The origin of the kraft paper bags

Early in the 19th century, large-scale retail trade is not yet born, people usually working or living near the grocery store to buy all day-to-day items. Those daily necessities is loaded in the cask, bag or wooden box, bulk shipped to grocery store, how they are scattered to be sold to consumers, but it is something of a headache. One can only holding a basket of homemade linen bag to go shopping. Papermaking raw materials at the time still jute fibers and old linen head, poor quality and scarce, and can not even meet the demand for newspaper printing. After 1844 years ago, the German Friedrich Kohler invented the wood pulp papermaking, contributed greatly to the development of the paper industry, but also indirectly gave birth to the first in the history of commercial paper bag. In 1852, American botanist Francis Waller invented the first paper bag making machine, it was subsequently extended to France, the United Kingdom and other European countries. Then, the birth of plywood paper bags and paper bags stitched advances in technology makes it the past cloth bag for bulk cargo transport paper bag the alternative.

And it comes to shopping with brown paper bags, which was born in 1908 in St. Paul, Minnesota, USA. A local grocery store owner Walter Du Weina, in order to promote sales growth, began looking for a way to allow consumers to buy more things at once. Du Weina think that should be a good bag of a prefabricated low-cost and easy to use, and at least be able to withstand the weight of about 75 pounds. After repeatedly after the test, he will lock the texture of this bag in kraft paper, because of its long conifer wood fiber pulp by chemical interaction in the cooking process, the more moderate caustic soda and sodium sulfide chemical processing, making smaller damage to the original strength of the wood fiber, paper, fiber, thus finally produced a close connection between the paper tough, able to withstand greater tension and pressure without rupture. Four years later, the first shopping kraft paper bags born. Its bottom is rectangular, having a greater volumetric capacity than the conventional V-bottom paper bag. The rope runs through the bottom and on both sides, in order to increase its load-bearing capacity, and the in paper bag upper end of the formation of two easier for people to lift the pull ring. Du Weina named for this shopping bags in their own name, and applied for a patent in 1915 for its. At this point, this shopping bag has sold more than 100 million years.

The kraft paper bags appear to change the amount of people shopping is only limited by the number of items in his hands can carry conventional thinking, and also allows consumers to reduce no longer fear to take no less than pleasant experience of shopping itself. If before the birth of the brown paper bags to promote the development of the retail sector as a whole, may be somewhat exaggerated, but it at least to the merchant to reveal such a phenomenon, that the customer's shopping experience as comfortable as possible, easy and convenient, you can not predict consumers buy things in the end. It is also a little aroused latecomer to the attention of the consumer shopping experience, and also to promote the later development of supermarket shopping baskets and shopping carts.

After more than half a century, the development of kraft paper shopping bag can be described as smooth sailing, improved materials and constantly enhance its load-bearing capacity, appearance becomes increasingly fine, manufacturers will be printed on a variety of trademarks, logos kraft bag, into the streets of shops shops. Until the mid-20th century, the emergence of plastic shopping bags to become another major revolution in the history of the development of shopping bags. Slimmer, more robust and cheaper manufacturing cost advantage makes kraft paper bags eclipsed once the glory. Since then, the plastic bag to become the first choice of consumption, and leather bags gradually take a back seat. Finally, the famous scenic, passing kraft paper bags only under the guise of "nostalgia", "natural", "green" in the name is used in a small number of skin care products, clothing and books, audio and video products packaging.

The identifying method of greaseproof paper bag

Greaseproof paper bag also known as coated paper bags, generally used to refer to the material for the paper, and the effect of the anti-oil prominent bags. Use of kraft paper material, also a white material. Mainly used to contain all kinds of fried snacks, such as chicken, pancakes, Dorayaki other oily snacks.

The waterproof of greaseproof paper bag often has a direct relationship with the paper good or bad, the paper identified three methods.

1. Tearing method. Horizontal tear paper bags, hair stubble for wood pulp paper, the intensity is high; tear mouth neatly no hair stubble, compared with less grass pulp and paper or wood pulp composition, low intensity.
2. Hand rub method. Paper bag soaked in water for some time, with both hands after removing the rub, lint or resistance to rubbing of the paper is good.
3. Fire method. After fire, burning parchment molding catechesis and the paper; ashes broken without forming the paper.

Pneumatic Needle Scaler Introduction

Pneumatic Jet Chisel pneumatic applications to obvious the metal surface area rust layer or paint. Respective disciplines: mechanical engineering (a subject); the fitter assembly tools (two topics); fitters and assemblers pneumatic equipment (a few topics). Pneumatic instruments is actually a instrument that makes use of compressed air driven pneumatic motor and exterior output kinetic electrical power.
Pneumatic Needle Scaler get the job done is usually divided into: one) Rotary (eccentric movable vane). two) reciprocating the (displacement aide) normal pneumatic equipment mostly with the conversion of section of the facility output segment, running from the variety of ingestion and exhaust Highway, element of the operation of open and stop the command aspect, the leading portion of the software housing, naturally have to also hold the energy offer for your procedure of pneumatic equipment, air filtration and air strain adjustment section and tool add-ons.
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Our products scope Pneumatic, Electrical and Hydraulic Tools, Oil and Grease Pumps, Deck Items, Hand Resources, Safety Equipments, Hose & Couplings, etc.
Allmarine just like a vital young man with the high-ardor, pure- heartedness and enterprise, is waiting to cooperate and develop together with you in the near future.

