The basic principles for the selection and compliance of environmental test equipment:
1. Reproducibility of environmental conditions
It is an elusive thing to completely and accurately reproduce the environmental conditions in nature in the laboratory. However, within a certain tolerance range, people can correctly and correctly simulate the external environmental conditions that the engineering products are subjected to during use, storage, transportation, etc. This paragraph is summarized in the language of the project, which is “test equipmentâ€. The environmental conditions (including the platform environment) created around the test product should meet the environmental conditions and tolerance requirements specified in the product test specification. For example, the temperature box used for military product testing should not only meet the test values ​​and test time of high temperature and low temperature specified by the national military standard GJB150.3-86 and GJB150.4-86 according to different types of products, but also meet the test. The requirements for temperature field uniformity and temperature control accuracy in the specification. Only in this way can the reproducibility of environmental conditions in environmental tests be guaranteed.
2. Repeatability of environmental conditions
An environmental test equipment may be used for multiple tests of the same type of product, and one engineered product may also be tested in different environmental test equipment in order to ensure that the same product is in the same test test. The comparability of the test results obtained under the conditions necessarily requires the environmental conditions provided by the environmental test equipment to be reproducible. That is to say, the stress level (such as thermal stress, vibration stress, electrical stress, etc.) applied to the product under test by the environmental test equipment is consistent with the requirements of the same test specification.
The repeatability of the environmental conditions provided by the environmental test equipment is guaranteed by the national metrological verification department after passing the verification according to the verification procedures formulated by the national technical supervision agency. To this end, environmental testing equipment must be required to meet the requirements of various technical indicators and accuracy indicators in the verification procedures, and the time limit specified in the verification period should not exceed the time limit. If the use of the very common electric vibration table meets the technical requirements such as excitation force, frequency range, load capacity, etc., it must also meet the requirements of the lateral vibration ratio, mesa acceleration uniformity, harmonic distortion degree, etc. specified in the verification regulations. And the use period after each verification is two years, more than two years must be re-qualified before they can be put into use.
3. Controllability of environmental condition parameters
The environmental conditions provided by any environmental test equipment must be observable and controllable, not only to limit environmental parameters to within certain tolerances, but also to ensure reproducibility and repeatability of test conditions, and It is also necessary to proceed from the safety of the product test in order to prevent the damage of the test product due to the out of control of the environmental conditions, resulting in unnecessary losses. At present, the accuracy of the parameter test generally required in various test specifications should not be less than one third of the tolerance of the test condition.
4. Exclusivity of environmental test conditions
Every environmental or reliability test conducted has strict regulations on the types, magnitudes and tolerances of environmental factors, and excludes environmental factors required for non-testing to penetrate them in order to judge and analyze products during or after the test. In the case of failure and failure modes, the exact basis is provided. Therefore, the environmental test equipment is not allowed to add other environmental stress interference to the test product except for the specified environmental conditions. For example, the leakage magnetic field of the table, the acceleration signal-to-noise ratio, and the ratio of the total rms value of the in-band and out-of-band acceleration are defined in the electric vibration table verification procedure. Accuracy indicators such as random signal test and harmonic distortion are all verification items to ensure the uniqueness of environmental test conditions.
5. Safety and reliability of test equipment
Environmental tests, especially reliability tests, have long test cycles. The test objects are sometimes high-value military products. During the test, testers often have to operate or test around the site. Therefore, environmental test equipment must be operated. Safe, easy to operate, reliable to use, long working life, etc., to ensure the normal operation of the test itself. The various protection, warning measures and safety interlocking devices of the test equipment should be perfect and reliable to ensure the safety and reliability of the test personnel, the tested products and the test equipment itself.
Plush key chain its main materials are plush fabric and polypropylene cotton packing. There are four main types of plush fabrics. The first common yarn, made of BOA material, can be classified as light, usually straight, and can be divided into Yin and Yang yarns in different directions. And matte gauze namely matte color, basically do not have Yin and Yang two faces. The second type of yarn is called specialty yarn. It has sheeting and long and short wool. Wool length is controlled at 4-20 mm. The third kind is called plush, wool in 20-120mm range of growth, 20-45mm range can do any wool growth, 45mm above only 65mm and 120mm, belongs to long hair, wool is straight, not easy to curl. The fourth type is called curly hair, which is usually grainy hair, wool, or hair roots that are bunched and rolled up. Polypropylene fiber cotton, commonly known as baby cotton, hollow cotton, also known as cotton, chemical fiber man-made materials polypropylene fiber, polypropylene fiber (a plastic optical density, special attention to polypropylene fiber is different from polyester can not be confused) from the difference in the process: there are mainly hollow fiber and two kinds, respectively: good elasticity of the product, feel smooth. Our company produces plush key chain beautiful and generous, durable, three-dimensional strong, bright color, compact. Products can be made according to customer requirements of different specifications, color, thickness, grade, packaging, etc., LOGO can be customized, is a good choice for promotional gifts. Key chain not only can adorn your life, but also can highlight your noble, a person's key chain with what kind of gift can see this person's personality, life, and hobbies, also can see who can bring you good luck.
