Tape containing recycled paper
A technology of pulp and crepe paper, applied in papermaking, paper coating, transportation and packaging, etc.
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example 1
[0039] Example 1 - Comparison of Paper Properties
[0040] Trials were conducted by paper suppliers to determine the level at which PCW pulp could be incorporated into crepe paper without adversely affecting the production process. It has been determined experimentally that up to about 50% by weight of PCW pulp, based on the dry weight of the paper, can be incorporated without adversely affecting equipment performance. However, a PCW content of 30% by weight (on a dry weight basis) was chosen to comply with labeling requirements while minimizing impact on batch tape production equipment and end product properties.
[0041] Crepe paper containing 30% by weight PCW pulp (on a dry paper weight basis) was obtained from a supplier and compared to a standard (non-PCW-containing) crepe paper control (referred to as Control 1). According to the standard method referenced in brackets, the following quality control indicators of unimpregnated paper were tested: basis weight (g / m2); t...
example 3
[0052] Example 3 - Fragmentation Properties
[0053] After successful completion of these preliminary tests, tape samples with a 30% by weight PCW backing prepared with various levels of impregnant loading were tested for chipping performance against a control tape prepared with a conventional backing paper (referred to as Control B). Compare. An acrylic latex dip was used. It was assumed that the impregnant loading would have an effect on the disintegration performance, therefore, a wider range of impregnant levels than in previous tests was tested. The properties of the test samples are reported in Table 2. The impregnating agent levels are reported on a dry paper weight basis.
[0054] Table 2: PCW-containing tapes and control tapes used for chipping tests
[0055]
[0056] The tapes were tested according to a 3M internal test method known as "Wallboard Testing". This test simulates the actual application of masking tape to the siding. This test procedure requi...
example 4-CD
[0059] Example 4-CD Tear Strength
[0060] Based on the results seen during the siding tests, additional tests were performed to determine the CD tear strength values of the impregnated papers corresponding to the Batch B1 and Control B samples described in Table 2. CD tear strength is known to correlate with chipping properties and can be measured by the standard TAPPI method.
[0061] As used herein, the term "CD tear strength" refers to the average result of the transverse direction tear test measured with an Elmendorf Tear Tester according to TAPPI method T414. TAPPI Test Method T496 (Specimen Preparation for Internal Tear Strength of Paper, Paperboard, and Related Materials) was used to prepare base paper samples.
[0062] In Table 3 and Figure 4 The CD tear strength results are summarized in .
[0063] Table 3: Summary of CD Tear Strength Results
[0064]
[0065] The tear results showed that the average CD tear strength difference between the control sampl...
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