How to choose industrial sewing machine for stitching synthetic slings - Nylon and Polyester (I)
Want to start your own manufacturing business of synthetic slings?
Need to expand your production capacity and improve seam quality?
What heavy duty industrial sewing machine would best meet your needs?
It is very
important to choose right industrial sewing equipment suitable for your
production. Please let your technicians or engineers read this guide carefully
before ordering machine.
Many end
users interchange nylon and polyester, there are differences in performance,
stretching, etc. but sewing polyester web slings is similar to nylon web
slings. Generally there are three type industrial sewing machines used in
manufacture of synthetic slings & straps made of Nylon, Polyester and
Polypropylene:
1. Plain industrial straight stitch sewing machine to sew the body of slings and slings eyes
2. Heavy duty programmable pattern sewing
machine for reinforced stitching slings and harness
Heavy duty pattern sewing machine for reinforcement stitch |
3. Heavy automatic Bar tacking machine to make sewn eye termination at end of ropes and cords
Automtaic Kernmantle Rope sewing machine to make sewn eye |
In Part (I),
we will guide you to select heavy duty plain sewing machine for
assembling synthetic lifting slings & cargo lashing straps (Ratchet Tie
Down).
(1) Thickness
of slings and straps
Nylon and
Polyester synthetic slings or straps can vary in thickness for different
applications. Here list the popular webbing slings sewing machines for
different thickness.
HIGHTEX # 72600: 2-7 mm thickness
HIGHTEX # 7373ECO: 4-14 mm thickness
HIGHTEX #7243: 4-14 mm thickness
HIGHTEX #7204:
4-18 mm thickness
HIGHTEX #7373BV: 8-20 mm thickness
HIGHTEX #733CS:
8-25 mm thickness(2) Width of slings and straps
Nylon and
Polyester synthetic slings or straps can vary in width. So you need to consider
under arm clearance (to the right of the needle)
HIGHTEX #72600---------------- 400 mm
HIGHTEX 7373ECO-------------420 mm
HIGHTEX
#7243-------------------- 420 mm
HIGHTEX
#7204--------------------320 mm
HIGHTEX
#7373BV-----------------420 mm
HIGHTEX
#733CS-------------------420 mm
(3) Thread size
Synthetic
web slings must be complied strictly with safety requirements. The quality
and size of sewing threads also determine safety and durability of the sewn
seams. Thus extremely thick thread always used in the production
of synthetic lifting slings and cargo lashing straps (Ratchet Tie Down).
You should consider both bobbin capacity (bigger bobbin reduce time of changing
bottom thread) and the max. sewing thread that machine can process:
Bobbin Size |
#72600 bobbin size: A=34.5/
B=12.3/C=15.1/D=9.5 Max. thread size 10: V277, T-270, 840dx3
#7373ECO
bobbin size: A=23.0/ B=26.5/ C=30.0/ D=9.0 Max. thread size 8: V415, T-400, 1300dx3
#7243 bobbin
size(mm): A=24.0/ B=25.5/ C=30.0/ D=7.5 Max. thread size 7: V415, T-400, 1300dx3
#7204 bobbin
size(mm): A=24.0/B=25.0/ C=30.5/ D=7.5 Max. thread size 7: V462, T-500, 1500dx3
#7373BV
bobbin size: A=23.0/ B=26.5/ C=30.0/ D=9.0 Max. thread size 8: V346, T-350, 1100dx3
#733CS bobbin
size (mm): A=32.0/
B=38.0/ C=44.1/ D=7.7 Max. thread size 4: V693, T-700, 2000dx3
The thread size must match up needle size. If you are to
sew webbing slings and straps with different size of thread, it is better
purchase different size of needles, together with machines.
(4) Feeding system of machine
Synthetic
web slings are difficult to sew, especially when stitch multiple layers of
webbing together, because they are tough, slipped, heavy, awkward and stiff.
Walking foot industrial sewing machine with reverse is almost necessary, the
drop feed (feed dog) and alternating (walking) presser foot feed synchronously,
keeping all layers of webbing even and smooth while sewing them together.
