Valve bags are mostly used for filling granular or powdery materials, which are used for loading and unloading bulk materials for convenient transportation. So do you know how valve bags are filled?
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1. Valve bag filling process
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The square bottom machine can use valve pockets to contain all kinds of fine powder and ultra-fine powder materials with low bulk density, strong air affinity, good or bad self-flowing properties.
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The discharge port is unobstructed, the filling starts, the material enters the dividing wheel from the outer silo, and enters the ash hopper from the feeding port on the machine base. The material is evenly sent to the discharging port through the smooth rotation of the impeller. Lightly touch the travel switch on the right side of the material nozzle, the sealing cylinder shrinks, and the material falls into the bag smoothly.

Using the valve bag packaging machine, the material is evenly filled into the valve bag through the discharge seat, and then the filling amount is controlled by weight, and the sealing cylinder extends into the working state to seal the discharge port. That’s all for the valve bag filling process.

2. Advantages of automatic filling and molding of valve pockets
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(1) The valve bag can withstand high temperature filling at 70~80℃ and dozens of handling turnovers.
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(2) The surface of the bag is flat, smooth and beautiful, the pattern is rich in content, the color is clear, and it is anti-counterfeiting.
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(3) It has good sealing, moisture-proof, waterproof and anti-fouling properties, and can be stacked in the open air for easy transportation and storage. The internal product does not melt, agglomerate, lose quantity or quality.

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(4) The valve bag has a special formula, which will not soften and deform in case of high temperature, and will not rupture in case of severe cold; it is resistant to ultraviolet rays and has stable color; compared with plastic woven bags, it can double the storage and shelf life of outer packaging and inner products.
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(6) The packaging capacity is flexible, and can be designed and manufactured according to the different requirements of different merchants for color, thickness and specifications, which can meet the needs of different manufacturers and different regions.
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(6) Improve the packaging efficiency of valve bags and reduce labor intensity. Due to the use of automated packaging, the packaging speed is 3 to 5 times higher than that of traditional woven bag packaging, and the operator is reduced by about 75%.
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(7) The packaging bag is easy to recycle and protect the ecology.
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(8) With the application of new materials, the thickness of the film is gradually reduced, and the strength is gradually increased, and the comprehensive packaging cost of the valve bag is better than that of the traditional packaging form.
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The above is the whole content of the valve bag filling process and the advantages of automatic filling and forming. The valve bag is relatively high in use in all walks of life. It is very convenient for the packaging and transportation of powdery bulk materials. The prospects are broad.

Valve bags are widely used at this stage and often appear in people’s daily life. The following square bottom machine manufacturers will popularize the difference between valve bags and open bags.

The difference between a valve bag and an open bag

1. Different definitions

(1) Valve bag

Valve bags, as the name suggests, have a “valve”. The bag body is sewn up and down, leaving a feeding bag (valve) for machine filling, and the packaged products are loaded into the bag from the filling port under the action of pneumatic or mechanical power.

The valve bag is further divided into an outer valve bag and an inner valve bag. The principle of the sealing method is that when the goods are filled, the contents will squeeze and seal the valve bag from the inside to achieve the purpose of sealing. The outer valve bag is filled with the material. It needs to be manually folded, and the inner valve bag is automatically sealed after the material is filled.

(2) Open bag

From the point of view of the bag itself, the open bag is a straight tube with a bottom bottom and no seal on the top. The packaged products are directly poured or put into the bag under the action of gravity, and are sewed and packaged by an industrial sewing machine. The various shopping bags, convenience bags and woven bags we usually use can be called open bags.

2. The production process is different

The processing technology of open bag and valve bag is different and the products suitable for packaging are also different. The valve bag packaging cost is high, and the packaging machine is also more expensive, but the weighing is very accurate, easy to stack, and because it does not need to be re-sealed, it saves a lot of human resources, making production more efficient, and the valve bag packaging is more beautiful, It also enhances the image of the product virtually.

The open bag packaging has low technical content, and it needs to be sealed again after the material is full, which requires a lot of labor costs. However, due to its low cost, it is also widely used in all walks of life.

3. Different production equipment

For different packaging bags, its packaging machines are naturally divided into valve bag packaging machines and open bag packaging machines. The valve bag packaging machine is an automatic quantitative packaging machine designed for various fine powder or ultrafine powder materials with low bulk density, strong air affinity, and excellent or poor self-flow.

It is mainly divided into: impeller packaging machine, spiral packaging machine, pneumatic packaging machine. The paper tube machine and square bottom machine produced by our company have rich experience in the production of valve bags, which can meet the requirements of different valve bag sizes and specifications.

The kraft paper valve bag has the characteristics of beautiful appearance, moisture-proof and convenient use. It is suitable for long-distance transportation and storage. It is often used for various chemical raw materials, pigments, food additives, building materials and other materials suitable for packaging. The demand is large, so how do we buy and buy?

