Most plastic bags are heat sealed together. Some are bonded with adhesives or are stitched.

Several design options and features are available. Some bags have gussets to allow a higher volume of contents. Some have the ability to stand up on a shelf or a refrigerator. Some have easy-opening or reclosable options. Handles are cut into or added onto some.

Bag-In-Box packaging is often used for liquids such as wine and institutional sizes of other liquids.

Plastic bags usually use less material than comparable boxes, cartons, or jars, thus are often considered as “reduced or minimized packaging”.Depending on the construction, plastic bags can be well suited for plastic recycling. They can be incinerated in appropriate facilities for waste-to-energy conversion. They are stable and benign in sanitary landfills. If disposed of improperly, however, plastic bags can create unsightly litter and harm some types of wildlife.

Bags are also made with carrying handles, hanging holes, tape attachments, security features, etc. Some bags have provisions for easy and controlled opening. Reclosable features, including press-to-seal zipper strips such as Ziploc, are common for kitchen bags. Some bags are sealed and can only be opened by destroying the packaging, providing some tamper-evident capability.

Bags can be made with a variety of plastics films. Polyethylene (LDPE, LLDPE etc) is the most common. Other forms, including laminates and coextrusions can be used when the physical properties are needed.

Open bags with carrying handles are used in large numbers worldwide. Stores often provide them as a convenience to shoppers. Some stores charge a nominal fee for a bag. Heavy-duty reusable shopping bags are often considered environmentally better than single-use paper or plastic shopping bags.

According to the survey of plastic bag research, nowadays, plastic bags which can be bought by people at supermarket and road are mostly the cheapest ones which can be used for only one time. In order to lower cost, they are not disinfected, so they contain a lot of talcum powder, if we use this kind of bags for a long time, especially use them to contain hot food, they may cause the bad condition of health, and that equals chronic poisoning.

The following ones are the harm of plastic bags, disposable plastic bags contain all kinds of virus, bacteria and carcinogens, because plastic bags contain talcum powder, so if we use plastic bags to pack food for a long time, we will eat a long of talcum powder, and that will cause calcium deposition in body.

Disposable plastic bags pollute environment fiercely, the specific influence is as followed, it will take two hundred years for decaying plastic bags, so it will pollute soil for a long time. But if we burn these bags into ashtray, it will produce poisonous dust and gas, which will pollute the environment for decades. Degradable plastic is hard to degrade, the degradable plastic which we can usually see in market is added starch into it, after it is used and buried, starch will turn sour, bacteria will degrade, big bags will be degraded into small pieces, which can hardly be seen by eyes. Plastic bags will influence the normal breath of soil, plastic bag is not the basic ingredient of soil, if it is abandoned into soil, it will influence grow of plant. We should avoid using plastic bag to pack hot food, according to introduction, plastic bags which we use now contain polyester, polyethylene, polypropylene and so on.

 A lot of restaurants use plastic bags which are made of PVC, and it can’t be used to pack food, if we use it for a long time, it will cause bad health condition. According to health experts’ suggestion, we should decrease using disposable plastic bags for our health and environment, and we can use basket and clothe bag instead.

Need a little extra pluck for your thrifty crafts? There’s nothing like a plastic chicken to start off a conversation about saving money through the art of reuse. Photo: WOW Imports
Placemats – How cute are these crocheted placemats from CreativeJewishMom.com? Follow her easy, step-by-step instructions for turning your plain grocery sacks into a kitschy addition to your table.
Rugs and sleeping mats – Tried a placemat and ready to go bigger? Create your own, multi-colored floormat from recycled plastic bags. Or, if you’re feeling philanthropic, expand your floormat project to a sleeping mat that can be donated to a local homeless shelter. We love this project from a church in Illinois and this blanket project by a school in Florida as examples.
Furniture – Check out Ryan Frank’s rad illustration of how plastic bags can be reused in a more durable fashion, such as a chair. This may definitely be one of our most time-consuming projects, but if you’ve got the desire, it’s well worth trying!
Flowers – They may look lovely and fresh, but these flowers don’t need any watering. Check out Sustainlane’s how-to on transforming plastic bags into fresh flora.
A Chicken – We just love this fun reuse craft from South Africa, which made it into our 2008 Gift Guide. You can definitely try your own hand and save a few bucks, or purchase this chicken to support a local group in Cape Town.

Traveling – Avoid using the dry cleaning or laundry service at your hotel by wrapping bottles of shampoo, lotion and the like in an old bag. This is also an easy trick for dirty shoes or any other item in your suitcase with the potential to ruin your silk skirt or fancy tie en route to the next big meeting or family vacation.
Trash can liners – This may seem like a no-brainer, but why buy small plastic bags to line your wastebaskets in your bathroom or home office, when you’re already bringing home grocery bags that fit these smaller bins? Don’t spend money on a redundant product and prevent the need to manufacture more bags as well with this simple idea.
Packing materials – Whether you’re shipping a box to your Great Aunt Dede or simply putting an old purse or pair of shoes in storage, plastic bags offer an easy-to-use material to keep your items safe and in working order. Simply ball them up to use as cushion or filler as needed. The savings? Keeping your items pristine, of course!
Reuse it – Literally. Since a typical plastic bag weighs approximately 4 to 5 grams and can hold up to 17 pounds of product – nearly 2,000 times its own weight – they are perfect for multiple uses as a carrying device. Pack your lunch or use them to bring home groceries a few times before recycling them (see section #4). If you’re concerned about the environmental impact of reusable bags, which are typically non-recyclable, this is a great way to avoid spending extra cash on those measures.

With a Plastic Coil Binder, you can choose between a manual punch or electric punch operation. The advantage with an electric punch is that it operates faster than the manual punch.

