阅读说明：本技术 一种低温贴合骨条及其生产工艺和应用 (Low-temperature laminating bone strip and production process and application thereof ) 是由 龚立锋 于 2020-05-26 设计创作，主要内容包括：本发明公开了一种低温贴合骨条及其生产工艺和应用。所述骨条的原料包括下述重量百分比的组分：非线性低密度聚乙烯20％-50％,线性低密度聚乙烯5％-20％,一类乙烯辛烯共聚物10％-30％,二类乙烯辛烯共聚物5％-15％,低压高密度聚乙烯1％-15％。本发明对原材料进行改良,所述的低温贴合骨条的密封性得到增强,实现不漏水、不渗水；进一步的,骨条的韧性得到增强,使其与自封袋的薄膜贴合不容易发生断裂,骨条外观更加笔直,降低了骨条的废品率和不合格品率。(The invention discloses a low-temperature laminating bone strip and a production process and application thereof. The raw materials of the bone strip comprise the following components in percentage by weight: 20-50% of nonlinear low-density polyethylene, 5-20% of linear low-density polyethylene, 10-30% of one-class ethylene-octene copolymer, 5-15% of two-class ethylene-octene copolymer and 1-15% of low-pressure high-density polyethylene. The invention improves the raw materials, the sealing performance of the low-temperature joint bone strip is enhanced, and no water leakage or water seepage is realized; furthermore, the toughness of the bone strips is enhanced, so that the bone strips are not easy to break when being attached to the film of the self-sealing bag, the appearance of the bone strips is straighter, and the rejection rate of the bone strips are reduced.)

1. The low-temperature attaching bone strip is characterized in that the raw materials of the bone strip comprise the following components in percentage by weight: 20-50% of nonlinear low-density polyethylene, 5-20% of linear low-density polyethylene, 10-30% of one-class ethylene-octene copolymer, 5-15% of two-class ethylene-octene copolymer and 1-15% of low-pressure high-density polyethylene.

2. The low-temperature-bonding bone strip according to claim 1, wherein the raw materials of the bone strip comprise the following components in percentage by weight: 42.84-46.68% of nonlinear low-density polyethylene, 13.33-14.29% of linear low-density polyethylene, 13.33-14.29% of one-class ethylene-octene copolymer, 13.33-14.29% of two-class ethylene-octene copolymer and 13.33-14.29% of low-pressure high-density polyethylene.

3. A sealed bone strip bag comprising the cryogenically bonded bone strip, bone strip leaf, film of claim 1.

4. The bone strip sealing bag of claim 4, wherein the raw materials of the bone strip leaves comprise the following components by weight percent: 40-60% of nonlinear low-density polyethylene, 10-20% of linear low-density polyethylene and 20-40% of high-performance polymer polyethylene.

5. The bone strip sealing bag of claim 4, wherein the raw materials of the bone strip leaves comprise the following components by weight percent: 50% of nonlinear low-density polyethylene, 16.67% of linear low-density polyethylene and 33.33% of high-performance polymer polyethylene.

6. The bone strip sealing bag according to claim 4, wherein the raw material of the film comprises the following components by weight percent: 20-50% of nonlinear low-density polyethylene, 40-65% of linear low-density polyethylene and 10-20% of high-performance polymer polyethylene.

7. The bone strip sealing bag according to claim 4, wherein the raw material of the film comprises the following components by weight percent: 30% of nonlinear low-density polyethylene, 57.5% of linear low-density polyethylene and 12.5% of high-performance polymer polyethylene.

8. The process for producing a low-temperature conformable bone strip of claim 1, comprising the steps of:

step S1, weighing the raw materials according to the following weight percentage: 20-50% of nonlinear low-density polyethylene, 5-20% of linear low-density polyethylene, 10-30% of one-class ethylene-octene copolymer, 5-15% of two-class ethylene-octene copolymer and 1-15% of low-pressure high-density polyethylene;

step S2, placing the raw materials in a stirrer, and stirring at a constant speed to uniformly mix the raw materials to obtain a mixture;

step S3, sucking the mixture into an extruder by using an automatic suction machine, heating and extruding the mixture in the extruder to form a linear melt;

step S4, cooling and shaping the linear melt in a water tank to generate a bone strip primary shape;

and step S5, restoring the bone strip primary form to generate a bone strip, and buckling the bone strip by using a chain combining machine.

