The common packaging of plastic dining lunch boxes on the market is a transparent film that clings to the surface of the product and is equivalent to vacuum packaging. This kind of film is actually called heat shrinkable film. It is nontoxic,tasteless and pollution-free,which belongs to environmental protection packaging materials. It is usually used for packaging and sales of various products.They need to do packaging inspection after packing in heat shrinkable film.
A dining box inspection refers to the pre shipment inspection, which help importers review the quality of goods, please refer to Pre Shipment Inspection. In the final step of packaging inspection,surprisingly,a large number of defects were found here, such as bubbles,film folds,film breakage and film excess. Although the packaging process of heat shrinkable film is simple, only one shrink gun or shrink machine, even a hair dryer and a sealing machine are needed. However, its function should not be underestimated. If bubbles enter to the film,the moisture resistance of the package may be lost and the tear resistance will be greatly reduced. If there are many wrinkles on the film, the cost of heat shrinkable film will increase and the light transmittance will decrease. If the film is damaged, the beauty of the product will drop rapidly, which will directly affect the sales. As a result, the effects of moistureproof, waterproof and dustproof will disappear and the basic functions of the product may be damaged if it is placed in the warehouse for a long time.
In order to avoid these situations, the appropriate shrink film can be selected according to the shape of the product in the early stage, which can be divided into single film, folded film and tube film. At this time, carry out the thermoplastic packaging, there won’t be extra films on the product.If the factory uses recycled materials for secondary processing, the color of the shrink film will turn blue. When thermoplastic packaging is carried out, if hot air is not uniformly or the temperature is low, there may be a large number of bubbles and wrinkles.On the contrary, if the temperature is too high, the film will melt and break.In terms of factory self-inspection, if the defective products are not picked out during packaging inspection and also do not carry out to during production inspection,the defective products will flow to the market and affect product sales. During Production Inspection describes in detail how inspectors check the production of online products in the middle period of product production.
Therefore, the choice of materials in the early stage and completion of product production,then ask a third-party inspection company to check and focus on packaging inspection.After the inspection, the factory reworks the defective products and re-checks the packaging inspection so that transparent packaging can fully play its role.
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