Research on Comprehensive Technology of Ordnance Maintenance Equipment Packaging Reform (in)

3.1.1 Material Selection
The blister packaging material mainly consists of a bubbling thermoplastic film and a back cover substrate. There are many types of plastic films that can be used for blister packaging. When selecting, the adaptability of plastic films and maintenance equipment must be taken into consideration. That is, the materials used must meet the technical requirements of blister packaging, while minimizing costs. Typical materials for blister packaging are cellulose, styrene, vinyl tree 0S, polyvinyl chloride, composite aluminum books, etc., among which polyvinyl chloride (PVC) has excellent transparency, better thermoformability and heat sealing Sex and high gas barrier, after adding plasticizer can improve cold resistance and impact strength, use better, lower cost, can be preferred.
The substrate is also a major part of the blister pack. As with plastic films, the size, shape, and weight of the device must be taken into account when choosing. Substrates mainly include white paperboard, coated composite materials (mainly coated heat-seal coatings), corrugated cardboard, coated aluminum books, and polyvinyl chloride and other composite materials.
After scientific analysis and repeated tests, ordnance maintenance equipment used polyvinyl chloride (PVC) as the material for blister packaging containers, and its thickness was 0.25mm, 0.35mm, 0.50mm, and 0.60mm.
3.1.2 Methods Choosing blister packs vary from device to device. At the same time, there are many kinds of blister packaging machines, so there are many kinds of blister packaging methods. According to the operation method, there are mainly three kinds of manual operation, semi-automatic operation and automatic operation.
According to the size and shape of the ordnance maintenance equipment and the comprehensive comparative study, the semi-automatic packaging method was selected. The process is: PVC sheet (film) material feed → heating → plastic molding → cutting and sorting → inspection → loading → bottom cover → high frequency heat sealing → inspection → labeling.
3.1.3 Equipment selection The blister packaging machine forms transparent plastic film or sheet into blisters, and seals the product to the machine between the blisters and the bottom plate by means of heat sealing and bonding.
Blister packaging machinery and equipment are mainly blister forming machine and heat sealing machine. The blister forming machine is heated by hot air flow and heat radiation. Among them, heat radiation heating is to use radiant heat generated by a heater to heat the material, and the heating efficiency is high. Forming methods can be divided into two types: compression molding and suction molding. Blister forming is to vacuum the way to make the softening film close to the mold shape, forming better quality. According to different heat sealing methods, heat sealing machine can be divided into ordinary heat sealing, pulse heat sealing, ultrasonic heat sealing and high frequency heat sealing.
After investigation and research, comparative identification, automatic maintenance equipment blister packaging selection of automatic vacuum molding machine, GZRS000SD high-frequency plastic heat sealing machine and high-speed hydraulic gantry cutting machine.
a. Automatic vacuum molding machine. It is mainly suitable for polyvinyl chloride (PVC), polystyrene (field), polypropylene (PP) reel film or sheet, vacuum plastic manufacturing plastic blister packaging ordnance maintenance equipment. Working principle: heat softening plastic film or sheet, vacuum forming in the mold to become the desired product; its process: film feed into a heating - forming a version; b. GZRS000SD high frequency plastic heat sealing machine. Working principle: The self-oscillation oscillator generates a high-frequency electric field and applies it to the electrode. Under the action of high-frequency electric field, the plastic will generate polarization and generate heat by itself. Under the effect of pressure, the purpose of hot dissolution is achieved. . The equipment is used for heat sealing packages of 83 kinds of specifications polyethylene (PE) material blisters for ordnance maintenance equipment. The specifications are as follows: thickness is 0.18mm, 0.25mm, 0.35mm and 0.60mm; c. High-speed hydraulic gantry trimming machine is used to carry out the trimming process of military maintenance equipment packaging materials.
