer wall inclined plane with PET outer tube inner wall inclined plane is corresponding, the interference numerical value of stepped ring and PET outer tube inner wall is about 0.12 mm.
Further, an annular ridge line is arranged near the opening of the inner wall of the PET outer pipe in the step S1, and when the pressing is completed, the stepped circular ring of the PP inner pipe is located below the annular ridge line.
Furthermore, the distance between the annular ridge line and the mouth of the PET outer tube is 4.2mm, the height is 0.1mm, and the width is 0.05 mm.
Further, the special stamping die in step S3 includes a top plate, a first fixing plate disposed at the bottom of the top plate, a second fixing plate disposed at the bottom of the first fixing plate, a cavity disposed in the first fixing plate, a feather spring whose top end is fixed at the top of the cavity, a first punch disposed in the second fixing plate, a light-weight spring disposed in the second fixing plate and connected to the top of the first punch, a step surface disposed at the bottom end of the first punch, a double-layer module disposed on the step surface, a punch hole passage penetrating through the top plate, the feather spring, the first fixing plate, the second fixing plate, the first punch, a second punch disposed in the punch hole passage, and a pressing plate disposed on the second punch in the cavity; the top of the pressure plate is connected with the feather amount spring.
Furthermore, the double-layer module comprises a first module which is matched with the inner diameter of the PET outer pipe and is arranged on the step surface and a second module which is matched with the inner diameter of the PP inner pipe and is arranged at the bottom of the first module, and the height of the first module is 4.2 mm; the second module is equipped with the chamfer, the second drift all passes first module and second module, second drift bottom with second module bottom distance is 7 mm.
Further, the PET outer tube is made of SK-370Y PP material of SK company of Korea.
Further, the spring force of the momentum spring 9 is greater than the friction force of the interference fit insertion of the PP inner tube 3 into the PET outer tube 2, but less than the spring force of the lightweight spring 10 on the top of the first punch 5.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the inner tube and the outer tube of the double-layer vacuum blood sampling tube are pressed together in a vacuum environment by arranging the closed cavity, so that the inherent air pressure interference of the traditional process cannot exist in the cavity formed between the inner tube wall and the outer tube wall during pressing, vacuum is formed, the air pressure in the cavity formed between the two layers of tubes is lower than the atmospheric pressure, the inner tube is stably positioned at a specified position under the action of the atmospheric pressure, the falling-off of the inner tube is prevented, and the situation that the inner tube and the inner tube are pulled out together during pulling out the cap plug is avoided.
(2) The special punching die moves downwards when the special punching die is used for punching, the second punch contacts the bottom of the inner tube, the PP inner tube is pushed into the outer tube to the bottom of the PET outer tube and then is stressed to stop moving, the special punching die continues to move downwards, the double-layer module on the first punch sequentially contacts the orifice plane of the PET outer tube and the orifice plane of the PP inner tube, the inner tube is just pressed below the annular ridge line of the PET outer tube, the inclined plane of the inner wall of the PET outer tube is in interference fit with the stepped ring of the PP inner tube, the punching is finished by utilizing the plasticity of the high polymer material, and the punching is tight and has good effect.
(3) The matching position of the inner tube and the outer tube is in interference fit, the external demoulding angle of the circular ring outside the tube opening of the inner tube is the same as the demoulding angle of the inner wall of the outer tube, the annular area matching is realized, the sealing is reliably realized, blood and solvent cannot permeate into a crack formed by the two layers of tubes, and the accuracy of blood detection is ensured.
(4) The invention integrates the advantages of two materials by arranging the outer tube made of PET material and the inner tube made of SK-370Y PP (polypropylene) material of Korean SK company; the SK-370Y PP (polypropylene) material of Korean SK company has good water resistance, hydrophobicity, gamma irradiation resistance, transparency and strength, solves the problems that domestic PP materials are not irradiation resistant and poor in transparency, and meanwhile, the good hydrophobicity enables the surface of the inner tube not to have blood wall hanging when contacting with blood, the water retention performance is excellent, and the PET (polyethylene terephthalate) material can play a role in preventing leakage, preventing the inner tube from separating and the like, and has excellent gas resistance, water resistance and oil resistance; high transparency and excellent gamma irradiation resistance.
