阅读说明：本技术 用于收卷薄膜的软质纸芯和解决成品卷卷芯压印的方法 (Soft paper core for winding film and method for solving problem of core impression of finished roll ) 是由 王金廷 刘千涵 郭凤刚 于开东 于 2021-05-31 设计创作，主要内容包括：本发明涉及一种用于收卷薄膜的软质纸芯和解决成品卷卷芯压印的方法,方法为：在用于收卷薄膜的软质纸芯上粘上接头胶带,并将薄膜粘在接头胶带上,然后进行收卷得到成品卷；成品卷卷芯压印为5m以下；制得的一种用于收卷薄膜的软质纸芯,包括纸芯,纸芯的外周面复合一定厚度的软质材料；一定厚度大于单层接头胶带和单层薄膜的厚度之和；软质材料的邵氏硬度为5HC～70HC。本发明的一种用于收卷薄膜的软质纸芯,纸芯表面粘一层软质泡棉,可以完全解决薄膜成品卷卷芯压印问题；本发明的一种收卷薄膜的方法,收卷时,接膜处的凸起下沉到软质泡棉中,薄膜方向是平整的,收卷时就没有凸出痕迹,从而可以完全解决薄膜成品卷卷芯压印问题。(The invention relates to a soft paper core for rolling a film and a method for solving the problem of the coining of a finished product roll core, wherein the method comprises the following steps: adhering a joint adhesive tape on a soft paper core for winding a film, adhering the film on the joint adhesive tape, and then winding to obtain a finished product roll; the finished product roll core is stamped to be less than 5 m; the prepared soft paper core for rolling the film comprises a paper core, wherein a soft material with a certain thickness is compounded on the peripheral surface of the paper core; the certain thickness is larger than the sum of the thicknesses of the single-layer joint adhesive tape and the single-layer film; the Shore hardness of the soft material is 5 HC-70 HC. According to the soft paper core for winding the film, the surface of the paper core is adhered with a layer of soft foam, so that the problem of core impression of a finished film roll can be completely solved; according to the method for rolling the film, disclosed by the invention, when the film is rolled, the bulge at the film joint sinks into the soft foam, the direction of the film is flat, and no convex mark exists when the film is rolled, so that the problem of embossing of a finished film roll core can be completely solved.)

1. A soft refill for rolling film, characterized by: the periphery of the paper core is compounded with a soft material with a certain thickness; the certain thickness is greater than the sum of the thicknesses of the single-layer joint adhesive tape and the single-layer film; the Shore hardness of the soft material is 5 HC-70 HC.

2. The soft paper core for rolling the thin film as claimed in claim 1, wherein the thickness is 0< thickness <10 mm.

3. The soft paper core for rolling up thin films as claimed in claim 1, wherein the paper core is made of paper or ABS material.

4. The soft paper core for rolling the thin film as claimed in claim 1, wherein the soft material is foam or sponge.

5. The soft paper core for rolling the thin film as claimed in claim 1, wherein the soft material is PE or PU.

6. The method for solving the problem of the embossing of the finished roll core by adopting the soft paper core for rolling the thin film as claimed in any one of claims 1 to 5 is characterized in that: adhering a joint adhesive tape on the soft paper core for rolling the film, adhering the film on the joint adhesive tape, and rolling to obtain a finished product roll; the finished roll core is embossed to be less than 5 m.

7. The method of claim 6, wherein said tab tape is double sided tape; the film is BOPET.

8. The method of claim 7, wherein the tab tape has a thickness of less than 70 μm.

9. The method for solving the problem of the embossing of the finished roll core as claimed in claim 8, wherein the rolling speed is 50m/min to 400m/min, the rolling tension is 200N/m to 350N/m, and the rolling pressure is 250N/m to 500N/m.

10. The method for solving the core impression of the finished roll according to claim 9, wherein the finished roll obtained after rolling is completely free of core impression.

Technical Field

The invention belongs to the technical field of paper cores for films, and relates to a soft paper core for winding a film and a method for solving the problem of core impression of a finished roll.

Background

Before the film is wound, the film is adhered to the paper core by using the double-sided adhesive tape, as shown in fig. 1, a protrusion is formed at the adhered position due to the accumulated thickness of the film and the double-sided adhesive tape, so that the roll core of the finished product is stamped, and the product quality is affected.

In order to solve the problem of stamping of the finished product roll core, the proposal in the prior art is as follows: firstly, choose thinner double faced adhesive tape for use, reduce the mode that membrane joint department arch height alleviates this problem. And secondly, adhesive tapes with different thicknesses are adhered along the film joint to form an inclined surface transition mode to reduce the impression problem of the finished product winding core.