3.2 Skin Packaging Technology Skin Packaging Place the product on a breathable floor made of cardboard or plastic sheeting (membrane) covered with a heat-softened plastic sheet and evacuated through the bottom plate to make the sheet (film) Tightly wrapped products, all around the seal on the bottom - a kind of packaging method.
Skin-fitting packaging is used in the field of ordnance maintenance equipment packaging and is mainly used to package metal spare parts that cannot be completed with a single blister pack.
Body-fitting packaging is similar to blister-packed packaging, and it is a thermoformed packaging. Apart from the features of intuitive blister packaging, use of square stalks and good cushioning properties, it also has no need of dies, convenient packaging, low cost, and good protection. Features.
3.2.1 The material is body-packed and consists of a plastic film, a heat-sealable coating, and a card substrate. When selecting the material, the size, shape, weight, and other factors of the device should be considered. Appropriate packaging for ordnance maintenance equipment should emphasize the protection, transparency, endothermic property, puncture resistance, and deep tensile properties of the sheet, and should use polyethylene (PE) transparent body roll film and corrugated cardboard (surface coated Gas phase corrosion inhibitor).
3.2.2 Method Selection The principle of body-fit packaging is similar to that of blister packs, but the operation method is different. The main difference lies in three aspects: First, the mold is not used, but the packaged object is used as a mold; It can only be thermoformed by a vacuum squeezing method. Third, many small holes must be made on the substrate in order to allow vacuum.
The substrate for body-fit packaging requires a small hole. The method is to open the substrate cardboard with a needle roller out of the hole. The diameter of the hole is about 0.15mm, and about 3-4 holes per square centimeter. The process is:
Fit thick 0.16mm PE upper and lower body membranes → heat the upper film → place the parts on the paper-laying bottom plate → parts, base plate and upper film body → the bottom plate and lower film body-sealing edges → slitting → inspection → labeling.
3.2.3 Device selection Flush packaging machine: Place the product on the bottom plate so that the plastic sheet (membrane) of the covering device is tightly attached to the equipment under the force of heat and vacuum and is sealed with the bottom plate.
The body-fitting packaging machine is generally of manual type, simple in structure, and cheap in price, because the replacement equipment does not need a mold, so it is more flexible. The main types of the packaging machine are a thin film heating body-fitting machine and a flow-infusion body-fitting machine. 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; flow infusion body machine and film heating body machine difference is: the granular resin plastic melted after extrusion from the extruder head, through a special nozzle to form a molten film, covered in equipment and On the substrate. This packaging method has a higher degree of automation, and the packaging effect is also very good.
After investigation and research, the DXDT480 automatic body-fitting packaging machine has been selected for repeated testing of ordnance maintenance equipment.
DXDT480 fully automatic body packaging machine is a newly developed electromechanical integration new automatic body covering machine, with a programmable controller as the core control unit, using advanced detection, control elements and pneumatic actions to perform components, the work is stable and reliable. Can automatically complete the pull film, clip film, film, film, vacuum body, air-cooled, automatic bottom smelling, sealing, cutting, automatic counting and other functions. It has a higher degree of automation than a conventional body-fitting machine and has a high speed. It can form an automatic water-flowing operation, and the bottom paper sealing bottom moisture-proof innovative is novel and suitable for packaging special-shaped ordnance maintenance equipment.
3.3 Shrink-wrap technology Shrink-wrap shrinkwrap A product that wraps a product or package and then heats to shrink the film to wrap the product or package.
Shrink packaging is used in the field of ordnance maintenance equipment packaging mainly packaging blister, body and vacuum three kinds of methods difficult to package large pieces of equipment, parts, boxes of kits and kits, etc. The specific dimensions are: the length is not more than 1200mm, width Not more than 60mm and height not more than 400mm.
Shrink packaging has the advantages of good protection performance, transparent gloss, low processing cost, light weight, suitable for pallet collection packaging, and suitable for mechanized production.