Drawings
Fig. 1 is a schematic view of the beginning of the product pressing process of the present invention.
FIG. 2 is a view showing the structure of the outer tube of the double-walled test tube of the present invention.
FIG. 3 is a view showing the structure of the inner tube of the double layer test tube of the present invention.
FIG. 4 is a schematic diagram of a double-layered test tube according to the present invention.
Fig. 5 is a schematic diagram of an intermediate step in the pressing process of the present invention.
Fig. 6 is a schematic diagram illustrating the completion of the pressing process according to the present invention.
Wherein, the names corresponding to the reference numbers are:
1-placing a jig, 2-PET outer pipe, 3-PP inner pipe, 4-second punch, 5-first punch, 6-second fixing plate, 7-first fixing plate, 8-top plate, 9-feather spring, 10-light weight spring, 11-step surface, 12-first module, 13-second module, 14-first stroke, 15-second stroke, 16-annular ridge, 17-inner wall inclined surface of PET outer pipe body, 18-step ring, 19-step ring chamfer, 20-outer pipe orifice plane, 21-inner pipe orifice plane and 22-cavity gap.
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.
Examples
Referring to fig. 1, the method for manufacturing the double-layer evacuated blood collection tube body (S1) prepares an auxiliary tool for manufacturing the double-layer evacuated blood collection tube body, the auxiliary tool comprises a sealable cavity for providing an environment with sufficient vacuum degree, a placing jig 1 for placing the double-layer material of the double-layer evacuated blood collection tube body, and a special stamping die for pressing and manufacturing the double-layer evacuated blood collection tube body;
the special stamping die comprises a top plate 8, a first fixing plate 7 arranged at the bottom of the top plate 8, a second fixing plate 6 arranged at the bottom of the first fixing plate 7, a cavity arranged in the first fixing plate 7, a feather spring 9 fixed at the top end of the first fixing plate in the cavity, a first punch 5 arranged in the second fixing plate 6, a light spring 10 arranged in the second fixing plate 6 and connected with the top of the first punch 5, a step surface 11 arranged at the bottom end of the first punch 5, a double-layer module arranged on the step surface 11, a punch hole passage penetrating through the top plate 8, the feather spring 9, the first fixing plate 7, the second fixing plate 6 and the first punch 5, a second punch 4 arranged in the punch hole passage, and a pressing plate arranged on the second punch 4 in the cavity; the top of the pressure plate is connected with the feather amount spring 9. The strength of a feather spring D is greater than the friction force of the PP inner pipe body 3 inserted into the PET outer pipe body 2 in an interference fit manner, but is less than the strength of a light spring 10 on the top of the second punch 5; the double-layer module comprises a first module 12 which is matched with the inner diameter of the PET outer pipe body 2 and is arranged on the step surface 11, and a second module 13 which is matched with the inner diameter of the PP inner pipe body 3 and is arranged at the bottom of the first module 12, wherein the height of the first module 12 is 4.2 mm; the second punch 4 penetrates through the first module 12 and the second module 13, and the distance between the bottom end of the second punch 4 and the bottom of the second module is 7 mm. The spring force of the feather spring 9 is greater than the friction force of the PP inner tube 3 inserted into the PET outer tube 2 in an interference fit mode, but is smaller than the spring force of the light spring 10 on the top of the first punch 5.
The placing jig 1 comprises a fixed seat and a groove which is arranged on the fixed seat and corresponds to the PET outer tube.