9. The process for producing a low-temperature bonded bone strip according to claim 8, wherein in step S2, screw a corresponds to the raw material composition of the bone strip of claim 1, screw B corresponds to the non-linear low-density polyethylene and the linear low-density polyethylene in the raw material composition of the leaf of the bone strip of claim 4, and screw C corresponds to the high-performance polymer polyethylene in the raw material composition of the leaf of the bone strip of claim 4, the raw materials are placed in a blender and blended at a constant speed to uniformly blend the raw materials to obtain a mixture.

10. Use of the cryogenically conformable bone strip of claim 1 to prepare a sealed pouch.

Technical Field

The invention belongs to the technical field of plastic production and manufacturing, and particularly relates to a low-temperature attaching bone strip and a production process and application thereof.

Background

The self-sealing bag is applied to various fields, is used for sealing objects, prevents the sealed objects from being subjected to dust and moisture, is sealed by common bone strips at a sealing part, and ensures the sealing reliability.

The components of the existing bone strip raw material are non-linear low-density polyethylene with a melt index of 5g/10min, linear low-density polyethylene with a melt index of 2g/10min and ethylene octene copolymer with a melt index of 5g/10min, and the generated bone strip has the following defects: (1) the bone strips are soft, and the test value of the transverse tension value cannot reach the standard of a client; (2) the sealing performance does not reach the standard, and occasionally, the condition of water leakage or water seepage of bone strips occurs; (3) the toughness of the joint part of the bone strips is not good enough, and the self-sealing bag is easy to tear when being thermally jointed in the manufacturing process, so that the self-sealing bag is unusable; (4) the bone strips have more defects, high rejection rate and defective product rate and low qualified rate of finished products.

Therefore, a bone strip production process is urgently needed to be sought, and the technical problems of insufficient bone strip hardness, poor ductility, poor sealing performance, low qualification rate and the like in the prior art are solved.

Disclosure of Invention

The invention provides a low-temperature bonding bone strip and a production process and application thereof, aiming at the technical problems of insufficient bone strip hardness, poor ductility, poor sealing property, low qualification rate and the like in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that:

in a first aspect, the invention provides a low-temperature fitting bone strip, which comprises the following raw materials in percentage by weight: 20-50% of nonlinear low-density polyethylene, 5-20% of linear low-density polyethylene, 10-30% of one-class ethylene-octene copolymer, 5-15% of two-class ethylene-octene copolymer and 1-15% of low-pressure high-density polyethylene.

In another preferred embodiment, the invention provides a low-temperature fitting bone strip, which comprises the following raw materials in percentage by weight: 42.84-46.68% of nonlinear low-density polyethylene, 13.33-14.29% of linear low-density polyethylene, 13.33-14.29% of one-class ethylene-octene copolymer, 13.33-14.29% of two-class ethylene-octene copolymer and 13.33-14.29% of low-pressure high-density polyethylene.

Preferably, the raw materials of the bone strip comprise the following components in percentage by weight: 30% of nonlinear low-density polyethylene, 10% of linear low-density polyethylene, 20% of first-class ethylene-octene copolymer, 10% of second-class ethylene-octene copolymer and 10% of low-pressure high-density polyethylene.

Preferably, the density of the nonlinear low density polyethylene is 0.921g/m³The melt index is 5g/10 min.

Preferably, the linear low density polyethylene has a density of 0.918g/m³The melt index is 2g/10 min.

Preferably, the density of the ethylene octene copolymer is 0.94g/m³The melt index was 0.9g/10 min.

Preferably, the density of the second type of ethylene octene copolymer is 0.936g/m³The melt index was 4.5g/10 min.

Preferably, the low pressure high density polyethylene has a density of 0.961g/m³The melt index was 0.7g/10 min.

Preferably, the non-linear low density polyethylene has a designation of C150Y.

Preferably, the linear low density polyethylene has a grade of 218W.

