Protective plastic pin

Abstract

The invention discloses a protective plastic pin, and relates to the field of plastic pins, the protective plastic pin comprises the following raw materials by weight: 60-75 parts of nylon or polypropylene, 20-35 parts of a nucleating agent, 2-10 parts of calcium carbonate powder and 1-20 parts of low density polyethylene; according to the protective plastic pin, the fracture elongation rate is reduced while the hardness is maintained, so that the protective plastic pin is convenient to disassemble under the conditions of normal striking and fabric buckling, a fabric / product is prevented from being damaged in the disassembling process, the fracture elongation rate is reduced while the toughness is maintained, and the service life of the product is prolonged. The protective plastic pin is broken at the joint of the extension line part and the single-side cylinder or sheet-shaped part during disassembly, the position of the breaking point can be accurately controlled during disassembly of the plastic pin, the problems of snagging, damage and the like caused by the fact that a traditional plastic pin easily penetrates through fabric are solved, and therefore the integrity and attractiveness of fabric products are effectively protected.

Description

Technical Field

[0001] The invention relates to plastic glue needle technology, in particular to a protective plastic glue needle. Background Art

[0002] Plastic glue needles are widely used in the field of labeling and fixing of clothing, textiles and other products. The traditional glue needle design shape is a single-sided cylinder (cylinder diameter is 0.6mm / 0.8mm / 1mm), and the other side is a sheet-shaped part with a long side greater than or equal to 4mm. The two are connected by a plastic wire (extension wire) with a diameter of 0.35mm to 0.55mm. The main purpose of the single-sided cylinder is to use tools to hit it through the fabric or product, and the main purpose of the sheet-shaped part is to prevent the tag and fabric from falling off.

[0003] Currently, the plastic needles on the market are very strong, which makes the products used extremely weak. When the plastic needle is subjected to the force of disassembling, the plastic needle cylinder can easily penetrate the fabric and objects, causing damage to the product, making the product unable to be used normally or damaged, resulting in product snags, breakage, etc. Although traditional plastic needles have certain wear resistance and toughness, they perform poorly in rigidity and fracture control, and it is difficult to meet the market demand for high-quality protective plastic plastic needles. Summary of the invention

[0004] The purpose of the present invention is to provide a protective plastic needle to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical scheme: a protective plastic needle, wherein the raw materials thereof are proportioned by weight as follows: 60 to 75 parts of nylon or polypropylene, 20 to 35 parts of nucleating agent, 2 to 10 parts of calcium carbonate powder and 1 to 20 parts of low-density polyethylene.

[0006] Furthermore, the preparation method of the protective plastic needle comprises the following steps:

[0007] S1. Prepare nylon or polypropylene, a nucleating agent, calcium carbonate powder and low-density polyethylene as raw materials, with nylon or polypropylene as the main raw material, and take 60 to 75 parts by weight;

[0008] S2, adding 20 to 35 parts by weight of a nucleating agent, 2 to 10 parts by weight of calcium carbonate powder and 1 to 20 parts by weight of low-density polyethylene as a modifier and filler to the main raw materials, and mixing them uniformly;

[0009] S3, feeding the raw materials uniformly mixed in step S2 into a twin-screw extruder for melt mixing and granulation to obtain modified plastic particles;

[0010] S4. The modified plastic particles obtained in step S3 are fed into an injection molding machine, and a protective plastic needle is prepared through an injection molding process.

[0011] Furthermore, in step S3, the processing temperature of the twin-screw extruder is set at 160°C to 200°C.

[0012] Furthermore, step S2 also includes a pretreatment step for the raw materials: drying the nylon or polypropylene at 80° C. to 100° C. for 2 to 4 hours.

[0013] Compared with the prior art, the protective plastic needle provided by the present invention can reduce its elongation at break while maintaining hardness, and can be easily disassembled without damaging the fabric / product during the disassembly process under normal striking and fastening of the fabric. It can also reduce the elongation at break while maintaining toughness. When disassembling, the protective plastic needle breaks at the connection between the extension line part and the unilateral cylinder or the sheet-shaped part.

[0014] The modified plastic particles are melted and mixed evenly in the twin-screw extruder, and the processing temperature is controlled within an appropriate range, which ensures the good fluidity of the material and the quality of injection molding, which not only improves production efficiency, but also reduces product defects and improves the overall quality of the product;

[0015] The glue needle can accurately control the breaking point during disassembly, avoiding problems such as snagging and damage caused by traditional glue needles that easily penetrate the fabric, thereby effectively protecting the integrity and aesthetics of the fabric product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 A flow chart of the preparation process of the protective plastic needle provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] Embodiment 1: Protective plastic needle, the raw materials thereof are mixed in the following proportions by weight: 60-75 parts of nylon or polypropylene, 20-35 parts of nucleating agent, 2-10 parts of calcium carbonate powder and 1-20 parts of low-density polyethylene.