(S2) manufacturing the PET outer tube 2 of the double-layer vacuum blood collection tube body to enable the PET outer tube to reach the gas barrier property, the gamma irradiation resistance, the transparency and the strength which meet the use requirements, and arranging a limiting connecting part on the inner wall of the PET outer tube 2; the PET outer tube referring to FIG. 2, it is made of PET (polyethylene terephthalate) material by high speed injection molding machine and mold to produce PET outer tube of double layer vacuum blood collection tube; the limiting connecting part comprises an annular ridge 16 arranged near the pipe orifice of the inner wall of the PET outer pipe 2 and an inclined plane 17 arranged on the inner wall below the annular ridge 16; an annular ridge 16 is designed at a distance of 4.2mm from the pipe orifice to the inner wall of the PET outer pipe 2, the height of the annular ridge 16 is 0.1mm, the annular ridge protrudes out of the inner wall of the PET outer pipe by 0.05mm, and the part of the annular ridge is enlarged and shown in a figure A.
(S3) manufacturing the PP inner tube 3 of the double-layer vacuum blood collection tube body to enable the PP inner tube to reach the water resistance, the gamma irradiation resistance, the transparency and the strength which meet the use requirements, and arranging a press-fit part in interference fit with the limiting connecting part on the outer wall of the PP inner tube 3; referring to fig. 3, a PP inner tube 3, which is manufactured by using SK-370Y PP (polypropylene) material of SK corporation of korea through a high speed injection molding machine and a mold, is required to achieve water resistance, hydrophobicity, gamma irradiation resistance, transparency and strength meeting the use requirements; the outer side of the mouth of the PP inner pipe 3 at the pressing part is provided with a stepped ring 18, the height of the stepped ring is 2.5mm, the stepped ring protrudes 0.15mm out of the outer wall of the PP inner pipe after the partial enlargement is shown as a graph B, and the demoulding angle of the stepped ring 18 is the same as the angle of the inner wall inclined plane 17 of the PET outer pipe; after the PP inner pipe 3 and the PET outer pipe 2 are assembled, the pipe orifice of the PP inner pipe 3 is just positioned below the annular ridge 16 of the outer pipe; in order to facilitate the assembly of the PP inner pipe 3 and the PET outer pipe 2, a step ring chamfer 19 with the diameter of 0.15mm is designed below a step ring 18 of the PP inner pipe 3; fig. 3 indicates the orifice plane 21 of the PP inner tube 3; the SK-370Y PP (polypropylene) material of SK corporation in korea, because of its hydrophobic property, does not cause blood wall-hanging on the inner surface of the PP inner tube 3 when it comes into contact with blood.
(S4) in the closable cavity, the manufactured PET outer tube and the manufactured PP inner tube which form interference fit connection are pressed together by using the placing jig and the special stamping die to manufacture the double-layer vacuum blood collection tube body, and the closable cavity provides a high-vacuum environment in the pressing process.
Referring to fig. 1, a special stamping die and a placing jig are correspondingly arranged in a sealable cavity, a PET outer tube is placed on the placing jig, and a PP inner tube is sleeved in the PET outer tube; and vacuumizing the sealable cavity to-95 Kpa.
Referring to fig. 1, 4 and 5, the inner and outer tubes are pressed together in the sealed cavity by a special stamping die, because the product is pressed together in a vacuum state, the cavity 22 formed by the inner and outer tube walls does not have the air pressure interference inherent in the conventional process, and the crack 22 is partially enlarged and is shown in fig. C; the sequence of its work is:
as shown in fig. 1, 5 and 6, the special punching die moves downwards, the second punch 4 contacts the bottom of the PP inner tube 3, and when the PP inner body 3 is pushed to the inner bottom of the PET outer tube 2, the force is stopped; the special punching die continues to move downwards, the chamfer 13 of the first punch 5 can guide the product to be vertical, the double-layer module of the first punch 5 presses the pipe orifice of the inner pipe and the outer pipe, the plane step 11 of the first punch 5 is in contact compaction with the pipe orifice plane 21 of the PP inner pipe 3, the special punching die continues to move downwards, the plane step 11 of the punch 5 is in contact compaction with the pipe orifice plane 20 of the PET outer pipe 2, the second module 13 presses the PET outer pipe from the inside of the PP inner pipe outwards, the first module 12 presses the pipe body of the PP inner pipe from top to bottom, and the pipe body 3 of the PP inner pipe is pressed below the annular ridge 16 of the PET outer pipe body 2; at this time, as shown in fig. 6, both the feather spring 9 and the light spring 10 are compressed, and the distances of movement thereof are stroke 15 and stroke 14;
the special punching die moves upwards, the light-weight spring 10 of the first punch 5 is loosened, and the pressure fails; the momentum spring 9 of the second punch 4 continuously applies force to the bottom of the PP inner tube 3, and the product is not moved; the special stamping die continues to move upwards, the feather spring 9 of the second punch 4 is loosened, the pressure fails, the product stays on the placing jig 1 of the pipe body, and the pressing operation is finished; because the product compounding is carried out in the vacuum environment, after the product is molded and taken out of the closed cavity, the air pressure in the cavity 22 formed between the two layers of pipes can be lower than the atmospheric pressure, the stepped ring 18 of the PP inner pipe is fixed under the annular ridge 16 under the action of the air pressure, and meanwhile, the stepped ring 18 is more closely attached to the inclined plane and is stably positioned at the specified position, so that the falling-off of the inner pipe is prevented, and the situation that the inner pipe is pulled out together with the cap plug when the cap plug is pulled out is avoided.
