3.2.3 Packaging Machinery Selection
Fit-to-body packaging machines are generally manual, simple in structure, and inexpensive because they do not require molds for replacement, so they are relatively flexible. The main types of machines are thin film heating machines and flow filling machines. The film heating body machine manually places the substrate and the packaged equipment in a desired position, heats the plastic film in a holder, and then attaches the softened plastic film to the equipment and applies a vacuum. Substrate bonding. The difference between the flow infusion machine and the film heating machine is that the granular resin plastic is heated and melted and then extruded from the extruder head to form a molten film through a special nozzle covering the equipment and the substrate. This kind of packaging method has a higher degree of automation, and the packaging effect is also very good.
3.3 Shrink Packaging
Shrink wrap is a promising packaging technique in which a wrapper and a wrapper are wrapped with a heat shrinkable plastic film and then heated to shrink the film and wrap the wrapper and the wrapper. Used in the field of weapon maintenance equipment packaging, it is mainly used for packaging and packaging of special-shaped equipment and trays that are difficult to pack by general methods.
3.3.1 Key Features The shrink wrap has the following characteristics:
a. Shrink packaging can be tightly attached to the package, which can evenly bind and fix the items, eliminating the cumbersome operations of strapping materials such as packaging tapes;
b. Shrinking packaging allows tightly packed parts to shrink together, reducing the space occupied. Since the plastic film has good toughness and cushioning properties, the contents are fully fixed and can effectively prevent the impact of impact and vibration on the contents of the contents. , Compact packaging, and not easy to damage;
c. Shrink packaging can be used for the collection and packaging of pallets, which can tightly pack articles and trays, save packaging costs, and effectively protect the product;
d. Shrink packaging can realize mechanized packaging, which is convenient for supporting the production line. The packaging efficiency is greatly improved. The packaging equipment is simple, the work is stable and the versatility is good.
3.3.2 Selection of Packaging Materials
Currently used more shrink film is polyvinyl chloride, polyethylene, polypropylene and other composite shrink film, the choice of the main consideration of the material shrinkage, shrinkage ratio, shrink tension, shrinkage temperature and heat seal. PVC shrinks at a relatively low temperature and has a wide range. The shrinkage temperature is 40 to 160°C. The heat shrinkage is quick and the workability is good. However, the impact strength is low, and it becomes brittle at low temperatures. It is not suitable for the transportation and packaging of equipment. Polypropylene has poor heat sealability and low seal strength, which is not conducive to sealed packaging. Polyethylene has high impact strength, low price, and strong sealing, and it has good packaging effect for equipment. In addition, the recent ethylene-vinyl acetate copolymer shrink film has high impact strength, high transparency, low softening point, good heat sealing performance, small shrink tension, and unbreakable packaging. It is suitable for packaging of protruding parts and special-shaped equipment. .
3.3.3 Packing Method Selection Shrinking packing mainly includes manual shrinking and mechanical shrinking. The manual heat shrinking is usually by manually wrapping the wrapped articles, and then using a tool such as a heat sealing spray gun to blow hot air on the packed articles, and the method is completed. Shrink packaging. This method is simple and rapid. It is mainly used for shrink-wrapping packages that are unsuitable for mechanical packaging, such as large-sized trays or bulky single-piece products. Mechanical shrink packaging operations are generally performed in two steps. First, the articles and packages are pre-wrapped in a mechanical manner. That is, the products are packed in a shrink film, the necessary mouths and seams are heat-sealed, and then the heat shrinks. The prewrapped product is placed in a heat-shrink device and is the most commonly used method.
3.3.4 Packaging Machinery Selection At present, there are many types of shrink packaging machines at home and abroad. Small shrink packaging machines are mainly used for packing small-sized spare parts, and are mostly used for pillow-shaped bag packaging; L-shaped sealing packaging machines and plate heat sealing packaging machines Suitable for various sizes of packaging; large shrink packaging machine is mainly used for corrugated cartons and large bags of product packaging.
4 Conclusion
Blister packaging technology, body-fitting packaging technology and shrink packaging technology were all introduced from abroad in the 1970s. They have been rapidly developed and popularized in the field of civilian packaging. It is considered to be the fastest growing three packaging technologies in the 20th century. There is an extremely broad development prospect. Based on the civilian packaging technology, we have used a reasonable selection of packaging materials and appropriately improved packaging machinery. We have used these three packaging technologies in the military for the first time in the packaging of weapons maintenance equipment, and completed the packaging reform of weapon maintenance equipment. The obvious military and economic benefits have been highly praised by the heads of the army and experts and have great promotional value. At the same time, equipment packaging is a complex system project, and its content is extremely rich. The application of the above technologies needs to be further improved, and its development requires the joint efforts of all parties.
(Author/Zhang Hongju Chen Shisheng)
Automatic Sensor Sanitizer Dispenser
We are the company specializing in manufacturing hotel supplies. Main products are hand push soap dispensers, automatic Sanitizer Dispensers, paper dispensers, hand dryers, hair dryers, Trash Bins, etc. Most of our products have certificates like CE, UL, GS, ROHS. With moulding workshop in house and experience techinicians, we accept OEM ODM products.
wall mount dispensers,standing dispensers,table top dispensers,Foam Soap Dispenser
TAISHAN YUEXIN INDUSTRIAL GROUP LIMITED , https://www.gdmetalproducts.com