ナイカイ企業 List of Products and Services

"When we stacked the pallets, the bags were damaged." "After filling, when transported to the customer, they were torn." As we manufacture packaging containers, we cannot overlook this issue. The cause of the bags tearing is insufficient strength. The bags cannot withstand the weight of the contents. This problem can be resolved simply by changing the kraft paper. Increasing the basis weight of the kraft paper or switching to processed paper (cross kraft) will enhance its strength. [Countermeasures] ■ Increase the basis weight of the kraft paper to enhance strength Example: K75g/m2 → K78g/m2 ■ Changing the kraft paper to processed paper (cross kraft) will increase strength (Cross woven with PE or PP yarn laminated onto kraft paper) *For more details, please refer to the PDF document or feel free to contact us.

The sewing thread of the sewn paper bag is fraying! Have you ever experienced this when trying to fill the paper bag with contents or when attempting to transport and open the filled paper bag? The cause is that the crepe sewing part of the sewn paper bag can come into contact with or get caught on other objects during transportation or while working. If you continue working or transporting without noticing that the sewing thread is fraying, there is a risk that the contents could leak from that area in the worst-case scenario. By applying an over-tape process, you can solve the problem of fraying sewing threads. [Countermeasures] <Over-Tape Processing> ■ Covers and protects the sewing seams of the sewn paper bag ■ Prevents the sewing thread from coming undone at the ends ■ Since the sewing thread does not protrude externally, it prevents foreign matter from mixing in ■ It is also possible to prevent leakage of the contents *For more details, please refer to the PDF document or feel free to contact us.

There was a request to separate and use the paper bag (outer layer) and the PE film bag (inner layer). At Naikai Corporation, it is possible to manufacture paper bags that can be separated even during simultaneous bag production. The "Back-in-Back Bag" uses a special adhesive (release adhesive), allowing for easy separation and removal of the inner layer bag (such as PE film bags). This bag is suitable for applications requiring foreign matter contamination prevention, such as food ingredients, pharmaceutical materials, and even optical resin applications. 【Back-in-Back Bag Features】 ■ Uses a special adhesive (release adhesive) ■ Allows for easy separation and removal of the inner layer bag (such as PE film bags) ■ Adopts an easy-open feature ■ Reduces the introduction of foreign matter into clean rooms, etc. ■ Facilitates easy sorting when disposing of the bag *For more details, please refer to the PDF document or feel free to contact us.

There was a request to use a paper bag (outer layer) and a PE film bag (inner layer) separately. At Naikai Corporation, it is possible to manufacture paper bags that can be separated even during simultaneous bag production. The "Polyethylene Inner Layer Bag Insertion Bag" allows for the outer layer bag and inner layer bag to be separated and removed, making it suitable for food raw material applications and pharmaceutical raw material applications where contamination prevention is necessary. When sealing the filled contents, the PE bag, which is the inner layer, is tied with a rubber band or similar to seal it. 【Features of the Polyethylene Inner Layer Bag Insertion Bag】 ■ A paper bag with a longer PE bag inserted as the inner layer than the outer layer bag (kraft paper bag) ■ When sealing the filled contents, the PE bag, which is the inner layer, is tied with a rubber band or similar to seal it ■ The outer layer bag and inner layer bag can be separated and removed ■ Suitable for food raw material applications and pharmaceutical raw material applications where contamination prevention is necessary *For more details, please refer to the PDF document or feel free to contact us.

The information printed on the paper bag includes the product name, ingredients, precautions, legal markings, and other important details. If this information is not clearly visible, it could lead to troubles or accidents. Updating the design? That is one solution, but there are limitations to the printable area. As a countermeasure, let's try changing the type of ink used for printing. Each type of ink has its own characteristics, with advantages and disadvantages. If the ink printed on the paper bag is oil-based, how about switching to water-based ink? When changing from oil-based to water-based, there is no need to remake the printing plate. [Countermeasures] - Try changing the type of ink used for printing - Oil-based - Water-based - Organic solvent-based *For more details, please refer to the PDF document or feel free to contact us.

When you try to use it, the contents are damp and clumped together... The issue of the contents inside the bag becoming humid is troubling many customers. Craft paper has high moisture absorption due to its natural fibers, causing the paper bag to absorb moisture, which then permeates into the contents and makes them damp. As a countermeasure, by adding PE, AL, and WS to the inner layer, it is possible to enhance moisture resistance and protect the contents from humidity. Our company specializes in moisture-proof processing for the inner layers of sewing bags, bottom-sealed bags, and easy-open bags, particularly excelling in incorporating aluminum into bottom-sealed bags. [Countermeasures] - Moisture-proof processing for the inner layers of sewing bags, bottom-sealed bags, and easy-open bags - Use of PE (polyethylene) inner bags and sheets in the inner layer of the paper bag - Use of AL (aluminum) sheets in the inner layer of the paper bag - Use of WS (wet-strength paper) in the paper bag *For more details, please refer to the PDF materials or feel free to contact us.

When wearing gloves, it can be difficult to even pinch the sewing thread... Taking off the gloves just to open something is a hassle, and wearing gloves is essential for the task. However, it’s also frustrating when it takes a long time to open something. Our company offers the "Easy Open Bag" that can solve this problem. It has a cut tape on the opening, allowing you to simply pull the tape to open it. No scissors are needed, and it’s not a problem if you’re wearing gloves. Additionally, it doesn’t produce any thread debris from the sewing thread, which helps prevent foreign matter contamination. 【Countermeasures】 ■ Use the Easy Open Bag - Easy to open with cut tape, no problem even when wearing gloves - Just pull the cut tape, no scissors needed, increases efficiency - No thread debris from sewing thread, also helps prevent foreign matter contamination *For more details, please refer to the PDF document or feel free to contact us.

"The contents were filled into the bag, and just after stacking, the bag slipped and fell." "While transporting on a pallet with a truck, the bag slipped and fell." This is a common case reported by customers, and falls can lead to bag ruptures and potentially serious accidents. The cause of the bag slipping is that the paper fibers on the surface of the bag become flattened and smooth, resulting in a reduced coefficient of friction. Our company can apply anti-slip processing to both the front and back surfaces. By coating the base paper with an anti-slip agent, we can increase the coefficient of friction and make it less slippery. [Countermeasures] ■ Apply anti-slip agent to the base paper ■ Increase the coefficient of friction to reduce slipperiness *For more details, please refer to the PDF document or feel free to contact us.

Flexible containers and craft paper bags are essential items in the powder handling field. We have compiled the issues raised by customers during use and proposed solutions for them. 【Content (partial)】 ■ Overflow during filling ■ Inner bag misalignment during discharge ■ Foreign matter adhesion inside the container bag ■ Sewing thread of the sewn paper bag fraying ■ Desire to separate the outer layer bag from the inner layer bag *The materials can be viewed via PDF download.