Referring to fig. 2, 3 and 4, the inner wall of the PET outer tube 2 is in interference fit with the outer wall of the PP inner tube body 3, and the interference fit positions are a stepped ring 18 of the inner tube and an inclined surface 17 of the inner wall of the PET outer tube body.
The method adopted by the invention utilizes the plasticity of high polymer materials to make the interference value of the outer diameter of the stepped ring 18 of the inner tube and the inclined plane 17 of the inner wall of the PET outer tube body be 0.12mm, the angles of the stepped ring 18 of the inner tube and the inclined plane 17 of the inner wall of the PET outer tube body of the outer tube are the same, the annular area coincidence is realized, the sealing is reliably realized, and blood and solvent cannot permeate into a crack formed by two layers of tubes; the pulling force F which can be borne by the inner tube of the assembled double-layer blood collection tube body is more than 100N; the medical blood sampling device has the advantages that the product is guaranteed to be not pulled out together with the inner tube when the cap plug is pulled out in the later hospital use process, and the risk that the blood sample is abandoned due to the fact that the inner tube is separated from the blood sample to be tested is avoided.
The fit position of the inner tube and the outer tube is interference fit, and the angle of the step ring 18 of the inner tube is the same as that of the inner wall inclined plane 17 of the outer tube, so that the annular area coincidence is realized, the sealing is reliably realized, blood and solvent cannot permeate into a crack formed by the two layers of tubes, and the accuracy of blood detection is ensured.
The product combined by the manufacturing method integrates the advantages of 2 materials, and successfully produces the double-layer vacuum blood collection tube body which has the advantages of leakage prevention, inner tube separation prevention, excellent vacuum keeping and water retention performances, gamma or electron beam irradiation sterilization resistance, transparent material and hydrophobic inner surface of the tube body to prevent blood from being hung on the wall.
The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or changes made within the spirit and scope of the main design of the present invention, which still conform to the technical problems of the present invention, should be included in the scope of the present invention.
