Block bottom bag Types
Block
bottom packaging bags are roughly divided into two types: open bag and valve
bag.
At present, multi-purpose
open-mouth bags are widely used. They have the advantages of the square bottom,
beautiful appearance, and convenient connection of various packaging machines.
Regarding the valve pocket,
she has many advantages such as cleanliness, safety, and high efficiency when
packaging powders.
In principle, the open-mouth
bag is fully opened on the top of the bag when packaging, and the packaged
powder falls from the top to fill it. The valve bag has an insertion port with
a valve port at the upper corner of the bag, and the filling nozzle is inserted
into the valve port for filling during packaging. The filling process reaches a
sealed state.
When the valve bag is used
for packaging, only one packaging machine can basically complete the packaging
work, without the use of additional processes or sewing machines for sewing.
And it has the characteristics of small bags but high filling efficiency, good
sealing, and environmental protection.
Types of valve pockets and
sealing methods
Regular internal valve bag
Common internal valve bag, the general term for the valve port in the
bag. After packaging, the packaged powder pushes the valve port outward so that
the valve port is squeezed and closed tightly. Play the role of preventing
powder leakage. In other words, the inner valve port type valve bag is a
packaging bag that can prevent the powder from leaking as long as the powder is
filled in.
Extended
internal valve bag
Based on the regular internal
valve bag, the valve length is a bit longer which mainly used for heat sealing
for one more secure lock.
Pocket
valve bag
The valve bag with a tube
(used when filling powder) on the bag is called a pocket valve bag. After
filling, the outer valve bag can be sealed by folding the tube and stuffing it
into the bag without glue. As long as the folding operation can achieve a
sealing degree that will not cause problems in actual use. Therefore, this kind
of bag is widely used for manual filling. If there is a need for further
complete sealing, a heating plate can also be used for complete sealing.
Types
of inner valve materials
To respect different industry
packaging requirements, the valve materials can be customized like in non-woven
fabric, craft paper or other materials.
Kraft
paper bag
The widely used raw material
for powder packaging bags is paper. According to cost, strength, ease of use or
handling, etc., the packaging bags constitute various standards.
The number of layers of kraft
paper generally varies from one layer to six layers according to the
application, and coating or PE plastic / PP woven fabric can be inserted in for
special requirements.
Kraft
paper bag with polyethylene film
The structure of the bag is a
layer of polyethylene film sandwiched between kraft paper. Its specialty is
that it has high moisture resistance and is suitable for packaging powders
whose quality can deteriorate as long as they come in contact with air.
Inner
coated kraft paper bag
The innermost layer of kraft
paper is coated with a plastic coating to form a kraft paper bag. Because the
packaged powder does not touch the paper bag, it is hygienic and has high
moisture resistance and airtightness.
PP
woven fabric combined bag
The bags are stacked in the
order of PP woven layer, paper, and film from outside to inside. It is suitable
for export and other places that require high packaging strength.
Kraft
paper bag + polyethylene film with micro-perforation
Because the polyethylene film
is pierced with holes, it can maintain a certain degree of moisture-proof
effect and make the air escape from the bag. Cement generally uses this type of
internal valve pocket.
PE
bag
Commonly known as the weight
bag, it is made of polyethylene film, and the thickness of the film is
generally between 8-20 microns.
Coated
PP woven bag
A single layer PP woven bag.
This is a new and innovative packaging technology, a bag made without adhesives
from coated woven polypropylene (WPP) fabric. It exhibits high strength; is
weather-resistant; withstands rough handling; is tear-resistant; has varying
air-permeability; is recyclable and reusable.
Since it was made by the ADStar machine, people also call it an ADStar
bag. It is superior to other comparable products as far as resistance to
breakage is concerned, is versatile, and also eco-friendly and economical. For
unique packaging requirements, the bag can be produced with UV Protection and
with various colored woven fabrics.
Laminations are also an
option, to give a gloss or special matt finish, with high-quality graphics
& printing up to 7 colors, including process printing (photographic), i.e.:
Laminated with BOPP (gloss or matt) film with high-quality photographic
printing for the ultimate presentation.
Advantages of the PP woven
block bottom bag:
Higher
Strength
Compared to other industrial
sacks, Block Bottom Bags are the strongest bags in polypropylene woven fabric.
That makes it resistant to dropping, pressing, puncturing, and bending.
Worldwide cement,
fertilizers, and other industries have observed a zero breakage rate by using
our AD * Star bag, doing all stages, the filling, the storage, the loading, and
transportation.
Maximum
protection
Coated with a layer of
lamination, Block Bottom Bags keep your goods intact till they are delivered to
the customer. Including the perfect shape and intact content.
Efficient stacking
Due to the perfect
rectangular shape, Block Bottom Bags can be stacked high using space
efficiently. And can be used in both manual & automatic loaders.
Fits perfectly with
palletizing or truck loading equipment, as it is the same size as other sacks
made from different materials.
Business benefits
Block Bottom Bags fits perfectly
with palletizing or directly in trucks. So its transportation becomes very
easy.
Packed goods will reach the
end customers in perfect condition so it will give the factory more trust and
market share.
No Spillage
Block Bottom Bags are
perforated with a star micro-perforation system that allows air to come out
holding the cement or other material without allowing any seepage.
More Market Value through
more printing surface
Block Bottom bags takes a
box-type shape after filling thus offers more printing surfaces on the bag
through Top & Bottom Flat which can be read from the sides when the bags
are stacked.
This increases visibility for
the customers and adds to the brand image and better market value.
Resists water & humidity
High humidity and rough handling
are easily tolerated by Block Bottom bags. So they arrive without any broken at
the customer warehouse, resulting in utmost customer satisfaction.
Environment Friendly
Block Bottom bags are Fully
Recyclable.
It has welded ends and no
toxic glue is ever used, hence avoiding any pollution.
Block Bottom bags are
required in low weight compared to other bags, so we can save raw material.
The low failure rate and
breakage become an important economic factor and a big environmental benefit.
Bag size and valve size
Even if the same material and
the same layer are used, the size of the packaging bag and the valve are very
different. The size of the valve pocket is calculated using the length (L),
width (W), and flattened diameter (D) of the valve port as shown on the right.
Although the capacity of the bag is roughly determined by the length and width,
the important thing when filling is the flattened diameter of the valve port.
This is because most of the filling nozzle size is limited by the flattening
diameter of the valve port. When selecting a bag, the valve port size of the
bag must match the filling port size. And one more important thing is the air
permission rate in case needed.
Bag
application
Block bottom bags are ideal
for different sectors: building material like putty, gypsum; food products like
rice, flour; chemical powder like food ingredient, Calcium carbonate,
agricultural products like grains, seeds; resins, granules, carbon,
fertilizers, minerals, etc.
And it is the best for
packing concrete materials, cement.
CAN YOU PROVIDE US FORMULA OF VALVE BAG AND HOW TO FIND BOTTOM PATCH LENGTH ACCORDING TO BAG WIDTH
ReplyDeleteThank you for sharing this blog, Keep posting more and more like this useful, PP Sheet Manufacturers play a pivotal role in delivering high-quality polypropylene sheets that find diverse applications across industries. Their expertise in crafting durable, versatile, and eco-friendly PP sheets is commendable. These manufacturers invest in cutting-edge technology, ensuring top-notch products that meet various specifications and requirements. Whether for packaging, construction, or automotive needs, PP Sheet Manufacturers are a trusted source for premium materials, contributing to a sustainable and efficient future. Their commitment to quality and innovation continues to drive the industry forward.
ReplyDelete