How Does Suntech Avoid the Wear of the Sword Head of the Rapier Loom?

 The rapier loom is a kind of shuttleless loom. It is a more general loom for weaving small and medium batches and frequently changed color fabrics. During the weft insertion process of the rapier loom, the weft is always actively controlled by the rapier. Resulting in fewer weft insertion errors and high reliability. In the production process, the rapier looms high-speed weft insertion, and the consumption of the rapier head and the rapier belt accounts for more than half of the total material consumption of the rapier loom. Effectively avoiding the abrasion of the rapier loom is very important to save production costs. Moreover, once the sword head is worn, it will cause weft insertion failure, and in severe cases, it will even cause a large number of warp yarn breakages, which will affect the quality of the cloth surface.

1. Causes of wear

Suntech Research Institute found that most of the sword head damage was caused by the impact of the weft feeding sword head and the weft receiving sword head during the work of the loom. This situation is due to the long-term wear and tear of the transmission device and the rapier belt to form a gap that leads to the movement of the sword head. The breakage of the sword head mostly occurs in the yarn blocking and holding parts of the sword head.

The wear of the sword head of the rapier loom is also very much related to the type of fabric. The wear of the sword head of different varieties is different, and the difference is quite large. For fabrics with thick yarns and high warp density, the sword head wears more severely and has a short service life. The service life of the sword head of chemical fiber products is shorter. This is because the sword head is rubbed back and forth on the chemical fiber warp to generate static electricity, which causes a layer of hardened substance to condense on the bottom of the sword head, which makes it easy to hang the warp.

The composition of the size used in the warp sizing also has a great influence on the wear of the sword head, and different size components have different effects on the wear of the sword head.

The technological structure of the rapier loom is also related to the wear of the sword head, especially the higher the height of the back beam and the greater the tension of the underlying warp yarn, the more serious the wear on the sword head. Because the tension of the lower warp yarn is high, when the shed gradually closes, the lower warp yarn will lift to increase the lifting force of the supporting sword head correspondingly. The greater the pressing friction force on the guide sword hook, the greater the wear on the sword head.

2. How to prevent wear and tear?

Suntech’s loom machine has made great improvements in the selection of sizing material, the height of the back beam of the loom, and the coating of the looming head. In the high-speed operation of ordinary rapier looms, the closeness of the time coordination between the rapier weft insertion movement and the warp shedding movement directly affects the wear of the rapier head. The warp opening time is too early, the weft feeding sword head has less contact with the warp yarn, and the warp yarn will be contacted more when the sword is retracted, so the sword head and the warp yarn friction and squeeze more; similarly, the warp yarn opening time is lagging, and the retracting sword contacts the warp yarn. There will be less, but there is more contact between the sword head and the warp yarn in the weft, so the friction and squeeze between the sword head and the warp yarn will be more at this time.

Therefore, Suntech chooses a slurry with less wear on the sword head, which can greatly extend the service life of the sword head. At the same time, further research on the coating technology of the sword head to enhance the wear resistance of the coating on the surface of the sword head is of great significance for prolonging the life of the sword head.

Suntech found that in the process structure of the loom, the height of the back beam is small, the wear on the sword head is small. However, it is worth noting that the proper elevation of the rear beam is beneficial to improve the quality of the cloth surface. Therefore, after a long period of practical research, Suntech has determined a reasonable height of the rear beam, which greatly reduces the wear of the sword head.

Finally, the coating quality of the sword head is of great significance to the use of the sword head. When the sword head enters and exits the shed formed by the warp yarn at high speed, the warp yarn generates alternating compressive stress on the surface of the sword head, causing fatigue wear and peeling of the coating. The flaking debris becomes abrasive grains with high hardness, which will cause abrasive wear to the sword head under the action of the warp yarn. Over time, the height difference between the substrate and the plating layer will form a cutting edge, which will cause the warp yarn to be cut and the machine will stop. For improvements in this area, Suntech is still studying to complete a breakthrough.

Zhejiang Strength Machinery Co., Ltd.

Michael Li

0086 13183015925



  • Machinery & Tools

Investment Scam: How to Avoid it

Palos Park, IL, 20 July 2021, ZEXPRWIRE, Investment scams have been running long before the advent of the internet. The term “Ponzi scheme” was coined in 1919 when Charles Ponzi started a postage stamp investment that collapsed with him owing investors the equivalent of $196 million in today’s money.