Triple-feed
is the most expensive sewing technology, most large slings and straps
manufacturers for serving high-end industrial markets are using triple feed
industrial sewing machines. Triple feed sewing machines have two alternating
presser feet which move the material by synchronizing the motion of the needle
bar, the inside presser foot and the bottom feed dog. While the material is
being moved (forward or reverse), the outside foot is lifted off the top of the
work. This allows the needle, inner foot and feed dog to easily transport all
of the layers together, until the preset stitch length is reached.
Triple feed is
not vital but it really helps when stitch multiple layers of synthetic web
slings together. It saves time and save spare piece. If budget allows, your
order should include at least one triple feed sewing machine.
HIGHTEX
#72600: walking foot machine
HIGHTEX
#7373ECO: walking foot machine
HIGHTEX
#7243: triple feed machine
HIGHTEX
#7204: triple feed machine
HIGHTEX
#7373BV: walking foot machine
HIGHTEX
#733CS: walking foot machine
(5)
Number of needle
In
the production of lifting slings & cargo lashing straps (Ratchet Tie Down),
single needle straight stitch sewing machine is the necessity. In order to
improve efficiency and obtain uniform stitch, some textile slings manufacturers
are using 728 class extra heavy duty double needle compound feed and walking
foot sewing machine to stitch both edges of sling & straps at same time. With
this machine, can operator can save 1/2 time, but please note this machine can
sew with max. 346 thread (1100d×3 or Tex size T-350), and the max. needle gauge
set (the distance between two needle) is 2 1/2" (63.5mm).
(6) Your sewing experience
HIGHTEX
series heavy duty industrial sewing machines are interchangeable with some
popular sewing equipment in this field, such as Durkopp Adler 204-370 and Juki
TNU-243. If you already worked with these slings sewing machines, you can
get the same equipment and spare parts from us. If you are a beginner, you
should take your skill level and max budget into consideration when you plan to
start your own production of synthetic lifting slings & cargo lashing
straps(Ratchet Tie Down).
(7) Optional sewing devices
Below
devices will help you achieve maximum productivity and optimum seam quality,
you can consider when purchasing sewing machine.
1. Automatic presser foot lift: presser foot lift by the switch on machine,
time-saving and labour-saving.
2. Automatic reverse stitch (back tacking): reverse feed controlled by the
switch on machine, save operator time and labour. Also great for reverse stitch
entirely slings and straps.
3. Needle cooler: when sewing thick synthetic web slings, the needle may
become hot and cause needle breakage & thread burn through, if you sew
fast. The needle cooling system can cool down the needle to prevent thread
break.
4. Speed reducer: for some extremely hard and stiff synthetic slings for
example high density polyethylene fibers, the sewing needle penetration force
probably not enough, the speed reducer can increase 3 times needle penetration
and great patching area.
5. Spare parts package: including all wear and tear parts such as shuttle
hook, needle plate, shuttle race, presser foot, thread tension etc.), the spare
parts package can support for 4-5 years, you do not need to purchase any parts
during this period.
Above are
basic points you need to consider before purchase heavy duty industrial sewing
machine, please feel free to contact us if you have any additional question or
concern!
Additionally if you do not have experience
with industrial sewing machine please, please specify, we will completely
assemble the machine (Ready to Sew), and deliver by large plywood case.
http://sewingtechnology.blogspot.com/2014/07/how-to-choose-heavy-duty-automatic.html
Selection of automatic bar tacking machines to make rope sewn eye termination:
http://sewingtechnology.blogspot.com/2014/07/how-to-choose-heavy-duty-bartacking.html
CowBoy (HIGHTEX) team
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删除I read your blog and i think your blog is very helpful for all slings machine user and buyers. 2 types of Webbing Slings are available in market. 1 Nylon and 2.Polyester
回复删除Thanks, we work closely with worldwide manufacturers of lifting slings, cargo straps, safety harness and safety ropes, got a lot of experience......You have experience with industrial sewing machine?
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