Claims (8)
1. A method for manufacturing a double-layer vacuum blood collection tube body is characterized by comprising the following steps:
(S1) preparing an auxiliary tool for manufacturing the double-layer vacuum blood collection tube body, wherein the auxiliary tool comprises a sealable cavity for providing a vacuum degree environment of-90 Kpa to-100 Kpa, a placing jig (1) for placing a double-layer material of the double-layer vacuum collection tube body, and a special stamping die for pressing and manufacturing the double-layer vacuum collection tube body; the special punching die comprises a top plate (8), a first fixing plate (7) arranged at the bottom of the top plate (8), a second fixing plate (6) arranged at the bottom of the first fixing plate (7), a cavity arranged in the first fixing plate (7), a feather amount spring (9) fixed at the top end of the first fixing plate in the cavity, a first punch (5) arranged in the second fixing plate (6), a light weight spring (10) arranged in the second fixing plate (6) and connected with the top of the first punch (5), a step surface (11) arranged at the bottom end of the first punch (5), a double-layer module arranged on the step surface (11), a punch hole passage penetrating through the top plate (8), the feather amount spring (9), the first fixing plate (7), the second fixing plate (6) and the first punch (5), and a second punch (4) arranged in the punch hole passage, a pressing plate is arranged on the second punch (4) positioned in the cavity; the top of the pressure plate is connected with the feather amount spring (9);
(S2) producing a PET outer tube (2) of the double-layer vacuum blood collection tube by using a PET material through a high-speed injection molding machine and a mould, wherein the inner wall of the PET outer tube is provided with a limit connecting part;
(S3) producing a PP inner tube of the double-layer vacuum blood collection tube by using SK-370Y PP material of Korean SK company through a high-speed injection molding machine and a mould, wherein the outer wall of the PP inner tube is provided with a press fit part in interference fit with the limit connection part;
(S4) in the closable cavity, the tool (1) and the special stamping die are used for placing to connect the manufactured PET outer tube (2) and the PP inner tube (3) in an interference fit manner, the PET outer tube and the PP inner tube are pressed to form the double-layer vacuum blood collection tube body, and the closable cavity provides a high-vacuum environment in the pressing process.
2. The method for manufacturing a double-layer vacuum blood collection tube body according to claim 1, wherein the step (S4) comprises the steps of:
(S41) correspondingly arranging the placing jig and the special stamping die in the closable cavity;
(S42) placing the PET outer pipe on a placing jig, and sleeving the PP inner pipe in the PET outer pipe;
(S43) vacuumizing the sealable cavity to-90 Kpa to-100 Kpa;
(S44) the special punching die moves downwards to press the PET outer tube and the PP inner tube, the limiting connecting part and the pressing part are in interference fit, and a cavity gap (22) formed by the PET outer tube and the PP inner tube completes the manufacture of the double-layer vacuum blood collection tube body.
3. The method of claim 2, wherein the limit connection portion in the step (S2) comprises an annular ridge (16) formed near the mouth of the inner wall of the PET outer tube (2) and a slope (17) formed on the inner wall below the annular ridge (16), and the slope (17) is inclined inward from the inner wall of the PET outer tube.
4. The method for manufacturing the double-layer evacuated blood collection tube body according to claim 3, wherein the annular ridge (16) is 4.2mm away from the mouth of the PET outer tube (2), the height is 0.1mm, and the width is 0.05 mm.
5. The method for manufacturing a double-layer evacuated blood collection tube body according to claim 4, wherein the pressing part is a stepped ring (18) provided outside the mouth of the PP inner tube (3).
6. The manufacturing method of the double-layer vacuum blood collection tube body according to claim 5, wherein the height of the stepped ring (18) is 2.5mm, the outer wall of the PP inner tube (3) protrudes by 0.15mm, a stepped ring chamfer (19) is arranged at the bottom of the stepped ring (18), the diameter of the stepped ring chamfer (19) is 0.15mm, the inclined plane of the outer wall of the stepped ring (18) corresponds to the inclined plane of the inner wall of the PET outer tube (2), interference fit is generated between the outer wall of the stepped ring and the inclined plane of the inner wall of the PET outer tube, and the interference value generated between the stepped ring (18) and the inner wall of the PET outer tube (2) is 0.12 mm.
7. The method for manufacturing the double-layer evacuated blood collection tube body according to claim 6, wherein the double-layer module comprises a first module (12) matched with the inner diameter of the PET outer tube (2) and arranged on the step surface (11) and a second module (13) matched with the inner diameter of the PP inner tube (3) and arranged at the bottom of the first module (12), and the height of the first module (12) is 4.2 mm; second module (13) are equipped with the chamfer, second drift (4) all pass first module (12) and second module (13), second drift (4) bottom with second module bottom distance is 7 mm.
8. The method of claim 7, wherein the spring force of the feather spring (9) is greater than the friction force of the PP inner tube (3) inserted into the PET outer tube (2) in an interference fit manner, but less than the spring force of the lightweight spring (10) at the top of the first punch (5).
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| CN109820520A (en) | 2019-05-31 |
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