[0020] Nylon and polypropylene (PP) are both common thermoplastics with good mechanical strength, wear resistance, chemical corrosion resistance and certain thermal stability. In protective plastic needles, they are the main matrix materials, providing the basic physical properties and structural strength of the product. Nylon usually has higher wear resistance and toughness, while polypropylene is known for its lower density and cost-effectiveness. According to the needs of specific application scenarios, you can choose a suitable ratio or use one of the materials alone;

[0021] In the protective plastic needle, the addition of the nucleating agent helps to improve the transparency, rigidity and toughness of the protective plastic needle, and helps to improve the overall performance of the protective plastic needle, such as impact resistance, heat resistance and dimensional stability;

[0022] Adding calcium carbonate powder can improve the processing performance and increase the rigidity and hardness of the protective plastic needle while maintaining the performance of the protective plastic needle, effectively controlling the cost. In addition, it can also improve the thermal stability and flame retardancy of the protective plastic needle.

[0023] The addition of low-density polyethylene can improve the product's flexibility, impact resistance and processing fluidity. Low-density polyethylene also has good chemical stability and resistance to environmental stress cracking, which helps to extend the service life of the protective plastic needle.

[0024] For example 2, please refer to Figure 1 The preparation method of the protective plastic needle comprises the following steps:

[0025] S1. Prepare nylon or polypropylene, a nucleating agent, calcium carbonate powder and low-density polyethylene as raw materials, with nylon or polypropylene as the main raw material, and take 60 to 75 parts by weight;

[0026] S2. Add 20 to 35 parts of nucleating agent, 2 to 10 parts of calcium carbonate powder and 1 to 20 parts of low-density polyethylene by weight to the main raw materials as modifiers and fillers, and mix them evenly to improve the rigidity and processing properties of the material. Before adding the nucleating agent, calcium carbonate powder and low-density polyethylene to the main raw materials, sieve the nucleating agent, calcium carbonate powder and low-density polyethylene to remove impurities, and ensure the purity and consistency of the particle size of the nucleating agent, calcium carbonate powder and low-density polyethylene;

[0027] S3, feeding the raw materials uniformly mixed in step S2 into a twin-screw extruder, setting the processing temperature of the twin-screw extruder at 160° C. to 200° C., performing melt mixing and granulation to obtain modified plastic particles;

[0028] S4. The modified plastic particles obtained in step S3 are fed into an injection molding machine, and a protective plastic needle is prepared through an injection molding process.

[0029] Wherein, step S2 also includes a pretreatment step for the raw materials: drying the nylon or polypropylene at 80°C to 100°C for 2 to 4 hours to remove moisture and avoid the generation of bubbles during the processing.

[0030] Embodiment 3: Based on Embodiment 2, this embodiment provides a method for preparing a protective plastic needle, which specifically includes the following steps:

[0031] Take 70 parts of nylon, 25 parts of nucleating agent, 2 parts of calcium carbonate powder and 3 parts of low-density polyethylene as raw materials by weight;

[0032] After the raw materials are uniformly mixed according to the above proportions, they are sent to a twin-screw extruder for melt mixing and granulation at a processing temperature of 180° C. Subsequently, the obtained modified plastic particles are sent to an injection molding machine for injection molding to obtain protective plastic rubber needles.

[0033] Performance characteristics: After actual testing, the surface hardness of the product increased to 120 Rockwell hardness, and the breaking elongation rate dropped to 300%. After actual testing, the rubber needle was removed after passing through the fabric / product, which effectively controlled the breaking point at both ends of the extension line, thereby better protecting the fabric / product itself.

[0034] Embodiment 4: Based on Embodiment 2, this embodiment provides a method for preparing a protective plastic needle, which specifically includes the following steps:

[0035] Take 75 parts of nylon, 20 parts of nucleating agent, 2 parts of calcium carbonate powder and 3 parts of low-density polyethylene as raw materials by weight;

[0036] After the raw materials are uniformly mixed according to the above ratio, they are processed and granulated using a twin-screw extruder at 180°C, followed by injection molding.

