kraft paper tote bag: Material Production & Core Performance Analysis

Have you noticed that whether it’s shopping in malls, giving gifts, or daily commuting, kraft paper tote bag always become the first choice due to their durability and excellent texture? But few people pay attention to the core material that supports their outstanding user experience—polypropylene (PP), which hides a lot of practical knowledge. As Shengcai Paper Packaging, a company specializing in custom gift boxes, we are particularly rigorous in selecting materials for kraft paper tote bag when matching them with gift packaging. Today, we will take you through their production principles, identification points, and core performance.

1. Core Material of kraft paper tote bag: Production Process of Polypropylene (PP)

Polypropylene is a polymer material prepared by polymerizing propylene as the monomer, gasoline as the solvent, under the action of a composite catalyst of formaldehyde and titanium trichloride, in a stable environment of 20 standard atmospheres and 50℃. Its English abbreviation is PP, and its trade name is often abbreviated as “C-Plastic”.

After years of optimization, this production process has now achieved efficient and environmentally friendly mass production. It not only controls costs but also optimizes material performance by adjusting reaction parameters. Therefore, it has become the mainstream choice for the inner lining and load-bearing base material of kraft paper tote bag, ensuring both the stiffness and practicality of the bag body.

2. Identification Characteristics of Polypropylene Material (Table Version)

3. Combustion Characteristics and Usage Notes of Polypropylene

Polypropylene is a flammable material that continues to burn even after leaving the fire source. During combustion, it releases a special odor, the top of the flame is yellow with a small amount of smoke, and the material melts and drips. This characteristic also reminds everyone that kraft paper tote bag should be kept away from open flames and high-temperature environments to avoid potential safety hazards.

4. Core Performance Q&A: Why is Polypropylene Suitable for kraft paper tote bag?

Q: What are the core advantages of polypropylene as a material for kraft paper tote bag?A: In the linear macromolecular structure of polypropylene, the three different arrangements of methyl side chains increase the crystallinity, making its performance more suitable for the usage scenarios of kraft paper tote bag:

1. Better chemical stability: Corrosion-resistant to most chemicals except fuming nitric acid and fuming sulfuric acid. The latest laboratory data shows that 80% sulfuric acid and concentrated hydrochloric acid will not damage polypropylene when in contact with it at 100℃ for a long time, and it is not afraid of slight stain erosion in daily use;
2. Excellent heat resistance: Can be used for a long time in an environment of 100-120℃. When exposed to the sun in summer or in contact with warm items briefly, kraft paper tote bag are not easy to deform;
3. Stronger barrier property: Permeability to air and water is much lower than that of polyethylene, which can better protect the items inside the bag, especially suitable for avoiding moisture when packaging gifts;
4. Better mechanical properties: Higher rigidity and tensile strength than polyethylene, stronger load-bearing capacity, and the folded part will not turn white after 1 million folds, making it not easy to break after repeated use.

Q: What material protection points should be noted when using kraft paper tote bag?A: There are two main points: First, the aging resistance of polypropylene is slightly inferior to that of polyethylene, and long-term exposure to the sun will accelerate aging, so it is recommended to avoid outdoor storage; second, long-term contact with copper will cause “copper damage”, so kraft paper tote bag should not hold copper items for a long time, and should also be kept away from copper products when stored.

5. Customization Advantages of Shengcai Paper Packaging

Shengcai Paper Packaging has been deeply engaged in custom gift boxes for many years, and we know that the practicality and texture of packaging are equally important. When providing customers with customized kraft paper tote bag matching gifts, we will adjust the thickness and process of the polypropylene base material according to the weight of the gift and the usage scenario, ensuring both load-bearing capacity and environmental protection and aesthetics. Whether it is holiday gift packaging or business souvenir supporting packaging, we can optimize the material to make kraft paper tote bag form a perfect match with gift boxes to meet personalized needs.

Choosing kraft paper tote bag is not only choosing a packaging but also choosing durability and peace of mind. If you need to customize gift boxes and supporting kraft paper tote bag, feel free to contact Shengcai Paper Packaging. We use professional material selection and customization services to add more texture to your gifts.