The Electric Punch and Coil Inserting Combo system is foot pedal operated and very efficient to use. If you’re on a tight schedule and have a high volume, you are better off buying this machine.

Signs in Wal-Mart stores in the California cities of Folsom and Citrus Heights had announced that shoppers would soon have to either bring their own bags or buy reusable ones _ for 15 cents.

The two stores, along with a third in Ukiah, Calif., make up a small test program. Going plastic-bag-free is one of a variety of strategies being tried at stores around the world as Wal-Mart evaluates ways to meet its goal of cutting plastic bag waste 33 percent by 2013.

Wal-Mart spokeswoman Amelia Neufeld said the company decided that launching the reusable bag-only program just before the holiday shopping season would skew the test results.

“The goal of this test is to gauge customer reaction. We think we’ll get a more accurate reaction by offering these bags after the holidays,” she said.

Neufeld would not comment on whether recent customer reactions had driven the decision to postpone the test.

At the Folsom store earlier this week, customers interviewed by McClatchy Newspapers were roughly split on the plan.

Matthew Oliver, a Folsom resident who complained in writing at his local store after learning of the plan, said a Wal-Mart representative called him Wednesday to say the Sunday launch of the test program had been called off.

Oliver said he resented the reusable bag program because he felt it was a cost-cutting measure with a green veneer that deprived him of the right to choose how he’d like to carry his purchases.

“I just want to buy my milk from you,” he said. “I don’t want you to tell me what my political views ought to be.”

Wal-Mart is also evaluating other strategies for reducing plastic waste that don’t involve removing free plastic bags from stores altogether. It is retraining some checkers to put more items in each sack, for instance, and is considering switching to thinner bags that contain less plastic.

The company’s 15-cent reusable bags will continue to be offered at the checkout counters, Neufeld said. They are royal blue and made of a lightweight, recyclable polypropylene fabric.

Only the exact same types of plastic can be welded together. If different types of plastic are used they will not produce a strong joint and will not hold.

Use a level, clean, insulated, well ventilated work area. Since weld temperatures are not extremely high, a sturdy piece of cardboard or ironing board cover can be used to insulate the work surface.

Welding plastic in the simplest terms is melting the edges of plastic and joining them together. There are several different heat sources which can be used to weld plastic. Many of them are already in your home.

A non-stick household iron is an excellent heat source for welding plastic. Prepare the plastic by washing with a soap made to remove grease. Rough the edges of the plastic, unless it is a very thin plastic like the type that would be used for a shower curtain or a garment bag. Make sure the steam setting is off. Set iron on the highest synthetic setting. Melt the edges and fuse together. A piece of wax paper can be put in between the iron and the plastic to keep it from sticking.

A hot plate is also another excellent heat source for plastics welding. Use a hot plate with a non-stick smooth surface. Prepare the plastic by washing and roughing up, melt edges and hold together until fused. Plastic cools very quickly so holding it together work just as well as a vice or clamps.

A simple metal rod can also be used. Heat the metal rod over the flame of your stove and use the end of the rod to melt the plastics’ edges, hold together to fuse. Never allow the plastic to come in direct contact with the flame.

Larger more complex plastic welding is done with a hot air or gas welding gun. Used when welding plastic piping.

these are the yellow rolls that feed the circular weaving machine to make our seamless plastic bags.

for the first time i got to know how seamless bags are woven. the principle is as simple as explained in secondary school lessons.

i actually planned to do an installation with blue, white & yellow (plastic)threads in the campus using wind as basic stimulator but the client had his own plans…

With a history dating back to 1956, Zhejiang Sound Machinery Manufacture Co., Ltd., one of the earliest manufacturers of plastic injection molding machine, is a key enterprise of Zhejiang Province. Covering total area 100, 000 m2, our main workshop with 12, 000 m2 are can be engaged in the installation of our whole series plastic injection molding machine up to 38, 000 KN clamping force. Our FT series injection molding machine, which clamping force is from 400 KN to 38, 000 KN, the theoretical shot volume is from 60 cubic meters to 80, 000 cubic meters and the FJ series extruding injection machine that famous as its larger volume have been well sold in the whole China and exported to 25 countries and regions such as Japan, France, Saudi Arabia and Indonesia. We have accredited to ISO 9001, CE in earlier time, and our products are superior in their qualities, have been awarded the State Sliver Medal that is the sole highest prize in the domestic plastics machine field. At present, we are one of the strongest, largest and first-class level enterprises of our trade in China.

Product Description

Injects Partially
Screw Model Mm: 180
Screw L/D Ratio L/D: 33.1
Injection Pressure Mpa: 80
The Oretical Shot Volume Cm3 /S: 15000
Shot Weight(Ps) G: 10000
Injection Rate Cm3 /S: 1300
Plasticizing Capacity(Hdpe) G/S: 60
Screw Speed G/S: 20-80
Stroke R/Min: 590

Locks The Mold Is Partial
Clamping Model. Turnin Doubletoggle
Clamping Force Kn: 5800
Max. Daylight Mm: 1650
Max. Mould Plate Stroke Mm: 830
Mould Thickness Mm: 300-820
Space Between Tie Bars Mm: 830*830
Mould Plates Size Mm: 1240*1240
Ejector Style. Hydraulic(17 Point)
Ejector Force/Stroke Kn/Mm: 125/250

Electricity Motor Power Kw: 55.5
Heating Power Kw: 45

Other Parts
Max. Pump Pressure Mpa: 16
Hydraulic Tank Capacity L: 1280
Machine Weight Ton: 31
Machine Size(Lxwxh) M: 10.5*2.5*2.5