 The quality judgment method of cowhide valve bag

1. Use the illumination transmission method: test the shading of the cowhide valve bag, choose a cowhide valve bag, install it on the opened incandescent bulb, observe the way the illuminated transmission cowhide valve bag looks, if there are no special spots, lines, pieces, etc. Obvious phenomenon, this shows that the kraft paper is basically qualified and the weight is uniform. If the light transmittance is poor, test the shading of the kraft valve bag. The shading of the kraft paper valve bag depends on the speed and degree of coloring of the fruit after unpacking.

2. Use the incubation method: test the waterproofness of the kraft valve bag: incubate the kraft valve bag, and when water forms droplets on the kraft valve bag, the kraft valve pag has poor water absorption, and the kraft paper valve bag with good waterproofness has water and kraft paper. The water resistance of the valve bag determines the strength of the kraft paper valve bag against rainwater, determines the life of the kraft paper valve bag, and can also affect the fruit infection by spoilage bacteria.

3. Use the cup exhaust method: test the air permeability of the kraft paper valve bag, seal the kraft paper valve bag on the cup filled with hot water, exhaust on the paper surface, the kraft paper valve bag has good air permeability and does not return air, the kraft valve The air permeability of the pocket is poor, and the air permeability of kraft paper affects the occurrence of fruit diseases and the gloss of the fruit surface to a certain extent.

4. Tear method: tear the valve bag of kraft paper horizontally. The paper with sheared hair is wood pulp paper, which has high strength, neat cracks, no shearing, straw paper and wood pulp composition, and low strength.

5. Touch method: The surface of different types of kraft paper is different, and the roughness is also different. Touch the kraft paper with your hand to feel the smoothness. Compare with the previous sample to see if there is any difference, and pay attention to see if the surface of the paper is Defects such as pinhole streaks.

6. Burning method: After burning, the paper that does not scatter the ash on the paper is the difference between the paper that good paper scraps cannot form.

7. Rubbing technique: soak the kraft paper valve bag in water for a while, after taking it out, rub it with both hands, preferably with lint-free or rub-resistant paper.

In addition to the quality judgment method of cowhide valve bags described above, we should also consider other factors such as manufacturer, price, distance and so on when we choose valve bagts. Let’s take a look together.

The purchase skills of cowhide valve bags

1. The strength of the manufacturer: No matter what product is selected, the strength of the manufacturer is a key factor that needs to be considered. The strength of the manufacturer directly affects the production capacity of the manufacturer and the after-sales quality assurance of the product.

2. Product equipment: Product equipment is one of the key factors related to product quality, and the quality of equipment directly affects the quality of the valve bag. The bottom paste machine produced by Huatian is the main production equipment for the production of valve bags. After years of research and improvement, our equipment has certain advantages in the production of various valve bags. Welcome to inquire and understand.

3. Price: Before considering the cooperation of local manufacturers with a certain scale, you can shop around and choose the manufacturer when it meets our budget requirements.

The above is an introduction to the quality judgment methods and purchasing skills of cowhide valve bags. I hope it can be helpful to everyone. In addition, our company focuses on the research and development, manufacturing and sales of equipment such as fully automatic reference and valve mouth paste bottom machines. Welcome to consult and understand if necessary.

All kinds of packaging bags are commonly used in daily life, such as cement bags, mortar bags, chemical bags, food bags and other valve bags that are commonly used in the industrial field. Do you know how it is produced? They are all made by the square bottom machine and the paper tube machine.

What is a square bottom machine

The square bottom machine is a kind of equipment used to make valve bags. It is used together with the paper tube machine. The two main equipment used to make valve bags adopts the integration of photoelectric, electromechanical and pneumatic technology, and is controlled by the photoelectric PLC automatic control system program finish. The square bottom machine has a paper tube machine that is responsible for unwinding and overprinting the bag body of the valve bag. The square bottom machine is responsible for the sealing of the valve bag. The bottom is opened through automatic gluing, bag tube conveying, valve opening strips, automatic gluing, and bags. Bottom turning and other processes are jointly produced to complete a valve bag. The square bottom machine can realize the processes of automatic feeding, gluing, and transportation, instead of manual operation, which greatly improves the production efficiency. At the same time, it can be more convenient and save a certain amount of raw materials.