Preferably, the ethylene octene copolymer of the class has a designation of 4009.

Preferably, the second type ethylene octene copolymer has a brand number of 4536.

Preferably, the low-pressure high-density polyethylene is H108 or F04660.

Preferably, the rib structure comprises a first clip chain 100 and a second clip chain 200 which can be fastened to each other, the first clip chain 100 comprises a first guide portion 110, a first fastening portion 120 and a first abutting portion 130 which are connected in sequence, and the second clip chain 200 comprises a second guide portion 210, a second fastening portion 220 and a second abutting portion 230 which are connected in sequence.

Preferably, the first guide part 110 and the second guide part 210 are each formed to have a predetermined shape, thickness and height, respectively, by ultrasonic welding, and the predetermined shape, thickness and height portions of the first guide part 110 and the second guide part 210 serve to prevent the reverse-winding deformation thereof.

Preferably, the first fastening part 120 extends towards the second fastening part 220 to form a hook a121 and a hook B122, respectively, and the second fastening part 220 extends towards the first fastening part 120 to form a hook C221 and a hook D222, respectively.

In a second aspect, the present invention provides a sealed bone strip bag comprising the cryogenically conformed bone strips, bone strip leaves, and film of claim 1.

Preferably, the raw materials of the bone strip leaves comprise the following components in percentage by weight: 40-60% of nonlinear low-density polyethylene, 10-20% of linear low-density polyethylene and 20-40% of high-performance polymer polyethylene.

Preferably, the raw materials of the bone strip leaves comprise the following components in percentage by weight: 50% of nonlinear low-density polyethylene, 16.67% of linear low-density polyethylene and 33.33% of high-performance polymer polyethylene.

Preferably, the density of the nonlinear low density polyethylene is 0.921g/m³The melt index is 5g/10 min.

Preferably, the linear low density polyethylene has a density of 0.918g/m³The melt index is 2g/10 min.

Preferably, the high performance polymer polyethylene has a density of 0.912g/m³The melt index is 2g/10 min.

Preferably, the non-linear low density polyethylene has a designation of C150Y.

Preferably, the linear low density polyethylene has a grade of 218W.

Preferably, the high performance polymer polyethylene is grade 2012.

Preferably, the raw materials of the film comprise the following components in percentage by weight: 20-50% of nonlinear low-density polyethylene, 40-65% of linear low-density polyethylene and 10-20% of high-performance polymer polyethylene.

Preferably, the raw materials of the film comprise the following components in percentage by weight: 30% of nonlinear low-density polyethylene, 57.5% of linear low-density polyethylene and 12.5% of high-performance polymer polyethylene.

Preferably, the density of the nonlinear low density polyethylene is 0.921g/m³The melt index is 5g/10 min.

Preferably, the linear low density polyethylene has a density of 0.918g/m³The melt index is 2g/10 min.

Preferably, the high performance polymer polyethylene has a density of 0.912g/m³The melt index is 2g/10 min.

Preferably, the non-linear low density polyethylene has a designation of C150Y.

Preferably, the linear low density polyethylene has a grade of 218W.

Preferably, the high performance polymer polyethylene has a grade of 2018A.

Preferably, the rib structure comprises a first clip chain 100 and a second clip chain 200 which can be fastened to each other, the first clip chain 100 comprises a first guide portion 110, a first fastening portion 120 and a first abutting portion 130 which are connected in sequence, and the second clip chain 200 comprises a second guide portion 210, a second fastening portion 220 and a second abutting portion 230 which are connected in sequence.

Preferably, the first guide part 110 and the second guide part 210 are each formed to have a predetermined shape, thickness and height, respectively, by ultrasonic welding, and the predetermined shape, thickness and height portions of the first guide part 110 and the second guide part 210 serve to prevent the reverse-winding deformation thereof.

Preferably, the first fastening part 120 extends towards the second fastening part 220 to form a hook a121 and a hook B122, respectively, and the second fastening part 220 extends towards the first fastening part 120 to form a hook C221 and a hook D222, respectively.

