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Here is the content list:
What historical changes have kraft paper bags undergone?
The future of kraft paper bags.
The first shopping kraft paper bag, which was born in 1908 in St. Paul, Minnesota, USA. A local grocery shop owner, Walter DuVernay, began looking for ways to get consumers to buy more things at once to boost sales. DuVernay thought it would be a pre-made bag that was inexpensive and easy to use and could hold at least 75 pounds. After much trial and error, he settled on kraft paper, which was made from coniferous trees with long wood fibers and treated with milder chemicals such as caustic soda and sulphuric alkali during the cooking process, so that the original strength of the wood fibers was less compromised, resulting in a paper that was tightly joined and tough enough to withstand high tension and pressure without breaking. Four years later, the first packaging bag for shopping was created. With its rectangular bottom, it has a larger volume than the traditional V-bottom paper bag. A cord runs through its bottom and sides to increase its load-bearing capacity, and two pull loops are formed at the top end of the bag to make it easier for people to carry. Du Weiner named this shopping bag after himself and applied for a patent for it in 1915. At this time, the annual sales volume of this shopping bag has exceeded 100 million.
It may be an exaggeration to say that the birth of the paper shopping bag has driven the development of the entire retail industry, but it has at least revealed to businesses that you simply cannot predict how much consumers will buy until their shopping experience becomes as comfortable, easy and convenient as possible. This was the point that drew attention to the consumer shopping experience and led to the development of the supermarket basket and trolley.
In the following half-century or so, the development of kraft paper shopping bags can be described as smooth, the improvement of the material to increase its load-bearing capacity, the appearance has become more and more beautiful, manufacturers will be a variety of trademarks, patterns printed on kraft paper bags, into the streets of shops. Until the mid-20th century, the emergence of plastic shopping bags became another large revolution in the history of shopping bag development. It is lighter, thinner, stronger, and cheaper manufacturing costs and other advantages make the once beautiful kraft paper bags eclipsed.
However, with the "anti-plastic" wind prevailing around the world, environmentalists have begun to focus on the old take away paper bags. McDonald's China began in 2006, gradually in all shops to implement a thermal insulation property of take away paper bags to hold takeaway food, to replace the use of plastic food bags. This initiative has also received a positive response from other businesses, such as Nike, Adidas, and other large consumers of the original plastic bags, who have begun to use high-quality take away paper bags to replace plastic shopping bags.
Located in Nanjing, China, Nanjing Lipack Co., Ltd is a large manufacturer of kraft paper bags, which has been exporting kraft paper bags to various parts of the world and has received wide acclaim. The company verifies the quality of each product before it leaves the factory to ensure that the consumer's rights are fully protected.
A corrugated paper box is die-cut, creased, nailed, or glued to make corrugated boxes. Corrugated paper box is one of the most widely used cardboard paper boxes, and the amount has been the top of various packaging products. Next, we will introduce you to corrugated paper boxes.
Here is the table of contents.
What is the technology and principle of the corrugated paper box?
What kinds of shapes are there in corrugated boxes?
1. The main printing methods in the corrugated paper box industry are.
Lithographic offset printing (ink color printing), letterpress printing (carton water-based printing). Compared with color printing, water-based printing has high strength, low cost, high production efficiency (fast delivery time), and an overall printing effect close to color printing, which is widely used in the transportation packaging of products.
2. Main production processes of a corrugated paper box.
Corrugated paper box automatic production line, printing process, post-processing, and forming process; printing work has realized the automatic operation of printing, slotting, die-cutting, gluing and packaging in one process.
3. Water-based printing of corrugated paper boxes belongs to the additive color printing method. The color original is electronically color-separated into a reverse image and then printed on a printing press. The ink is transferred from the anilox rollers of the printing press to the printing plate, and then the ink is transferred from the printing plate to the corrugated board. Most of the cartoon paper boxes are also printed using the overlay color method.
4. Prepress technology (traditional plate making)
(1) Color originals processed by electronic color separation into monochrome and then out of the film sheet (negative image soft film).
(2) Back exposure: exposure of the back of the plate with ultraviolet light to form the base of the printing plate.
(3) The main exposure: remove the protective film on the front of the plate, put on the negative picture, cover the vacuum film, vacuum pumping, the main exposure with ultraviolet light, the content of the negative picture transferred to the printing plate.
(4) Wash plate: wash the plate in the plate washer with a potion to wash off the unexposed resin on the printing plate, forming the intaglio printing plate.
(5) Drying.
(6) De-stick: ultraviolet light source irradiation.
(7) Post-exposure: hardness adjustment.
According to the shape of corrugated, there are 3 designs of corrugated paper boxes: V, U, and UV.
The V-shaped corrugated waveform is characterized by a high value of plane resistance pressure, which saves adhesive usage in use and saves corrugated base paper. However, corrugated paper boxes made of this waveform are poorly cushioned and do not easily recover from pressure or impact.