3.3.1 The use of shrink film is the most important type of shrink packaging material. According to the characteristics that the thermoplastic plastic is restored under the heating conditions, during the process of forming the film from the plastic raw material, it is heated and stretched in advance and cooled to make a shrink film. The manufacturing method includes a secondary film stretching method in which a sheet-shaped film is formed, and then stretched along the longitudinal axis and the transverse axis, and a primary stretching method simultaneously performing stretching in two directions. Stretch or one-stretch method.
Currently used more shrink film material is: polyvinyl chloride, polyethylene and polypropylene, followed by vinylidene chloride, polyester, polystyrene, chlorinated rubber film and nylon resin. The main considerations in selection are shrinkage, shrinkage ratio, shrinkage tension, shrinkage temperature, and heat sealability.
After comparison, the shrink packaging of ordnance maintenance equipment used polyethylene (PE) and polyvinyl chloride (PVC) transparent shrink plastic film as shrink packaging material.
3.3.2 Method selection Shrink packaging operations are generally performed in two steps. The first is pre-packaging, packaging the product with a shrink film, heat-sealing the necessary mouth and seams, and then heat-shrinking to heat the pre-packaged product in a heat-shrinking device.
a. Pre-packaged work. When pre-packaged, the film size should be 10%-20% larger than the size of the device. If the size is too small, the infilling is inconvenient, and the shrinkage tension is too large, and the film may be broken. If the size is too large, the shrinkage tension is insufficient, and the package is not tight or uneven. The thickness of the shrink film used can be determined according to the size and weight of the equipment and the required contraction tension;
b. Heat shrinking operation. The equipment used for heat shrinking is called a heat shrink tunnel (also called heat shrink tunnel) and consists of a conveyor belt and a force 0 hot chamber. The heat shrinking process is: placing the prepackage on the conveyor belt, the conveyor belt running at the specified speed, sending it to the heating chamber, blowing hot air to the package for heating; leaving the heating chamber after the heat shrinking, cooling naturally, from the conveyor belt Remove it. After comparing the above methods, the process of shrink packaging of ordnance maintenance equipment is: using a 0.25mm thick PE film or PVC plate (sheet) plastic container → loading → heat shrink machine heating → shrinkage → sealing → cooling → inspection → attach a label.
The main parameters of commonly used shrink film and contraction channel are shown in Table 1.

3.3.3 Machine Selection The shrink packaging machine is a machine that heats the product after wrapping it with a shrink film and shrinks the shrink film to wrap the product tightly. There are many kinds of shrink packaging machines at home and abroad. Small shrink packaging machines are mainly used to pack small parts and components, and are mostly used for pillow-shaped bag packaging. L-type sealing packaging machines and plate heat sealing packaging machines are suitable for various sizes of packaging; Shrink packaging machines are mainly used for corrugated cartons and large bags of product packaging. After repeated investigations and studies and repeated trials, the RS600/400 dual-use heat shrink packaging machine was selected.
RS600/400 dual-use heat shrink packaging machine is used for sealing packaging of large parts and packages. It is mainly used for the packaging of ordnance maintenance equipment for polyethylene (PE) materials with a thickness of 0.12mm, 0.18mm and a width of 1000mm.
The machine is composed of furnace body, cold box, heat and power supply. With the characteristics of long furnace length, sufficient heat, high power, and fast cooling, it is an ideal packaging equipment for shrinking various large and heavy equipment. The machine uses quartz tubes for heat generation as a heat source. Adjust the pressure up and down, and keep the temperature at room temperature up to 250°C, suitable for all kinds of films with different thicknesses. Transmission using electromagnetic frequency variable speed motor, great power, smooth operation. The upper box adopts a flip type, and the lower box bottom plate can be pulled out to one side for maintenance and cleaning. A vortex fan is installed in the drying tunnel to ensure uniform heat in the drying tunnel. The outlet cooling box is designed with the characteristic of film heat and cold, which guarantees the quality of the packaging.
(To be continued)