In a third aspect, the invention provides a production process of a low-temperature fitting bone strip, which comprises the following steps: step S1, weighing the raw materials according to the following weight percentage: 20-50% of nonlinear low-density polyethylene, 5-20% of linear low-density polyethylene, 10-30% of one-class ethylene-octene copolymer, 5-15% of two-class ethylene-octene copolymer and 1-15% of low-pressure high-density polyethylene; step S2, placing the raw materials in a stirrer, and stirring at a constant speed to uniformly mix the raw materials to obtain a mixture; step S3, sucking the mixture into an extruder by using an automatic suction machine, heating and extruding the mixture in the extruder to form a linear melt; step S4, cooling and shaping the linear melt in a water tank to generate a bone strip primary shape; and step S5, restoring the bone strip primary form to generate a bone strip, and buckling the bone strip by using a chain combining machine.

In another preferred embodiment, the invention provides a process for producing a low-temperature conformable bone strip, comprising the steps of: step S1, weighing the raw materials according to the following weight percentage: 42.84-46.68% of nonlinear low-density polyethylene, 13.33-14.29% of linear low-density polyethylene, 13.33-14.29% of one-class ethylene-octene copolymer, 13.33-14.29% of two-class ethylene-octene copolymer and 13.33-14.29% of low-pressure high-density polyethylene; step S2, placing the raw materials in a stirrer, and stirring at a constant speed to uniformly mix the raw materials to obtain a mixture; step S3, sucking the mixture into an extruder by using an automatic suction machine, heating and extruding the mixture in the extruder to form a linear melt; step S4, cooling and shaping the linear melt in a water tank to generate a bone strip primary shape; and step S5, restoring the bone strip primary form to generate a bone strip, and buckling the bone strip by using a chain combining machine.

In the above-mentioned bone strip production process of the present invention, the step S2 includes: step S21, judging whether the moisture content of the raw material is lower than the preset minimum moisture content, if so, executing step S22, and if not, executing step S23; step S22, placing the raw materials in a stirrer, and stirring at a constant speed for 25-30 minutes to uniformly mix the raw materials to obtain a mixture; and step S23, placing the raw materials in a stirrer, and uniformly stirring for 45-60 minutes at a constant speed of 60-80 ℃ to uniformly mix the mixture to obtain a mixture.

In the above-mentioned bone strip production process of the present invention, the step S5 includes: step S51, judging whether the outdoor temperature is lower than 20 ℃, if not, executing step S52; if yes, go to step S53; step S52, placing the bone strip prototype indoors for 1 hour to generate bone strips, and fastening the bone strips by using a chain combining machine; and step S53, placing the bone strip prototype in a sealed space with the temperature of more than 20 ℃ for more than 3 hours to generate bone strips, and fastening the bone strips by using a chain combining machine.

In the above-mentioned production process of the bone strip of the present invention, in the step S3, the temperature in the extruder is 150 ℃ to 205 ℃, the temperature is divided into 6 temperature zones, the temperature in the first zone is 150 ℃, the temperature in the second zone is 150 ℃ to 161 ℃, the temperature in the third zone is 161 ℃ to 172 ℃, the temperature in the fourth zone is 172 ℃ to 183 ℃, the temperature in the fifth zone is 183 ℃ to 194 ℃, and the temperature in the sixth zone is 194 ℃ to 205 ℃.

In the above-mentioned bone strip production process of the present invention, the density of the non-linear low density polyethylene is 0.921g/m3, the density of the linear low density polyethylene is 0.918g/m 3, the density of the first ethylene octene copolymer is 0.94g/m 3, the density of the second ethylene octene copolymer is 0.936g/m 3, and the density of the low pressure high density polyethylene is 0.961g/m 3.

In the production process of the bone strip, the melt index of the nonlinear low-density polyethylene is 5g/10min, the melt index of the linear low-density polyethylene is 2g/10min, the melt index of the first-class ethylene-octene copolymer is 0.9g/10min, the melt index of the second-class ethylene-octene copolymer is 4.5g/10min, and the melt index of the low-pressure high-density polyethylene is 0.7g/10 min.

In the above-mentioned production process of the bone strip of the present invention, the speed of extruding the thread-like melt by the extruder in the step S3 is 45 to 50 m/min.