The U-shaped corrugated waveform is characterized by a large adhesive area, strong bonding, and a certain degree of elasticity (better recovery). When a corrugated paper box is impacted by external forces, it is not as fragile as a V-shaped flute, but the plane is not as strong as a V-shaped flute.
Based on the performance characteristics of V-flutes and U-flutes, UV-shaped corrugated sticks, which combine the advantages of both, are now commonly used. The result is a corrugated packaging paper box that maintains the high-stress resistance of V-flute and the high adhesive strength and flexibility of U-flute.
Nanjing Lipack Co., Ltd. attaches great importance to customer experience, the pursuit of cost-effective products, to provide more valuable and more impressive corrugated paper boxes, to better enhance customer brand recognition and product sales!
Nanjing Lipack Co.,Ltd is a collection of all range of packaging products, especially paper packaging products, which including Kraft paper bags, Luxury paper bag ,paper box, paper labels & stickers, paper tags, bubble bags, poly bags, paper tags… we have a professional team committed to quality control and constantly strive for excellence. We provide customized “one stop” packaging solutions, from initial design and to final packaging delivery. We have all the systems in place to produce the highest quality, most impactful packaging, and fast delivery. Click professional team, manufacturing process & quality control to see more about this.
We are headquartered in Nanjing China, and have three manufacturing facilities across China.
Courier bag is the courier industry to transport documents, documents, information, goods and other bags used for packaging. Courier bags are also known as mailing bags, express packing bags. How much do you know about courier bags?
Here is the content list:
1. What are the uses of courier bags?
2. Courier bags how to classify?
The use of more is made of polyethylene material plastic courier bags, with low cost, easy to use, waterproof performance characteristics.
In addition to the major courier companies that have used customized courier bags, there is the online shopping industry, many businesses to give customers a good image, as well as enhance the image, and play a promotional role, also customized with their characteristics of the courier bags.
1. Courier bag classification by material points have express plastic bags, express file seal, express bubble bags, express bone bags, express woven bags, etc.
Express plastic bags material: low-density polyethylene (LDPE) usually said PE, high-density polyethylene (HDPE) usually said PO, courier plastic bags with low cost, lightweight and other advantages.
PE and PO in the courier plastic bags difference: PE transparency, softness is better, the printing color is brighter; PO has a relatively good mechanical property; in the domestic courier bags like are using PE as the main material, while the foreign general is using PE, PO compound cooperation as the main material of courier bags.
Polyethylene courier bags in the market there are two categories: one is the new material courier bags, the second is recycled material courier bags.
Express document seal material: generally gray background whiteboard paper, white cardboard, kraft paper, mostly. The courier industry generally uses 200 g / m2 to 450 g / m2 weight of paper. Express document seal has the advantages of being flat, not easy to fold bad than the express plastic bags.
Courier bubble bag material: a transparent flexible packaging bag filled with air by the middle layer of the air cushion film. Mainly used in the courier industry small volume fragile, easily damaged, less precise goods packaging purposes. Courier bubble bag with shock-absorbing bubble film, bubble film with countless small bubbles, so the body is light, flexible, with good shock absorption, impact resistance, and non-toxic, tasteless, moisture, corrosion resistance, and other advantages.
Express bone bag material: bone bag (also known as dense bags, by any bag, sealed bags, chain bags, self-sealing bags, polyethylene (LDPE), and high-pressure linear polyethylene (LLDPE) by blowing film molding, heat cutting the bag is made of polyethylene (LDPE) and high-pressure linear polyethylene (LLDPE) by blow molding, heat cutting and making a plastic bag that can be resealed. The bone bag can be used for a variety of small items of internal and external packaging. Self-sealing bags produced with food-grade raw materials can be stored in a variety of small food, tea, seafood, etc., moisture, water, insects, to prevent things from falling apart.
Express woven bags: also known as snakeskin bags. Is a kind of plastic, packaging, its raw materials are generally polyethylene, polypropylene, and other chemical plastic raw materials. Woven bag color is generally white or off-white, non-toxic and tasteless, generally less harmful to the human body, although it is manufactured by a variety of chemical plastics, its environmental protection is stronger, and recycling efforts; mainly used for a variety of items into the packaging and packaging with a wide range of industrial uses.
2. Courier bag classification by raw materials: there are new material courier bags, semi-new material courier bags, recycled material courier bags.
3. Courier bag classification according to whether to print: printed courier bags, non-printed courier bags.
4. Courier bag classification according to whether the folding bottom organ: with folding bottom organ, no folding bottom organ.
5. Courier bags according to whether to add additional bags: with additional bags, no additional bags.
Nanjing Lipack Co., Ltd is one of the leading professional manufacturers in the courier bag industry, with a long history of manufacturing plastic packaging and paper packaging products. If you want to know more about courier bags, please feel free to ask our company for more information.
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