Why high-pressure airless paint sprayer is so popular

China's consumer market, the use of the airless paint sprayer is increasingly common, The painting experts: abroad, the most popular way is to use high-pressure airless sprayer construction.Airless spray paint atomization does not require compressed air, to avoid air bubbles and coarse grain during use, users need to understand the product.
Compared with ordinary spray, airless paint sprayer addition to the high pressure and atomization of the coating is not by means of air, but direct pressure which atomized paint.The advantage of this construction method: than general spraying production efficiency can be increased several times to ten times.Much less than general spraying method paint mist, and paint solvent content is also very small, so a reduction of the pollution of the paint mist, and greatly improved the working conditions.
The high pressure airless paint sprayer less mist, the high viscosity of paint, to improve the utilization of the paint, coatings and solvents can save. And it is compared with the general spray coating method, the paint and solvent savings of 5-25%.Used paint viscosity, high solids content of paint, a spray film thicker. Reduce the number of construction labor savings, shorten the construction cycle. Such a spraying method of paint flow without compressed air, eliminating the film defects caused because the compressed air contains moisture, oil, dust, and other impurities. Good film adhesion.Even in the gap, the edges and corners can form a good film.

Installation and use of wilden pump

Wilden pump suction pipe diameter shall be not less than the diameter of the pump inlet end, such as the transmission of high-viscosity fluids, suction pipe diameter is preferably greater than the wilden pump inlet diameter. The inlet end of the suction pipe must be durable, no wrinkles, to be able to produce a high vacuum state. Tsshe diameter of the outlet pipe is at least equal to the outlet diameter, or slightly larger in order to reduce friction losses. All piping and fittings must be leak proof seal, otherwise the pump will reduce the ability to self- absorption.
Pneumatic diaphragm pump installation: should ignore the details of the installation, for a long time of careful planning, research and selection may still lead to poor pumping effect and impact pump life. Location: noise, safety and other logical factors usually the equipment should be installed position requirements. Installed in parallel conflicting requirements may lead to the blocking of the use of regional impact to other pump installation.
Use: First, the position of pneumatic diaphragm pumps must be easy to use, so that maintenance personnel will facilitate routine inspection and debugging.
Gas supply: Each pneumatic diaphragm pump should have a snorkel, and snorkel should be able to provide the amount of air is sufficient to achieve the desired pumping flow. Pressure different pumping needs, but not to exceed 7BAR.
Mounting height: Please give full consideration to the ability to avoid self-priming pneumatic diaphragm pumps to reduce the problem of self- absorption.

what matters of wilden pump need attention

First. Wilden pump note
1. Wilden pump are compressed air as power, proper lubrication can make the pump run more stable and can extend the life of the pump.
2. ensure that the compressed air to clean the dirty gas is easy to wear the valve, we recommend the installation of pneumatic FRL
3. Switch the machine need to slow slow clearance, and to reduce the impact of the pipeline and the diaphragm, and the availability of loose boot checked before piping connection.
4. transportation of dangerous liquids, the exhaust of the pump received a safe place to avoid dangerous diaphragm damage.
5. Conveyor easy to dry and liquid after cleaning to avoid the next start to damage the diaphragm or can not be started.
6) a longer pipeline to the fixed pipeline, can not pump to withstand the weight and vibration of the piping.
Second. Wilden pump troubleshooting:
wilden pump in operation but the flow is too low.
1. Check whether the pump is free of plaque like, adjust the inlet pressure of the compressed air. Reduce the running speed of the pump to adjust the viscosity and concentration of liquid.
2. the check valve ball is stuck. If the transportation of liquid and ball material do not coincide. The ball will swell. Please replace the ball valve and valve seat of the appropriate material.
3. check the inlet pipe is clogged.
Third. Wilden pump can not start or slow
1. check the filter, pressure regulator and lubrication equipment, and air inlet filter is clogged.
2. the check valve is impurities stuck, remove the valve and clean, view the piston within the valve scratch traces. If the piston surface is bright rather than black and pure, said worn need to replace the piston and "O" ring. The traces of the injury. If the piston surface is bright rather than black and pure, said worn need to replace the piston and "O" ring. Please to renew the new product
3. check the spindle and the O-ring scratches, traces of wear and flattening, if damaged, replace.
Fourth. liquid leakage from the chamber outlet
1. check the diaphragm is broken.
2. check whether the diaphragm is installed correctly and locking.
Fifth. the export of liquid containing a large number of bubbles break
1. check the diaphragm is broken.
2. check the pump and piping for leaks.
Shanghai Allmarine Industry supply all variety wilden pumps.Suitable for all  manufacturers and users to choose.More detailed information, you can access http://www.allmarine.com.cn

Why is wilden pump so popular

Wilden pump simply design allows more convenient operation, flow rate and pressure changes, can be simply achieved by adjusting the gas pressure, gas, lift. Since there is no packing or mechanical seal, wilden pump reduces the loss of economic time for packing or mechanical seal failure. wilden pump unique structure of the clamp, and wearing parts industry is minimal and simple design, durable, so troubleshooting is easier, you can see, wilden pump provided to you many benefits, not only to make the liquid flow system to achieve the best results and reduce the cost of your investment and maintenance required.

In the past 50 years, WILDEN Company is committed to technological innovation, new technology applications, the reliability of wilden pump to increase through technological advancement and easy maintenance. Single pump parts in the number of wearing parts is the lowest in the industry. Helping customers to reduce direct maintenance costs and downtime costs incurred in the repair project.