Major description:
1. Cloth ordering: in modern society, there is a clear division of labor, and manufacturers have their own responsibilities for the manufacturing of cloth and the production of doll products. Production problems tend to occur in non-factory processes. For this reason, it is particularly important for us to control the quality of materials. We strictly select several fixed material cooperative factories, which not only ensure the richness of material color, but also control the stability of material quality.
2. Making knife mold: the time required for making the knife mold of plush dolls is short, and it only takes a few hours from the start of making to the official use of the knife mold. Come on! Low price! Fashion! It has become an important factor for most companies to choose plush dolls as promotional gifts, conference gifts and event souvenirs.
3. Fabric opening: there are four ways to open the plush doll: punching machine, laser, electric shearing, and thermal shearing. Punch material opening needs to unfold the whole roll of cloth lamination first. The more layers there are, the lower the material opening cost will be. In the industry, generally, the 28 to 33 layers shall prevail. The factory will be subject to the 28 floor, in each process in strict accordance with the standard implementation to ensure the large cargo and sample effect of the anastomosis.
4. Electric embroidery and silk-screen printing: electric embroidery and silk-screen printing are the main presentation forms of logo or pattern on the customized figures; Silk-screen printing is a printing process, most of the cases are not necessarily electric embroidery looks high-grade. However, electrical embroidery cannot completely replace silk screen printing. For example, small and complex patterns or logo electrical embroidery cannot be realized. Only silk screen printing can show fine and clear patterns. For example, some parts of the requirements to make patterns at the same time to avoid the hardening of the parts affect the appearance (electrical embroidery will lead to the hardening of the parts), then also need to choose the process of electrical embroidery to show the logo or pattern. Of course, we don't have to worry about which process to choose to show our logo. We will provide professional solutions according to the actual situation.
5. Stitching and cutting: stitching is a process of stitching all cut pieces together, which is one of the most important processes in all processes. Whether the sewing process is strictly in accordance with the standardization will directly affect the smoothness of the appearance of the doll; Our factory has established strict sewing standards. A. Sewing seam 45 mm, uniform stop, needle spacing 12 inches. B. Fine needle with 11# needle and 402 fine thread. C. All point positions and bone positions must be aligned and shall not be exploded.
6, rolling cotton: cotton seems to be a simple process, in fact, is a very important process; Indeed, it is very easy to learn cotton, a new master as long as five minutes can learn to cotton. But it's not easy to do the simple job of making cotton well. Cotton is not only to cotton into the doll's shell inside, cotton also needs to be flushed evenly, to ensure that the finished product is a round full appearance. Simple things can be repeated to become an expert, to become a cotton expert needs at least three years to accumulate; And I plant all the cotton puncher is more than five or six years of experts.
7, sewing manual: sewing, manual, is the final process of plush toys finished products; Each doll in the cutting stitching stage will leave a position without stitching, the position is commonly known as leather or cotton left mouth position, as the name suggests is reserved for leather and cotton. And this position can only wait until the cotton is finished after the manual suture.
8. Product quality inspection: the product quality inspection is the last quality control link. After the product passes the quality inspection, it becomes the final product to be delivered to the customer. As a product quality inspector, I need not only the carefulness to find out product defects comprehensively, and the technology to repair defects, but more importantly, a sense of responsibility and a mindset that customers will not be satisfied if I am not satisfied.
Company products to environmental protection materials, exquisite technology, various supporting facilities, advanced technology, perfect management, excellent quality, reasonable price, rapid development, strict confidentiality, perfect after-sales service. Only detailed product drawings (or samples) are required to provide customers with one-stop service from development to after-sales service.
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SHEN ZHEN HAO XIAN LONG TECHNOLGY.CO.,LTD , https://www.haoxianlongtoys.com