In the above-mentioned bone strip production process of the present invention, the temperature of the cooling water in the water tank of step S4 is 28 to 30 ℃.

In the above-mentioned bone strip production process of the present invention, the raw material in step S1 may further include 2% to 2.5% of color masterbatch for making the bone strip exhibit different colors.

In the above-mentioned bone strip production process of the present invention, the capacity of the mixer is greater than the total weight of the raw materials.

Preferably, in step S2, screw a corresponds to the raw material composition of the bone strip of claim 1, screw B corresponds to the non-linear low density polyethylene and the linear low density polyethylene in the raw material composition of the leaf of the bone strip of claim 4, screw C corresponds to the high performance polymer polyethylene in the raw material composition of the leaf of the bone strip of claim 4, the raw materials are placed in a blender and blended at a constant speed to mix the raw materials uniformly, so as to obtain a mixture.

Preferably, the material of the screw C is coated on the outer side of the molded material of the screw B through a template runner.

In another preferred embodiment, the invention provides a production process of a low-temperature fitting bone strip, which is a production process of a three-screw bone strip extruder:

step S1: and (5) drying the raw materials. Conditionally, a mixer with a drying function can be used for mixing and drying;

step S2: respectively stirring the mixed raw materials according to the raw material formulas corresponding to the screws A, B and C;

step S3: sucking the mixture into the material barrels of the corresponding bone strip extruders by using an automatic material sucking machine, heating the mixture in the extruders, and extruding the mixture by using a screw to form linear melts;

step S4: the linear melt passes through respective flow passages in the template and is cooled and shaped in a water tank to generate a bone strip prototype;

step S5: and reducing the bone strip prototype to generate bone strips, and buckling the bone strips by using a chain combining machine.

In a fourth aspect, the present invention provides the use of a low temperature conformable bone strip for the preparation of a sealed pouch.

The technical scheme provided by the invention has the beneficial effects that: aiming at the technical problems of insufficient bone strip hardness, poor ductility, poor sealing performance, low qualification rate and the like in the prior art, the invention provides a bone strip production process, which hardens bone strips by improving a bone strip formula, increases the transverse and longitudinal tension values of the bone strips and achieves the purpose of safe use; after the bone strips are broken, crisp sound can be generated to remind the user of paying attention; the sealing performance of the bone strip is enhanced after the formula is improved, and no water leakage or water seepage is realized; furthermore, the toughness of the bone strips is enhanced, so that the bone strips are not easy to break when being bonded with the film of the self-sealing bag, the rejection rate and the rejection rate of the bone strips are reduced, and the quality of the bone strips and the film after being bonded at high temperature is improved. The low-temperature attaching bone strip disclosed by the invention has the advantages that on the premise of ensuring that the tension of the sealing bag is not influenced, the heat attaching temperature of the bone strip and the film is reduced as much as possible, the shrinkage rate of the film after heat attaching is reduced, and the attached pocket bone strip is straight in appearance.

Drawings

FIG. 1 is a flow chart of a bone strip production process according to an embodiment of the present invention;

FIG. 2 is a flowchart of a step S2 according to an embodiment of the present invention;

FIG. 3 is a flowchart of a step S5 according to an embodiment of the present invention;

FIG. 4 is a diagram illustrating an effect of a bone strip produced by a bone strip production process according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a bone strip produced by the bone strip production process flow provided by the embodiment of the invention.

Detailed Description

In order to solve the technical problems of insufficient bone strip hardness, poor sealing property, low qualification rate and the like in the prior art, the invention aims to provide a bone strip production process, which has the core idea that: the bone strip is hardened by improving the formula of the bone strip, the transverse and longitudinal tension values of the bone strip are increased, and the purpose of safe use is achieved; after the bone strips are broken, crisp sound can be generated to remind the user of paying attention; the sealing performance of the bone strip is enhanced after the formula is improved, and no water leakage or water seepage is realized; furthermore, the toughness of the bone strips is enhanced, so that the bone strips are not easy to break when being bonded with the film of the self-sealing bag, the rejection rate and the rejection rate of the bone strips are reduced, and the quality of the bone strips and the film after being bonded at high temperature is improved.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.