In recent years, with the continuous promotion and application of new paper packaging technologies and new products, new paper container products have come to the fore and attracted the attention of the food packaging industry. Paper containers are mostly used for the packaging of fruits and vegetables, dairy products and beverages. Compared with other containers, paper containers have the advantages of light weight, low cost, favorable for logistics, and free of metal dissolution, etc. The disadvantages are that the pressure resistance and sealing accuracy are not as good as glass bottles and Metal cans, etc., can be classified into composite cartons, paper cups, combination cans, etc. depending on the material and shape of the paper containers.
The composite carton mainly consists of a polyethylene composite paper container and a Tetra Pak composite paper structure, consisting of 7 layers in total. From the inside to the outside are polyethylene (two layers), aluminum foil, polyethylene, cardboard, printing ink, polyethylene (or wax layer), for fruit and vegetable juice and beverage packaging.
Paper containers for liquid packaging paper use high-strength paperboard, bleached or not bleached. The thickness of the base paper and the pulp material vary according to the type and size of the container. For example, a large-size paper box with a capacity of 500-1000 ml has a grammage of 300 g/m2 and is mainly made of long-fibre coniferous pulp to prevent the box from swelling and damaging. Exterior. For the 150-200ml small carton, the container is soft, and 100-130g/m2 thin paperboard can be used. The paper pulp of the leaf tree can be mixed, and the fluorescent dye is disabled on the carton base paper.
Polyethylene food containers are made of low-density polyethylene (LDPE) with no additive, good adhesiveness and tightness, relative density of 0.917-0.925, and attention should be paid to its uniformity, film adhesiveness, and tightness during processing. Odor and other issues. The thickness of the composite polyethylene is 40-60 μm on the inner surface and 10-30 μm on the outer surface.
Aluminum foils are used to package reflective heat rays, which can prevent the adverse effects of ultraviolet rays and preserve foods for a long time. The waterproofness of aluminum foil is related to the number of pinholes in aluminum foil. According to tests conducted by Alcoa Corporation in the United States, aluminum foil with a thickness of 9 μm for packaging has an average moisture permeability of 49, while a 13 μm polyethylene composite paper has a moisture permeability of 90 and a polyethylene film of 0.7. The only disadvantage of aluminum foil is the presence of pinholes, and pinholes are inevitably present at 25 μm thick aluminum foil.
When the thickness of the aluminum foil increases, the incidence of pinholes decreases and the reliability increases, but the cost is also high. There are generally two types of molding methods for a composite carton: one is a folding type flat paper box that is pre-formed by a paper tray forming machine, and is then formed after use. Another way is to start with raw materials, sterilization, molding, filling, and sealing are all done in one packaging machine.
The combination tank is a new type of three-piece can. The material of the can body is composed of polypropylene, chromium foil and hard cardboard, and is formed by flat winding or spiral winding. The latter is more economical and reasonable, but it can only make round cans. Can lids are made of aluminum or tinplate. Combined cans can seal up to 500 cans per special type, compared with metal cans, combined cans are light and low cost. The combination tank itself is still a paper container and has a tighter seal than a metal tank. It is not suitable for autoclave sterilization and focuses on aseptic packaging or hot filling.
Leisure chairs are a type of furniture used for rest, relaxation, and enjoyment, typically with comfortable seat and backrest designs to provide optimal comfort and support. There are a wide variety of leisure chairs that can be classified based on different functions, materials, styles, and uses. The following will introduce several common categories of leisure chairs.
1. Classification by function:
-Lying chair: Lying chair is a leisure chair that can adjust its angle to meet different needs, and can be used for lying, reading, resting, or sunbathing.
-Lazy chair: Lazy chair is a large and comfortable leisure chair, usually with a wide seat and backrest, which allows people to sit or lie comfortably.
-Leisure sofa: A leisure sofa is a leisure chair with multiple seats that can be used by multiple people at the same time and is usually used for family entertainment or leisure activities.
2. Classification by style:
-Modern style chairs: Modern style chairs usually adopt simple lines and modern design, with fashionable and minimalist characteristics, suitable for modern home decoration.
-Classical style chairs: Classical style chairs usually adopt retro designs and exquisite carvings, with elegant and luxurious characteristics, suitable for classical style home decoration.
-Nordic style chairs: Nordic style chairs usually adopt a simple and natural design, emphasizing practicality and comfort, suitable for Nordic style home decoration.
3. Classification by purpose:
-Indoor leisure chairs: Indoor leisure chairs are suitable for indoor environments such as homes and offices, and can be used for activities such as rest, reading, and watching TV.
-Outdoor leisure chairs: Outdoor leisure chairs are suitable for outdoor environments such as gardens, balconies, terraces, etc., and can be used for outdoor leisure, sun exposure, and other activities.
In short, leisure chairs are multifunctional and diverse furniture that can be chosen according to different needs and preferences. Whether relaxing at home or enjoying the sunshine outdoors, you can find suitable leisure chairs for yourself.
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Foshan Shengshi Zhihui Technology Co., Ltd. , https://www.officeroutdoorfurniture.com