The structure of the square bottom machine

1. Rotary bagging machine part ;

2. Straightening part (including double bag and diagonal bag removal) ;

3. Indentation, slitting, and opening ;

4. A valve port (including thumb port function, paper film dislocation function) valve port length 9cm-27cm ;

5. The second valve port part (including the cylindrical valve port and the hot melt adhesive intermediate seal), the valve port length is 9cm-27cm ;

6. Internal reinforcement part, internal steel bar length 20cm-35cm ;

7. Glue indentation part ;

8. Forming part ;

9. The length of the outer reinforcement part (cut after color code) is 25CM-40CM ;

10. Big S bag press system ;

11. Bag out position ;

12. Automatic order change function, waste bag detection and rejection function .

Square bottom machining process

1. Opening at the bottom of the bag

The opening of the bottom of the bag is determined by the parallel direction along the vertical wall at the end of the shoe upper, and the vacuum bag makes a downward horizontal reciprocating movement. The paper wings of the straw suction bag tube are splayed upwards and downwards at both ends. Rotate the claws and insert the opening tube into the bag. The end of the bag-pressing marking line forms a triangular bag corner. After pressing it to the next conveyor belt, the vacuum suction device and the claw opener can be adjusted by pasting width. Tighten according to specifications. Synchronous coordination of main conveyor belt, material suction and claw opening machine.

2. Sticky valve mouthpiece

The valve port of the bag tube starts to work from the paper reel, is guided to the correct path by the corrector, and is positioned and broken. From the plaster to the side of the bag tube opening wing at high speed, the electronic control system monitors the strip path. If there is a space or a paper bag at the location, the control system will order the strip to be cut. To be ruled out, the pasted wheel will not be pasted.

3. Automatic gluing

Before the bottom of the bag is formed, it needs to go through two gluing procedures. After entering the formed paper bag, the paper wings of the bag are folded in the opposite direction of the deformed end and the deformed plate. They are assembled on the core-wrap plate according to a fixed size, and run after the paste is discharged from the outer core, and they are firmly pressed by rolling.

BAG width adjustment: (1) Glue and paste on the valve position; (2) Wipe the paper wings horizontally, and make clear instructions in the electronic control system according to the set procedure.

The above is the introduction of the square-bottom machine. The size of the valve pocket made by the square-bottom machine varies according to different models, and the specific size setting is also carried out according to the needs.

What is a valve bag? The valve bag, as the name implies, is to leave a “valve” on the package. After the bag is glued up and down, leave a feed port for machine grouting and filling, and use mechanical power or pneumatic force to load the bag from the feed port. middle. It is often used to pack powder and granular materials in building materials, chemicals, and food. Let’s learn more about the relevant knowledge about valve bags.

1. What is a valve bag

1. Definition of valve bag

The valve bag is also called the paste bottom bag. The valve bag has an insertion opening with a valve at the upper corner of the bag. When packaging, the filling nozzle is inserted into the valve opening for filling. The filling process is in a sealed state and is often used to hold some powder. The texture of the material avoids splashing and leakage, and the self-sealing can be completed with a paste bottom machine, without the need for bonding.

2. Classification of valve bags

(1) Classified by material: It can be divided into pp valve bag, PE valve bag, paper-plastic composite valve bag, kraft paper valve bag and multi-layer kraft paper valve bag. PP valve bag is made of polypropylene woven cloth upper valve port or lower valve bag, which can improve packaging efficiency than ordinary PP woven bags; PE valve bag is made of polyethylene woven cloth valve port; paper-plastic composite valve bag is It is made of plastic woven bag (cloth for short) as the base material and compounded by casting method (cloth/membrane composite is two-in-one, cloth/membrane/paper composite is three-in-one); the material of kraft paper valve bag is mainly Kraft paper, of which kraft paper is divided into imported kraft paper and domestic kraft paper.

(2) Classification according to the sealing method: According to the sealing method, the valve bag can be divided into two types: inner valve port and outer valve port. The outer valve port needs to be folded manually after the material is filled, and the inner valve bag is automatically sealed after the material is filled.

Second, the advantages of valve bags

1. High material firmness: It has the printability of paper and the moisture-proof and firmness of plastic, and it is a new type of material.

2. High packaging efficiency: It has self-sealing capability. After filling with filling equipment, self-sealing can be completed. It has the characteristics of improved packaging efficiency, convenient transportation, strong firmness, and low breakage rate.

3. Wide range of application: widely used in the packaging of powdery and granular products such as chemical raw materials, new building materials, high-tech materials, pharmaceutical additives, food additives, starch, milk fat, engineering plastics, leaf paper bags, pet food bags, etc.

4. Renewable materials: plastic bags are made of petroleum polyethylene. The raw material used is petroleum, which is already our scarce energy. In contrast, the raw material of the valve bag is trees, which are renewable resources, so the valve bag also saves resources for us.

The above is an introduction to what is a valve bag, and the advantages of the valve bag are also mentioned in the article. Valve bags have been widely used in many industries in recent years due to their convenience, easy storage, and wide range of applications. The square bottom machine produced by our Huatian Packaging Machinery Industry Co., Ltd. is designed for making valve bags. For large-scale production needs, welcome to inquire and understand.