Bernie Madoff hit the headlines for the same reason in 2008 when Bernie L. Madoff Investment Securities LLC collapsed, owing investors $170 billion. Unlike Ponzi, Madoff initially ran the company with the best intentions, but greed and poor investment decisions led to him using new clients’ money to pay off old clients.

Regulators on both sides of the Atlantic have brought more restrictions on how legitimate firms can obtain business and trade. Following the economic collapse in 2008, many firms such as Morgan Stanley UK Ltd and Royal Bank of Scotland Plc were taken to task over their conduct, and a complete restructuring of the industry took place.

As a result, the UK finance industry is now one of the best and safest in the world. However, this has caused scammers to become more intelligent and more determined while driving rogue traders underground. Ironically, these traders act with impunity outside of regulated financial networks. However, these firms catch people by creating a veneer of legitimacy that only becomes transparent when it’s too late. Here are five red flags that indicate that an investment may be fraudulent:

The investment firm is evasive about its regulatory background:

In the UK, all firms undertaking financial business are regulated by the Financial Conduct Authority.

The FCA will have a list of all registered companies to undertake regulated activities, including offering investments for sale, so it’s a simple matter to ratify an investment firm’s credentials with the FCA. Any legitimate business will be happy to assist you when you undertake due diligence.

Scammers may pose as a “market introducer” for another investment to claim they are exempt from regulation, but this is a crucial indicator of a scam — there is simply no such thing.

Any offer of an investment on behalf of another is an act of brokerage, which is a regulated activity. If they’re not regulated, keep your money to yourself.

The investment has complicated international links:

Many legitimate firms will invest customers’ funds in markets abroad, but the investment will still be regulated in the UK.

However, unregulated and fraudulent operators use many foreign banks and organisations to circumvent UK regulation and launder ill-gotten money, so it cannot be traced back to its source. This means that the money will be difficult to recover if the investment is found to be fraudulent.

If everything seems unnecessarily complicated, the reason is to their benefit, not yours. Legitimate firms keep client money in a separate account in the UK even if they invest overseas, so never send your money abroad or deal with any firm that says they will.

It’s challenging to find details about the investment company:

Banks and legitimate financial institutions have a registered headquarters and registered directors. These details can be easily checked and verified, and these institutions will only be too happy to verify their legitimacy.

However, it’s pretty straightforward to set up a business with Companies House with a minimum of details, as there is no guarantee that the details of listed companies are correct.

Some fraudsters even clone legitimate, regulated financial institutions by setting up a business with a similar name. Similarly, the company directors named may not even be real people.

Once the scam has made enough money, these firms and their directors usually become physically non-existent, with the funds being laundered through an international network of associates.

Don’t rely solely on a listing with Companies House — dig deeper, and if you can’t find anything concrete, walk. The sketchier the details of the firm seem, the more likely it is to be a scam.

The investment is time-critical:

Any legitimate investment will plan to allow potential clients to consider their full range of options before investing. Any individual who rushes you into making a decision is doing to reduce the time you have to undertake due diligence.

Furthermore, the scammers will already be planning their great escape, so the sooner they get enough of the investors’ cash on board, the sooner they can dive underground without being traced by the authorities.

Anyone who uses high-pressure sales to get you to invest is probably a fraud. There’s no shortage of great investment opportunities out there, so take your own time.

If the investment seems too good to be true:

It probably is. Many sensible investors have ignored their misgivings in favor of the promise of huge returns. Be realistic: could any investment guarantee a ridiculously high return? The markets are the markets, and there are no “unicorn” investments, so treat big claims with scepticism.

Some investment schemes will pay the returns for a time, but they will be relying on new investments to keep the plan propped up. Even if you make the returns for some time, you will lose the bulk of your capital once the firm disappears.

Ponzi schemes are unsustainable, and their owners use investors’ money to fund their lavish lifestyle. You will always get out less than you put in.

If you’re looking to invest, remember: your money is safest in the bank. They may not pay the highest interest rates, but they will protect your money.

Regulated investment firms and banks are duty-bound to give you the best advice, outline risks versus benefits, and ensure your money is safely invested.

Your money is your own, and you should never be afraid to say no. If an investment firm is legitimate, they will respect your decision. If they don’t, that’s a sure sign that they should be avoided.