[0037] Performance characteristics: The surface hardness of the product is 122 degrees Rockwell hardness, and the breaking elongation is 295%, which is slightly higher than that of Example 4. The disassembly test results show that the breaking points are mainly concentrated in the extension line part, and the fabric protection effect is good.

[0038] Embodiment 5: Based on Embodiment 2, this embodiment provides a method for preparing a protective plastic needle, which specifically includes the following steps:

[0039] Take 60 parts of polypropylene, 30 parts of nucleating agent, 5 parts of calcium carbonate powder and 5 parts of low-density polyethylene as raw materials by weight;

[0040] After the raw materials are uniformly mixed according to the above ratio, they are processed into granules at 180° C. by a twin-screw extruder and injection molded.

[0041] Performance characteristics: The surface hardness of the product reaches Rockwell hardness 121 degrees, and the elongation at break is reduced to 298%. In the fabric penetration and disassembly test, it shows excellent performance, and the breaking point is controlled at both ends of the extension line, which has a good protective effect on the fabric.

[0042] Comparative Example:

[0043] Raw material ratio: Take 100 parts of unmodified nylon (without nucleating agent, calcium carbonate powder or low-density polyethylene added).

[0044] Preparation method: directly feed the nylon raw material into a twin-screw extruder for processing and granulation, and perform injection molding under the same conditions to obtain a rubber needle.

[0045] Performance characteristics: The rubber needles made of unmodified nylon show lower rigidity, higher elongation at break and poor processing performance.

[0046] In summary, it can be seen from Examples 3 to 5 and the comparative examples that the protective plastic rubber needle provided by the present application reduces its elongation at break while maintaining its hardness, and can be easily disassembled under normal striking and fastening conditions of the fabric, so as not to damage the fabric / product itself during the disassembly process. While maintaining toughness, the elongation at break is reduced, and during disassembly, the protective plastic rubber needle breaks at the connection between the extension line and the unilateral cylinder or the sheet-type part.

[0047] Modification treatment plays a vital role in improving the performance of protective plastic needles. By adding appropriate amounts of modifiers and fillers and optimizing the preparation process conditions, key indicators such as the rigidity, elongation at break and processing performance of the needles can be significantly improved, thereby meeting a wider range of application needs.

[0048] The present invention significantly improves the rigidity and tensile strength of the material by adding nucleating agents, calcium carbonate powder, low-density polyethylene and other modifiers and fillers to the main raw materials such as nylon or polypropylene. After the glue needle passes through the fabric, the breaking point can be effectively controlled at both ends of the extension line during disassembly, thus avoiding the phenomenon of damage caused by the glue needle passing through the fabric.

[0049] The modified plastic particles are melted and mixed evenly in the twin-screw extruder, and the processing temperature is controlled within an appropriate range, ensuring good material fluidity and injection molding quality, which not only improves production efficiency, but also reduces product defects and improves the overall quality of the product;

[0050] The glue needle can accurately control the breaking point during disassembly, avoiding problems such as snagging and damage caused by traditional glue needles that easily penetrate the fabric, thereby effectively protecting the integrity and aesthetics of the fabric product.

[0051] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0055] In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0056] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Protective plastic needle, characterized in that: The raw materials are proportioned as follows by weight: 60-75 parts of nylon or polypropylene, 20-35 parts of nucleating agent, 2-10 parts of calcium carbonate powder and 1-20 parts of low-density polyethylene.

2. The protective plastic needle according to claim 1, characterized in that: The preparation method of the protective plastic needle comprises the following steps: S1. Prepare nylon or polypropylene, a nucleating agent, calcium carbonate powder and low-density polyethylene as raw materials, with nylon or polypropylene as the main raw material, and take 60 to 75 parts by weight; S2, adding 20 to 35 parts by weight of a nucleating agent, 2 to 10 parts by weight of calcium carbonate powder and 1 to 20 parts by weight of low-density polyethylene as a modifier and filler to the main raw materials, and mixing them uniformly; S3, feeding the raw materials uniformly mixed in step S2 into a twin-screw extruder for melt mixing and granulation to obtain modified plastic particles; S4. The modified plastic particles obtained in step S3 are fed into an injection molding machine, and a protective plastic needle is prepared through an injection molding process.

3. The protective plastic needle according to claim 1, characterized in that: In step S3, the processing temperature of the twin-screw extruder is set at 160°C to 200°C.

4. The protective plastic needle according to claim 2, characterized in that: Step S2 also includes a pretreatment step for the raw materials: drying the nylon or polypropylene at 80° C. to 100° C. for 2 to 4 hours.

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