However, in the above prior art, when a thinner double-sided adhesive is selected, although the double-sided adhesive becomes thinner, the thickness accumulation of the film and the double-sided adhesive still affects the flatness of the finished product roll core, and only the imprint of the finished product roll core can be reduced, which cannot be fundamentally solved. The adhesive tapes with different thicknesses are adhered along the film joint to form an inclined plane transition mode, so that the inclined plane cannot make linear transition due to the films with various thicknesses, and therefore, the impression of the finished product roll core can be reduced, and the stop cannot be avoided.

Therefore, it is very important to research a paper core for a film, which can completely prevent the finished roll core from being imprinted.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a soft paper core for rolling a film and a method for solving the problem of core coining of a finished roll;

in order to achieve the purpose, the invention adopts the following scheme:

a soft paper core for rolling a film comprises a paper core, wherein a soft material with a certain thickness is compounded on the peripheral surface (the whole) of the paper core; the certain thickness is greater than the sum of the thicknesses of the joint tape and the film; the hardness of the soft material is 5 HC-70 HC (measured by Shore hardness tester). When the hardness is too low, the soft material is too soft, the whole roll core of the finished product is sunken, and the situations of end surface star shape, corrugation and the like are easy to occur; when the hardness is too high, the soft material is too hard, the joint of the finished product winding core cannot be well embedded into the soft material, and the problem of stamping of the finished product winding core cannot be thoroughly solved.

As a preferred technical scheme:

the soft paper core for rolling the thin film is 0-10 mm in certain thickness.

As mentioned above, the soft paper core for rolling the thin film is made of foam or sponge, if the soft material is not properly selected, the joint of the film roll can not be completely sunk into the soft material, and the problem of stamping of the finished roll core can still occur.

The soft paper core for rolling the film is made of PE (polyethylene) or PU (polyurethane).

The invention also provides a method for solving the problem of core impression of a finished product roll by adopting the soft paper core rolling film for rolling the film, wherein a joint adhesive tape is stuck on the soft paper core for rolling the film, the film is stuck on the joint adhesive tape, and then the film is rolled to obtain a finished product roll; the finished roll core is embossed to be less than 5 m.

As a preferred technical scheme:

according to the method for solving the problem of stamping of the finished roll core, the joint adhesive tape is double-sided adhesive tape or solid adhesive tape; the film is BOPET (biaxially oriented polyester film).

The method for solving the problem of embossing the finished roll core as described above, the thickness of the splicing tape is less than 70 μm.

According to the method for solving the impression of the finished product roll core, when the finished product roll core is rolled, the rolling speed is 50 m/min-400 m/min, the rolling tension is 200N/m-350N/m, the rolling pressure is 250N/m-500N/m, the finished product roll rolled by using the common paper core has the impression of the roll core of 50 m-100 m, however, when the soft paper core designed by the scheme is used, the impression of the finished product roll core can be reduced to below 5m by using the same production process when the product with the same specification is produced, and the purpose of eliminating the impression of the finished product roll core is achieved by optimizing the production process. The rolling speed, the rolling pressure and the tension are properly reduced according to the rolling condition, and the purpose of eliminating the coining of the finished product roll core can be achieved. For example: BOPET (biaxially oriented polyester film), when the film thickness is 75 μm, the winding speed is 250m/min, the winding tension is 230N/m, and the winding pressure is 270N/m. If the tension and the pressure are too large, the end faces are easy to be star-shaped, wrinkled and the like.

According to the method for solving the core impression of the finished roll, the finished roll obtained after rolling is completely free of core impression, and the finished roll is free of scratches, salient points, static impression (pock), broken holes, corona-free liquid drops, oil stains, mosquitoes, burrs, uneven thickness, lip lines, ribs, longitudinal wrinkles, bubbles (watermarks), uneven end surfaces, star-shaped end surfaces, warped edges, chromatic aberration, insufficient length, indentation, impurities, joints, orange peel marks, crystal points and white spots.

The principle of the invention is as follows:

the finished product roll core impression is caused by the bulge at the film connecting position, and specifically comprises the following steps: if the protrusions are raised toward the film, the film is deformed; the embossing of the finished roll core is caused by the thickness accumulation at the double-sided adhesive film joint to form a bulge, and the surface of the paper core is very hard, so that the bulge extends to the side of the film when the paper core is wound, and the film is deformed. According to the invention, a circle of soft foam cotton with a specific thickness is adhered to the surface of the common paper core, so that the surface hardness of the paper core is reduced, the paper core can extend towards the paper core when a bulge exists, and the surface of the film is flat, so that the paper core is rolled flatly without finished product roll core impression. The use process of the soft paper core for rolling the film is the same as that of a common paper core, a layer of glue is firstly adhered on the soft material, then the film is adhered, when the film starts to be rolled, the bulge at the adhering part can sink into the soft material under the action of tension and pressure of the press roller, and the surface of the film is flat, so that the problem of impression of the finished film rolling core is solved.

Advantageous effects

(1) According to the soft paper core for winding the film, the surface of the paper core is adhered with a layer of soft foam, so that the problem of core impression of a finished film roll can be completely solved;

(2) according to the method for rolling the film, disclosed by the invention, when the film is rolled, the bulge at the film joint sinks into the soft foam, the direction of the film is flat, and no convex mark exists when the film is rolled, so that the problem of embossing of a finished film roll core can be completely solved.

Drawings

FIG. 1 is a prior art paper core for winding a film;

FIG. 2 is a paper core for winding a film according to the present invention;

wherein, 1-double faced adhesive tape, 2-paper core, 3-BOPET and 4-soft material.

Detailed Description

The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

Example 1A

A soft paper core for rolling a film comprises a paper core made of paper;

the outer peripheral surface of the paper core is compounded with PE foam; the thickness of the foam is 1.1 mm; the shore hardness of the foam is 5 HC.

Example 2A

A soft paper core for rolling a film comprises a paper core of paper;

the outer peripheral surface of the paper core is compounded with PE foam; the thickness of the sponge is 1.0 mm; the Shore hardness of the foam is 10 HC.

Example 3A

A soft paper core for rolling a film comprises a paper core made of ABS material;

the outer peripheral surface of the paper core is compounded with PE foam; the thickness of the foam is 0.9 mm; the Shore hardness of the foam is 30 HC.

Example 4A

A soft paper core for rolling a film comprises a paper core made of ABS material;

the outer peripheral surface of the paper core is compounded with PU foam; the thickness of the sponge is 0.8 mm; the Shore hardness of the foam is 50 HC.

Example 5A

A soft paper core for rolling a film comprises a paper core made of paper materials;

the outer peripheral surface of the paper core is compounded with PU foam; the thickness of the foam is 0.7 mm; the shore hardness of the foam is 70 HC.

Example 1B

The method for solving the problem of the embossing of the finished roll core by adopting the soft paper core for rolling the film in the embodiment 1A (as shown in fig. 2, the soft material 4 compounded on the outer peripheral surface of the paper core 2 is foam made of PE) comprises the following specific steps:

adhering a double-sided adhesive tape 1 with the thickness of 30 mu m to a soft paper core for rolling a thin film, adhering BOPET3 with the thickness of 150 mu m to the double-sided adhesive tape 1, and rolling to obtain a finished product roll completely without core impression;

when in winding, the winding speed is 260m/min, the winding tension is 220N/m, and the winding pressure is 270N/m.

Example 2B

The method for solving the problem of the embossing of the finished roll core by adopting the soft paper core for rolling the film in the embodiment 2A comprises the following specific steps:

adhering a double-sided adhesive tape with the thickness of 30 mu m on a soft paper core for rolling a thin film, adhering BOPET with the thickness of 150 mu m on the double-sided adhesive, and rolling to obtain a finished product roll without roll core imprinting;

when in winding, the winding speed is 260m/min, the winding tension is 230N/m, and the winding pressure is 280N/m.

Example 3B

The method for solving the problem of the embossing of the finished roll core by adopting the soft paper core for rolling the film in the embodiment 3A comprises the following specific steps:

adhering a double-sided adhesive tape with the thickness of 30 mu m on a soft paper core for rolling a thin film, adhering BOPET with the thickness of 150 mu m on the double-sided adhesive, and rolling to obtain a finished product roll without roll core imprinting;

when in winding, the winding speed is 260m/min, the winding tension is 240N/m, and the winding pressure is 300N/m.

Example 4B

The method for solving the problem of the embossing of the finished roll core by adopting the soft paper core for rolling the film in the embodiment 4A comprises the following specific steps:

adhering a double-sided adhesive tape with the thickness of 30 mu m on a soft paper core for rolling a thin film, adhering BOPET with the thickness of 150 mu m on the double-sided adhesive, and rolling to obtain a finished product roll with a roll core pressed and printed to be 2 m;

when in winding, the winding speed is 260m/min, the winding tension is 250N/m, and the winding pressure is 350N/m.

Example 5B

The method for solving the problem of the embossing of the finished roll core by adopting the soft paper core for rolling the film in the embodiment 5A comprises the following specific steps:

adhering a double-sided adhesive tape with the thickness of 30 mu m on a soft paper core for rolling a thin film, adhering BOPET with the thickness of 150 mu m on the double-sided adhesive, and rolling to obtain a finished product roll with a roll core imprinted to be 4 m;

when in winding, the winding speed is 260m/min, the winding tension is 270N/m, and the winding pressure is 450N/m.